How to Select the Correct PSI for your Fire Sprinkler Pressure Relief Valve

FAQ – Which PSI???

Pressure relief valves are critical components in fire sprinkler systems,

Model 7000L Lockable Pressure Relief Valve

safeguarding the system by relieving excess pressure caused by supply surges or temperature fluctuations. Since the 2010 edition of NFPA 13, these valves have

been mandatory for all wet pipe systems. Selecting the correct pressure relief valve for a specific system requires careful planning to ensure compliance and optimal performance.

 

Understanding NFPA 13 Requirements

NFPA 13 outlines the necessity of pressure relief valves to maintain system integrity:

  • Relief Valve Specifications: Wet pipe systems must include a listed relief valve of at least 1/2 inch in size. The valve should operate at either 175 psi or 10 psi above the maximum system pressure, whichever is greater.
  • Listing Requirements: A “listed” valve must meet standards set by third-party organizations like UL or FM, ensuring the valve’s reliability and suitability for fire sprinkler systems.
  • Exception Clause: Relief valves are not required if auxiliary air reservoirs are installed to absorb pressure increases.

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