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How to test Expansion Tank Function
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- Locate the rating information on the valve to identify the pressure setting and discharge capacity.
- Shut off and drain the isolation valves to remove pressure from the valve inlet.
- Lift and release the test lever at the valve inlet to flush any debris and ensure free movement.
- Attach a pressure gauge to the valve inlet port or piping to monitor test pressure.
- Use a pump to slowly pressurize the valve inlet, watching the gauge for the relief point.
- Continue pressurizing until the valve fully discharges at its listed capacity.
- Release pressure and allow the valve to reset. Repeat pressurization to test reseating.
- Compare test results to valve ratings for proper lift and discharge. Adjust if out of specification.
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