导向阀 meaning in English

director valve
guide valve
pilot valve

Air pilot valve
空气导向阀
The parallel seat gate assembly consists of two interchangeable spring loaded discs , a fully guided disc carrier , and retaining pins
平行阀座闸阀由两个可互换弹簧负载阀瓣，一个全导向阀瓣托架和扣环销钉构成。
This valve being mounted in the water distribution pipes with its pilot valve being pre - setted in a fixde flow - rate which enable the pressure variation of the main body ' s upper - reach not to have an effect on the flow volume of the outlet
本阀安装于送配水管路中，可预先设定其上之导向阀于某一固定流量，使其主阀进口压力变化而不会影响出水口。