Leaking drain valve on Hot water cylinder. Advise please

[matt68]

Hi All, I have a leaking drain valve off the CW inlet on a Range Cylinder. Am I right in thinking I have to empty the Cylinder below the CW inlet to change the valve? To isolate cold water to the tank to prevent refill, should I just lock off the 1 stop CW inlet or all 3 red stops?
Turn mains water off
Turn boiler off
Isolate water to tank
Run hot and cold taps until stop
Attache hose to drain valve and empty down cylinder.
Replace old drain valve for new.
Open all stops and re fill tank
Re pressure system.
Please find attached photos
Many thanks
Matt

 

[Deleted member 120897]

Have you tried to tighten up the screw?

 

[matt68]

Have you tried to tighten up the screw?

Yes, 1st thing I did

 

[Deleted member 120897]

Since it’s on the cold inlet, you might just be able to turn the mains off and renew the drain off washer?

 

[matt68]

Since it’s on the cold inlet, you might just be able to turn the mains off and renew the drain off washer?

But wouldn't the water in the tank that's above the cold water inlet just drain out of the tank after having removed the drain valve? There nothing to stop that from happening.

 

[Deleted member 120897]

It’s possible, I’m not 100% how these work. So then turn off the cold main, attach a hose pipe and direct into a bucket, open the drain valve if water doesn’t flow, should be ok, if water does flow, keep emptying until water stops flowing.

 

[matt68]

It’s possible, I’m not 100% how these work. So then turn off the cold main, attach a hose pipe and direct into a bucket, open the drain valve if water doesn’t flow, should be ok, if water does flow, keep emptying until water stops flowing.

Yes that's the plan.. Thanks

 

[newbie184]

Have you done this, did it work?

Also, doesn't work on these unvented cylinders require G3 cert?