As the pressure on diaphragm (8) approaches a balance with the force exerted by adjusting spring (5), disc (20) is throttled to a position where just enough water flows to maintain the set delivery pressure.

• 当隔膜(8)上的压力接近等于调节弹簧(5)的弹簧力时，阀瓣(20)就进行节流状态，使得刚好有足够的水流来保持设置的输出压力。