Abstract: Provided is a valve body that changes a communication state of a flow path through which liquid flows, the valve body comprising a valve main body formed of synthetic resin and comprising inside a press-fit fixing cylinder made of metal, and a drive shaft that is press-fitted in and fixed to the press-fit fixing cylinder of the valve main body. A non-press-fit portion comprising a space in a predetermined shape is formed in either one of the press-fit fixing cylinder and the drive shaft or both the press-fit fixing cylinder and the drive shaft. If the press-fit fixing cylinder is deformed to be expanded due to the press-fitting of the drive shaft, the deformation can be absorbed by the non-press-fit portion. This makes it possible to restrain a split or crack from being generated in the synthetic resin that forms the valve main body which is located around the press-fit fixing cylinder in which the drive shaft is press-fitted.

Abstract: To provide an exhaust gas recirculation (EGR) system for an engine capable of improving engine performance while avoiding misfire, an EGR passage and an EGR valve that opens/closes the EGR passage to change an EGR amount as an amount of EGR gas to be recirculated to an intake passage are provided. When an engine is being operated in an EGR region, EGR control is executed to recirculate the EGR gas by opening the EGR valve. In addition, in the case where an intake air temperature detected by an intake air temperature sensor is lower than a predetermined first set temperature, the EGR control is prohibited even when the engine is being operated in the EGR region under a condition that an intake air flow rate as a flow rate of intake air flowing through the intake passage is lower than a predetermined set flow rate.

Abstract: Provided is a valve body that changes a communication state of a flow path through which liquid flows, the valve body comprising a valve main body formed of synthetic resin and comprising inside a press-fit fixing cylinder made of metal, and a drive shaft that is press-fitted in and fixed to the press-fit fixing cylinder of the valve main body. A non-press-fit portion comprising a space in a predetermined shape is formed in either one of the press-fit fixing cylinder and the drive shaft or both the press-fit fixing cylinder and the drive shaft. If the press-fit fixing cylinder is deformed to be expanded due to the press-fitting of the drive shaft, the deformation can be absorbed by the non-press-fit portion. This makes it possible to restrain a split or crack from being generated in the synthetic resin that forms the valve main body which is located around the press-fit fixing cylinder in which the drive shaft is press-fitted.

Abstract: To provide a fine nickel powder for an internal electrode paste of an electronic component, the nickel powder obtained by a wet method and having high crystallinity, excellent sintering characteristics, and heat-shrinking characteristics. The nickel powder is obtained by precipitating nickel by a reduction reaction in a reaction solution including at least water-soluble nickel salt, salt of metal nobler than nickel, hydrazine as a reducing agent, and alkali metal hydroxide as a pH adjusting agent and water; the reaction solution is prepared by mixing a nickel salt solution including the water-soluble nickel salt and the salt of metal nobler than nickel with a mixed reducing agent solution including hydrazine and alkali metal hydroxide; and the hydrazine is additionally added to the reaction solution after a reduction reaction initiates in the reaction solution.

Abstract: A control valve includes: a second inner circumferential portion capable of holding a first spring, in a first communication passage provided at a first discharge opening of a housing; and a recessed portion recessed in a radial direction, at a position that is a part of a region in a circumferential direction of the second circumferential portion and overlaps a second communication passage opening in a biasing direction of the first spring. Therefore, when inserting the first spring into the first communication passage, it is possible to hold the first spring with the inner circumferential surface of the second inner circumferential portion. Consequently, the first spring is appropriately mounted in the second circumferential portion, thereby preventing a mounting defect of the first spring.

Abstract: A control valve according to the present invention is configured such that when a third opening part, which is an auxiliary opening part, and a third discharge opening, which is an auxiliary connection opening, do not overlap, the third opening part and a continuous discharge opening overlap. Thus, for example, when a flow rate of cooling water for continuous circulation is required, such as during a cold start, cooling water guided through an internal passage is discharged via the continuous discharge opening in addition to cooling water guided from a bypass passage, thereby ensuring a sufficient flow rate of cooling water for continuous circulation.

Abstract: A control valve includes: a second inner circumferential portion capable of holding a first spring, in a first communication passage provided at a first discharge opening of a housing; and a recessed portion recessed in a radial direction, at a position that is a part of a region in a circumferential direction of the second circumferential portion and overlaps a second communication passage opening in a biasing direction of the first spring. Therefore, when inserting the first spring into the first communication passage, it is possible to hold the first spring with the inner circumferential surface of the second inner circumferential portion. Consequently, the first spring is appropriately mounted in the second circumferential portion, thereby preventing a mounting defect of the first spring.

Abstract: To provide a fine nickel powder for an internal electrode paste of an electronic component, the nickel powder obtained by a wet method and having high crystallinity, excellent sintering characteristics, and heat-shrinking characteristics. The nickel powder is obtained by precipitating nickel by a reduction reaction in a reaction solution including at least water-soluble nickel salt, salt of metal nobler than nickel, hydrazine as a reducing agent, and alkali metal hydroxide as a pH adjusting agent and water; the reaction solution is prepared by mixing a nickel salt solution including the water-soluble nickel salt and the salt of metal nobler than nickel with a mixed reducing agent solution including hydrazine and alkali metal hydroxide; and the hydrazine is additionally added to the reaction solution after a reduction reaction initiates in the reaction solution.

Abstract: To provide a fine nickel powder for an internal electrode paste of an electronic component, the nickel powder obtained by a wet method and having high crystallinity, excellent sintering characteristics, and heat-shrinking characteristics. The nickel powder is obtained by precipitating nickel by a reduction reaction in a reaction solution including at least water-soluble nickel salt, salt of metal nobler than nickel, hydrazine as a reducing agent, and alkali metal hydroxide as a pH adjusting agent and water; the reaction solution is prepared by mixing a nickel salt solution including the water-soluble nickel salt and the salt of metal nobler than nickel with a mixed reducing agent solution including hydrazine and alkali metal hydroxide; and the hydrazine is additionally added to the reaction solution after a reduction reaction initiates in the reaction solution.

Abstract: Provided is a flow control valve and a cooling system, with which a pressure loss can be reduced. A rotor 12 includes a first guide portion 43 on the outer circumferential side of an extending portion 42 fixed to a drive shaft 13 and protruding into a space inside the rotor 12. The first guide portion 43 has a radial outer shape which increases from an x-axis positive direction side toward an x-axis negative direction side.

Abstract: A control valve according to the present invention is configured such that when a third opening part, which is an auxiliary opening part, and a third discharge opening, which is an auxiliary connection opening, do not overlap, the third opening part and a continuous discharge opening overlap. Thus, for example, when a flow rate of cooling water for continuous circulation is required, such as during a cold start, cooling water guided through an internal passage is discharged via the continuous discharge opening in addition to cooling water guided from a bypass passage, thereby ensuring a sufficient flow rate of cooling water for continuous circulation.

Abstract: A rotary control valve includes: a rotor including a tubular part and an opening in the tubular part; a seal member including a contact face, an internal passage, a noncontact part, and a ridge; a biasing member structured to cause the contact face of the seal member to be pressed on the tubular part; and a drive mechanism structured to rotate the rotor. The contact face is structured to be in sliding contact with the tubular part, and has an arc-curved surface shaped to fit with an outer periphery of the tubular part. The internal passage is structured to communicate with the opening of the tubular part. The noncontact part is formed at least one of ends of the arc-curved surface in a rotational direction of the tubular part, and is structured to be out of contact with the tubular part so as to define the ridge.

Abstract: Provided is a flow control valve and a cooling system, with which a pressure loss can be reduced. A rotor 12 includes a first guide portion 43 on the outer circumferential side of an extending portion 42 fixed to a drive shaft 13 and protruding into a space inside the rotor 12. The first guide portion 43 has a radial outer shape which increases from an x-axis positive direction side toward an x-axis negative direction side.

Abstract: Provided is a flow control valve and a cooling system, with which a pressure loss can be reduced. A rotor 12 includes a first guide portion 43 on the outer circumferential side of an extending portion 42 fixed to a drive shaft 13 and protruding into a space inside the rotor 12. The first guide portion 43 has a radial outer shape which increases from an x-axis positive direction side toward an x-axis negative direction side.

Abstract: In a flow rate control valve CV provided with seal members S1 to S3 arranged radially between a housing 1 and a valve body 3 rotatably supported in the housing 1, seal members which hermetically seals the space radially between the housing 1 and valve body 3 by sliding against the outer peripheral surface of valve body 3, concave level difference parts N1 and N2 recessed lower than seal-sliding contact surfaces which are the outer peripheral surfaces of the seal-sliding parts D1 to D3 are provided, and parting lines P1 and P2 are provided within the level difference parts N1 and N2, and thereby it is possible to suppress damage to seal surfaces S1a to S3a of the seal members S1 to S3 caused by sliding against the parting lines P1 and P2 when the seal surfaces S1a to S3a pass through the parting lines P1 and P2.

Abstract: A rotary control valve includes: a rotor including a tubular part and an opening in the tubular part; a seal member including a contact face, an internal passage, a noncontact part, and a ridge; a biasing member structured to cause the contact face of the seal member to be pressed on the tubular part; and a drive mechanism structured to rotate the rotor. The contact face is structured to be in sliding contact with the tubular part, and has an arc-curved surface shaped to fit with an outer periphery of the tubular part. The internal passage is structured to communicate with the opening of the tubular part. The noncontact part is formed at least one of ends of the arc-curved surface in a rotational direction of the tubular part, and is structured to be out of contact with the tubular part so as to define the ridge.

Abstract: A process for producing nickel powder capable of obtaining inexpensive, and also, high-performance nickel powder, even when using wet process. A process for producing nickel powder, including a crystallization step for obtaining nickel crystal powder by reductive reaction in reaction solution in which at least water-soluble nickel salt, metal salt of metal more noble than nickel, reducing agent, alkali hydroxide, amine compound, and water are mixed, wherein the reducing agent to be mixed in the crystallization step is hydrazine, the amine compound is autolysis inhibitor of hydrazine, and contains two or more primary amino groups in molecule, or contains one primary amino group and one or more secondary amino groups in molecule, and ratio of molar number of the amine compound with respect to molar number of nickel in the reaction solution is in a range of 0.01 mol % to 5 mol %.

Abstract: In a cooling control device CM that controls the cooling state of an external device by controlling the flow rate of cooling water that flows in from an introduction port 10 and causing the cooling water to flow out from a first to a third discharge ports E1 to E3, the cooling control device CM is configured that, for example, the flow rate of the cooling water to be supplied to a radiator side from the cooling control device CM is controlled by the cooperation of a flow rate control valve CV that controls the flow rate of the water supply according to a preset rule, and a switching control valve SV that controls the flow rate of the water supply independently from the flow rate control valve CV through a route different from that of the flow rate control valve CV.

Abstract: Provided is a flow control valve and a cooling system, with which a pressure loss can be reduced. A rotor 12 includes a first guide portion 43 on the outer circumferential side of an extending portion 42 fixed to a drive shaft 13 and protruding into a space inside the rotor 12. The first guide portion 43 has a radial outer shape which increases from an x-axis positive direction side toward an x-axis negative direction side.

Abstract: To provide a fine nickel powder for an internal electrode paste of an electronic component, the nickel powder obtained by a wet method and having high crystallinity, excellent sintering characteristics, and heat-shrinking characteristics. The nickel powder is obtained by precipitating nickel by a reduction reaction in a reaction solution including at least water-soluble nickel salt, salt of metal nobler than nickel, hydrazine as a reducing agent, and alkali metal hydroxide as a pH adjusting agent and water; the reaction solution is prepared by mixing a nickel salt solution including the water-soluble nickel salt and the salt of metal nobler than nickel with a mixed reducing agent solution including hydrazine and alkali metal hydroxide; and the hydrazine is additionally added to the reaction solution after a reduction reaction initiates in the reaction solution.