Water hammer

[malc]

Hello everyone, I have a customer who is experiencing what sounds like water hammer.
When using the shower the noise starts, but only seems to be in the hot system, a vibration can be felt coming from the hot tap at the kitchen sink. If pressure is applied by pressing down on the tap (not turning it on )
the noise stops.
I have attended before and repaired leaking taps and a wc inlet valve that kept letting by.
They have a megaflow cylinder.
I haven`t checked the incoming pressure but wonder if it`s too high, and fitting a pressure relief valve on the incoming main would solve the problem.

Thanks in advance for any help,sugestions or advice.

 

[PlumbBobBob]

could the tap valve itself be loose/not tight enough as the water hammer stops when tap pressed down

 

[Guest123]

Have you tried reseating the tap and washer? Or if ceramic disc, check that the cartridge isn't broken?

 

[Best]

When pressing down on modern tap heads it does push the works & washer down slightly. So check washer (as washers can be too soft or too large & can cause noise) or change works or entire tap if you have to. If it is ceramic disc then prob best replace works although the bottom sealing washer can be a bit perished. Surely the Megaflow has a pressure reducing valve on it which should be checked. Obviously get someone qualified on u.v. systems if you are not.