原文：
1、水泵启动前，阀门处静压关闭状态。水泵启动后，水从阀门进口端的旁路管道进入膜片室下腔，将膜片连同阀杆和小阀板缓缓抬起。与此同时，大阀板在进水压力作用下也随即开启。 2、随着进水流量和压力的增大，膜片连同阀杆和大、小阀板上升到额定高度（可直观信号杆）。今日焦点： 3、当水泵停止时，阀门进口水流量聚停，压力降低，大阀板在自重和回水压力作用下快速下滑，直至xx接触阀座。 4、随着回水压力增大，水从出口端的旁路管道进入膜片室上腔，推动膜片连同阀杆和小阀杆和小阀板缓缓下移。此时，膜片室下腔的水通过阀门左边的旁路管道流回进口端。当小阀板xx关闭了大阀板与阀杆之间的环形泄流口时，阀门又xx恢复到水泵启动前的静压关闭状态。

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译文：
1, water pump before the start of static pressure off the valve. Pump starts, water from the bypass valve inlet pipe into the cavity under the diaphragm chamber, the diaphragm with the valve stem and small plates slowly lifted. At the same time, a large valve plate in the water under pressure also opens. 2, with the water flow and pressure, the diaphragm together with the stem and the large and small valve plate to rise to the rated height (can directly signal bar). Today the focus: 3, when the pump stops, the valve stop imports of polyethylene water flow, pressure drop, large backwater valve plate in the weight and rapidly declining under pressure until the full access to the valve seat. 4, with the return water pressure, water from the outlet of the bypass pipe into diaphragm chamber on thechamber to promote the diaphragm together with the stem and the small valve stem and small plates slowly move down. At this point, under the diaphragm chamber through the valve on the left chamber of the water flow back to the inlet of the bypass pipe. When the small valve plate completely closed the major valve plate and valve ring between the discharge port, the valve has fully recovered before the start of the static pressure to the pump off.