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Quick-Exhaust Valve with muffler

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Quick-Exhaust Valve with muffler

Unread postAuthor: Eddbot » Sun Jun 01, 2008 12:44 pm

From McMaster in the quick exhaust valve section:

(G) Valves with Muffler— The muffler reduces noise made by the air as it exhausts. Valves are made of PBT (polybutylene terephthalate) plastic. Maximum pressure is 145 psi.


does anyone know if the muffler affects performance very much?

and this might sound like a noobish question, but on this QEV, is the third hole for the pilot on the end that isn't shown?

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Unread postAuthor: Lentamentalisk » Sun Jun 01, 2008 1:00 pm

I would think so, look at the diagram, there arrows show how it works.
Are the letters "P", "A", and "R"? on my QEV the ports are labled "IN", "EXH", and "CYL", so I am not sure
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Unread postAuthor: Biopyro » Sun Jun 01, 2008 1:18 pm

Looks to me like there is an arrow pointing to R, and some other arrow type thing towards P, so yes, the pilot will most likely be on the unseen face.

I doubt the muffler will make much difference to performance, in the same way as it has little effect in other applications. There's a good chance it just provides somewhere for the air to expand before it enters the atmosphere, so it might increase pilot volume a little but otherwise you should be fine.
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Unread postAuthor: POLAND_SPUD » Sun Jun 01, 2008 2:50 pm

for me the port that is not visible is the exhaust port (well that's based on that schematic... AFAIK you have no idea whetheher it is a built in muffler or not... if it can be remove that's ok.. but if it's not then you have a problem... mufflers for pneumatic equipment are different than suppresors for quns - they are to slow down the air not to let it expand
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Unread postAuthor: Biopyro » Sun Jun 01, 2008 3:04 pm

Surely if that was the case, it would honk awfully or just not be a quick exhaust valve!
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Unread postAuthor: POLAND_SPUD » Sun Jun 01, 2008 3:21 pm

EDIT
http://www.pbreview.com/products/search ... ev+muffler
not everything has to make sense :wink:
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Unread postAuthor: Hotwired » Sun Jun 01, 2008 4:17 pm

Mufflers are sintered bronze/stainless steel/plastic or wire, they don't give much expansion room at all. They seem mostly to be for disrupting the air blast of the QEV and doing so is likely to cause some resistance.

Since the exhaust is in fact your barrel I'd not really want to have a muffler in the way.
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Unread postAuthor: iknowmy3tables » Mon Jun 02, 2008 7:18 pm

agreed, as you know the normal purpose of a qev is to quickly exhaust sides of a air cylinder, the exhausting might be noisy so that would be the purpose of the muffler to damped the exhaust but in this case it dampens your firepower
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