Characteristics of Water Pressure Reducing Valves
December 05, 2025
Core Operating Principle
Operates on the principle of force equilibrium. By sensing outlet pressure and utilising the inherent energy of the medium (water), it automatically adjusts the valve disc opening.
Initial/Pressure Reduction: The set spring (or pilot valve) generates a downward force, opening the main valve disc to allow water flow, thereby increasing outlet pressure.
At pressure equilibrium: Outlet pressure is transmitted through sensing conduits (e.g., beneath the diaphragm), generating an upward force that balances the downward force of the spring. The valve disc stabilises at a specific opening, maintaining outlet pressure at the set value.
Pressure increase: Should the outlet pressure attempt to rise due to factors such as reduced water consumption, the detected upward force exceeds the spring force. This pushes the valve disc towards closure, reducing the flow area and thereby restoring the outlet pressure to the set value.
