Discuss Full bore isolating valves- which way round to fit? in the Plumbing Jobs | The Job-board area at PlumbersForums.net
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theres an arrow on them but normally the small / split outlet
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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.
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.
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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.
They don't call them suicide valves for nothing.
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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.
I think most manufacturers add a flow direction arrow because it does matter with some other valve types and people expect to see them.
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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.
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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.
I do generally find it’s the no brand crap that leak.
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What about full bore lever valves, which way should the handle point?
In line with supply or feed?
In line with supply or feed?
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