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Unread 26-03-2011, 23:36
Roboman01 Roboman01 is offline
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AKA: Bradley Matheus
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Re: Solution: Variable position of cylinder in compliance with <R74>

Quote:
Originally Posted by PAR_WIG1350 View Post
If it is trapped, any change in volume can lead to pressurization (that's why we aren't allowed to block the ports on cylinders to make gas shocks). I don't know if this affects you, but if it does, it could be important to know.
Thanks for the heads-up, but it doesn't really affect us. The push-button valves are just in case we need to move the arm, since it would generate a vacuum in one side of the cylinder. The check valves will allow any built up pressure to equalize with the atmosphere, but they will not allow air in. I tested the arm with a pressure gauge in each cylinder supply line, and the vent valve dumped all pressure when opened. Under load, the vacuum usually isn't enough to hold the arm up on its own, but it does make manual repositioning slightly more difficult.