Abstract: A filter drier finding application in a refrigeration system, for example, includes a tubular housing having improved fluid flow characteristics within the filtering media of the filter drier. The filter drier includes an axial arrangement of elements commencing at the inlet end of the housing with an absorbent material fill portion which extends across the diameter of the housing. The absorbent material fill portion includes first and second boundary layers spaced from one another, and absorbent material positioned between the boundary layers. The boundary layers are pervious to fluid flow. The axially innermost boundary layer, with respect to the inlet, includes a central hub portion which seats a first end of a coil compression spring. The coil compression spring has a tubular body part and an enlarged second end.

Abstract: A filter-drier that provides two-way or bi-directional flow for a heat pump or other refrigeration system is described. This filter-drier contains a spring-loaded check valve at each end of an adsorption space containing an adsorbent such as activated alumina, molecular sieve silica gel or combination thereof. Each check valve is surrounded by a filter pad and a flexible diaphragm. Reverse-discharge and separate-discharge embodiments are particularly described.

Abstract: Upper and lower contiguous filter sheets are bonded to each other at the outermost contiguous edges thereof to form an enclosure. The enclosure is divided into a plurality of sectional compartments which are isolated from each other by dissolving barrier sheets. The dissolving barrier sheets consist essentially of a water soluble carboxy methyl cellulose compound. Each of the sectional compartments contain a predetermined quantity of absorbent granules. The barrier sheets function to dissolve when the granules have absorbed a predetermined amount of moisture so as to provide for increased space in which to contain moist granules.

Abstract: A filter-drier assembly adapted for bidirectional flow in heat pump systems. The filter-drier assembly includes a pair of bypass lines in the liquid line, each bypass line circumventing one of the expansion devices located in the liquid line. An expansion device is located ahead of the outdoor coil for use in one mode of operation and a second expansion device is located ahead of the indoor coil for use in the other mode of operation. A filter-drier unit is disposed in each bypass line, each filter-drier unit including a check valve enabling flow through the associated bypass line and filter-drier unit in one direction and precluding flow in the opposite direction. The check valve of each filter-drier unit precludes flow in the bypass line when its associated expansion device is operable in one mode of operation. The filter-drier unit includes a shell provided with an inlet and an outlet, and filtering and drying elements in the shell between the inlet and outlet.

Abstract: A filtering unit for use in a fluid pressure system having an inlet port for admitting fluid flowing under pressure through a filter and a desiccant bed to a distributing chamber. During the system's compression cycle, a portion of the fluid under pressure flows from the distributing chamber through metering orifices into a purge cylinder moving a piston therein to the bottom of the purge cylinder. During the system's purging cycle, fluid flowing under pressure is admitted to the bottom of the purge cylinder moving the piston towards the metering orifices causing the pressurized fluid therein to flow at a constant rate in a reverse direction through the filter and desiccant bed into a sump which is exhausted to the atmosphere through a drain valve for renewing the filter and desiccant bed. Also , a one-way valve is provided between the inlet port and the distributing chamber to permit the fluid flowing under pressure to bypass the filter and desiccant bed in the event they become clogged.

Abstract: A filter-drier unit adapted for bidirectional flow in heat pump systems. This filter-drier unit includes an individual filter-drier in each compartment formed on opposite sides of a partition in a shell. A conduit connects the inlet of each filter-drier with the compartment other than the one in which the filter-drier is located. A check valve is connected to the outlet of each filter-drier to enable flow into the compartment in which the filter-drier is located and to preclude backflow, whereby flow into either one of the compartments through an associated shell port passes by the filter-drier in the said one compartment and through the inlet of the filter-drier in the other compartment, and thence into the said other compartment and out through its associated shell port. In one embodiment, the individual filter-driers and the fittings attaching the filter-driers to the partition are relatively laterally offset in the shell.

Abstract: An adsorbent package comprising spunbonded olefin wall means, and adsorbent means confined by said wall means, said wall means being fabricated from planar sheet material formed into tubular shape and having a heat and pressure sealed seam which causes the spunbonded olefin material to become transparent in the area of the seam to permit viewing of the adsorbent therethrough.