Abstract: A rotationally indexing valve capable of directing refrigerant flow to various zones of a heat exchanger is disclosed. A piston is mounted for reciprocal movement within the valve casing. Means are provided for rotating the piston between selected positions as the piston reciprocates, each position connecting a valve port to a liquid chamber for directing flow therethrough.

Abstract: Apparatus and a method for operating a refrigeration system without reverse cycle defrost are disclosed. A heat exchanger is divided into a plurality of zones, one zone being constantly utilized as a subcooler to both defrost said zone and to subcool the refrigerant. The remaining zones of the heat exchanger are utilized as an evaporator as is known in the art. A selector valve which is capable of indexing liquid refrigerant flow between zones and receiving gaseous refrigerant from the remaining zones is also disclosed. Additionally, a header arrangement having both expansion means and a conduit controlled by check valve is utilized to direct refrigerant flow from the subcooled zones to the remaining zones of the heat exchanger which act as an evaporator.

Abstract: Apparatus comprising a combination tube support for supporting tubes within a shell and tube type heat exchanger and baffle for directing fluid flow within the heat exchanger. A baffle lip is mounted on a baffle body to provide a seal with the interior surface of the heat exchanger shell. A foot having support surfaces of varying heights is used to support the baffle body to prevent the weight of the baffle body and the tubes contained therein as well as other forces from collapsing a portion of the baffle lip.

Abstract: A flow divider for use in a direct expansion heat exchanger coil as typically utilized in an air conditioning system. The divider is adapted to receive an entering flow of refrigerant from a first circuit and equally distribute the flow into a plurality of leaving circuits. The geometry of the divider is arranged so that the force of gravity acting upon the working fluids passing therethrough is negated thereby enhancing the ability of the divider to produce an equal flow distribution in each of the leaving circuits.