Abstract: Filter apparatus for extracting water vapors from a gas includes a housing and a cartridge containing desiccant disposed in the housing. A spring biased follower in the cartridge exerts continuous compressive forces on the desiccant.

Abstract: A system for optimizing compressor output flow when a maximum power consumption limit exists and the compressor inlet pressure can vary. Utilizing the invention the maximum compressor output flow can be obtained even while the inlet pressure to the compressor varies.

Abstract: A swash plate disposed in a housing is a ball bearing assembly. The outer race of the ball bearing assembly is free to move relative to a swash plate drive shaft and also relative to reciprocating members driven by the swash plate and mounted for axial movement.

Abstract: A compressor shielded from crankcase oil by a wall having a hole surrounded by a wiper through which a piston rod assembly passes and having the chamber between the crankcase and the underside of the piston provided with a pressure relief valve and an atmosphere vent having a check valve whereby the chamber is never at sub-atmospheric pressure and there is never gas flow through the wiper toward the piston.

Abstract: A completely sealed, self-contained, liquid-cooled gas compressor is disclosed. It is made up of vertically superimposed and motive power connected electric motor, gas compressor and oil pump coaxially positioned within a vertical sealed cylindrical housing providing an oil sump at its lower end. Heat exchanger tubes are mounted within the oil sump and in an externally mounted heat exchanger for cooling the oil in the sump and cooling compressed gas derived from a series of compressor stages. Cooled oil is caused to continuously flow over the electric motor and compressor to provide cooling and lubrication and sealing of compressor pistons. A special type of axial swash or wobble plate compressor is used to obtain coaxial alignment and direct connection of motor driven shafts.

Abstract: A spiral piston ring made of self-lubricating material and having at least two complete convolutions and having a gradual and continuous taper except for the terminal portions thereof which taper at a steeper angle than the gradual and continuous taper, and with indentations in the convolutions adjacent to the terminal portions which are positioned and which have a size and shape to receive exactly the terminal portions.

Abstract: A pressure vessel adapted for connection in a high pressure gas line and having a coalescent type filter mounted to extract condensate; a vertical guide fitted with upper and lower magnetically operated switches at positions representing high and low condensate levels; a float carried by the guide for vertical reciprocation and having magnetic means for operating the switches; and an electrically operated valve connected to a condensate drain opening and to a control circuit connected to the switches whereby the condensate will be maintained within upper and lower limits.