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Any valve specialists out there help needed please


carlton1
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A long shot i know....we have a valve which cannot be closed. Not sure if it is a gate or globe valve. Any help would be really appreciated as we need to operate it on a regular basis. The valve wheel turns but as it bites it slips and just spins...i'm guessing something has sheared on the stem or gear. As its burried it will be a huge job to dig out and replace so i'm hoping i can fix it in situ...all help is appreciated!! I have a couple of pics but too large a file to upload...cheers.

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Usually either brass nut that is located in gate has stripped or threaded stem has corroded and lost thread.

You may feel slight jump when turning.

We use to use crane gate valves which were prone to this as gate would corrode and brass nut would break free of gate,we now use stainless ball valves.

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Hi,I used to swap handle and stem off new valve as valve seat was brass.

If you know valve make,type and size you may be able to swap stem and valve gate (presuming you can source spares)but obviously it would depend on if you can stop flow and whether valve body is is in good condition(my valves were 4" and had brass seat but not sure if this is usual set up).

If the valve is important and you can't identify model I'd change whole valve.

Hope this helps.

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You best check you haven't just rounded of the hand wheel where it fits the valve stem. I think you will be digging it out and replacing it for a new one, you will get a 6" ball valve you can turn by hand easily but it will have a rather large lever on top. You can get the long extention for the shaft for any hard to reach areas, not going to be cheap though.

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Defo replace it, no chance of repair. Don't use a crane or hattersley valve, they are all made in the same factory and are the most unreliable valves I have ever used and I fit a lot of big valves. They are an absolute rip of as well, a 6" will prob cost £600-£1000. Albion valves are the best value at the moment and good quality, al least half the price. Best thing to do is replace with a stainless butterfly valve especially if it's buried, most gate and globe valves tend to seize unless used fairly regularly. What's it used on is the other thing that determines the best valve type to use?

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Ball valve has less chance of leaking compared to a butterfly valve(ball is sealed to body with no shaft seals to leak).

If it's in regular use I would go for a stainless ball valve with extended shaft(supported).

I recently bought a flanged 4" stainless in new condition for £98 delivered off a well known auction site,though obviously if you buy new then price may be a factor in choice..

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Is the valve on water main? if its under mains pressure it will mean certain types of valve are better,age is another factor i dont think you will have a threaded pipe valve but a flanged one if old it will be to British table standards ie table D ring joint table E same bolts pcd but full face.

Edited by figgy
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Hi figgy...it been in for over 30 years so like you say it will be probably flanged. Its not on a pressured system and works on header pressure...im going next week to dig out around it, hope to get a makers mark...cheers for help.

Depending on the head height it could be under a fair amount of pressure. Every 1 meter of head height gives 1.4 PSI.

Edited by figgy
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