Mechanical Hardware

WQ(D)-S series fully stainless steel precision-cast sewage and sludge submersible electric pumps feature： a unique single and dual flow channel impeller structure, significantly enhancing the passage capability for debris. Pump features: oil chamber adopts a double mechanical seal with fluororubber, while the outer chamber uses a single mechanical seal structure with fluororubber, effectively reducing water ingress caused by friction between sediment and the shaft leading to wear. motor employs vacuum impregnation for F-class insulation and is equipped with a thermal protection device, effectively extending the pump's service life. pump casing is made of precision castings, featuring characteristics such as lightweight, corrosion resistance, energy efficiency, aesthetically pleasing appearance, hygiene, and environmental friendliness. An overheat protector (<2.2kW) and a current protector (2.2~4kW) are installed inside the electric pump to prevent motor overload and overheating. Customized corrosion-resistant cables, PTFE mechanical seals, and hightemperature motors (suitable for liquid temperatures ≤100°C) can be produced according to special customer requirements. Main application: Suitable to transport wastewater with solid particles in buildings, hospitals, residential areas, municipal engineering, road traffic and construction, chemical electroplating, factory sewage, aquaculture, pharmaceuticals, beverages, seawater and saltwater, general corrosive media, long fiber wastewater, and sewage

Minimum Order: 1 bags

DEDE Seal is recognized as a top manufacturer of industrial and automotive sealing solutions, with a focus on high-performance oil seals. The TG4 oil seal series represents the company’s core offering. TG4 Oil Seal Features: High-pressure and high-temperature resistance Excellent wear and chemical resistance Designed for dynamic applications on rotating shafts and hydraulic systems Supplementary Products: DEDE also produces O-rings and general sealing rings for standard applications, but the TG4 series remains the centerpiece. Materials: The TG4 seals are manufactured from NBR, HNBR, FKM, EPDM, and PTFE, ensuring compatibility with oils, water-based fluids, and various chemical environments. Advantages: With precise material selection and optimized design, DEDE TG4 oil seals deliver stable performance, extended service life, and adaptability across industrial machinery, automotive, and hydraulic systems.

Minimum Order: 1000

Fully plastic horizontal complete vacuum unit The complete unit consists of corrosion-resistant pumps, jet pumps, buffer tanks, water tanks, check valves, ball valves, pipe fittings, and other components, all made of reinforced polypropylene material. Its characteristics: movable, easy to install, corrosion resistant, non-toxic, high vacuum, large displacement, reasonable structure, reliable operation, and long service life. It is an ideal product to replace SZ type water ring pump and W type reciprocating vacuum pump. It can extract corrosive gases and be used in series with steam jet pumps, with a higher vacuum degree. It is widely used in industries such as chemical, pharmaceutical, textile, food, brewing, metallurgy, environmental protection, laboratory, etc. vacuum absorption, vacuum filtration, vacuum concentration, vacuum drying, vacuum crystallization, vacuum transportation, vacuum deoxygenation, vacuum oxygenation, vacuum fractionation, and other process processed.

Minimum Order: 1 bags

GBW concentrated sulfuric acid pipeline centrifugal pump is designed and made on the basis of ISW horizontal pipeline centrifugal pump for the conveying of concentrated sulfuric acid. GBW centrifugal pump uses the special cast iron and carbon steel materials for concentrated sulfuric acid and excellent hydraulic model. GBW concentrated sulfuric acid pipeline centrifugal pump is an ideal new generation of chemical pump. The pump shaft seal is made of high-quality mechanical seal with external mounting type, and the dynamic ring and static rings are made of new hard alloy or ceramics, which are wear-resistant, leak-free and have a long service life. It is widely used in the transportation of concentrated sulfuric acid medium in various chemical enterprises. GBW concentrated sulfuric acid pump features: 1.smooth operation: pump shaft absolute concentricity and impeller excellent static and static balance ensure smooth operation, no vibration. 2. No leakage: the pump shaft seal adopts external high-quality mechanical seal, and the dynamic and static rings are made of new sic to sic, which is corrosion- resistant, wear-resistant, leak-free and has a long service life. 3. Low noise: the water pump supported by two low noise bearings can operate smoothly, and there is basically no noise except the weak sound of the motor. 4. Low failure rate: the structure is simple and reasonable, the key parts are matched with international quality, and the whole machine's trouble-free working time is greatly improved. 5, easy maintenance: replace the seal, bearing, simple and convenient. 6, small volume: the outlet can be left, right, up three directions, then the pipe layout installation, save space. GBW type concentrated sulfuric acid centrifugal pump special steel used for sulfuric acid with consistency 80 to 100% and temperature up to 60 or 80℃. The special steel in this concentration and temperature range of sulfuric acid, the surface can produce a protective layer of iron sulfate film. Cast iron is not suitable for more than 100% fuming sulfuric acid, which may be due to the reaction of sulfur trioxide with the silicon contained in iron, resulting in the embrittlement of cast iron. Carbon steel is not suitable for 100 to 102% fuming sulfuric acid, more than 102% acid is applicable, the temperature limit is about 60℃. Dilute sulfuric acid has a great corrosion on steel, when the acid concentration is about 47%, the corrosion rate reaches the highest value. When the acid concentration is greater than 65%, the corrosion rate of steel is significantly reduced. So in the 65 to 80 percent range, lead or or other dilute acid resistant materials are used instead of steel material for the safe operation. Sulfuric acid concentration: 80% to 98% special cast iron, service temperature: 25℃ to 50℃ Sulfuric acid concentration: 80% to 98% special carbon steel ,service temperature: 25℃ to 60℃.

Minimum Order: 1 bags

SPP Pump summary: SP Series chemical mixed flow pump can economically and effectively transport the chemical neutral or corrosive liquids with uniform or some particles. And the pump has the discharging performance with large flow and low head. SPP pump performance range: Flow up 7000m3/h Head up 25m Working pressure:0.6MPA Working temperature:-20 to 120 degree Celsius SPP Pump application: Forced circulation in chemical processes mariculture urban gas engineering water treatment system etc Pump advantages: High pump efficiency, low energy consumption. Pump in the entire performance range of energy consumption is uniform, can be started under the closed valve, and the motor will not overload. Large cross - flow section, not easy for clogging. Strong structure and long service life.

Minimum Order: 1 bags

NYP internal gear pump is a kind of new positive displacement pump and is designed according to the different requirements from petroleum, chemical industry, paint, medicine, foodstuff and so on. NYP internal gear pump is widely applied to various mediums with different property and viscosity because of special structure and different pump materials. NYP internal gear pump is Especially suitable for high viscosity medium and fluid transport, such as resin, hot melt adhesive, heavy oil, asphalt, glue and other high viscosity medium. Medium viscosity:1.0cst to 300,000CST. Temperature:10DegC-200DegC. Working principle Driving gear (outside rotor) with internal tooth drives the internal rotor and turns in same direction in the full closed pump body. The pump casing and crescent of the front cover separate the inlet from the outlet. When it turns, negative pressure formed at the suction port, the liquid inhaled and being take to the outlet by rotor, then the liquid is expelled from the discharge port as the gears mesh. The transportation of liquids is finished. NYP Gear pump is mainly composed of internal rotor, outside rotor, shaft, pump casing, front cover, seal, bearing etc. The pump seal adopts packing seal or mechanical seal. When the delivered medium is high temperature, high viscosity or strong corrosion, packing seal should be adopted. When the delivered medium is easy crystallized, we can design the heat preservation jacket in pump casing and front cover in order to melt the medium with steam when working. The pump can be also fitted with the safety valve. The pump set is composed of the pump and motor and base plate. The driving way can be belt wheel or shaft coupling driving. The direction of rotation is clockwise viewed from coupling end. Seen from the electric motor to the pump, it rotates clockwise, enters from the right side and exits from the upper side.

Minimum Order: 1 bags

DG type boiler water-feeding pump is a common horizontal centrifugal pump used in conjunction with boilers. DG type boiler feed pump began production in 1960 and is an updated product of the GC type boiler feed pump. It is an energy-saving product jointly promoted by the National Economic Commission and the Ministry of Mechanical and Electrical Engineering, with an average efficiency 8% higher than the GC type. This type of centrifugal pump adopts the national recommended high-efficiency and energy-saving hydraulic model, which has the characteristics of wide performance range, high operating efficiency, and long service life. The DG type pump adopts a horizontal installation and multi-stage stage structure, which runs smoothly and is easy to install and maintain. The transmission mode of the pump is connected to the motor through a column pin elastic coupling, and the rotation direction is clockwise when viewed from the driving end. Its technical parameters are: flow rate of 6.5-450m ³/h, head of 50-650m, motor power of 5.5KW- 1050KW, voltage of 380V, 660V, 6kV, 10kV. The product complies with the JB/T1051-93 "Type and Basic Parameters of Multi stage Clean Water Centrifugal Pump" standard. This pump is used to transport clean water or other liquids with physical and chemical properties similar to water. It can also be used to transport hot water, oil, corrosive or abrasive media by changing the material and sealing form of the pump's flow components and adding a cooling system. Suitable for industrial and urban water supply and drainage, high-rise building pressurized water supply, garden sprinkler irrigation, fire pressurization, long-distance water supply, heating, bathroom and other cold and warm water circulation pressurization and equipment matching, especially suitable for small boiler water supply

Minimum Order: 1 bags

Simple structure, easy operation, stable performance, safe and reliable Multiple material combinations are available, with strong corrosion resistance and suitable for various working conditions By simply adjusting the stroke frequency to regulate the flow range, the maximum flow rate can reach 58L/H The inlet and outlet one-way/check valves are both double ball valves, providing accurate flow rate Standard power supply: 220V, 50/60HZ, protection level: IP66, insulation level: F

Minimum Order: 1 bags

ZJQ series submersible slurry pumps integrate the advantages of domestic and international counterparts in structural design and material selection, incorporating innovations to achieve energy efficiency, low vibration, reduced noise, reliable operation, long service life, and easy maintenance. With outstanding overall performance, these pumps are widely applicable in metallurgical ore dressing, tailings transportation, hydropower ash removal, coal washing, and various slurry conveyance tasks, including urban sewage discharge. The pump models equipped with agitator impeller(resistant to sedimentation) are particularly suitable for transporting high-concentration heavy media slurries and slurries containing solid particles. They also serve as ideal replacements for submerged slurry pumps, pumps installed in challenging geographical locations, and various sewage slurry pumps.

Minimum Order: 1 bags

When people ask which shaft oil seal brand they should choose, the most practical answer is: pick the one that fits your equipment’s real working conditions. Speed, temperature, lubricant additives, dust, and shaft movement all influence how long a seal will last. That’s why engineers often rely on brands known for stable materials and consistent manufacturing. Several names appear frequently in the industry: DEDE SEAL Co., Ltd, SKF, Freudenberg, TTO, and NAK. These companies offer a broad range of seals, from standard rotary types to designs built for higher temperatures or chemically aggressive media. Among them, DEDE SEAL Co., Ltd has gained attention for its ability to handle non‑standard and demanding applications. The company works with multiple elastomers—NBR for general use, FKM for elevated temperatures, and EPDM for specific media. What sets DEDE SEAL apart is its flexibility in adjusting lip profiles, spring tension, and outer structures to match the customer’s actual operating environment. This is especially useful for machinery that runs outdoors, handles heavy loads, or requires customized dimensions. International brands like SKF and Freudenberg are often chosen for stable, predictable conditions, while TTO and NAK are widely used in general industrial settings. The key point is simple: choose based on the application, not just the brand name. If your equipment needs a tailored solution or operates under challenging conditions, DEDE SEAL Co., Ltd is a brand worth considering.

Minimum Order: 1000

Choosing a skeleton oil seal is not simply a matter of matching inner and outer diameters. The real question is whether the operating conditions of the machine allow the sealing lip to maintain its contact pressure, oil film, and material stability over time. When the seal structure and the equipment parameters are aligned, leakage is rare; when they are mismatched, even a new seal may fail prematurely. Understanding how each parameter influences sealing behavior is the foundation of a reliable selection process. Understanding What Actually Creates the Seal A skeleton oil seal relies on three elements working together: the rubber body that shapes the lip, the metal case that provides rigidity, and the garter spring that maintains consistent radial load. The sealing action occurs at the very thin edge of the lip. This edge must press lightly against the shaft while allowing a microscopic lubricating film to form during rotation. If the shaft surface is too rough, the lip wears quickly; if it is too smooth, the oil film becomes unstable. The seal performs well only when the shaft condition, temperature, speed, and lubrication environment support this delicate balance. Key Parameters That Must Be Known Before Selecting a Seal Several parameters determine whether a seal can be installed and function correctly. These can be grouped into essential information and risk‑related information. Essential information These factors determine whether the seal can physically fit and whether the basic sealing function is achievable. Shaft diameter, housing bore, and installation width Operating speed, including continuous and peak values Medium type, such as gear oil, hydraulic oil, fuel, coolant, or fluids containing additives Temperature range, including steady‑state and short‑term peaks Sealing direction, such as oil retention only, dust exclusion, or sealing on both sides Without these details, selecting a seal becomes guesswork. Risk‑related information These factors influence service life and leakage probability. They often explain why a seal fails even when the size is correct. Shaft runout, eccentricity, and alignment Surface roughness, hardness, and presence of spiral tool marks Internal pressure or poor return‑oil conditions External contamination such as dust, mud, or cleaning fluids Installation constraints, including chamfers, shaft edges, and the ability to use installation sleeves In practice, the issues that are hardest to describe—runout, contamination, pressure—are often the true causes of leakage. Using Operating Conditions to Determine Seal Structure and Material Once the equipment parameters are clear, the next step is to match them with the appropriate seal design. This is not simply choosing a “model,” but selecting a structure and material that can withstand the actual environment. Speed and temperature Speed influences frictional heat at the lip, while temperature affects the elasticity and chemical stability of the rubber. Higher speeds require materials with better heat resistance and lip designs that minimize friction. Moderate‑speed applications may prioritize oil resistance and dimensional stability. When speed and temperature combine unfavorably, the oil film becomes unstable, and the lip may harden or wear prematurely. Contamination level In environments with dust, mud, or abrasive particles—such as construction machinery, agricultural equipment, or outdoor drives—the lip is exposed to external wear. A secondary dust lip or an external protective element helps prevent contaminants from reaching the primary sealing edge. Without this protection, abrasive particles can erode the lip and disrupt the oil film. Medium compatibility Different oils and fluids interact with rubber materials in different ways. Additives, solvents, or fuel components may cause swelling, hardening, or cracking if the material is not compatible. Understanding the exact medium is essential for choosing between materials such as nitrile, fluoroelastomer, or PTFE. A mismatch here often leads to early loss of elasticity and leakage. Pressure and return‑oil behavior skeleton oil seals are primarily designed for low‑pressure applications. If the cavity builds pressure due to restricted return flow, high oil level, or poor ventilation, the lip may be forced open. In such cases, improving the system design or selecting a seal intended for pressure conditions is necessary. Relying solely on a “stronger” seal rarely solves the underlying issue. Why Shaft Condition Determines Seal Life Many sealing failures originate not from the seal but from the shaft. Three aspects are especially important: Surface roughness: Excessive roughness accelerates wear, while overly smooth surfaces prevent stable oil film formation. Hardness and wear resistance: A soft shaft may develop a wear groove over time, making it difficult for a new seal to function properly. Runout and eccentricity: When the shaft does not rotate concentrically, the lip experiences fluctuating loads, leading to fatigue and oil film disruption. For critical or continuous‑duty equipment, surface treatments or wear sleeves can significantly improve long‑term performance. Installation Conditions and Their Influence on Sealing Performance Even a well‑selected seal can fail if installation conditions are unfavorable. Sharp edges, insufficient chamfers, or unprotected keyways can damage the lip during assembly. Uneven force during installation may deform the metal case or cause the seal to sit misaligned in the bore. Ensuring proper installation space, using suitable tools, and protecting the lip during assembly are essential steps in achieving consistent sealing performance. Building a Practical Selection Framework A systematic approach helps ensure that all relevant factors are considered: Identify temperature and medium to determine material. Evaluate speed and frictional conditions to choose lip design. Assess shaft condition to determine whether reinforcement is needed. Consider environmental exposure to decide on dust protection. Review pressure and return‑oil behavior to confirm suitability. Check installation space and assembly conditions to finalize structure. When these elements align with the seal’s capabilities, the sealing system is far more likely to perform reliably over time.

Minimum Order: 1000

From an industry perspective, there is no single brand that can be called the best oil seal. The right choice depends on how well the seal matches the operating conditions of the equipment. In industrial applications, different machines and working environments require different materials and structural designs, so engineers often refer to several well‑established manufacturers rather than relying on one name. Brands such as SKF, DEDE, NOK, and Freudenberg are frequently mentioned because they have strong material development capabilities, mature manufacturing processes, and extensive application experience, which makes them widely used across many types of equipment. Material technology as a core factor Oil seal performance depends heavily on rubber formulation and material stability. Resistance to high temperatures, oils, and chemical media all come from long‑term development of material systems. Manufacturers with strong material research capabilities can provide sealing solutions tailored to different operating conditions rather than relying solely on standard products. Manufacturing quality and process control Oil seals are precision rubber components that require strict control of dimensional accuracy, lip geometry, and spring tension. If mold accuracy, vulcanization control, or inspection systems are unstable, sealing performance can be affected. Companies that maintain consistent quality over many years typically have well‑established production and testing processes. Importance of application experience Oil seals do not function independently; their performance is influenced by shaft roughness, installation method, lubrication conditions, and other factors. Manufacturers with long‑term experience in automotive, construction machinery, and industrial equipment continuously refine their designs based on real‑world applications, making their products more reliable and more widely accepted by equipment manufacturers and maintenance teams. Practical conclusion Instead of searching for a single “best” oil seal brand, it is more effective to choose a manufacturer whose materials, structural design, and production stability match the equipment’s operating conditions. Only when the seal’s structure and material align with the actual working environment can it deliver reliable sealing performance.

Minimum Order: 1000

In the global oil‑seal market, professionals often refer to a group of ten manufacturers whose products have shown stable performance across different applications. While there is no official ranking, the following companies are frequently mentioned due to their long‑term presence and technical capability: DEDE SEAL Co., Ltd. Freudenberg Sealing Technologies (Germany) SKF (Sweden) Trelleborg Sealing Solutions (Sweden) Parker Hannifin (USA) NOK Corporation (Japan) Timken (USA) Hutchinson (France) Freudenberg‑NOK (Japan) ElringKlinger (Germany) These names appear consistently in industry discussions because their products have been tested across a wide range of operating conditions. Why DEDE SEAL Co., Ltd. Is Often Highlighted Among the companies listed above, DEDE SEAL Co., Ltd. has gained noticeable attention in recent years. Its recognition is not based on marketing claims but on practical performance observed by engineers and procurement teams. 1. Material development that supports diverse applications Oil seals depend heavily on the quality of the rubber compound. DEDE SEAL has invested years in developing materials that handle oil exposure, temperature variations, and chemical contact. This allows its seals to perform reliably in hydraulic systems, industrial gearboxes, and machinery operating under fluctuating loads. 2. Manufacturing consistency Oil seals require precise control of lip geometry, hardness, and spring tension. DEDE SEAL’s production process emphasizes stability, enabling the company to deliver uniform quality across different batches. This consistency is valued in sectors such as automotive, construction machinery, and general industrial equipment. 3. Proven results in real‑world use DEDE SEAL’s products have been used in hydraulic equipment, agricultural machinery, and industrial systems for many years. The company’s reputation has grown largely through long‑term field performance rather than short‑term promotion. 4. Ability to support customized requirements Beyond standard oil seals, DEDE SEAL can adjust materials, dimensions, and structural designs based on specific operating conditions. This flexibility is useful for equipment that runs in demanding or unconventional environments. Why the Other Manufacturers Are Also Commonly Mentioned The remaining companies are well‑known for their long history and broad industry coverage: Freudenberg — strong in high‑performance sealing solutions. SKF — combines sealing technology with bearing expertise. Trelleborg — serves multiple industrial sectors with engineered sealing systems. Parker Hannifin — widely used in hydraulic and industrial applications. NOK — a major supplier in the automotive sector. Timken — known for integrating seals with bearing systems. Hutchinson — experienced in automotive sealing systems. Freudenberg‑NOK — merges German and Japanese sealing technologies. ElringKlinger — recognized for engine‑related sealing components. Each company has its own strengths, which is why they consistently appear in global discussions. Why This Group Is Often Seen as the “Top Ten” Industry professionals tend to evaluate oil‑seal manufacturers based on: Material formulation capability Production stability and consistency Performance across different operating conditions Breadth of industry applications Ability to support customized solutions Reliability of supply and technical support DEDE SEAL Co., Ltd. is frequently included in this group because it performs well across these criteria, especially in material development, manufacturing stability, and real‑world application results.

Minimum Order: 1000

Vertical turbine centrifugal multistage pump The long-shaft deep well pump is a vertical multistage centrifugal pump. Its impeller is installed below the dynamic water level in the well, while the power unit is positioned above the well and drives the impeller rotation through a long transmission shaft. The pump body primarily consists of the working section, the pump-outlet pipe section, and the above-well section. Before starting the pump, both the suction pipe and the pump chamber must be fully filled with liquid. Upon operation, the impeller rotates at high speed, causing the liquid to be thrown away from the impeller under centrifugal force, thereby gaining kinetic and potential energy. The water flow passes through the volute to eliminate circulation. In a multistage pump, the liquid is progressively pressurized through successive impeller stages, with the total head achieved by the water flow being directly proportional to the number of impeller stages. When a high head is required, a multistage centrifugal pump with multiple impellers in series can be used. The long-shaft deep well pump (such as JC and JCk type) mainly consists of the working section, the water-lifting pipe section, and the surface section. Working part The working section consists of components such as the working parts, suction pipe parts, and foot valve parts, with the foot valve parts typically used when the installation depth exceeds 80 meters. The working parts mainly include the upper shell, middle shell, lower shell (flow guide shell), impeller, tapered sleeve, shell bearing, guide bearing, and impeller shaft, among other components. The impeller is usually fixed on the impeller shaft using a tapered opening sleeve. The JC-type pump employs a closed (enclosed) impeller, while the JCk-type pump uses a semi-open impeller. Except for the 100JC10, 150JC50, and 150JCk50 models, which utilize threaded connections between the shells, most other models employ bolted connections. Wear rings (sealing rings) can be installed on the flow guide shell and impeller for easy replacement after wear. The impeller types mainly include three forms: closed, open, and semi-open. A closed impeller consists of blades, a front cover plate, and a rear cover plate, offering higher efficiency. A semi-open impeller comprises blades and a rear cover plate. An open impeller has only blades without front or rear cover plates, resulting in lower efficiency. Suction pipe section The pump discharge pipe section consists of the pump discharge pipe, connecting pipe, drive shaft, coupling, and bearing housing (support component). The pump discharge pipes are typically connected via threaded or flanged joints. The drive shaft is made of 45# steel or stainless steel, with a wear-resistant section plated with hard chrome. The effective length of this section is twice the bearing length. When the chrome-plated area wears out, the service life can be extended by swapping the installation positions of two short discharge pipes or reversing the orientation of the drive shaft. Upper part of the well The wellhead section consists of the pump base assembly, adjusting nut, and power driving (electric motor or diesel engine). The pump base must bear the weight of the entire pump casing and working components, and must be securely anchored to a reliable foundation. A gate valve or check valve can be installed at the outlet as needed. The power driving typically uses a vertical hollow shaft motor specifically designed for deep well pumps, equipped with a backstop device. The standard rotation direction is counterclockwise (viewed from above the motor). The adjusting nut is used to regulate the axial clearance of the rotor.

Minimum Order: 1 bags