Multistage air pump with adjustable inter-stage mass transfer and inter-stage sorbent cartridge

A multistage air pump, comprising:

• (a) an upstream stage having an upstream stage inlet and an upstream stage outlet, the upstream stage increasing a pressure of a gas from the upstream stage inlet to the upstream stage outlet;
• (b) a downstream stage having a downstream stage inlet fluidly connected to the upstream stage outlet and a downstream stage outlet;
• and
• (c) a regulating valve in fluid communication with at least one of the upstream stage outlet and the downstream stage inlet, the regulating valve selectively passing pressurized gas prior to the downstream stage inlet to decrease a mass of pressurized gas passing through the downstream stage inlet.

A multistage air pump comprising:

• (a) an upstream stage having an upstream stage piston assembly and a first compression chamber;
• (b) a downstream stage fluidly connected to the upstream compression chamber, the downstream stage having a downstream stage piston assembly and a second compression chamber;
• (b) a handle operably connected to the upstream stage piston assembly and the downstream stage piston assembly;
• and
• (c) a sorbent cartridge fluidly intermediate the upstream stage and the downstream stage.