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Leaking lockshield gatevalve

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darren-

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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.
 
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.
 
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Herz_Valves_UK_Compression_lockshield_gate_valves_1.jpg


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