Under water service or isolation valve

[stussy]

Hi,

This may seem a stupid question but can service valve's be used underwater? If not, are there any that can be used under water? The water is about 50cm deep.

Thanks,

Stuart

 

[Alex Knight]

What's the pipe feeding? And what's the water? Pond?

 

[stussy]

Water fountain. The water is treated by with chlorine

 

[Gasmk1]

dont they make plastic valves now

 

[rpm]

All the ones I`ve seen were placed outside the pond / lake.

 

[jonnyswamp]

25mm plastic stop taps are used underground, so in theory can be used under water
Plasson or Poly, can't remember which, but they came from Plumbcenter

 

[Alex Knight]

Plastic should be fine, just make sure you use a back flow prevention device where the supply leaves the house

 

[stussy]

Thanks for the help

 

[Howsie]

Plastic should be fine, just make sure you use a back flow prevention device where the supply leaves the house

Proper air gap necessary for that.

 

[Alex Knight]

Proper air gap necessary for that.

But we all know that's never going to happen in this circumstance so a double check will be better than nothing

 

[stussy]

Not fitting, just repairing. The current isolation valve has failed and was wondering if it was because it was incorrectly used underwater. Thanks

 

[Howsie]

But we all know that's never going to happen in this circumstance so a double check will be better than nothing

Why not?

 

[Alex Knight]

Why not?

Because I didnt think the OP was a Plumber just checked seemed I was wrong, still be surprised if it is fed from a tank though

 

[stussy]

The fountain isn't feed from the mains at all. It is topped up by a Jose a's and when. The isolation valve is after the pump, before one fountain outlet. The OP is a plumber but I have never come across another instance where a service valve is submerged.