Mechanical Hardware

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

Drum Forging Brand origin: Runchi  shandong Processing ability: turning, milling, planing, grinding, drilling Maximum weight: Weight ≤ 30 tons Forging equipment: hydraulic press Processing property: hot forging Processing materials: according to customer requirements Heat treatment: normalizing, quenching and tempering, annealing, tempering, surface quenching

Wheel Hub Forging Main features: [Manufacturing Standards] Strictly produce forgings in accordance with established relevant requirements [Technical parameters] According to relevant standards or drawings and requirements provided by the customer [ Product features ] Made according to customer drawings, transparent in price, qualified in size, long in service life, and smooth in surface Daily use: [Product Usage] Engineering machinery, petroleum machinery, shipbuilding machinery, agricultural machinery, wind power equipment, chemical equipment Industries such as pressure vessels, nuclear power, new energy, metallurgy, etc.

Nozzle Forging Brand origin: Runchi  shandong Processing ability: turning, milling, planing, grinding, drilling Maximum weight: Weight ≤ 30 tons Forging equipment: hydraulic press Processing property: hot forging Processing materials: according to customer requirements Heat treatment: normalizing, quenching and tempering, annealing, tempering, surface quenching

Marine Forging Main features: [Manufacturing Standards] Strictly produce custom forgings in accordance with established relevant requirements [Technical parameters] According to relevant standards or drawings and requirements provided by the customer [ Product features ] Made according to customer drawings, transparent in price, qualified in size, long in service life, and smooth in surface Daily use: [Product Usage] Engineering machinery, petroleum machinery, shipbuilding machinery, agricultural machinery, wind power equipment, chemical equipment Industries such as pressure vessels, nuclear power, new energy, metallurgy, etc.

Product Name: Bearing housing Brand origin: Runchi shandong Processing ability: turning, milling, planing, grinding, drilling Maximum weight: Weight ≤ 30 tons Forging equipment: hydraulic press Processing property: hot forging Processing materials: according to customer requirements Heat treatment: normalizing, quenching and tempering, annealing, tempering, surface quenching

Duplex stainless steel desulfurization pump TLB series desulfurization pump is a new type, high efficiency, single stage, single suction horizontal centrifugal pump, which is developed by our company by absorbing foreign advanced technology and combining the actual situation of domestic desulfurization industry. Features: Main advantage: Wide range of application Long seal life Abrasion resistance, corrosion resistance, no blockage Application: Applicable industry: flue gas desulfurization (wet limestone/gypsum desulfurization, double alkali desulfurization, circulating fluidized bed desulfurization, seawater desulfurization and ammonia desulfurization, etc. ) Applicable temperature: -20℃ ~ +150℃ Applicable medium: acid, alkali and salt of any concentration with solid content ≤40%, especially lime slurry, slurry, cinder liquid, slag liquid, waste acid, sewage, etc. (there is no limit to the hardness and soft quality of particles). Performance parameters: diameter DN25-DN500mm Flow of 1.6 m3 / h - 3000 m3 / h Head 5 m - 125 - m Flow component material: duplex stainless steel (2205;2507, 2605, Cr30A, CD4MCu) Mechanical seal material: non-pressure sintered silicon carbide.

Minimum Order: 1 bags

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

Self-priming non-clogging centrifugal horizontal pump ZW : Shaft coupling type (with suspension body, split type, shaft coupling structure, pump shaft and motor shaft are independent and transmitted through shaft coupling). ZWL: Closed coupled /Direct connection (pump shaft and motor shaft are coaxial, direct drive) The self-priming sewage drainage pump integrates self-priming and non-clogging sewage discharge, adopts an axial reflux external mixing type, and through the unique design of the pump body and impeller flow channel. It can be used as a general self-priming clean water pump without the need to install bottom valves and irrigation water. It can also suck and discharge fluids containing large solid particles and long fiber impurities. The pump can be widely used in municipal sewage engineering, river pond aquaculture, light industry, papermaking, textile, food, chemical, electrical and other fiber, pulp and mixed suspensions. It is an ideal impurity pump which handle the wastewater and dirty liquids. It has the characteristics of simple structure, good self-priming performance, strong sewage discharge capacity, high efficiency and energy saving, and easy use and maintenance.

Minimum Order: 1 bags

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

CWF Series marine horizontal crushing centrifugal sewage pump is a centrifugal pump with an open impeller, used in the sewage treatment of the temperature below 85 degrees Celsius. The lower diameter of the larger solid particles after being crushed by the circulation is not more than 5mm and is also suitable for low-temperature solidification and pulverization of marine heavy oil. There is a blade in the impeller and the pump inlet to crush contaminants in sewage, the back surface of the impeller with a short blade, the axial force generated by the balance of the pump. The seal of CWF Series marine crushing sewage pump is with double skeleton oil seal, pressure oil filling cup on the pump body can be regularly added to the lubricating oil. B type pump is with mechanical seal. CWF Marine crushing sewage pump between the pump body is connected with 1: 5 over 4 studs with taper strong to the inspection of the pump can easily be removed when the pump discharges, while the body is not exposed to dirt, the connection with the 0-shape rubber sealing ring. CWF Marine crushing sewage pump body is directly connected with motor, the direction of the pump from the direction of the suction pump is clockwise. CWF Marine crushing sewage pump is widely used in light industry, paper making, textile, food, chemicals, power industry, mining, boats, urban sewage drainage and aquatic culture.

Minimum Order: 1 bags