一、Structure and purpose

Use in a pipeline system to prevent it from surpassing pressure or keep the pressure of it．to reduce the water hammer’s shock after the pump is closed and also and also used as a water hammer remover for a large water supply system．On the inlet of the valve’s control system a self cleaning filter screen is placed，which，by means of the bigger specific gravity of the fluid，stops the suspension grains of a bigger specific gravity and diameter going into the sys-tern to ensure the main valve’s water supply pressure at the upstream at a set value to get the system smoothly circulated without any resistance．This valve features sensitive open-close，safety，reliability，stable motion and long duration

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.Recommended to select the butterfly valve in case of≥DN350