一、 structure and purpose

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’sload 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 cur 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、 Schematic diagram of installation

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