Each string is attached to a lever, which is in turn attached to a spring.

每根琴弦附在每一杠杆上，各杠杆依次连接每一根弹簧。

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Note: On pump discharge, the preferred check valves are an in-line spring loaded, swing design with lever and weight or lever and spring.

注意：在泵排泄口，首选的止回阀是管内弹簧负载，带杠杆和压铁或杠杆和弹簧的旋启式止回阀。

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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。

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