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 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 high purity valve (10) includes a valve body (12) having an inlet (40) and an outlet (42) separated by a valve seat (32), and a diaphragm (22) having a central stem (23) that has a first end coupled to a piston (20) for actuating the valve, and a poppet (28) for engaging the valve seat to close the valve. The poppet forms a dual point seal (50/52, 50′/52′) with the valve seat having at least two points of contact between an annular surface (30) of the poppet and the valve seat. The annular surface of the poppet may be either a concave surface or a convex surface that provides the dual point seal. The valve has a retainer (14) adjacent the diaphragm, and the diaphragm has a flexible web (26) that extends radially outward from the central stem. The retainer has a surface (60) adjacent the web, and the surface is spaced apart from the web such that the web does not contact the surface when the valve is pressurized.

A capacity control valve includes a main valve that opens and closes communication between a discharge port and a control port formed in a valve housing by movement of a rod driven by a solenoid, a CS communication passage providing communication between a control fluid supply chamber formed in the valve housing and a suction port, and an on-off valve formed by a communication passage forming member having an annular valve seat in an outer periphery of the CS communication passage and an on-off valve element biased in the valve closing direction with respect to the valve seat.

Embodiments provide a gate valve including a first body half that defines a first process fluid aperture, a first chest portion, and a first chest gate support recess formed in the first chest portion. A second body half defines a second process fluid aperture that is aligned with the first process fluid aperture, a second chest portion, and a second chest gate support recess that is formed in the second chest portion. A gate is movable relative to the first body half and the second body half. A first chest gate support is received within the first chest gate support recess, and a second chest gate support is received within the second chest gate support recess.

A fluid control valve includes: a valve housing including a flow path formed therein and having inflow and outflow ports for a fluid; a valve seat formed in the flow path; a driving device mounted in the valve housing; a valve shaft configured to be moved by being driven by the driving device; a valve body mounted on the valve shaft so as to open or close the flow path by being separated from or brought into contact with the valve seat; and a diaphragm formed in a form of an annular thin film and including outer and inner circumferential portions, and configured to move together with the valve shaft in a state where one side thereof faces a fluid chamber including the flow path and the valve seat so as to allow the fluid to flow therethrough, and the other side thereof faces an atmosphere chamber.

A cooled isolation valve includes a valve body, a stationary element coupled to the valve body, and a movable closure element movable with respect to the stationary element between a closed position in which the movable closure element and the stationary element are brought together and an open position. One of the movable closure element and the stationary element includes a sealing element. In the closed position of the movable closure element, the sealing element provides a seal between the movable closure element and the stationary element. A fluid channel is formed in contact with the movable closure element and movable with the movable closure element with respect to the stationary element, such that a fluid in the fluid channel effects heat transfer in the movable closure element. A bellows of the isolation valve can include a metallic substrate with a ceramic coating.

A cooled isolation valve includes a valve body, a stationary element coupled to the valve body, and a movable closure element movable with respect to the stationary element between a closed position in which the movable closure element and the stationary element are brought together and an open position. One of the movable closure element and the stationary element includes a sealing element. In the closed position of the movable closure element, the sealing element provides a seal between the movable closure element and the stationary element. A fluid channel is formed in contact with the movable closure element and movable with the movable closure element with respect to the stationary element, such that a fluid in the fluid channel effects heat transfer in the movable closure element. A bellows of the isolation valve can include a metallic substrate with a ceramic coating.

A stepper motor proportionally controlled bellows valve system comprising: a valve manifold; one or more stepper motors; and one or more bellows valves. The one or more bellows valves may comprise a bellows, a sealing washer, and a profile washer. The sealing washer is configured to removeably engage with a vacuum orifice rim. The profile washers are configured to stick into the valve orifice, such that the profile washer defines a flow through the valve.

In order to make it possible to increase a diameter and output thereof, a diaphragm structure is provided that has low repulsiveness, can be largely deformed to increase a stroke even without being applied with a large force from an actuator, and is unlikely to give rise to a defect or fault even when formed thin, and a fluid control valve is provided with the diaphragm structure and the actuator that presses the diaphragm structure, wherein the diaphragm structure is provided with: a protruding part that is formed in a tubular shape and pressed by the actuator; a brim part that spreads from a base end of the protruding part outward with respect to the protruding part; and a support part that is formed on an outer circumference of the brim part and attached to another member, and the brim part is formed in a film shape.