valve clack

• 阀瓣

valve clack的用法和样例：

例句

1. 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。
2. 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。