Abstract: Provided is a motor-driven valve with a simple configuration that can solve hysteresis generated when the rotary direction changes, without greatly changing a conventional motor-driving valve. A friction angle of an external thread and an internal thread of a thread feeding mechanism, a lead angle thereof, and a biasing force of a compression coil spring inserted between a valve shaft and a valve body are set so as to always bias the valve shaft making up the thread feeding mechanism to the valve body in a rotating direction in one direction or in the other direction in both of the upward-moving stroke and the downward-moving stroke.

Abstract: To provide a stepping motor which can precisely and reliably detect stopping of a rotor with respect to a stopper with a simple structure, i.e., positioning of a base point of the rotor, and provide a motorized valve using it. The stepping motor includes a stator 55 and a rotor 57 rotationally driven by the stator 55, and a detection rotor 47 detecting a rotation position of the rotor 57. The detection rotor 47 is rotatably disposed on a co-axial center L with the rotor 57 and rotationally driven via a rotation drive mechanism between the rotor 57 and the detection rotor 47. The rotation drive mechanism has a drive play having a predetermined length or angle in the rotation direction.

Abstract: The invention prevents a pressure receiving space of a pressure sensor from being electrically charged. In a pressure sensor, a diaphragm is attached to a base which is fixed within a cover and a pressure receiving space in which an oil is sealed is formed. A semiconductor type pressure detecting device is connected to a plurality of terminal pins by a bonding wire. A neutralization plate attached to a periphery of the semiconductor type pressure detecting device or a part of the periphery thereof is connected to an earth terminal pin by an earth bonding wire, or is connected to the earth terminal pin by a soldering so as to prevent an insulative medium sealed within the pressure receiving space from being electrically charged.

Abstract: Provided is a motor-driven valve with a simple configuration that is capable of suppressing flow rate loss of fluid and reducing noise caused by the flow of the fluid in the first flowing direction and the second flowing direction, without greatly changing a conventional motor-driving valve. A porous body is fixed to a valve seat member, the porous body being extended at least to be lateral to a valve port and having a cutout part corresponding to a first opening provided at a lateral part of a valve body.

Abstract: To provide a motor-driven valve with a small number of parts, with excellent assemblage, capable of maintaining a large valve port diameter even downsized, and to prevent deterioration of housing environment due to sound caused by the impact and shortened life that are generated by collisions of closing limit stopper parts.

Abstract: There is provided a very reliable three-way solenoid valve that can reliably switch a refrigerant flow passage while ensuring a refrigerant flow rate even under a large-differential pressure environment without increasing the size of an electromagnetic coil and the like. A valve body includes a conduction hole that communicates with a back pressure chamber formed on a side of a second valve element opposite to a second valve seat, a third valve seat that is positioned between the conduction hole and a second outlet, a third valve element that is movably disposed so as to approach and be separated from the third valve seat, a coil spring that biases the third valve element toward the third valve seat, and actuating rods that are interposed between a first valve element and the third valve element.

Abstract: The invention intends to improve a stator which is detachably installed to an outer peripheral portion of a can accommodating a rotor. The stator is integrally formed with a resin mold by arranging a stator assembly (110) within metal molds (300, 310) and injecting a molten resin (P1) from a gate (G1) at one position. An annular plate (160) is mounted to an upper portion of the stator assembly (110) so as to prevent the molten resin from intruding into magnetic pole teeth (120a, 122a), and prevent a weld line from being generated in an outer peripheral surface of the resin mold.

Abstract: A solenoid valve is provided with a valve main body having a valve chamber communicating with an inlet port and a first outlet port, a valve body arranged within the valve chamber, a valve holder retaining the valve body, a coil spring energizing the valve holder, a pipe member having a second outlet port communicating with the valve chamber, a suction element surrounding the pipe member, a coil bobbin winding an electromagnetic coil, and a mold cover surrounding a whole of the coil bobbin, integrated with the valve main body, and defining the valve chamber. The valve holder has a tube body facing to the suction element, and a small tube portion formed smaller in diameter than the tube body, pierced a fluid insertion hole in an intermediate portion, and having a retention portion retaining the valve body in an inner side of a leading end.

Abstract: In the case that a lift amount of a second valve body for controlling a small flow rate is equal to or less than a predetermined amount, a pilot passage is closed by a pilot valve body, and a first valve port is closed by a first valve body for controlling a large flow rate, thereby taking a small flow rate control state in which a flow rate is controlled in correspondence to the lift amount of the second valve body, and in the case that the lift amount of the second valve body goes beyond the predetermined amount, the pilot valve body is moved up in conjunction with an upward movement of a valve shaft so as to open the pilot passage, thereby taking a large flow rate control state in which the first valve body opens the first valve port on the basis of this.

Abstract: A rotary type channel switching valve for use in a heat pump system is provided. The channel switching valve provides a plurality of channel switching means required when switching connection of a plurality of devices to parallel/series connection, e.g., in a system including the plurality of devices including inlet/outlet ports for a fluid. The channel-switching valve can play a role of a plurality of channel switching means which are required when connecting a plurality of heat exchangers in parallel when a refrigerant is passed in a normal direction, and when connecting a plurality of heat exchangers in series when the refrigerant is passed in a reverse direction, for example, in a heat pump including the plurality of heat exchangers, and thereby, can realize simplification of a configuration of the heat pump, reduction in an occupied space, cost and energy consumption, or the like.

Abstract: The invention provides an electrically operated valve which can control a flow rate precisely at a small flow rate distributing time and can circulate a fluid so as to prevent a pressure loss as much as possible at a large flow rate distributing time without an increase of a working and assembling cost. A movable valve seat body forming a main valve port for forming a small flow rate flow path extending from a first inlet and outlet to a second inlet and outlet is arranged between a valve chamber and a lower chamber. The movable valve seat body is structured such that its lower portion is slidably fitted and inserted to the lower chamber, and such as to serve as a float type check valve body for opening and blocking a large flow rate flow path extending from the second inlet and outlet to the first inlet and outlet.

Abstract: A composite valve has a communication path, a second valve port and a pilot passage. First and second valve bodies are arranged to be moved up and down in the same direction, and are away from each other only at a predetermined distance. In the case that a lift amount of the second valve body for a small flow rate control is equal to or less than a predetermined amount, said pilot passage and a first valve port are respectively closed by a pilot valve body and the first valve body, thereby taking a small flow rate control state. In the case that the lift amount of said second valve body goes beyond said predetermined amount, said pilot valve body is moved up by the upward movement of a valve shaft to open said pilot passage, thereby taking a large flow rate control state.

Abstract: A flow reversing valve includes a reversing valve main body adapted to assume a first circulatory state where a first main valve part is in a fully-open state and a second main valve part is in a fully-closed state and a second circulatory state where the first main valve part is in a fully-closed state and the second main valve part is in a fully-open state; and a flow regulating valve adapted to regulate the pressures of the respective back pressure chambers and of the first main valve part and the second main valve part. The flow regulating valve places the reversing valve main body in the first circulatory state by gradually reducing the pressure of the back pressure chamber of the first main valve part, and in the second circulatory state by gradually reducing the pressure of the back pressure chamber of the second main valve part.

Abstract: A composite valve has a communication path communicating a first valve chamber with a second valve chamber, a second valve port communicating the second valve chamber with an outflow port, and a pilot passage communicating a back pressure chamber with the outflow port. In the case that a lift amount of a second valve body for a small flow rate control is equal to or less than a predetermined amount, the pilot passage is closed by a pilot valve body, and a first valve port is closed by a first valve body, thereby taking a small flow rate control state. In the case that the lift amount of the second valve body goes beyond the predetermined amount, the pilot valve body is moved up in conjunction with the upward movement of a valve shaft so as to open the pilot passage, thereby taking a large flow rate control state.

Abstract: A female screw member includes a female screw part with a female screw, and a projection part projecting in the direction of a center shaft of the female screw and having a working face in the rotating direction centering on the center shaft. The female screw part and projection part are integrally molded with a resin. The projection part has a spiral inclination face spirally inclining by one round from the working face centering on the center shaft of the female screw. The height H of the working face is equal to or smaller than a pitch P of the female screw. Using the projection part as a fully opening fixing stopper, a motor operated valve includes a valve main body having a valve seat, the female screw member attached to the valve main body, a motor having a rotator and stator, and a valve shaft. The valve shaft is screwed to a female screw of the female screw member, and is rotated and driven by the rotor, and has a fully opening movable stopper capable of contacting the fully opening fixing stopper.

Abstract: To provide a small motor-operated valve which can control a high flow, there is provided a motor-operated valve of which a body has an orifice, seat and a valve element provided opposite to the seat. The valve element is operated by a driver which is driven to rotate by an output gear to which the rotation of a rotor having been reduced by means of a mechanical paradox planetary gear mechanism is transmitted. To force the valve element in the direction in which the valve is opened, a coil spring is disposed in a bore formed in the upper portion of the body oppositely to a bush.

Abstract: The invention prevents a pressure receiving space of a pressure sensor from being electrically charged. In a pressure sensor, a diaphragm is attached to a base which is fixed within a cover and a pressure receiving space in which an oil is sealed is formed. A semiconductor type pressure detecting device is connected to a plurality of terminal pins by a bonding wire. A neutralization plate attached to a periphery of the semiconductor type pressure detecting device or a part of the periphery thereof is connected to an earth terminal pin by an earth bonding wire, or is connected to the earth terminal pin by a soldering so as to prevent an insulative medium sealed within the pressure receiving space from being electrically charged.

Abstract: [Problems to be solved] To provide a solenoid valve control device in which a user, or the like, can preciously grasp a state of the solenoid valve based on the number of operations of the solenoid valve. [Solution] The solenoid valve control device 13 controls the solenoid valve 12 and includes a storage unit 136 storing the number of operations concerning opening/closing of the solenoid valve 12, and a transmission unit 132 externally transmitting the number of operations stored in the storage unit 136. When the number of operations stored in the storage unit 136 becomes equal to or greater than the limitation number of times concerning a life of the solenoid valve 12, the transmission unit 132 externally transmits an alarm signal.

Abstract: A multi-way reversing valve includes a valve housing having a valve seat part in which a plurality of fluid in/out ports are formed; a valve member adapted to be rotated; and an actuator adapted to rotationally actuate the valve member. A fluid inlet port and/or a fluid outlet port is/are formed in the valve housing. A passage adapted to selectively place the fluid inlet port or the fluid outlet port in communication with the plurality of fluid in/out ports is formed within the valve member. Flow paths are reversed by rotating the valve member to selectively place the fluid inlet port or the fluid outlet port in communication with one of the plurality of in/out ports via the passage. The rotational axis line of the valve member is laterally eccentric relative to the rotational axis line of an output shaft of the actuator by a predetermined distance.