Abstract: A stem packing assembly including a first annular member defining a central axis, a second annular member defining a central axis coaxial with the central axis of the first annular member, and an annular energizing member defining a central axis coaxial with the central axis of the first annular member. In an embodiment, the stem packing assembly can have a leakage rate according to ISO 15848-1 of less than 1×10?4 mgs?1m?1 for at least 500 cycles at 160° C., and less than 1×10?4 mgs?1m?1 for at least 500 cycles at ?46° C. In another embodiment, the first annular member can include a PAEK, the second annular member can include a PTFE, and the annular energizing member at least partially includes a PTFE.
Abstract: A connector is provided, in one embodiment, the connector includes a collar (16) configured to receive first and second components (12,14). In this embodiment, the connector may also include a load ring (50) configured to be received in a groove (46) of the second component (12) and to move into and out of engagement with the collar (16) when the second component (12) is received by the collar (16). The connector of this illustrative embodiment may also include a locking ring (62) configured to inhibit disengagement of the load ring (50) from the collar (16). In some embodiments, engagement of the load ring (50) and the collar (16) effects securing of the first and second components (12, 14) to one another.
Abstract: A gripping device may be used to grip an inserted member. The gripping device has a body. The body defines a passage extending therethrough between opposite longitudinal ends. The body has an outer surface and an inner surface. The body includes at least three gripping elements spaced apart around the inner surface. Each of the gripping elements has a gripping surface for gripping an outer surface of the inserted member. Each of the gripping elements is movable upon application of a radial inward force to the outer surface of the body to reduce the spacing between adjacent gripping elements.
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 valve stem is journaled in a journaling portion of a valve box in an upwardly and downwardly movable manner; a packing is interposed between the journaling portion and the valve stem; a packing gland is arranged above the packing; a yoke sleeve is provided above the packing gland; and a valve seat in the valve box is opened and closed with a valve element provided at the lower end of the valve stem by rotating a handle fitted into the yoke sleeve to move the valve stem upward and downward. A protective tube formed integrally with the packing gland is provided between the packing gland and the yoke sleeve around the valve stem. A guide projection with which the inner periphery of the upper end of the protective tube comes into contact is provided on the lower surface of the yoke sleeve.
Abstract: A gland packing provided in a fluid apparatus such as a pump and compressed in an axial direction so as to prevent penetration leakage of a fluid is provided. The gland packing has a packing base material 11 of a predetermined length including a band-like flat braid 12 braided by moving a plurality of yarns 13 along one track K. The band-like packing base material 11 is shaped into a ring by abutting longitudinal ends 12a and 12b of the packing base material 11 so that a width direction thereof is parallel with a packing axial direction, and is then compressed in the axial direction, whereby the packing base material 11 is overlappedly folded in a packing axial direction, with a longitudinal direction of the packing base material 11 as a direction of folding lines 14.
Abstract: The present invention relates to a machine arranged to operate in explosive environments, comprising a rotatable shaft (16) extending through a stationary part (10) of said machine, a gland (20) which is mounted in said stationary part (10) and which is provided with a through hole in order to accommodate said rotatable shaft (16) such that a flame path is provided between the rotatable shaft (16) and the gland (20). The invention is characterized in that the machine comprises dampening means (42) arranged between and separates the gland (16) and the stationary part (10) in the axial and radial directions such that a flame path (50, 56) is provided, the dampening means (42) maintaining the flame path (50, 56) and permitting axial and radial movement of the gland (20) in relation to the stationary part (10) upon rotation of the rotatable shaft (16).
Abstract: A remotely actuated packing follower for compacting the packing in a base and base extension situated around a rotatable or longitudinally pulsatable shaft exiting a structure. The remotely actuated packing follower comprises a piston slidably and sealingly mounted within a housing and a packing follower cap sealingly attached to the top of the housing. The packing follower cap has a channel for fluid from a remote source to flow from a hose attached to the channel. The piston, housing, and packing follower cap create a chamber. When sufficient fluid flows into the chamber, it pushes the piston away from the packing follower cap so that the bottom of the piston can push against the packing. An inner channel in the piston accommodates the shaft. Either the remotely actuated packing follower or a traditional anti-leak fitting is optional constructed of releasably connectable sections.
Abstract: A seal device for a rotary shaft includes a sleeve, a gland, a ring, a guide block, and a fixing member. The guide block has an outer block surface extending circumferentially and abutting against a portion of an inner gland surface of the gland, and an inner block surface extending circumferentially and opposite to the outer block surface. The outer block surface has two circumferentially opposite outer ends. The inner block surface has two circumferentially opposite inner ends. The guide block further has two opposite end faces each of which connects one of the outer ends to one of the inner ends. The inner ends subtend an angle of not larger than 90° at a center line of the gland. At least one of the end faces lies in a plane line that is substantially tangent to an outer peripheral face of the ring.
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.
August 16, 2005
Date of Patent:
July 19, 2011
Fisher Controls International LLC
Lynn Dean Mahncke, David John Koester, Jason Gene Olberding, Andrew Kinser
Abstract: A stuffing box for sealing around a polished rod in a well including a cylindrical connector for receiving the polished rod, a packing member having top and lateral surfaces and wherein the packing member is concentrically disposed around the polished rod, a body concentrically disposed around the packing member and sealing engaging the cylindrical connector, and wherein the body may be selectively moved to expose the top and lateral surface of the packing members is disclosed. A method of repairing, redressing, or replacing packing members of a stuffing box including providing a stuffing box at a wellhead, manipulating the stuffing box such that top and lateral surfaces of the packing members are exposed, removing the packing members, and redressing the stuffing box with new packing members is also disclosed.
June 11, 2007
Date of Patent:
January 4, 2011
Smith International, Inc.
Paul McCreedy, Merlin Thiry, Ray Neudorf
Abstract: A fluid seal assembly consists of a seal of compliant material that interacts with a seal carrier. The seal carrier includes one or more elements of relatively rigid material defining a sealing face with a seal-receiving groove interrupting the sealing face. The seal-receiving groove has defining walls each of which has a proximal end at the sealing face and a distal end. The defining walls serve as seal contact surfaces. At least one of the seal contact surfaces converges inwardly to narrow the seal-receiving groove toward the distal end. The seal-receiving groove has a depth and a breadth suitable for accepting the seal, with the seal projecting past the sealing face when compressed to be in contact with the seal contact surfaces.
Abstract: Packing followers for use with valves are described. An example packing follower for use with a valve includes a body having an elongated portion and a bore therethrough to receive a shaft. A portion of the bore is tapered to exert a force on a retainer that at least partially surrounds and is positioned within a groove of the shaft when the shaft moves toward an opening defined by the body. Additionally, the force has a first component in a direction perpendicular to a longitudinal axis of the bore and a second component smaller than the first component in a direction parallel to the longitudinal axis of the bore.
Abstract: A sealing gland for accommodating a ribbon-shaped element is provided to include a fitting, a bore, an alignment assembly and a cap portion. The bore extends along an axis through the fitting. The alignment assembly is configured to be mounted within the bore and includes an element slot such that the ribbon-shaped element can extend through the alignment assembly. The element slot is cuboidal in shape and is defined by a length, a height and a width. The alignment assembly is arranged so that the length is parallel with the axis. The cap portion is configured to be mounted on the fitting to retain the alignment assembly.
Abstract: A seal structure sealing a fitted part between the guide surface of a bearing part and a shaft part to prevent a fluid from flowing in a direction from a high-pressure fluid side to a low-pressure fluid side. The seal structure comprises a seal ring storage part having a radial contact surface surrounding the shaft part which is formed on the high-pressure fluid side of the bearing part and a seal ring disposed in the seal ring storage part, allowing its side surface facing the contact surface to come into contact with the contact surface, and allowing its inner peripheral surface to be fitted to the outer peripheral surface of the shaft part. The seal ring is formed in such a relative dimension that, even if elastically deformed by the pressure of the sealed fluid, the elastically deformed expanded portion thereof is not brought into contact with the peripheral surface of the seal ring storage part.
Abstract: A device for float mounting a sealed housing around a rotating, deflecting shaft. A sealed housing is connected to a static part in such a way that it can yield radially as well as rotate around a shaft axis at least to a small extent.
Abstract: Disclosed herein is a mechanical sealing device for preventing fluid leakage. The sealing device has a sealing chamber formed by a flange, a seal casing and a seal cover at a position outside a gland ring. This gland ring is used for holding the gland packings installed in a stuffing box of each of rotary and stationary sealing rings. The rotary and stationary sealing rings are provided in the sealing chamber. In this case, the rotary sealing ring is fixed to a sleeve. The stationary sealing ring comes into contact with both the sleeve and the rotary sealing ring, and is held by a slip ring biased by a spring. The spring is provided between the stationary sealing ring and the flange. Further, the sealing device has an additional sealing ring, which is provided on the inner surface of each of the gland ring and the seal cover, and comes into contact with the sleeve.
Abstract: The invention provides a packing assembly for rotating and/or oscillating machine shafts arranged in a machine housing. The packing assembly comprises a packing accommodation unit floating on said shaft. The packing accomodation unit is supported on the housing by means of a ball joint assembly that is pivotable and translatory movable in a radial direction to and from the shaft. The ball joint assembly comprises a ball member provided with a central bore received in a ball socket. A guiding element projecting into the bore of the ball member serves for translatory guiding the ball member along the axis of the bore in the ball member, whereby the axis of the bore on the ball member runs essentially perpendicular to the central longitudinal axis of the shaft.
Abstract: A fitting including a housing (2), a rotatable body (4) which is situated in the housing and which may advantageously be constructed in the form of a conical plug, a bushing (18) provided in the housing to floatingly mount and seal the rotatable body (4), a cover (14) connected to the housing (2), a shaft (12) coupled with the rotatable body (4) and extended out through the cover (14), and at least one sealing element (30, 44) associated with the shaft (12). The fitting is configured in such a way that the bushing (18), the at least one sealing element (30, 44), and the cover (14) can be positioned and mounted centrally and free from transverse forces in relation to the axis (10) of the floatingly mounted rotatable body (4).
Abstract: A dynamic seal for a drive shaft including a seal housing with at least one inlet for injecting a fluid, (i.e., a liquid or gas) into the seal. The seal also has an expeller device, such as an expeller ring mounted on the drive shaft, for expelling the injected fluid along the drive shaft in the direction of the casing. In addition, the seal may employ sealing rings positioned to prevent the injected fluid from escaping the seal in a direction other than along the shaft toward the casing, such as a glass-filled PTFE ring positioned proximal to the expeller device and a seal adjuster for compressing a graphite-yarn packing ring against the glass-filled PTFE seal ring. Further, the seal may additionally or alternately include a fitted sleeve covering the drive shaft to protect the shaft from wear and corrosion.
Abstract: A packing device, for sealing a longitudinal shaft against leakage of a pressurized fluid, having an elongate valve housing with an annular internal chamber about a coaxial rotatable shaft. The chamber has an inner end with an annular stationary packing support shoulder exposed to pressurized fluid and an outer end with an annular packing access opening exposed to ambient air pressure. Annular self travelling pressure energized retained chevron packing is disposed within the chamber, an inner end thereof engaging the stationary packing support shoulder. An axially slidable ring engages an outer end of the packing, and gland housing engages an outer end of the slidable ring. The gland housing includes compression mountings for loading the packing. For limiting the axial movement of the ring within the chamber when the gland housing is removed, the valve housing includes an annular groove within which a floating retaining clip is slidably disposed.
Abstract: A self aligning stuffing box for pump jacks includes a first tubular body having an interior bore with internal stops. A second tubular body has a first end with a concave contact surface. The second tubular body is telescopically received within the first tubular body with the concave contact surface precluded from withdrawal by the internal stops. An annular body is received within the interior bore of the first tubular body. The annular body has a convex contact surface which engages the concave contact surface of the second tubular body. A third tubular body is received within the first tubular body and exerts a compressive force upon the annular body to maintain the convex contact surface engaged with the concave contact surface of the second tubular body during relative movement.
Abstract: A Y-block fluid section plunger pump housing has a cylinder bore which is transversely elongated at its intersection with suction and discharge bores to provide stress relief and a reduction in housing weight. An integral suction valve retainer arm further reduces stress near the bore intersection. Tapered cartridge packing assemblies facilitate use of a one-piece plunger in Y-block housings and also allow packing in such housings to be changed without removing the plunger.
Abstract: A balance shaft seal retainer for retaining the front balance shaft seal of an engine oil pump. At least one bolt threaded within one or more apertures of the retainer and into the engine secures the seal retainer on the oil pump housing. The semi-circular cutout at the bottom edge of the retainer effectively holds a semi-circular region of the annular seal in place and permits installation without the need to remove the balance shaft or timing or balance belt.
Abstract: A rotating connection device forming a seal between an inner element (1) and an outer element (14) of larger diameter than the inner element, these two elements being co-axial, cylindrically symmetric and rotating in relation to one another. It comprises a shell (16) placed in the annular space between the two elements, at least a first ring-type seal (19) secured to the shell, placed between the latter and inner element (1), at least a second ring-type seal (23) placed between two opposite walls (22, 18) of shell (16) and of outer element (14), both perpendicular to the axis of rotation, and means (24-26) for pressing the two walls against one another by means of the ring-type seal with an adjustable application force. This connection device allows substantial motions between the two elements, radial as well as longitudinal. The device can be used: for example for connecting a pipe linking an outer device and the central part of the rotating ring gear of a heat exchange and/or incineration system.
Abstract: Shaft seal for sealing between a shaft (2) and a machine housing (3). A seal and bearing casing (10) surrounds the shaft (2) to be sealed off and contains a rolling-contact bearing device (11) and a row of lip seals (13), the sealing lips of which engage the shaft surface (2) or a shaft protection sleeve (12). A compensation device (14) is connected, an the one hand, in a sealing manner to the casing (10) by means of a radially inner annular fastening part (23), and is connected, an the other band, in a sealing manner to the housing (3) by means of a radially outer annular fastening part (25), and has a flexible bridging portion (24) between the annular fastening parts (23, 25). The bridging portion (24) contains a first and a second elastomer ring seal (24a, 24b), which are arranged at an axial distance from one another in respective seat recesses (26, 27, 28) of the casing (10) and of the compensation device (14).
Abstract: An improved mechanical seal incorporating a pusher ring to hold the integral parts of the seal together, in lieu of a typical retaining ring and snap ring aligning and compressing the gland plate. The improvement consists of a pusher ring, fixedly attached to the seal body gland face with cap screws, which retains the gland plate, allowing for easy and safe repair and assembling.
Abstract: A gland seal assembly for a slurry pump comprising a main body having a bore therethrough for receiving a rotatable shaft, a packing receiving zone within the bore, the packing including at least two packing rings and a packing sleeve surrounding the packing rings and arranged so that axial compression of the packing sleeve can be translated at least in part, to radial compression of the packing rings.