Full bore isolating valves- which way round to fit?

[Andy B]

Hello chaps,

Just fitting some full bore isolating valves. No arrows on the casing for water flow direction.

The screwed joint is one side of the ball valve.

Is there any preference with which way to fit them ? Does it matter?

Cheers

 

[ShaunCorbs]

theres an arrow on them but normally the small / split outlet

 

[chris watkins]

If no arrow then shouldn't matter Andy but personally I would install with flow running from left to right in your photo.

I seem to remember when they first came out the joint between the two halves of the valve was alway to be on the upstream side.

 

[Andy B]

Thanks for the info chaps,

I wonder what the reasoning is??

I fitted them the opposite way around- my idea was there was one less joint to leak on the pressure side.

I might swap them later.

Cheers

 

[chris watkins]

I wouldn't worry I have never had a problem with that leaking, it is always around the stem.
They don't call them suicide valves for nothing.

 

[OffshoreGas]

Mechanically they are symmetrical so it shouldn’t really matter.

I think most manufacturers add a flow direction arrow because it does matter with some other valve types and people expect to see them.

 

[Darren Jackson]

I'd go for the lever type rather than the screwdriver one in the picture far less trouble in the future. And if no arrow then it does not matter which way round it is fitted.

 

[ballvalve]

I would not use that type of valve they will leak, use the 1/4 turn far better.

 

[OffshoreGas]

It’s a shame they don’t fit a gland but to the valve stem you could nip up to stop leaks. Great cavaliers otherwise.

I do generally find it’s the no brand crap that leak.

 

[Jim Goodenough]

What about full bore lever valves, which way should the handle point?
In line with supply or feed?

 

[OffshoreGas]

Really doesn’t matter, just make sure you can open/close without obstruction.

 

[ShaunCorbs]

Left side in pic supply

 

[FG28]

What about full bore lever valves, which way should the handle point?
In line with supply or feed?
View attachment 38540

Fall to off i usually go for

 

[Dw911]

If no arrow, id always fit them with the solid inside face on the feed side, the solid machined side when you look inside the valve if that makes sense
Why, a fellow plumber disconnected the feed side of one of these in some flats, temporarily, as it wasn't letting by he for whatever reason didn't bother to cap it and went home, during the night the ball part blew out of the open end of the valve, the valve had no arrows, but if the valve had been oriented the other way it wouldn't have been able to happen

 

[Brambles]

DW911 -absolutely spot on