The regulatory valve for controlling the pressure in front of the valve, the valve effect is pressed. The working principle is as follows:

The medium flows into the valve body from the direction of the arrow, and is output after flowing through the valve seat and valve core. Another way to take the pressure pipe (the medium is a steam) is introduced into the enforcement agency to act on the membrane, so that the valve core will be displaced accordingly to achieve the purpose of leakage and stabilization. If the pressure on the front of the valve increases, the force on the membrane is increased, the reducing spring, driving the valve core, and increasing the opening of the valve until the pressure in front of the valve drops to the set value. In the same way, if the pressure after the valve decreases, the force acts on the film decreases. Due to the reaction force of the spring, the valve core is driven, which is a reduction of the opening of the valve until the pressure in front of the valve rises to the set value. If the pressure in front of the valve is less than the set value, the valve is always closed.