TYPE30 7V Air Compressor Block

Also called a reciprocating vacuum pump block or bare piston vacuum pump block: A vacuum pump block is a part doing the evacuation of air from a vessel or an enclosed volume. A piston moving in a reciprocating motion within the cylinder evacuates the gas. It is driven by an electric motor or another form of rotation. The pistons are moving up and down and air flows from the volume to be evacuated, into the cylinder, and the piston discharges it to the atmosphere.