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Old 03-25-2010, 07:33 PM   #1
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Tell me I did not waste a day...

Spent the day replacing the pressure release valve. Ended up using 1/2 inch pressure release valve with 75 psi. On one side is a shut-off valve that goes to a clear plastic drain tube. The other side goes to the pressure regulator. Turned the water on and no leaks. But also no water coming out the clear plastic drain tube when I opened the shut-off valve. What did I do wrong?
Thanks. Jack
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Old 03-25-2010, 07:54 PM   #2
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Just a guess from an idiot plumber. Could it be air pressure in the line. Try opening a faucet downstream of the pressure relief valve until you have flow. Then go back and try to open the shut off valve again.
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Old 03-25-2010, 08:04 PM   #3
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Quote:
Originally Posted by Skamper1 View Post
Spent the day replacing the pressure release valve. Ended up using 1/2 inch pressure release valve with 75 psi. On one side is a shut-off valve that goes to a clear plastic drain tube. The other side goes to the pressure regulator. Turned the water on and no leaks. But also no water coming out the clear plastic drain tube when I opened the shut-off valve. What did I do wrong?
Thanks. Jack
A pressure relieve valve is on the output of a water heater and such ... it should not be inline with water supply ... ( if indeed that it is ...). A shut off valve and a pressure relive valve should not co-exsist. Your description does not make any sense. Perhaps a picture?
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Old 03-25-2010, 08:12 PM   #4
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I basically replaced existing plumbing. Will try to show a decent picture, but may have to reshoot tomorrow. Had all faucets open. Have not tried water heater, so maybe this has soemthing to do with it. 1st pic is plumbing heading back to pressure release valve, 2nd pic is busted pressure release valve and 3rd is shut-off vlave leading from valve to clear plastice drain tube. Thanks. Jack
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Old 03-25-2010, 08:46 PM   #5
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You should not have any flow through the clear plastic tube if it is operating properly.

The purpose of the pressure relief valve is to exhaust water from the system if the water pressure rises above 75psi. If your water pressure is below 75psi there should not be any water leaking out through the clear plastic tube.

The clear plastic tube should pass through the floor and belly pan to outside of the trailer.

You do not need a shut off valve on the outlet side of the pressure relief valve. If there was one there before it was probably put in by the PO to stop a leak in the pressure relief valve. Take the shut off valve out. If there is a continuous leak through the pressure relief valve when the pressure is below 75psi then it is defective.
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Old 03-25-2010, 11:16 PM   #6
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You do not need a shut off valve on the outlet side of the pressure relief valve. If there was one there before it was probably put in by the PO to stop a leak in the pressure relief valve. Take the shut off valve out. If there is a continuous leak through the pressure relief valve when the pressure is below 75psi then it is defective.
In fact, this is prob. what blew the top of the pressure relief valve off; designing the exhaust side of such a valve to fail in case of excessive back pressure is a good idea from a safety standpoint.
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Old 03-26-2010, 07:05 AM   #7
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Before I replaced the old pressure relief/release valve when the water was turned on a spout of water three inches tall came out of the top of it. Kind of like a small tabletop fountain. Would have thought with city water psi the spout would have been more and more forceful. The other two handles drain the water systems. Just surprised when I opened the "new" shut-off valve NO water came out. Jack
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Old 03-26-2010, 01:34 PM   #8
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Right. When you open the new shut off valve NO water should come out. Take the "new" shut off valve out and plumb directly from the new pressure relief valve to the clear plastic drain line.

When you turn on the water you should see nothing coming out of the top of the new pressure relief valve, and the only time something should come out of the clear plastic tube is if the water pressure is above 75 psi.

Probably the reason why you had a fountain coming out of the old pressure relief valve was that the valve was worn out and the shut off valve was closed. There should never be a shut off valve downstream from a pressure relief.
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Old 03-26-2010, 04:53 PM   #9
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Thanks for all the information. Luckily the easiest part is to remove the "new" shut-off valve. I appreciate all your help. Now it all kind of makes sense. Jack
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