On 11 Aug, 09:43, "Dave Liquorice"
wrote:
On Wed, 11 Aug 2010 01:45:04 +0100, Spamlet wrote:
The gate valves:http://en.wikipedia.org/wiki/Gate_valve*should have
several turns on them and they are very often stuck.

Yes, ******* things.

They are meant to be fully open or fully closed.

Not *fully* open, that is a guaranteed way for the crud/corrosion to
jam 'em up very firmly. You stand slightly more chance of them not
jamming if you fully open then close them half a turn or so. Also
it's a good idea to fully close and reopen them every so often, like
once a year.

If I ever take any of the gate valves out here they will be replaced
with full bore ball valves. Note "full bore", most ball valves are
not full bore and will restrict the flow, gate valves are full bore.

--
Cheers
Dave.

It's not the fault of the vave design, it's the cheap and nasty metal
they'r made of.
Ball valves go exactly the same way if cheap and nasty.