I have gate-type isolator valves either side of my circulating pump. These
have recently started leaking slightly - not from the gland round the shaft,
but from the point where the gate mechanism screws into the body. They have
fibre washers which seem to have perished. Tightening helps a bit but there
is still a slight drip . . drip.
I intend to replace the valves - probably with ball rather than gate types
(any comments?). This will, of course, require the system to the partially
drained - so I need to wait for a convenient time - and need a short-term
In a recent post concerning a leaking joint on a radiator valve, someone
suggested using a silicon sealant. However, all the tubes of sealant which I
have got state that the surfaces must be clean and *dry*. There's no way I
can make my surfaces dry - until I fix the leak!
Does anyone have any suggestions of anything I can put on a damp surface,
which will still seal?
I had the integral 1/4 turn ball type pump valves to convert from 22mm
pipe to the pump flange. The first and only time they were used in
anger they promptly started leaking from around the ball handle. I
changed to the gate valve type of pump connectors.
My feeling is that these combination flange adaptors/valve are poor
quality and suffer from infrequent use. My preference would be a high
quality full bore ball valve (1/4 turn) and a separate adaptor flange.
Thanks for that comment. Unfortunately, I don't have room to install
separate flanges and ball valves - it has to be the integral type. Maybe I
would be safer sticking with the gate-valve type.
Roger, I've implemented what Ian describes and it is a better
solution than any of the gate valve options.
If you are stuck for space, an alternative is to put flanges at the
pump and then a drain cock on the appropriate (lower) side of the
pump. Then put the lever ball valves some distance away with a
manual air vent if needed on the pump side.
Now you can close both valves, open the vent, open the drain and empty
the entire section of pipe and pump. OK, so there is a little more
loss of water from the system but not a substantial amount.
To email, substitute .nospam with .gl
I presume that the ball type are shorter - so I'd have to lengthen one the
pipes, which wouldn't be a problem. Someone has suggested that the ball type
is more leak prone than the gate type. Does anyone else have a view on this?
Does anyone know whether or not the integral ball type are full bore?
Two of my close relatives have gate valves on their pumps and I have ball
None of us have ever had a problem...
Never leave a gate valve for a long time in the fully wide open postition or
they seem to stick wherever they are fitted; always back off from fully hard
open say a 1/4 turn.
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