Share This Story, Choose Your Platform!
Download the instructions
Print Friendly, PDF & Email
Welcome to our ‘How-To’ video series!

Expansion Tank Pressure relief valve tripping

    1. Check the expansion tank pressure and compare to system pressure. Refill tank air to match if needed.
    2. Inspect tank bladder or diaphragm for damage. Replace tank if bladder is defective and allowing water through.
    3. Make sure the tank is sized adequately for the system volume and temperature. Upgrade if undersized.
    4. Check for incorrectly closed valves preventing water from returning to tank when heated. Open all returns.
    5. Monitor system pressure for signs of over-pressurization from faulty fill valves or pumps. Repair cause.
    6. Inspect relief valve for mineral deposits or defects not allowing it to re-seat properly. Fully open and flush valve.
    7. Make sure there is no isolation valve restricting flow to relief valve inlet. Remove any valves found.
    8. Test valve discharge capacity and lift pressure. Replace if not operating to stated specs.
Explore How-To Videos