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Leaking pressure valve - Ariston Water Heaters

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Vacuum valve leaking water


Question is unclear.
What is a vacuum valve?
You posted under electric water heater.
Water heaters are associated with TP or 'safety overflow' valve, water shut-off valve, tank drain valve, pressure-regulating valve, mixing valve and possibly a few other plumbing valves.
Vacuum valve implies that a compressor is creating pressure on one line while creating vacuum on another line. I don't know of a water heater that uses air compressor.
Open following link to help troubleshoot leaking water heater:
http://waterheatertimer.org/Leaking-water-heater.html

Jul 23, 2011 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

I have water leaking from a valve on top of my AO Smith PCGC 50 water heater.


Hi,
That is called a pressure relief valve....
If the water gets too hot, the pressure builds too high in the tank or the valve goes bad, it will leak...
Remember that this valve is a SAFETY device!!!
Do NOT plug the valve off...
Find out why it is leaking and get it fixed...

heatman101

Mar 26, 2011 | Water Heaters

1 Answer

Pressure releif valve leaking


Hot water pressure relief valves serve two functions. The first is to remove high-pressure water from the hot water tank. The second function is to act as a high temperature valve to remove water that exceeds a predetermined point for the valve. Both of these relief settings are preset at the valve factory. Many pressure relief valves will come with a metal tag that identifies these release points. If you're attempting to remove the hot water heater pressure relief valve, pay careful attention to ensure that you replace with the correct valve.

Your hot water heater has a pressure relief valve safety mechanism. When pressure inside the water tank exceeds certain limitations, the valve opens up to allow the pressure to be released. A faulty pressure relief valve will not release excess pressure, which could cause extensive damage to your home. You should test the hot water heater pressure relief valve once every six months to ensure proper operation. If the pressure relief valve fails the test, replace the valve with a new one immediately

Locate the pressure relief valve on your hot water heater. The pressure relief valve has a lever handle on top with a drain pipe attached to it. The pressure relief valve is most often on the side of the water tank toward the top. Newer models of hot water heaters have the pressure relief valve on top of the water tank.

  • Inspect the area around the pressure relief valve for signs of leaking water. If there is leaking water near the relief valve connection, replace the relief valve. If no leaking is evident, proceed with testing the pressure valve.

  • 3

    Examine the area below the pressure relief valve drain pipe. Most water heater closets either have a drain in the floor below the pipe or the pipe is inserted into another pipe to direct the water out of the home. If the end of your drain pipe is not in another pipe or there is no drain in the floor, place a bucket under the drain pipe to catch water when you test the pressure relief valve.

  • 4

    Pull the lever handle on the top of the pressure relief valve up with your fingers. A working lever will lift up without difficulty.You should begin to hear water going through the drain pipe. Slowly release the lever to shut off the pressure relief valve. The pressure relief valve is good. If you did not hear water running through the drain pipe, lower the lever on the pressure relief valve and replace the valve. If the lever is difficult to raise, do not force the lever. Replace the pressure relief valve.


  • Now with all that said if you have a closed loop water supply system and you have a pressure vessal/expantion tank it may have gone bad and is making the TP valve leak. you can call your water provider to see if you have closed loop system.

    Feb 04, 2011 | Whirlpool Water Heaters

    1 Answer

    Turned off the hot water to fix a leaking tap. now the tap has no hot or cold water and the hot water tank valve is leaking?


    It sounds like two problems.
    Problem 1) Clog inside faucet or clog inside pipes at faucet
    Remove supply tubes leading to faucet and see if problem is inside pipes or inside faucet.
    My bet is clog inside faucet.

    If you have galvanized pipe that meets copper pipe, this can be trouble spot.
    Article on clogged water pipes at Inspectapedia:
    http://www.inspectapedia.com/water/Water_Pipe_Clog_Repair_Guide.htm

    Article on clogged pipes:
    http://www.waterheaterrescue.com/pages/WHRpages/English/Troubleshooting/Tanklets/backflushing.html

    Problem 2) Water heater leak ... you say tank valve is leaking? Is that cold-water shut-off valve? Or tank drain valve? Or TP valve?

    If cold water shut-off is leaking, then replace shut off.

    If tank drain valve is leaking, then check if plastic valve is cracked. If drain valve is cracked, then replace with a brass valve from Home Depot. If plastic valve breaks off, then use hammer and screwdriver to gently chip out the broken plastic valve. New valve threads need teflon tape to seal pipe. If valve is just dripping, then put garden-hose cap over end of valve and screw down tight.

    If TP valve is leaking, then replace with same temperature and pressure rating.
    New TP valve threads need teflon tape to seal pipe.

    Problem 3) If pressure is low all over house:
    Buy pressure gauge at hardware store that screws onto hose connection.

    Test pressure on outdoor spigot.
    Open faucet and check if pressure drops. This says if problem is inside pipes that enter house.

    Test pressure on water heater drain valve.
    This says if pressure problem is before -or- after water heater.

    If problem is before the water heater, then shut-off valve located on cold water line is suspect.
    If problem is after water heater, it could be in hot water outflow pipe on top of water heater, or a nearby elbow.

    Remove hot water line leading from water heater and check pressure. This says if problem is where hot water leaves tank.
    Read articles above about clogs inside water lines.


    Nov 16, 2010 | Rheem Water Heater Pressure Relief Valve

    1 Answer

    Pressure relief valve


    The pressure relief valve only leaks when there is excess pressure in the system, possible causes could be excessive static pressure, overheating, faulty pressure vessel or undersized pressure vessel.

    Apr 11, 2010 | Rheem 50 Gallon FVR NATGAS Water Heater...

    1 Answer

    My releif valve wont stop leaking


    The pressure relief valve only leaks when there is excess pressure in the system, possible causes could be excessive static pressure, overheating, faulty pressure vessel or undersized pressure vessel.

    Apr 10, 2010 | Water Heaters

    1 Answer

    Leaking pressure relief valve


    what is the water pressure on the cold side? You may need to install a pressure reducing valve at the water heater inlet to reduce inlet pressure and keep pop off valve from opening when not needed.

    Feb 27, 2010 | Emerson Part UWL Chrome Ultrasystem water...

    1 Answer

    Boiler pressure


    If there is no leak anywhere in the system [pipes & radiators] Check the emergency pressure relief valve. It usually is at the base of the boiler and drains to outside [15mm pipe] where, if the valve leaks, water drips can be seen.. Looks similar to the picture with your query
    Renew the valve
    You can take it apart and clean it but I've never found that to be successful in the long term

    Dec 29, 2009 | Watts 3/4 Pressure Relief Valve

    1 Answer

    Combi boiler loosing water pressure in heating system no visible leaks i have heating pipes under a concreat floor carpets not damp and no con- densation on my windows the pressure drop is over...


    There is a 15mm pipe from the pressure relief valve which should so through to the outside. These valves are prone to leak after time. Look at the end [outside] of this pipe. Wet = leak from valve

    Dec 20, 2009 | Water Heaters

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