Abstract: A refrigerating cycle with a by-pass duct 5 in which heat exchange for heating is arranged to be performed in an evaporator 4 without passing refrigerant through a condenser 2 is designed to perform an auxiliary heating mode suitable for the instantaneous conditions by controlling the amount of refrigerant circulating in response to the load and the like. A by-pass duct 5 for supplying the refrigerant from the compressor 1 to the evaporator 4 without passing it through the condenser 2 is placed in juxtaposition. Between the outlet of the evaporator 4 and the inlet of the compressor 1 an accumulator 6 for temporarily storing low-pressure refrigerant liquid is provided so that the amount of refrigerant circulating is controlled by accumulator 6 while the refrigerant circulates via by-pass duct 5 without passage through condenser 2.

Abstract: In a four-way directional control valve of simplified construction and reduced manufacturing costs, first and second hollow cylindrical valve elements are arranged coaxially. Adjacent to opposite ends of the valve elements, first and second valve seats and first and second valve closure elements are provided. First and second pressure-regulating chambers are arranged between separator walls of the valve elements and first and second partition walls associated to the first and second valve seats. A pilot valve can be switched between switching positions for introducing high-pressure fluid originating from a first pipe into the first or second pressure-regulating chamber via a common high-pressure passage, a high pressure introducing hole and two pilot holes, respectively, associated to the pressure-regulating chambers.

Abstract: A four-way selector valve comprises a valve case connected with a first pipe, a separate chamber communicating with a second pipe, a first valve seat ring in communicating path between a connecting portion of a third pipe and a space of said valve case, a second valve seat ring in a communicating path between a connecting portion of a fourth pipe and said space, a moveable valve element assembly for alternating co-operation with said first and second valve seat rings, and a valve drive means connected to said moveable valve element assembly to at least selectively interconnect said first pipe either with said third pipe or said fourth pipe and simultaneously the remaining one of said third or fourth pipes with said second pipe, wherein first and second valve disks are pressed essentially in the direction of the axis of the associated valve seat ring in closing direction by remanent forces onto said first and second valve seat rings, and first and second cylindrical and hollow valves are moveable substantially

Abstract: In a heating system having a refrigerating circuit accompanied with a sub-condenser, an air conditioner with the sub-condenser is designed with simplified piping structure and easy piping work. The system can be easily installed to an electric car and other vehicles. One block 11 is provided, in which a bypass flow path 9, a refrigerant returning flow path 10, connections 12, 13, 14, and 15 between both flow paths 9 and 10 and refrigerant main flow pipe 8, plural solenoid valves 21, 22, and 23 and plural check valves 31, 32, 33, and 34 to control flow passing states at the both flow paths to the refrigerant main flow pipe 8 are incorporated.

Abstract: A capacity control device for variable-capacity compressors with a high-pressure valve portion 36 for opening or closing the communication between the discharge chamber 21 and the crank case 12; a low-pressure valve portion 41 for opening or closing the communication between the suction chamber 20 and the crank case 12; a valve open-close member 35 for opening or closing so as to reverse the open-close relationship between the high-pressure valve portion 36 and the low-pressure valve portion 41 by advancing or retreating; a pressurising chamber 53 for applying pressure to the valve open-close member 35 in a direction that opens the high-pressure valve portion 36 by a wider effective pressure-receiving area than that of the high-pressure valve portion 36. The device is driven with only small actuation forces by an electromagnetic solenoid 50 to open or close a communicating path between the discharge chamber 21 and the pressurising chamber 53 (FIG. 1).

Abstract: In an expansion valve for controlling the flow rate of a refrigerant supplied to an evaporator of a refrigerating system, a temperature-sensing chamber is provided to sense the temperature of the refrigerant returning from said evaporator and to actuate a valve mechanism in order to regulate the flow of refrigerant supplied to said evaporator. An adsorption means provided inside the temperature-sensing chamber to adsorb a liquefied part of a gas charge within said chamber in order to hold said liquefied part away from warm wall parts inside said chamber. In addition, or as an alternative, said temperature-sensing chamber is separated from a return passage of said refrigerant by thermal-transfer-delay means for delaying the thermal transfer of a temperature change from the refrigerant to a sealed charge within said temperature-sensing chamber. Said thermal-transfer-delay means can be made as a flow restrictor for supressing an excessive flow between said chamber and said return passage of the refrigerant.

Abstract: A pressure transducer having a magnetoresistive element and a magnet displaced with a diaphragm. A magnet supporting device is mounted on an element supporting device both for slidable movement in the displacement-direction of the magnet and for rotatable movement about an axis in the direction, so that the pressure transducer is capable of having a O-point adjustment and a magnetic sensitivity adjustment made independently of each other without interaction between the two when the transducer is assembled.

Abstract: A pressure converter which comprises a cylindrical main body consisting of an outer casing portion and an inner casing portion, said outer casing having a pressure inlet and being divided by a diaphragm into an air-tight chamber above the diaphragm and an operation chamber below the diaphragm, a piston supported by a pair of annular spring plates within the operation chamber for vertical movement and having an engaging member provided at one end, a stopper interposed between the spring plates, a magnetic resistance provided in a lower portion of the operation chamber to produce output voltage which varies depending upon the position of a permanent magnet positioned on a movable member in opposition to the magnetic resistance and a spring anchored to the inner casing portion and the movable member to normally bias the movable member to engage the piston.

Abstract: There is provided a dual action pressure switch which comprises a casing having a pressure inlet, a diaphragm secured to and extending across the interior of the casing to define a pressure receiving chamber in the casing, a piston disposed on the side of the diaphragm opposite from the pressure receiving chamber for vertical movement subjected to pressure through the diaphragm, a holder biased to engage the piston under the force of a spring, a pair of stationary terminals having the lower ends extending downwardly beyond the lower end of the casing, a resilient disc disposed within the piston below the diaphragm for resiliently warping in one and the opposite directions and leaf springs subjected to the resilient force of the disc through a rod.

Abstract: There is provided a three-function pressure switch adapted to be provided on the higher pressure side of the cooling cycle circuit in an automobile cooling device.The three-function pressure switch comprises a casing including a pressure inlet and a pressure receiving chamber, a diaphragm disposed within the pressure receiving chamber across the chamber, a first resilient disc disposed below the diaphragm for resilient warping subject to pressure from the chamber through the diaphragm, a first piston positioned below the disc for vertical movement as the disc warps, a holder for engaging the first piston, a second resilient disc disposed below the holder for warping as the holder moves, a first electrical switching section adapted to opened and closed by the first resilient disc and a second electrical switching section adapted to be opened and closed by the second resilient disc.