Seal is the core part of pneumatic booster cylinder. The quality of sealing material directly affects the operation condition of pneumatic booster cylinder. Once the sealing material is not good, it may cause oil leakage of pneumatic booster cylinder. Good sealing material can prolong the working time of pneumatic booster cylinder, reduce leakage and reduce pollution.
The sealing performance and sealing material of the sealing ring used in the pneumatic booster cylinder have strict requirements. Its oil resistance, cold resistance, wear resistance, elasticity and mechanical strength should meet the international standards. At the same time, it should have certain chemical stability to prevent old performance. Products are imported brand seals: Japan NOK gas seal and British halliet oil seal.
At present, the commonly used materials of pneumatic booster cylinder seals are synthetic rubber and synthetic resin. There are many kinds of synthetic rubber, among which nitrile rubber and polyurethane rubber are widely used.
Nitrile rubber is a kind of oil resistant rubber, which has good elasticity and heat resistance, certain mechanical strength and high friction force. The normal working temperature is: - 20 ° C -- 80 ° C. It is easy to be used for any shape of hydraulic seal. Therefore, nitrile rubber * is suitable for making hydraulic seals for gas-liquid booster cylinders with working pressure not more than 32 MPa.
The oil resistance of polyurethane rubber is better than that of nitrile rubber. It has higher elasticity and strength, better wear resistance, and its working temperature is generally - 30 ° C -- 100 ° C. It is often used in places with high wear resistance, especially suitable for making hydraulic seals for medium pressure, high pressure and ultra-high pressure pneumatic booster cylinders. The main synthetic resin is polytetrafluoroethylene. Polytetrafluoroethylene (PTFE) is a kind of plastic sealing material with high heat resistance, good corrosion resistance, high working temperature, low friction, but poor elasticity. It is generally suitable for high pressure sealing. There are also O-ring made of rubber, which is covered with a very thin layer of polytetrafluoroethylene. This kind of sealing ring not only has a certain elasticity, but also has a very small friction coefficient, which is commonly used for sliding negative force High speed servo cylinder with fixed limit.
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