Pressure-reducing valves (PRV) function by?

Pressure-reducing valves (PRV) function by?

• A. Regulates pressure under static conditions only
• B. Increases pressure during flow
• C. Decreases pressure during flow
• D. Regulates pressure under both flowing and static conditions

Answer: (D)

Pressure-reducing valves are meant to take a higher upstream pressure and hold downstream pressure at a set value, regardless of whether water is moving or stationary. They sense the downstream pressure and adjust the valve opening to keep that setpoint steady. When flow occurs, the valve throttles to maintain the target downstream pressure; when there is no flow, it still maintains that same downstream pressure rather than letting it spike or drop. This makes them effective for protecting piping and devices from excessive pressure while ensuring a usable, stable supply. So, the function is to regulate downstream pressure under both flowing and static conditions.

Pressure-reducing valves are meant to take a higher upstream pressure and hold downstream pressure at a set value, regardless of whether water is moving or stationary. They sense the downstream pressure and adjust the valve opening to keep that setpoint steady. When flow occurs, the valve throttles to maintain the target downstream pressure; when there is no flow, it still maintains that same downstream pressure rather than letting it spike or drop. This makes them effective for protecting piping and devices from excessive pressure while ensuring a usable, stable supply. So, the function is to regulate downstream pressure under both flowing and static conditions.