On Sunday, August 3, 2014 12:42:29 AM UTC-4, Harry K wrote:
On Saturday, August 2, 2014 11:47:28 AM UTC-7, Pico Rico wrote:

"Harry K" wrote in message

...

On Saturday, August 2, 2014 10:56:52 AM UTC-7, Michael Wilson wrote:



First call, longtime listener.



I'm changing out the water pressure tank, but I don't have a shut off

valve from tank to well to drain the tank. If I turn off the breaker to

the well pump, will this effectively shut off the water so I can drain the

tank and replace it? Help much appreciated.



Mike



Yes, and while you are chaning it out, you should install that missing

shut-off valve.



Harry K



I have never seen a well pump with a valve (other than a check valve) on its

outlet to the pressure tank.



And I've never seen one without it. Every appliance using/supplying water should have one for just such a reason. It recently cost me $120 to have a shut-off installed on the well line entering the house where I forgot to specify it when the well was drilled. That was an unusual situation though.. I had a leak and needed to shut that line off to isolate it.



Harry K

You're confusing a shutoff valve for the water supply *to the house*, with
a shutoff valve between the well and tank. Of course there should always
be a shutoff between the tank and the house. But I've never seen one
between the well and tank. What purpose exactly does it serve? Assuming
it's a submersible, all it does is block the flow of water into the tank
which you could just as easily do by shutting off the breaker.
If the tank has 60 gallons of water, that water will still be available
to run into the house, unless there is a valve between the house and tank.