[Danielle H]

If you're using a double ended solenoid, then you're going to want two seperate relays (one attached to each end) so that you can activate one after the other is deactivated. This will push the piston in the opposite direction.

But, if you only want to use one relay, then you can use a single-ended solenoid valve like the one given in the KOP (Part # 13026684... Or if you're looking at the pdf file of the list, it's on the bottom of the 13th page.. I've got it up right now.) The single-ended solenoid has a spring-return so that when you deactivate the relay, the solenoid and the piston will automatically return to its original position.

That's really all I can do. (I already had to ask the head engineer of our team to help me.) I hope it helped you, or at least made sense.

Also, if you have any other further questions about your pneumatics system, you can draw up a brief schematic of how you set it up, scan it, and e-mail it to me at merciless_irony@hotmail.com and we (Team 393) can try to give you any help that we can.

Good luck with your building,
Danielle 393