Fibre washer to tapered compression

[frank999]

I have a 90 deg isolation value with a fibre washer in one end.

Can you fit/mate the end of a tapered compression fitting (ie nut and olive removed) to this ??

Or should I be using brass hexagin nipple (that has a flat end) into the fibre washer end.

What is the difference between a Service Valve and an Isolation valve, the former contain fibre washers, the latter Olives.

Pics illustrate ...

 

[frank999]

What is the difference between a Service Valve and an Isolation valve

OK - seems a 'Service valve' is for connecting directly to an appliance, hence the Fibre end connects direct to that, are there adapters that will join Service Valve ends to compression.

Would this do the job ? or am I barking up the wrong tree with trying to join the two:

https://www.toolstation.com/brass-hexagon-nipple/p59604

 

[Jackrae]

Definitely not - guaranteed to leak
Fibre washers are designed to face seal against a mating flat face
A "service" valve is to permit 'servicing' and in my experience, may drip or pass slightly
An "isolation" valve is designed to isolate a supply and should never drip or pass
That said some manufacturers use both terms in the same descriptor
You can get service valves with compression fittings on both ends such as https://www.amazon.co.uk/Angled-Isolating-Compression-Degree-Chrome/dp/B011UB9SNM
And you can get flexible lines with 1/2" fittings each end such as https://www.ebay.co.uk/itm/1-2-x-1-...on-Adaptor-Connector-Flexi-Pipe-/221646895070

 

[Madrab]

Take a flat file and flatten down the edge of the compression end until there is a flat face. It's brass so it files really easily. The fibre washer will sit on that quite happily. I do it with flexi tap tails all the time so the edge of compression ISO's don't cut into the rubber washer. Just don't overtighten.

Img_2173

• Madrab
• 28 Oct 2019

ISO

It is a bit of a bodge though and you should really get the correct ISO valve, a service valve is for a direct connection to a valve or outlet, and ISO valve is more for an in line connection

 

[frank999]

Thanks for the good advice, yes aware that the tapered end of a compression fitting might cut the rubber in a flexi fitting (I'm trying to connect tap tails to 15mm copper, that comes out the wall at 90 deg, and avoid the flexi being too bent/curled).

OK ... so ended up replacing the 'service valve' with a compression 90 deg isolating valve:
https://www.toolstation.com/900-cp-isolating-valve/p82153

And bought these Flexi/Taps tails to mate with the rubber flexi end:
https://www.toolstation.com/tap-tail-adaptors/p14081