[Sam J.]

Yes, using a dubble solenoid valve will keep it's poition after the power has been cut at the end of the match. However, the pressure regulators relieve excess air pressure in the system. On page 4 of the penumatics manual, It describes this process as:

"Assume that you extend the cylinder of the apparatus the cylinder is attached to agaainst a wall. Then push against the wall with your robot. That would increase the preasure in the cylinder. The increased pressure will relieve out of the regulator and the cylinder will slowly retract."

Now, immagine your robot as a weight the the cylinder has either extended or retracted, which will cause a greater preassure than 60psi (if your robot weight under the cylinder is greatter than 45 pounds) on a 3/4" bore cylinder or if the robot is greater than 90 pounds under the cylinder on a 1.5" bore. In order for you to get around this problem, use a 2" bore with a robot weight under 120 pounds.