Since the compensation valve cannot open unless it is mechanically actuated by the flat diaphragm via a lever, it ensures that the flat diaphragm and the hose diaphragm cannot be over-stretched.

• 除非通过杠杆受平隔膜的机械作用，补偿阀门是打不开的，这就保证了平隔膜和软管隔膜不会被过分地拉伸。