|
|
Post by rocketmanbkk on May 6, 2017 17:54:27 GMT
The hot tank, vented, the feed from the cold above has a valve on it.
If you turn this valve off will it stem hot supply to taps?
Also if cold are tank fed same scenario.
Lastly, should hot feed from tank have a valve on it?
Cheers all
|
|
|
|
Post by Plumberboy on May 6, 2017 18:52:58 GMT
You normally have gate valves on the cold from the tank which goes to the cold taps and the pipe that feeds the cylinder, turn them off and that stops your flow,,,,you can have a valve on the feed from the cylinder providing it is after the vent mate.
|
|
|
|
Post by tomplum on May 6, 2017 18:55:52 GMT
the cold feed from the cold tank to the cylinder should have a valve on it, a gate valve, if you shut it , it will stop the hot taps working ( if its not siezed), If the cold taps are shower is fed from the cold tank, they will or should have seperate feeds with valves on,
the hot feed pipe should not have valves on as this will stop any expansion and cause a danger,
|
|
|
|
Post by tomplum on May 6, 2017 18:57:56 GMT
PB beat me, but we have the same info but varied,  |
|
|
|
Post by rocketmanbkk on May 6, 2017 19:14:49 GMT
Thx
It's what I thought but needed to know 100%
Thx again
|
|
|
|
Post by endfeed on May 6, 2017 19:32:40 GMT
Ive stop touching the gate valves to swich hot water off, they've either snapped (keep turning) jammed up, swiched one off in a care home and the fooker snapped when trying to turn it back  on. Use my bungs these days |
|
|
|
Post by rocketmanbkk on May 6, 2017 19:35:21 GMT
Yeah, I bunged today, all ok. Just put ballofix on & water back on.
|
|
|
|
Post by crowsfoot on May 6, 2017 21:36:20 GMT
The hot tank, vented, the feed from the cold above has a valve on it. If you turn this valve off will it stem hot supply to taps? Also if cold are tank fed same scenario. Lastly, should hot feed from tank have a valve on it? Cheers all In the 80s their was a craze to fit them on the H/W distribution pipe downstream of the tee (not before). It didn't last long but maybe you got a better shut off in that position rather than on the cold feed. |
|
|
|
Post by Plumberboy on May 7, 2017 9:20:16 GMT
The hot tank, vented, the feed from the cold above has a valve on it. If you turn this valve off will it stem hot supply to taps? Also if cold are tank fed same scenario. Lastly, should hot feed from tank have a valve on it? Cheers all In the 80s their was a craze to fit them on the H/W distribution pipe downstream of the tee (not before). It didn't last long but maybe you got a better shut off in that position rather than on the cold feed. That's right tappy it was to stop the remaining water being pulled out and air in through the vent pipe causing air locks on the hot side. |
|
|
|
Post by endfeed on May 7, 2017 9:37:13 GMT
Hi p.b, so when the hot is switched back on is that when the air can draw in? Is that what your saying mate . |
|
|
|
Post by Plumberboy on May 7, 2017 11:04:54 GMT
Hi p.b, so when the hot is switched back on is that when the air can draw in? Is that what your saying mate . Hi endfeed,,, when the gate valve is on the feed to the cylinder and you turn it off you then open the hot tap, the water runs out emptying the whole pipework right back to the cylinder including the vent pipe which is where the air gets pulled in (its an open straw). When you switch the water on you can get bad airlocks on some systems. If you have a gate valve downstream past the tee for the open vent and shut that off and open the hot tap only a dribble will run out (closed off draw at the top end) air can't get in so water can't run out but the cylinder is still vented. This was never really deemed good practice as it is preferred to be fully vented pipe runs but you will come across it at times. |
|
|
|
Post by Plumberboy on May 7, 2017 11:29:50 GMT
Tom may do a diagram to explain it better.
|
|
on. Use my bungs these days 