Three types of backpressure valves are diaphragm, spring and weighted lever.

有三种类型的回压阀，即隔膜式、弹簧式和负荷杆式。

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Three types of backpressure valves are diaphragm, spring and weighted lever.

有三种类型的回压阀，即隔膜式、弹簧式和负荷杆式。

youdao