Can I use 1/4 turn ball valves in place of gate valves for my CH/HW
system. My previous experiences with gate valves suggest that seepage
past (when in the closed position) is a problem. I would like to be
able to turn-off the feeds to each bathroom for hot and cold water.
Ball valves look quicker to use, but I don't know if there is any
reason I should avoid them for this purpose.
On 5 May 2004 07:17:14 -0700, email@example.com (Stephen
They are ideal for this. Last time I did some work on my heating and
HW systems, all the gate valves were consigned to the skip and
replaced with lever ball valves.
Also, they are a good solution as isolating valves for taps where you
need full bore flow.
To email, substitute .nospam with .gl
I wouldn't rely on it. However, the brand I used appeared to be as good as a
gate valve in shutoff, when I blew down one end. I would definitely fit
specific isolating valves if I needed such isolation, though.
The main reason for not using a ball valve in a circuit is that shutting a
flow off quickly can produce water hammer. Isolator valves are normally only
used when there is little or no flow, so it is not a problem for that
application. Depending on the circuit layout, it may or may not be a problem
when used to cut off circuits that could be carrying a flow. 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.
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.
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?
strung together this:
That is why I suggested a suck it and see approach after making the point
originally. However, in other applications, it can happen and then I would
want to have a solution that relied upon the equipment design, rather than
on operating procedures. Procedures as the only way of avoiding problems is
always the last and least desirable option for any safety system.
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