[PSUBS-MAILIST] Pneumatic Rotary Actuators

[Alan James]

Hi, 
I'm wondering if anyone has had any experience with either pneumatic
rack & pinion actuators, or rotary vane actuators, operating underwater.
I need to rotate something through 180 degrees & have it held with a bit
of clamping pressure at one end of the motion.
One concern is seawater getting in to the gearing of those items, & there reliability. 
Another option, could be a normal pneumatic cylinder with an external
rack & pinion added. Am trying not to have to go to hydraulics.
Alan
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