Control supply line water pressure. install a soft seated springloaded 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 loadedspring to return to the valve to its original position.