Wow, that was quick
Well, I want to apply a positive air pressure through thin flexible tubing. The pressure must be sudden, and large. One solution is to apply positive pressure to the tubing (using a CO2 tank for instance), and to use a solenoid valve (with the tubing connected to "normally closed") to allow the positive pressure to act on the tubing downstream of the solenoid valve. OR, I can use a solenoid actuator (a "push" solenoid I think) and press onto a large plastic syringe that pushes air into the tubing (thus creating the positive pressure).
Point motor looks promising, I'll look more into those. Thanks!