745 The pump control valve is installed at the pump outlet to prevent and eliminate the damage of water hammer to the water pump and pipeline system when the pump is on / off or off.
When the water pump is opened, the pressure in front of the valve enters into the middle chamber, which makes the diaphragm moving component rise. The upper chamber of the valve cover is connected with the outlet of the main valve. The volume of the upper chamber is emptied and the valve disc is opened slowly.
When the water pump is shut down, water hammer will be generated behind the valve, and the pressure behind the valve will act on the large valve disc, making the large valve disc close quickly; at the same time, the outlet pressure will enter the upper chamber of the valve cover, so that the diaphragm component will slowly drop and the small valve disc will be closed slowly; the impact of water hammer on the valve and pipe fittings will be prevented.
The special large and small disc design makes the main valve close slowly.
At the same time, the opening and closing speed of the valve can also be adjusted by adjusting the opening of the throttle valve in the upper chamber and the middle chamber.

Structure configuration table
Double chamber main valve
throttle valve