lol thats hilarious, may hook it up to the shop vac. Jk. I know its a simple concept, makes a lot more sense now that i know the orfice controls the flow. I honestly thought there was just that one valve in there.
There is just one valve in there; double ended and tapered, and spring-loaded. The spring is the calibration key that responds to engine vacuum, to vary the amount of flow. The orifice controls the max flow, and the seat the minimum