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Oil Filled Gauge or Pressure Subber?

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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Oil Filled Gauge or Pressure Subber?

Unread postAuthor: garybdavis » Sun Nov 11, 2012 10:03 pm

The pressure gauge mounted on my pressure chamber will go from full pressure to zero rather rapidly when the cannon is fired. I wonder if this will be hard on the gauge and cause it to fail prematurely.

I've used oil filled gauges in applications where I had engine vibrations but not pressure snubbers which would seem to be useful in this application.

Does anyone have any experience with gauges failing due to the rapid drop of pressure and should I get an oil filled gauge or pressure snubber?
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Unread postAuthor: ramses » Mon Nov 12, 2012 12:37 am

I feel like it should be fine. If you're worried, you could put a restrictor in the tube to the gauge. This could be as simple as filling a short section of tube with epoxy, poking a needle through, and letting it cure.

A small needle valve would also work.
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It can damage gauges

Unread postAuthor: Technician1002 » Mon Nov 12, 2012 1:03 am

High speed decompression can damage gauges. My 2 inch QDV is on it's second gauge. The pointer tends to slip on the shaft and no longer properly read zero. I need to add a restriction to my cannon to save gauges. I am considering simply threading the inside of the gauge stem and screwing in a setscrew so leakage will snub the flow.
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Unread postAuthor: Crna Legija » Mon Nov 12, 2012 3:07 am

I have a 0-1000 psi oil filled gauge on my fridge compressor that decomp quick when you disconnection it from the rifle, it has faired quite well, easy 1000 fill not issue.
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