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I’d take the opportunity to replace it with a full-bore ball valve like this
https://www.screwfix.com/p/pegler-tee-ball-valve-red-15mm/29086
You might even find you get better flow at taps and shower etc.
This stopcock-type tap is leaking from the gland nut.
It's on the incoming hot water pipe into my flat (the boiler is in an outhouse).
Before I repack the gland with PTFE tape, I'm wondering about another strange thing. Fron fully off, as I turn the tap anticlockwise the water begins to flow. Then as I turn it a bit more, the water stops again. Further turning in the same direction allows the water to flow once more.
Why is it behaving like this, and does it indicate something broken or unusual that I should be aware of?