封件是气动增压缸的核心配件，密封材质的好坏直接影响气动增压缸设备的运行状况，一旦密封件的材质不好便可能引起气动增压缸漏油的现象，而好的密封材料可以延长气动增压缸工作时间，减少泄露，降低污染。
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.
气动增压缸产品采用的密封圈的密封性能和它的密封材料有着严格的要求，其耐油性、耐寒性、耐磨性、弹性和机械强度都应符合标准，同时还应具有一定的化学稳定性以防止老性能。产品均采用进口密封件：日本NOK进口气封及英国HALLIET进口油封。
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.
目前，气动增压缸密封件常用的材质是合成橡胶和合成树脂。合成橡胶品种繁多，广泛应用的是丁腈橡胶和聚氨酯橡胶。
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.
丁腈橡胶是一种耐油橡胶，具有较好的弹性和耐热性能，有一定的机械强度，摩擦力较大，通常的工作温度为：-20°C--80°C，易於用于属模压成任意形状的液压密封件，因此，丁腈橡胶*適宜於制作工作压力不大于32Mpa气液增压缸用液压密封件。
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.
聚氨酯橡胶的耐油性能比丁腈橡好，其有较高的弹性和强度，耐磨性能好，工作温度一般为-30°C--100°C，它常应用在耐磨性要求较高的地方，特別適宜於制作中压、高压及超高压气动增压缸用液压密封件。合成树脂主要有聚四氟乙烯。聚四氟乙烯是一种塑料密封材料，耐热性高，耐腐蚀性能好，工作温度较高，摩擦力极小，但弹性差，一般适用于高压密封.也有橡胶制成的O型密封圈，表面包一层很薄的聚四氟乙烯，这种密封圈既具有一定的弹性，又具有很小的摩擦系数，常用在对滑动阴力有一定限制的高速伺服油缸中。
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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