一、结构及用途 structure and purpose

      该阀用于水泵出口控制水泵的实际工作扬程 ,以限制水泵的工作流量,限制水泵电机负载,使水泵在较高效率状态下工作,防止水泵电机在低扬程、大流量、低效率时发生过载现象，防止超额定电流烧坏水泵电机现象发生，同时起到一定节能效果。安装、维护、调试、检查方便，使用寿命长，同时具有缓闭清声止回阀功能。

This valve is used at a water pump's outlet to control the real working head of the pump so as to limit the working flow and the motor's load of it，make the pump working in a higher efficiency, prevent the motor from being overloaded in case if a low head，a big flow or a low efficiency and from being burnt due to an extra-rated cu r rent，with a certain energy saving effect Easy installation，maintenance，adjustment and check，long duration and of the function to be a slowly closed silencing check valve.

四、主要外形及连接尺寸 Schematic diagram of installation

注：安装示意图中弹性座封闸阀或蝶阀任选，建议≥ DN350选蝶阀。

Note:Either elastic seat ring sealed gate valve or butterfly valve can be selected in the schematic diagram of installation Recomended to select the butterfly valve in case of ≥ DN350