Diaphragm Cylinder
Diaphragm Cylinder
(OP)
We have some old details (from "before my time") that use (Norgren) Martonair diaphragm cylinders (also referred to as pot cylinders) to open a latch mechanism. To my knowledge, Norgren no longer makes these and so I am searching for a suitable replacement.
The cylinder I am looking for will have a short stroke (say 2 or 3 inch) with a spring return. A face/flange mounting arrangement would be best. I'm guessing that bore dia. would be around 3 or 4 inches (can't tell from the old details that were prepared on "hand CAD"). Compressed air at 90psig is the medium.
Can anyone point me to a suitable replacement? I have been googling for nearly two hours with no luck. I have also hunted through my catalogues for other cylinder manufacturers (Parker, Miller, Nopak), again with no luck.
Cheers,
CanuckMiner
The cylinder I am looking for will have a short stroke (say 2 or 3 inch) with a spring return. A face/flange mounting arrangement would be best. I'm guessing that bore dia. would be around 3 or 4 inches (can't tell from the old details that were prepared on "hand CAD"). Compressed air at 90psig is the medium.
Can anyone point me to a suitable replacement? I have been googling for nearly two hours with no luck. I have also hunted through my catalogues for other cylinder manufacturers (Parker, Miller, Nopak), again with no luck.
Cheers,
CanuckMiner





RE: Diaphragm Cylinder
Try a search on pneumatic valve operators.
RE: Diaphragm Cylinder
RE: Diaphragm Cylinder
RE: Diaphragm Cylinder
Regards,
RE: Diaphragm Cylinder
In addition to all of the normal cylinder suppliers listed, take a look a Firestone, Lord and Sumitomo who all make air springs. I think they also have rolling seal type cylinders that might be a suitable replacment.
RE: Diaphragm Cylinder
If you come across any other manufacturers who make a liquid-tight version, double- or single-acting, please post back here!
For what its worth, diaphragm air cylinders have a very low break-away and running friction loss compared to any other type of actuator. They also can be useful to prevent leakage of the driver fluid (wiping seals tend to "weep" a little fluid on every stroke), and are more capable of resisting wear due to environmental dust/debris contamination since the seal doesn't wipe. Hmm...that sounds bad the way it's worded.
RE: Diaphragm Cylinder
unclesyd, If I understand what you are suggesting, I'm not sure it would work. I need linear actuation, while the valve actuators I am familiar with are rotary actuators.
ruble3, I will hunt around at the link you provided.
quark, I am guessing at the bore size as it not specified on our old drawings. It may be much smaller. I will search these links as well.
MintJulep, It doesn't have to be a diaphragm actuator, but it would help if it fit into the same spatial envelope (or thereabouts).
In my office, we have a (good) habit of re-using old details, often in a rush without checking whether the components are still available (bad habit). What has happened in the past is that the contractor in the field (construction job)replaces these out of date items and doesn't tell us so that we here in the office naively copy the design yet again. While checking a drawing being prepared by my colleague, I came across one component I knew was out of date, so thought I would investigate the others. Little did I realize the jackpot that I would find with several components to update. :-(
Thanks again for your responses.
Cheers,
CanuckMiner
RE: Diaphragm Cylinder
http://www.bimba.com/products/products.htm
RE: Diaphragm Cylinder
RE: Diaphragm Cylinder
http://www.brake-eu.haldex.com/html/frameset.php3
you could also try Bendix and Wabco
Dave
RE: Diaphragm Cylinder
I am a machinist/design engineer...
Brent