What I have seen being done is to add a vertical stub in the pipework that
traps air in it to provide a "shock-absorbing" function !!
Might be worth a shot for a half hours work.

Rgds
Alec
wrote in message
...
I have recently fitted a Torbeck valve to a toilet cistern, but
am suffering problems with a loud 'bang' from the pipework when
it shuts off. I have checked the archives and see that this
problem has been reported before, but a strange feature of my
installation is that if I dismantle and re-assemble the valve
it remains beautifully quiet for about a day, but thereafter the
hammer gradually returns to its original ferocity.

My water feed is from a tank, and no pressure reducer is fitted.
If I restrict the flow with the service valve I can stop the
noise, but the filling rate is then much slower than with the
original ball cock.

If I can make permanent whatever I am doing by dismantling and
re-assembling the valve it will solve the problem, but I have
no idea what that is.

Richard.
http://www.rtrussell.co.uk/
To reply by email change 'news' to 'richard'