Lazy Daze Owners' Group

Water pressure relief valve drip

August 04, 2021, 09:59:33 pm

Water keeps dripping from the pressure relief valve, despite multiple attempts to reestablish the air pocket per the LD manual. Any other thoughts of what to try before just buying a replacement valve?

The pump continually cycling when it’s on due to the drip from the valve is driving us a bit distracted. Of course, turning off the pump doesn’t stop the drip.

Thanks in advance!

Re: Water pressure relief valve drip

Reply #2 – August 05, 2021, 12:02:35 am

Thanks Larry! Yes repeatedly snapped it back into double digits over the last couple of days. We’ll just deal with the slow drip until we’re back home.

Re: Water pressure relief valve drip

Reply #4 – August 05, 2021, 11:53:59 am

Hi Ray;  The valves build up white mineral deposits when they start to leak. Magnesium and calcium in the water that makes it hard, precipitates out when the water is heated. If you routinely flush your water heater for maintenance, that's where the white flakes come from.  Once the valves don't seal all the way, the air in your 'bubble' leaks out first, followed by water which generates more particles on the seal.  If the water is normal hot, it isn't a thermostat problem.  
    With the water pump off, relieve the pressure and unscrew the valve. Prop the valve seat open and clean it in a hard water stain removal liquid like CLR. Generally that will clean the deposits off the valve seat that is keeping it from sealing. Reinstall using some teflon pipe tape.
   (cribbed from somewhere on the internet:)   Step 4 – Soak
Now it is time to allow the TPR valve to soak. Mix 4 cups of hot water with a 1/2 cup of CLR cleaner. The TPR valve will need to soak for about 2 minutes. Once it has soaked, it will need to be scrubbed with a scrub brush to remove all of the mineral deposits.
Step 5 – Teflon Tape
Wrap up the threads at least 2 times around with some Teflon tape. Once you have done this, you will need to get your TPR valve inserted into the tank fitting. Make sure that it is attached tightly. Wrap up the drain pipe threads with Teflon tape and then attach the TPR valve. This will help to prevent future leaks. (Most comments on the internet refer to residential water heaters, 40 or 50 gallons. Of course have it turned off, turn off the pump, open a hot water faucet to relieve pressure, etc.)
   Read my reply #4 here: 99 RB Atwood water heater spraying water from relief valve
   If you find it easier, replace the valve, but usually it just needs cleaning.   RonB