stopcock "arrow" indicator
sm_jamieson
be fitted with the water running one way, and when the new kitchen is
finished the water will run the other way.
The stopcock has an arrow embossed on the side. I assume this is for
indication only - I've never heard of a one-direction stop cock - its
just a "tap". (I know some service valves are supposedly on way).
Or am I wrong and the stop cock should be fitted in a particular
direction ?
Simon.
Robin
ISTR being told that if a stopcock is fitted with the flow reversed
then the water pressure might push the jumper into the seating and so
stop water flowing. That may have been from the same school as the
instruction to fetch a left-handed mug and a dozen round tuits but it
was also explained as being in the nature of a sort of isolating valve
to limit flow back into the "mains".
--
Robin
PM may be sent to rbw0{at}hotmail{dot}com
Mr Pounder
"Robin" <s...@sig.sep> wrote in message
news:rtbdp.118328$up7....@newsfe04.ams2...
Mr Pounder
"sm_jamieson" <sm_ja...@hotmail.com> wrote in message
news:2b32a5a1-f998-427c...@k38g2000vbn.googlegroups.com...
Arrow should be in the direction of the flow / supply.
Mr Pounder
>
jgharston
> The stopcock has an arrow embossed on the side. I assume this is for
> indication only
yes, to indicate the direction it must be fitted in.
> I've never heard of a one-direction stop cock - its
> just a "tap".
Yes, and as with all "just taps", they are asymetrical, they must be
fitted in the direction of the flow. Look inside the tap. You will
see that the inner pipework goes from the "in" end, bends through
90 degrees up towards the handle where the flow is stopped by the
handle screwing a plunger /down/ onto the incoming flow. Essentially,
this shape:
--+--
|
+|-----,
||+---, \
|+| \ \
/ \ \ \
---+ | \ '---
-----+ ---> '----
Like this: http://cairnscorp.com/images/SolutionCouncil.jpg
but with the outflow horizontal.
JGH
jgharston
JGH
sm_jamieson
Hum. I've never thought about it before.
So, I guess I need a bi-directional full-bore service valve.
Simon.
jgharston
If it's for isolation (or low pressure, eg, from storage tank),
yes. A gate valve would also do (that's one where a gate descends
across the flow of water to stop it - peer down the pipe as you
operate it to see what happens).
If it's a supply feed, no, you need a stop tap.
JGH
sm_jamieson
It is to isolate some pipework that may be used at some point in the
future (to avoid a long
dead leg of stagnant water).
Also, if I get a new water supply to the house, this section of pipe
will have the
water flowing the other way. It needs to shut off the water
completely, which a gate
valve does not do.
By "supply feed" do you mean the main isolation for the water supply
to the house ?
Yes, a stopcock is required for this of course.
I'll get something like this:
http://www.screwfix.com/prods/80413/Plumbing/Brassware/Full-Bore-Lever-Ball-Valve-15mm
Now, these usually have an arrow on too ! However as far as I am aware
the thing is symmetrical,
and the is only for indication purposes (despite what I may have said
earlier).
Am I correct on this ?
Thanks,
Simon.
Skipweasel
@w36g2000vbi.googlegroups.com>, sm_ja...@hotmail.com says...
> I'll get something like this:
> http://www.screwfix.com/prods/80413/Plumbing/Brassware/Full-Bore-Lever-Ball-Valve-15mm
>
> Now, these usually have an arrow on too ! However as far as I am aware
> the thing is symmetrical,
> and the is only for indication purposes (despite what I may have said
> earlier).
> Am I correct on this ?
>
No. The ball can be lifted off its polymer seat by the water pressure if
fitted backwards. Though there is a seat the other side, it's not as
"fixed" being held in by a retaining clip.
A house I recently worked on had the kitchen floor ruined by a weeping
service valve which had been fitted backwards.
--
Skipweasel - never knowingly understood.
sm_jamieson
wrote:
> In article <77593365-52ab-4f2e-b7e6-b9978d83d4d5
> @w36g2000vbi.googlegroups.com>, sm_jamie...@hotmail.com says...
>
> > I'll get something like this:
>
> > Now, these usually have an arrow on too ! However as far as I am aware
> > the thing is symmetrical,
> > and the is only for indication purposes (despite what I may have said
> > earlier).
> > Am I correct on this ?
>
> No. The ball can be lifted off its polymer seat by the water pressure if
> fitted backwards. Though there is a seat the other side, it's not as
> "fixed" being held in by a retaining clip.
>
> A house I recently worked on had the kitchen floor ruined by a weeping
> service valve which had been fitted backwards.
>
So is there any reversible valve that I can use ?
Simon.
Frank Erskine
Probably a gate valve.
--
Frank Erskine
chris French
<dcd6b371-0f81-409e...@p16g2000vbo.googlegroups.com>,
sm_jamieson <sm_ja...@hotmail.com> writes
wouldn't be that hard.
--
Chris French
sm_jamieson
wrote:
Simon.
sm_jamieson
wrote:
> In message
> <dcd6b371-0f81-409e-8bc4-ff17f0d55...@p16g2000vbo.googlegroups.com>,
> sm_jamieson <sm_jamie...@hotmail.com> writes
How about 2 ball valves back to back ?
As long as the one that the water reaches first is used to switch off
you would be OK.
Oh, and make sure the other valve is fully on all the time. Hopefully
the small restriction
caused by the open valve would not be enough to mess with the seal.
Simon.
Skipweasel
0...@familyfrench.co.uk says...
> >So is there any reversible valve that I can use ?
> >
> As long as it's accessible enough swopping it round in the future
> wouldn't be that hard.
>
Or two, back-to-back.
Skipweasel
@p3g2000vbv.googlegroups.com>, sm_ja...@hotmail.com says...
> How about 2 ball valves back to back ?
>
TapRays!
sm_jamieson
> In article <5aa3a4d5-196c-43b0-b24a-44f320fb73f6
>
> > How about 2 ball valves back to back ?
>
> TapRays!
>
And a big sign saying "to any operators of these valves, here are the
vital
instruc ... (big bit of burnt wood where some soldering has obviously
occurred)
Simon.
Tim Lamb
<newspos...@familyfrench.co.uk> writes
What about just clamping the pipe?
2 weeks in Madeira have left me with a rather casual attitude to closing
off plastic water pipes.
Technique 1..... fold end of pipe back on itself and secure with cable
tie.
2.... weld end closed with blow lamp or cigarette
lighter etc.
regards
>
--
Tim Lamb
PeterC
Last year I had to ask on here as the full-bore valve didn't have an arrow.
If there is a correct way, it should be indicated; no indication implies
that it doesn't matter but sometimes it does.
--
Peter.
The gods will stay away
whilst religions hold sway
sm_jamieson
> On Mon, 7 Mar 2011 22:15:52 -0000, Skipweasel wrote:
> > In article <77593365-52ab-4f2e-b7e6-b9978d83d4d5
> >> I'll get something like this:
>
> >> Now, these usually have an arrow on too ! However as far as I am aware
> >> the thing is symmetrical,
> >> and the is only for indication purposes (despite what I may have said
> >> earlier).
> >> Am I correct on this ?
>
> > No. The ball can be lifted off its polymer seat by the water pressure if
> > fitted backwards. Though there is a seat the other side, it's not as
> > "fixed" being held in by a retaining clip.
>
> > A house I recently worked on had the kitchen floor ruined by a weeping
> > service valve which had been fitted backwards.
>
> Last year I had to ask on here as the full-bore valve didn't have an arrow.
> If there is a correct way, it should be indicated; no indication implies
> that it doesn't matter but sometimes it does.
> --
I've been trying to squint at picture of the full bore gas ones. I
wondered if those are bidirectional as they don't appear to have an
arrow on, but the picture could be poor.
I also found:
http://www.javelinirrigation.co.uk/html/Turf_Products/turf_products/valves.htm
Simon.
sm_jamieson
>
> Simon.
Do those MDPE inline stop taps have arrows on ?
Simon.
Tim Watts
13:22:
I was wondering - I have some flow-restrictor full bore valves from BES that
did not have an arrow. I took a guess.
--
Tim Watts
PeterC
Sorry, I can't remember - I thought that I'd kept that somewhere.
They appear to be symmetrical re. seats, i.e. no circlip. One side has a
hexagon socket inside which, together with the hexagon on the body, is the
method of assembly, so I'd tend to make that the inlet - the other end has a
little less of the seat showing inside the body.
If there were a circlip I'd do as already suggested and have the force away
from that (have I got this right?).
As mine was for a loop between 2 radiators it wasn't a critical use re.
pressure.
sm_jamieson
>
> > Simon.
>
> Sorry, I can't remember - I thought that I'd kept that somewhere.
> They appear to be symmetrical re. seats, i.e. no circlip. One side has a
> hexagon socket inside which, together with the hexagon on the body, is the
> method of assembly, so I'd tend to make that the inlet - the other end has a
> little less of the seat showing inside the body.
> If there were a circlip I'd do as already suggested and have the force away
> from that (have I got this right?).
> As mine was for a loop between 2 radiators it wasn't a critical use re.
> pressure.
> --
> Peter.
> The gods will stay away
> whilst religions hold sway
I've just got a full bore lever valve from B&Q with own brand "Plumb
SURE".
One end has a hexagon as you say - method of assembly.
No arrow, nothing about direction on package.
Looking in both ends it appears identical. No circlip. Just housing,
nylon surround and the ball.
I cannot see how it could possibly matter which direction its fitted.
And of course being full bore, there is no force of water rammed into
the ball / surround interface.
Simon.
sm_jamieson
Ah now I've just looked at a normal service valve. It is a single
casting, not assembled like
the full bore valve. And obviously has been put together by pushing a
circlip in. And the flow
is marked as into the circlip end.
So I would suggest:
The circlips ones are directional, the 2-part assembled ones (with a
hexagon for assembly) are not.
Anyone disagree ?
Simon.
m...@privacy.net
sm_jamieson <sm_ja...@hotmail.com> wrote:
> And of course being full bore, there is no force of water rammed into
> the ball / surround interface.
Until it's turned off.
I've often wondered which way round to put isolating valves on the flow and
return to part of a radiator circuit. Part of mine[*] is prior to the zone
valves, and needs isolation in the summer when hot water only is needed. In
this case having the one in the return with the arrow opposite the normal
flow seems best, but the order of turning them off may matter. I've had one
or two leaks ther with cheap valves. Currently one has been replaced by a
gate valve.
Full bore ones are often of better construction standards. I may use them
next if I get any more problems on these two radiators.
[*] Close to the boiler in the garage. The zone valves are in the airing
cupboard, some distance away.
--
B Thumbs
Change lycos to yahoo to reply
PeterC
>> I've just got a full bore lever valve from B&Q with own brand "Plumb
>> SURE".
>> One end has a hexagon as you say - method of assembly.
>> No arrow, nothing about direction on package.
>> Looking in both ends it appears identical. No circlip. Just housing,
>> nylon surround and the ball.
>> I cannot see how it could possibly matter which direction its fitted.
>> And of course being full bore, there is no force of water rammed into
>> the ball / surround interface.
>> Simon.
>
> Ah now I've just looked at a normal service valve. It is a single
> casting, not assembled like
> the full bore valve. And obviously has been put together by pushing a
> circlip in. And the flow
> is marked as into the circlip end.
>
> So I would suggest:
> The circlips ones are directional, the 2-part assembled ones (with a
> hexagon for assembly) are not.
> Anyone disagree ?
>
> Simon.
That seems reasonable. My only reason for having the hexagon (socket) end
upstream is because there's a tiny bit less seat showing on the other end
but I doubt if it matters.
I do have 2 of these valves but the other one has fitting on it so I can't
see if the slight difference is consistent or just normal manufacturing
variation.