A gas valve includes a valve seat, a valve stem, a valve body, and a valve diaphragm. The valve body acts together with the valve seat in such a way that the gas valve is in a closed state when the valve body is pressed against the valve seat and the gas valve is in an opened state when the valve body is lifted up from the valve seat. In a partially opened state, a connection between the valve stem and the valve body allows the valve body to tilt relative to the valve stem. The tilt may help provide more stable contact between the valve body and the valve seat when the gas valve is in the partially opened state. This can reduce wear on the gas valve by reducing, for example, valve body bounce.

A vacuum valve, having a valve seat including a valve opening (axis (A)), and a first sealing surface around the valve opening and defines a first sealing plane (E.sub.S), having a valve disk with a second sealing surface corresponding to the first sealing surface and defining a second sealing plane (E.sub.T), additionally having a first coupling element, connected to the valve disk and comprising a receiving means and a drive unit coupled with the first coupling element and is configured to provide the valve disk adjustable from an open position to a closed position. The drive unit and the valve disk are configured to provide a fine control position, wherein the valve disk is tilted relative to the valve seat where E.sub.S and E.sub.T enclose a defined angle (), and the seal abuts fully against one of the two sealing surfaces and in part against the other sealing surface.

A vacuum valve, having a valve seat including a valve opening (axis (A)), and a first sealing surface around the valve opening and defines a first sealing plane (E.sub.S), having a valve disk with a second sealing surface corresponding to the first sealing surface and defining a second sealing plane (E.sub.T), additionally having a first coupling element, connected to the valve disk and comprising a receiving means and a drive unit coupled with the first coupling element and is configured to provide the valve disk adjustable from an open position to a closed position. The drive unit and the valve disk are configured to provide a fine control position, wherein the valve disk is tilted relative to the valve seat where E.sub.S and E.sub.T enclose a defined angle (), and the seal abuts fully against one of the two sealing surfaces and in part against the other sealing surface.

Closure device or lock device for a vacuum chamber comprising a counter plate, which can be arranged on a vacuum chamber and surrounds an opening of the vacuum chamber, a frame, which is supported in such a way that the frame can be moved in relation to the counter plate and on which a closure cover is movably arranged, wherein the closure cover closes the opening in sealing manner in a closed position against the counter plate, at least one magnet device for producing a closing force acting between the counter plate and the closure cover, which is in engagement with the counter plate and with the closure cover.

A shut-off valve for use in a fluid transport or storage system includes a body defining an inlet port, an outlet port, and a fluid flow passageway extending between the inlet port and the outlet port, a seat arranged in the body adjacent the outlet port, a shaft at least partially disposed in the body, and a control assembly disposed in the body and operatively coupled to the shaft. The control assembly is movable between a closed position, in which a portion of the control assembly sealingly engages the seat to seal the outlet port, and an open position, in which the control assembly is spaced away from the outlet port and substantially outside of the fluid flow passageway, such that the control assembly provides minimal flow-restriction to fluid flowing through the fluid flow passageway.

A shut-off valve for use in a fluid transport or storage system includes a body defining an inlet port, an outlet port, and a fluid flow passageway extending between the inlet port and the outlet port, a seat arranged in the body adjacent the outlet port, a shaft at least partially disposed in the body, and a control assembly disposed in the body and operatively coupled to the shaft. The control assembly is movable between a closed position, in which a portion of the control assembly sealingly engages the seat to seal the outlet port, and an open position, in which the control assembly is spaced away from the outlet port and substantially outside of the fluid flow passageway, such that the control assembly provides minimal flow-restriction to fluid flowing through the fluid flow passageway.

A flow control valve comprising a valve seat provided with a valve hole and a seat surface, a valve element formed with a sealing surface corresponding to the seat surface, and a rotary shaft to which the valve element is integrally provided, the central axis of the rotary shaft being arranged eccentrically toward the radial direction of the valve hole from the central axis of the valve hole, and the sealing surface being arranged eccentrically toward the direction in which the central axis of the valve element extends from the central axis of the rotary shaft. The flow control valve has a valve element movement direction restriction member for stopping rotation of the valve element, and thereafter moving the valve element toward the valve seat while also relatively rotating the valve element about the eccentric axis eccentric from the central axis of the rotary shaft, relative to the rotary shaft.

A rotary multi-port valve having a valve body defining a valve chamber and having a plurality of inlet flow ports each having a stationary seat member therein and having a discharge port. A flow diverter member is supported by a valve stem and a tubular trunnion for rotation within the valve chamber and has a diverter chamber. A piston is hydraulically moveable within the diverter chamber and has driving connection with a diverter valve member is linearly moveable for sealing engagement with a selected stationary seat member. The diverter valve member is selectively retracted to a position completely within the valve chamber to permit selective rotation of the flow diverter member within the valve body to an aligned position with any of the inlet ports of the valve body.

A valve includes a housing defining therein a channel, a valve seat on an inner surface of the housing at a middle of the channel, a valve body member seated on and unseated from the valve seat to close and open the channel, and a stem spaced from the valve seat and rotatable around a first axis parallel with an opening surface of the valve seat. The valve body member and the stem respectively have a restricting hole and a restricting projection mutually slidably engageable to form a cam mechanism. The cam mechanism, in conjunction with rotation of the stem, reciprocates the valve body member between the seated position and the unseated position, and rotates the valve body member to be in a posture along a flow direction of a fluid flowing through the housing at the unseated position.

A valve includes a housing defining therein a channel, a valve seat on an inner surface of the housing at a middle of the channel, a valve body member seated on and unseated from the valve seat to close and open the channel, and a stem spaced from the valve seat and rotatable around a first axis parallel with an opening surface of the valve seat. The valve body member and the stem respectively have a restricting hole and a restricting projection mutually slidably engageable to form a cam mechanism. The cam mechanism, in conjunction with rotation of the stem, reciprocates the valve body member between the seated position and the unseated position, and rotates the valve body member to be in a posture along a flow direction of a fluid flowing through the housing at the unseated position.