Tools & Hardware

　　Oil seals are critical components in mechanical systems, serving essential roles across various industries, from industrial machinery to household appliances. But what materials are oil seals made from, and what specific functions do they serve? Let’s explore. 　　Common Oil Seal Materials 　　The selection of oil seal materials depends on the operational environment and requirements. Common materials include: 　　Nitrile Rubber (NBR): Suitable for temperatures between -40°C and 125°C, offering good oil resistance and wear properties. 　　Fluororubber (FKM): Known for its high-temperature resistance, FKM works in temperatures from -20°C to 250°C, ideal for high-heat environments. 　　Silicone Rubber (VMQ): Offers a wide operating temperature range from -60°C to 225°C, excelling in low-temperature conditions. 　　Acrylic Rubber (ACM): Resists heat and oil well, functioning in temperatures from -25°C to 150°C. 　　Polyurethane (PU): Exhibits excellent wear resistance, suitable for moderate environments with temperatures between -20°C and 120°C. 　　Polytetrafluoroethylene (PTFE): Renowned for its outstanding chemical and temperature resistance, PTFE operates between -65°C and 260°C. 　　Functions of Oil Seals 　　The primary function of oil seals is to prevent the leakage of lubricating oil, ensuring efficient lubrication between mechanical parts. Additionally, they block external contaminants like dust or dirt from entering the machinery, thereby enhancing performance and extending the lifespan of the equipment. 　　Applications of Oil Seals 　　Automotive and Motorcycle Engines: Oil seals are used to seal crankshafts and camshafts, preventing oil leakage in the engine. 　　Agricultural and Construction Equipment: Oil seals play a crucial role in sealing transmission systems in machinery such as excavators and bulldozers. 　　Industrial Gearboxes: Oil seals ensure proper lubrication in gear systems, reducing wear caused by friction during operation. 　　Hydraulic Systems: Oil seals maintain the stability of hydraulic components, such as pumps and motors, by preventing hydraulic fluid leakage and ensuring optimal performance. 　　In conclusion, oil seals are indispensable in modern machinery. Their proper application not only enhances the efficiency of equipment but also extends its operational life, ensuring long-term reliability and stability.

Minimum Order: 1000

Compression EVA mold for footwear. The mold material is the aluminium. The maintain basic CM mold life is 20K pairs per set mold (average by one year continually production).

Minimum Order: 1 bags

Injection plastic mold (TPU mold) for footwear. The mold material is the steel. The maintain basic plastic mold life is 200~300K pairs per set mold (at least 2~3 years).

Minimum Order: 1 bags

Rubber mold for footwear. The mold material is the mold steel. The maintain basic mold life is 20k pairs per set mold (average by one year continually production).

Minimum Order: 1 bags

Injection EVA mold for footwear. The mold material is the aluminum or steel. The maintain basic IM mold life is 20K pairs per set mold (average by one year continually production).

Minimum Order: 1 bags

Popcorn mold for footwear. The mold material is the aluminium. The maintain basic Popcorn mold life is 20K pairs per set mold (average by one year continually production).

Minimum Order: 1 bags

Valve Size: DN40-DN1200.  Pressure Rating: PN10-PN250. Material:GS-C25;1.0619;GP2 , 40GH,1.4308;1.4408,1.4571,1.4581,S31803 and Other Alloy Steel Design & Manufacture: DIN EN 12516-1;BS EN 12516.1;BS EN ISO 10434,EN1984 Face to Face Dimension: DIN EN558-1,EN12982 Flange Ends Dimension:EN1092 Test & Inspection:EN12266 End: RF,RTJ,BW Drive Device: Handwheel,Chainwheel,Bevel Gear;Electrical & Pneumatic Actuator Features Leflow provides high performance gate valve products, including Wedge gate valve, Pressure seal gate valve, Knife gate valve, Flat gate valve and Bellow seal gate valve. The OS&Y stem is most popular, but Non-Rising Stem type is also in our scope. Both flexible and Solid disc are available. For big size or Big pressure valve, By-pass design is optional.Below seal gate valve also falls in our ability. A gate valve, known as a sluice valve, is a valve that opens by lifting a barrier (gate) out of the path of the fluid. When fully open, the typical gate valve has no obstruction in the flow path, resulting in very low flow resistance. The size of the open flow path generally varies in a nonlinear manner as the gate is moved. This means that the flow rate does not change evenly with stem travel. CAST STEEL GATE VALVE-DIN is usually for working condition in which the valve is not opened or closed frequently, and supports gate fully open or fully closed. It’s not suitable for adjustment or throttling. Gate valve includes three types-Wedge gate, Knife Gate and Parallel Gate. The disc of Wedge gate valve comes with Solid Type and Flexible Type. Flexible Wedge Gate Valves design consists of two independent and flexible wedge halves, that allow a relative movement to accommodate changes in the body seat angles. Solid wedge is designed in one-piece model while flexible wedge offers a wedge shape for both seats.

Valve Size:  DN25 – DN1000  Pressure Rating: PN10 Material: Ductile Iron(GGG50),Aluminum, WCB and Stainless Steel Operation: Manual, Pneumatic and Electric; Ends Dimension:DIN2533 BS4504,JIS B2212,ANSI B16.5 Test & Inspection: EN12266, API 598 Leflow’s high quality Pinch Valve is the ideal solution for shutting off and controlling abrasive, corrosive and fibrous media such as emulsions, silt, dust,gaseous substances, compressed air, powdery materials and particles. It has following options: 1.Body can be made of Ductile Iron, WCB,Aluminium and other Stainless Steel; 2.Operation can be Manual, Pneumatic and Electric; 3.Sleeve can be made of EPDM,NBR,NR(Natural Rubber) and so on. Pinch valve, also known as pressure valve,is a valve that uses manual, pneumatic, electric and other driving methods to squeeze the internal rubber tube to On-off or regulate the flow. Pich valve is composed of upper and lower valve body, rubber sleeve, Upper and lower stem, upper and lower gate, left and right guide post and other parts; As the core component, the rubber sleeve is usually composed of an inner layer, an outer layer and a reinforcing fiber, and is formed by vulcanized rubber. Common rubber sleeve materials are natural rubber, fluorine rubber, neoprene rubber ball, EPDM rubber, nitrile rubber, food grade rubber ball and so on. When the hand wheel is rotated clockwise, the size of the pinch valve stem simultaneously drives the upper and lower valve plates to compress the rubber sleeve, and the valve is closed. When it is turned anti-clockwise, the valve is opened due to the joint action of the elasticity of the rubber sleeve and the pressure of the medium. The gate moves up and down between the left and right guide to complete the valve opening and closing; During the closing, Once it feels the connection between upper and lower sleeve, then stop continuing to close, More torque will damage the sleeve. The Pinch valve can be installed in any direction on the pipe, and there is no medium flow limit. After using for a long time, if the rubber sleeve is found to be worn and leak happens, just disassemble the upper and lower valve body and replace it with a new rubber sleeve. The valve body can be reused and the maintenance cost is very low. Manual Pinch Valve Leflow’s Manual Pinch Valve is a reliable, low-maintenance, and cost- effective valve designed for challenging slurry, abrasive, and corrosive chemical applications across various industries. The 100% full bore design eliminates any dead points or gaps, seats, or bearings where slurries might stagnate and affect operation, or even lead to valve failure. The manual pinch valve features a bi-directional drip-tight closing function, and its design meets face-to-face dimensions identical to gate valves, plug valves, and ball valves (DN25 – DN1000). They are designed with flange connections conforming to EN12266, API 598 standards, or DIN2533 BS4504, JIS B2212, ANSI B16.5.

Valve Size:  DN15 – DN600  Pressure Rating: PN6,PN10,PN16  Material: Cast Iron(GG25) and Ductile Iron(GGG40 and GGG50). Test & Inspection: EN12266 Face to Face Dimension(Flanged): DIN3202 F6 End: BSP acc.to ISO228-1, Flange EN1092-2 PN16 and AS4087 Features: Leflow’s is manufacturing ball check valve with Flanged and Screwed ends, and options are as following: 1.DN15 to DN50 can be Screwed, and DN40 to DN600 are commonly flanged ends; 2.The coating of ball can be NBR or EPDM; 3.All sizes of valves are Fusion bonded epoxy coated; 4.Full bore for all sizes; The cast iron check valve is usually used to control the one-way flow of fluids. It usually consists of a valve body, ball, spring, and sealing components.This kind of valve is suitable for medium and small diameter pipelines and widely used in industrial systems such as water supply, drainage, heating, and cooling. Its main characteristics are as following: 1.Simple and compact structure: fewer components, easy to install and maintain; 2.Low Pressure drop, Minimum backpressure for tightness 0.3bar; 3. Quick close:The check valve can quickly close when the fluid flow direction changes, preventing backflow and protecting the safe operation of the pipeline system; 4. Good sealing performance: The ball is encapsulated with soft rubber, which can achieve Zero leak; 5. Silent operation the sound of ball touching the seat is very small,as soft rubber covering the ball; 6. The ball can self-Cleaning; 7. Horizontal and vertical installation in the pipeline 8. Keep valve on Pipeline to change ball or clean valve interior

Size: 1/2”- 10”.  Pressure Rating: CLASS 150 Body Material: Cast Iron(ASTM A126-B) and Ductile Iron(ASTM A536) Operation: Lever, Worm Gear, Electrical, Pneumatic, Hydraulic  Design: ANSI B16.1 Face to Face: ANSI B16.10 Test: API 598 Features: Leflow’s ANSI Cast Iron Ball valve is 2pc type, End can be flange and thread, 125LBS and 150LBS rating. ASTM A126-B body ball valves can be used in many industries like water distribution networks, food and pharmaceutical plants, water treatment, power plants and so on. 1.The stainless steel ball & stem and sealing mechanism ensures the valve for long life usage. 2.It is advised to be used either at fully open or fully closed position. 3.The Cast Iron ball valves open/close position can be easily observed from the position of handlever easily. 4.PTFE sealing provides long service life with zero leakage rates. 5.The valves are designed for bidirectional usage. 6.Through its full bore design, pressure loss is almost at zero point. 7.By adding an ISO top flange, the valve operation can be maintained by gearbox, pneumatical or electrical actuator. 8.The valves are Anti-static and blowout-proof designed. 9.Extension Stem is also optional.

Features: Leflow’s U-type flange butterfly valve includes several types: The body can be made of GG25, GGG50,WCB,CF8,CF8M,Aluminium-bronze and so on; Split body type is also available. Flange hole can be ANSI 150/PN10/PN16/JIS 5K/JIS10K; Disc type: Through shaft with pin, Through shaft without pin and stubbed Shaft; Disc Material:DI+Nickle/CF8/CF8M/Aluminium Bronze/DI+PTFE Seat Material: NBR/EPDM/PTFE?VITON Stem material: SS410/SS416/SS420/SS304/SS316 The center line butterfly valve controls the flow by turning the gear or hand wheel to make the valve disc perpendicular to the direction of the fluid. It is mainly suitable for the control of liquid, gas and gas-liquid mixture under ordinary working conditions. The characteristics of middle line butterfly valve: 1.Various disc and Seat materials can be used in different application. 2.Compact dimensions offers the advantages of lightweight, easy installation and cost effectiveness. 3.Head loss is at minimum level through the double shaft design 4.The outer surfaces of valve body are coated with fusion bonded epoxy. 5.Smooth operation and longer life is maintained in tough conditions. 6.Top flange conform to ISO 5211, Gear box and actuator can be installed directly. 7.Maintenance-free. 8.Simple structure, small size, easy installation and maintenance,strong adaptability. https://www.leflowvalves.com/ ,

Name: Double eccentric butterfly valve Another name: High performance butterfly valve Applicable: Water plant, power plant, steel plant smelting, chemical industry Features: Longer life and good stability Features: Leflow is providing high quality Double-offset butterfly valve. We produce double eccentric butterfly valves with diameters ranging from DN100 to DN1200. Double offset uses two separate offsets to achieve a bubble-tight. One of the offsets is the location of the valve shaft relative to the centerline of the bore. Another offset is between the centerline of the disc/seat sealing surface and the shaft. This structure make the valve has following benefits: 1. Double Eccentric structure ensures low operating torques with zero leakage performance; 2. Inner and outer surfaces of the valve are coated with fusion bonded epoxy,and Its thickness can be adjustable; 3. Low moments are obtained by decreasing the friction through self-lubricating bushings; 4. Can bear high stretching stresses on the pipeline through the ductile iron body and disc; 5. High impact resistance. 6. Pressure loss is at minimum level by double shaft design. 7. Sealing gaskets fasten by bolt can be replaced at field condition; 8. With the o-rings on the bearing bushings, disc pin holes are protected against corrosion (Dry shaft); 9. Retaining ring is assembled to the disc with imbus bolts, the disc is protected against corrosion by placing o-rings under the bolts. 10. Stainless steel welding seat can reach better sealing

　　Fitting oil seals over shafts is a critical process in ensuring the longevity and efficiency of mechanical systems. Proper installation prevents leaks, reduces wear, and maintains the integrity of the machinery. This article explores the essential steps and considerations when fitting oil seals over shafts from multiple perspectives. 　　Preparation 　

Minimum Order: 1000

　　EC end cap seals are specialized sealing components commonly used in various industrial applications, designed to provide a secure seal at the ends of rotating shafts and cylindrical housings. They play a critical role in maintaining the integrity of mechanical systems by preventing the leakage of fluids and gases, while also protecting against the ingress of contaminants like dust and dirt. This article will explore the function, materials, applications, and advantages of EC end cap seals to offer a comprehensive understanding of their importance in modern machinery. 　　1. Function and Importance 　　The primary function of an EC end cap seal is to create a reliable seal between rotating shafts or fixed housings and their surrounding environment. By doing so, these seals ensure that vital fluids such as lubricants and coolants stay within the system while preventing external contaminants from entering and causing damage. Without proper sealing, machinery components can wear down faster due to friction and contamination, leading to operational inefficiencies and increased maintenance costs. Thus, EC end cap seals play an essential role in extending the lifespan and reliability of equipment. 　　2. Material Composition and Selection 　　EC end cap seals are typically made from materials that are highly resistant to wear, heat, and chemical exposure. Common materials used in the construction of these seals include nitrile rubber (NBR), fluorocarbon (FKM), silicone, and polytetrafluoroethylene (PTFE). Each material offers different advantages based on the operating conditions. For example, FKM seals are known for their resistance to high temperatures and harsh chemicals, while silicone seals excel in low-temperature environments where flexibility is crucial. The choice of material will depend on factors such as operating temperature, pressure, and exposure to chemicals or abrasive substances. 　　3. Applications of EC End Cap Seals 　　EC end cap seals are used in a wide range of industries, from automotive to aerospace, as well as in heavy machinery and manufacturing equipment. In the automotive sector, these seals are often found in transmission systems, wheel hubs, and gearboxes, where they help to maintain the efficiency of lubricants and prevent leaks. In industrial settings, EC end cap seals are crucial for machinery such as pumps, compressors, and motors, where they help protect sensitive components from environmental contaminants. Their ability to handle both dynamic and static sealing makes them versatile in many applications. 　　4. Advantages of EC End Cap Seals 　　The main advantage of EC end cap seals is their ability to provide long- lasting sealing performance under demanding conditions. These seals are designed to endure high levels of pressure and temperature while maintaining their integrity over time. They also offer excellent resistance to wear and chemical attack, making them ideal for applications in harsh environments. Additionally, their design allows for minimal friction during operation, which helps to reduce energy consumption and enhance the efficiency of the machinery. 　　Understanding the specific needs of a given application and selecting the right EC end cap seal can significantly improve the longevity and efficiency of industrial equipment, making them an indispensable component in modern mechanical systems.

Minimum Order: 1000