DIY Self cutting tap kit

[CrazeUK]

Hey guys.
I have an outside tap kits with a self cutting tap kit. Its been installed for some years.

For a year it was fine and worked well.
But for some reason now water just trickles.

I find that as i turn the self cutting tap i hear the hiss of water passing through, it gets higher as i turn it, then suddenly shuts.

Could this be the copper "flap" it creates when doing the pearcing?
If so can i remove it to take the copper bit out and put the tap back on?

Here is the setup under the sink:


Does anyone know what this little screw does?



Thanks

 

[Charnwood]

Does anyone know what this little screw does?

Test point for an integral double check valve, possibly.

 

[Hugh Jaleak]

Horrible things, would say get rid of it, but it does contain the check valve which is a legal requirement. You'd need to remove the section of pipe, and push the piece of copper out from one end, highly unlikely it'll come out the hole it came from.

Personally, i'd remove it, fit a T, double check valve and then a washing machine tap, then fit the hose to tap onto that. Better job and you'll probably find better result from the end of the hosepipe!

 

[CrazeUK]

sorry for being a bit dim, am i right in thinking a double check valve is to stop the back flow of liquid?

I presume i need this because i shouldnt allow dirty fluid back into a fresh water system?

I did consider the T junction, with a washing machine tap.. but i know very little about plumbing.

I can use the plastic pipes and connectors easy enough.

 

[Charnwood]

am i right in thinking a double check valve is to stop the back flow of liquid?

I presume i need this because i shouldnt allow dirty fluid back into a fresh water system?

Correct. Most of these are fitted for outside taps by DIYers. Most professionals won't touch them.

 

[Agile]

I usually find that the cheap rubber sealing washer swells up after a few years and blocks to outlet!

Tony

 

[Hugh Jaleak]

If you're confident using plastic pipe and fittings then look at redoing the pipework with plastic to suit. Must ensure though the external pipework can be isolated (and drained) for winter conditions, and the aforementioned double check valve is a legal requirement.

Basically a checkvalve is required to prevent back siphonage into the water supply. Should for example, someone be using a hose to fill a fishpond, the hose becomes submerged in the pond water and then a fault occur in the supply network, contaminated water from the pond could be drawn back into the water supply. The check valve would prevent this.

 

[CrazeUK]

Hey guys thanks for your help and explanations.

So i embarked on the correction work.
I couldnt find my pipe cutter, so bought an adjustable clamp style (i know they are not great but i am an occaisional DIYer lol).

I took of the piece of pipe where the Self Cutting tap was fitted, which happened to have a one way valve on it (i presume double check).

I cut off the whole and placed the new washing machine T Fitting like this one:

, On first go it leaked (didnt tighten the bolts enough).

Afterwards it worked a treat.
Jobs a good un and my trickle is now full flow.

Here is my dirty work:

 

[RickMoore]

Where has the check valve gone ?

 

[Agile]

A double check valve is only required to make it compliant with the Water Regulations!

DIYers don't bother to comply!

 

[kbdiy]

Wall plate elbow and bib tap surely?

 

[Charnwood]

Wall plate elbow and bib tap surely?

 

[CrazeUK]

Hey guys.
Sorry i dont get notifications from the site about my threads..

Where has the check valve gone ?

Isnt the thing on the right (of the new tap) of it the double check valve?

Wall plate elbow and bib tap surely?

I am a bit lost????

A double check valve is only required to make it compliant with the Water Regulations!

DIYers don't bother to comply!

Is that true, or sarcasm lol? Have i broken regs? if so i would rather not.



-----------------------------------

 

[denso13]

Isnt the thing on the right (of the new tap) of it the double check valve?

No, that's just an isolation valve.

 

[Charnwood]

Have i broken regs?

Yes.

i would rather not

Then you need to fit a double check valve.