Hydraulic
Seals are key components in hydraulic systems to prevent oil leakage and ensure the normal operation of the system. They are widely used in the hydraulic industry.
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Hydraulic pump
l Axial piston pump: A flat seal is often used between the valve plate and the cylinder of the pump. Through high-precision processing and appropriate preload, the valve plate and the cylinder are tightly fitted to prevent oil leakage between the high and low pressure chambers. A plunger seal ring is used between the cylinder and the plunger, usually an O-ring or a combined seal ring, to prevent oil leakage from the gap between the plunger and the cylinder to ensure the volumetric efficiency of the pump.
l ·Vane pump: Wear-resistant sealing materials such as polytetrafluoroethylene are usually used between the blades and the blade grooves of the rotor to reduce leakage between the blades and the blade grooves and improve the output pressure and flow stability of the pump. A good seal is also required between the stator and the rotor. Generally, a rubber seal ring is used to prevent oil leakage from the gap between the stator and the rotor to ensure the normal operation of the pump.
Hydraulic cylinder
l Piston seal: The seal between the piston and the cylinder is crucial. Common seals include Y-shaped seals and V-shaped seals. The Y-shaped seal has good sealing and wear resistance, can adapt to different pressure and speed conditions, can prevent the oil in the hydraulic cylinder from leaking on both sides of the piston, and ensure the thrust and pull of the hydraulic cylinder. The V-shaped seal is composed of multiple layers of sealing rings, which can automatically adjust the sealing performance according to the pressure, and is suitable for high-pressure and large-stroke hydraulic cylinders.
l · Piston rod seal: Installed on the cylinder head of the hydraulic cylinder, commonly used combined seals include step seals and dust rings. The step seal consists of an O-ring and a polytetrafluoroethylene slide ring, which has the characteristics of low friction and high wear resistance, and can effectively prevent the oil from leaking from the piston rod and the cylinder head to the outside of the cylinder. The dust ring is installed on the outermost side to prevent dust and impurities from entering the hydraulic cylinder, protect the piston rod and seals, and extend the service life of the hydraulic cylinder.
Hydraulic valve
l Directional control valve: Between the valve core and the valve sleeve of the reversing valve, a gap seal or a sealing ring seal is generally used. The gap seal relies on the small gap between the valve core and the valve sleeve to achieve sealing. It has a simple structure, but the sealing performance is relatively poor. It is suitable for low-pressure and small-flow systems. The sealing ring seal uses O-rings, X-rings, etc., which are installed in the sealing groove of the valve core, which can effectively prevent the oil from leaking between the valve core and the valve sleeve, and improve the sealing performance and reliability of the reversing valve.
l ·Pressure control valve: Between the valve core and the valve seat of pressure control valves such as overflow valves and pressure reducing valves, a conical seal or a flat seal is usually used. The conical seal can produce a higher sealing specific pressure on a smaller contact area, and has good sealing performance. It is suitable for high-pressure and large-flow systems. The flat seal has better stability and reliability. Through appropriate preload and sealing materials, the sealing between the valve core and the valve seat is ensured, oil leakage is prevented, and the system pressure is stabilized.
l ·Flow control valve: Between the valve core and the valve sleeve of flow control valves such as throttle valves and speed regulating valves, a sealing ring seal or a gap seal is generally used. In order to ensure the accuracy of flow control, seals need to have good wear resistance and stability to prevent oil leakage due to wear or deformation, which would affect the accuracy of flow control.
Hydraulic valve
Oil tank: The sealing of the oil tank is mainly to prevent oil leakage and external dust, moisture and other impurities from entering the oil tank. Rubber gaskets are usually used between the oil tank cap and the oil tank to ensure the sealing of the oil tank. The oil drain port, liquid level gauge interface and other parts of the oil tank also need to use seals, such as O-rings, sealing plugs, etc. to prevent oil leakage.
Oil pipes and pipe joints: The seal between the oil pipe and the pipe joint is an important link to ensure that the hydraulic system is leak-free. Common sealing methods include conical seals, flat seals and O-ring seals. Conical seals rely on the conical surface of the oil pipe and the pipe joint to fit the conical surface tightly by tightening the nut to achieve sealing. It is suitable for high-pressure and large-diameter oil pipes. Flat seals are to install sealing gaskets, such as metal gaskets, rubber gaskets, etc., between the planes of the oil pipe and the pipe joint. The gaskets are deformed by tightening the nuts to fill the gap and achieve sealing. O-ring sealing is to install an O-ring in the sealing groove of the pipe joint, relying on the elastic deformation of the O-ring to achieve sealing. It has the characteristics of easy installation and good sealing performance, and is widely used in various hydraulic systems.
D Eleven supply standard and customized seals for Hydraulic industry. Include as below:
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