摘要:
A system including a valve. The valve includes a valve body having an interior volume and a bore along a first axis. A stem extends along a second axis and a flow control element couples to the stem. The stem selectively moves the flow control element through the interior volume between a closed position and an open position relative to the bore. A valve insert system retains a pressurized lubricant in the interior volume.
摘要:
A valve for use in oil and gas production or similar applications includes a plug or other flow barrier disposed in a cavity of a hollow valve body with a metal-to-metal sealing surface that is not reliant on any rubberized or elastomeric material to effect a seal.
摘要:
A vacuum valve includes a valve opening and a valve plate that opens and closes the valve opening. A part of an edge of the valve opening is a wedge edge portion having a wedge shape projected outward. The wedge edge portion is provided in a region where the valve plate starts to open the valve opening when the valve plate is moved to open the valve opening.
摘要:
In a slide valve, especially for coating installations, for fluidic separation of two modules or chambers, interconnected through an opening, containing at least one slide plate, integrated in a housing transfixed by said opening, and which may be bidirectionally moved between an inactive position, releasing said opening, and an operating position, completely covering said opening, and at least a closing drive, which may be activated to act upon said slide plate in its operating position and for its sealing contact in a closed position against a sealing surface transfixing said housing, according to the invention, at least one of said closing drives is firmly attached inside housing, relative to the activating movement of said slide plate.
摘要:
Valve sealing assemblies and methods of sealing a valve engaging member to a valve body. A first seat member is fixedly disposed within a valve body pocket. Two seal rings are disposed between a valve pocket and a pocket insert and a seal ring is disposed between the pocket insert and a seat member to provide a downstream seal. A built-in lip on one of the seat members and an accommodating groove on the other seat member prevent debris from entering the space between the two seat members. A retainer ring on the exterior annular surface of pocket insert seat member retains the pocket insert within valve body. A retainer ring on the exterior annular surface of the seat member retains the seat member within the pocket insert.
摘要:
A shut-off device with an annular sealing seat (6) composed of annular metallic membranes (9, 10) having approximately identical surfaces and joined to each other on their outside diameter by a weld seam (18) and connected on their inside diameter in a tightly sealed manner to the ring (16) by weld seams (19, 20). The two membranes (9, 10) and the ring (16) together form a pressure chamber (11) in which pressure Ps is effective and which is connected via a bore (17) to the interior of housing (7) in which pressure Pb prevails. Pressure chamber (11) is also connected via a bore (12) and pipe (13) to the external shut-off valve (8). When shut-off device (1) is completely unpressurized, membrane (10) contacts shut-off element (2) at least at least on an interrupted circular line. Operating pressure Pb prevails inside pipes (3). This operating pressure should be reliably sealed off from the rest of the shut-off device (1) in each operating phase by the flexible sealing seat (6), the rigid seat (5) and and the shut-Off element (1). Seal gas pressure Pg is effective inside the rest of the housing (7) and must be higher than operating pressure Pb. Pressure Ps prevails inside pressure space (11) inside membrane system (9, 10) and is equal to pressure Pg when the shut-off element (1) is at rest. the pressure differential of Pg and Pb on the annular surface with the outside diameter, the middle seal diameter (22) and the inside diameter of the membrane (9) serves to deform the membranes (9, 10) toward the shut-off element (1), thus compressing the sealing surfaces. Pressure compensation prevails on all other surfaces, especially on those of the membrane (10). In order to displace the shut-off element (1), the compression of the sealing surfaces must be reduced to a minimum. This is achieved by opening the external shut-off valve (8). Since the cross-section of bore (17) is considerably smaller than that of bore (12), pressure Ps decreases almost to zero.
摘要:
A pipe valve assembly including a housing defining a flow aperture, a valve member for opening and closing the flow aperture, a spring biased valve seat ring for pressing the valve member to seal the aperture, a spring assembly urging the valve seat ring away from its sealing position and a fluid pressure chamber on one side of the spring assembly for receiving fluid pressure to actuate the valve seat ring into its sealing position. The spring assembly in formed with a smaller diameter annular spring member and a larger diameter annular spring member arranged coaxially relative to each other and relative to the valve seat ring with the valve seat ring being attached with an outer edge of the smaller diameter spring member and the inner edge of the larger diameter spring member. The spring assembly is supported in the housing at an inner edge of the smaller diameter spring member and at an outer edge of the larger diameter spring member.
摘要:
A valve housing is adapted to be built into a pipeline, and a valve plate is movable into a valve-closing position in the housing. A displaceable sealing member provides a seal between the valve plate and the housing. At least one spring tends to displace the member into sealing position, and at least one pressure-medium actuated bellows is arranged, upon receiving the pressure medium, to displace the member away from sealing position.
摘要:
Sealing means for a flat gate valve comprising one-piece seat rings on both sides of the gate. A resilient O-ring is loosely received in an annular groove in the leading face of each seat ring and the leading faces of the seat rings, radially outward of the annular groove are relieved to provide small clearances with the sides of the gate. A series of vent ducts are provided in the seat ring at the bottom thereof from the bottom of the O-ring groove to the valve body space radially outward of the seat ring.
摘要:
A floating seat ring for a gate valve structure has an external pressure source to move the seat ring into engagement with the gate valve. A pocket for the seat ring is formed by a counterbore in the valve body and a tubular insert is inserted within the valve body bore extending within the seat ring. This inner end portion of the tubular insert defines with the counterbore the pocket for the seat ring for floating back and forth movement. An external pressure source is in fluid communication with the pocket behind the seat ring to move the seat ring outwardly.