Valve flap and valve seat for the soft seal, seal performance, no leakage.
阀瓣与阀座为软密封，密封性能好，无泄露。
The diametre of seat turns bigger when flap moves higher and smaller when flap lower.
根据阀瓣的这种形动形式，阀座通口的变化就是与阀瓣行程成正比例关系。
The diametre of seat turns bigger when flap moves higher and smaller when flap lower.
根据阀瓣的这种形动形式，阀座通口的变化就是与阀瓣行程成正比例关系。
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