[化] 阀瓣

valve clack的用法和样例：

例句

All valve seats and seat discs shall be replaceable.所有阀门阀座和阀座阀瓣应该是可更换的。
Grease Injector at Seat Ring and Disc of Globe Valve.截止阀的阀座环和阀瓣上的润滑油注入器。

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