Pressure Reducing Valves PRV | UL 1468 FM Listed High-Rise Standpipe | Valve-Atlas

Pressure Reducing Valves (PRV) for Fire Protection: UL and FM Listed Standpipe Zone PRV Supply

ValveAtlas supplies UL Listed and FM Approved pressure reducing valves (PRV), pressure regulating valves (PRV) and pressure control valves for high-rise standpipe zone pressure control, sprinkler system pressure regulation, fire pump discharge pressure management and hydrant hose valve pressure limitation on projects in Toronto, Montreal, New York, Boston and London.

This page is the technical reference for specifying engineers, EPC firms and mechanical subcontractors selecting PRVs on fire protection systems governed by NFPA 14 Section 7.2 (standpipe pressure control), NFPA 13 Section 8.1.2 (sprinkler pressure), BS 9990 and Approved Document B.

PRV range at ValveAtlas

Type	Function	End connection	Listings	Typical inlet pressure	Sizes
Hose valve PRV (field-adjustable)	Standpipe hose station pressure limit	2½” NST male outlet, grooved or flanged inlet	UL, FM	Up to 400 psi inlet	2½” hose outlet
Automatic PRV (direct-acting spring)	Continuous downstream pressure regulation	Flanged ANSI 150 or 300	UL, FM	Up to 400 psi inlet	2″ to 10″
Pilot-operated PRV	Precise downstream control, tight deadband	Flanged	UL, FM	Up to 400 psi inlet	4″ to 12″
Pressure relief valve (PRV)	Fire pump discharge thermal relief	Flanged or threaded	UL, FM	Pump discharge rating	¾” to 3″

Why high-rise buildings need PRVs

In a high-rise building, the fire pump discharge pressure sizes with the highest-elevation standpipe outlet. A 40-story building (400 feet elevation head) requires approximately 270 psi static pressure at the pump discharge to deliver 100 psi residual pressure at the highest outlet. But this high pressure at the lowest floors would be dangerous on hose lines (over 175 psi at 2½ inch hose is unsafe for firefighter operations per NFPA 14 Section 7.2).

NFPA 14 Section 7.2 requires the residual pressure at any standpipe hose outlet to be limited to 175 psi for 2½ inch hose or 100 psi for 1½ inch hose. This is achieved with:

• Zone 1 / Zone 2 / Zone 3 zoning: Separate fire pumps and standpipe risers serve groups of floors; each zone discharge pressure is sized to the highest outlet in that zone.
• Hose valve PRVs at each hose station: Field-adjustable PRVs limit the outlet pressure to 100 or 175 psi regardless of inlet pressure variation.
• Automatic PRVs at zone tie-ins: Where a single fire pump serves multiple floors of different elevation, automatic PRVs at each floor or group of floors regulate downstream pressure.

Listings and code acceptance

UL 1468. UL 1468 covers pressure reducing valves for fire protection service. Listed for up to 400 psi inlet, with downstream pressure adjustment from 100 to 175 psi on hose valve PRVs.

FM Approvals Class 1361. FM-insured property PRVs. FM Global, RSA, Aviva, Zurich, Allianz, AXA Commercial, Chubb, AIG, Travelers and Intact surveyors accept FM certificate.

NFPA 14 Section 7.2 compliance. All PRVs supplied meet NFPA 14 Section 7.2 pressure limitation requirements. Submittal package includes flow curves demonstrating pressure control across the expected standpipe flow range (250 to 500 gpm per hose outlet).

LPCB and BS EN 12845 UK acceptance. BS EN 12845 Section 15 recognition via LPS 1039 equivalent scope; UK high-rise standpipe installations per BS 9990 Section 5 (pressure control).

Hose valve PRV configuration

2½ inch hose valve PRV. Angle hose valve with integral PRV cartridge. Field-adjustable on installation; the adjustment screw sets the downstream pressure from 100 to 175 psi per NFPA 14. Pressure gauge port for pressure verification under flow. Chrome or brass finish; cap and chain included.

1½ inch hose valve PRV. For occupant-use fire hose connections (Class II and Class III standpipe). Downstream pressure limited to 100 psi for safe occupant operation.

Pressure gauge port. All hose valve PRVs include a pressure gauge port upstream and downstream for flow test verification per NFPA 25 Section 6.3.

Field adjustment. NFPA 14 Section 7.2.3 requires PRV adjustment to be verified under flow (not static pressure). Standpipe flow test with calibrated pitot gauge or friction-loss test with downstream hose verifies the PRV holds setpoint under flowing conditions.

Automatic PRV configuration

Direct-acting spring PRV. Simple spring-and-diaphragm design suitable for stable downstream applications. Economical and reliable but wider deadband (downstream pressure varies with flow rate).

Pilot-operated PRV. More precise downstream control with tighter deadband. Uses a pilot valve to sense downstream pressure and throttle the main valve accordingly. Recommended for high-rise Zone 2 and Zone 3 where downstream pressure stability is critical.

Set range. Automatic PRVs are field-adjustable from 75 to 250 psi downstream in typical configurations. Submittal must specify the target downstream setpoint.

Substitution matrix from Cla-Val, OCV, Watts, Bermad

Cla-Val 90-01 pilot-operated PRV. Substitute UL/FM listed pilot-operated PRV. Same downstream control precision.

OCV Model 127 hose valve PRV. Substitute UL/FM listed 2½ inch hose valve PRV.

Watts LF909 PRV. Substitute UL/FM listed direct-acting PRV.

Bermad 720 pilot-operated PRV. Substitute UL/FM listed pilot-operated PRV.

Zurn Wilkins ZW209 PRV. Substitute UL/FM listed PRV.

Where PRVs are installed

Standpipe hose station. Hose valve PRV at every 2½ inch hose outlet where inlet pressure could exceed 175 psi (typically all Zone 2 and Zone 3 hose outlets in a high-rise building).

Sprinkler zone control. Automatic PRV at sprinkler zone control valve where inlet pressure exceeds the sprinkler head pressure rating (typically 175 psi for standard sprinklers, 300 psi for high-pressure-rated heads).

Fire pump discharge. Pressure relief valve (small PRV) on fire pump discharge for thermal relief per NFPA 20 Section 4.15; relief opens when pump churns against closed discharge to protect the pump from overpressure.

Underground water main. Main PRV station at building service entry where public main static pressure exceeds building system rating (typical on elevated-water-tower utilities with 200+ psi static).

Regional stock and delivery for PRVs

Toronto. Hose valve PRVs 1½” and 2½” in stock at Toronto HQ for GTA high-rise standpipe construction. Automatic PRVs 2″ to 6″ stocked for Ontario high-rise projects.

Montreal. Next-day truck freight from Toronto. RBQ submittals with CNB-equivalent pressure regulation documentation.

New York. 2-day truck freight from Toronto. FDNY and NYC BC Chapter 9 Section 905 standpipe pressure control. PRVs pre-staged for Manhattan high-rise construction.

Boston. 2-day truck freight from Toronto. BFD and 780 CMR high-rise standpipe compliance.

London UK. UK partner warehouse stocks LPCB-listed PRVs. 5 to 7 day air freight via Heathrow.

Related products for complete standpipe trim

Gate valves. UV0199 OS&Y gate upstream and downstream of automatic PRV for isolation and service. See Gate Valves.

Check valves. Listed swing check downstream of PRV to prevent backflow from downstream zone into upstream pressure regulation. See Check Valves.

Pressure gauges. Listed 0 to 300 psi pressure gauges upstream and downstream of every PRV per NFPA 25 Section 6.3.

Butterfly valves. UVB-G310 grooved butterfly at zone tie-ins. See Butterfly Valves.

Frequently asked questions

Why limit standpipe hose outlet pressure to 175 psi? NFPA 14 Section 7.2 limits 2½ inch hose outlet pressure to 175 psi because above this pressure, nozzle reaction force on a 2½ inch hose exceeds the capability of a 2-firefighter crew. Above 175 psi, firefighters lose control of the hose stream; injury and property damage result. For 1½ inch occupant-use hose, the limit is 100 psi.

How often are PRVs tested? NFPA 25 Section 13.5 requires partial-flow PRV test every 5 years and full-flow test every 5 years (alternating with full-flow fire pump test). Annual inspection verifies gauge readings, adjustment lock intact, and no external leakage.

What is the difference between PRV and pressure relief valve? A pressure reducing valve (PRV) continuously regulates downstream pressure below inlet pressure (throttles to hold setpoint). A pressure relief valve opens only when upstream pressure exceeds a setpoint (to relieve overpressure), discharging to atmosphere or a relief main. Both are UL/FM listed but serve different functions; NFPA 20 requires both on a fire pump: relief valve for thermal relief and discharge PRV for pressure regulation on high-rise zones.

Can a single PRV serve multiple floors? Yes, on small Zone 1 standpipe applications. But high-rise Zone 2 and Zone 3 typically use hose-valve PRVs at every hose station because the elevation difference between floors produces pressure variation that a single floor-level PRV cannot regulate at the outlet.

Do sprinklers need PRVs? NFPA 13 Section 8.1.2 limits sprinkler head working pressure to the manufacturer-listed rating (175 psi for standard sprinklers, 250 or 300 psi for high-pressure-rated heads). Where supply pressure exceeds this limit, an automatic PRV is installed at the zone control assembly.

Contact ValveAtlas for a PRV quotation

For PRV quotations, high-rise standpipe zone pressure submittal packages or hose-valve PRV substitution for FDNY, Toronto Fire Services, SIM Montreal, BFD or London Fire Brigade projects, email the project specification and drawings to burakpadr@gmail.com or use the contact form. Standard turnaround is 48 hours.