Can't really see water hammer being a problem in a CH circuit, as I would be
unlikely to want to turn off a zone if there was a demand on it at the time,
so when you operate them in this application there should be no flow, and
anyway the pressure on a CH flow is not very high is it?

Fash

"Lurch" wrote in message
...
On Thu, 6 May 2004 08:13:17 +0100, in uk.d-i-y "nightjar"
strung together this:

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.

Fairynuff, just a thought. I manage it but not everyone has to.
--

SJW
A.C.S. Ltd.