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Originally Posted by Chris Fultz
This is still an excellent series of posts and the schematic described here will work. BUT, if the system is not properly controlled, part of the pneumatic system is operating above 60 psi if your system regulator is set at 60 psi.
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Chris is correct here and I hope everyone read his post. It is my opinion that any team which is using this (really cool) way of multi-positioning cylinders should have the "actuation" pressure limited to 54 PSI. This ensures that the system is not DESIGNED to operate with pressures within a cylinder greater than 60 PSI.
Yes, sometimes cylinders may get "overpressurized" by some external force (another robot, wall etc.) but your pneumatics system should not be designed to take advantage of this. (In the same way you would not use a motor to compress air in a large cylinder and use it to pneumatically power a smaller cylinder at higher pressures than 60 PSI.)
Note that if you have 66 PSI in a line in your system at some point, you could USE that higher pressure by connecting another valve and another cylinder... I think we would all agree this is not legal.
So I think that we need to take precaution and design systems which never have actuation pressures (within a cylinder) greater than 60 PSI. And has already been pointed out, be sure that you include the LOAD on the cylinder as well.
-Mr. Van
Coach, 599