Double Check Valve

[WillyWarbux]

I've had my old stop cock repositioned. When I had a look at the work, a double check valve has been installed directly after the stop cock. Is this normal?

I ask as it's making quite an annoying vibrating sound whenever any tap is on in the house. So I'm wondering if the plumber needs to replace with a better quality valve, or is it even necessary in the first place?

Cheers

 

[oldbutnotdead]

Not compulsory on the whole house supply, can cause problems if you have a combi boiler.

 

[Madrab]

Can fall under local bylaws, certain boards require a double check valve after the stop tap to protect the mains, especially in flats or premises on a shared main. It's good practice to have them fitted IMO, especially as there are now more and more 'illegal' fittings/outlets being attached to the mains in some properties.

If it's chattering then time to replace, the valves/channels inside do wear.

 

[CBW]

If it’s recent then ask the installer why it’s required, as above, could be a regulation set by the local water undertaker. Make sure the arrow is pointing the correct way, as valve could be faulty and fitted incorrectly.

 

[Johntheo5]

As post #2, can cause problems with combi boilers, especially if they have a preheat function and can cause the PHE to fail due to over pressure, some maunufactrers stipulate that a expansion vessel be installed.

 

[TeaAndBiscuits]

Usually fitted if you have a water softener too.

 

[WillyWarbux]

Can fall under local bylaws, certain boards require a double check valve after the stop tap to protect the mains, especially in flats or premises on a shared main. It's good practice to have them fitted IMO, especially as there are now more and more 'illegal' fittings/outlets being attached to the mains in some properties.

If it's chattering then time to replace, the valves/channels inside do wear.

Ah! Yes it's an old 1920s ex-council house with shared mains. So that sounds like the likely reason.

However - It's brand new, so it won't be worn out yet.

 

[CBW]

However - It's brand new, so it won't be worn out yet.

Could be the stopcock then?

 

[WillyWarbux]

Could be the stopcock then?

Well I mean - Both stop cock and check valve are brand new. And I presume the check valve has moving parts and more likely to make sound. Plumber will be having a look anyway, I just wanted a little more information to arm myself incase he fobs me off with "they all do that".

 

[Johntheo5]

Any photo of the check valve??, make etc.

 

[CBW]

Well I mean - Both stop cock and check valve are brand new. And I presume the check valve has moving parts and more likely to make sound. Plumber will be having a look anyway, I just wanted a little more information to arm myself incase he fobs me off with "they all do that".

Ahh right, assumed it was old since you said:

I've had my old stop cock repositioned.

With no mention of it being new

 

[WillyWarbux]

Any photo of the check valve??, make etc.

Sure, here's a photo. It looks to be basic Screwfix hardware.

 

[HERTS P&D]

Now tell me that is in the middle of your kitchen floor.



Andy

 

[WillyWarbux]

Now tell me that is in the middle of your kitchen floor.



Andy

haha it DOES look weird just now, but it should fit fine under a planned cabinet. fingers crossed

 

[CBW]

I’d still go back to your plumber/installer since it‘s a new install and a new ”fault”.