Quote:
Originally Posted by wilsonmw04
That sentence would make the system illegal. Any one valve would have to remove ALL pressure from the system. We had two on our robot last year (because we forgot to take one off while testing part of it) and the inspector made sure that we didn't have any pressure behind it when the main valve was released.
Again, any air trapped when any one valve is opened will cause your robot to fail inspection. Ignore our multiple warnings at your own risk.
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Trapped air that is not pressurized beyond atmospheric pressure is legal, to my knowledge. The only thing that is making the arm difficult to move is the vacuum generated inside the cylinder, since the check valves prevent air from entering the system. The extra push buttons let air into the cylinder. Vacuums are not subject to the rules governing pneumatic systems, according to <R66>, part G. Once the vent plug valve is open, any positive pressure created by the movement of the arm is exhausted as it is created, through the check valves, and the only pressure that exists is negative (vacuum).