pressure relief valve Italy

...Automatic air vent valve, body in CW617N brass and cover in Hostafoam, with moving and floating parts in synthetic material, PP. Sand blasted finishing. Can be combined with automatic check valve 801 - 802 - 803.

...This valve protects pumps and pipes from pump startup and shutoff pressure surges due to power failure. Pump off means valve normally closed. If pump starting cause pressure surge, the pilot smoothly opens the valve to limit pressure rising. Quick relief valve opens due to both pressure rises and falls, fully reducing any pressure fluctuation.