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1·Control supply line water pressure. install a soft seated spring loaded check valve upstream of the assembly.

控制供应管道的水压。在总成的上游安装一个软阀座，弹簧负载止回阀。

2·Air valve size and airflow resistance losses of valves always speed and the size of the spring-loaded edge.

气阀阻力损失大小与气流的阀隙速度及弹簧力大小有关。

3·The spring return pneumatic actuators use an air supply to drive the valve stem in one direction and an internally loaded spring to return to the valve to its original position.

春季返回气动执行机构使用的空气供应，以推动一个方向阀杆和一个内部装载弹簧返回到原来的位置阀门。