leaking gate pump valves

[Paulkildare]

Hope somone can help me with this . . . the valves on my central heating pump are leaking, not a major leak as yet, but must be happening for some time (see fungus in pic) . The pump is a Grundfos, and the valves only have a short nut with a slot for screwdriver. To make matters worse, it is behind the hot water cylinder, so you need to be a contortionist to get at it. Please see pic for valve type (and fungus just visible under pipework). Will I have to have these replaced, or is there an easy fix for these? Any advice would be most welcome. Picure is at link below
//www.diynot.com/network/Paulkildare/albums/

 

[kevplumb]

no easy fix fella

take them out

 

[doitall]

If you turn them slightly they may stop, but they are known to leak so replacement with the gate valve type is recommended.

 

[powell30]

Oh boy...those same valves are issued to us to use and all the engineers hate em, more so when we go to a job and see em fitted. Turn once and they leak.......permanently.

Drain down and replace em with gate valve type as has been suggested.

 

[kevplumb]

nothing wrong with them

as long as you dont turn them

 

[Paulkildare]

Entire estate of houses built using these valves, and I know that mine aren't the only ones leaking . . .! Guess I will have to bite the bullet and replace . . .anyone know a circus with a few contortionists that are handy with a wrench!!