On 25/02/19 17:26, Mark wrote:
"Jeff Layman" wrote in message
...
On 24/02/19 17:10, Mark wrote:
"Jeff Layman" wrote in message
...


I'm considering using one on the cold-water tank to see if it stops
the
loud water hammer and "foghorn" we have. I've got it under control by
partially closing the isolating valve on the mains water supply to the
tank, but that's not really a satisfactory solution.

If it has a large DIAPHRAGM WASHER like this change it and make sure you
get
it the correct way round
they harden with age and cause water hammer

https://images-na.ssl-images-amazon....L._SL1500_.jpg

The float valve was brand-new in November.
https://www.screwfix.com/p/pegler-brass-part-2-float-valve/27627

Next time I remove it I'll have a look at the diaphragm.

have you read the feedback on screwfix seems as if PEGLAR have some quality
issues
I have fitted loads of these in the past without problems and only had to
change diaphragm after 10+ years
so still think if you fit a new Diaphragm ( perhaps Not from Screwfix) it
would cure the problem
https://vgy.me/AX1qON.png

I think it's a combination of the valve and input water pressure/flow.
The original was a Screwfix "cheapie" which had worked well for about 4
years. It started to make a hammer noise a few weeks after the gas CH
boiler was replaced. Coincidence?

Taking apart and cleaning the valve would improve (but not completely
remove) the noise for a day or two, but then it would get bad again. I
decided to replace it with the Pegler, but that immediately turned the
hammer into a foghorn. Fiddling with it would again improve things for a
while. In fact, once it didn't make a noise for about 4 weeks, then just
started again out of the blue, and once it had started rapidly got worse.

--

Jeff