Abstract: The present invention is an exhaust gas recirculation (EGR) valve for an engine having an exhaust gas recirculation cooler operable for receiving exhaust gas from an exhaust, and delivering the exhaust gas to an intake. The present invention also includes an exhaust gas recirculation bypass passage operable for receiving exhaust gas from an exhaust, bypassing the exhaust gas recirculation cooler, and delivering the exhaust gas to an intake, as well as a single valve operably associated with the exhaust gas recirculation cooler and the exhaust gas recirculation bypass passage. The single valve is selectively operable for opening or closing flow from the exhaust to the exhaust gas recirculation cooler, the exhaust gas recirculation bypass passage, or both, the single valve also operable for metering flow therebetween.

Abstract: An intake apparatus for an internal combustion engine comprises an intake manifold (1); a rotary valve (10) including a plurality of valve portions (11) in communication with air feeding passages (3) through feed switch openings (7); a sealing member (60) fitted to the valve portion, the sealing member including ring portions (61) and interconnecting portions interconnecting the ring portions, recessed portions (76) defined on an outer side of the valve portions for receiving engaging portions (64) on inner sides of the interconnecting portions of the sealing members, wherein a distance (D1a) from a central portion of an outer peripheral edge (20a) of the closed area portion (20) to the rotational axis (P) is set smaller than a distance (D2) from a second central portion (43) of an outer peripheral edge (40a) of the open area portion (40) to the rotational axis.

Abstract: The present invention is related to a method for the production of a throttle valve connection piece housing and a throttle valve as molded injection parts. The throttle valve connection piece housing is provided with a throughflow opening which can be sealed by the throttle valve. Along a pivoting axis extending perpendicular to the longitudinal axis of the throughflow opening, the throttle valve is provided with a continuous shaft hole into which a throttle valve shaft can be inserted in a rotationally fixed manner, the two ends of the shaft protruding from the shaft hole in such a way that they protrude into coaxial bearing holes in the throttle valve connector piece housing which are coaxial to the shaft hole. When the throttle valve is in a closed position, the radial peripheral edge thereof rests on the inner wall of the throughflow opening. The throttle valve connector piece housing is produced together with the closed-position throttle valve as a single injection molded piece in an injection mold.

Abstract: A throttle device for controlling an internal combustion engine, in which the throttle valve is supported precisely employs a bearing recess serving to support the throttle valve shaft which is surrounded by a clamping element. As a result, there is excellent, durable stabilization of the bearing recess. The throttle device is especially well suited to vehicles that have a throttle-type internal combustion engine.

Abstract: A method for rebuilding a flow control valve, may be performed by first providing a flow control valve having a rotor positioned in a chamber of a valve body. The rotor has a valve stem. A top cover plate is mounted to the valve body above the rotor and has a first bore through which the valve stem protrudes. The top cover plate is removed so the rotor can be removed from the valve body. A seal is positioned on the top cover plate along the first bore so that when the rotor and top cover plate are placed in or on the valve body, the flow control valve is sealed at the interface between the top cover plate and the valve stem.

Abstract: An exhaust valve assembly includes a valve body, a valve supported by a shaft within the valve body, and an actuator that drives the shaft to move the valve relative to the valve body. A side load feature engages one portion of the shaft to reduce valve chatter by side loading the shaft.

Abstract: A carburettor for a two-stroke engine includes a substantially circular section flow duct comprising rich (42) and lean (44) flow passages in parallel, through which, in use, air flows in a flow direction and which are separated by a substantially planar partition (66). At least one fuel jet (60, 61, 62) communicates with the rich passage (42) and the partition (66) includes an aperture (68) towards which the fuel jet is directed. A substantially planar butterfly valve (20) is received in the aperture (68) so as to be pivotable between a first position, in which the flow duct is substantially closed, and a second position, in which the flow duct is substantially open. The butterfly valve (20) is carried by a pivotal shaft (2) mounted to pivot about an axis which extends through the flow duct substantially diametrically.

Abstract: An exhaust valve assembly includes a valve body, a valve supported by a shaft within the valve body, and an actuator that moves the valve relative to the valve body to control exhaust flow. The actuator is thermally isolated from the valve by a linkage mechanism that cooperates with exhaust flow to move the valve between open and closed positions. The actuator temporarily contacts the linkage mechanism to initiate opening and closing movement but then moves out of contact with the linkage mechanism as the exhaust flow exerts a force against the valve to move the valve to a fully open or fully closed position. This temporary contact between the linkage mechanism and the actuator reduces heat transfer from the valve to the actuator.

Abstract: The present invention relates to a control valve (1) for controlling a gas flow in a gas line (3) of an internal combustion engine, in particular in a motor vehicle, comprising a rotationally adjustable flap (4) for controlling a flow cross section (13), a throttling sealing gap (14) which, in a closed position of the flap (4), is formed radially between a sealing contour (15) of the flap (4) and a sealing face (16) which faces the flap (4), and a drive shaft (5), on which the flap (4) is arranged fixedly in terms of rotation.

Abstract: An outflow valve is disclosed for use in a pressure vessel. The outflow valve includes a dual wall valve housing having a central bore, a butterfly plate assembly and an angled drive shaft. The butterfly plate assembly is designed to fit and rotate within the central bore. The angled drive shaft has first and second ends rotateably coupled to the dual wall valve housing, and the angled drive shaft is attached to the butterfly plate. The drive shaft is designed to rotate the butterfly plate assembly between a closed position and an open position within the central bore.

Abstract: The invention relates to a shut-off device for low-temperature media, with a housing (2), a valve seat (5) located in the housing (2), and a butterfly valve (3) that triggers the valve seat and that is pivotally supported in the housing (2), on the housing (2) at least one flange (10) being formed for mounting the shut-off device in a pipeline. The object of making available a low-temperature shut-off device at low construction cost and maintenance cost is achieved according to the invention in that the flange (10) of the housing (2) is designed as a welding flange (10a, 10b) for attachment of the shut-off device (1) in the pipeline by means of a weld joint, especially a butt weld joint, and the housing (2) is provided with a housing opening (11) for mounting and/or removing the butterfly valve (3).

Abstract: An actuator assembly including an actuator housing assembly having a linear drive mechanism disposed at least partially therein. A linear variable differential transducer (LVDT) is coupled to the linear drive mechanism and configured to eliminate rotation of the linear drive mechanism and provide linear positioning of the linear drive mechanism. A valve shaft is coupled to the linear drive mechanism and in substantially linear alignment with the linear drive mechanism. A rotational coupler, in the form of a helical groove and reciprocating guide member, is formed to couple the linear drive mechanism to the valve shaft. The valve shaft is configured to allow for the linear displacement therein of the linear drive mechanism and thereby output a rotation moment via the rotational coupler to the valve shaft.

Abstract: A valve assembly comprises a rotatable valve, an electrically operated actuator, and an overstroke device. The actuator comprises a component configured to move in a direction to an actuator position so as to cause corresponding rotation of the valve to a valve position in response to electrical operation of the actuator. The overstroke device is configured to enable the component to move in the direction beyond the actuator position to an overstroke position while the valve remains in the valve position in response to electrical operation of the actuator.

Abstract: A triple offset butterfly valve includes a valve body defining a valve orifice and a valve member rotatably mounted in the valve orifice. The valve member includes a disc element detachably mounted to a mounting plate; the valve member being mounted to a rotatable axle which extends between the disc element and mounting plane thereof. The valve body has an annular valve seat against which the disc element of the valve member seals when the valve is closed. In use, when the valve components become worn, the disc element of the valve member can easily be removed as a complete unit and replaced. In this manner, the need for a removable seal on the valve member is avoided, which reduces the number of potential leak paths as compared to known butterfly valves.

Abstract: A throttle valve set for controlling an amount of intake air includes a shaft, a first valve plate connected to a first side of the shaft and rotating along with the shaft, a supporting plate connected to a second side of the shaft and rotating along with the shaft and the first valve plate, and a second valve plate at the second side of the shaft and rotatable with respect to the shaft. The supporting plate pushes the second valve plate such that the second valve plate rotates along with the shaft, the first valve plate, and the supporting plate if the supporting plate has rotated more than a certain amount. The valve plates may be semicircular, and the shaft may be disposed along the diameter of the circle. The second valve plate may have a depression configured for the supporting plate to be inserted therein.

Abstract: A valve assembly has a valve housing, an inlet, an outlet and a flow passage extending between the inlet and the outlet. A shut-off valve is mounted on the housing adjacent the inlet and a flow control valve is mounted on the housing adjacent the outlet. By mounting both valves on the same housing, the dimensions of the assembly are reduced.

Abstract: A device is provided for producing and/or augmenting a partial vacuum in a motor vehicle, in particular for operating a partial vacuum brake servo-unit. The device includes, but is not limited to a throttle unit, which has at least one throttle valve housing and a throttle valve which is arranged so as to be rotatable in an angle range in a throttle channel in the throttle valve housing for controlling a fluid flow in the throttle channel. The device also includes, but is not limited to means for producing and/or augmenting partial vacuum, the means being configured as partial vacuum augmentation means integrated into the throttle valve housing, which partial vacuum augmentation means act according to Bernoulli's principle in the manner of a sucking jet pump to produce an augmented partial vacuum for at least one brake servo-unit.

Abstract: A VAV box includes a housing formed by a top wall, a bottom wall, and a pair of vertical side walls. A blade is mounted for rotation about a vertical axis within an air flow passageway defined by a hollow interior of the housing. A first protuberance formed on an interior side of the first side wall has a leading wall swept back relative to an entrance to the box, a trailing wall swept forward relative to the entrance, and a concave wall that interconnects the innermost ends of the leading and trailing walls. A second protuberance having the same structure is formed on an interior side of the second side wall. The protuberances produce a linear response in air flow to changes in blade position, eliminating the non-linear response of prior art VAV boxes.

Abstract: Improvements in present day fire hydrants are presented. The improvement relates to a fire hydrant where the above ground structure is essentially removed and is replaced with an adaptable connection. The connection uses the same mounting hole pattern as used in the above ground hydrant. In operation, the adaptable connection is protected by a hinged cover that is opened to provide access to the adaptable connection. The adaptable connection includes a bayonet type connection where a portable fire hydrant is secured and rotated to start the flow of water. The adaptable fire connection eliminates the appearance of the fire hydrant, the potential of a vehicle hitting a fire hydrant and the material cost associated with above ground fire hydrants.

Abstract: A flap valve for a motor vehicle exhaust system includes a valve housing in which a valve flap is pivotally mounted about a shaft. A bearing housing is disposed in a gas-tight manner outside the valve housing. The shaft is extended through a first orifice in the valve housing and emerges from the bearing housing through a second orifice. Inside the bearing housing, the shaft is surrounded by a bearing ring having a supporting surface pointing towards the valve flap. A spring element, which is mounted in the bearing housing, surrounds the shaft and is supported at the supporting surface and directly or indirectly at the shaft.

Abstract: A throttle valve assembly is held within a passageway in a throttle body. The assembly includes a plate and a pivot shaft. The pivot shaft extends through the mounting receptacle and engages with the throttle body. A method of making a series of throttle bodies includes molding multiple like bodies having first and second passageway portions. The first portions are sized to receive butterfly valves of a standard size. The second portions, positioned downstream from the first portions, have cross sectional openings equal to or smaller than the first portions. The second portions are machined or molded to various sizes adapted to flow fluid into the in-take ports of various size engines.

Abstract: A relatively compact, lightweight outflow valve assembly includes suitable redundancy features that allow the valve assembly to meet regulatory requirements for certain postulated single point failures. The valve assembly includes a valve body that is constructed at least partially of a non-metallic material and has an outer surface and an inner surface that defines a flow passage having at least two flow ports. A sleeve is disposed within the valve body flow passage that is constructed at least partially of a metallic material. The sleeve has a flow passage formed therein that is in fluid communication with the valve body flow passage flow ports. A valve element is disposed within the sleeve flow passage and is moveable between at least an open position and a closed position. A plurality of brackets is mounted on the valve body outer surface and is coupled to the sleeve. When the valve assembly is installed in an aircraft, the plurality of brackets further couples the sleeve to the aircraft fuselage.

Abstract: A fluid control valve assembly is disclosed that includes a housing, a valve with a ring-shaped groove, and a seal ring with a clearance extending between an outer diameter and an inner diameter. The seal ring includes a pair of opposing axial side surfaces and is provided in the groove. The seal ring seals against the housing when the valve is in the closed position. The valve assembly also includes a backup ring provided in the groove adjacent one of the axial side surfaces of the seal ring to thereby obstruct fluid flow through the clearance of the seal ring when the valve is in the closed position.

Abstract: A control valve is disclosed having a passage formed therein defined by an inner surface, the control valve includes at least one enhanced surface, a liner, or a combination thereof to militate against ice formation thereon and adhesion of the ice thereto.

Abstract: A motor is properly aligned with a throttle valve and vibration resistance of the motor is improved. In a throttle device having a motor for driving a throttle valve, the motor is inserted into a motor casing provided in a throttle body. A portion on the output-shaft side of the motor is held in its radial direction in the vicinity of the motor-insertion opening of the motor casing. A portion opposite to the output-shaft side of the motor is provided with elastic pieces or elastic projections. The motor and the elastic pieces or elastic projections are formed in a single piece, or the elastic pieces or elastic projections are attached to the motor. The elastic pieces or elastic projections are deformed inwardly of the radial direction of the motor so that the portion opposite to the output-shaft side of the motor is supported in its radial direction in the motor casing.

Abstract: Butterfly valves are provided that include a flowbody, a butterfly plate, and a coating. The flowbody has an inner surface defining a channel. The butterfly plate is disposed in the channel, is rotationally mounted to the flowbody, and has an outer periphery. The coating is disposed on at least a portion of at least one of the flowbody inner surface and the butterfly plate outer periphery and is made of a material formulated to abrade upon friction contact with an adjacent surface and to maintain structural integrity when subjected to pneumatic forces of at least 600 psi.

Abstract: An intake air control valve has a bore defining member and a butterfly-type valve member that includes a shaft and a valve body. The valve body has a pair of valve portions joined to the shaft and rotatable between a fully closed position and a fully opened position; Each of the valve portions has a central portion and opposite end portions along a direction of the rotational axis of the valve member. The thickness of each of the valve portions gradually increases from the central portion toward the end portions.

Abstract: A valve has a body, a fluid inlet duct delimited by the body, two fluid outlet ducts into which the fluid inlet duct opens, an intersection formed by the two fluid outlet ducts, a butterfly valve disposed in the intersection, and a motor, to which the butterfly valve is connected, for actuating the butterfly valve between a first extreme position in which the butterfly valve directs the fluid mainly toward the first outlet duct and a second extreme position in which the butterfly valve directs the fluid mainly toward the second outlet duct. The motor is placed between the outlet ducts in the vicinity of a connecting zone connecting the two outlet ducts to one another. The butterfly valve is mounted in front of the connecting zone so that the butterfly valve forms a screen against the fluid for the connecting zone.

Abstract: An intake apparatus 100 includes a bore 102 and a throttle valve 104. A coating film 110 in which a lipophilic component and an oil-repellent component are dispersed is formed on at least one of an outer peripheral end surface 104a of the throttle valve 104 and a facing surface 102a of the bore 102 which faces the throttle valve 104.

Abstract: A throttle body for an air intake system of an internal combustion engine, which includes a combustion chamber. The throttle body includes a body, a throttle plate and a coating. The body defines a throat through which air flows to the combustion chamber. The throttle plate, which is pivotally mounted with respect to the body, moves between first and second configurations with respect to the throat. The first configuration of the throttle plate substantially prohibits the air flow through the throat, and the second configuration of the throttle plate permits air flow through the throat. The coating, which is on at least one of the throat and the throttle plate, sheds contaminants that extend between the body and the throttle plate in the first configuration of the throttle plate.

Abstract: A valve system having high maximum gas flow rate and fine control of gas flow rate, includes a valve housing for blocking gas flow through a gas flow path, a large area opening through said housing having a first arcuate side wall and a small area opening through said housing having a second arcuate side wall, and respective large area and small area rotatable valve flaps in said large area and small area openings, respectively, and having arcuate edges congruent with said first and second arcuate side walls, respectively and defining therebetween respective first and second valve gaps. The first and second valve gaps are sufficiently small to block flow of a gas on one side of said valve housing up to a predetermined pressure limit, thereby obviating any need for O-rings.

Abstract: In an electronically controlled throttle valve system, a case of a DC motor and a valve housing forming a throttle body are mutually different in material and shape. Specifically, the valve housing is made of synthetic resin easy to be deformed and the case is made of metal hard to be deformed as compared with synthetic resin. An elastic body formed of a nearly annular metal plate spring is mounted between the DC motor and the valve housing. The elastic body includes a plate spring base part having a larger contact area with respect to a contacted portion and a plurality of tabs having a smaller contact area with respect to the contacted portion. The plate spring base part is in contact with the valve housing made of synthetic resin and each tab is in contact with the metal case.

Abstract: To stably maintain an opening degree characteristic of a driven lever, the driven lever (5) is attached to one end (3A) of a main throttle shaft (3) to which a main throttle valve (4) is attached, a cam lever (10) is attached to one end (8A) of a sub throttle shaft (8) to which a sub throttle valve (9) is attached, a cam surface (10A) of the cam lever (10) faces to a roller (5A) of the driven lever (5), a cup-shaped throttle cover (12) is arranged on one side wall (1A) of a throttle body (1), an opening portion (12C) of a throttle cover (12) is closed by a closing cover (20), and a lever storage chamber (22) formed by the throttle cover (12) and the closing cover (20) accommodates the cam lever (10) and the driven lever (5).

Abstract: A butterfly valve comprising a valve body having a passage, a valve shaft assembly, a plate, and a tube is provided. The valve shaft assembly comprises first and second shaft portions in opposing spaced relation, an intermediate portion therebetween, and a support plate secured to the valve shaft assembly. The first and second shaft portions rotatably couple the valve shaft assembly to the valve body. The intermediate member forms a chamber in fluidic communication with the passage. The support plate is disposed within the chamber at a closed valve position approximately perpendicular to a direction of fluid flow through the passage. The plate is secured to the support plate and has an inner portion and a flange radially outward of the inner portion. The flange is directed away from the support plate. The tube is disposed within the passage and friction or clearance fit over a portion of the flange.

Abstract: An intake structure for internal combustion engine includes an intake passage which is communicated with a combustion chamber of the internal combustion engine and through which air to be supplied to the combustion chamber flows; and a valve which is provided in the intake passage and which controls the airflow in the intake passage. The intake passage has a recess which is formed in the inner wall face of the intake passage and in which the valve is arranged; and a groove that is connected to the recess, at a substantially center position of the recess in a width direction of the recess, and that extends from the recess toward the downstream side of the intake passage.

Abstract: A valve actuator is disclosed for use with short throw valves. The actuator includes a plate perpendicular to the valve stem that has a slot formed of regions having different radii of curvature centered on the valve stem. An eccentric cam is attached to a handle mounted on the valve stem. The cam extends through the slot and is rotatable for positioning at a radius corresponding to the radius of the different slot regions. When the cam is rotated so that it may traverse a slot region, the handle can be turned to move the valve closing member through an angle subtended by the slot region. This permits the valve to be opened or closed in a step-wise fashion and prevents rapid opening and closing of the valve that can cause a water hammer effect.

Abstract: A method of pressure balancing across a bearing adjacent to a pressure differential is described. The method primarily includes providing a bypass port around the bearing for allowing a fluid flow from a first pressure side to a second pressure side. A throttle body for an engine is also described. The throttle body primarily includes: (1) a bearing cooperating with the valve body; and (2) a bypass port around the bearing for allowing the fluid flow from a first pressure side to a second pressure side.

Abstract: A butterfly valve of a swirl system for an internal combustion engine; the butterfly valve displays: a shaft which is rotationally mounted within an intake channel to rotate about a rotation axis; and a butterfly valve plate which is rigidly connected to the shaft and is provided with a seat, which is coaxially arranged with respect to the shaft and accommodates the shaft within itself.

Abstract: A butterfly-type valve for controlling toner material flow to a toner container, including, a valve plate which is pivotally disposed in an elongate flow path defined by a passage way, wherein the valve plate is pivotal from a closed position which substantially closes a fluid communication along the path to an open position which maximally permitting fluid communication along the path, a gap area defined between the valve plate and the passage way when the valve plate is in the closed position which allows minimum toner material flow therethrough without compressing the toner material, and a pump for supplying air to the gap area when the valve plate is in the closed position to stop the minimum toner material flow.

Abstract: There is provided a shaft-member holding construction which allows easy attachment of a shaft member. The construction includes a shaft member 4 supporting a rotary member 2, a bearing 5 for rotatably holding the shaft member 4, and a bearing holding member 31, 32 having an opening 31a, 32a capable of receiving the bearing 5 along an axial direction of the shaft member 4. The bearing holding member 31, 32 has a gap 31b, 32b capable of receiving the shaft member 4 from a radial direction relative to the axial direction.

Abstract: An exhaust throttling valve (12) is provided for a vehicle. The valve includes a body structure (16, 41) having a bore (46) there-through. A shaft (28) is supported by the body structure for rotational movement. A valve member (34) is associated with the shaft such rotational movement of the shaft rotates the valve member. The valve member is disposed in the bore and is constructed and arranged to rotate between a first position substantially closing the bore and a second position at least partly opening the bore. A hard stop (56) is associated with the shaft so as to rotate therewith. First and second adjustment structures (52, 54) are constructed and arranged so that upon rotation of the shaft in one direction, the hard stop engages the first adjustment structure and upon rotation of the shaft in a direction opposite the one direction, the hard stop engages the second adjustment structure, thus limiting travel of the valve member.

Abstract: A valve regulating device intended to regulate the circulation of a fluid in the region of an opening, said device consisting of a pivoting valve body, of an annular support body integrating two opposing bearings mounting said valve body in a rotational manner, and of a control pin, wherein said valve body may be displaced in rotation between a totally open position and a closed position, in which it rests against the annular seat provided by the support body; the support body is provided with a seal with a first extending functional segment and a second extending functional segment having protruding lateral extensions, for example in the form of ribs, on the face of the support body that bears against the edge of the opening, said extensions also being interconnected by intermediate joining portions, which also extend in a protruding manner over the bodies of the two opposing bearings so as to provide a continuous peripheral seal around the opening when the regulating device is mounted on said opening.

Abstract: A valve actuator is disclosed for use with short throw valves. The actuator includes a plate perpendicular to the valve stem that has a slot formed of regions having different radii of curvature centered on the valve stem. An eccentric cam is attached to a handle mounted on the valve stem. The cam extends through the slot and is rotatable for positioning at a radius corresponding to the radius of the different slot regions. When the cam is rotated so that it may traverse a slot region, the handle can be turned to move the valve closing member through an angle subtended by the slot region. This permits the valve to be opened or closed in a step-wise fashion and prevents rapid opening and closing of the valve that can cause a water hammer effect.

Abstract: An intake device has an intake manifold, valve units each having a valve housing and a valve member, a shaft and deformed members. The intake manifold defines passages through which a fluid flows. Each of the valve units is disposed in a corresponding one of the passages of the intake manifold such that a passage of the valve unit is in communication with the passage of the intake manifold. The shaft passes through the intake manifold and the valve units, and rotatably supports the valve members. Further, each of the deformed members is disposed between the valve housing and the intake manifold and deformed therebetween.

Abstract: A method for rebuilding a flow control valve, may be performed by first providing a flow control valve having a rotor positioned in a chamber of a valve body. The rotor has a valve stem. A top cover plate is mounted to the valve body above the rotor and has a first bore through which the valve stem protrudes. The top cover plate is removed so the rotor can be removed from the valve body. A seal is positioned on the top cover plate along the first bore so that when the rotor and top cover plate are placed in or on the valve body, the flow control valve is sealed at the interface between the top cover plate and the valve stem.

Abstract: A method of pressure balancing across a bearing adjacent to a pressure differential is described. The method primarily includes providing a bypass port around the bearing for allowing a fluid flow from a first pressure side to a second pressure side. A throttle body for an engine is also described. The throttle body primarily includes: (1) a bearing cooperating with the valve body; and (2) a bypass port around the bearing for allowing the fluid flow from a first pressure side to a second pressure side.

Abstract: An outflow valve includes a valve closure mechanism that automatically closes the outflow valve in the unlikely event the outflow valve actuator becomes inoperable. The valve closure mechanism includes a pulley, a load plate, a cable, and a spring. The pulley is coupled to a valve element is the outflow valve and is configured to eccentrically rotate therewith. The cable has a first end coupled to the pulley, and a second end coupled to the load plate. The spring is disposed between the valve and the load plate and surrounds a portion of the cable. The spring is configured to supply a bias force, via the load plate and the cable, to the pulley that biases the valve element toward the closed position.

Abstract: A lightweight, low cost throttle body and throttle valve placed in the body, both formed of resins, that resolve the problem of excessively large gap formation is disclosed. Circumferentially oriented filler contained in a resin forming a throttle valve compensates to make the radial linear expansion coefficient of the throttle valve substantially equal to that of a bore. Grooves are formed on concentric circles in the throttle valve to orient filler circumferentially. A throttle valve provided with circumferentially oriented filler can be formed by impregnating an aggregate formed by circumferentially arranging the filler with a resin and curing the resin. A rib is formed in a part near a throttle shaft to control molding shrinkage so that the roundness of the bore is small.

Abstract: A butterfly valve apparatus includes a valve body, valve discs, valve shafts, and a connecting member. The valve body has valve passages. Valve discs are respectively arranged in the valve passages. Valve shafts are supported by the valve body such that the valve shafts are aligned substantially in the axial direction of the valve shafts. The plurality of valve shafts respectively support the valve discs. The connecting member connects the valve shafts, which are adjacent to each other. The valve shafts are formed of metal. The connecting member is formed of resin. The valve shafts, which are adjacent to each other, form a gap therebetween in the axial direction of the valve shafts. The valve shafts are connected by forming the connecting member.

Abstract: A throttle control apparatus includes a housing defining therein a fluid passage. A motor is provided for generating driving force to rotate a valve. The valve blocks the fluid passage when the valve is in a full close position. A throttle position detecting unit detects a throttle position of the valve. A control unit is adapted to performing a full close control to manipulate the valve toward a control target by setting the control target at a throttle position deviating from the full close position in a close rotative direction. The control unit starts a deceleration control to reduce moving speed of the valve gradually toward the control target in the full close control when the throttle position is a specific position in the vicinity of the full close position.