---
title: Water Pressure Reducing Valves (PRV) - Cougar USA | HVAC and Plumbing Solutions | Houston
description: Water Pressure Reducing Valves (PRV) - Cougar USA | HVAC and Plumbing Solutions | Houston
image: https://cougarusa.com/hubfs/Cougarusa_August2024/Images/Water%20Pressure%20Reducing%20Valves%20(PRV).webp
---
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# Water Pressure Reducing Valves (PRV)
Pressure Reducing Valve (PRV) Stations are an essential component of a water-distribution system in a commercial building. The [2015 Uniform Plumbing Code Section 608.2](https://epubs.iapmo.org/UPC/mobile/index.html#p=141) states that PRVs are required at any point where the system static pressure exceeds 80 PSI. Typically, this applies to mid- and high-rise buildings when the pressure boost to serve the upper floors is over 80 PSI. It takes a combination of valves and safety devices to create a Pressure Reducing Station.
**Components of a PRV Station**
**Pressure Reducing Valves** – stations are designed with a High-Flow and Low-Flow PRV that work in parallel to maintain a constant pressure downstream across the flow load profile of the zone. Low-Flow valves are typically direct-acting (ex. Cla-Val Model CRD-L), and High-Flow valves are pilot-operated (ex. Cla-Val Model 90-01); however actual valve selections depend on the flow and pressure drop of each station.
**Relief Valve** – Relief valves are required downstream of the PRVs to prevent over-pressurization when the PRV fails. A pilot-operated valve can be used (ex. Cla-Val Model 50-01), but we recommend a direct-acting valve like the Cla-Val Model 55B.
**Block Valve and Control Panel** – The addition of a pressure switch, control panel, and block valve can add additional safety and monitoring to the PRV Station. When a PRV fails, the pressure switch detects the high pressure and sends a signal to the control panel. This triggers the panel alarms (local and BAS output) and closes the block valve to shut down the water supply to the zone.
**Piping Components** – A Strainer is required upstream of the PRVs to keep them clear of trash. Pressure gauges are required on both the high-pressure and low-pressure sides of the PRVs to see what the pressure drop across the valve is. Isolation valves on all PRVs and relief valves are required for maintenance.
**Links**
[https://cougarusa.com/design-considerations-for-water-pressure-reducing-valve-prv-stations-in-commercial-buildings/](https://cougarusa.com/news/design-considerations-for-water-pressure-reducing-valve-prv-stations-in-commercial-buildings)
[https://cougarusa.com/avoiding-cavitation-in-water-pressure-reducing-valves/](https://cougarusa.com/news/avoiding-cavitation-in-water-pressure-reducing-valves)
##### TIPS
###### [Cla-Val Tips](https://youtube.com/playlist?list=PLcNqT9SBBCO4LIBe_oiAz28qmqj9tsHvg)
##### News Posts
[Powerful Heat: Cougar USA and Fulton Boilers Join Forces in a Dynamic Partnership](https://cougarusa.com/news/powerful-heat-cougar-usa-and-fulton-boilers-join-forces-in-a-dynamic-partnership)
[Pressure Boosting Systems – Pt3](https://cougarusa.com/news/pressure-boosting-systems-pt3)
[Pressure Boosting Systems – Pt2](https://cougarusa.com/news/pressure-boosting-systems-pt2)
[Pressure Boosting Systems – Pt1](https://cougarusa.com/news/pressure-boosting-systems-pt1)
[Water PRV Sequence of Operation](https://cougarusa.com/news/water-prv-sequence-of-operation)
##### DID YOU KNOW?
##### Pumping to full 300GPM is ineffcient; systems perform best around 50GPM via diversity factor
##### TECH TALK VIDEOS
##### [ TECH TALK VIDEO WATER PRV STATION DESIGN PART1-F FLOW WATCH VIDEO](https://player.vimeo.com/video/482800488?title=0&byline=0&portrait=0&api=1&player_id=4)
##### [ TECH TALK VIDEO WATER PRV STATION DESIGN PART 2 PRESSURE DROP WATCH VIDEO](https://player.vimeo.com/video/482800728?title=0&byline=0&portrait=0&api=1&player_id=1)
##### [ TECH TALK VIDEO WATER PRV STATION DESIGN PART 3 - SET PRESSURES WATCH VIDEO](https://player.vimeo.com/video/482801310?title=0&byline=0&portrait=0&api=1&player_id=3)
##### [ TECH TALK VIDEO WATER PRV STATION SEQUENCE OF OPERATION WATCH VIDEO](https://player.vimeo.com/video/482801310?title=0&byline=0&portrait=0&api=1&player_id=6)
##### [ TECH TALK VIDEO WATER PRV STATION COMPONENTS WATCH VIDEO](https://player.vimeo.com/video/482796938?title=0&byline=0&portrait=0&api=1&player_id=7)
##### [ TECH TALK VIDEO AVOIDING CAVITATION NI WATER PRV'S WATCH VIDEO](https://player.vimeo.com/video/482802068?title=0&byline=0&portrait=0&api=1&player_id=5)
##### [ TECH TALK VIDEO WATER PRV STATION DESIGN PART4 4 - VALVE SELECTIONS WATCH VIDEO](https://player.vimeo.com/video/482801632?title=0&byline=0&portrait=0&api=1&player_id=2)
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