4.8 / 5
Customer
Satisfaction
Pressure relief valves are designed to protect fire protection systems, providing a release mechanism for excess pressure. These fast-acting, reliable safety relief valves automatically discharge water when system pressure exceeds a preset maximum—typically 150 or 175 PSI—helping prevent damage to sprinkler pipe, fittings, and other system components.
Used in wet pipe systems, these valves are installed downstream of the pressurized water source and often a fire pump to maintain safe water flow and system performance. Built with durable brass construction, each valve is engineered for long-term reliability and consistent discharge under demanding conditions.
These valves meet industry requirements for installation in commercial and residential fire sprinkler systems, in specific applications outlined by the manufacturer.
Pressure relief valves are designed to relieve excess pressure caused by thermal expansion, pump surges, or fluctuations in water supply. Without a properly sized and installed valve, excess pressure can exceed the system’s pressure rating—leading to leaks, damaged components, or system failure.
These safety valves feature:
Every valve is designed to protect a fire protection system by maintaining safe operating conditions. Whether installed on a riser or otherwise integrated into system design, these valves help prevent costly damage and ensure compliance with NFPA standards.
Their compact design allows for flexible installation while maintaining optimal performance in both residential and commercial applications. With dependable operation and featuring durable materials, these valves deliver long-term protection where it matters most.
At QRFS, we carry fire sprinkler pressure relief valves in multiple sizes and pressure ratings, all engineered for safety, compliance, and performance. Our team provides expert support to help you select the right model for your application—plus we offer same-day shipping on in-stock orders placed before 4 PM EST.
If you need additional fire protection parts, review our selection of:
Return to the QRFS home page to explore our complete inventory of fire protection equipment.
What is a pressure relief valve in a fire sprinkler system?
A pressure relief valve is a safety device designed to relieve excess pressure in a fire sprinkler system. It automatically opens at a preset pressure—often 150 or 175 PSI—to discharge water and protect the system. This helps prevent damage to sprinkler pipe, fittings, and other components.
Why are pressure relief valves required in sprinkler systems?
Pressure relief valves are required by NFPA 13 to protect systems from overpressure conditions. Excess pressure can occur due to thermal expansion, pump surges, or failure of a pressure-restricting/reducing valve (PRV). Installing a relief valve ensures the system stays within its safe pressure rating.
Where are pressure relief valves installed?
These valves are typically installed downstream of a pressure-reducing valve (PRV) or on the sprinkler riser. They may also be located near the system pump or other points where pressure spikes can occur. Proper placement is critical for effective pressure control and system performance.
What pressure settings are available for sprinkler relief valves?
Many fire sprinkler pressure relief valves come preset at 150 PSI or 175 PSI, depending on system requirements. Some models are also adjustable within a specific range. The correct setting depends on the system’s design and maximum allowable pressure.
How does a pressure relief valve work?
A pressure relief valve remains closed during normal operation. When system pressure exceeds the preset limit, the valve opens quickly to discharge water and relieve excess pressure. Once pressure returns to a safe level, the valve reseats automatically.
What materials are pressure relief valves made from?
Sprinkler pressure relief valves are constructed from durable brass, which resists corrosion and provides long-lasting performance. Brass bodies are ideal for handling continuous water flow and high-pressure conditions and are reliable and durable in both commercial and residential applications.
What causes excess pressure in a sprinkler system?
Excess pressure can result from thermal expansion, water supply fluctuations, or pump operation. It may also occur if a pressure-reducing valve fails or malfunctions. Without a relief valve, these conditions can damage system components.
Do pressure relief valves require maintenance?
Yes, pressure relief valves should be inspected regularly as part of routine system maintenance. Checking for leaks, corrosion, or improper discharge ensures the valve will operate correctly when needed. Maintenance helps extend the life of the valve and maintain system reliability.