Abstract: A method to control stops of an intermittently operating electric motor that drives a submersible pump arranged in a pump station for sewage water, wherein starts and stops of the motor depend on the water level in the pump station or on any other electric parameter possible to measure, and where a stop of the motor is initiated when the water level has gone down to the upper part of the motor. The method involves the steps of selecting intervals for pumping down to a level below that of the upper part of the motor where the pump starts sucking air, and pumping down to the lower level at each of the selected intervals until the pump starts sucking air.

Abstract: The invention concerns a seal housing for a mechanical seal device. The seal device is arranged within a cavity (6) provided with a spiral notch (11) at its mantle surface for feeding particles in the liquid in a direction away from the seal means (7) and toward an impeller. The spiral notch opening axially toward the impeller.

Abstract: A device (10) for manipulating submerged-operating units (11), such as submersible motor-driven pumps, submersible motor-driven stirrers and the like, has a hoist, by means of which the unit (11) can be brought into a submerged working position and a surfaced maintenance position, wherein the unit (11) is provided with a lifting strap (25) of a coupling unit, whose coupling element (60, 60'), which can be brought into and out of engagement with the lifting strap (25), is provided on a pulling element (48) of the hoist.

Abstract: The invention concerns a device for mounting and keeping together parts in a submersible pump unit.Two groups of screw joints (15) and (16) respectively are alternatively arranged around the periphery of the pump unit, the first group of said joints (15) connectings the stator housing (8) and the seal housing (4) via a ring (13), while the other group of joints (16) connect said ring (13), said pump housing (5) and a cooling jacket (10) surrounding said stator housing (8).

Abstract: A closed, hollow body has a suspending and tethering, electrical cable joined thereto, the latter conducting electrical power to and from a microswitch confined within the body. A switch actuator is engaged and disengaged by a weight, within the body, the weight being pivotably supported therein, and having a center of gravity which is offset from a central, longitudinal axis of the sensor.

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 waste water pump station is provided for two submersible pump units which are attached to connection units on the station wall or on a shelf of the wall. The two connection units are attached in a reversed manner with respect to one another making it possible to mount them very close to the wall.

Abstract: The invention concerns a device for installation of a mixer in a water tank. The mixer is arranged on the inside of a cover (4) in the tank wall (2) which means that only the electric connection means to the motor have to be sealingly drawn through the wall.

Abstract: A valve housing has a chamber formed therewithin, and an inlet and an outlet for accommodating fluid flow through the chamber along a given flow path. The housing further confines a free ball therein, and hydraulic-fluid filed compartments with flexible walls. Intermediate the inlet and outlet, the housing has a valve seat formed. Fluid pressure in the chamber causes one compartment to collapse and the flexible wall of the other to expand. The expanding wall, and capturing fluid flow, moves the ball to the seat to halt flow through the chamber, after an initial period of free flow. The method comprises providing the chambered housing, disposing the ball in the chamber, communicating the inlet with a pump outlet, and confining the flexible-walled compartments in the chamber.

Abstract: The inlet part of the pump housing includes a collar which concentrically surrounds a corresponding opposite collar formed part of the pump impeller inlet, thus permitting any possible leakage flow to be in parallel with the main flow into the impeller and minimizing the disturbance in the main flow. In order to minimize the leakage flow, an O-ring is arranged in front of the opening to a slot between the parts.

Abstract: Notches in the impeller cooperate with balancing holes therein, and a liquid-receiving slot, to direct liquid across the leading edges of impeller vanes to flush away any accreted substances therefrom. In addition, a large diameter deflector coupled to the hub of the impeller also cooperates with the notches to deflect the flushing liquid in the direction of the main liquid flow through the impeller.

Abstract: A length of non-corroding, filamentary material penetrates a lifting bail of the submersible equipment, and one end of the material is coupled to a hook, while the opposite end is pulled to cause the hook to snare the bail. The hook is held in suspension, but moved into proximity to the bail to enable the material to be drawn through the bail, and to cause the hook to engage the bail for sub sequent lifting of the equipment.

Abstract: A cavity in the housing, which confines the seal therewithin, has an annular wall surface which is modified to direct liquid from the cavity towards the impeller. In one embodiment, the wall surface has a helical land formed therein. In another embodiment, a helical-land forming insert is set within the cavity and in engagement with the wall surface.

Abstract: Upper and lower housing portions combine to define a fluid-working area within the housing, and the portions are dissimilar. The lower housing portion is substantially circular, having a constant radius, whereas the upper housing portion is volute-shaped, having an increasingly extending radius and a continuously growing depth, in the direction of the outlet. Correspondingly, the lower housing portion has a continuously diminishing depth, in the direction of the outlet.

Abstract: One end of a dual-ended housing is closed off by a plug formed of a first constituent which is a water-soluble material and a second constituent which is a thermosetting resin and forms a readily-frangible structure in the plug. An electrical switch which has an actuating plunger is set, in the housing against the plug, so that the latter holds the plunger depressed/retracted. Moisture expands the water-soluble material which, in turn, destroys the plug integrity and, subsequently, the plug is so weakened that the plunger breaks through the frangible structure to actuate the switch.

Abstract: The tank has vertical walls joined to a horizontal bottom with a diagonal wall bridging between an intermediate portion of one of the vertical walls and the bottom. The diagonal wall has an access opening formed therein, and it cooperates with the one vertical wall and the bottom to form a sheltering recess, in the tank, for pumping station components. The pumping station has the relevant components emplaced in the tank, and sewage water admitting and discharging facility, with a submersible pump and water-handling piping. Station components, and portions thereof, are sheltered in the recess of the tank, to accommodate an optimum water flow in the tank, and to minimize an entanglement of solid objects with the components.

Abstract: The invention concerns a device for pump housings for centrifugal pumps for pumping of polluted liquids. In order to decrease the influence of radial force acting upon the impeller during operation, a partition wall (5) is arranged along a part of the turn in that part of the spiral formed pump housing that has the biggest diameter. In order to decrease the risk that pollutions will stick to the wall (5), it is split up into two parts (6) and (7) with an intermediate, longitudinal slot (10). The leading edges of said parts (6) and (7) are swept backwards into the slot (10).

Abstract: The hub is conically formed, and the vanes attached thereto are given a substantially radial direction; consequently, the turning axes of the vanes are situated in the center of the vanes, substantially bisecting the center of the vane chords. The turning axes are perpendicular to the impeller shaft.

Abstract: Atop the impeller are ancillary vanes, the same provided for pumping cooling liquid to the centrifugal pump motor cooling system. The liquid is conveyed through a narrow slot, vertically, which obtains between an annulus of the pump housing and an impeller extension. Grooves, contiguous with inner tips of the ancillary vanes, and formed in the extension, widen the slot, cyclically, coincident with rotation of the impeller, and hasten deaeration of air bubbles which exist, at start-up, between the impeller and the pump housing.