Abstract: A pump assembly for concrete comprises a hopper adapted to hold the mass and having a front wall formed with a front port centered on a front axis perpendicular to the front wall at the front port and a rear wall formed with two rear ports centered on respective rear axes perpendicular to the rear wall at the rear ports and generally parallel to the front axis. Respective piston pumps secured to the rear wall outside the hopper over the rear ports can draw portions of the mass out of the hopper and expel the drawn-out portions back into the hopper through the respective rear ports. An outlet conduit is connected to the front wall outside the hopper over the front port. A generally curved or nonstraight distributor pipe in the hopper has a front end engaged over and aligned with the front port, a rear end engageable over and alignable with either of the rear ports, and a generally arcuate centerline crossing the front axis at the front port and extending parallel to the rear axes at the rear wall.

Abstract: Apparatus for pumping a powdery or granular material has a first cylinder and a second cylinder parallel to each other and each having a front end and a rear end, a connector box connecting the respective rear ends of the cylinders for placing them in communication, a material inlet at the front end of the first cylinder, a material outlet at the front end of the second cylinder, a first piston in the first cylinder and a first piston rod connected thereto and extending out of the first cylinder, a second piston in the second cylinder and a second piston rod connected thereto and extending out of the cylinder, and a reciprocating drive connected to the piston rods for reciprocating the pistons simultaneously in the same directions within the respective cylinders, the pistons each having openings therethrough and a first one-way valve on the first piston normally closing the opening therein and opening when the first piston is moving in the forward direction and a second one-way valve on the second piston norm

Abstract: An ejector 110 having an additional nozzle 173 for issuing a fluid at a relatively high pressure through a throat 113 of the ejector 110 into an outlet 114 from the throat 113, so as to clear any material lodging in the outlet 114 and/or the throat 113. The additional nozzle 113 may be co-axial with the main nozzle 140 of the ejector 110, or angularly disposed from it.

Abstract: An apparatus for and method of pumping hot, erosive slurry of coal solids in a coal derived, water immiscible liquid to higher pressure involves the use of a motive fluid which is miscible with the liquid of the slurry. The apparatus includes a pump 12, a remote check valve 14 and a chamber 16 between and in fluid communication with the pump 12 and check valve 14 through conduits 18,20. Pump 12 exerts pressure on the motive fluid and thereby on the slurry through a concentration gradient of coal solids within chamber 16 to alternately discharge slurry under pressure from the outlet port of check valve 14 and draw slurry in through the inlet port of check valve 14.

Abstract: A viscous material pump, in particular for the conveyance of concrete through a housing (3) of a switch tube (2) has a swivel body (26) fastened on an axially supported pivot shaft (44). The swivel body alternately connects a discharge opening (25) mounted in a housing wall with two inlet openings (6, 7) arranged in another housing wall. The centers of the inlet and outlet openings, respectively, are arranged in radial displacement from the shaft axis (35). The displacement of the inlet openings (6, 7) and the discharge opening (25) from the shaft axis (35) differs and is so selected that the displacement (R.sub.1) of the inlet openings (6, 7) is larger than the displacement (R.sub.2) of the discharge opening (25).

Abstract: A diaphragm pump is disclosed of a configuration particularly adapted to pumping of liquids containing a high percentage of solids without clogging of the valving and/or pumping chamber. A flexible diaphragm overlies an opening in the pump housing which defines a pumping chamber below the diaphragm which is in communication with inlet and outlet valving chambers, in each of which is disposed respective gravity biased closed inlet and outlet valve overlying valving ports. The valves are guided by valve stems loosely fit into guide tubes extending above each of the valves. Both inlet and outlet flow is directed upwardly through the valve ports in order to insure a cleaning action to avoid clogging of the valves. The inlet flow is directed tangentially into the pumping chamber to create a scouring or turbulent flow action to minimize the tendency for sedimentation and consequent clogging of the pumping chamber.

Abstract: A piston pump installation, and method of operation the same, for conveying sludge-type materials and granulated and solid materials with added fluid, comprising one or more, preferably two, cylinders arranged adjacent and parallel to one another with axially reciprocating pistons therein. Each cylinder having a valve provided at its front end, and a drive and control device located at the rear, opposite end. The valve located at the front of each cylinder is structured as a slide valve or so that it can turn and is connected to a suction main on one side and to a delivery pipe on the other side, the suction main and the delivery pipe preferably being perpendicular to the longitudinal axis of the cylinder. Each valve having a valve body with an inlet orifice and a cutting edge as well as an overlapping surface. The inlet orifice in the valve body being designed as a flow connection between the suction main and the cylinder as well as between the cylinder and the delivery pipe.

Abstract: In the method of the present invention, the slurry as it flows from a source thereof is pre-rotated prior to entering a circular vertical confined space that has a cut water discharge in the upper portion thereof. The pre-rotating slurry upon entering the confined space is subjected to the rotary action of first and second laterally spaced circular surfaces that have a number of laterally spaced ring-shaped surfaces situated therebetween. The circular surfaces and ring-shaped surfaces are power driven and rotate concurrently as a unit. As such rotation takes place, the boundary layers of slurry that adhere to the circular surfaces and ring-shaped surfaces are sheared from the balance of the slurry, and the slurry in the confined space rotating as a result thereof. As a result of this rotation, the slurry in the confined space sequentially discharges through the cut water to be replaced by pre-rotating slurry that enters the confined space.

Abstract: A method of transferring flowable concrete containing aggregate to a desired location at substantially constant rate without sharp variations in pressure and a power driven pump that may be used to carry out the method. The pump requires no valves, is highly abrasive resistant, has a high constant flow rate discharge due to not operating intermittently, and subjects the conduit or hose through which the concrete discharges to a minimum of strain as the concrete flows at a substantially constant rate therethrough with no sharp variations in pressure, and with minimum frictional resistance.

Abstract: A valve structure for a viscous material pump having a material reservoir, a pair of alternately operable material conveying cylinders, discharge conduit means, and a valve control means coupled to the valve structure and to the material conveying cylinders. The valve structure has a pair of movable swivel pipes extending between the conveying cylinders and the discharge conduit means. Each of the swivel pipes has an opening movable over one of the conveying cylinders to receive the contents discharged therefrom and a plate movable over said one conveying cylinder to block same.

Abstract: A power-assisted valve is provided which is particularly effective for systems handling viscous materials, such as certain metering systems. The check valve operates effectively even with highly-filled viscous resins used in such systems. The valve includes a valve seat and a valve ball which can be urged toward the valve seat to a closed position by a fluid-powered cylinder and piston. The piston rod is separate from the valve ball so that the ball can rotate relative to the valve seat.

Abstract: To prevent leakage of wet concrete passing from a reciprocating pump to a delivery conduit and to prevent clogging of the seal and valve means interposed between the pump outlets and the mouth of the delivery conduit, a floating sleeve is biased by pump system hydraulic pressure into solid engagement with the wear ring which in turn is held in firm sliding contact and sealed engagement with an opposing wear plate at the outlets of the pump structure. The floating sleeve is pressure sealed on opposite sides of a delivery port for pressurized hydraulic fluid to positively exclude concrete from fouling the operation of the sleeve. Concrete grout under pressure entering a void behind the sleeve applies additional pressure to the sleeve to bias the wear ring even in the event of hydraulic pressure loss. The grout within the void prevents the sleeve from ever backing away from the wear ring.

Abstract: A wear-resistant and chemically-inert article made from a sintered mixture of polytetrafluoroethylene, graphite fibers, and fluorinated graphite.

Abstract: Slurry consisting of water and solid matters are charged into a plurality of vessels by means of a low-pressure slurry pump, and is discharged into a transfer pipe by fluid pressure generated by a high-pressure driving liquid pump. A float member is positioned at the border of the slurry and the driving liquid in each vessel. Any failure taking place in the apparatus is displaced or informed on the basis of the period of time taken by each float member moving between the upper and lower limit positions or the number of movements.

Abstract: A system for pumping an abrasive or corrosive fluid at high pressure and with a variable delivery rate. The system comprises raising the pressure in a non-corrosive and non-abrasive liquid in a pressure raising means comprising pump means and at least two intermediate cylinders containing floating pistons. The pressure is transferred to the abrasive or corrosive fluid in pressure transfer vessels. A valve arrangement controls the flow of non-abrasive and non-corrosive liquid to the intermediate cylinders and return means are provided for returning the floating pistons after each stroke. The valve arrangement is controlled in dependence on the positions of the floating pistons in their intermediate cylinders.The system is particularly useful for supplying clay slurry to a high pressure plate filter press.

Abstract: A ram type pump is disclosed for pumping manure from a collection area to a storage area. The pump has a hollow cylindrical housing having a transfer portion and an actuator portion. Manure is pushed through the transfer portion by a reciprocating cylindrical ram slidably located in the housing. The ram is operated by a hydraulic actuator located in the housing actuator portion. The housing actuator portion is releasably coupled to the transfer portion. This releasable coupling retains a removable bearing and seal assembly concentrically located for sliding, sealing engagement of the ram. The housing transfer portion includes a guide bearing assembly for concentric sliding engagement of the ram during reciprocating movement of the ram. Also, the housing actuator portion includes radially disposed guide means for quick axial alignment of the ram in the housing.

Abstract: A reactor system for continuously effecting the hydrolysis of cellulosic materials, as relatively concentrated aqueous mixtures, comprises a tubular reactor, a high solids pump, steam injecting means, a discharge valve controlled by pressure-responsive means, and means for collecting and recovering the reaction products from the hydrolyzate. The high-solids pump apparatus utilizes a valve having a flow distributing passageway of arcuate, uniform circular cross-section. The various portions of the apparatus are constructed with uniform internal dimensions and configurations, so as to avoid any constriction to flow of the material therethrough, thus minimizing the tendency for blockages to occur therewithin. The loading mechanisms are unloaded alternatingly by a reciprocating ram, so as to substantially continuously feed material through the associated valve.

Abstract: A manure transfer pump with a cylinder, a piston reciprocable in the cylinder, a connecting rod connected to a mid section of the piston and a gate assembly pivotally mounted inside the piston between the axis of the connecting rod connection and the rod end of the piston. In operation, the gate assembly swings open during a return stroke and allows manure to pass through the piston. On a pumping stroke, the gate assembly closes and manure is forced out the discharge end of the cylinder and sucked in the inlet end at the same time.

Abstract: A pump for pumping viscous mixtures is disclosed. The pump comprises a cylindrical casing having a discharge outlet and a feeding opening at its top and side, for a hopper into which is charged viscous mixtures, a cylindrical tube slidably mounted in the casing for movement toward the discharge outlet for trapping a certain quantity of viscous mixture, and a piston slidably mounted in the tube for discharging such quantity of viscous mixture through the discharge outlet of the casing. The hopper is wider than the casing and tube for ease of filling the tube. The tube is advanced across the feeding opening by an advancing force which is exerted on the tube at a point above its longitudinal axis.

Abstract: The present piston pump conveys concrete mixes through, for example, two pump cylinders located in a frame structure so that the cylinder axes extend substantially in parallel to each other. The pump cylinders cooperate with scavenging chambers also installed in said frame structure. To facilitate the assembly and disassembly of said pump cylinders in said frame structure without disassembling the entire frame structure, releasable, form locking connecting elements are operatively arranged between the frame structure and the scavenging chambers whereby the latter may be axially shifted in the frame structure for removing the pump cylinders from their sockets in the frame structure, for example, for maintenance work. Upon insertion of the cylinders into the frame structure, the connecting elements are tightened whereby the pump cylinders are held in position in the frame structure by the connecting means through said scavenging chambers.

Abstract: A dressing and food dispenser which is adjustable for quantity of portion dispensed, useable with hot or cold thermos dressing and food containers which may be equipped with agitators; utilizing dual rack gears to first apportion then dispense.

Abstract: The present control valve is intended to handle highly viscous material such as concrete mixes. For this purpose two valve plates are arranged in a valve housing in such a manner that in one position of the two valve plates relative to each other, one valve plate closes a suction inlet port and opens a pressure outlet port while the other valve plate opens a suction inlet port and closes a pressure outlet port. When the positions of the valve plates change, their respective operation is reversed. The valve plates are supported by drive rods which in turn are supported at both ends of the valve housing in respective slide bearings. One end of each drive rod is operatively connected to a hydraulic drive. The opposite end of each drive rod carries a piston movable in a cylinder, the far end of which is operatively connected to a rinsing liquid container. The rinsing liquid conduits extend through grooves in the slide bearings of each drive rod, whereby these rods are cleaned to protect the rod bearings.

Abstract: A self-reversing hydraulic control system for use with a device to be driven in opposite directional modes, especially a self-reversing pump driven by such a device. The system depends upon a flow sensing element disposed to sense flow associated with movement of the driven device and adapted to generate a stop signal responsive to the termination of such flow. A means responsive to the stop signal is then effective to shift the system from one directional mode to the other. Also featured is a sensor disposed to receive and transmit hydraulic fluid under pressure to drive the device, stoppage of the flow adapted to cause the sensor to shift position and to transmit pressurized hydraulic fluid pressure, as the stop signal via a hydraulic line. In preferred embodiments the self-reversing hydraulic control system has a two-position 4-way valve which is shifted in position by the hydraulic stop signal.

Abstract: An arrangement for hydraulically conveying solids of different specific weights in form of slurries has at least two elongated chambers the effective length of each of which may be varied in dependence on the specific weight of the solid component of the slurry supplied to the respective chambers. The slurry is cyclically fed into the chambers at substantially atmospheric pressure, and when the respective chamber is full pressurized hydraulic fluid, such as water, is utilized for discharging the slurry from the full chamber into a discharge conduit. The arrangement includes a device which measures the specific weight of the solid component and varies the length of the respective chamber in dependence on the measured specific weight. A plurality of valves controls the admission of the slurry and of the pressurized hydraulic fluid into the respective chambers so that, when one of the chambers is being filled with slurry, another chamber is discharged into the discharge conduit.

Abstract: A pivotal pipe valve unit for concrete supply hoppers having a pair of concrete pumps of the piston-cylinder type which includes a shuttle valve pipe mounted within the hopper for pivoting about a discharge line. The inlet end is spaced slightly from a wear plate which encompasses the cylinder openings to the hopper and is pivoted for alternate alignment with the discharge opening from the pump cylinders. An outer base member is secured to the inlet end and has an annular recess receiving a wear ring. A hydraulic source is coupled to the chamber and creates a pressurized liquid backing of the ring. An annular seal with a metal backing is located to the backside of the ring. An accumulator tank is connected to the hydraulic supply system to firmly hold the ring in sliding sealing engagement with the wear plate with a cushioned type support. The wear ring is slightly thinner than the annular recess and may tilt such that the ring and wear plate sealing surfaces remain parallel.

Abstract: A piston pump for the transport of viscous materials and, in particular, concrete, includes a housing having defined therein an annular-shaped working space, a piston slidably mounted within the annular-shaped working space for oscillatory movement, and a pressure conduit and a suction conduit, each of which is communicative with the working space. The pump also includes control means having a member which is disposed in the annular-shaped working space for connecting the portion of the working space, which lies in front of the moving piston, to the pressure conduit and for simultaneously connecting the portion of the working space which lies back of the moving piston, to the suction conduit. In addition, the pump includes means for reversibly driving the piston so that it moves in an oscillatory manner in the annular working space, reversing its direction when it nears the member of the control means.

Abstract: A pump for conveying cement comprises two pump cylinders and reciprocating pistons, an input container, a multi-limb oscillating shutter valve arranged in front of the pump cylinders and below the input container, the housing of the valve including a suction connection leading from the input container, two ports connected to the pump cylinders respectively, and an outlet located in the end wall of the housing. Two inlet ports are provided in the housing for placing the suction connection in communication with the ports connected to the pump cylinders respectively. The oscillating shutter is mounted on a horizontal shaft to be movable between two positions, and includes two control limbs, each controlling a different one of said inlet ports, and an outlet control limb the forward edge of which passes over and controls said outlet.

Abstract: A pumping system for pumping liquid clay or slip into a filter press comprises a hydraulically-powered double-acting ram for pumping the slip and a hydraulic control circuit for the ram. The control circuit includes a pair of hydraulic pumps one of which provides a high pressure, low volume delivery and the other of which provides a low pressure high volume delivery, and valves controlling the supply of oil from these pumps to the ram according to the resistance encountered by the ram.

Abstract: An improved manure handling apparatus of the flow-through piston or plunger type. The apparatus has a passageway, vertically mounted in the floor of a barn with a plunger slidably mounted within the passageway. The plunger has a pair of swinging doors for opening or closing the passageway. First means move the plunger up and down within the passageway to push manure therethrough. Second means move the doors open or closed depending on the direction the plunger is moved.

Abstract: In a double-cylinder pump for conveying cement, a distribution pipe is pivotally driven into alignment with each of the cylinders in turn. A wearing ring, which provides a seal between the end of the pipe and the cylinders, is mounted so as to be movable with respect to the end of the pipe so as to be able to assimilate wear.

Abstract: A double acting concrete pump having a pair of interconnected mud pistons driven by a reversing hydraulic actuator, which is reversed by the piston motion at the end of each stroke, and has a pressure relief to avoid bottoming at the end of a stroke. The mud pistons slide in cylinders which are lubricated and cleaned by a supply of lubricant circulated between the cylinders by the piston action. Concrete or similar mud-like material is drawn from a hopper and pumped out through a common outlet.

Abstract: A batching pump for lime concrete comprising a base, a longitudinal displacement feeder attached to said base, at least one evacuator conduit attached to said base, at least one cylinder for receiving at one end thereof lime concrete and pumping lime concrete from said cylinder from said same end to said conduit, pivotal structure to pivotally move said cylinder between said feeder and said conduit, and conduits to feed pressurized gaseous fluid to said cylinder.

Abstract: There is disclosed herein a suspension system including a shipping stop arrangement for resiliently mounting a refrigeration motor-compressor unit within a hermetically sealed shell. The suspension system comprises a three point supporting arrangement employing a pair of laterally disposed springs, each having a single tapered portion, for providing vertical support to the motor-compressor, in combination with a single top spring for providing lateral stability. Lateral and vertical motion limiting shipping stops are also provided to prevent excessive movement of the motor-compressor, such as may occur during shipment thereof, from damaging the suspension system members. In addition, the system is capable of accommodating different size motor-compressor units in a standardized hermetic shell size by using simple spacers of different sizes.

Abstract: A pivotable pipe slide for use in a two cylinder concrete pump includes a swing pipe which is pivotably moved in a reciprocal fashion between the two discharge openings of the pump cylinders in such a manner that it is pressed against the discharge openings in its end positions, while it is moved away therefrom during its pivotal movement between its end positions. Pivoting is effected by means of a movable joint which is coupled to an end segment of the swing pipe and which has an axis disposed normally to the pivot plane of the swing pipe, a fixed joint spaced from the movable joint and disposed centrally between the discharge openings which also has an axis disposed normally to the pviot plane and a guide joint which is coupled to the movable joint and is pivotable about the fixed joint.

Abstract: A novel method of injecting a back filling injection material employed in a shield-forming process is described herein. A screw type injection pump with a hopper connected to its intake port is utilized. This pump is rotated in a reverse direction to intake a back filling material into said hopper through a delivery hose connected to its delivery port. The upper limit pressure and a lower limit pressure for the injection pump are set for injection of the back filling material. The injection pump is next rotated in its normal direction to inject the back filling material to a desired location through the delivery hose, and then, after completion of the injection filling of the back filling material, the injection pump is rotated in a reversed direction again to intake water through the delivery hose, thereby washing of the hose and the injection pump can be effected.

Abstract: Transmission of a slurry along a pipeline by ultrasonic sound waves introduced at an angle to the direction of flow of the slurry particles to intersect the moving particles with a forward and lifting component. Ultrasonic generators or transducers are placed along the bottom of a pipeline at preselected angles relative to the pipeline and flow of material therealong. The ultrasonic waves are in the nature of mechanical waves and may be of a given frequency for specific types of solids. The slurry for which this apparatus is particularly adapted is a slurry of coal particles in the range of approximately 30 to 70% solids by weight with a general spatial concentration of approximately 50%. The mechanical ultrasonic waves propagating in the slurry, which is an elastic body, lift the particles by the angular components of the waves and propel the particles along the pipeline by the horizontal components of the ultrasonic waves.

Abstract: A pump and valve arrangement includes a three-way valve at the juncture of an inlet line, an outlet line and a pumping chamber. The valve comprises a generally spherically shaped flow control member rotatable in a valve body and having an arcuate slotted passage in one side thereof adapted to communicate simultaneously with either the inlet line and pumping chamber or the outlet line and pumping chamber for alternate flow of material from the inlet line into the pumping chamber and then from the pumping chamber through the outlet line. Adjustable seat sleeves extend into the body into sealing engagement with the flow control member and a journal of the flow control member extends outwardly of the valve body and has a quick release crank attachment thereon. The pump and valve are operated in synchronism with one another by respective motors controlled from position responsive switches.

Abstract: A single acting pump has a piston with an elastomeric and synthetic fabric seal ring and is provided with means to supply fluid to the piston and passages in the piston for circulating fluid to cool and clean the piston on both the pressure stroke and the back stroke. The passages in the piston include a check valve preventing flow of fluid to the back side of the piston during the pressure stroke and permitting fluid flow to the seal ring during the back stroke.

Abstract: A valve means for changing over concrete material passage is disclosed, wherein a rotational frusto-conical valve body is provided in a hopper. The interior of the valve body is provided with curved circular concrete material intake and discharge passages, the openings of which are alternatingly communicated with openings of double cylinders having pistons therein by rotating the valve body. The other end of the discharge passage is rotatably connected to a pipe to supply the concrete material into the outside of the hopper.

Abstract: A composite powder suitable for use in thermal spray applications as a wear and/or corrosion resistant coating comprising chromic oxide, magnesium oxide, iron oxide, titanium oxide, and aluminum oxide.

Abstract: An apparatus for conveying liquids mixed with solid substances to a distance is disclosed, comprising a compressed air pump formed by two or more cylindrical chambers, each provided with an inlet valve for the liquid and with a connection for the inlet and discharge of compressed air, which is cyclically and alternatively fed into and expelled from the cylinders under the control of a proper distributor, the apparatus comprising a free surface loading hopper located upstream and above the pump body, having an outlet communicating with said inlet valves of the cylindrical chambers, whereby the flow rate of the liquid arriving to the hopper is continuously compensated so as to uniformly feed the liquid by gravity to the cylindrical chambers, the apparatus further comprising at least a spare cylindrical chamber adapted to be used in substitution for one of the normally operating cylindrical chambers, for servicing and/or maintenance purposes.

Abstract: A handling system to move material and particularly manure from a collection area to a holding or storage station. The manure handling system includes a manure pump assembly having a hopper mounted over a pump housing which defines a triangularly shaped pumping chamber. An outlet valve located at the end of the chamber is urged closed by a rubber spring internally connected in the chamber. A triangular ram or piston shaped to conform to the shape of the chamber reciprocates in the pumping chamber to push manure delivered from the hopper past the outlet valve to a discharge pipe leading to a holding station. Means are provided for heating the discharge pipe and the pumping chamber, thus to permit year-round and above-ground use of the system.

Abstract: A method and a device for transport of manure under pressure through a pipe, including a mainly cylindrical housing with a piston member having a circle segment cross-section, said piston member being arranged to perform a rotary reciprocal movement in forward and reverse direction and to move manure from an inlet to an outlet communicating with a transport pipe, both sides of the piston member acting as pressure surfaces and utilized alternately depending on direction of rotation, said pressure surfaces interworking with a disc shaped valve member extending tangentially from the axis of rotation, arranged to perform a pendular movement and alternately take up contact with one of two opposed edge portions in the outlet.

Abstract: A positive displacement pump for forcing semi-fluid materials and especially concrete into a delivery pipe for transmission to a remote location, comprising a pair of parallel pump cylinders having mouths opening to a feed chamber in which a swivel valve having an S-shaped lengthwise extending material conducting passage is mounted for oscillation about a fixed axis that is equispaced from and parallel with the axes of the pump cylinders, alternately between two defined positions in each of which the mouth of one of the pump cylinders is uncovered to enable material in the feed chamber to be inducted into that cylinder by retraction of its piston and the other cylinder is communicated with the delivery pipe by means of the material conducting passage of the valve, the pump being characterized by the fact that the loads imposed on the swivel valve by the force of the discharging pump cylinder are transmitted to and carried by the bottom wall of the feed chamber by virtue of the fact that the bottom outer surfa

Abstract: A concrete pumping unit comprising a pair of parallel piston pumps, alternately placed in communication with a concrete supply conduit and with a concrete delivery pipe, through a single baffle blade valve and respectively driven by coaxial fluid pressure piston cylinders is disclosed. The cylinders are interlocked with each other by a pipe which places in communication the chambers of said fluid pressure cylinders, opposite to the chambers in which the pressurized fluid is supplied and discharged through orifices near the ends of said cylinders. A hydraulic circuit is provided for placing a fluid supply pump, in communication with the fluid pressure piston cylinder performing the suction phase, while the orifice of the other fluid pressure piston cylinder is placed in communication through another circuit including, a four-way changeover electro-valve and an actuator distributor device with a discharge reservoir.

Abstract: A pump for concrete or other moist flowable material containing aggregate, including a hopper, a pair of alternately stroking pump assemblies below the hopper for forcing concrete via a junction valve into a common output line, and a loading system for alternately charging the two pump assemblies with concrete from the hopper. The loading system includes a conveyor and a pair of generally vertical charging chambers having lower outlet ports communicating with inlet openings in the respective pump assemblies, and upper portions extending into the hopper through the lower hopper wall and terminating upwardly in open tops disposed above the highest possible level of concrete in the hopper.

Abstract: A device using only steam to simultaneously heat and pump a liquid or a slurry to a high pressure is disclosed, which device does not employ any rotating or reciprocating mechanisms commonly employed in the conventional pumping machinery. The combined use of steam for the simultaneous heating and pumping enables the outstanding device to utilize 100 percent of the steam supplied to the device in either pumping or heating. The simple structure and operational principle of said device results in particularly low capital cost and trouble-free operation.

Abstract: Volute pumps are frequently used for abrasive liquids such as in the transportation of aqueous slurrys of finely divided coal and similar materials. Since pumps for such purposes are very large, they are ordinarily made as double volute pumps to minimize radial thrust. When pumps are used for abrasive materials, the wear on the pump occurs primarily at the volute lips. In accordance with the present invention, a volute pump is provided with replaceable lips so that the lips can be replaced as they become worn. Further, the lips can be made of a much more resistant material than the body of the pump.

Abstract: Concrete pumping apparatus of the positive displacement type in which primary and secondary pumping units are actuated in a manner such that the pumping discharges from the pumping units overlap in a manner to produce a substantially constant flow delivery, the pumping units having pistons operably connected to a pivoted rocker arm having a driving connection with a main shaft, and another overriding driving connection with the main shaft which varies the driving action of the rocker arm, wherein the pivot of the rocker arm is supported on a swingable lever having its outer end operably engaged with rotatable cam means carried by the main shaft.

Abstract: The invention relates to a continuous flow meat pump which is in the form of a hollow cylindrical chamber enclosed by a top wall, a bottom wall and a side wall. There is an inlet opening in the top wall and an outlet opening in the side wall, and a movable blocking means is disposed over the inlet opening and can be moved to block, alternately, a first portion or a second portion of the inlet opening. A V-shaped wall is included in the chamber to define a V-shaped chamber portion, and the V-shaped chamber portion is disposed underneath the inlet opening. Openings extend through each of the legs of the V-shaped wall, and flap means, freely movable from one leg to another, are included between the legs in the V-shaped chamber portion. The flap means will cover the opening in one leg at any one time. A vane is disposed in the chamber outside of the V-shaped chamber portion and is movable from the outside surface of one leg to the outside surface of the other leg and back again.