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.

A throttle valve for adjusting the feeding of a gas to a fuel cell, which includes: a valve body, divided into a first and a second portion; a gas feeding duct obtained in the first portion; a throttle plate arranged in the feeding duct; a shaft which is rotatably mounted in the first portion and supports the throttle plate; and an actuator which is mounted in the second portion and is configured to rotate the shaft. The throttle valve further comprises a magnetic joint, which transmits the motion from the actuator to the shaft and is divided into a first half coupled to the shaft, and a second half facing the first half and coupled to the actuator. The throttle valve also includes an insulating wall which insulates the first partition, in a pneumatically sealed manner, from the second portion of the valve body and is arranged between the two halves of the magnetic joint.

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 high-pressure self-sealing butterfly valve, which comprises a valve body and a valve shaft, wherein a flow channel and a butterfly plate are arranged in the valve body, a pure metal sealing ring and a pure metal valve seat are sequentially arranged at a portion, on the outer side of the butterfly plate, of the flow channel, a piston cavity is further formed in a flow direction end face of the pure metal valve seat, and an upper valve shaft and a lower valve shaft are arranged at the upper end and the lower end of the valve shaft respectively; an upper end cover assembly and an upper self-sealing assembly are arranged between the end part of the upper valve shaft and the valve body, a lower sealing bottom cover and a lower self-sealing assembly are arranged between the end part of the lower valve shaft and the valve body.

A valve device for a fuel cell arrangement in a motor vehicle includes: a housing; a flow channel that extends in the housing; a spindle mounted rotatably in the housing; a flap fastened to the spindle, the flap being arranged in the flow channel and configured to close off the flow channel, the flap having a bore via which bore the spindle penetrates the flap; a drive configured to drive the flap via the spindle; a valve seat arranged in the flow channel, the valve seat, in a closed position of the flap, being in contact with the flap, wherein the spindle penetrates the flap at an angle and openings of the bore each lead to one side of the flap; and a seal arranged In the bore between the flap and the spindle.

A valve seat includes a first end; a second end positioned opposite from the first end; and a body extending from the first end to the second end, the body defining an inner surface and an outer surface, the inner surface defining a main bore extending through the body from the first end to the second end, the main bore defining a main bore axis, the body defining a shaft bore extending from the inner surface to the outer surface, the shaft bore defining a shaft bore axis positioned perpendicular to the main bore axis, the shaft bore defining an inner shaft opening and an outer shaft opening, the body defining a concave seat bearing surface extending around the inner shaft opening.

A surface of a bearing member on a flow passage forming chamber-side is disposed to be exposed to the chamber. The bearing member includes a contact part, with which a side surface of a butterfly valve that is opposed to the bearing member is in contact, on at least a part of the surface of the bearing member on the chamber-side. The bearing member is a radial ball bearing and includes an outer bearing ring that is fitted to an inner periphery of a shaft hole, so that its axial displacement relative to a body is restricted, an inner bearing ring that is fitted on an outer periphery of a rotation shaft radially inward of the outer bearing ring, and a rolling element disposed between the outer bearing ring and the inner bearing ring. The contact part is provided on a surface of the inner bearing ring on the chamber-side.

A valve device has a housing, and a flow channel running in the housing, in which a valve flap is fastened on a shaft arranged perpendicularly to the flow direction. The shaft is rotatably mounted in housing. The bearing formed as a loose bearing is surrounded by a spring retainer, the base of which lies on a bearing bush of the loose bearing and has a jacket surface with a radial wavy shape.

A valve device includes: a housing; a valve element; a rotatable shaft that rotates the valve element; a seal member that is slidably in close contact with an outer peripheral surface of the rotatable shaft to limit penetration of gas through a gap between the rotatable shaft and the housing; and a mounting ring that is shaped in a ring form and mounts the seal member to the housing. The mounting ring has: a ring portion, a one-side plate portion and an opposite-side plate portion which are formed from a single continuous plate material. The one-side plate portion and the opposite-side plate portion clamp the seal member therebetween and are joined together through the ring portion.