Check valves or one-way valves allow only one flow direction and are formed of a disc bound by a guide.
When there is a negative or insufficient pressure the valve stays closed, otherwise it opens and the fluid is free to move past the sides of the disc and go beyond it.
The check valves are mounted on the output tubes of the circulation pumps to allow the flow in only one direction and thus prevent reflux. The valves are also needed to prevent the emptying of the system in case of stopping the pump.
All our valves are available both cast and forged.