Abstract: A stem sealing device for a valve can include a device body defining an annular shape; a stem seal defining an annular shape and configured to seal a gap between a valve stem of the valve and a valve body of the valve and positioned within the device body, the stem sealing device installable in and removable from the valve as an assembly without prior or subsequent removal of the stem seal; and a fastener configured to secure the device body to the valve body.

Abstract: A regulating flap, especially exhaust flap for the exhaust gas stream of an internal combustion engine, includes a flap body (12), a flap diaphragm (16) carried on a pivot shaft (14) that is rotatable about a pivot axis (S) in the interior of the flap body (12). A pivot drive (20) has a drive element (30) to be coupled with the pivot shaft (14). A fixing device (40) fixes the pivot drive (20) in relation to the flap body (12). The fixing device (40) includes a bayonet fastener (38).

Abstract: Embodiments of the present disclosure include a method of replacing valve operation methods during fracturing operations including installing a first operator on a first valve of a first fracturing tree. The method also includes installing a second operator on a second valve of a second fracturing tree, the second fracturing tree being adjacent the first fracturing tree. The method also includes removing the first operator from the first valve, the first valve maintaining a position on the first fracturing tree after the first operator is removed. The method further includes removing the second operator from the second valve, the second valve maintaining a position on the second fracturing tree after the second operator is removed. The method also includes installing the first operator on the second valve after the first operator is removed from the first valve and after the second operator is removed from the second valve.

Abstract: A valve assembly having a dynamic stem seal assembly includes a valve stem for moving a valve member from a closed position to an open position, the valve stem extending through a stem opening of a valve assembly body and having an axis. A packing assembly seals between the valve stem and the stem opening. The packing assembly has a seal assembly circumscribing the valve stem at a portion of the valve stem with a reduced outer diameter. The packing assembly also has a packing retainer assembly releasably secured to the valve stem at the portion of the valve stem with the reduced outer diameter. The packing assembly is axially static relative to the valve stem.

Abstract: In order to keep a stable flow rate at a set flow rate value when a pressure fluctuation occurs in an upstream side of a valve, without providing an additional sensor for detecting a pressure fluctuation, a flow rate control apparatus is provided with: the valve; a flow rate sensor; a valve control part configured to control the valve so that a deviation between a set flow rate value and a measurement flow rate value is reduced, on the basis of the deviation and a set control coefficient; and a control coefficient setting part configured to set the control coefficient so that when a pressure rise occurs in the upstream side of the valve, a decreased amount in flow due to a decreased opening of the valve and an increased amount in flow due to an increased amount of a differential pressure before and after the valve, are balanced.

Abstract: Mounting assemblies for use with fluid control devices are disclosed. An example apparatus includes a bonnet to be coupled to a valve and a mounting assembly including a first side to be coupled to an actuator and a second side to be rotatably coupled at an end of the bonnet to enable a rotational position of the mounting assembly to change relative to the bonnet.

Abstract: A valve with an integral bleed passage includes a valve body including a threaded bore, a bonnet having a first threaded portion arranged to be securable to the bore of the valve body and having a second portion disposed outside the valve body, and a cavity defined between the valve body and the first portion of the threaded bonnet. A bleed passage is formed in the bonnet and includes an entrance aperture formed in the first portion of the bonnet and in flow communication with the cavity, the passage including an exit aperture formed in the second portion of the bonnet, and a main portion providing flow communication between the entrance aperture and the exit aperture. The cavity and the entrance aperture are positioned to expose the passage to an interior portion of the valve prior to removal of the bonnet from engagement with the valve body.

Abstract: A packing mounting and removing device includes a packing mounting and removing rod, a rod support, a rod fixing nut, and a spiral line. The packing mounting and removing device includes a packing flange having a through hole, a gland bushing, a packing, and a lantern ring. A packing exchange method uses the same. By using the device it is not necessary to use any special equipment for removing the packing, and it is possible to mount and remove the packing without disassembling a driving section and a valve disc section. Therefore, it is possible to noticeably reduce time and cost required for the mounting and removing the packing.

Abstract: Methods and apparatus to load a valve packing are described. An example apparatus to load a valve packing includes a load assembly having a biasing element disposed between a valve packing flange and a stop flange to provide a load to a seal assembly. The packing flange is adjustable relative to the stop flange to adjust the load to be applied to the seal. A first guide member coupled to the packing flange or the stop flange provides a first predetermined distance between the packing flange and the stop flange. The first guide member provides an indication of a first predetermined load to be provided by the load assembly when the packing flange and the stop flange are spaced at the first predetermined distance provided by the first guide member.

Abstract: A packing mounting and removing device includes a packing mounting and removing rod, a rod support, a rod fixing nut, and a spiral line. The packing mounting and removing device includes a packing flange having a through hole, a gland bushing, a packing, and a lantern ring. A packing exchange method uses the same. By using the device it is not necessary to use any special equipment for removing the packing, and it is possible to mount and remove the packing without disassembling a driving section and a valve disc section. Therefore, it is possible to noticeably reduce time and cost required for the mounting and removing the packing.

Abstract: A valve including a valve body having a bore and a spindle received in the bore, the spindle being actuatable to open and close the valve. A compression gland seal is provided about the spindle for compression between the spindle and the bore. A first seal ring is provided about the spindle at a position spaced along the spindle from the gland seal, and provides a seal between the spindle and the bore of the valve body. A second seal ring is provided about the spindle at a position spaced along the spindle from the gland seal and the first seal ring, and provides a further seal between the spindle and the bore of the valve body.

Abstract: A valve packing assembly for a control valve includes a seal assembly, a loading assembly, and a packing retainer. The seal assembly has a seal component to provide a fluid seal around a valve stem and an anti-extrusion component to substantially prevent extrusion of the seal component about the valve stem. The loading assembly is configured to advantageously provide a predetermined packing stress to the seal assembly that is in the same direction as a process stress applied to the seal assembly by a process fluid, thereby substantially reducing packing friction and packing wear in the control valve assembly.

Abstract: A packing nut assembly for a control valve having a valve body and a valve stem includes a packing box arranged for operative coupling to the valve body and having a primary bore sized to receive the valve stem and first and second counterbores. The first counterbore is sized to receive valve packing and the second counterbore includes internal threads. A packing nut having a central bore is sized to receive the valve stem and includes a threaded outer surface positioned to engage the second counterbore of the packing box. The packing nut includes an adjustment surface positioned to face the first counterbore, and includes an adjustment head having a plurality of tool-receiving apertures sized to receive an adjustment tool.

Abstract: A valve having a valve packing removal device attached thereto is disclosed. The valve may include a valve plug reciprocally disposed within the valve housing and connected to a sliding stem. The packing may be provided about the valve stem to ensure or minimize leakage of regulated fluid from the valve. A sleeve may have a diameter less than a bore in which the packing is disposed and may be connected to the valve stem such that when the valve stem is sufficiently pulled from the valve, the sleeve engages the packing and pulls the packing from the valve.

Abstract: A valve stem has a thickness of hardfaced material on its outer diameter in the area contacting the stem packing where the seal is formed which prevents corrosion, erosion and/or scratching of the valve stem, thereby preventing formation of leak paths. A valve packing comprises a vertically stacked array comprising alternating metal pressure rings and graphite seals.

Abstract: A valve stem has a thickness of hardfaced material on its outer diameter in the area contacting the stem packing where the seal is formed which prevents corrosion, erosion and/or scratching of the valve stem, thereby preventing formation of leak paths. A valve packing comprises a vertically stacked array comprising alternating metal pressure rings and graphite seals.

Abstract: A valve stem has a thickness of hardfaced material on its outer diameter in the area contacting the stem packing where the seal is formed which prevents corrosion, erosion and/or scratching of the valve stem, thereby preventing formation of leak paths. A valve packing comprises a vertically stacked array comprising alternating metal pressure rings and graphite seals.

Abstract: An improved bottom entry cryogenic valve, with single piece cast body, that provides for easy and efficient removal of the valve stem and valve seat components without removing the valve body from the fluid circuit. The valve body forms the housing and has a top end, a main body section and a bottom entry end. The main body section has fluid entry and fluid exit openings. A bonnet nut is attached to the valve body top end. A body ring is attached at the bottom entry end. A valve stem extends axially through the bonnet nut, with a top portion exposed with a hand wheel attached thereon. The valve stern has a mid portion, a flange portion and a threaded bottom end located in the main body section of the valve body. The valve stem mid portion supports a valve seal member and a seal nut/bearing. The valve seal member is to prevent fluid from flowing through the valve body when the valve is in a closed position. The seal nut/bearing acts to restrict fluid from entering the top end portion of the valve body.