Mechanical Hardware

　　Oil seals play a crucial role in mechanical systems, effectively preventing contamination and ensuring that lubricants remain within the system. With a variety of types and materials available, selecting the appropriate oil seal for your machinery is essential for optimal performance and safety. Here are some guidelines to help you choose the best oil seal for your needs. 　　The fundamental structure of an oil seal includes a metal ring serving as the internal skeleton. The exterior can be crafted from metal or rubber materials, depending on the specific application. Springs are situated on the seal’s edge to support the seal and prevent the leakage of lubricants and other contaminants. The materials used in oil seals range from silicone and fluoroelastomer to PTFE. 　　The primary component of the oil seal is the lip, which creates a seal when pressed against the shaft’s surface. Oil seals can be equipped with or without a spring. The spring helps maintain pressure on the shaft, whereas oil seals without springs are primarily designed to keep dust out. 　　NQKSF oil seals are engineered to meet the rigorous demands of the industrial sector. They are utilized in hydraulic systems, pumps, pistons, pipelines, and various other mechanical devices. These seals are indispensable for the functioning of equipment that involves rotating parts, such as shafts and bearings. 　　Recognized for their exceptional performance across numerous applications, NQKSF oil seals offer high-quality products and comprehensive support for sealing systems. Customers can reach out to local distributors for expert guidance and assistance.

Minimum Order: 1000

　　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

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

　　Skeleton oil seals essential components in various mechanical applications, serve to contain lubricants and exclude contaminants from machinery. Their effectiveness is significantly influenced by the environment in which they are stored. Understanding the requirements for the storage environment of skeleton oil seals is crucial for ensuring their longevity, performance, and reliability. 　　1. Temperature Control 　　One of the primary considerations for storing skeleton oil seals is temperature. Extreme temperatures, whether hot or cold, can degrade the materials from which these seals are made. Ideally, they should be stored in a controlled environment where temperatures range between 15°C and 25°C. Higher temperatures can cause rubber components to harden and lose their elasticity, while low temperatures can make them brittle. Maintaining a stable temperature helps preserve their structural integrity. 　　2. Humidity Levels 　　Humidity also plays a vital role in the preservation of skeleton oil seals. Excessive humidity can lead to mold growth and degradation of the sealing material, while insufficient humidity can cause drying and cracking. The relative humidity of the storage area should be monitored and maintained between 30% and 50%. Using dehumidifiers or humidifiers, as required, can help stabilize these levels. 　　3. Protection from Contaminants 　　It is essential to protect skeleton oil seals from exposure to harmful chemicals and contaminants. They should be stored in a clean, dry environment away from strong solvents, oils, and other chemicals that could compromise their integrity. Ideally, seals should be wrapped in protective material and kept in sealed containers to prevent environmental damage. 　　4. Avoiding Physical Damage 　　Physical handling and storage of skeleton oil seals are critical to their preservation. They should be laid flat and not stacked directly on top of each other to avoid deformation. The use of racks or shelves that prevent excessive pressure and allow for easy access is recommended. Furthermore, it’s essential to handle them with clean, dry hands or gloves to prevent transfer of oils and dirt. 　　5. Periodic Inspection 　　Regularly inspecting the storage environment and the seals themselves ensures any potential issues can be addressed promptly. Noticing signs of swelling, discoloration, or cracks can help prevent the use of compromised seals, which could lead to equipment failure. Setting a schedule for inspection helps maintain both the seals and the overall storage conditions. 　　Adherence to these environmental requirements for skeleton oil seals not only extends their lifespan but also ensures optimal performance when installed in machinery. As industries continue to innovate and evolve, understanding the science behind material preservation will play an increasingly crucial role in achieving operational excellence. Thus, investing in appropriate storage solutions could be a key differentiator, impacting productivity and cost- effectiveness.

Minimum Order: 1000

　　Oil seals play a critical role in the functioning and longevity of mechanical equipment. These seals, typically made from rubber or elastomeric materials, are designed to keep lubricants contained and prevent dirt, dust, or moisture from entering machinery compartments. While they may seem like simple components, their importance cannot be overstated. 　　1. Preventing Lubricant Leakage 　　One of the primary functions of oil seals is to prevent the leakage of lubricants. In any mechanical system, lubricants are essential for reducing friction between moving parts, thereby minimizing wear and tear. A well- functioning oil seal ensures that these lubricants remain where they are needed, avoiding costly spills and maintaining optimal operating conditions. Without effective sealing, lubricants can escape, leading to insufficient lubrication, increased friction, overheating, and ultimately, mechanical failure. 　　2. Shielding Against Contaminants 　　Alongside retaining lubricants, oil seals serve as barriers against contaminants such as dirt, dust, and moisture. Contamination can severely damage components within machinery, leading to decreased efficiency and potential breakdowns. For instance, in automotive applications, dirt and moisture can infiltrate critical areas, causing corrosion and severe wear on bearings and other vital parts. A robust oil seal protects these components, ensuring a longer operational life and reliability of the machinery. 　　3. Enhancing Efficiency and Performance 　　Well-designed oil seals contribute to the overall efficiency and performance of mechanical equipment. They maintain the correct levels of lubrication and protect against contaminants, which can enhance the overall effectiveness of the machinery. By facilitating smoother operation, oil seals help reduce energy consumption, thereby contributing to cost savings for industrial operators. For instance, in processing plants, efficient seal performance can lead to significant reductions in operational costs and downtime, improving productivity. 　　4. Varieties of Oil Seals 　　Oil seals come in various types and materials, each suited for specific applications. Common types include lip seals, rotary seals, and radial seals, with materials ranging from rubber to more sophisticated thermoplastics. Each design serves different needs; for example, lip seals are ideal for applications involving rotating shafts, while static seals may be employed in non-moving joints. This variety ensures that mechanical engineers can choose the most suitable seal for their specific operational contexts, further enhancing the effectiveness and durability of their equipment. 　　Oil seals are not merely accessories in mechanical equipment; they are vital components that support operational efficiency, protect against contamination, and prevent lubricant loss. As technology evolves, so too do the designs and materials used in oil seals, making them more effective than ever. As engineers and manufacturers continue to prioritize the importance of these seals, understanding their critical role will ensure the reliability and longevity of machinery across various industries.

Minimum Order: 500

Basic product information Product Name: Solenoid Ball Valve M-3SEW10   Product attributes Brand: Huade Hydraulic Model: M-3SEW10 Certificate: ISO9001-2008 Origin: China   Custom properties Type SEW directional valve is a solenoid-operated steel ball directional valve. Used to control the start, stop and flow direction of the oil.   Features of solenoid actuated ball valve - Direct actuated directional poppet valve,solenoid actuated - Closed port is leak-free - Switching is ensured even after long periods of being under pressure - Air gap DCsolenoids with removable coil (AC volt-ages possible via rectifier) - Solenoid coil can be rotated by 90 degree - lndividual electrical connection - With protected hand override, optional - Porting pattern to Din 24 340 form A, ISO 4401 and CETOP-RP 121H   Huade Hydraulic Technology Co., Ltd. was established in 2008 and is located in Shijiazhuang, the capital of Hebei Province. It is a professional enterprise specializing in the production and sales of a full range of hydraulic industry products. our products include directional valve, pressure valve, proportional valve, flow valve and throttle valve etc. Sincerely hope to cooperate with you!

Product name: Cartridge check valve M-SR8. M-SR10. M-SR10. M-SR15. M-SR20. M- SR25. M-SR30 A Cartridge Check Valve, also known as a Cartridge Type Check Valve, is a type of hydraulic valve that is designed to allow fluid to flow in only one direction. This valve is typically used in hydraulic systems where backflow prevention is critical.   Cartridge Check Valve Features 1. Cartridge Check Valve has compact design. Unlike traditional check valves, which are typically bulky and require a lot of space, Cartridge Type Check Valves are designed to fit into small spaces. This makes them ideal for use in applications where space is at a premium. 2. Cartridge Check Valve is easy to install. Because these directional valves are designed to be inserted directly into hydraulic lines, they can be easily installed or replaced without the need for extensive modifications to the system.   Cartridge Check Valve Applications Cartridge Check Valves are used in a variety of applications, including in hydraulic presses, industrial machinery, and mobile equipment. They are often used in systems that require fast and accurate response times, as well as in systems where precise pressure control is essential. As a leading cartridge check valve supplier, Huade provides various check valves for your choice. Welcome to contact us for more information!