Faulty PN16 Gate Valve

[Foston]

I have a PN16 Gate Valve that turns but does not stop. i.e. it simply keeps turning. Is it possible to replace the centre screw mechanism [even if I need to buy a complete valve to obtain the spare part] or will I need to replace the whole valve. The question arises because I cannot see how to easily cut off the supply of water to the pipe [cold] and I thought that freezing the pipe may be an option, in which case changing only the centre of the valve seems a possible safe solution.

 

[Phil]

Can you not just go into the loft and bung the tank?

I've only tried to swap the innards live once, it didn't end well.

 

[ShaunCorbs]

the whole valve and whats it on cold mains ?

 

[AlexGas]

I cannot see how to easily cut off the supply of water to the pipe [cold] and I thought that freezing the pipe may be an option...

Have you got a pipe freezing kit!? Can a plumber make it easy for you!?

 

[snowhead]

You'd have to buy exactly the same make / model and the designs sometimes change over the years so it's not a guarantee it would fit.

Change it for a lever valve.

 

[rpm]

Used to refurb gate valves, big ones and to do it properly you have to grind the 4 faces to remove any pits, know your working to a smaller scale but the problem is still the same so changing the inners on there own will have limited effect.

 

[lame plumber]

valve is knackered, sheared spindle, just get it replaced - refurbining the spindle is a waste of time on an old domestic gate valve

 

[rpm]

valve is knackered, sheared spindle, just get it replaced - refurbining the spindle is a waste of time on an old domestic gate valve

Agree, welding and metal spraying a shaft that size is just not worth the effort, time for a new one.