A method of cutting and removing a section of prestressed concrete cylinder pipe and then installing a replacement valve while the pipeline is fully pressurized uses a replacement valve body (22) with two cylinders (223, 225) that match the openings of the cut pipe (35). Inside each of the two cylinders (223, 225) is a cut-covering assembly (62) which includes a cylindrical elastomeric seal (26) and spring tube (25), and a cross brace (27) extends between two surfaces within the spring tube (25). The replacement valve body (22) further includes a rotatable valve (24) in a central portion of the valve, and when the cylinder ends of the replacement valve body (22) are positioned adjacent the bores of cut pipe ends (36), the valve (24) can be rotated to push the elastomeric seals (26) of each of the cut-covering assemblies (62) into the bores of the cut pipe ends (36), thereby covering gaps (77) created when the pipe (35) was cut and placing the pipe ends (36) in fluid-tight engagement with the replacement valve body (22).

A method of cutting and removing a section of prestressed concrete cylinder pipe and then installing a replacement valve while the pipeline is fully pressurized uses a replacement valve body (22) with two cylinders (223, 225) that match the openings of the cut pipe (35). Inside each of the two cylinders (223, 225) is a cut-covering assembly (62) which includes a cylindrical elastomeric seal (26) and spring tube (25), and a cross brace (27) extends between two surfaces within the spring tube (25). The replacement valve body (22) further includes a rotatable valve (24) in a central portion of the valve, and when the cylinder ends of the replacement valve body (22) are positioned adjacent the bores of cut pipe ends (36), the valve (24) can be rotated to push the elastomeric seals (26) of each of the cut-covering assemblies (62) into the bores of the cut pipe ends (36), thereby covering gaps (77) created when the pipe (35) was cut and placing the pipe ends (36) in fluid-tight engagement with the replacement valve body (22).

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.

A disc assembly for use in an air valve with a valve body includes an outer disc with a concentric opening therethrough and an outer seal area, the outer seal area to selectively seal against the valve body, and an inner disc disposed in the concentric opening of the outer disc, the inner disc to selectively seal against the outer disc.

A coupling device (32) provides a rotary coupling of a pivot shaft (18) of a flap diaphragm (16) of an exhaust gas flap (10) with a drive element (34). The pivot shaft is to be rotated about a pivot axis (A). The coupling device (32) includes a first coupling part (36) with a first coupling area configured for coupling with the pivot shaft (18) and a second coupling part (38) with a second coupling area configured for coupling with the drive element (34). The first coupling part (36) and the second coupling part (38) are in a rotary coupling positive-locking meshing state with one another in the coupled state and are supported on one another in the direction of the pivot axis (A).

A coupling device (32) provides a rotary coupling of a pivot shaft (18) of a flap diaphragm (16) of an exhaust gas flap (10) with a drive element (34). The pivot shaft is to be rotated about a pivot axis (A). The coupling device (32) includes a first coupling part (36) with a first coupling area configured for coupling with the pivot shaft (18) and a second coupling part (38) with a second coupling area configured for coupling with the drive element (34). The first coupling part (36) and the second coupling part (38) are in a rotary coupling positive-locking meshing state with one another in the coupled state and are supported on one another in the direction of the pivot axis (A).

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.

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.