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| Pneumatic burst valve - what's it's real name? |
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| loply:
Hi folks, Thanks for the useful replies. The kind I am looking for is the kind I have seen in the past. They are very simple non-moving parts, it is a screw-in thing that resembles a greese nipple, but it has a disc approx 3-5mm in diameter which is either copper or a tin-foil looking substance. I imagine they are about 50p each and I like the idea of them because, unlike some mechanical relief valves, I don't see how it could fail to work. I thought these things were as common as muck, but maybe I'm wrong. Having had a good look around all I can seem to find are mechanical valves. I'm sure these are pretty reliable but I would the type above! Just need to locate a supplier. Ultimately I guess it won't make a lot of difference though. Rich |
| David Jupp:
Will cost much more than 50p - They are critical safety devices, hence PED approved (in the EU), a surprising amount of technology goes into ensuring they always work at the right pressure. |
| John Rudd:
So let's just recap a little here...maybe we are over complicationg things.. You have a welded box, has the box been subject to any ndt to ensure it is safe to use as a pressure 'container'? So there is one safety feature if it is depending on what it is fabricated from of course.. Secondly you are supply compressed air from a compressor? So here we have a machine capable of reaching lets say for arguments sake 100 psi...if the pressure switch were to fail, then the backup is a relief valve...So potentially your box could reach a pressure which is essentially relying on an RV... If the liquid were to be discharged due to a loss of containment, what are consequences? This is the ultimate....unless there's somethnig I've missed... :Doh: |
| David Jupp:
If the box is totally filled with liquid, then the hazard due to stored energy is not great - if there is a head space of compressed air (say if air is used to drive the liquid out) then there is much more stored energy involved (to drive parts of the box towards you at high speed if things go wrong). You should also consider mal operation (e.g. could it be pressurised without any liquid inside?). I don't mean to be unduly alarmist... |
| fixerup:
Hi Rich, Nest time you are in a coffee supply shop, have a look at there stove top expresso coffee machine, they have a small over pressure nipple like you describe. Cheers! Phil |
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