Abstract: An island refrigerated display case can be constructed so as to in effect constitute to back-to-back display cases that can be arranged as a separate aisle within a supermarket. Such an island refrigerated display case has two interior display spaces separated by a partition wall with each display space having its own access opening so as to enable refrigerated products to be removed from that portion of the case. Encircling each of the interior display spaces is an associated refrigeration air conduit. Each of the refrigeration air conduits has an inlet and outlet opening positioned so as to direct air across the corresponding access opening for the interior display space. Thus during the refrigeration cycle of operation, a refrigerated air curtain is formed between the corresponding outer wall and the center partition wall so as to extend across the associated access opening. The portions of the refrigeration air conduits that extend through the partition wall can be joined so as to form a single chamber.

Abstract: An electro-vacuum relay 10 is disclosed comprising a thermally responsive actuator 18 mounted on the lower end of a housing 14, 16 which defines a vent chamber 66. Upper and lower fluid ports 38, 40 are integrally molded into the housing and communicate with vent chamber 66. A pair of electrical terminals 22 and 24 include tab portions 30, 32 which extend through housing cover 16 and into the vent chamber. A carrier member 68 is movable in the vent chamber and has reacting against its upper end a compression biasing spring 88 and against its lower end an output member 64 of thermal actuator 18. A rectangularly shaped elastomeric valve member 72 is mounted in an opening 74 in the carrier and has an upwardly extending double beaded sealing surface 76 around its periphery that engages with a valve surface formed by an inner wall portion 42 of main housing 14.

Abstract: In a central air conditioning system wherein air flow is regulated by bellows inflation which is controlled by a bleed-type thermostat, simultaneous heating and cooling in a zone is prevented by disabling the bleed-type thermostat when the heating system is activated.

Abstract: An adjustment mechanism for adjusting the maximum flow rate of conditioned air in an air distribution system controlled by a pneumatic control circuit. An air bladder controls the distribution of air, and the pressure is bled from the bladder under the control of a diaphragm against which pressure is fed back from the downstream side of the bladder. The control orifice through which the bladder pressure is exhausted is formed in the end of an exhaust tube that is axially adjustable. A cam and set screw arrangement serves to extend and retract the exhaust tube to move the control orifice toward and away from the diaphragm for adjustment of the maximum flow rate.

Abstract: A steam trap has a bimetallic control element provided on the prepressure side and a locking part which is biased by the prepressure in the opening direction and which is actuated by the bimetallic control element. The bimetallic control element is provided with at least one bimetallic snap disk and the valve seat is stroke-movably positioned, whereby the maximum stroke path of the valve seat is only a part of the operating stroke of the locking part.

Abstract: A device capable of controlling and maintaining the temperature of water discharged from a kitchen faucet or shower at a preselected temperature level. An air-filled enclosure disposed within a mixing chamber regulates the precise amount of hot and cold water entering the mixing chamber as a function of the rate of thermal expansion of the air. A selector control is provided to set the preselected temperature level.

Abstract: A prime mover of internal or external combustion type is utilized to furnish shaft work for the driving of an electrical generator, a refrigeration compressor and/or a combination of both. Waste heat emanating from the prime mover and/or a refrigeration system, of which said compressor is a component, is directed to provide utility heating and/or air conditioning, said heating and air conditioning thereby becoming useful byproducts of a means for generating electrical energy and/or furnishing refrigeration.

Abstract: A self contained freezing device for forming a plug of ice within a pipe section. A refrigeration unit supplies refrigerant to a cradle like freezer unit within which the section of pipe to be frozen is held in spaced relation to the inner face of the freezer. The space between the underside of the pipe and the inner face of the freezer is filled with water, for example by spraying. As the water freezes, in contact with the cradle like freezer unit, it covers the outer surface of the pipe section with an ice jacket. Alternatively, a bag of freezable jel may be substituted for the water spray and placed over the inside face of the freezer; and then the pipe section is placed within the fold of the bag. In the case of either alternative, the refrigerant is maintained inside the freezer, and out of contact with the pipe.

Abstract: What is disclosed is a heat pump apparatus for conditioning a fluid characterized by a fluid handler for circulating the fluid in heat exchange relationship with a refrigerant fluid; two refrigerant heat exchangers; one for effecting the heat exchange with the fluid and a second refrigerant-heat exchange fluid heat exchanger for effecting a low pressure ratio of compression of the refrigerant; a rotary compressor for compressing the refrigerant with low power consumption at the low pressure ratio; at least one throttling valve connecting at the inlet side of heat exchanger in which liquid refrigerant is vaporized; a refrigerant circuit serially connecting the above elements; refrigerant in the circuit; a source of heat exchange fluid; heat exchange fluid circulating device and heat exchange fluid circuit for circulating the heat exchange fluid in heat exchange relationship with the refrigerant.

Abstract: A thermostat construction having a valve unit for directing a pneumatic signal to a pneumatically operated control device in relation to the force differential between the temperature sensed by the temperature sensing unit thereof and the temperature setting of a temperature setting unit thereof, a lever being pivotally mounted to the construction and being operatively interconnected to the valve unit at a first portion of the lever and to the temperature setting unit and the temperature sensing unit at a second portion of the lever.

Abstract: An ice maker for use in a freezer compartment of a refrigerator including a flexible tray having cavities for forming ice pieces. The front of the ice tray has a handle and the rear has a first and second spaced guide element projecting therefrom. There is provided a support structure having a front wall with a triangular-shaped opening with all three sides of the opening being outwardly curved and dimensioned to receive therein the ice tray handle in guiding rotation thereof. There is also provided a rear wall having a track with a vertical inwardly curved portion with a terminal end at the top thereof and a horizontal downwardly curved portion joining the bottom of the vertical curved portion, said track being dimensioned to receive in guiding movement said first and second spaced guide elements on the ice tray.

Abstract: A method and apparatus for defrosting cooling elements in a freezer chest of the type displaying frozen food items. The chest, having an open top, is provided with a channel around the food items through which air is circulated by means of a fan. The air is also directed over the open top of the freezer. Upon the defrost cycle, the cooling elements are shut down, and the air flow is reversed and directed away from the food items whereby air is drawn into the channel from the atmosphere outside of the freezer chest.

Abstract: A thermostatic mixing valve is provided comprising a thermostat body arranged in an elongated housing and actuating an axially displaceable control member, which regulates the inlet areas for the warm and cold water. The control member cooperates with a sleeve member for regulating one of the inlet areas. The sleeve member is axially displaceable in the housing by the pressure from one of the liquids and this movement is limited by a stop ring. The end of the sleeve member remote from the control member cooperates with an axially displaceable closing sleeve regulating the outlet area of the mixed water. Pressure means actuated by an actuating lever acts upon the closing sleeve by pivoting said lever about an axle perpendicular to the housing. The mixed water temperature being regulated by rotating said lever, at which means being arranged to axially displace the thermostat body.

Abstract: A thermally responsive valve includes first and second bimetallic disks which are adapted to snap-over in response to first and second predetermined temperatures. First and second inlet ports are connected to vacuum and atmospheric pressure sources respectively and first and second outlet ports are connectable to first and second vacuum actuators respectively. The thermally responsive valve further includes first and second valve members, one of which controls the communication of vacuum to the first vacuum actuator in response to the snap-over action of the first bimetallic disk and the other of which controls the application of vacuum to said second vacuum actuator in response to the snap-over action of the second bimetallic disk. When communication between the vacuum source and the first and second vacuum actuators is interrupted by said first and second valve members, the first and second actuators will be then connected to the atmosphere through the second inlet port.

Abstract: The disclosure relates to an improved temperature responsive control arrangement. It includes a valve member, a chamber, and a bellows disposed in said chamber for controlling the position of the valve member in response to the temperature of fluid flowing through the chamber. The arrangement is particularly suited for use in steam traps. There are surfaces in the chamber for distributing fluid flowing through the chamber around the bellows to promote rapid expansion and contraction of said bellows with changes in temperature of the fluid flow through said chamber. The chamber has an outlet centrally located at one end thereof, and the distributing surfaces include a plurality of fluid inlets at the end of the chamber opposite from the outlet, the fluid inlets being distributed about the periphery of the chamber.

Abstract: The coolant outlet housing of an engine contains a horizontally movable type thermostat and an air vent bypass passage located in the housing at a point above the thermostat to assure the bleed of air from the coolant to the radiator during the filling procedure, the passage containing a one-way ball check valve to permit the bleed of air but prevent the passage of coolant past a closed thermostat to the radiator.

Abstract: A thermally operated mixing valve including a single control knob, a valve member, a thermally responsive control member, and means for positively shutting off the flow of mixed liquid from a mixing chamber when the valve is closed.The valve member is a "jumper" element movable in opposite directions in the control chamber to restrict or cut off the flow of hot or cold liquid respectively. The valve member can abut against a spring loaded annular abutment ring to shut off the flow of hot liquid to the mixing chamber and when the abutment ring reaches the limit of its travel the valve member can move away from it to allow hot liquid to flow to the mixing chamber around the outside of said valve member.

Abstract: A control for an air conditioning system of the type wherein a supply of air is conditioned at a central station, conditioned air is conducted through a supply air duct to a plurality of zones, and a plurality of discharge terminals discharge conditioned air from the supply air duct into the zones. The control comprises a plurality of air control valves, wherein each discharge terminal includes an air control valve for controlling the amount of conditioned air discharged into a zone by the discharge terminal; and a plurality of thermostatic adjusting devices, wherein each discharge terminal includes a thermostatic adjusting device for adjusting the air control valve to inversely vary the amount of air discharged into the zone in response to changes in the air temperature thereof.

Abstract: A refrigerator having a freezer compartment on top and a fresh food compartment below with an air duct connecting the two compartments. A temperature control system and method of controlling is provided and includes a temperature sensing element located at the top of the fresh food compartment and shielded from the stream of cold air being directed into the fresh food compartment. The temperature sensing element changes the temperature in both the freezer and fresh food compartments without changing the constant ratio of those respective compartment temperatures. An air flow assembly divides the cold air entering the fresh food compartment through the connecting air duct between the top of the compartment and the bottom. The air flow control assembly is arranged to divide the cold air stream such that the ratio of the difference in the freezer and fresh food compartment temperatures is changed.

Abstract: A pneumatically operated system having a control unit provided with a single inlet interconnected to a one pressure level pneumatic source and having an outlet arrangement interconnected to a pneumatically operated heating and cooling heat exchanger to control the same in either its heating mode or its cooling mode in relation to the pressure value of the pneumatic signal being directed thereto from the control unit through the outlet arrangement thereof, the control unit having a temperature sensing arrangement for controlling the value of the signal in relation to the sensed output temperature of the heat exchanger by operating a bleed arrangement of the control unit.