stop tap in reverse.

[PrenticeBoyofDerry]

If a stop tap was installed in reverse to the directional arrow,
what would happen?

 

[doitall]

You may not get any water out the end.

 

[Burnerman]

There's a pretty good chance you wouldn't notice anything at all, but there could be a chance that the tap jumper would start to vibrate if the tap was just cracked open. Also, the water pressure could move the jumper and keep it pressed against the seat, so preventing the stopcock from opening.
With conventional fixing, the jumper is forced down against the direction of the water flow so once the washer is firmly on its seat, it stays that way.
John

 

[seco services]

Last time i done that mistake i got no water flow.

 

[PrenticeBoyofDerry]

So if installed in reverse with the design of the body valve, the water pressure is not going to allow the jumper and washer to clear the seat, so no water

 

[Dan Robinson]

Yup.

 

[doitall]

Thats what I said.

 

[Dan Robinson]

eh?

 

[doitall]

You may not get any water out the end.

That clearer Dan.

 

[Dan Robinson]

What?

 

[Justin Passing]

Stopcocks since about BS 1010/2 1973 have had to have pinned jumpers so they don't act as one way valves - unless they aren't working properly.
Older ones were not pinned so they will stop the water coming out - unless they aren't working properly.

So it's anyone's guess.

 

[HERTS P&D]

Just fit a full flow lever valve, easy to turn off in an emergency and easy for the older generation to turn off and understand how to turn off.

Andy

 

[Nige F]

Just fit a full flow lever valve, easy to turn off in an emergency and easy for the older generation to turn off and understand how to turn off.

Andy

and no arrow on the side - to confuse

 

[doitall]

Talking of Arrows, any one want to guess what the arrow on the cheap isolating valves denotes.

 

[Charnwood]

This way up.
Beware of the Indians.
Not to be fitted by cowboys or the Indians will shoot you with their arrows.