Stopcock Replacement

[cjd]

I would be grateful for advice on replacing the stopcock in the picture attached.

The stopcock is feeding an outside tap which is giving a very poor flow rate and I have been unable to move the stopcock in either direction to decide whether it is partly closed or not. Obviously for this reason putting another stopcock behind this one will not be the solution.

The black plastic pipe has an outside diameter of 21.5 mm and from reading other posts on here it seems this would require a 3/4" olive to be used in a 22mm fitting.

With this in mind if I use https://www.bes.co.uk/brass-stop-cock-22-x-15mm-23524 with the 3/4" olive would I be correct?

Only other thing is whether the black plastic pipe will need a pipe end insert to be fitted.

Thanks for any ideas or suggestions you may have.

Garage Stopcock2.jpg (325.79 KiB) Viewed 1624 times

[aeromech3]

You might be lucky to re-use the olives, 22 / 15 valves are common and available at places like screwfix item 98486 and you should have an insert inside the poly eg: item 33270.

[gas4you]

If all else fails take a cut off from the black plastic to your local drain center. They have been the only ones to help me out in the past.

[cjd]

Excellent, thank you gents.

[wes56]

why not isolate the stop cock line and using an adjustable and grips remove the works ie the spindle from the body. no need to remove the valve from the line.
then check for debris or damage.
run the water for a minute and watch the flow. if its improved then
replace the washer and maybe pack with PTFE tape or rope an re-assemble.
if the flow is still bad then the problem is not the isolator.

dont go cutting off-cuts from the plastic pipe unless theres some spare slack.

you realy need a handle.

[cjd]

thanks wes56, yes I have tried removing the guts of the valve but go nowhere with that and until I have replacement parts to hand I am reluctant to get brutal in case I cause damage and am left without water.

Is there any reason not to use a ball type valve rather than the stopcock type device I already have?