Leaking lockshield gatevalve

[darren-]

Heys guys, looking for some help with a job i got today.

The problem i'm having is that as soon as i open the valve, water leaks from the spindel.

Normally easily fixed by re-packing the gland with PTFE. But these valves don't have gland nuts. There are a few of them throughout the school i'm working in and they are all the same. Never had to fix one of these before so i'm hoping someone can shed a little bit of light on it for me.

Cheers.

 

[WHPES]

I presume you are talking about radiator lockshield valves (these are NOT gatevalves). Actually not many lockshields do have gland nuts and packing in the traditional sense like stopcocks.

Usually its o-rings, but you are as well to whip them off and put new valves on as mess about chaning the o-rings.

 

[darren-]

No, it's very similar to this except 35mm and about 30 years old. When i unscrew the shield i can see to the spindle but no packing gland.

 

[Blackcatgas]

yeas Ive had this before, undo the shield, turn off the valve/adjust then replace the shield, as soon as youve replaced that the leak stops?.

 

[darren-]

No the only way it stops is to shut the valve, with or without the shield. Thought maybe someone would know a way to repair it without having to do a drain down and renew.

 

[WHPES]

Ah one of those - generally just whip em off and put new ones on - usually gunked up inside anyway.

 

[stevetheplumber]

the lockshield is the packing gland on this type of valve theres no stuffing box to hold packing the lockshield forces a wedged shape brass ring down the shaft which is why you should have a3way key for turning them on and of as taking the lockshield of can disturb the seal

 

[kay-jay]

have you at least tried to stop it with a bit of loctite 55? i never use ptfe for this as one turn of the valve and it leaks again

 

[darren-]

When i got there the janitor had already taken the lockshield off to try and tried to fix it himself. It leaked with or without the lockshield so i just replaced the valve today. Cheers guys