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 centric butterfly valve (1) in which top and bottom boss surfaces (19, 29) are formed to be spherical, an outer peripheral end of the blade portion of the valve disk (24) is formed to be an M-shaped section part (29) with round-shaped apex parts (27) and a round-shaped valley part (28) smoothly linked, and the centric butterfly valve has a valve disk (3) having an extended part (41) obtained by successively and slightly extending the spherical surface of each of the top and bottom boss surfaces (19, 20) to a blade portion (40) side.

A valve and coupling for joining pipe elements has a valve body captured in a central space defined by a plurality of coupling segments attached to one another end to end. The inner surface of the valve body defines a bore. A liner on the inner surface surrounds the bore and forms a seal with a valve closing member. Circumferentially arranged projections on the segments engage and center the valve body within the central space. The liner has lobes that extend axially in opposite directions. The lobes are compressed between the segments and the pipe elements to form a fluid tight seal when connection members are tightened to draw the segments toward the central space and into engagement with the pipe elements.

A butterfly valve includes a valve element that turns with a shaft to control open/closed states of a passage or adjust an opening degree of the passage. The valve element includes a plate and an elastic member provided along an outer circumference of the plate. The elastic member has seal parts that touch and leave an inner surface of the passage to close and open the passage. The plate has specific shapes on both sides with respect to an axis of the shaft, the specific shapes narrowing gaps between the plate and the inner surface on lower-pressure sides of seal centers of the seal parts in a valve closed state.

A butterfly-valve seat ring and fixing structure of the same, and an eccentric-type butterfly valve in which, the butterfly-valve seat ring has a flexible part (31) with a predetermined material thickness integrally and extendedly provided on one side surface of an inner diameter of a ring-shaped base body part (30) having a substantially rectangular shape in section and has a fixing part (32) integrally and extendedly provided on one side surface of an outer diameter of the base body part, has a recessed-shaped space part (40) provided between an outer circumferential surface (36) of the flexible part and an inner circumferential surface (37) of the fixing part, and has a seal contact part (35) provided to project at an inner diameter position of the flexible part. The seal contact part is positioned on an inner circumferential surface of the flexible part rather than a depth-side position of the space part.

A butterfly-valve seat ring and fixing structure of the same, and an eccentric-type butterfly valve in which, the butterfly-valve seat ring has a flexible part (31) with a predetermined material thickness integrally and extendedly provided on one side surface of an inner diameter of a ring-shaped base body part (30) having a substantially rectangular shape in section and has a fixing part (32) integrally and extendedly provided on one side surface of an outer diameter of the base body part, has a recessed-shaped space part (40) provided between an outer circumferential surface (36) of the flexible part and an inner circumferential surface (37) of the fixing part, and has a seal contact part (35) provided to project at an inner diameter position of the flexible part. The seal contact part is positioned on an inner circumferential surface of the flexible part rather than a depth-side position of the space part.

Some embodiments of the invention provide a valve including a body, a valve element arranged within the body to selectively inhibit flow through the body, and a seal assembly that includes a body gasket and a retaining ring. The retaining ring includes a cutter that is arranged to cut the body gasket during installation. A two-plane seal is formed by cutting the body gasket between the retaining ring and the body.

A control damper for a housing of an air-handling unit includes a rigid main body rotatable about a first rotational axis. A sealing element extends radially outwardly from a first side of the rigid main body. The sealing element is formed of a resilient material. The sealing element further includes a resilient lip extending outwardly from a distal end thereof. The lip has a first series of undulations formed in an outer edge thereof, wherein the undulations form a wave-shaped profile in the outer edge of the lip.

A butterfly pressure control valve including a valve opening/closing mechanism (10) which includes: a valve body (11) rotatable in a direction perpendicular to a channel (4) in a body; a sheet ring (12) which can move a valve-seat sealing part toward and away from the valve body by making reciprocating movements in a direction of the channel; a cam mechanism (13) which separates the sheet ring (12) from the valve body (11) and rotates the valve body; and a reciprocating movement mechanism (14) which causes the sheet ring (12) to make reciprocating movements in a direction of the valve body, wherein the valve opening/closing mechanism (10) is an opening/closing mechanism which controls pressure in the channel (4) by rotating the valve body (11) without sliding with the sheet ring (12).

A butterfly pressure control valve including a valve opening/closing mechanism (10) which includes: a valve body (11) rotatable in a direction perpendicular to a channel (4) in a body; a sheet ring (12) which can move a valve-seat sealing part toward and away from the valve body by making reciprocating movements in a direction of the channel; a cam mechanism (13) which separates the sheet ring (12) from the valve body (11) and rotates the valve body; and a reciprocating movement mechanism (14) which causes the sheet ring (12) to make reciprocating movements in a direction of the valve body, wherein the valve opening/closing mechanism (10) is an opening/closing mechanism which controls pressure in the channel (4) by rotating the valve body (11) without sliding with the sheet ring (12).