"Lurch" wrote in message
...
On Thu, 6 May 2004 00:15:32 +0100, in uk.d-i-y "nightjar"
strung together this:

The answer is
probably to try a ball valve and, if it produces water hammer, replace it
with something that closes slowly, like a gate valve.

Or, close the valve slowly.

That is not an acceptable solution, even if it is possible to close a
quarter-turn valve slowly enough. It is a basic principle that one day
either you will forget or someone else will operate the valve, which could
blow a pipe fitting off somewhere.

Colin Bignell