密封材料为橡胶、聚四氟乙烯等。由于结构独特的限制，不适用耐高温、高压及耐腐蚀、抗磨损等工况。

The sealing materials are rubber, polytetrafluoroethylene, etc. Due to unique structural limitations, it is not suitable for working conditions such as high temperature and high pressure resistance, corrosion resistance, and wear resistance.