In article ,
"Roger Mills" writes:
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

Snap!

fibre washers which seem to have perished. Tightening helps a bit but there
is still a slight drip . . drip.

I couldn't find any fibre washers of the right size. I temporarily used
an O-ring, until I could do a proper repair.

I intend to replace the valves - probably with ball rather than gate types
(any comments?).

Yes, they are a different length, so you'll need to modify the pipework.
I just replaced mine with identical gate valves.

--
Andrew Gabriel