Abstract: This invention reduces the size of the solenoid section of the control valve and simplifies its mechanism. In particular, the invention is intended to enable the control of a variable capacity compressor. In the differential pressure section B.sub.1, a path is formed between a compressor's P.sub.c pressure introducing port 15c and a suction side. In this path a P.sub.c valve disc 17 is installed which engages with or disengages from a valve seat 15e.sub.2 formed in the path on the suction side of a valve opening 15e.sub.1. The P.sub.c valve disc 17 is urged by an adjust spring 20 to close the valve opening. In the solenoid proportional control section B.sub.2, a plunger chamber R.sub.3 is formed which has a P.sub.d pressure introducing port 15g. A plunger 24 is movably installed in the plunger chamber R.sub.3 and is fitted with a connecting rod 25, which passes through a through-hole 15d.sub.1 in the solenoid proportional control section B.sub.2, the P.sub.

Abstract: The expansion valve has an operating pressure setting member that can adjust the operating pressure of a pressure-activated diaphragm by moving a spring retainer of an operating spring against the force the spring which is interposed between the diaphragm and the spring retainer. The operating pressure setting member, after being set at a desired setting position, is securely fitted into and crimped by a secondary coolant flow pipe. The operating pressure setting member has a coolant passage for the coolant to pass through. This construction can completely prevent leakage of the coolant from the operating pressure setting member as would occur with conventional expansion valves whose operating pressure setting member is not installed inside the secondary coolant flow pipe.

Abstract: In a thermostat type operating temperature setting apparatus, a slider is employed to preset the operating temperatures of electric appliances by sliding the slider along a long sliding path. The operating temperature setting apparatus includes a frame, a converter for converting temperature changes into pressure variations, a thermostat switching member for selectively changing bistable switching positions in response to the pressure variations, a rod for adjusting the operating temperature, a tension spring coupled between the adjusting rod and the switching member, for biasing the adjusting rod in a first direction, a slider, and a cam lever pivotably journaled to a fulcrum fixed on the frame and connected to the adjusting rod, for being slidably in touch with the slider. The setting apparatus further includes a conical compression spring mounted on the adjusting rod, for biasing the adjusting rod in a second direction opposite to the first direction.

Abstract: A five-way valve includes a cylindrical valve body. A piston member is employed in one end of the cylindrical valve body to define a high pressure chamber and a first pressure chamber. A defrosting valve is employed in the other end of the cylindrical valve body to define a second pressure chamber. A slider valve member coupled to the piston member is slidably employed within said high pressure chamber into which the high temperature and high pressure refrigerant from the compressor is induced. An electromagnetic valve is connected between both the first and second pressure converting chambers, and the inlet of the compressor.

Abstract: Reversible four-way valve for the refrigerating system. It has a cylindrical valve body through which a single piston is adapted to reciprocate slidably. This single piston divides the cylindrical valve body into two chambers. One of the two chambers is used for admitting high pressure gas thereinto whereas the other is assigned for controlling the piston in counteracting the high pressure gas. For this purpose, the piston is formed with a pressure equalizing hole therein to communicate the two chambers with each other while the piston is urged toward the chamber into which the high pressure is admitted. This is done by a compression spring having a force stronger than required to overcome all resistance when both chambers are under the equal pressure. Since the reversible valve has only two chambers, compact design is possible and the operation is stable.

Abstract: A refrigerating cycle composed of a compressor, a condenser, a pressure differential valve, a throttle, an evaporator and a check valve. The check valve is connected back to the compressor. The above mentioned pressure differential valve is divided into a valve section and a control section. The control section is further divided into two chambers by a diaphragm. Two pressure introducing tubes are connected to the pipe on the respective sides of the check valve. During operation of the refrigerating system, low pressure prevails on both side of the check valve. However, stoppage of the rotary compressor causes a high pressure refrigerant leak on the suction side thereof with the result that the high pressure refrigerant is introduced into the one of the chambers of the control section while the other pressure introducing tube on the other side of the check valve provides low pressure communication with the other chamber.

Abstract: A pressure differential valve connected to a refrigerating circuit piping which, when a refrigerating cycle stops, blocks the high pressure coolant from diffusing into the low pressure section. Said pressure differential valve comprises a valve body having a first inlet, a first outlet, a second inlet and a second outlet; a valve disk installed in a valve chamber between the first inlet and the first outlet to open or close the passage between the first inlet and outlet, the valve disk being urged to open by a spring; a diaphragm installed between the second inlet and the second outlet to form pressure chambers; and a check valve secured to the diaphragm and communicating to both of the pressure chambers; whereby when the check valve is closed, the diaphragm causes, through a connecting rod, the valve disk to close. Said valve disk has radially projecting guide vanes attached to the axially extending portion of the seat-contacting disk to form spaces through which coolant can flow.

Abstract: A pressure responsive switch in which a bellows abuts against a leaf spring at substantially the same point where a switch actuating rod abuts against the leaf spring. Within the casing, the bellows is attached to a first inner end and a switch section is provided at a second inner section. The actuating rod extends in a direction of the bellows expansion between said bellows and the switch section. A first end of the rod is positioned opposite the bellows. The leaf spring is interposed therebetween to counteract the bellows expansion and exert balanced force to the actuating rod.

Abstract: A reversible valve for reversible refrigeration cycle. The valve means used therein is a hollow cylindrical body longitudinally extending within the valve body. It has a pair of inclined annular walls projecting from around the hollow cylindrical body to define an annular chamber therearound in cooperation with the valve body such that the annular chamber communicates the suction tube selectively with either one of said pair of tubes.

Abstract: A four-way valve for reversible refrigeration cycle. It comprises a casing, a delivery tube in communication with a compressor and opening into the casing, a suction tube in communication with the compressor and opening into the casing, a pair of tubes in communication with two heat exchangers respectively, and opening into the casing one on each side of the suction tube, valve means for communicating the suction tube selectively with either one of the pair of tubes; and a two-way pilot valve mounted longitudinally to the casing. The two-way valve longitudinally mounted to the valve body of the reversible valve permits its vertical installment, thus remarkably reducing horizontal space required therefor.

Abstract: A defrost thermostat provided with a timer driven cam mechanism for preventing repetition of defrosting operation shortly after the completion thereof which is apt to be caused due to the temperature lowering of the external unit acting as an evaporator during the indoor heating operation. The cam mechanism includes a masking member coaxially mounted on the disc cam to block the cam recess while leaving a gap for permitting an initial defrost operation. During the defrost operation, the cam follower goes out of engagement until it rides over the masking member. Once the defrost operation is completed, it will not be repeated immediately thereafter, thus ensuring stable normal indoor heating operations.

Abstract: An electrically operated reversible expansion valve. It has a valve body formed with a primary port, a secondary port, a valve seat defined between the primary and secondary ports, and a slide bore in an opposing relation to said valve seat. A valve needle is supported by the slide bore. In order to prevent the fluid from being admitted into a bimetal chamber through the slide bore, a bypass is provided between the primary port and the slide bore.

Abstract: A temperature responsive expansion valve. The opening degree of a first valve body is adjusted by comparing an actual superheating degree with a predetermined reference superheating degree. A temperature responsive expansion valve comprises a valve needle disposed within the first valve body, said valve needle being driven by a difference between the refrigerant pressure on the primary side and the refrigerant pressure on the secondary side, said valve needle moving to enlarge the area of flow path within the valve opening when the pressure differential between the primary and secondary sides is smaller than a predetermined reference value.

Abstract: A self-registering temperature control device in which an electronic control section for controlling air temperature in a refrigerated container and an automatic temperature recording section are accommodated in a housing is provided. This structure permits easy survey of all the units concerned with temperature controlling and recording.

Abstract: A small-sized power relay for automatic control of an air conditioner in response to the signal from an electronic thermostat. This relay, being operative in response to an ultra low current from the electronic thermostat, is instrumental in switching on and off the large current used in air-conditioning. Further, the manufacturing cost is substantially reduced.

Abstract: An electromagnetic pilot type valve having at least one auxiliary pilot valve disposed and operatively connected between the pilot valve and the main valve. The auxiliary valve is operated in response to the pilot valve to operate the main valve. With this construction a main valve body of a relatively large diameter can be operated with a small electromagnetic pilot valve, so that the whole construction of the valve can be compactly made.

Abstract: A pressure switch assembly comprising a bellows expansible in response to a working pressure, an L-shaped actuating plate pivotably responsive to the expansion of the bellows and actuating a microswitch, an adjustable compression spring arranged against the bellows, an adjustable tension spring connected against the compression spring through the actuating plate and a stopper of the tension spring. The arrangement of the tension spring, the actuating plate and the stopper is simplified by making the spring directly connect with the actuating plate to eliminate a connection member.

Abstract: A pilot valve-type evaporating pressure-regulating valve used in refrigerators comprising a valve sleeve having an outer and an inner chamber, a piston valve member sliding in said inner chamber and having an equalizing hole connecting the interior of the piston and the inner chamber, a pilot valve having a pilot chamber provided in the end wall of the valve sleeve and covered with a diaphragm, a pilot passage formed in said end wall to connect said pilot chamber with said inner and outer chambers, and a ball valve member kept in connection with said diaphragm and normally closing and opening said pilot passage in response to the pressure in said inner chamber by movement of said diaphragm. The diaphragm is moved by the pressure-set force of a spring which is, however, variable and adjustable from the outside by rotation of a screw.

Abstract: A reversing valve means for use with a reversible refrigerating cycle system in which a selector valve is actuated by pressure difference in the refrigerant gas and not by any mechanical means such as spring or the like. Said valve means is simple in construction and excellent in durability, enabling sure switchover of a heating cycle to a cooling cycle and vice versa.

Abstract: A system for defrosting a heat pump system employing a temperature difference type defrosting apparatus, wherein a heat sensitive means is provided at one portion of a pipe connecting an indoor heat exchanger with a four-way valve, and means provided between the pipe and the heat sensitive means for controlling the time required for transmitting the temperature of the pipe to the heat sensitive means. Owing to this system, the defrostation can be completely conducted and the defrosting cycle can terminate as soon as the defrosting has completed.