Which device reduces the discharge pressure at standpipe connections to a fixed level, often 100 psi?

Which device reduces the discharge pressure at standpipe connections to a fixed level, often 100 psi?

• A. Pressure Reducing Valve
• B. PIV
• C. OS&Y
• D. Flow Hydrant

Answer: (A)

A pressure reducing valve automatically lowers the water pressure to a set level downstream, commonly around 100 psi, on standpipe circuits. This keeps outlet pressures predictable and safe for hose lines and fittings, protects equipment from over-pressurization, and compensates for varying upstream supply so that the discharge remains steady even as supply pressure changes. The other items aren’t pressure-regulating devices. A post indicator valve shows whether the main valve is open or closed and is used for isolation and identification, not pressure control. Outside screw and yoke describes a type of gate valve used for isolation, not regulation. A flow hydrant is a hydrant designed for large-volume discharge, not for maintaining a fixed downstream pressure.

A pressure reducing valve automatically lowers the water pressure to a set level downstream, commonly around 100 psi, on standpipe circuits. This keeps outlet pressures predictable and safe for hose lines and fittings, protects equipment from over-pressurization, and compensates for varying upstream supply so that the discharge remains steady even as supply pressure changes.

The other items aren’t pressure-regulating devices. A post indicator valve shows whether the main valve is open or closed and is used for isolation and identification, not pressure control. Outside screw and yoke describes a type of gate valve used for isolation, not regulation. A flow hydrant is a hydrant designed for large-volume discharge, not for maintaining a fixed downstream pressure.