Abstract: The present invention relates to a sealed centrifugal pump used for delivering special liquids and that overcomes the limitations of well-known canned or sealed motor pumps, including relatively short service life of the bearings and unsuitability for delivering liquids or fluids containing tiny particles or contaminents by means of a new type of structure in which the bearings, which are working in liquid phase, are isolated from the pumped fluid medium. This enables ball bearings to be used as the support of the canned motor, the use of lubricating oil and grease for the ball bearings, and the forced cooling of the lubricant and bearings other than by the pumped fluid, so that the service life of the whole pump unit has been increased, and the delivery of liquids containing tiny particles is enabled.

Abstract: A radial piston pump in which an annular coupling device (10), whose axially directed extensions (11) each engage a working piston, has a preset break point (15) in the area of the axial extensions (11).

Abstract: An end stop is disclosed for limiting the maximum displacement of a flexible member so as to minimize stress on this member and thus provide an extended surface life. The flexible member is rigidly supported at at least two spaced-apart points such that the flexible member can flex in the region between these points. The end stop includes a support member for clamping the flexible member at the two supporting points and a wall surface arranged in opposed, facing relationship to the flexible member in the region between the two points. The curvature of the wall surface is defined by first and second curves that form a continuous curvature and have first and second derivatives of the local angle .phi. of the tangent to the curve with respect to the distances along the curve which are zero.

Abstract: An inherently flushing piston rod is provided for use with a reciprocating pump. A piston rod having a rod portion and a piston portion is mounted for reciprocating movement within the housing of the reciprocating pump. An axial bore is defined through the piston portion and the rod portion and fluidly connects the external environment of the rod portion to an internal chamber within the piston portion. Throughout the stroke of the piston, a flushing fluid is inherently drawn through the axial bore and into the internal chamber of the piston portion, and is subsequently delivered to a flushing space defined about the perimeter of the piston portion.

Abstract: A centrifugal oxygenator pump includes a bottom inlet into an impeller chamber, the bottom inlet having a venturi gas inlet for mixing gas with the in flowing liquid. The impeller chamber is of a frusto-conical shape within which is rotatably mounted a similarly shaped mismatched impeller, the impeller driving the liquid and gas mixture toward a toroidal outlet chamber and through an outlet to an outlet nozzle. The motor drives the impeller to attain a high specific speed so that an increased capacity and larger size oxygenator is provided with maximum efficiency and effectiveness.

Abstract: A downhole bladder pump for pumping ligher-than-water liquids. The pump includes an outer tube closed at its bottom and top, but having slots adjacent its upper end to admit the liquid to be pumped. Positioned concentrically within the outer tube is a cylindrical bladder chamber. A cylindrical bladder is mounted within the bladder chamber and registers with the internal surface of such chamber. A cyclically-operated pneumatic control system periodically delivers pressurized air to the space between the bladder and the bladder chamber to collapse the bladder and pump liquid which has flowed into the bladder. At other times during the cycle, the control system draws the bladder outwardly against the internal surface of the bladder housing by the application of vacuum. The liquid to be pumped is then forced into the bladder through a check valve subassembly positioned in the lower end of the bladder housing.

Abstract: A fuel drain system for use in a fuel pump for an aircraft fuel tank or the like which includes a housing and a pump cartridge positionable in the housing for removal therefrom. A drain plug is removably mounted on and projects from the pump cartridge for draining residual fuel from the cartridge prior to removal of the cartridge from the housing. A stop is located in a path of movement of the projecting drain plug to prevent removal of the pump cartridge from the housing unless the drain plug is removed from the pump cartridge. This provides for verification that the main inlet closure to the fuel pump has been closed and, thus, prevents massive fuel leakage.

Abstract: A water pump used in a cooling system for an internal combustion engine includes a pump shaft fixedly connected to an impeller means and detachably connected to a driven gear. The driven gear is in meshing engagement with a drive gear which is detachably mounted on a cam shaft rotated by the engine. The two shafts are not axially aligned, but are arranged in parallel relationship with each other. Thus, the optimum rotational ratio between the shafts may be obtained by adjusting the radii of the gears.

Abstract: Liquid is applied to a wire rope by passing the rope through an elongated casing in which liquid is sprayed against the rope, excess liquid being discharged through annular grooves containing discharge openings upstream and downstream of the liquid inlet. Air is blown against the rope upstream and downstream of the annular grooves and discharge openings for causing the liquid to be discharged through such openings and not through the ends of the casing.

Abstract: A multiple magnet drive pump is disclosed, which includes a driving magnet having opposite polarities circumferentially spaced apart from each other, a plurality of driven magnets on a circumference of the driving magnet for rotation in a non-contact state therewith, and a plurality of pump sections each having the driven magnet incorporated into a rotor for a pumping operation.

Abstract: Apparatus for converting high pressure, low volume air to low pressure, high volume filtered air in order to successfully atomize fluids, such as paint, of various viscosities. The invention makes it possible to utilize safe, economical compressor air to atomize fluids by a portable enclosure including a variable jet venturi induction pump which separates the pump from the area of application and other potentially contaminating elements. Ambient air is introduced into the portable enclosure after regulation and filtration. A low pressure field is established in the induction pump by increasing the velocity of the compressor air in a venturi section of the pump but is free of contaminates generated, for example, by overspray in the vicinity of the area of application.