Valve number 2 is awkward to maintain, as its spring return actuator is heavy and causes unnecessary strain on the pipe elbow just above it before the pipe turns downward through the floor.

 
  • 2号阀门也很难进行维护,因为它的弹簧复位执行器非常重,而且正好位于管道转向地面的弯管上,因此管道承受着很大的压力。
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