Proportional pressure reducing valve

Proportional pressure reducing valve is a valve that uses the pressure difference generated by the different cross-sectional areas of the piston at both ends inside the valve body to change the pressure behind the valve. It is a valve that can regulate and stabilize the pressure of the medium based on a fixed proportional relationship between the inlet pressure and the outlet pressure. It is widely used in high-rise building water supply, industrial equipment and other fields. The characteristic of this valve is that it can maintain a certain pressure reduction ratio under different pressure conditions, ensuring the normal operation of downstream equipment.

 

When there is no water on the pipe network behind the valves, the valve is closed and the pressure ratio before and after the valve is a constant value; When the fire hydrant or nozzle is used to spray water in the pipeline network behind the valve, the pressure in front of the valve is greater than the pressure behind the valve, which pushes the piston to move backwards and opens the valve. The pressure in the pipeline network behind the valve decreases with the increase of flow until it reaches the equilibrium position, and the piston stops moving. When the pipeline network stops using water after the valve, due to the increase in pressure at the rear end of the piston, the piston loses its balance and moves forward, and the valve closes. The common pressure reduction ratios of proportional reducing pressure valve include 2:1, 3:1, 4:1, 3:2, 5:2, etc., and special ratio pressure reducing valves can also be designed according to requirements.