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I NEED TO BUY A TP192 PRESSURE RELIEF VALVE IN AUSTRALIA

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SOURCE: gravity feed boiler/ american standard model#g27dpgc

your make up water pressure is greater than the safety relief pressure. The safety should be 30psi lift. the makup usually goes through a regulator called an automatic makeup valve. these valves operate infrequently on a closed system and get rusty. They stick. If yours is stuck open, then your makeup water pressure which is probably greater than 30psi is overpressuring your boiler.

Posted on Sep 30, 2008

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My pressure relief valve keeps blowing more so when it is hot any ideas please


Pressure relief valves open on high temperature as well as high pressure. They do go bad and are replaceable.

Consider calling the plumber. It is not very expensive part and the plumber can change it quickly.

If you just want to do it yourself:
  1. Write down the make and model of the water heater.
  2. Go to a real plumbing store and buy a new one.
  3. Turn off the heat source (the gas or electricity)
  4. Turn off the water inlet and open a hot water valve at any sink to take the pressure off the heater.
  5. Remove the old relief valve. It may take a long handled wrench.
  6. Install the new pressure relief.
  7. Close the sink valve.
  8. Turn on the water and check for leaks.
  9. Turn on the heat source.

Good luck.

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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.

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