bellows seal ball valve 波纹管球阀
bellows seal ball valves 波纹管球阀
Introduces a kind of sealing device for ball valves, by means of orbital groove, applied the principle of bellows sealing to the production of ball valves.
介绍了一种球阀密封装置，通过轨道槽的作用使波纹管密封的原理在球阀的生产中得以运用。
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