Abstract: A sealing structure of a turbocharger includes a turbine housing including a scroll channel, a nozzle mount, a nozzle plate defining, with the nozzle mount, an exhaust gas channel for introducing an exhaust gas from the scroll channel to a turbine wheel, the nozzle plate including an annular plate portion that has a channel wall surface defining the exhaust gas channel and a tubular portion that extends from an inner peripheral end portion on a back surface of the annular plate portion toward a first inner wall surface of the turbine housing, and a sealing device for sealing a section between the first inner wall surface and an end surface of the tubular portion.

Abstract: Systems and features for improving sand control in pumps are provided. These features can be used in centrifugal pumps employed in a variety of oilfield applications, such as in electric submersible pumping systems positioned downhole in a wellbore to pump oil or other fluids. Such features include shielded anti-swirl ribs positioned in the balance chamber.

Abstract: A system for removing particulate matter from the gas in a gas discharge laser includes one or more nonwoven screens which are optimized for, among others, manufacturability and feature integration. The nonwoven screens are configured for precisely directing the flow to optimize the separation of particles from the gas flow and provide sufficient surface area for improved dust adherence.

Abstract: A variable nozzle unit includes a first plate, a second plate, a plurality of nozzle vanes each having a rotary shaft portion and a vane, a plurality of vane arms, and a unison ring. Each vane arm includes an engaging portion. The plurality of vane arms includes at least one extension arm. The extension arm includes an extension portion that has a shape extending from the engaging portion toward the second plate. The second plate has a receiving portion that receives the extension portion. The receiving portion includes a pair of contact walls, wherein the contact walls are brought into contact with the extension portion respectively at a position where each of the nozzle vanes maximizes the flow passage area of the exhaust air passage and at a position where the nozzle vane minimizes the flow passage area of the exhaust air passage.

Abstract: A method of manufacturing an integrated impeller has a first shroud forming a bottom portion, a second shroud forming a lid portion, a hub formed at the center portion of the first shroud, and blades that section a flow path which is formed between the first shroud and the second shroud and through which a fluid flows. This method includes forming a flow path on the inner circumferential side of the impeller; and forming a flow path on the outer circumferential side of the impeller. The step of forming the flow path on the outer circumferential side of the impeller has the steps of: while rotating the linear electrode having a tip-end part and a base-end part about a longitudinal direction axis thereof, applying electric discharge machining to the first shroud; applying electric discharge machining to the second shroud; and applying electric discharge machining to the blade.

Abstract: A method of manufacturing the aerofoil, and an aerofoil. The method includes: casting a first body portion having a passage passing there-through; casting a second body portion; and joining the first body portion and the second body portion to form the aerofoil. The passage extends from an opening at a first end at or near a leading edge to an opening at a second end at or near a trailing edge. The passage is formed during the casting process by a core; and the core is supported at the first and second ends through the respective openings of the passage.

Abstract: A boost pump includes a boost cover and a main pump housing engaged opposite to the boost cover with an impeller rotatably engaged between the boost cover and main pump housing. The impeller includes an inducer section comprising a hub including a plurality of axial blades extended therefrom, each of the plurality of blades including a root, a tip, first and second surfaces, wherein the each of the first and second surfaces is defined in TABLE 1. The impeller includes an impeller section comprising a shroud extending from the hub including a plurality of radial blades extended therefrom. Each of the plurality of blades can include including a root, a tip, and opposed pressure and suction sides extending from the root to the tip, wherein the each of the pressure and suction sides is a surface defined in at least one of TABLES 2-4.

Abstract: An annular diffuser is formed on an outlet side of a wheel in a housing. A shroud-side wall surface and a hub-side wall surface of the diffuser are parallel to a radial direction, respectively. A plurality of annular steps is formed on the shroud-side wall surface of the diffuser. Each step is formed so as to expand a flow passage width of the diffuser along a flow direction of a main flow.

Abstract: An internal rib for a blade airfoil has a concave surface defined to ensure durability and provide desired heat transfer. A concave surface faces a pressure side or suction side outer wall. A width is between a first end and a second end, and a depth is a length of a normal depth line between a midpoint of the concave surface and an intersection point of the depth line with the pressure or suction side outer wall. An irregular arc is defined within an arc angle centered at the intersection point, the irregular arc has a first arc radius equivalent to the depth at the midpoint of the concave surface and a second arc radius where the arc angle intersects the concave surface equivalent to a product of the depth and a shape factor. The shape factor has a substantially linear relationship with the aspect ratio.

Abstract: A bearing assembly for a centrifugal pump is configured to accommodate both forward and reverse axial thrust, and to be lubricated by process fluid. A pump incorporating a dual acting bearing assembly that is lubricated by process fluid and that is located between the final two impeller stages of the pump. A desalination system comprises a pump with an inlet for receiving seawater at a first end, an outlet for discharging high pressure seawater at a second end, one or more impellers coupled to a rotatable shaft between the first end and the second end for increasing a pressure of the seawater, and a bearing assembly lubricated by the seawater for absorbing axial thrust in both directions along the shaft.

Abstract: A water pump apparatus is provided having a plurality of modular components, which allows for construction of various configurations of the water pump apparatus depending on specific vehicle requirements. The water pump apparatus modular components include a pump housing with a fluid chamber formed therein, a bearing housing for attachment to the pump housing, and a thermostat housing for connecting to the bearing housing and the pump housing. A method for forming modular components for assembling a water pump apparatus for use in an internal combustion engine is also provided.

Abstract: A turbocharger housing has a valve device. The valve device is formed with at least one first duct section and a second duct section. The two duct sections are arranged with their longitudinal axes parallel to one another and they are formed without any undercuts.

Abstract: A lifting fixture assembly adapted for shipping and/or lifting includes a lower turbine casing having two horizontal joint flanges adapted to engage mating flanges on an upper-turbine casing. The horizontal joint flanges are provided with plural bolt holes used for securing the upper turbine casing to the lower turbine casing. A plurality of cross-beams extend transversely across the lower turbine casing, removably secured to said horizontal joint flanges, using selected ones of the existing bolt holes.

Abstract: A controller for varying flow rate of a fluid from a fixed displacement pump is provided. The controller includes a pump speed control gear set, a ratio control pump, and a relief valve. The pump speed control gear set includes a sun gear configured to be driven by a prime mover, a planet carrier including one or more planet gears meshed with the sun gear, and a ring gear meshed with the planet gears. The ring gear is configured to connect to an input shaft of the fixed displacement pump. The ratio control pump includes a stationary body, and a rotor coupled to the planet carrier of the pump speed control gear set. The rotor is configured to co-act with the body to pump fluid. The relief valve is connected to the ratio control pump and configured to restrict fluid egress from the ratio control pump.

Abstract: The present invention provides a method and apparatus of inhibiting a thrust bearing capacity of a compression system from being exceeded during a surge event in which a thrust bearing is biased with a biasing force to increase the thrust bearing overload margin between the capacity of thrust bearing to absorb axial forces and the greatest force produced during the surge event. This biasing force can be produced by appropriately sizing the high pressure seal on the side of the impeller opposite to the inlet of a compressor of the compression system so that the back disk force produced in the high pressure region of the high pressure seal and the low pressure region located inwardly of the high pressure region creates the desired bias force value and direction.

Abstract: A clamping ring (11) for the connection of two flanges includes an open ring section (17) which is designed for receiving the flanges (9, 10) to be connected. The flanges (9, 10) have ends connected by way of a clamping device (21-27) which is attached on the ring section (17). With the clamping device (21-27), the ends of the ring section (17) can be moved onto one another and thus the clamping ring (11) can be clamped amid the integration of the flanges (9, 10). The clamping device (21-27) includes a clamping force limitation device (27), in order to prevent an unintended failure of the clamping device (21-27) on assembly.

Abstract: A seal for use in a centrifugal pump, the pump having a stationary pump casing, a stationary plate and an axially adjustable side liner, is disclosed. The seal includes a base having an inner surface and an outer surface. A band portion extends from the base and a retainer member extends from the band portion. The retainer member is spaced apart from the base and oriented for positioning against a groove formed in the axially adjustable side plate liner of the centrifugal pump.

Abstract: A centrifugal blower assembly comprises a scroll wall and a pair of opposing sidewalls. The scroll wall is positioned between the pair of opposing sidewalls such that the scroll wall and opposing sidewalls together define a blower chamber and a blower outlet. A baffle element is positioned within the blower chamber and adjacent the blower outlet such that the baffle element is configured to facilitate uniform distribution of airflow downstream of the blower assembly. An air stream splitter is coupled to the scroll wall. The air stream splitter includes a spline member extending a varying distance from the scroll wall. The air stream splitter is positioned within the blower chamber to facilitate uniform airflow distribution within the blower assembly.

Abstract: A centrifugal compressor includes: a volute casing including a first casing and a second casing that are mutually coupled, the first casing including a volute chamber therein and the second casing including an impeller installation space therein; an impeller provided in the impeller installation space so as to be rotatable around a rotation axis; and a vaneless diffuser that has an inlet that communicates with an inside of the second casing and has an outlet that communicates with an inside of the first casing. The vaneless diffuser has a width having a non-axisymmetric distribution in the circumferential direction.

Abstract: A supersonic compressor rotor that includes a rotor disk that includes a substantially cylindrical endwall, a radially inner surface, and a radially outer surface. The endwall extends between the radially inner surface and the radially outer surface. A plurality of vanes are coupled to the endwall. The vanes extend outwardly from the endwall. Adjacent vanes form a pair and are spaced a circumferential distance apart such that a flow channel is defined between each pair of circumferentially-adjacent vanes. The flow channel extends generally radially between an inlet opening and an outlet opening. A first supersonic compression ramp is coupled to the endwall. The first supersonic compression ramp is positioned within the flow channel to facilitate forming at least one compression wave within the flow channel.

Abstract: A gas turbine engine includes a compressor assembly that is rotationally coupled to a shaft, the compressor assembly having a centrifugal impeller and a shroud covering a bladed portion of the centrifugal impeller. The compressor assembly includes a diffuser that is attached to the shroud via a pair of flanges, the diffuser including a strut that is mounted through an aft-extending leg to a base of an intercase. A sealing assembly is attached to the diffuser and is attachable to a transition duct that is positioned to receive air from the diffuser. The sealing assembly is configured to prevent air from passing through the sealing assembly while allowing relative motion to occur between the transition duct and the diffuser.

Abstract: A blower assembly including a motor, an impeller and a volute that is configured such that an inlet chamber of the volute and an outlet chamber of the volute are divided from one another by an airtight membrane and the membrane is configured to allow the transmission of pressure waves between the inlet and outlet chambers.

Abstract: A submersible pump, and method of making the submersible pump, is disclosed. The pump comprises a housing, a plurality of impeller stages serially disposed in the housing from a bottom impeller stage to a top impeller stage, an impeller stage bypass hole extending through one of the diffusers and a housing bypass hole extending through the housing radially outwardly from one of the impeller stages.

Abstract: The invention relates to a radial compressor (1) for an exhaust gas turbocharger, in particular of an internal combustion engine, with a compressor housing (2) comprising an axial inlet channel (3) and a radial outlet channel (4), with a compressor wheel (6) for delivering and compressing a gas, wherein the compressor wheel (6) has an axial inlet side (7) facing the inlet channel (3), a radial outlet side (8) facing the outlet channel (4) and an axial wheel surface contour (9), which extends from the inlet side (6) as far as to the outlet side (7), with an adapter element (10) which is substantially designed sleeve-like, which can be axially introduced into a fastening section (11) provided on the compressor housing (2), wherein the adapter element (10) at least in sections has a surface contour (13), which is designed substantially complementarily to the axial wheel surface contour (9), so that by axially moving the adapter element (10) in the fastening section (11) a gap width (w) of a passage gap (14) a

Abstract: An air diffuser device suitable for use in an air diffuser system for a centrifugal pump the pump including a pump casing with a pumping chamber therein, an impeller mounted within the pumping chamber for rotation about a rotation axis, the impeller including a front side and a rear side. The air diffuser system comprises one or more passages extending through the impeller from the front side to the rear side, the or each passage having a first opening at the rear side and a second opening at the front side of the impeller.

Abstract: A liquid ring pump is provided that includes an annular housing having an inner surface forming a housing cavity. The annular housing is filled with an operating fluid during operation of the pump. The operating fluid forms an eccentric liquid ring in the annular housing during operation of the pump. A rotor is disposed in the housing cavity and includes a plurality of rotor blades. A shaft extends into the annular housing into the housing cavity. The plurality of rotor blades extend radially outward from the shaft toward the inner surface of the annular housing. A liner formed from a corrosion resistant material is disposed substantially flush with at least a portion of the annular housing inner surface opposite a plurality of rotor blade ends.

Abstract: In one aspect, a method for manufacturing a part for a centrifugal slurry pump is provided, comprising: forming a skeleton of the part having an outer dimension smaller than the part; placing the skeleton of the part in a metal enclosure having an interior dimension larger than the outer dimension of the skeleton of the part and thereby forming a space; adding a metal matrix composite powder into the metal enclosure to fill the space; and subjecting the metal enclosure to hot isostatic pressing, thereby allowing bonding of the metal matrix composite to the skeleton of the part to form the part.

Abstract: A centrifugal fan according to a preferred embodiment of the present invention includes an impeller, a motor portion, and a housing. The housing includes an upper plate portion, a lower plate portion, and a side wall portion. The upper plate portion or the lower plate portion includes an air inlet. One of the upper and lower plate portions and the side wall portion together define a single housing component molded by casting. A portion of the one of the upper and lower plate portions which is along a boundary between the side wall portion and the one of the upper and lower plate portions defines an increased thickness portion arranged to have an axial thickness greater than that of a remaining portion of the one of the upper and lower plate portions.

Abstract: A cleaning and piston replacement kit for an accumulator of a vehicle transmission which includes a brush for cleaning, reconditioning and polishing worn accumulator bores and replacement pistons each of which includes a pair of sealing rings for supporting and spacing the replacement pistons from the accumulator bores to thereby prevent scrapping of the walls of the bores by movement of the pistons within the bores and a method of reconditioning the accumulator bore.

Abstract: A casing assembly for a compressor where traditional inlet and discharge nozzles are replaced with a mounting surface created from weld filler or weld material applied to the outside surface of a casing. The weld material and a portion of the outside surface of the casing are cooperatively milled to create a generally planar or flat surface having a casing conduit centrally-disposed therein. A flange may then be coupled to the flat surface for the inlet or discharge of a process gas.

Abstract: In a method of making a turbocharger housing surfaces of a sheet-metal shell which bound a gap towards the turbine wheel are measured, after the sheet-metal shell has been joined with a bearing flange provided for support of a turbine wheel, to generate measuring values. Subsequently, the bearing flange is machined in dependence on the measuring values for establishing a position of the turbine wheel in relation to the bearing flange and thus of the sheet-metal shell.

Abstract: A submersible pump housing with seal bleed ports is provided. In an implementation, a pump housing for electric submersible pumps (ESPs), such as a centrifugal ESP, has end seals that are located inside or further inboard toward the high thrust pressure generated by the pump, than the threaded ends of the pump housing. The inboard seals contain and seal off the pump pressure and spare the threaded regions that are more pressure-vulnerable from the pump's high pressure interior, thereby increasing the pressure rating of the entire housing. Leak ports or bleed ports are provided further outboard of the end seals to relieve fluid seeping from inside the submersible pump housing past each end seal. A plate may be added to direct small amounts of fluid escaping from the end seals away from the wellbore casing in which an ESP is situated.

Abstract: A method for the production of a piston for an internal combustion engine, having a circumferential cooling channel, whereby a blank of a lower piston part is forged, and a blank of an upper piston part is produced, the blanks are pre-machined and joined together to form a piston blank, which is finished to produce a piston. At least one depression or recess is formed into the blank of the lower piston part during the forging process. In the finished piston, the depression forms an opening for a coolant inflow and/or a coolant outflow, or the recess forms an excavation groove for a pin securing ring, respectively.

Abstract: A centrifugal compressor includes an impeller, a casing, an impeller housing portion, an inlet port, an annular flow passage provided around the impeller, a discharge port communicated with the annular flow passage, an annular chamber provided around the inlet port, a downstream slot communicating a downstream end of the annular chamber with the impeller housing portion, and an upstream slot communicating an upstream end of the annular chamber with the inlet port. The downstream slot draws a one-cycle curved line pulsating in an axial direction of the inlet port. A most upstream point of the downstream slot is located at an upstream end portion of impeller blades of the impeller when seen along a direction perpendicular to a rotary shaft of the impeller. According to the centrifugal compressor, it becomes possible to expand its operating range by improving a surging restriction effect brought by more effective casing treatment.

Abstract: A compressor impeller includes a hub, main blades and splitter blades. The main blades are equally spaced around the circumference of the hub. Each splitter blade is equally spaced between two adjacent main blades. Each main blade and splitter blade has suction and pressure surfaces formed in substantial compliance with normalized Cartesian coordinate values of X, Y, and Z set forth in Tables 1-4. When connected by smooth, continuing arcs, the normalized Cartesian coordinates form complete main blade and splitter blade shapes that are substantially matched by the main blade and splitter blade shapes of the compressor impeller.

Abstract: A method of manufacturing a pump assembly includes sand casting a pump housing with a cavity and die casting an impeller that includes pump blades and a first portion of a shroud. The pump housing may be sand cast as a one-piece component and the impeller may be die cast as another one-piece component. A pump cover is provided with a second portion of the shroud. The pump cover is inserted into the cavity so that the second portion of the shroud is adjacent to the first portion of the shroud, providing a substantially continuous surface defining flow channels through the impeller. A pump assembly manufactured according to the method is also provided.

Abstract: A centrifugal blood pump reliably prevents blood from entering between an impeller and a shaft member. Pump 1 includes a pump chamber 24, a housing 2 including a blood inlet 25 and a blood outlet 26, an impeller 3 as a centrifugal force applying member rotatably encased in the pump chamber 24 and applying a centrifugal force to the blood Q by the rotation of the impeller 3. A support mechanism 4 supports impeller 3 rotatably with respect to the housing 2. The support mechanism 4 includes a rod-shaped shaft member 41 disposed at the rotation center of the impeller 3. Shaft member 41 and the impeller 3 are formed integrally with each other, as by insert molding.

Abstract: Durable pumps for abrasives are provided. An example centrifugal pump stage for subsurface operation has a thrust washer located inside the circumference of an outboard clearance seal between an impeller shroud and the diffuser. Relocation of the thrust washer allows the clearance seal to protect the thrust washer from abrasives. A centrifugal action of an outboard seal lip effects a separation of the particles from the fluid nearest the gap of the outboard seal and drives the particles away from the gap of the outboard seal. When an abrasive particle in the leakage flow does clear the outboard seal, the particle is readily flushed across the thrust washer by the leakage flow to the central fluid inlet to prevent wear of the thrust washer. In an implementation, the inside diameter of the thrust washer is approximately flush with the bore of a central fluid inlet of the pump stage.

Abstract: A method for manufacturing a turbocharger (1) with variable turbine geometry (VTG), having a turbine housing (2) with a feed duct (9) for exhaust gases; a turbine rotor (4) which is rotatably mounted in the turbine housing (2); and a guide grate (18) which surrounds the turbine rotor (4) radially at the outside, which has a blade bearing ring (6), which has a multiplicity of guide blades (7) which have in each case one blade shaft (8) mounted in the blade bearing ring (6), which has an adjusting ring (5) operatively connected to the guide blades (7) via associated blade levers (20) fastened to the blade shafts (8) at one of the ends thereof, each blade lever (20) having at the other end a lever head (23) which can be placed in engagement with an associated engagement recess (24) of the adjusting ring (5), and which has a stop (25) at least for setting the minimum throughflow through the nozzle cross sections formed by the guide blades (7).

Abstract: A disclosed centrifugal boost pump volute includes normal to flow cross sectional surfaces distributed over the length of the passage. The volute includes a volute proper, an exit bend and a diffuser fluidly interconnecting the volute proper to the exit bend. The cross sectional surfaces are defined as dimensions set out in one set of data, which includes Tables N-1 and N-2 for the volute proper and Table N-3 for the volute exit bend, where N is the same value.

Abstract: A centrifugal pump including a rotor and a housing surrounding the rotor, the housing having a connection on the pressure side and another on the intake side, respectively. The housing surrounding the rotor is constructed as a composite part in which a first thin-walled layer (5) defines the inner configuration of the housing, and at least one second layer (11) provides structural stability to the housing.

Abstract: A turbocharger assembly includes: a housing with a through-bore and a cross-bore that intersects the through-bore to define an upper portion of the cross-bore with a first diameter and a lower portion of the cross-bore with a second diameter where the first diameter exceeds the second diameter; a bearing disposed in the through-bore of the housing where the bearing includes a through-bore configured to support a shaft and a cross-bore that intersects the through-bore; and a locating pin with a diameter that exceeds the second diameter of the lower portion of the cross-bore of the housing, the locating pin press-fit at least partially into the lower portion of the cross-bore of the housing and disposed at least partially in the lower portion of the cross-bore of the bearing to locate the bearing in the through-bore of the housing. Various other examples of devices, assemblies, systems, methods, etc., are also disclosed.

Abstract: A scroll or torus has a variable thickness and variable radius structure rib support. The scroll or torus may be suitable in high temperature applications while avoiding the high stress found with conventional constant radii ribs and the weight penalty found in stainless steel scrolls and torus. The scroll or torus may be used, for example, on a turbo compressor machine in aircraft environmental control systems.

Abstract: An exemplary air cycle machine bearing housing includes a housing establishing a bore that receives a bearing. The bearing rotatably supports an air cycle machine shaft. The bore has an axial length and a radial diameter. A ratio of the axial length to the radial diameter is from 0.6989 to 0.7128.

Abstract: A volute shaped pump casing for a centrifugal pump includes a chamber for housing at least one impeller rotatable around an axis of rotation and a volute shaped chamber which forms a flow channel and which contains a splitter rib for dividing the flow channel formed wherein in a section perpendicular to the axis of rotation a mean camber line is positioned equidistantly between an inner and outer surface of the splitter rib, where the thickness of the splitter rib is varied along the mean camber line and for the mean camber line unwrapped to a straight line there is a maximum in the thickness, s, of the splitter rib, wherein said maximum is positioned at a distance L from the leading edge of the splitter rib, and wherein the distance L is in the range between 1.4 times the maximum thickness s and 6 times the maximum thickness s.

Abstract: An exemplary shaft assembly of an air cycle machine includes a cylindrical body rotatably coupling a compressor rotor, a turbine rotor and a fan rotor. The cylindrical body has an axial length and a diameter. A ratio of the axial length to the diameter is from 34.82 to 35.18.

Abstract: A method is provided for producing a blade, by casting, for a gas turbine. The blade includes an elongate airfoil which extends in a blade longitudinal direction, merges into a blade root at the lower end, has a shroud segment at the blade tip and is pervaded by a single cooling air channel running in the blade longitudinal direction from the blade root to the blade tip. The method includes, during the casting of the blade, the blade material being fed exclusively from the blade root into the mold provided therefor, and the cooling air channel is formed during the casting of the blade by using a single core body, which is provided, at the blade tip, with a local casting cross section increasing element.

Abstract: A compressor housing is provided with a scroll piece that includes a cylindrical intake port forming section that forms an intake port, a scroll wall surface forming section that forms an air-intake side wall surface of a discharge scroll chamber, and a scroll outer circumferential section that covers an outer circumferential side of the discharge scroll chamber; a shroud piece that includes a cylindrical shroud press fitted section press fitted into the intake port forming section, and a shroud wall surface forming section that forms an inner circumferential side wall surface of the discharge scroll chamber and also forms a shroud surface that opposes an impeller and a diffuser surface; and an outer circumferential annular piece that includes an outer circumferential annular press fitted section that is press fitted inside the scroll outer circumferential section, and an outer circumferential annular wall surface forming section that forms an outer circumferential side wall surface of the discharge scroll ch

Abstract: A turbocharger includes a variable-nozzle assembly that includes an insert having a tubular portion received into a stepped bore of a turbine housing and having a nozzle portion extending radially out from one end of the tubular portion, and a generally annular nozzle ring axially spaced from the nozzle portion and an array of vanes rotatably mounted to the nozzle ring. Sealing of the interface between the tubular portion of the insert and the turbine housing is provided by a sealing ring formed as a generally annular body having a U- or V-shaped cross-section oriented such that an open side of the U- or V-shaped cross-section faces in a radial direction. The U- or V-shaped cross-section defines two opposing legs, one of the legs being engaged against an end face of the tubular portion of the insert and the other leg being engaged against an upstream-facing step surface of the turbine housing bore.

Abstract: Disclosed herein is an apparatus for an immersible pump. The apparatus can include a shaft for communicating with a motor. The shaft includes a first region having a first diameter, a second region having a second diameter that is less than the first diameter, and a tapering region between the two regions. A sleeve can be provided to receive the shaft. A sealing device includes a receiving area in which the tapering region is at least partially positionable to form a seal, and an abutment that is configured to form a seal with the sleeve and that is responsive to a force directed from the sleeve to enhance the seal with the tapering region. In some embodiments, the sealing device is provided with a circumferential outer wall for centering the sleeve about the shaft and/or for aligning the force with the abutment.