Replacing hot water gate valve


Postby musicstate » Wed May 13, 2009 2:28 pm

I have a gate valve located in the airing cupboard that turns the hot water on and off. It has seized up over time and may need replacing. Are there any plumbing tips to try to unseize it or if it needs replacement what is the easiest way to change it. Do I have to turn off the cold water stop cock and drain all the hot water and the cold water tank? There is a hot water cylinder in the same cupboard and the gate valve is on a vertically rising pipe.

Thanks

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Postby htg engineer » Wed May 13, 2009 6:31 pm

Turn off mains cold water stop tap - run hot tap till the water stops - replace the valve - turn water back on - job done.


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Postby rosebery » Wed May 13, 2009 11:13 pm

I have a gate valve located in the airing cupboard that turns the hot water on and off."

and

"There is a hot water cylinder in the same cupboard and the gate valve is on a vertically rising pipe"

lead me to want to ask whether the gate valve in question is either fitted to the cold feed down from the CWST in the roof which goes into the BASE of the cylinder or fitted to the hot supply pipe out of the cylinder which comes out of the TOP.

Mostly it will be the former, I think thats what you are saying and I think thats what HE has assumed but some nagging little doubt wants me to ask you the question anyway because there'll be a slightly different solution.

Also please advise if there is a gate valve or stopcock on the ouitlet from your CSWT in the roofspace.

Cheers
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Postby Dave From Leeds » Thu May 14, 2009 2:24 pm

Further to what rosebery said, if the gate valve is on the cold feed to the base of the cylinder and the valve is below the top of the cylinder, then the cylinder will need to be drained down to below the level of the valve after the hot tap has stopped before removing the valve. If the valve is positioned higher than the cylinder or on the hot water outlet from the top of it then the method outlined by htg engineer is fine.
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Postby musicstate » Tue Jun 02, 2009 11:46 am

The valve is positioned higher than the cylinder, however I will check whether it leads to the base of the cylinder or whether it comes from the top of the cylinder. I will pay a visit to the CSWT to see if there is a stop cock fitted in the roofspace. If there is, is it better to disable the cold water supply from here rather than the main cold water stopcock?

Thanks for everybody's input on this!
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Postby rosebery » Tue Jun 02, 2009 5:06 pm

"I will pay a visit to the CSWT to see if there is a stop cock fitted in the roofspace. If there is, is it better to disable the cold water supply from here rather than the main cold water stopcock?"

Yes if it is on the OUTLET from the CWST.

Cheers
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Postby Dave From Leeds » Wed Jun 03, 2009 8:46 am

Even if it's on the inlet,, it is probably better to turn it off there. Saves turning the water off to the whole house.
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Postby rosebery » Sun Jun 07, 2009 11:30 am

"Even if it's on the inlet,, it is probably better to turn it off there. Saves turning the water off to the whole house."

Good point. My point (poorly expressed by the look of it) was that if its on the outlet that's ALL he needs to do. No need to drain tank either.

Cheers
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