Abstract: A compressor intake system including an end cap having an interior surface, an exterior surface, a perimeter rim, a groove proximate the perimeter rim, and a substantially centrally disposed extended portion including a plurality of air inlet passages, an O-ring configured to be circumferentially disposed proximate the interior surface of the end cap at the groove, a filter including a first end configured to be disposed adjacent the air inlet passages and the interior surface of the end cap and a second end, and a retainer including a plurality of openings wherein the retainer is configured to be disposed proximate the second end of the filter so as to retain the filter proximate the air inlet passages and the openings.

Abstract: A compact and highly portable combination pressure swing adsorption apparatus and product gas conservation device for medical use, to produce efficiently a gas with a high concentration of oxygen and to deliver the oxygen concentrated gas to a user at selectable times and in selectable doses, in which the operating components are detachably mounted together as a single unit.

Abstract: Hypoxic delivery apparatus producing from ambient air a product gas having a lower levels of oxygen concentration and delivering the product gas to a user of the apparatus in pulse doses. Alternatively, the apparatus may include a selector for alternately delivering either a nitrogen enriched gas or an oxygen enriched gas to the user.

Abstract: A noise muffler for the exhaust of waste gases from apparatus such as an oxygen concentrator, including a muffler core with an inlet to receive the waste gases and a plurality of bores in the core first to direct the waste gases through a filter material and a cap enclosing the filter material and forming a plurality of outlets to direct the waste gases out of the muffler, the bores and outlets positioned to cause the waste gases to change their direction of flow multiple times before exiting the muffler.

Abstract: The solenoid valve of the present invention includes an armature with a protrusion and a plug nut with a recess for receiving the protrusion. The protrusion includes a polymer o-ring. The protrusion is configured such that it slides freely within the recess. The o-ring contacts the plug nut to prevent further motion of the armature toward the plug nut after the protrusion has entered the recess.

Abstract: The present invention provides a noise muffler for the exhaust of a gas handling apparatus. The muffler of the present invention includes a muffler core having a central inlet and an integral flange. A cap engages the integral flange to form a chamber around the central inlet. The chamber is filled with a filter comprising woven polymer fibers such as a felt. A plurality of radial bores connect the central inlet to the chamber. The chamber includes a plurality of outlets remote from the radial bores.

Abstract: The solenoid valve of the present invention includes an armature with a protrusion and a plug nut with a recess for receiving the protrusion. The protrusion includes a polymer o-ring. The protrusion is configured such that it slides freely within the recess. The o-ring contacts the plug nut to prevent further motion of the armature toward the plug nut after the protrusion has entered the recess.

Abstract: Hypoxic delivery apparatus producing from ambient air a product gas having a lower levels of oxygen concentration and delivering the product gas to a user of the apparatus in pulse doses. Alternatively, the apparatus may include a selector for alternately delivering either a nitrogen enriched gas or an oxygen enriched gas to the user.