Pressure Relief Valve
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.
💡 Key Takeaways
- ✓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.
- ✓Never block or remove a relief valve; it is essential for safety.
- ✓Frequent discharge can indicate pressure control or expansion issues.
- ✓Relief valves require periodic inspection and replacement if faulty.
Pressure Relief Valve
/ˈprɛʃər rɪˈliːf ˈvælv/
Definition
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
Quick Facts
How Pressure Relief Valve Works
Relief valves open to release excess pressure safely.
Real-World Application
A homeowner schedules annual water heater inspections, including a relief valve test, to ensure safe operation and prevent pressure-related damage.
Pro Tip
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.”
Important Things to Keep in Mind
- Never block or remove a relief valve; it is essential for safety.
- Frequent discharge can indicate pressure control or expansion issues.
- Relief valves require periodic inspection and replacement if faulty.
Did You Know?
Relief valves have dramatically reduced water heater explosion risks since their adoption.
FAQ
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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