Abstract: The invention relates to a pumping system for applying a sufficient pressure increase to multiphase effluents for them to be conveyed from a source such as an petroleum producing well to a remote destination point. To improve pump function and render management of effluent transfers more flexible, the system has a loop (7) for recycling a fraction of the multiphase effluents leaving pump (1) to the inlet thereof, comprising preferably a tap (5) such as a T formed to decrease the volumetric ratio GLR of the recycled effluents. A regulator such as a control valve (8) and a buffer tank and an element (9) such as an ejector-mixer are interposed in the loop to use part of the energy of the effluents tapped off. The invention has application for offshore pumping facilities.

Abstract: A compressed air-actuated pump includes a venturi nozzle (24) to create a vacuum condition within a fluid-tight pump body or chamber (8) to pump in a liquid or slurry from a remote location. When a given level of liquid is pumped in, a float mechanism (69, 97, 101) actuates a magnetic air valve (60) which actuates a diverter valve (40) whereby the pressurized air from the venturi nozzle is diverted into the pump body to create a pressurized condition therein, whereby the liquid or slurry previously accumulated therein is pumped out. The magnetic actuated valve and diverter valve controlled thereby insures that the desired amount of liquid or slurry is always discharged from the pump chamber during each pressure cycle, and drawn into the chamber during the suction or fill cycle.

Abstract: An apparatus for recovering fluid from a liquid formation includes a submersible pump for pumping fluid from the liquid formation. The submersible pump is coupled to an eductor defining a fluid member for receiving and transporting the fluid from the pump, and a fluid inlet in fluid communication with the fluid member for placement at a liquid-product layer in the formation. A probe assembly is coupled to the eductor for ensuring that the pump is inoperative when the fluid level in the formation is low. In operation, a motive force created by the upward flow of fluid pumped through the fluid member draws additional fluid into the fluid inlet from the liquid-product layer. The fluid entering the fluid inlet merges with the fluid flowing through the fluid member and is transported to a treatment facility.

Abstract: A vacuum aspirator apparatus uses circulating water from a reservoir while avoiding or reducing temperature rise in the circulating water. The apparatus consists of a reservoir with aspiration and cooling circuits, both of which are external to the reservoir, the aspiration circuit containing one or more aspirators with vacuum ports at which a vacuum can be drawn.

Abstract: A pump in which a valve bridges the pressure region and the suction region and the delivery system displaces liquid from the suction region to a pressure region. The pump housing has an annular channel connected to the suction or intake passage and into which an injector extends to train a jet from the high pressure side a the valve into the suction region through the channel which surrounds the injector so that the jet asperates liquid from the channel into the suction region.

Abstract: A pump (10) for providing water from a source to a remote location includes a casing (11) which receives the water through an inlet port (22) which is provided to the remote location through a discharge port (20). An impeller (30) in the casing (11) is rotated by a motor (23). A diffuser (35) is positioned adjacent to the impeller (30) and has a shoulder (42) facing the inlet port (22). A nozzle (44) is mounted in the inlet port (22) to receive low pressure water from the source which is transmitted to a venturi tube (43) positioned between the diffuser shoulder (42) and the front wall (16) of the casing (11). The venturi tube (43) directs water to the impeller (30) and diffuser (35) which provide water at high pressure, upon demand, through the discharge port (20) and also recirculates high pressure water in the casing (11) to the venturi tube (43) through openings (51) in the wall thereof.

Abstract: A pumping apparatus for pumping a gas having application to helium leak detectors has a vane and oil-seal type vacuum pump immersed in a closed tank (9) partially filled with oil (10). The apparatus also includes an oil pump (20) for renewing the oil seal located inside the tank. The oil pump is equipped with a noise-reducing mixing device enabling the oil for constituting the oil seal to be mixed with a noise-reducing gas. The noise-reducing gas is fed from the outside of the tank to the mixing device by means of a pipe (24) passing through the wall of the tank and opening via a Venturi tube to the suction duct of the immersed oil pump.

Abstract: An apparatus for recovering liquids from a wellbore includes a primary pump for pumping a primary fluid through a primary fluid conduit positioned in the wellbore, and a secondary, displacement-type pump. The displacement pump includes a recovery section and a drive section, the volume of the recovery section being adapted to vary in inverse proportion with the volume of the drive section. The secondary or displacement pump also includes an inlet arrangement with a suitable one-way valve for allowing wellbore liquid to flow into the recovery section, and an outlet arrangement adapted to carry liquid expelled from the recovery section to the surface. A venturi body is connected in the primary fluid conduit and is adapted to produce a reduced pressure at a venturi outlet as the primary pump pumps the primary fluid through the conduit and venturi body at a first flow rate and with a first pressure differential across the venturi body.

Abstract: This invention relates to a check valve having a first port connected to a chamber, a second port connected to a source of vacuum having a first fluid pressure and a third port connected to a second fluid pressure. A wall which separates the second port from the third has a plurality of openings therein which allows communication from the first port to the second port. A poppet moves away from the plurality of openings to allow air to flow from the first port to the second port in response to the first fluid pressure. When the fluid pressure in the chamber substantially equals the first fluid pressure, a pressure differential between the first and second pressures moves the poppet toward the plurality of openings to allow the second fluid pressure to further evacuate air from the chamber.

Abstract: An air volume booster for sprayers which have a turbine, which when connected to a compressed air source, provide a high volume, low pressure output to a spray gun connected to the sprayer. The booster comprises a supercharger having a shallow cylindrical chamber mounted to the sprayer below the turbine chamber at the intake side thereof, and two inlet ports, one of which is connected to a compressor which provides a source of pressurized air, the other opening to the ambient air. The first inlet port has a venturi incorporated therein and connected to the pressurized air source, which increases the volume of air fed into the supercharger chamber and in turn into the turbine through its intake side for delivery of a substantially increased volume of air at low pressure from the output side of the turbine directed to the spray gun connected thereto.

Abstract: A fuel injection pump for internal combustion engines that has a pump interior and a final control element chamber, separated from it, the latter having an electric final control element for actuating a quantity adjusting device that determines a fuel injection quantity, parts of the final control element from which a control variable for the injection quantity is derived and which thereby serves as a material measure, are to be protected from the influence of fuel. By means of a jet pump through which a permanent propulsive flow flows and which is part of a flow conduit, the static pressure at the intake bore of the jet pump that communicates with the final control element chamber is lowered, and this negative pressure is utilized for evacuating the fuel entering the final control element chamber in the form of a leakage flow along the bearing of a control shaft.

Abstract: An air pump for inflating an inflatable article includes a multi-stage centrifugal compressing section for inhaling and compressing primary air and a secondary air inhaling mechanism provided downstream of the multi-stage centrifugal compressing section. At the beginning of the inflation operation, extra secondary air can be rapidly inhaled into the air pump and delivered into the inflatable article mainly by means of the secondary air inhaling mechanism and thereafter, when the inner pressure of the inflatable article gradually increases to exceed the predetermined level, the secondary air inhaling mechanism may be closed so that only the multi-stage centrifugal compressing section for primary air functions to continue the subsequent inflation operation in a higher pressure range. Thus, an ideal and speedy inflation operation may be achieved without reducing the inflation pressure.

Abstract: The invention relates to a mechanical vacuum pump having a displacement member (2) and a casing (1) which is provided with an inlet channel (3) on the suction side and an outlet channel (4) on the discharge side. A spring-loaded non-return flap valve (5) is incorporated into the outlet channel (4). Upstream of this flap (5), a gas jet pump (7, 8) is installed in the outlet channel (4), the jet direction being parallel to the sealing surface of the non-return flap valve (5).This gas jet pump allows to significantly increase the final vacuum of the mechanical vacuum pump and to improve the cooling of the pump.

Abstract: A fuel delivery system for automotive engine and like applications which comprises a canister for positioning within a fuel tank having a lower end with a fuel opening and an internal wall spaced from such lower end dividing the canister into upper and lower fuel chambers. An electric-motor fuel pump is positioned within the upper chamber, has a fuel inlet coupled to the lower chamber through the canister wall and a primary outlet for feeding fuel under pressure to an engine. A fluid conduit separate from the pump inlet extends through the upper and lower chamber-separating wall, with an inlet end being positioned within the lower chamber and an outlet end being positioned within the upper chamber. A secondary outlet from the pump supplies fuel under pressure through a nozzle to the fluid conduit for aspirating vapor and fuel through the fluid conduit into the upper chamber. Any vapors entrained in the fuel fed to the upper canister chamber are thus permitted to vent through the canister top.

Abstract: A rotary pump system for pumping a liquid which is delivered under pressure from a backing pump 8, in which a rotary pump 1 has a pump body which is required to be drained of liquid at times when the pump 1 is inoperative, wherein the backing pump 8 has a by-pass circuit between its inlet and outlet ports, the by-pass circuit comprisng a multiphase pump 13 which has a suction inlet 14 connected to a drain point 16 on the pump 1 body and a vortex chamber 17 through which liquid passes from the pump 13 outlet to the backing pump 8 inlet, a central outlet 18 of said vortex chamber being connected to an inlet port 6 of said pump 1. This allows automatic draining of the pump 1 body when use of this pump is not required.

Abstract: Fluid flow control valves are provided having a jet pump or aspirator connected to a plurality of fluid passageways. Fluid flow from one of the passageways through the jet pump creates a partial vacuum enabling fluid flow to be drawn through the other of the fluid passageways connected to the jet pump. Such valves enable hydraulic fluids of a single-acting piston-cylinder unit or the like to be readily exhausted.

Abstract: A skimmer for skimming water from a swimming pool or spa is provided with entraining means for entraining additional water from the pool or spa to thereby increase the flow of water into and out of the skimmer. The entraining means includes two nozzle members which cooperate with each other to jet an entraining stream of water through the skimmer. The skimmer is also provided with isolating means for isolating the entraining stream of water from the rest of the water flowing through the skimmer. The isolating means includes actuating means for selectively actuating and deactuating the isolating means such that the skimmer can be operated at a normal flow rate when the isolating means is actuated and at an increased flow rate when the isolating means is deactuated.

Abstract: A device for creating a pressure difference in the flow of a fluid which may be a liquid or a gas and a number of technical applications. The fluid medium is fed along the longitudinal axis of a double cone, consisting of two coaxial hollow cones linked by their smallest faces. At the narrowest point of the double cone a depression occurs in the fluid flow which is made accessible to the outside by means of a lateral connection piece. Compared with a conventional venturi the present double cone offers increased efficiency owing to its special shape, which is defined by geometric parameters. The high efficiency of the double cone, which can be further improved by a special embodiment, makes the device suitable for a number of technical applications.

Abstract: In a jet pump, the suction pressure (Po) generated may be kept constant within predetermined limits and times by varying the pressure ratio f(p) providing a prescribed value for the pressure ratio f(p) is determined by computer-aided iterative changing of an existing value of the pressure ratio f(p) using an algorithm and a measured value for the pressure (Pe) of the delivery fluid.

Abstract: The apparatus relates to a jet pump or apparatus which displaces a main fluid by a pressurized driving liquid. The apparatus has a duct to receive the main fluid, and a driving liquid manifold cooperating with the duct to receive the pressurized driving liquid. First and second sets of inwardly facing jet nozzles are disposed adjacent a transverse plane of the duct and penetrate the duct side walll to pass the driving liquid into the duct at a mixing portion of the duct having a constant cross-sectional area. The first and second sets of jet nozzles are inclined at angles to the duct axis so that the first nozzles are inclined at a greater angle than the second nozzles. Efficiency of the pump is improved by admitting pressurized gas into the duct and providing the pump with a diverging outlet portion to act as diffuser.

Abstract: The invention does away with the necessity of moving parts such as a check valve in a nuclear reactor cooling system. Instead, a jet pump, in combination with a TEMP, is employed to assure safe cooling of a nuclear reactor after shutdown. A main flow exists for a reactor coolant. A point of withdrawal is provided for a secondary flow. A TEMP, responsive to the heat from said coolant in the secondary flow path, automatically pumps said withdrawn coolant to a higher pressure and thus higher velocity compared to the main flow. The high velocity coolant is applied as a driver flow for the jet pump which has a main flow chamber located in the main flow circulation pump. Upon nuclear shutdown and loss of power for the main reactor pumping system, the TEMP/jet pump combination continues to boost the coolant flow in the direction it is already circulating.

Abstract: A device for elevating liquids in which liquid is raised in a pipe under the action of a pressure difference which is smaller than a pressure difference of a solid liquid column having a height equal to a height of elevation.

Abstract: An evacuation system for removing corrosive gas from a process tube during processing of semiconductor wafers. An aspirator is used for an initial pump down of the process tube to approximately 200 TORR. The aspirator has no moving parts and does not react to the corrosive gas. The aspirator is controlled by a control circuit which utilizes a series of relays to open a ball valve and start the aspirator. After 200 TORR is reached, the aspirator is shut off, the ball valve is closed and a high vacuum pump is utilized to complete the evacuation. Because the vacuum pump is exposed to a reduced volume of corrosive gas, its lifetime is correspondingly increased.

Abstract: A well deodorizing apparatus includes a checkvalve which provides unidirectional flow in a pump discharge pipe and a tap upstream from the checkvalve to divert a fraction of the pump discharge and direct it through a venturi orifice. The venturi effect atomizes the diverted water resulting in a pressure decrease in a mixing chamber. Ambient air is drawn into the mixing chamber and intermixed with the atomized water. The resultant mixture of air and water is directed back into the ground water reservoir thereby oxygenating the ground water and deodorizing the well.

Abstract: A wind pump has a liquid supply pipe connected with a convex pipe through a Venturi pipe open to wind, and a delivery pipe connected with the convex pipe and provided with a pumping-out element for elevating a liquid portion drawn into the convex pipe, and the pump is provided with a liquid supply delaying element for delaying the liquid supply from the inlet pipe into the convex pipe and subsequent completing the liquid portion in the latter during periods of weak wind. The delivery pipe is composed of a plurality of vertical pipe portions interconnected by intermediate accummulating container elements.

Abstract: A fluidic pumping system comprises a reverse flow diverter positioned below the level of a liquid to be pumped and inserted between a charge vessel and a delivery pipe. A control system including pressure-responsive devices effects alternate pressurizing and venting of the charge vessel for pumping the liquid. Passage of liquid from the charge vessel into pipes leading to a compressed air supply and the reverse flow diverter generates pressure changes which are detected and the electric output signals are used to operate the control means.

Abstract: An article transfer pumping system combining the effects of a jet pump and an air lift pump to minimize article damage while increasing lift capability and overall system efficiency. Air lift pump placement adjacent the pump inlet aerates the rising column of water with articles such as fish, even large salmon, being raised by the jet pump, whereas jet pump placement adjacent the discharge end of the conduit increases pump efficiency.

Abstract: A horizontal type rotary compressor includes a lubricant distribution system which does not require a check valve for preventing the return of lubricant from the frictional bearing surfaces to the blade chamber. An eccentric blade within a blade chamber pumps lubricant out of the blade chamber through an aperture in one wall thereof. A dispensing pipe communicates the aperture of the blade chamber with the frictional bearing surfaces and includes an opening in the pipe adjacent the blade chamber. Reciprocal movement of the blade causes lubricant to be sucked through the aperture of the blade chamber and discharged from the blade chamber into the dispensing pipe. The opening in the pipe permits a larger amount of lubricant to pass into the pipe than out of the pipe, thereby effectively acting as a check valve and negating the need for a separate check valve in the lubricant distribution system.

Abstract: A horizontal type rotary compressor includes a lubricant distribution system which does not require a check valve for preventing the return of lubricant from the frictional bearing surfaces to the blade chamber. An eccentric blade within a blade chamber pumps lubricant out of the blade chamber through an aperture in one wall thereof. A dispensing pipe communicates the aperture of the blade chamber with the frictional bearing surfaces and includes an opening in the pipe adjacent the blade chamber. Reciprocal movement of the blade causes lubricant to be sucked through the aperture of the blade chamber and discharged from the blade chamber into the dispensing pipe. The opening in the pipe permits a larger amount of lubricant to pass into the pipe than out of the pipe, thereby effectively acting as a check valve and negating the need for a separate check valve in the lubricant distribution system.

Abstract: A fluidic pumping system comprises a reverse flow diverter positioned below the level of a liquid to be pumped and inserted between a charge vessel and a delivery pipe. Control means including signal generating means, conveniently an ultrasonic transducer, effect alternate pressurizing and venting of the charge vessel for pumping the liquid. A pipe for the supply of compressed air to the charge vessel serves as a waveguide for the signals from the signal generating means.

Abstract: Skimmer apparatus for swimming pools and the like having a receptacle in which a skimmer basket is fitted. The receptacle provides a chamber into which pool water flows through the skimmer. Water is caused to flow into and through the receptacle by a connection within the receptacle to the makup water inlet of the pool. The inlet water discharging into the pool through the chamber of the receptacle and the flow of the water by an ejector effect causing flow through the receptacle thereby causing a substantial amount of the pool water to be recirculated through the receptacle although it is not recirculated through the conventional pool suction pump and inlet which operates to supply the inlet water pressure for activating the skimmer apparatus.

Abstract: A water powered sump pump having an ejector with an inlet end and a discharge end and enclosed within a housing providing support for the ejector. A control chamber about the inlet end of the ejector has a diaphragm valve which operates to control communication with a water pressure source responsive to operation of a float controlled pilot valve. Multi-stage turbulence and progressively increasing energy and velocity is effected in sump water directed to a propulsion zone defined about the ejector nozzle and communicating with the mouth end of a venturi leading to a discharge outlet from the ejector.

Abstract: The suction side performance of an injection pump for pumping a viscous chemical liquid or semi-liquid additive into a liquid flowing in a pipeline is improved by simultaneously pumping a compatible low viscosity liquid into the line leading to the suction side of the injection pump. The low viscosity liquid acts as a lubricating fluid for the viscous additive and assists movement of the viscous additive to and through the injection pump. The combined action of the low viscosity liquid and injection pump may also assist solution or dispersion of the additive in the liquid flowing in the pipeline.

Abstract: A combined pressure regulator and jet pump includes a valve member and cooperating nozzle defining member which are coaxial and independently movable. Both members are responsive to the difference in upstream and downstream pressures and each member will move relative to the other in response to a predetermined pressure difference. The relative movement between the nozzle defining and valve members will not interrupt the pumping action resulting from fluid flow through the variable area nozzle formed by these members.

Abstract: Systems for evacuating process fluids having condensable and incondensable components, especially those including corrosive constituents, include a condenser for condensing at least part of the condensable component and discharging the condensate from the system, a jet diffuser supplied with atmospheric air as a motivating fluid for diluting and increasing the pressure of the uncondensed portion of the process fluid, and a liquid ring suction pump for further increasing the pressure of the diluted uncondensed process fluid and discharging it from the system.

Abstract: An aspirator using positive pressure from a suitable source generates a vacuum pressure when the primary source of vacuum pressure, typically the engine intake manifold, prodcuces insufficient vacuum pressure to operate a device such as a road speed control servomotor. The aspirator assembly is connected to the source of positive pressure and the engine intake manifold as well as to atmosphere and to the device to be operated by vacuum power. When there is sufficient intake manifold vacuum pressure for the desired purpose, there is no flow through the aspirator and the engine intake manifold supplies all of the vacuum needs of the servomotor. When aspirator vacuum pressure is required due to insufficient manifold vacuum pressure, the aspirator is opened to generate aspirated vacuum pressure and the connection between the servomotor and manifold vacuum is closed. The aspirated air is delivered to the engine intake manifold.

Abstract: A main pump has a jet pump powered by the main pump output for forcing a portion of the cooler inlet fluid into the casing chamber of the main pump in order to cool the main pump during periods of low flow.

Abstract: A variable speed centrifugal pump for aircraft fuel systems and the like having the capability of matching fuel flow and pressure to engine requirements throughout a variable flight profile without in-line flow controls and metering devices comprising a unique combination of centrifugal impeller stage and positive displacement pump device which controllingly, drivingly, fluidly couples the impeller to the aircraft engine drive. The positive displacement pump device includes rotating hydraulic displacing input and output members, the latter being driven by the former at a relative speed normally responsive to discharge flow rate of the positive displacement pump device which is controlled to regulate impeller speed for matching pump flow and pressure to engine requirements.

Abstract: A high capacity evacuation system employing a precondenser receiving process fluids having liquid and gaseous phases, a first stage jet diffuser and a second stage liquid ring pump for handling the process fluids and in which system the motivating fluid for the jet diffuser is air; seal liquid is continuously fed from a seal liquid source outside the system; and the piping between the components of the system is unobstructed.

Abstract: A method for operating a water-jet pump, in which the water needed for operation of the pump is recirculated in a cycle. The water is pressurized by means of compressed air at a substantially constant air pressure and the compressed air is used to drive out the water through the water-jet pump. Expanding the compressed air in a defined expansion space withdraws heat from the water by absorbing such heat in the air during and after its expansion. Apparatus for operating a water-jet pump includes a pair of ejecting receptacles and a first water valve for alternate connection of the ejecting receptacles to the pressure side of the water-jet pump. Second water valves return to the ejecting receptacles water which has been discharged from the water-jet pump.

Abstract: The output pressure of a piston pump is limited by opening of a pressure responsive limiting valve discharging pump fluid in jet form through an injector into the inflow stream in the suction intake conduit to the pump. The jet is discharged in a direction opposite to the inflow stream to reduce inflow pressure for pump pressure control purposes.

Abstract: An oil pump is disclosed having a pressure pipe which is coaxially disposed within a suction pipe to provide a shielding of the pressure pipe. Both the suction pipe and the pressure pipe are arranged parallel to a vertical axis of a housing of the pump. An oil-jet ejector is connected to the interior of the pump housing through openings which provide a continuous venting of the oil flow within the pump. The venting is provided on both the intake and discharge ends of the pump.

Abstract: A variable flow ejector for use in controlling the amount of bypass flow in a fluid delivery system which includes a pump, a metering orifice and a bypass line for circulating a variable amount of flow from the pump outlet to the pump inlet to control the pressure drop across the orifice. The bypass flow enters the ejector through a variable area nozzle coaxially disposed with respect to a stream from a source of fluid whereby the velocity head of the bypass flow is recovered as pressure head at the pump inlet for increased efficiency. The bypass flow is controlled by varying the area of the ejector nozzle as a combined function proportional to the pressure drop across the orifice plus the time integral of the error in the pressure drop across the orifice.

Abstract: A dual speed mechanical rotary vacuum pump wherein a mechanical rotary vacuum pump is directly connected to a two speed electrical motor which drives the pump and the speed of the motor is controlled by an electrical control circuit which selectively causes the motor to rotate at either a first speed for a predetermined period of time or at a second slower speed. The speed of the motor is automatically switched to the slower speed after the predetermined period of time.

Abstract: Apparatus for adding emulsifier to a fluid comprising a conduit for flow of fluid, having a nozzle portion or restriction in the conduit, and a tube extending into the region of the restriction, to supply emulsifier into the restriction region. A valve is disposed in the conduit so as to be responsive to the flow of fluid, displacement of the valve member resulting in displacing the tube thereby to render the displacement of the tube dependent on the flow rate of the fluid through the conduit. The conicity and diameter of the nozzle are adapted to the flow rate of the fluid in the conduit.

Abstract: A short, wide angle diffuser having means for preventing boundary layer separation is disclosed. The means includes means for injecting a fluid stream into the diffuser at preselected locations for mixing with the boundary layer fluid. The injected fluid may be derived from the fluid exiting from the diffuser and fed back into the diffuser.

Abstract: A charge pump augmenting device includes a jet pump, powered by fluid flow from a main pump, to draw fluid through a check valve from a reservoir to supply additional fluid to the main pump when the charge pump supplying the main pump is inadequate to meet the demands of the main pump.

Abstract: In a liquid ring compressor with a liquid separator which has a liquid take-off point in its housing which is fed by the liquid ring co-rotating with the impeller and connected through connecting lines outside the housing to internal auxiliary liquid circuits, a liquid jet pump is installed in the connecting line and supplied with operating fluid from the liquid take-off point and is used to return liquid which is separated from the compressed gas at least during the start up of the compressor.

Abstract: The pressure acting on a pressure loaded cheek plate in a pump is selectively vented by a servo valve actuated by the buildup of pressure in the pump outlet caused by normal parasitic losses in a downstream hydraulic flow circuit. Since it may be desirable to actuate the servo valve by the pressure drop across an orifice in the outlet line or by a suitable orifice in the pump return to pump, both embodiments are disclosed as exemplary means for achieving the premises of this design.

Abstract: A method for operating a water-jet pump, in which the water needed for operation of the pump is recirculated in a cycle. The water is pressurized by means of compressed air at a substantially constant air pressure and the compressed air is used to drive out the water through the water-jet pump. Expanding the compressed air in a defined expansion space withdraws heat from the water by absorbing such heat in the air during and after its expansion. Apparatus for operating a water-jet pump includes a pair of ejecting receptacles and a first water valve for alternate connection of the ejecting receptacles to the pressure side of the water-jet pump. Second water valves return to the ejecting receptacles water which has been discharged from the water-jet pump.