A pressure relief valve (often a temperature and pressure, or T&P, relief valve) is a safety device on water heaters and other pressurized systems that opens when pressure exceeds safe limits. It releases excess pressure to prevent tank rupture or explosion and can also protect against unsafe temperatures.
/ˈprɛʃər rɪˈliːf ˈvælv/
A pressure relief valve (often a temperature and pressure, or T&P, relief valve) is a safety device on water heaters and other pressurized systems that opens when pressure exceeds safe limits. It releases excess pressure to prevent tank rupture or explosion and can also protect against unsafe temperatures.
What does a pressure relief valve do?
It releases excess pressure to prevent tank damage, rupture, or explosion.
Source: The Cooling Company
Relief valves open to release excess pressure safely.
A homeowner schedules annual water heater inspections, including a relief valve test, to ensure safe operation and prevent pressure-related damage.
Test the relief valve annually by lifting the lever. If it doesn’t release water or keeps dripping, replace it.
“Test the relief valve annually by lifting the lever. If it doesn’t release water or keeps dripping, replace it.”
Relief valves have dramatically reduced water heater explosion risks since their adoption.
Why is my pressure relief valve leaking?
It could be faulty, or system pressure/temperature may be too high. Have it inspected.
Can I cap the PRV discharge pipe?
No. The discharge pipe must remain open to release pressure safely.
How long do PRVs last?
Many last 3–5 years, but they should be tested annually and replaced if faulty.
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