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The pressure reducing valves are designed for maintaining the pressure downstream of the valve to an adjusted set point value.
The pressure reducing valve is a self acting unit consisting of:
- Valve
- Two or three springs
- Diaphragm in the actuator
- One capillary tube on upper side of the actuator
- Compensation chamber (forsteam applications)
The medium flows through the free area between the seat and cone in the direction indicated by the arrow on the body. The position of the valve cone determines the flow rate and consequently the pressure ratio across the valve.
The downstream pressure is transmitted through the compensation chamber and the capillary to the diaphragm, where it is converted into a positioning force. This positioning force is adjusting the cone with dependence on the force of the operating springs. The spring force can be adjusted by using the set point adjuster. The valve cone is pressure balanced.
The fluid pressure acts onto the bottom and top surfaces of the cone at the same time. In this way, the forces produced by the fluid pressure on the cone, are compensated.
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