The water pressure in my house is 140psi, but when I turn something on it goes back down to 40PSI. Help?

Answer 1

if your pressure is really 140 your relief valve on you water heater would be blowing off.If to have city water call the water department.if you have well water call plumber or well guy to check your pressure tank

Answer 2

Two possibilities.

The 140 psi may be due to pressure surges. Crack a valve open just a little and see if the pressure drops appreciably. lose the valve and see if the pressure stays low for a while. If so, the problem is surges.

Possibly there is excessive friction loss in the piping, metering, pressure regulating device between the public main and where you take the reading. This could be due to corroded pipes, partially closed valves, defective meter, defective pressure regulating device.

Of course 40 psi is sufficient for most household service.

Answer 3

All you need to do is get a new pressure reading from a local plumber or your water purveyor. You possibly have a Pressure Regulator that has failed. Regardless, you need to have the pressure below 80 psi. Another possibility could be a clogged or pinched water line. However, the pressure drop is consistent with a pressure regulator failure.

Answer 4

Not sure how you took the pressure reading. I have never seen that much pressure on a waterline. Sounds like you have something putting air into your water lines.

Answer 5

That doesn't sound right. The pressure switch could be wrong, check it. I don't think you could get that much pressure in a line without blowing it. Mine is all copper and 65 pounds and scares me. Check it out real good with a new switch.

Answer 6

if you water heater is popping off then you might have a back flow preventer without an expansion tank.. do you get a big burst when you turn the faucet on? is it everytime? guage could be bad.. i doubt the city even pumps that hard.. if its a well then could have a bad regulator

Answer 7

You need a new pressure regulating valve