Always thought it was the direction of flow so that crud didn't get into the circlip section and joint of the two halves - if that makes sense.
stop tap in reverse.
- Thread starter PrenticeBoyofDerry
- Start date
Always thought it was the direction of flow so that crud didn't get into the circlip section and joint of the two halves - if that makes sense.
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Direction of flow so you don't blow the circlip/ball out.
Close Seco but not quite right.
The arrow points to the end that can safely be disconnected if the pipework is under pressure, otherwise you could turn the valve off undo the nut and the ball will fly out.
But if the valve is put in reverse, your still getting wet!
As you will be removing the end that is not closed/isolated!
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Assume you have a length of pipe with an isolating valve in the middle.
You want to work on the pipe so you turn the valve off and intend to drain the end you want to work on.
But the arrow is pointing to the opposite end, therefore if yo drain the section you want to work on, leaving the other end under pressure, the little ball will fly out.
You want to work on the pipe so you turn the valve off and intend to drain the end you want to work on.
But the arrow is pointing to the opposite end, therefore if yo drain the section you want to work on, leaving the other end under pressure, the little ball will fly out.
Just swap it back to the correct way..... simples 
Just swap it back to the correct way..... simples
Bit late for that if the ball has flown the nest and water is peeing everywhere.
Yes the direction of flow arrows does help to indicate which side would be safe to open after isolation but also, if you look inside the service valve one end has a strange shaped partially coned perforated metal disc(best I can describe it sorry) which apparently has something to do with water hammer....if the ISO is shut while water is flowing is softens the back pressure not 100% sure, researched it when I was an apprentice and keen as mustard!
We do cheap imported Chinese, reasonably priced Italian and ridiculously priced real McCoy Ballofix isolating/service valves. None of them has anything like what you describe.
Sounds more like an in-line filter. Doubtfull if that would have any effect on water hammer, although it would affect the flow rate.
I'll upload some pictures tonight its not a filter, if I couldn't tell the difference between an in-line filter and whatever this is I shouldn't be doing plumbing, 4years of college wasted.lol.
But if you are wanting to work on this length of pipe with service valve in the middle. And you don't know the direction of flow, you would isolate it then disconnect the nut the arrow is pointing to, would you not? thus getting wet, but no blow out! If you disconnected the other end "your a crazy fool"
Hmm, you'd be surprised st some of the questions we get asked by supposedly qualified plumbers, heating engineers and mech services engineers!!
I see what you are referring to in your pictures.
It's a sprung ring. It will be pushed in so that it slots in behind a ridge or into a groove to hold the ball in place.
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