Abstract: A seal assembly for sealing a volatile liquid from escaping past a rotating shaft mounted within a housing, includes a rotating sealing ring having a seal facing keyed to the shaft and a stationary sealing ring having a seal facing mounted to the housing. The seal facing of the stationary sealing ring is in contact with the sealing facing of the sealing ring keyed to the shaft when the shaft is non-rotating. When the sealing ring is rotated by the shaft the seal faces are disengaged from one another. One of the seal facings of either the rotating or stationary sealing ring includes a plurality of notches positioned on the outer radial edge of the sealing surface at an angle of approximately 45.degree. with respect to the perpendicular peripheral surface of the sealing ring.

Abstract: A pump assembly is disclosed having a housing including a suction inlet and a discharge outlet and a pump assembly contained within the housing. The pump assembly includes a pumping stage and a driving stage, with the pumping stage including an impeller assembly constructed and arranged to impart regenerative action flow to the fluid being pumped. The driving stage includes a magnetic drive comprised of a drive magnet and a driven magnet associated with a shaft operatively coupled to the impeller assembly, with the driven magnet positioned with in a sealed containment vessel. A portion of the pumped liquid is circulated as a coolant through the containment vessel and returned to the pumping stage. A control assembly is provided to monitor the differential temperature of the magnetic drive and the bearing structure within the magnetic drive to control operation of the pump assembly.

Abstract: A regenerative turbine flow inducer for moving lubricating fluid through a seal chamber of a bearing assembly for lubricating sealing surfaces includes a turbine impeller rotated by the shaft and a pair of liners which enclose the impeller, the liners defining fluid inlets on both sides of the impeller, which are communicated with a source of lubricating fluid, and a fluid discharge outlet, the liners containing lubrication fluid supplied thereto and directing the fluid to the impeller as the impeller is rotated, drawing lubrication fluid through the liners. The regenerative turbine flow inducer may be used with double or tandem mechanical seals.

Abstract: A floating, self-centering impeller for a turbine pump assembly has a plurality of "D-shaped" recesses arranged in one or more circumferential rows on its end surfaces to induce pressurized film between its end surfaces and adjacent thrust surfaces of side plates to prevent galling or seizing of the pump as the impeller is rotated. A corresponding array of such "D-shaped" recesses may be provided on the opposing surfaces of the side plates.

Abstract: A multi-stage pump embodying a casing having two elongated end sections disposed on opposite sides of an intermediate discharge section and secured thereto, the end sections being of modular construction and embodying a plurality of axially aligned casing rings having impellers rotatably mounted therein, the casing rings being removably mounted relative to each other and, together with the impellers disposed therein, each comprising a respective stage for the pump, the end sections of the casing each having a passageway, including the interiors of the casing rings, for feeding liquid inwardly through the outer ends of the end sections of the casing and discharging the liquid into the aforementioned intermediate discharge section for discharge from the pump, during rotation of the impellers.

Abstract: A multi-stage pump embodying an inner housing of modular construction and embodying a plurality of axially aligned casing rings having impellers rotatably mounted therein, the casing rings being removably mounted relative to each other and, together with the impellers disposed therein, each comprising a respective stage for the pump, with an outer housing mounted around the inner housing, in spaced, surrounding relation thereto to thereby afford an annular space between the inner and outer housings, with end sections being releasably secured to opposite ends of the outer housing in position to clamp the modules of the inner housing together, and with a passageway through the pump being afforded by the casing rings, the impellers, a radial opening through one end of the inner housing, the space between the inner and outer housings, a radial opening through the outer housing and a connector in communication with the last mentioned opening.

Abstract: A centrifugal impeller for use in a combination centrifugal-turbine pump capable of pumping liquids at or near the boiling point thereof with suction heads not greater than about one foot and wherein the entrance portion of the centrifugal impeller includes a plurality of vane inserts removably mounted therein, with adjacent ones of the inserts having vanes that are aligned with each other to define liquid-feeding spiral vanes that extend through the plurality of inserts.

Abstract: A centrifugal impeller for use in a combination centrifugal-turbine pump capable of pumping liquids at or near the boiling point thereof with suction heads not greater than about one foot and wherein the entrance portion of the centrifugal impeller includes one or more of vane inserts removably mounted therein, with adjacent ones of the inserts having vanes that are aligned with each other to define liquid-feeding spiral vanes that extend through the plurality of inserts.

Abstract: A floating seal embodying a tubular bushing non-rotatably mounted in a tubular housing having a radially inwardly projecting flange on one end thereof, the bushing having an annular recess formed in the outer annular corner thereof which faces the aforementioned flange, with an O-ring mounted in the recess between the bushing and the aforementioned corner, with the bushing being movable axially of the housing, by pressure applied to the end of the bushing remote from the aforementioned flange, into position to compress the O-ring between the surface of the bushing defining the recess and the inner surfaces of the housing and flange defining the aforementioned corner.

Abstract: A floating annular sealing ring having a plastic coated surface is adapted to be received by an annular groove defined by a bushing and shaft sleeve mounted upon a rotating shaft to provide an effective liquid and gas seal. The encapsulated deformable annular seal may include a circular, an oval, a lobed, a rectangular, a square or triangular cross-section, which cross-section is capable of conforming to the inside surface of the bushing sleeve and the outside surface of the shaft when the sleeve is moved axially towards the bushing to thereby deform the encapsulated floating annular seal to provide a mechanical seal between the rotating shaft, sleeve and bushing.

Abstract: The segmented casing has a plurality of successive stage casing rings, a transfer plate intermediate each adjacent pair of casing rings, a suction end casing section, and a discharge end casing section. A shaft extends axially through the casing, and is supported and sealed at its ends by demountable bearing and seal means. Each casing ring encloses a complete stage containing an impeller which is spring biased into engagement with a locating collar secured to the shaft, and a pair of replaceable liners which are arranged at the opposite sides of each impeller. Each casing ring, impeller, set of liners, locating collar, and spring means, together comprises a module which functions as one stage of the pump. A pump is comprised of two or more modules which are connected internally by a shaft and externally by draw bolts, and which are contained by the suction and discharge end casing sections. Suction and discharge connections are demountably secured to the casing in any one of several rotative positions.