Pressure Valve Leaking After Replacing Expansion Tank - Plumbing - DIY Home Improvement | DIYChatroom

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Old 12-14-2011, 07:59 PM   #1
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Pressure valve leaking after replacing expansion tank

Water heater is about 11 years old. 40 Gal, the expansion tank sprung a leak and I replaced it, had to relieve some pressure from the water heater using the valve. Now there seems to be a repeating discharge from the pipe coming from the pressure relieving valve.

Is that valve bad? I know that some sediments can get lodged so i tried opening the valve for 10 sec to "flush" it, no luck.

Should I replace the valve? Or is this normal? It's never "leaked" before.

Thanks in advnace!


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Old 12-14-2011, 08:12 PM   #2
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did you set the tank pressure to match incoming line pressure...and did you check to see if line pressure is greater than 80psi..if it is higher need pressure reducing valve....requirements for tank install...


Last edited by ben's plumbing; 12-15-2011 at 02:11 PM.
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Old 12-15-2011, 07:55 AM   #3
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Empty out the expansion tank before setting the pressure. To do this, turn off the main water valve, then open a hot and a cold faucet upstairs. If needed, pressurize the expansion tank trying to keep it at five PSI until the two faucets stop flowing.

Now follow the instructions for pressurizing the expansion tank. If no instructions then just turn off the faucets and turn on the main water valve.
The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.

Last edited by AllanJ; 12-16-2011 at 06:42 AM.
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