How can i make an alternating pneumatic switch?

[Jobo]

I'm trying to build several pneumatic powered walls, constantly going up and down, all controlled by a single pneumatic lever that is constantly switching from left to ride, ergo creating the up and down motion. 

 

 

Do any of you guys have any good examples, or ideas on how to create such an alternating pneumatic lever? Thanks in advance :)

Also, i have an electric pump that is traditionally used to power aquariums. It provides non stop high power airflow to any pneumatic creation i choose to create. Thanks again.

[pleegwat]

Two pumps, two valves, with each pump actuating the other pump's valve.

[allanp]

1 hour ago, pleegwat said:

Two pumps, two valves, with each pump actuating the other pump's valve.

By "pump" I assume you mean pneumatic cylinder/piston/actuator? Only one pump (in this case aquarium pump) would be required.

But yes, this would work. 

The pumps supply is fed to both valves. Valve A controls pneumatic piston B. Piston B is then mechanically linked to valve Bs lever, so that also moves. Valve B controls Piston A so now piston A moves. Piston A is mechanically linked to valve As lever so now that moves, and the cycle repeats over and over again (this is  the same as the b-model of 8868). Then you just link the wall to the movement of the pistons.

[pleegwat]

2 hours ago, allanp said:

By "pump" I assume you mean pneumatic cylinder/piston/actuator?

Yes, sorry.