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Gemstone,
I had the same problem and it's easily remedied.
Turn off the main water supply and go inside and turn on the hot water faucet and let it drain until it stops. This puts a small amount of air in the tank.
The water heater needs an air pocket to allow for expansion of the hot water. If the air pocket is not there there is only one place for the water to go as it expands and that is out of the relief valve.
If you have already did this you may have purchased a defective replacement.????
Over the years I have sold hundreds and hundreds of relief valves, big and small, and a few have been defective but I think your main problem is the air pocket.
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