As the name indicates the self closing valve is closed automatically when the lever or push button is released, meaning that there is no risk of the valve being left open by mistake if someone is interrupted during operation. The static pressure in the tank or the head in the system in cooperation with the spring closes all self closing valves. Our self closing valves are available with metal sealing or with soft sealing. The push button or lever has to be pressed for drainage and for several models a mechanical locking function can be activated.