An exhaust-gas flap device, including for the exhaust-gas flow of an internal combustion engine, has a flap pipe and a flap plate that is supported in the interior of the flap pipe on a pivot shaft. The pivot shaft is rotatable about a pivot axis (A). The pivot shaft has first and second axial end regions and is supported rotatably on the flap pipe by respective first and second bearing assemblies. The pivot shaft is configured, in the first axial end region, for coupling to a drive element of a pivot drive. The pivot shaft is, in at least one of the axial end regions, in contact with vibration-damping material that is supported relative to the flap pipe.

A lined butterfly valve and manufacturing method, the lined butterfly valve including a valve disk (2) with a core metal (20) covered with a lining layer (22) provided rotatably inside a body (3) by a stem (5). The lining layer includes a front/back-side lining part (32) provided on each of front and back sides of the core metal and an outer circumferential lining part (33) provided on an outer circumferential side of the core metal. The front/back-side lining part is provided on each of the front and back sides of the core metal in which no occurrence of warpage is assumed so as to have a thickness T1, and the outer circumferential lining part has a thickness T2 from an outer circumferential end of the core metal to a tip seal surface of an outer circumferential end of the valve disk.

An EGR device has a housing defining an EGR passage through which an EGR gas flows; a shaft rotatably supported by the housing through a bearing; a valve body adjusting a flow passage area of the EGR passage by rotating along with the shaft; and an actuator connected to one end portion of the shaft to drive the shaft. The bearing has a first bearing supporting one end portion of the shaft and a second bearing supporting the other end portion of the shaft. Moreover, a sealing member preventing fluid from flowing into the actuator is disposed at one end portion of the shaft. The housing has the chamber which accommodates the second bearing and is isolated form the exterior. The second bearing is made of a PPS resin material to which a fluororesin material is added. Thus, the second bearing is not corroded even if exposed to an atmosphere of strong acid.

In this butterfly valve (10) provided with: a main body (11); valve shafts (13, 14); and a valve body (30) that is rotatable with respect to the main body, the valve body is formed integrally from a core material (32) and a contour forming member (31) that is formed from a synthetic resin material and that encircles the core material and forms the contour of the valve body. The valve body has bearing holes (33, 34) that support the valve shafts, the contour forming member has a bearing inner peripheral part (36) that forms at least a part of the inner peripheral surface of each of the bearing holes, the contour forming member is formed continuously with the bearing inner peripheral part, and the core material has a bearing reinforcing part (35) that supports the bearing inner peripheral part of the contour forming member, radially outside from the rotation axis of the valve body.

An exhaust valve comprises a tubular body extending along an axis, and defining a flow section perpendicular to the axis, a flap arranged in the tubular body across the flow section, and a shaft rigidly connected to the flap. The shaft is rotatable between a closed orientation in which the flap closes the flow section and an open orientation in which the flap frees the flow section. A proximal, respectively distal, housing is rigidly connected to the tubular body and houses a proximal, respectively distal, bearing ensuring a rotary interface between the tubular body and a proximal, respectively distal, end of the shaft. A rotary actuator is capable of moving the shaft alternately between the closed orientation and the open orientation, and is arranged outside the tubular body and rigidly connected to the proximal end of the shaft. The proximal and/or distal housing is separate from the tubular body.

A flap device for a motor vehicle comprises a flap housing that can be flowed through by a gas flow; and a flap shaft that is rotatably supported about an axis of rotation in the flap housing by means of at least a first and a second bearing element, which are held at the flap housing, and that carries a flap for selectively blocking or throttling the gas flow. The flap shaft is supported at the first bearing element in a first axial direction via a fixed abutment element that is axially fixedly arranged with respect to the flap shaft. The flap shaft is supported at the second bearing element in a second axial direction, which is oriented opposite the first axial direction, via a movable abutment element that is axially displaceably seated on the flap shaft, with the movable abutment element being preloaded in a direction toward the second bearing element by means of a spring device, and with the spring device in this respect being supported at a support surface fixed to the shaft and thus pressing the fixed abutment element against the first bearing element.

A throttle valve device includes a shaft in a cylindrical passage, a slit passing through the shaft from one lateral side to another lateral side of the shaft, a pair of bearings on both sides of the cylindrical passage and rotatably supporting one end part and another end part of the shaft, and a circular-plate valve inserted into the slit of the shaft and rotatable to open and close the cylindrical passage. A length of the slit on the one lateral side of the shaft is, in an axial direction of the shaft, longer than a length of the slit on the other lateral side of the shaft. A round end hole is formed at an end of the slit in the one end part of the shaft on the one lateral side of the shaft.

A throttle valve device includes a shaft in a cylindrical passage, a slit passing through the shaft from one lateral side to another lateral side of the shaft, a pair of bearings on both sides of the cylindrical passage and rotatably supporting one end part and another end part of the shaft, and a circular-plate valve inserted into the slit of the shaft and rotatable to open and close the cylindrical passage. A length of the slit on the one lateral side of the shaft is, in an axial direction of the shaft, longer than a length of the slit on the other lateral side of the shaft. A round end hole is formed at an end of the slit in the one end part of the shaft on the one lateral side of the shaft.

Valve body insert apparatus and related methods are described. An example method includes inserting a first sleeve in a drive shaft bore of a valve body. The first sleeve is to line a first inner surface of the drive shaft bore to protect the first inner surface of the drive shaft bore from corrosion or erosion, and the first sleeve defining a first opening to receive a drive shaft. The method includes applying cladding to wetted surfaces of the valve body defining a fluid flow passageway and to at least a portion adjacent a first end of the first sleeve positioned in the fluid flow passageway, where cladding material is not applied to portions of the first inner surface of the drive shaft bore covered by the first sleeve.

A damper device and a total heat exchanger including the same are provided in the present application, including: a damper plate, including an air port cover plate, and a rotating shaft disposed at the air port cover plate and extending along a diameter direction of the air port cover plate; and a damper plate fixing base configured to fix the damper plate inside the damper plate fixing base and including a fixing groove formed opposite to the rotating shaft and configured to fix the rotating shaft, the fixing groove including a recess disposed opposite to the rotating shaft and formed by further being recessed from at least a part of the outer circumference of the fixing groove. According to the above technical solutions of the present application, the damper device can ensure performance without reducing the air volume under low temperature conditions, and can also suppress icing of the damper device.