Welcome, my name is XXXXX XXXXX I will do my best to help you with your issue.If the knocking is a single bang/knock then you probably have a water hammer condition and installing water hammer arrestor(s) (basically a shock absorber) on the water line to the shower should solve the problem. If the knocking is a series of knocks then you probably have a defective cartridge in the new shower valve. Replacing it will probably solve the problem and since the valve is so new it should be under warranty so you should be able to get the part at no charge.
as i said we tried the hammer arrestors and it made no difference and we also tried a brand new shower head and the a shower valve, still did not make a difference!
I didn't see any mention of water hammer arrestors
Oh so sorry did not mention them because i could not remember their name. we put 4 on: 2 on the tub and 2 on the hand basins
Oh so sorry did not mention them because i could not remember their name. we put 4 on, 2 on the tub and 2 on the hand basins
What is your water pressure?
and i did not mean to enter that 3 times:(
i'm not sure, however this house is a 1978 and when we bought it there was no problems for 2 years, this only happened after the plumber came.
Well, excessively high water pressure can also cause this problem. There is no explaining why this is a new problem. I'm assuming we're talking about a single knock when you shut the water off
by the way we did reduce the pressure by turning the shut off valve to less pressure and it does not go away unless there is a dribble of water.
and yes it is one knock
Throttling down the shut off valve won't affect the water pressure. It only affects the volume of water flowing
yes this is also making us pull our hair out because nothing logical is working
Is this from both the sink and shower cold water?
OK but if there was no problem before the plumber, but only after he changed out the faucets...
and the tub
Like I said there is no explaining why you didn't have this problem before except perhaps that now you have faucets that shut off quicker. You need to check the water pressure since it''s the only variable you haven't looked into yet. It must be below 75 psi.
OK how do i check the water pressure
You have to put a gauge on the water line. The easiest way to do this is on an outside faucet. You can either buy a test gauge with a female garden house fitting attached or you can make one up with a water pressure gauge and a 1/4" female X female garden hose adapter. You screw the test gauge onto the outside faucet then turn it on
OK Rick we will try this tomorrow, if it is 75 psi can i get back to you?
Just post to this thread. It won't go away even after you rate me favorably
You can get back here by logging back into your account
i'm not savvy when you say get back to this thread but I'm sure my husband will be able to. thanks
You're welcome. All you have to do is log back into your account here and you'll see a link to this question. Or you can just bookmark the page
by the way if it is too high how do we reduce the pressure?
You have to install a PRV (pressure reducing valve) on the water main
Ok i will get with my husband who hates plumbing and this on going problem and see how the pressure is many thanks.