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valves
A valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fittings, but are usually discussed as a separate category. In an open valve, fluid flows in a direction from higher pressure to lower pressure. The word is derived from the Latin valva, the moving part of a door, in turn from volvere, to turn, roll.
The simplest, and very ancient, valve is simply a freely hinged flap which swings down to obstruct fluid (gas or liquid) flow in one direction, but is pushed up by the flow itself when the flow is moving in the opposite direction. This is called a check valve, as it prevents or "checks" the flow in one direction. Modern control valves may regulate pressure or flow downstream and operate on sophisticated automation systems.
Valves have many uses, including controlling water for irrigation, industrial uses for controlling processes, residential uses such as on/off and pressure control to dish and clothes washers and taps in the home. Even aerosol spray cans have a tiny valve built in. Valves are also used in the military and transport sectors. In HVAC ductwork and other near-atmospheric air flows, valves are instead called dampers. In compressed air systems, however, valves are used with the most common type being ball valves.
Hi - I'm not sure what these things in the picture are called, but water flows to each room when the "float" moves down, but one is stuck.
Last year a heating engineer came and unstuck the valve by tapping on it with his screwdriver head.
I've tried that, but no luck - three of the floats move...
Hi all, my towel rail is only half heating up and I'm guessing it needs bleeding, thing is it hasn't got your usual bleed valves installed, so how do I go about bleeding this rail? Hmm it won't let me add pics??.
Basically its a flat head screwdriver kind of valve head, I've tried searching on...
This may be a silly question, but limitless googling has got me nowhere. Is is possible to source a Y/T valve with two separate channels (so four inputs, two outputs, where say in position 1 the first input connects to the first output and the second input connects to the second output, then in...
Hi guys, long time lurker, infrequent poster...
I have a rad in my bathroom with a TRV, simple enough so far...
The pin on the trv has seized.
I have tapped, sprayed wd40, tapped again, sprayed, twisted, pulled, tapped, sprayed... And the pin just wont open,so ive come to the conclusion its...
I've bought a new chrome towel radiator as the old one is all rusty.
I also bought new angled (standard) valves, 1/2" X 15mm as they too are old and rusty.
But when I look at what comes out of the wall, it's clearly not 15mm pipe, looks more like 10mm (plastic).
How have they gone from 15mm...
I have 10 radiators with smart TRVs fitted to angled radiator valves - some of these valves are weeping around the plunger shaft - the valves were fitted in 2012 and 8 years seems a short life (I suspect they were cheap!), so I want to replace all 10 valves with better quality valves - but need...
Morning all. I hope you are all well. I have come across a one pipe system which basically isn't working. Client says it has never worked great but it has become a lot worse. I see the radiators that have been added later on have valves on both ends of the rad which I hear is a no no. I also...
Hi what is the purpose of isolation valves on pipes? All of my tap pipes have isolation valves and should they be fully turned for the water pressure?
Thanks
I,m about to change from plastic fitting to copper and want to add a check valve into my secondary hot water return line what prevents the hot water sucking the water out of the secondary return line the plumber that fitted it is no longer here so I cant ask why a check valve wasnt installed...
I have now had both my Danfoss HPA02 valves fail (hot water and central heating on an S plan). It is easy enough to replace the heads, but the failure mode in both cases has been the micro switch failing to open once the call for heat was removed.
With the heating, we were away and came back to...
Hello everyone.
This is a general question, so not linked to any jobs Iv done or 1 particular scenario.
The question is would you advise fitting isolation valves on the hot, cold, gas pipes of a new boiler install? Just asking as Iv not seen any boiler installs with isolation valves on these...
Hi all, I'm planning on fitting my new sink which has a mixer tap. I'm using an unvented system, will this still require non-return valves fitted to the taps connections?
Anyone use these
ive used the silver with red handles before and they seemed ok but a tad on the expensive side around £22
they look An ok brand as I’ve seen the logo before maybe flowflex etc
Having a straight bath fitted and going for taps to the bath and an Aqalisa shower above. So the hot/cold pipes that supply the bath taps will they be different to the ones that supply the shower?
I mean do I need separate pipes to the shower with their own valves or can the pipes that will...
Wanted; 2 zone valves, 1 midpoint valve, 1 3 port diverted and wiring centre - Used or Faulty
Hi, I'm after the above so that I can a mock CH/HW setup to add to my electrical play rig (see link)
I'm usually found on EF but figured here would be the more suitable place to ask if anyone has any...
So did a job for a friend yesterday and made (i hope) a small muckup....
Installed a unvented heatrae sadia multipoint 15 but i used plumbers paste on all my compression elbows about 10 of them i only put it on the male threads.
The instructions state that it should not be used as it may...
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