前端阀 FV-S ; FV-L ; FDV-L ; FDV
阀前后压力差 p
分电盘真空提前控制阀 distributor vacuum advance control valve
分电盘真空提前电磁阀 distributor vacuum advance solenoid
分电盘点火提前电磁阀 distributor advance solenoid
前动臂阀 foreboom valve
滑阀超前 [机] slide valve lead ; valve lead
前中继阀 front relay valve
配电盘真空提前阀 distributor vacuum advance valve
这里是一个近距离的一个单向阀前粘合。
根据流向不同，平衡阀芯所受的压力可以是阀前压力，也可以是阀后压力。
According to flow in a different, balanced spool valve the pressure can be pre-pressure, can also be a back pressure valve.
应该如图所示在防回流阀前安装一个过滤器，防止阀瓣出现不必要的污垢。
A strainer should be installed as shown, ahead of backflow preventers to prevent discs from unnecessary fouling.
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