Replacing gate valve in hotpresd

Fingers Mcginty

Gate valve with the red wheel is passing. It's 3/4 with compression fittings. I need a decent replacement and like the look of this one. Should be a handy enough job?
I presume the pipe work is 3/4 as the existing valve had 3/4 embossed on the side?


https://www.mcmahons.ie/lever-ballvalve-3-4-cxc

Its for the hot water feed from my cylinder to the hot feed on the shower pump.

Fingers Mcginty

Excuse the typos ....predictive text

Sleeper12

Lever valve is the way to go. I never fit anything else. Foolproof, never seize up & never passes water. I won't let you down in an emergency.

Pipe should be 3/4 inch. Turn off mains feed and drain the tank in the attic. It's simple enough to replace the valve.

Fingers Mcginty

Thanks. ..i don't think I need to drain the tank in the attic though? It's the hot feed to the shower pump I'm isolating which is coming from the top of the cylinder.

agusta

Fingers Mcginty wrote: »

Thanks. ..i don't think I need to drain the tank in the attic though? It's the hot feed to the shower pump I'm isolating which is coming from the top of the cylinder.

There should be a valve on the cold feed to the cylinder.this valve will turn off the hot water

Tom44

You shouldn't fit a valve on the outlet side of the cylinder.

Make sure open vent isn't restricted.

agusta

its a service valve for the shower pump

Tom44

agusta wrote: »

its a service valve for the shower pump

OP mentioned 3/4" off the top of cylinder, without photo we cannot assume anything, as 3/4" is on the big size for a shower pump. Hence my pointing out not to restrict expansion pipe.

whizbang

Have a look at the inside diameter of the valve. There's some around that are about 10mm internal..!

antiskeptic

Fingers Mcginty wrote: »

Thanks. ..i don't think I need to drain the tank in the attic though? It's the hot feed to the shower pump I'm isolating which is coming from the top of the cylinder.

Er, the cylinder is fed from a tank in the attic. Which means the pipe from the top of the tank is fed from the tank in the attic. Whilst the pipe might be higher than the top of the tank, it's not higher than the tank in the attic.

If there's nothing isolating the cold feed to the tank near the tank then you need to drain the tank.

Fingers Mcginty

antiskeptic wrote: »

If there's nothing isolating the cold feed to the tank near the tank then you need to drain the tank.

Luckily there is a cold feed isolation valve on the tank.