Seals

In sealing systems, X-rings, often called star-shaped seals, are instantly recognizable for their four-lip cross-section: their cross-section resembles a distinct "X." They can be installed in specialized, low-compression grooves to reduce friction, or they can directly utilize the AS568A standard O-ring groove and dimensions, effectively replacing O-rings in most applications without significantly modifying the hardware structure. Definition and Mechanism ·Structural Features: They have an X-shaped cross-section and four lips acting on the sealing surfaces. After pre-compression, they establish contact stress in the radial and axial directions. Higher system pressures increase the sealing force, making them a "pressure-energized" seal. ·Operating Condition Compatibility: They can be used for both static sealing and reciprocating and rotating applications. The four lips provide greater stability in dynamic conditions, resist rolling or twisting, reduce starting resistance, and facilitate lubrication development and retention. · Materials and Temperature: Common materials include nitrile rubber (NBR) and fluororubber (FKM), with a typical operating temperature range of -40°C to +250°C. Applicable media include hydraulic oil, water, and gas. · Interchangeability and Grooves: Standard dimensions align with American Standard AS568A O-rings, allowing direct use of O-ring grooves of the same specification. To further reduce friction and wear, a dedicated X-shaped seal groove with a lower compression ratio can also be used. Differences and Advantages Compared to O-rings · Lower Friction and Starting Resistance: The "lubrication cavity" between the sealing lips facilitates oil film formation, resulting in easier starting and slower wear. · Torsion Resistance and Stability: The non-circular cross-section suppresses rolling and torsion during reciprocating motion, reducing premature leakage caused by instability. · Optimized Sealing Details: The flash edge is located in the concave portion of the cross-section, which more easily focuses contact pressure on the effective sealing area, improving sealing reliability. Number of contact lines: Four contact lines, compared to two for an O-ring, provide more ample sealing contact and compressive stress distribution. High-pressure capability: With appropriate groove, tolerance, and support configurations, high-pressure operating conditions can reach 60 MPa. For extreme pressures or large gaps, it is recommended to consider the stiffness of both the retaining ring and the mating component. Groove and Selection Key Points Universal Installation: The O-ring groove can be directly used. For lower friction and longer life, a dedicated X-shaped seal groove is recommended (which offers a milder compression rate, lower dynamic friction, and heat generation). Dimensional Recommendations: For static seals (for holes): The matching difference between the seal ring inner diameter and the groove outer diameter should be controlled within approximately 2% to achieve appropriate interference fit and preload. For rotary seals (for shafts): The seal ring inner diameter is typically approximately 2–5% larger than the shaft diameter to account for thermal expansion, frictional heat generation, and lubricant film stability. · Dynamically Prefer Thicker Sections: For dynamic applications such as reciprocating and rotating, thicker sections are preferred for more controllable compression set, greater wear resistance, and greater sealing margin. Smaller sections are also suitable for static sealing. · Operating Condition Review: The selection process should comprehensively consider temperature (peak and continuous), pressure (including pulsation), media, motion type, and cycle. For rotating applications, the temperature rise and heat dissipation capacity caused by frictional heat should also be evaluated. Material and Operating Condition Matching · Nitrile (NBR): Compatible with most mineral-based hydraulic fluids and greases, it offers a balance of low-temperature performance and wear resistance, making it a "basic" for hydraulics and general machinery. · Fluorocarbon (FKM): Demonstrates stronger adaptability to higher temperatures and a variety of chemical media, making it suitable for oil and gas, chemical, powertrain, and some energy equipment. · Hardness and Formulation: Commonly found in the 70–90 Shore A range; higher hardness improves pressure resistance and extrusion resistance, but a balance must be struck between assembly requirements and low-temperature flexibility. · Pressure and Clearance: For high-pressure or large radial clearance applications, retaining rings/stops are recommended. The roughness and hardness of the sealing surface also directly affect the lifespan and leakage level. Application Scenarios and Audience · Pumps and Hydraulic Systems: For both reciprocating and rotary sealing, star-shaped seals offer reliable performance in shaft seals and plunger/piston rod applications. · Motors, Gearboxes, and Engines: They balance lubricant retention and torsion resistance, making them suitable for auxiliary oil seals at shaft ends and end caps. · Industrial Machinery and Robotics: Comprehensive sealing solutions for reciprocating actuators, rotary joints, and reducer interfaces. · Construction Machinery and Energy Equipment: Ensures seal reliability and lifespan management under high loads and pulsating pressures. · Wind Power, Metallurgy, Chemical Engineering, Water Treatment, and Shipbuilding/Rail Transit/Automobile (including heavy-duty trucks): These seals cover a wide range of applications, from static sealing flanges to dynamic bearings. If your system needs to reduce friction and starting resistance, inhibit torsion and extrusion, and maintain high compatibility with existing AS568A structures, a star seal (X-ring) is a good choice. Provide key operating conditions (temperature/pressure/media/motion type/clearance), and DEDE can quickly provide recommendations for selecting and sampling the X-ring series.

Minimum Order: 1000

There’s a small moment in every hydraulic system where things either stay orderly or begin to drift: first motion, first heat, first uneven contact. An x ring, also called a quad ring, is purpose‑built for those moments. It shares nominal sizes with AS568A O‑rings, drops into the same glands when needed, and in dedicated low‑squeeze grooves it further trims friction. Its X‑shaped profile creates four sealing lips and two micro‑lubrication pockets between them, so films stabilize, start‑up is cleaner, and the seal is less prone to roll in reciprocating motion. How the profile works · Pre‑compression plus pressure: Initial squeeze produces radial/axial contact stress; system pressure adds to it, so sealing force scales with load and remains bidirectional in both static and dynamic duties. · Four lines of defense: The X profile spreads load across four contact lines, lowering the chance of torsional twist and reducing spiral failure compared with round‑section O‑rings. · Friction under control: Lip cavities retain lubricant; starting friction drops, running friction is more stable, and heat generation is easier to manage. Operating window and materials Media and temperature: With compounds such as NBR for oils, FKM for higher temperature and broader media, EPDM for water‑lean chemistries, VMQ for wide temperature windows. · Pressure and speed: With appropriate clearances and back‑ups, x rings can be engineered for high‑pressure environments up to roughly 40 MPa. As sliding speed rises, pay close attention to lubrication film stability and heat dissipation; in rotary duties, account explicitly for temperature rise from friction. · Static and dynamic: The profile is at home in reciprocating, oscillating, and low‑speed rotary sealing, while also delivering dependable static sealing on flanges, covers, sleeves, and pipe joints. Sizing and gland guidance · Interchangeability with O‑rings: AS568A dimensional parity allows direct substitution in many O‑ring glands, making trials and phased roll‑outs simpler. · Dynamic preference for thicker sections: In motion, thicker cross‑sections better handle wear, improve compression‑set behavior, and tolerate larger movement gaps; under higher pressure, add back‑up rings and tighten extrusion gaps. · Rotary allowances and static fits: For rotary shafts, choosing an ID about 2–5% larger than the shaft helps balance running‑in and thermal rise. For static bore interfaces, keep the ring‑to‑gland dimensional deviation within a small window (around 2%) to maintain uniform squeeze without over‑compression. · Surface and finish: Use compatible lubricants and moderate surface roughness to preserve films, limit wear, and prevent micro‑leak paths at edges. Why engineers choose x rings over O‑rings in many cases · Lower friction, cleaner starts: Lubrication pockets and multiple contact lines reduce both running and breakaway friction. · Less twist in sliding service: The non‑circular section resists rolling in reciprocation, helping prevent premature leak paths. · Higher efficiency per footprint: Four contact lines provide greater sealing stability within the same gland envelope. · Extrusion resistance: Distributed load and better hardware support reduce extrusion risk at elevated pressures. · Versatility: Works in standard O‑ring grooves and in special low‑squeeze glands designed for reduced heat and wear. Where the x ring series fits best · Hydraulics and pneumatics: cylinders, actuators, manifolds · Construction and agriculture: boom/steering cylinders, clamping and tooling · Energy and wind power: pitch and yaw hydraulic modules · Pumps and motors: end‑faces and low‑speed shaft positions · Gearboxes and engines: auxiliary seals and test tooling · Metallurgy and water treatment: high‑load reciprocating interfaces · Industrial automation and robotics: joints, clamps, and fixture systems · Chemical and petrochemical: valve actuators, metering, and test rigs · Transportation sectors: marine and offshore equipment, rail vehicles, automotive and heavy‑duty trucks (subject to material and compliance validation) A practical note to close: when you align geometry, compound, and lubrication— and confirm it with staged pressure and thermal cycling—the x ring series tends to fade into the background of your system. That’s a compliment. Reliable seals don’t ask for attention; they give you uptime, predictable maintenance, and room to focus on the work that matters.

Minimum Order: 500

Quiet parts tend to tell the loudest truths about equipment health. The o ring series seals out ambiguity across pumps, motors, hydraulic manifolds, and robotic actuators—defining whether systems hold pressure, resist media, and endure heat cycles. DEDE leverages decades of expertise from compound formulation to groove fit, enabling engineers to trust their assets without constant leak monitoring. What Defines an O Ring Series? An O-ring family is more than a circular cross-section—it's a system of sizes, materials, and durometers aligned with global standards and real-world duties: Size systems: AS568 (inch), ISO 3601, JIS B 2401 (metric) ensure consistent fit across glands. Static vs Dynamic: Static seals handle higher squeeze and pressure; dynamic seals require lower compression, smooth finishes, and lubrication to reduce abrasion and heat. Durometer: Typically 70 Shore A general purpose; 80–90 Shore A for high pressure; 50–60 Shore A for low temperature and delicate housings. Gland types: Piston, rod, and face glands fit different squeeze geometries; backup rings protect against extrusion under pressure. Materials and Performance Selecting the right elastomer shapes chemical resistance, temperature range, compression set, and durability: NBR (nitrile): For petroleum oils, fuels; −40 to 125°C; used in hydraulics, gearboxes. EPDM: Excellent for steam, hot water, polar chemicals; −40 to 125°C; common in water treatment, brakes. FKM (fluoroelastomer): Resistant to oils, fuels with ethanol, solvents; −20 to 250°C; ideal for chemical pumps, engine bays. VMQ (silicone): Wide temperature flexibility (−60 to 225°C); used in aerospace, electronics, static seals. Key Design and Installation Principles Radial squeeze: 10–30%; ID stretch: 2–8% depending on application. Gland fill: ≤85% max swell to prevent wear and damage. Surface finish: Smooth mating surfaces reduce abrasion and leakage. Lubrication: Use compatible lubricants to ease installation and reduce friction. Backups and clearances: Add PTFE or backup rings to avoid extrusion. Installation discipline: Avoid twist, use chamfers and deburred edges to prevent damage. Typical Applications Pumps, valves, motors, gearboxes, hydraulic and pneumatic systems. Industrial machinery, robotics, energy sector, construction, and agriculture. Metallurgy, chemical processing, water treatment, transportation, and household appliances. How DEDE Supports You With over 30 years in oil seal and O-ring manufacturing, DEDE offers: Extensive inventory of thousands of standard parts for fast delivery. Customized seals tailored to your media, pressure, motion, and installation. Expert technical support to optimize seal performance and reduce maintenance costs. Intelligent manufacturing, quality control, and global supply reach to 80+ countries. Choosing the Right O-ring Match elastomer to media and worst-case chemical exposure. Consider real temperature ranges including startup and hot spots. Balance pressure and motion requirements with durometer and backups. Align size standards early (AS568, ISO, JIS) to ensure fit and availability. When specifying, share your toughest duty cycle and constraints. DEDE combines material science, groove design, and reliable supply to keep your systems sealed and running smoothly.

Minimum Order: 1000

In applications that require high pressure sealing—especially in bolted and threaded connections and pipe joints—failure rarely gives a second chance. Mechanical engineering teams, hydraulic and pneumatic systems, and the oil and gas industry rely on the bonded seal series to create a dependable face seal simply by tightening the joint. What it is and why it works A bonded seal is a washer: a hard outer ring, typically steel, and an inner elastomeric ring that acts as a gasket. The elastomer—often nitrile rubber (NBR)—is bonded by heat and pressure to the metal, so it stays in place under load. Tightening compresses the elastomer between mating faces while the metal ring limits lateral flow, boosting burst resistance and pressure rating. Because the metal ring itself retains the gasket, parts don’t need grooves to capture an O‑ring. That simplifies machining and raises assembly tolerance. Two styles exist: self‑centring designs add an inner rubber lip to locate the seal at the hole’s centre; non‑self‑centring variants suit broader geometries. Materials, pressure, temperature · Metals: zinc‑plated/phosphated carbon steel, or stainless 304/316 where corrosion matters. · Elastomers: NBR for general oil service; FKM for elevated temperature and chemicals. · Pressure: well suited to mid‑to‑high static pressures in hydraulic duty; actual limits depend on size, compound, surface finish, and preload—validate against your duty cycle. Temperature (typical): NBR about −40 to 125°C; FKM −20 to 250°C. Where the bonded seal series adds the most value · Connection types: bolt/stud face sealing, BSP/NPT/Metric/SAE shoulders, auxiliary flange sealing, plugs and sensor ports. · Industries and equipment: pumps, motors, gearboxes, engines and lube systems; hydraulic and pneumatic manifolds; construction and agricultural machinery; oil and gas production/transfer; chemical and metallurgical lines; water treatment skids; marine/offshore packages; wind turbine yaw/pitch hydraulics; commercial vehicles and passenger cars; industrial machinery and hydraulic actuators. Work with DEDE for a smoother path Services: · Fast shipment of standard parts—broad coverage of O‑rings, oil seals and more to meet urgent needs. · End‑to‑end customization—from compound selection and geometry to production testing—for non‑standard seals matched to your media, load, and temperature. · Technical enablement—30+ years of sealing experience to refine your stack, cut maintenance, and lift reliability. Highlights: · In‑house intelligent manufacturing; · Wide model coverage with stock on hand; · Shipped to 80+ countries; · Trusted by well‑known global brands; · Provincial technology innovation centre credentials; · Recognized as a specialized and innovative enterprise, and as a high‑tech enterprise; · A leading player within a featured industrial cluster. Practical selection and assembly tips · Choose elastomer by medium and temperature first; match metal ring corrosion resistance to the environment. · Size ID/OD to the fastener and shoulder; pick self‑centring types when speed and concentricity matter. · Keep faces flat and clean (aim for Ra ≤ 1.6 μm); torque per fastener grade and lubrication to avoid over‑crushing. Pressure‑ramp on commissioning, leak‑check, and re‑torque after early thermal cycles for long‑term stability. For joints where leakage is not an option, the bonded seal series converts risk into routine: locate, tighten, pressurize. If you’re weighing standard versus custom, DEDE can align materials and geometry to your pressure window and media so the seal performs from day one.

Minimum Order: 500

When rotating equipment encounters complex operating conditions, such as high pressure, fluctuating pressure, and elevated oil temperatures, the sealing system's mission becomes more than just "preventing oil leaks." Seemingly minor issues—slight shaft misalignment, unclean oil, or sudden load changes—often push seals to their limits, particularly lip stability, which can easily lead to problems. We've found in numerous field projects that the TCN high-pressure seal series is particularly well-suited to these applications characterized by fluctuating pressures and rising temperatures. It withstands not only steady-state pressures but also sudden fluctuations and disturbances. TCN High-Pressure Seal Structure • Dual-layer lip construction: The primary lip is responsible for pressure resistance and oil conduction, while the secondary lip is responsible for dust protection. For example, when equipment operates in dusty and humid environments for extended periods, the secondary lip effectively prevents external contaminants from entering the system, slowing down media degradation and lip wear. Internal spring: A short-coil design is used. This design offers the advantage of maintaining consistent lip pressure, ensuring a stable fit even with slight shaft wear or deformation, and preventing oil jumps. The combination of the housing and rubber-coated outer diameter provides both rigid support and greater tolerance for seat bore machining accuracy and thermal expansion and contraction, ensuring greater peace of mind and stability during assembly. How do we choose materials? Experience tells you these details are invaluable. We recommend choosing a flexible material based on the specific application: Nitrile (NBR): Excellent oil resistance and reasonable price. Suitable for applications with temperatures below 125°C, especially for equipment using standard mineral or synthetic oils. Fluorocarbon (FKM): This material is essential for high temperatures or highly corrosive media, and it resists degradation even after long-term operation. The housing and spring: We typically choose carbon steel or stainless steel, prioritizing strength over corrosion resistance depending on the application. Parameters · Operating Pressure: The recommended range is generally below 0.3 MPa. Of course, in some low-speed, well-lubricated, and heat-dissipating applications, higher pressures can be used, but actual measurement is essential. · Surface Roughness: This is often overlooked. We recommend a Ra of 0.2–0.8 μm. A surface that is too rough will damage the lip, while a surface that is too smooth will prevent film formation. This subtle difference can make the difference in the lifespan of the oil seal. · Lubrication and Cooling: Whether pre-lubrication is performed before startup, whether a film is formed, and whether there are hot spots all directly impact seal life. What equipment are TCN high-pressure seals commonly used in? · Pumps: For example, clean water pumps, chemical pumps, and sewage pumps, these seals perform well on pressure-bearing shaft ends. · Hydraulic systems: For hydraulic motors, plunger pumps, and gear pumps, these systems experience pulsation and low-speed, high-torque conditions, where the TCN series performs reliably. · Reducers and powertrains: Gearboxes and drive shaft ends, especially those operating in environments with combined thermal expansion and backpressure. · Industrial equipment and robots: Spindle and joint units, which are particularly sensitive to leakage. · Construction and agricultural machinery: Excavators, harvesters, and loaders. These types of equipment typically operate in very dirty environments and require high sealing requirements. · Wind turbine and marine equipment: Wind turbine yaw systems, pitch control mechanisms, and propeller shaft seals require water and dust resistance and pressure resistance. · Automobiles and heavy-duty trucks: Used in transmissions, differentials, and power take-off shaft ends, emphasizing durability and leakage control. If you're working in extreme conditions, such as vacuum, ultra-high speed, or high-corrosion applications, we recommend considering customized solutions or specialized oil seal models rather than simply using generic parts. Our Services · Fast In-Stock Delivery: We have a wide inventory of standard models, ensuring reliable emergency response. · Customized Services: We support the entire process from design, material selection, and sample testing. · Over 30 Years of Industry Experience: We not only sell seals, but also understand system optimization. We can help you improve overall performance through aspects such as heat transfer, lubrication, and vibration control. Seals aren't just for fitting and forgetting; they determine your equipment's stability, operating costs, and maintenance intervals. So, rather than waiting for problems, it's better to choose the right one from the start. We've tested, used, and seen the TCN high-pressure seal series overcome complex challenges in medium- and high-pressure rotary applications on multiple projects. We'd also like to share this experience with you: Don't just look at the data sheet; understand the issues facing your equipment before choosing the right solution. This is the beginning of understanding seal usage.

Minimum Order: 500

In hydraulic equipment and industrial automation systems, the stability of the entire system depends on various factors. However, there is one component that requires low investment and is easy to replace—this is the UN-type rod seal we are going to explore today. What is a UN Seal? UN seal (also known as a U-cup or U-type seal) is a versatile sealing component that can be installed on either piston rods or pistons. It features a distinctive “U” shaped profile, with both the inner and outer sealing lips specifically designed to optimize sealing performance in rod and piston applications. Material Selection and Structural Advantages To meet diverse sealing demands across different working conditions, DEDE offers this series in two material options: Polyurethane (PU) and Fluororubber (FKM). PU Material: Often referred to as the “fifth engineering plastic,” polyurethane combines the elasticity of rubber with the durability of plastic. It offers excellent wear resistance, tear strength, and chemical stability. Even under high-frequency motion and low compression set conditions, it maintains reliable sealing performance. With an operating temperature range of -20°C to +120°C, PU seals are well-suited for variable outdoor and industrial environments. FKM Material: Known for its exceptional resistance to high temperatures and oils, FKM is ideal for harsh chemical environments and high-temperature, high- pressure conditions. It is particularly suitable for high-vacuum systems, oil- filled systems, or applications requiring stringent media compatibility—such as hydraulic pumps and turbine sealing systems. Key Features and Application Adaptability The UN-type rod seal series offers the following advantages: High compatibility with both dynamic and static sealing in medium to high- pressure hydraulic systems; Precision lip design ensures low friction and stable oil return; Automatically enhances sealing performance as pressure increases, preventing leakage; Can be used in conjunction with dust wipers to significantly extend system lifespan. Thanks to these advantages, UN-type rod seals have become vital components in ensuring long-term operational stability across a wide range of equipment, including industrial hydraulic cylinders, automotive hydraulic power steering systems, electromechanical arms, and agricultural machinery hydraulic systems. Application Industries Construction Machinery: Hydraulic cylinder sealing systems in excavators, bulldozers, etc.; Automation Equipment: Sealing control at actuator ends in robots and mechanical arms; Industrial Equipment: Hydraulic presses, punching machines, CNC machinery; Automotive Industry: Rod seals used in power steering and transmission systems; Energy Equipment: Hydraulic regulation systems in wind power installations. By continuously optimizing material selection and refining manufacturing processes, DEDE has ensured that the UN series offers outstanding durability and low maintenance costs. DEDE's Service and Technical Support With over 30 years of manufacturing experience, DEDE is a well-established sealing systems provider with its own production facilities and a global supply and service network spanning more than 80 countries. Our key service strengths include: Fast delivery of standard parts: Covering tens of thousands of specifications to quickly meet customer demands; Customized sealing solutions: End-to-end services from structural design and material formulation to on-site testing; Sealing performance optimization: An experienced engineering team helps customers reduce maintenance frequency and extend service life. Additionally, DEDE is recognized as a provincial-level "Specialized and Innovative" enterprise and a national high-tech enterprise, making it a benchmark brand in intelligent manufacturing and technological innovation within the sealing industry. Why Choose DEDE’s UN Seal Series? Though small in size, sealing components are critical to the stable operation of systems. In high-frequency motion, high-pressure circuits, and harsh chemical environments, DEDE’s UN seal series delivers outstanding performance and versatile applicability—offering solid protection for reliable equipment operation. We don’t just sell seals—we deliver dependable sealing solutions. If you’re facing complex sealing challenges, feel free to contact us for technical advice or customized solutions.

Minimum Order: 500

Seals play a crucial role in hydraulic systems. U-shaped seals made of polyurethane (PU) and fluororubber (FKM) perform particularly well in high- intensity environments, such as those found in construction machinery, motors, and industrial robots. Why choose polyurethane (PU) and fluororubber (FKM)? Polyurethane is known in the industry as the "fifth plastic" because it combines the properties of both plastic and rubber. Honestly, traditional rubber often quickly breaks down in acidic and alkaline environments or when exposed to organic solvents, while PU offers far greater resistance. Its elasticity and toughness prevent deformation and aging even after extended use, ensuring a stable seal. Fluororubber is highly chemically stable, offering resistance to high temperatures, oils, high vacuum, acids, alkalis, and a variety of chemicals. It also boasts relatively good media resistance among elastomers. NQKSF is U-shaped piston seal series, designed specifically for hydraulic systems, can withstand temperature fluctuations from -20°C to 250°C, making it suitable for a variety of complex environments. More importantly, as oil pressure increases, its sealing force automatically strengthens, significantly reducing leakage. Application Scenarios and Industry Demands Speaking of their applications, U-shaped piston seals are used across a wide range of industries. Industrial machinery, especially pumps and hydraulic cylinders, places stringent demands on seals. Seals in motors, gearboxes, and engines also require both high-pressure and wear resistance. Agricultural and construction machinery often operate in harsh environments, making U-shaped seals' corrosion resistance and compression resistance an excellent choice. Of course, industries like water treatment, wind power generation, and the chemical industry also place extremely high demands on seal stability and durability. NQKSF has accumulated extensive experience in the sealing field over many years, exporting its products to over 80 countries and earning widespread recognition. NQKSF is Service Advantages NQKSF is backed by a physical factory and over 30 years of manufacturing experience. We offer a comprehensive inventory of O-rings and oil seals, enabling us to quickly respond to urgent customer needs. NQKSF offers comprehensive, customized services, from material selection and structural design to testing, to address sealing challenges in diverse operating conditions. Our technical team helps customers optimize sealing performance, reducing equipment maintenance costs and extending service life. Long-term customers report that NQKSF is products are stable and reliable, with excellent after- sales service. U-type piston seals, particularly NQKSF is, are a wise choice for many industry customers seeking to improve equipment stability and operational efficiency. While small, these seals are crucial to the health of the entire system. Whether in high-pressure hydraulic systems or harsh industrial environments, U- type piston seals demonstrate their unique advantages. For more details, please contact us or leave us a message, and we'll promptly respond.

Minimum Order: 500

I still remember the first time I saw a hydraulic cylinder fail on a steel plant line. The rod looked clean. The parts looked fine. But the fabric- reinforced V-packing set had worn out. That got me thinking—this isn’t a weak seal, it’s just stressed beyond limits. Why Fabric Reinforced V-Packings? Here’s the deal: you have high-pressure, frequent reciprocating motion, sometimes dirty hydraulic oil. Standard V-ring or O-ring won’t cut it. That’s when fabric-reinforced V-packing sets, with canvas backing and rubber lip, makes sense. At DEDE, we offer exactly that. Most importantly, we’ve based our designs on real failure modes. You pick material (like canvas + NBR, or canvas + FKM), and adjust ring count based on pressure. Works up to 40 MPa reliably. Real Use Cases We’ve Seen · Mining rigs—harsh dirt and high load cycles. Our canvas stack cut replacement from once per month to quarterly. · Metaller hydraulic cylinders—vibration from presses. Complaints dropped after switch. · Oilfield pumps—pressure spikes. PEEK/PTFE reinforced stacks gave seal life from weeks to half a year. The Stack Structure Matters, let me break it down: Top is male adapter, then 3–7 V-rings (fabric-reinforced rubber), bottom is female adapter. When pressure mounts, the female adapter pushes down. Each ring expands outward. Sealing happens progressively. First ring takes most stress. Leaks reduce as it passes through next ring. If you need tighter seal, add another ring. Too much friction? Remove one. It’s field-adjustable. Perfect for maintenance teams. We offer multiple compounds: · Canvas + NBR — good for mineral hydraulic oil, standard systems. · Canvas + FKM — chemical resistant, ideal where oil contains additives. Choice depends on fluid, stroke speed, temperature, alignment. We help match it all through technical review. Why Use DEDE is Approach · Immediate shipping on stock of over 10,000 seal specs (V-packing, O-ring, oil seal). · Custom design service—from sketches to prototype, match your exact cylinder size. · Engineering knowledge—we evaluate your pressure, stroke, fluid, even rod surface finish. · Manufacturing expertise—we’re a recognized High-Tech Enterprise, Innovation Center, and specialize in sealing OEM. We ship to more than 80 countries. Our clients include OEMs in construction machinery, oil/gas, metallurgy, mining, rail traction, robotics. If your equipment suffers from leakage, short seal life, or frequent maintenance—especially under high pressure or cyclic load—try a fabric- reinforced stack instead of a molded ring. Reach out to the DEDE engineering team. Share your cylinder bore, rod size, oil type, and we’ll help configure a V-packing stack. Adjust ring count, material compound, compression—everything can be fine-tuned. We don’t just sell seals. We solve the problem that seal failure refuses to leave behind.

Minimum Order: 500

If you’ve ever dealt with a pneumatic cylinder losing power, slow actuator movement, or air leakage in a production line, chances are the issue wasn’t in the hardware or programming—it was the seal. Pneumatic piston seals might be small, but they do a big job. They’re responsible for keeping compressed air where it needs to be, resisting pressure changes, and ensuring every piston stroke happens without a hitch. In systems running thousands of cycles per day, a weak seal doesn’t just affect performance—it costs downtime, energy, and in some cases, even product loss. We’ve spent decades working with customers who rely on air-powered systems. That includes companies building automation equipment, operating textile lines, or managing industrial robots. The common question we hear is: "Do you have something that fits right, lasts longer, and doesn’t give us trouble down the line?” Our answer: Yes. And it starts with a deep understanding of how pneumatic piston seals behave in real machines—not just on paper. Built from the Right Material for the Right Reason We manufacture our pneumatic seals using NBR (nitrile rubber) NBR has the flexibility needed to create a tight seal, even when cylinders aren’t perfectly aligned. It can handle the friction from back-and-forth motion. And it resists air pressure without hardening or cracking prematurely. If you’re using dry air, or systems with occasional lubrication, NBR does the job well. In fact, many of the world’s top seal manufacturers still rely on NBR for pneumatic applications. What we’ve done is fine-tune our piston seal profiles and quality control to ensure the best fit for your cylinders, valves, compressors, or actuators. Here’s where we most often see the DEDE pneumatic piston seals series in action: · In linear actuators moving packaging equipment across high-speed lines · Inside robotic arms, where space is limited and the seal must stay effective through constant cycles · In automatic valves controlling air distribution in complex machinery · Within pneumatic presses, where sealing must withstand quick, repeated bursts of pressure · In low-noise systems, where low-friction operation reduces vibration and wear In every one of these systems, a piston seal that’s even slightly worn can throw off performance. That’s why our customers look for sealing parts that are easy to install, dependable from the first cycle, and don’t demand constant adjustment or lubrication. What Makes DEDE Different? We’re not just selling sealing rings—we’re supporting production uptime. Here’s how: · In-stock availability: Over 10,000 common sizes and profiles ready to ship through our DEDE platform · Customization: Need a specific profile, tighter tolerance, or non-standard size? We can handle that from material selection through final production · 30+ years of sealing experience: Our team understands the interaction between seal, cylinder, and system—so we help you choose smarter · Reliable manufacturing: All products are made in our own facility, allowing us to monitor consistency and quality from start to finish More Than Just Rubber A lot of companies make seals. What sets us apart is that we’re known for real-world problem solving. One customer came to us needing a piston seal for a fast-moving actuator inside a bottling line. They had issues with seals from other suppliers breaking down within weeks. Our engineers took a closer look—not just at the seal, but at the movement speed, air pressure, and mounting surfaces. We recommended a slightly modified lip profile, same NBR material, but with improved surface contact. After switching to our version, their replacement interval extended from 3 weeks to over 6 months. That’s the difference a right-fit seal can make. We’re proud that DEDE seals are now used in machines operating in over 80 countries. We provide support not only to large OEM, but also to local maintenance teams and system integrators. If you’re tired of replacing pneumatic seals every few months, or if you’ve struggled to find a seal that fits your design without excessive rework, it might be time to talk to us. DEDE is pneumatic piston seal series isn’t a luxury—it’s a solution built on practical experience, time-tested materials, and service that goes beyond the catalog. Let’s make your machines run smoother, longer, and with fewer interruptions. We’ll handle the sealing—so you can focus on production.

Minimum Order: 500

We were recently working with a mid-sized gearbox supplier who had issues with dirt entering their systems, even though they already used oil seals. They'd tried a few fixes — extra dust shields, better housing precision — but none stuck. What solved the problem? A simple VA-style V-ring seal. No housing modification, no rework. Just stretched it onto the shaft, and the issue disappeared. That's the kind of story we’ve heard more than once. It doesn’t matter if you're working on agricultural machinery, wind turbines, electric motors, or industrial arms. The VA/VS V-ring seal series works across the board — partly because it’s not trying to do too much. Just block out the junk and stay in place. The Role It Plays — Quiet but Critical VA/VS V-ring seal small, rubbery, and doesn’t look like much. But once you've had a bearing fail due to fine dust or water ingress, you realize what a tiny lip of rubber can prevent. The V-ring doesn’t press into the housing. It sits loosely on the shaft — and that’s the beauty of it. As the shaft turns, so does the V-ring, and its flexible lip maintains light contact with the counter face. That contact — soft as it may be — creates an effective seal, especially when speed increases. Centrifugal force starts to sling dirt and moisture away. In real usage, it’s what you'd call a first line of defense. It won’t hold pressure, and it won’t stop oil if there's a flood inside — but it will make sure the main oil seal doesn’t have to fight off grit or humidity on its own. VA and VS — Same Concept, Different Strengths we’ve supplies both VA and VS profiles, depending on where and how you're mounting. · VA is the classic. Slimmer, works where space is limited, and typically used on cleaner shafts or where loads are moderate. · VS, on the other hand, is a bit more rugged. Extra thick in the base, so it stays more stable when there's axial movement, vibration, or misalignment. We’ve seen VS rings used in mining conveyors where shaft conditions weren’t ideal — and yet, the seals held on for months without needing replacement. It's Not Just About Shape — Material Matters A customer once asked us, “Do I really need FKM for this?” Short answer: not always — but sometimes absolutely yes. Most VA/VS V-rings come in: · NBR (Nitrile rubber) — Handles oil well, affordable, works in most industrial environments with temps from -40°C to 125°C. · FKM (Fluoroelastomer) — Tougher, chemical-resistant, and survives in hot or chemically aggressive surroundings (up to 250°C). We typically recommend NBR for general motors, pumps, and gearboxes. But if you're working in a chemical plant, offshore equipment, or any setup that runs hot, FKM is the safer choice. Installation — Easier Than You’d Expect Here’s where the V-ring outshines traditional seals. You don’t need to disassemble the entire shaft assembly. There’s no press-fitting or bore matching. You just stretch it over the shaft, position it where needed, and the seal takes care of the rest. A drop of lubricant on the lip helps it settle smoothly against the counter face. That’s it. We’ve done installs in under five minutes. Some plants keep a few dozen on- hand just for emergency replacements — because it’s the kind of part you don’t think about until it’s gone, and then you wish you'd stocked more. Where VA/VS Rings Show Up (More Often Than You Think) · Electric motors — Particularly in workshops with fine dust or metal shavings. · Pump systems — Protecting internal oil chambers from external moisture. · Gearboxes — Especially on construction or agricultural equipment. · Wind turbines — Variable speed, exposed locations — the perfect V-ring scenario. · Robot joints or arms — Compact space, rotating shafts — check. What Makes DEDE a Reliable Source? We’ve seen plenty of suppliers over the years, and DEDE stands out for a few reasons: · Wide coverage — 10,000+ spec variants across seals, rings, gaskets, and more. · Fast fulfillment — We’ve had urgent VA-type rings shipped same-day. · Customization — Need a non-standard shaft size or want a hybrid compound? They’ll get it sorted. · Global presence — Used in 80+ countries, across industries from aerospace to energy. · Strong credentials — Recognized as a high-tech manufacturer and innovation- driven seal developer. We don’t just sell seals — we understand sealing. There’s a difference. V-ring not expensive. It’s not complex. And it doesn’t get in the way. But it protects — effectively. If your machinery has rotating shafts and you’re tired of grit, moisture, or premature oil seal wear, the VA/VS V-ring seal series from DEDE is a smart addition. Install once. Forget it for a long time.

Minimum Order: 500

In mechanical systems, we often assume a seal is just a passive part—rubber, maybe a spring, something that holds back oil and grease. But when a machine moves in more than one way—rotation plus axial movement, speed plus pressure fluctuation—a basic oil seal often falls behind. That’s where the combi oil seal earns its keep. It’s not a fancy buzzword. It’s a solution that’s been proven in heavy-duty equipment, energy applications, and industrial robotics where the usual stuff just doesn’t last. At its core, a combi oil seal is a hybrid. Two or more seal parts are brought together—most commonly, steel reinforcement + oil-resistant rubber, or a more advanced pairing: rubber + PTFE. The result is a compact seal unit that works harder and longer in complex motion environments. It’s About What the Seal Does—Not Just What It’s Made Of Let’s skip the catalog specs for a second. What really matters is this: It runs cooler. It handles pressure spikes better. It doesn't wear out the shaft. It lasts longer in dirt, vibration, and heat. The PTFE-based versions are particularly interesting. Because PTFE (commonly known as Teflon) doesn’t stick, doesn’t absorb oil, and has a super low coefficient of friction. That makes it ideal for systems with frequent start- stop motion or high shaft speeds. Unlike rubber, it won’t heat up and degrade quickly under movement. At DEDE, we’ve worked hard on refining the contact zones in our combi seals. For example, the rubber lip only lightly touches the shaft, just enough to keep a seal but not enough to fight against motion. That way, there’s less torque, less wear, and less risk of failure over time. Where You’ll Really See the Benefits These seals aren’t just “better”—they’re just more appropriate for certain industries:

Minimum Order: 500

A lot of people underestimate how much trouble a small leak can cause—until it starts affecting a whole system. If you’ve ever dealt with hydraulic leaks in a gearbox or seen oil dust caking around a drive axle, you’ll understand just how crucial a solid sealing setup really is. Over the years, one solution that’s gained popularity in rugged applications is the combi oil seal. It isn’t a flashy invention, but that’s the point. It's a practical, well- thought-out configuration made to address recurring issues in machines that run under pressure, vibration, and environmental exposure. Built from Experience, Not Just Materials The basic idea behind a combi seal is pretty simple: instead of relying on a single lip or material to block contaminants and hold fluid, you use a layered design—often involving rubber, PTFE, and sometimes spring elements—to get better performance across more demanding conditions. What makes this design useful is how it leverages different materials. The rubber provides elasticity and contact, while PTFE (polytetrafluoroethylene) gives the seal its edge in environments where things get hot, dirty, or corrosive. Notably, PTFE’s ability to resist sticking is a huge bonus. Many users report that over time, seals without PTFE tend to gum up—especially where dust mixes with lubricants. PTFE holds up better, even when cycling back and forth repeatedly. Where the Combi Seal Really Fits · Heavy-duty transport and construction vehicles—particularly wheel hubs and axle joints that face dirt, shock, and speed. · Agricultural machines like harvesters and planters—often operating in muddy or dusty fields. · Industrial hydraulic systems—especially those where access is limited and breakdowns are costly. · Wind turbines—where the yaw systems have to keep moving despite constant wind-blown sand and salt exposure. · Metallurgy equipment—rolling lines, furnaces, or gearboxes where both temperature and debris are a constant. What unites all these situations isn’t just harsh conditions—it’s the fact that replacing seals is either expensive, time-consuming, or both. That’s why long service life, low maintenance, and predictable wear behavior matter so much. Not Just Theory—NQKSF Builds These with Purpose At NQKSF, we’ve spent more than three decades working with OEMs, maintenance teams, and machine builders across different sectors. We don’t just sell combi seals—we help make sure they’re the right fit, both in size and in function. Sometimes a customer comes to us thinking they need a high-temperature rubber seal, when the real issue is shaft misalignment or pressure spikes. In those cases, we help them choose a combi structure with a built-in PTFE element or a spring-load that can adapt to changes. It’s not about over-engineering—it’s about choosing the right setup for the job. We keep over 10,000 different sealing parts in stock, including O-rings, traditional oil seals, and multiple configurations of combi seals. That allows us to ship standard products quickly and focus our engineering time on custom solutions where it matters most. Real Customization Means Real Results For us, customization doesn’t mean just changing the color of the rubber. It means: · Selecting the best elastomer or PTFE grade for the media involved · Adjusting lip geometry for speed, pressure, or directionality · Designing for compact systems where space is at a premium · Testing performance under cycling, vibration, or chemical exposure With in-house simulation tools and full-scale test rigs, we can model how a seal will behave before it ever reaches your equipment. That’s saved several of our clients major downtime in the past—especially in cases where small errors in seal design led to gradual leakage or premature wear. Backed by Facilities, Not Just Promises We're proud of our intelligent manufacturing setup. From material inspection to final packing, the entire production line is under our own roof. That gives us full control over quality, delivery, and consistency. We don’t just serve the domestic market either. Our seals are in operation in over 80 countries, and we’ve worked with several globally recognized equipment brands. We're also recognized as a High-Tech Enterprise and have been designated a Provincial Innovation Center in the sealing industry. Let’s be clear—combi oil seals aren’t perfect for every situation. In slow- sliding applications where ultra-tight static sealing is needed, a different type of lip seal might be a better option. But if you’re dealing with systems that move, rotate, vibrate, or run through dirty conditions for hours every day —this is where the combi seal proves its worth. The dual-material design cuts friction, handles pressure, resists wear, and helps reduce the frequency of replacement. That means fewer shutdowns, less troubleshooting, and more stable performance over time. We don’t think of combi oil seals as just products—they’re part of an entire system that needs to work reliably. Whether it’s an excavator axle, a wind turbine yaw gear, or a robotic joint in a dusty factory, the right seal can make the difference. At NQKSF, we combine real-world field knowledge, production control, and engineering service to support your sealing needs. We're here to help you get it right the first time—because we know what’s at stake when seals fail.

Minimum Order: 500

Sometimes, the smallest component in a machine ends up being the one that keeps everything else working. That’s usually the case with stainless steel PTFE seals series. They don’t get much attention—until something goes wrong. In our work, especially when dealing with pressure systems or chemical exposure, we needed something that didn’t just “fit,” but kept performing. That’s how we came to use these stainless PTFE seals. Not a new invention, but when combined properly, they hold up far better than most alternatives. You’ve got PTFE, which helps with friction and chemical resistance. That part’s straightforward. What’s often overlooked is how it behaves under stress—especially heat and mechanical load. That’s where the stainless core comes in. It gives shape. Holds structure. Keeps things aligned even after hours of operation. We’ve used these seals in pumps, motors, and rotary machines. Also in places where cleaning fluids or pressure cycling tends to kill rubber-based parts. They’re not magic. But when you choose the right shape—sometimes spring- loaded lips, sometimes a flanged edge—they tend to last. We keep a fair amount of types in stock. If a customer calls with a rush job, we usually have a workaround or a close match. For special cases, we work through sketches, simulations, sometimes just a quick call. We've got teams that know how this stuff behaves. The seals we send out usually fall within -65 to 260 degrees C. That’s enough for most systems we touch. Pressure? Depends. But 30 or 40 MPa isn’t out of range in static use. That said, we always recommend testing in the real setup. A lot of what we do isn’t about selling seals. It’s helping engineers avoid problems later on. When you choose a design early that matches real working conditions—not just catalog specs—you end up with fewer breakdowns, and fewer callbacks. That’s what we aim for.

Minimum Order: 500

In many industrial settings, the integrity of your system depends on the smallest components doing their job without fail. Seals, in particular, play a silent yet critical role—keeping fluids contained, contaminants out, and operations running without interruption. For conditions that push materials to the limit, NQKSF offers a solution built for endurance: stainless steel- reinforced PTFE seals. Stainless steel PTFE seals are not designed for the average application. They're developed for situations where ordinary seals deform, degrade, or simply give out. Whether it’s exposure to aggressive chemicals, fluctuating temperatures, or high-pressure environments, this series delivers dependable sealing performance when it matters most. Why PTFE Stainless Steel Shaft Seals? PTFE (Polytetrafluoroethylene) has long been a go-to material in sealing due to its remarkable chemical resistance and low friction. But in high-stress environments, PTFE alone may not offer the structural stability required. That’s where stainless steel reinforcement comes in. By integrating precision-formed stainless steel cores—typically in 304 or 316 grade—we combine the flexibility and inertness of PTFE with the strength and rigidity needed for high-pressure or mechanically demanding setups. The result is a robust sealing element that holds its form under stress while maintaining all the advantages of PTFE. Applications Across Critical Industries Stainless steel PTFE shaft seals are commonly used in industries where downtime is costly and safety is non-negotiable: · Chemical and petrochemical plants – For pipelines, valves, and reactors handling corrosive fluids. · Aerospace and automotive – In systems exposed to thermal shock, vibration, or high rotational speeds. · Power generation – Steam turbines, pumps, and compressors that face continuous pressure cycling. · Pharmaceutical and food equipment – Applications requiring both chemical inertness and hygiene compliance. Tailored to Perform We don’t believe in one-size-fits-all solutions. That’s why our stainless steel-reinforced PTFE seals come in multiple configurations: · Spring-energized lips for variable pressure conditions · Flanged and V-ring styles for axial loads · Custom lip geometries for specific dynamic sealing requirements Key performance metrics include: · Operating temperature: -65°C to +260°C (higher upon request) · Pressure tolerance: Up to 40 MPa (static or low-speed dynamic) · Chemical compatibility: Resistant to most acids, solvents, fuels, and high- temperature steam Wear resistance: Outstanding longevity in abrasive or high-cycle environments The NQKSF Difference What sets NQKSF apart isn’t just the materials we use—it’s how we work with our clients. With over three decades of expertise in sealing technology, we support everything from prototype development to volume production. · Over 10,000 part numbers in stock, including standard O-rings, oil seals, and customized designs · Fast delivery from our extensive domestic inventory · Certified R&D team with simulation, testing, and material analysis capabilities · Global customer base in over 80 countries We understand that every system has its own challenges. That’s why we offer engineering support from day one—helping you choose the right seal based on real-world conditions, not just specs on paper. If your system operates in an environment where failure is not an option, consider upgrading to NQKSF is stainless steel-reinforced PTFE seals. Backed by deep engineering knowledge and reliable production, PTFE seals series are built to handle whatever your machinery throws at them.

Minimum Order: 500