Isolator Valves on Pushfit Pipe

Hi all
About to start plumbing up kitchen island - we have plastic pipe as the main feeds under the screed

I have taps and a dishwasher to feed into - just wondering if there is a preference for compression isolators (using the plastic inserts in the pipe) or should just get the JG isolators as it looks a touch quicker

Also do I need any sort of check valve to stop dirty water coming back into to the main supply (if it can that is)

Thanks all

 

Just the thoughts of a diy'er but as you've not had any other responses, I'll tell you as much as I know on the subject ! I can't say though whether to go with plastic as I've never worked with it.

The majority of flexi tap connectors, isolator valves and supplied tap tails will all reduce the internal pipe diameter considerably. So any 15mm compatible fitting will have an internal measurement of maybe 8-10 mm (I'm guessing here a bit, but reduced definitely)

If this is enough to make a significant reduction though, I cant answer that

If your concerned though, why not fit a "full bore" valve as means of isolation. As a side note, I'm having problems with my mains cold water pipes disturbing me at night when someone runs the kitchen tap and I can't help but wonder whether it's because I didn't fit full bore iso valves

An example of full bore:

http://www.screwfix.com/p/15mm-full-bore-isolating-valve/46860

If you decide to use, ensure that you use inserts in your plastic pipe (same make inserts as pipe).

Sounds like you've answered your own question Yes, I'd always fit a single check valve before either a washing machine or dish washer. In view of today's byelaws, I would assume it is now required (could be wrong however). You may already know you can get 3/4" washing machine/ dish washer isolators with built in check valve. However, I don't know whether you'd need a straight or elbow but from experience, I could never find an elbow with built in check valve, only straight.

 

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Please select a service and enter a location to continue...

Plumber / Gas Engineer Electrician Builder Decorator Builders' Merchant Plumbers' Merchant Tile Supplier Flooring Supplier
Start Search

Are you a trade or supplier? You can create your listing free at DIYnot Local