Valve seat (ring) generally use the Teflon and other flexible materials, easy-to ensure the seal, and valve sealing force with medium pressure increases.
球阀阀座(密封圈)一般采用聚四氟乙烯等弹性材料制造，易于保证密封，而且球阀的密封力随着介质压力的增加而增大。
Teflon - lined pipe, casing, elbow, the three exchanges or four, size head, cylinder, air compressor - oxygen - ring, gasket seal ring and auto parts.
聚四氟乙烯内衬直管， 套管，弯头，三通，四通，大小头，筒体，空压机-制氧机- 活塞环、密封圈和汽配封圈。
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