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Tool Talk Discussion Forum

well shutoff

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chvet73

11-28-2006 07:55:11




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I just returned from my vacation home over Thanksgiving and had a well problem. We use a well that is shared by 9 of us. When I turned on my underground valve it leaked constantly. The valve is the T-handle type which should bleed the non pressure side of the system, of water when it is closed, out of a weep hole. Unfortunatley it bleeds all of the time.
This happened about 2 years ago and I dug up the valve and relpaced it. That stopped it until this trip. The culprit seems to be sediment. Does anyone have any thoughts on how to prevent this from happening again and can it be cleaned out without digging it up again. Also is there a better type of valve I could use so this doesn't happen again. Any advice would be appreciated.

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Tom R Ne

11-28-2006 11:08:05




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 Re: well shutoff in reply to chvet73, 11-28-2006 07:55:11  
Are you using a standard Curb-Stop Valve with drain?

If so are you packing the area around the valve with good clean Gravel when you install the valve?

The whole area around the valve should be packed with Gravel under the valve and above the valve (for 8" or so) so the silt cannot infiltrate the weep hole.

Sometimes if you shut off the valve and pressurize the house side with air pressure you can get the seal to reseat.

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chvet73

11-29-2006 07:40:52




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 Re: well shutoff in reply to Tom R Ne, 11-28-2006 11:08:05  
The valve is the standard stop type. That is not a ball valve. It turns one way on and back the other to turn it off. There is no gravel around it. I suspect that is part of the issue. It takes some time for the water that comes out to drain way. I believe the valve has what is refered to as tapered plug.



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chvet73

11-29-2006 07:42:42




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 Re: well shutoff in reply to chvet73, 11-29-2006 07:40:52  
I forgot to add, it only turns about a half turn in each direction way.



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Tom R Ne

11-29-2006 08:19:45




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 Re: well shutoff in reply to chvet73, 11-29-2006 07:42:42  
It sounds like you may have an inverted plug valve, on most of those the large end of the plug is on the bottom of the tapered plug and there is a leather cup fitted to the bottom so that the incoming pressure pushes the plug upwards causing an interference fit with the taper in the valve body.

Each time you operate the valve the plug pushes down and the incoming pressure must lift the plug back up until it is tight enough that there is no leaks around the plug. If there is silt or sediment in the valve this can cause the leather cup not to seal in the valve body and the plug will not lift up to seal in the tapered body.

Some times if you apply an air pressure that is greater than the incoming water pressure (at the house side) and open and close the valve a few times you might get lucky and blow out the valve enough to cause it to operate ok. If the leather cup is scored this is not going to work.

If it become necessary to replace the valve it might be better to go with a ball type of Curb and waste valve. Whichever type you use pack it with gravel to eliminate the external infiltration.

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Tom R Ne

11-28-2006 13:42:10




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 Re: well shutoff in reply to Tom R Ne, 11-28-2006 11:08:05  
It would be helpful if you knew what type of valve you have!

Do you know if it is a ball, a gate , or inverted plug?

Does the valve have stops so that you turn in one direction to shut it off, and the opposite direction to turn it on, or do you always turn it one direction?

Do you turn the valve a portion of a turn or more than 1 turn ?



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souNdguy

11-28-2006 08:11:03




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 Re: well shutoff in reply to chvet73, 11-28-2006 07:55:11  
what about installing a sediment trap with a cleanable bail strainer before the valve?

Soundguy



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chvet73

11-28-2006 08:29:38




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 Re: well shutoff in reply to souNdguy, 11-28-2006 08:11:03  
The problem with anything before the shutoff, is that the pipe is underground from the main all the way to the house. So you can't have anything that needs service on the line until it gets under the house. Yet a shutoff is needed to shut my house off from the main to prevent freezing when we are not there.



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souNdguy

11-28-2006 08:34:28




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 Re: well shutoff in reply to chvet73, 11-28-2006 08:29:38  
I guess there is no way to put in a manhole type 'clean out' cover there so you could service it.. ?.. along with an aux shutoff/ bypass setup?

soundguy



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satsop

11-28-2006 09:06:34




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 Re: well shutoff in reply to souNdguy, 11-28-2006 08:34:28  
What about putting in a shutoff valve then a tee with a second valve devoted to just drain the system, screen the second valve some how to keep dirt ect. from getting in. Just a thought.
Jim



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