Seals can be polymer materials, asbestos or rubber seal material selection depends on the valve components of the transmission medium, operating temperature, working pressure and flow rate.
密封件可以是高分子材料、石棉或橡胶，密封件材料的选择取决于阀门所输送的介质成分、工作温度、工作压力和流速。
According to the medium, temperature and pressure, the switching mechanism may be equipped with various types of safety valves so as to adapt the various working conditions.
切换机构上可根据使用介质、温度、压力的不同，配以不同型号的安全阀，以适应不同的工况条件。
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