Abstract: A pump having a generally hollow housing, an annular rotor rotatively mounted inside the housing, an annular stator fixedly mounted inside the housing and peripherally surrounding the rotor and a closed impeller axially aligned with the annular rotor. The impeller includes a tubular fluid inlet member fixedly mounted within the annular rotor, such that the rotor rotatively drives the impeller.

Abstract: A pump impeller of a centrifugal or a half axial type meant to pump liquids, mainly sewage water. The pump impeller has a hub (4) provided with one or several vanes (5) the leading edges (6) of which being strongly swept backwards. The periphery (8) of the leading edge is displaced 125-195 degrees relative to its connection (7) to the hub (4).

Abstract: An apparatus for providing indication of valve position of a manual valve is disclosed for a valve having a rotary, operating assembly journaled in a housing, the operating assembly comprising a handwheel, a bushing fastened to the handwheel, and a spindle threadedly engaged to the bushing to cause translation of the spindle in response to rotation of the handwheel and the bushing, the apparatus for enclosure in the housing comprising a hub coupled to the bushing for transmitting rotary motion in response to rotation of the bushing; translation means for translating the rotary motion into an electrical signal; and circuitry means responsive to the electrical signal for indicating position of the valve.

Abstract: The invention concerns a cooling device for an electrically driven mixer operating in hot liquids.The motor (1) is surrounded by a cooling jacket (5) having inlet (8) and outlet (9) for cooling medium.The jacket (5) is provided with a concentric partition wall (6) which devide the room inside the jacket into two gaps (7) and (8) respectively of different widths.

Abstract: A pump housing has a plurality of chambers formed therein, and a shaft journaled within, the shaft having impellers keyed thereto. Each chamber has one of the impellers disposed therein. One of the impellers is the primary liquid-working element, and has rigid vanes. The vanes are generously spaced apart from the enclosing chamber walls. A second impeller has flexible vanes, and serves as a priming element; it has an intimate fit in its chamber and cooperates with an outlet flapper valve to create a negative pressure in the liquid inlet. Consequently, the pump can self-prime even when absolutely dry.

Abstract: Guide rails, projecting axially from a housing section flange, are received in apertures provided therefor in a mating housing section flange, whereby the latter will be concentrically directed, into engagement with the former. Each housing section contains a magnet-carrier assembly which, otherwise, would be magnetically attracted to the other, and occasion damage or injury during assembly or disassembly. The rails prevent radial dislacement of one of the assemblies relative to the other thereof. In addition, jacking screws are interposed between the flanges to insure that magnetically-induced impacting engagement will not occur between the flanges.

Abstract: A pressure sensor is electronically corrected for inherent and temperature induced errors. The sensor is characterized with a four term, third order equation. The sensor behavior coefficients for the four terms are themselves each characterized with a three term, second order equation that tracks how the four coefficients change with respect to temperature. The temperature effect coefficients for the three terms in each of the four equations, twelve coefficients in all, are stored in memory. In operation, a microprocessor measures the temperature, retrieves the 12 temperature effect coefficients, solves the four second order equations to obtain the four sensor behavior coefficients, solves the third order equation using the four sensor behavior coefficients and the sensor output to yield the true pressure. In this way, the full spectrum error map of the pressure sensor can be remembered with just 12 coefficients using only 72 bytes of onboard memory.

Abstract: Simple, narrow bands are secured to a generally planar platform, and joined together, above the platform, by a tether-attaching bolt. The bolt mounts a lifting eye for a hook and tethering cable. One of the bands and the platform, receive mixer-mounting bolts for replaceably fixing the mixer on the platform. To inhibit unwanted migration of the apparatus across the bottom of a liquid-confining tank or reservoir, the platform has pointed-end feet depending therefrom, and removable weights are set atop the bands, whereat the latter are joined together.

Abstract: Clutch apparatus with a rotary inner member having a plurality of equally spaced indents. An outer member has a plurality of equally spaced flexible beam members on its inner peripheral surface, each of said members being adapted to engage one of said plurality of indents. When either the inner or outer member is subject to an overload condition, said beam members flex radially outward and slip from one indent to another.

Abstract: A submersible mixer support system for use in sewage treatment systems and the like has parallel tubular guide bars supporting at least one mixer stand unit having a slow rotation, large propellered mixer thereon. The mixer stand unit is releasably clamped to the parallel guide bars by clamping units each having a horseshoe-shaped resilient clamping block deformable when a clamping pressure is applied thereto by a preload assembly located remotely therefrom. The mixer support system facilitates removal and servicing of the various subassemblies located thereon.

Abstract: Pure glass is prepared in a water-cooled radio frequency heated silica crucible. An encapsulated graphite susceptor is used to preheat the glass batch material to avoid contamination. The preheater is removed after the r.f. power becomes effective to couple into the melt. The cooling prevents the melt from wetting the crucible and eliminates a further source of contamination.