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: The invention relates to a two-cylinder piston pump with a pre-compression device for concrete, slurry, and the like material. This pump has the advantage over the pumps known in the art that the pre-compression unit (3) can be flanged on at the hopper (1) in any desired angle relative to the transport cylinders (4, 4').

Abstract: A compact, relatively low cost twin piston pump (20) especially adapted for the pumping of foods (e.g. juices, puddings or particulates such as stews and chilies) is provided which includes quick detach yoke and clevis assemblies (108, 124, 110, 126) connecting the reciprocable pistons (100, 102) with their associated hydraulic cylinders (116, 118), thereby permitting quick cleanup of the machine (20). A jacking screw plate (136) is used for forward mounting of the piston and cylinder assemblies (84, 86, 116, 118) coupled with the sleeves (42, 44) and associated pistons (100, 102). This permits precise adjustment of the working components of the machine, while eliminating expensive bearings and heavy duty framing members. The pump (20) is also provided with a slide plate-type valve (38, 184) for controlling output of product from the pump (20). In one valve embodiment (184) a two-part metallic slide plate assembly (192, 200) is sandwiched between a pair of apertured nylon plates (186).

Abstract: A double acting concrete pump includes a pair of pump cylinders with a piston slidable back and forth in each cylinder, the pistons being driven in opposite directions, a connecting manifold connecting each of the cylinder outlets to a source of cement via separate pumping chambers, and a separate, removable discharge manifold for connecting the pumping chamber outlets to a delivery outlet. The discharge manifold has a discharge chamber with a pair of inlets connected to the respective pumping chamber outlets, and a single discharge outlet, with an outlet control valve in the discharge chamber for alternately isolating the flow from each of the pumping chambers to the discharge outlet in response to the pumping action.

Abstract: A compact, relatively low cost twin piston pump (20) especially adapted for the pumping of foods (e.g. juices, puddings or particulates such as stews and chilies) is provided which includes quick detach yoke and clevis assemblies (108, 124, 110, 126) connecting the reciprocable pistons (100, 102) with their associated hydraulic cylinders (116, 118), thereby permitting quick cleanup of the machine (20). A jacking screw plate (136) is used for forward mounting of the piston and cylinder assemblies (84, 86, 116, 118) coupled with the sleeves (42, 44) and associated pistons (100, 102). This permits precise adjustment of the working components of the machine, while eliminating expensive bearings and heavy duty framing members. The pump (20) is also provided with a slide plate-type valve (38, 184) for controlling output of product from the pump (20). In one valve embodiment (184) a two-part metallic slide plate assembly (192, 200) is sandwiched between a pair of apertured nylon plates (186).

Abstract: A compact, relatively low cost twin piston pump (20) especially adapted for the pumping of foods (e.g. juices, puddings or particulates such as stews and chilies) is provided which includes quick detach yoke and clevis assemblies (108, 124, 110, 126) connecting the reciprocable pistons (100, 102) with their associated hydraulic cylinders (116, 118), thereby permitting quick cleanup of the machine (20). A jacking screw plate (136) is used for forward mounting of the piston and cylinder assemblies (84, 86, 116, 118) coupled with the sleeves (42, 44) and associated pistons (100, 102). This permits precise adjustment of the working components of the machine, while eliminating expensive bearings and heavy ducy framing members. The pump (20) is also provided with a slide plate-type valve (38, 184) for controlling output of product from the pump (20). In one valve embodiment (184) a two-part metallic slide plate assembly (192, 200) is sandwiched between a pair of apertured nylon plates (186).

Abstract: A sanitary pump station for removing waste from recreational vehicle and pleasure craft waste tanks is provided. A pump station housing encloses a motor driven pump provided with at least a pair of one-way valve arrangements in both inlet and outlets to the pump. A waste hose is connected to the pump inlet and stored on a reel device within the housing. A water hose connected to an external water source is also provided. The water hose is also stored in the housing on a second reel. The respective hoses may be pulled from the housing, selectively, and after use, may be rewound on the reels by a rewind mechanism selectively engageable with drive pulleys associated with the respective reels. A universal adaptor is also provided to enable connection between the waste hose and the termination valve of the waste tank.

Abstract: An improved, hydraulically controlled pump for coarse, viscous material such as, but not limited to, concrete, and a gate mechanism for the pump.

Abstract: This invention pertains to a system for pumping a fluid of a variable consistency into a fluid container. The system includes a vacuum power assist auger to withdraw fluid upwardly from a reservoir. A hose connecting an outlet end of the power assist auger to a fluid inlet at one end of a booster pump assembly is provided to supply fluid to the fluid inlet. A fluid outlet is provided at another end of the booster pump assembly. The fluid outlet is connected to a loading pipe so that the fluid is forced by the booster pump assembly through the fluid outlet and the loading pipe to the fluid container. A vacuum is created by the booster pump assembly in the hose so that fluid of a variable consistency may be withdrawn easily from the reservoir by the power assist auger and the booster pump assembly.

Abstract: A slurry pump has slurry hopper and dual pumping cylinders. The slurry pumping members are driven by opposite-phase actuators. Each actuator has a rigid-hollow-stem partition dividing the space between the actuator plunger and the cylinder into two drive chambers of different areas selectively supplied with pressurized fluid to drive the plunger with a selected force and speed. An associated valve shuts off flow to one of the drive chambers and is controlled at any given time to occupy the same position as a corresponding valve of the other actuator. The valves coordinate supply of fluid to corresponding drive chambers on alternate strokes of two actuators.

Abstract: A pump, particularly, for pasteous masses, includes a rotatable outer wheel provided with a plurality of inner teeth, a pinion rotatable inside the outer wheel eccentrically thereto and having a plurality of outer teeth, the outer wheel and the pinion forming an intermediate space therebetween, a pressure seqment located in the intermediate space between the outer wheel and the pinion, an inlet and an outlet which are offset relative one another in direction of rotation, and a filling device connected with the inlet, the filling device including a filling container and a feeding element arranged in the filling container and having a feeding direction so as to feed a mass toward the inlet.

Abstract: A squeeze pump comprising: a casing having an arcuate inner peripheral surface; a resilient tube bent arcuately in the casing and having opposite ends projecting outwardly from the casing through openings therein; a rotary shaft disposed in an axis of the casing; and at least a pair of squeezing means mounted on the rotary shaft in the casing, the squeezing means including a pair of roller shafts extending perpendicularly to the rotary shaft, and a pair of squeeze rollers rotatably mounted on the respective roller shafts and rollable on opposite side surfaces of the resilient tube and revolvable at the same time about the rotary shaft for compressing the resilient tube from opposite sides thereof to transmit slurry in the casing, each of the squeeze rollers being divided along its axis into three independently rotatable roller sections, namely, a base end roller section constituting a base portion of the squeeze roller, a distal end roller section constituting a distal end portion of the squeeze roller, and a

Abstract: Mounted on a mobile platform, a dual hopper mixing tank having a hydraulically operated slide gate controlling the exit of a slurry. The mixed slurry is gravity fed to a pair of hydraulically operated pumps with the stroke of the pistons therein controlled by a reed switch or an IC chip. An outlet nozzle end from the pumps leads to a Y-shaped hose for supplying slurry continuously to a work site.

Abstract: A hydraulically-driven, vacuum jet apparatus is capable of drawing a liquid and solid mixture from a holding receptacle or container and of blending the mixture to provide a uniformly distributed liquid and solid solution. An intake assembly positioned on one end of an elongated tube agitates and thoroughly blends the mixture to an easily displaceable slurry using a rotating, hydraulically actuated propeller positioned outside and beyond a lower end of the tube to permit the solution to be vacuum drawn up through the tube and into a vacuum tank.

Abstract: Apparatus for removing manure from a manure pit or lagoon comprises an elongate screw-type auger having an inlet end which is inserted into the manure, and a suction hose from a vacuum wagon connected to the auger outlet. The combined action of the mechanical auger screw with the applied suction is effective in removing manure of widely varying liquid content from the pit or lagoon.

Abstract: A high volume long distance pumping system for heavy sludges and contaminated flowables utilizes a blower powered air conveyance arrangement to draw solids and air from an available source and deliver the mixture through a hose to a separator from which extracted liquids and solids enter a closed tank hopper while air from the separator is filtered and exhausted through the blower to atmosphere. The liquid/solids mixture in the closed tank hopper is delivered by a piston pump in communication with the tank hopper through a discharge line to a point of consumption or storage.

Abstract: In positive displacement pumps using double pistons for the alternating supply of pasteous material from two supply cylinders through a pivotable feed tube arranged in a feed chamber spaced at a radial distance from a controllably positionable shaft, the supply end of the feed tube is subjected to wear, which can impair the seal of the pump, and result in bleeding off of the pasteous material. In the inventive pump the supply conduit is connected to the pivotable feed tube through a pivotably arranged connecting member, through which adjustment of a sealing ring disposed in a rear wall of the feed chamber, and abutting a ring-shaped and also easily replaceable wear-resistant ring-shaped member is facilitated, while also permitting easy replacement of the sealing ring.

Abstract: A pump for applying pre-mixed cement, and similar mud-like flowable materials, employs power driven oppositely reciprocating pistons sliding in a pair of cylinders for pumping action. A control manifold, having a single cement discharge outlet, interconnects combined suction and discharge outlets of each pump cylinder with a cement supply hopper manifold inlet. Two manifold pump response chambers, and a single discharge chamber in flow communication with one another within the manifold, together with associated valving within each chamber, provides for unidirectional flow of cement under pressure from the manifold discharge outlet solely in response to the movement of the pistons within the pump cylinders. The pump response chamber valves have adjustable valve openings so that the pump may be employed with flowable materials of varying viscosity.

Abstract: The invention relates to an arrangement in plant equipment for directly supplying to a building element a binder comprising, for example, mortar of pumpable consistency and containing water. The plant equipment includes a vessel for ready-mixed binder, a motor-driven pump and a pump conduit (3) for supplying binder under pressure to a nozzle (4). In order to prevent liquid from being expelled from the binder when the pump is stopped, so as to leave a dry plug in the nozzle, means (18) are provided for maintaining the pressure in and adjacent the nozzle (4) at a level which coincides at least substantially to atmospheric pressure.

Abstract: A squeeze pump adapted to transfer a slurry with solid materials comprises a resilient tube at least partly curved along an imaginary circle, a rotary arbor situated in the center of the imaginary circle so that the curved portion of the resilient tube is equidistantly away from the rotary arbor, the rotary arbor being adapted to be rotated by power means, and at least one pair of pressing devices connected to the arbor for pressing the resilient tube. Each pressing device includes a support shaft extending outwardly from the arbor toward the resilient tube, and a presser roll freely and rotationally connected to the support shaft. The presser roll is formed of a main body and a tapered head. The two pressing devices face each other so that the innermost planes of the main bodies always facing each other are parallel and are spaced apart at a distance about twice as great as the thickness of the wall of the resilient tube.

Abstract: A positive displacement pump for slurries has a plunger reciprocating in a receprocation direction a plunger chamber. Gravity biased inlet and outlet valves control the egress and egress of slurries to the chamber. Special fittings between the valves and the chamber allow the valves to be oriented at one of four directions separated by 90.degree. angles so that the valves may be oriented so that flow is upwardly therethrough in any attitude of the plunger chamber.

Abstract: The invention relates to a device for sealing in the zone of contact between the mouths of alternately charging and discharging delivery cylinders of a concrete pump and a swinging pipe that is alternately movable to alignment in front of the cylinder that is discharging at the time. It comprises an annular seal body so supported at the mouth zone of the delivery cylinder as to be slidable between a sealing position projecting into the rear end portion of the swinging pipe and a withdrawn releasing position in which it is spaced from the swinging pipe so as not to interfere with its swinging. The seal body is maintained in its withdrawn position whenever the swinging pipe is moving, thus substantially avoiding abrasion.

Abstract: A pumping system for various flowables utilizes a dual alternating piston pump in communication with a tank hopper having flowable material inlet and delivery lines and an internal oscillating elbow conduit equipped with a pressurized wear plate which is moved cyclically into and out of registration with the cylinders of the dual alternating piston pump. A vacuum pipe rising from the tank hopper having a floating check valve and a suction shut off valve communicates with a vacuum pump external to the tank hopper through a filter. The evacuated tank hopper is enabled to fill itself immediately with flowable material and maintain a full condition while the dual alternating piston pump is pumping material through the delivery line with high efficiency. When vacuum to the tank hopper is shut off, the dual piston pump can be reversed to pump through the suction line while drawing in material through the delivery line.

Abstract: Slurry consisting of water and solid material is fed to a plurality of supply chambers arranged in parallel to each other by a low pressure slurry pump, and the filled slurry is transferred to a transferring pipe under liquid pressure of a high pressure driving liquid pump. Also, to the upper and lower portions of the supply chambers are connected driving liquid supply/discharge pipes and slurry supply/discharge pipes having valves. The valves are selectively opened/closed in accordance with a detection of a float position within each supply chamber to thereby feed the slurry continuously under pressure. Upon the slurry pressure feeding, the valves connected to the supply chamber lower portion are prevented from closing due to a packing condition.

Abstract: A displacement pump intended in particular for wearing and difficult to pump fluids such as concrete. It consists of a pump chamber (22) formed from a first tubular slide component (2) and a second similarly tubular slide component (4), with the second slide component being movably supported outside the first sliding component. As the sliding components move forwards and backwards in relation to each other, a cycle of compression and suction strokes will be produced. Inside the pump chamber (22) there is arranged a sleeve (6) of a soft, elastic material such as rubber covering the walls of the chamber and the contact surface between the two slides (2, 4). The sleeve (6) is free along essentially the entire distance between its attachment points (3, 5).

Abstract: An apparatus for mixing and pumping manure from a reservoir including an elongated frame adapted to be pivoted from a vehicle bed from a lying position to an upright position within a reservoir to be pumped. Pump means are provided at the base of said elongated frame communicating with a conduit extending the length of the frame, a first slurry mixing impeller adjacent the pump at the base of the frame and driven by a common shaft with the pump, a second mixing means in the form of a screw having an axis of rotation parallel to the elongated frame and having a common drive shaft with the impeller and the pump and a third mixing device in the form of a jet nozzle communicating with the pump at the base thereof and being spaced from the second mixing means. The first and third mixing means have jet nozzles directed at right angles to the axis of the elongated frame.

Abstract: A slurry pump having a pair of cylinders aligned one on either side of a centrally-disposed oscillating-deflector element; each cylinder has a housing in which are defined co-axial, registering hydraulic and slurry cylinder bores, and a piston rod having, at one end thereof a hydraulic piston head slidably movable within the hydraulic cylinder bore and having, at its other end a slurry piston head slidably movable within the slurry cylinder bore.

Abstract: A slurry pump has a hopper containing slurry. A pumping cylinder containing a piston communicates with the hopper through the hopper wall. A delivery tube is swung into and out of register with the cylinder. Slurry is drawn into the cylinder by the piston and out through the delivery tube. The pump is controlled by a lever which has a central neutral position and two operating positions.Dangerous moving parts are covered by a guard mounted on hinges. An arm on the guard engages a slide which has a channel. If the guard is moved from its closed position, the arm slides the slide so that the control lever enters the channel and moves to its neutral position. The external moving parts include releasable clamping means for sealing the junction of the delivery tube and the cylinder while slurry is being transferred from the cylinder to the tube.

Abstract: A concrete pump comprises a water rinsing box, a valve housing and a pair of concrete pump cylinders there-between. The rinsing box and the valve housing are welded at opposite ends of rigid connecting means such forming a rigid undetachable structure in which the cylinders are removably fastened and can be drawn out through the valve housing after removal of a housing closure flap.

Abstract: A twin cylinder pump for viscous materials such as concrete, having a guide for a cutting ring producing a sealing effect on the cylinder and a seat for supporting a loaded spring ring of elastic material of rubber or the like, is so designed that the ring is acted upon by the pressure of the feed taking effect in the ring-like gap, open as far as supporting face or seat of the spring, between the cutting ring and the valve member. Furthermore there is a guiding and constraining means for the ring taking effect thereon between the radial faces against which it is rested.

Abstract: A part of the driving liquid discharged from an outlet pipe for driving liquid is supplied, under the control of a first flow control means, to a slurry tank in accordance with the amount of the solid matter supplied thereto, so that the concentration of slurry may be kept at all times to be constant. Further, a clean liquid is supplied, under the control of a second flow control means, in accordance with the amount of driving liquid supplied to the slurry tank.

Abstract: A dual-unit pump, e.g., a rolling diaphragm piston pump, suitable for pumping an abrasive high-viscosity slurry, is adapted to operate at a constant flow rate by means for detecting and correcting a pressure differential in the two units before the units switch from the pumping cycle to the filling cycle and vice versa. The flow of liquids is controlled by valves of the type which switch the flow to and from the units with essentially no volume change in the liquid inlet and outlet lines.

Abstract: Slurry consisting of water and solid material is fed to fill a plurality of supply chambers arranged in parallel to each other, by the action of slurry pump. The filled slurry is forced to a transferring pipe by the liquid pressure of a high pressure driving liquid pump. A float is positioned on an interface between the slurry and driving liquid within the supply chamber. When a sensor for detecting the position of the float is inoperative due to an external turbulence or the like, a command signal is applied to selected valves in response to a period of time set in a timer.

Abstract: Concrete is transmitted from a hopper forming a part of a mobile concrete pumping apparatus to the deposit site through a flow line having a Y-pipe inlet. The pumping apparatus includes two piston-cylinder concrete pumps mounted in side-by-side relationship adjacent the hopper, which has an auger to rapidly charge a pump with concrete through one of two discharge pipes. Each pump is pivotally mounted, to locate the cylinder aligned with the discharge pipe or with one inlet of the Y-pipe inlet. Each pump has a valve plate pivoting with the cylinder to alternately close the hopper opening and the inlet line. Hydraulic cylinder units are coupled to the valve plates to pivot the pumps. A floating valve plate has coupling pipes attached to the hopper and a hydraulic cylinder urges the same into sliding sealing engagement with the rotating valve plate.

Abstract: The apparatus comprises a centrifugal pump (1) fed by a screw feeder (8). The screw feeder comprises a screw (9) with a partially open thread (11). The screw (9) is driven separately in opposed direction to and with a lower speed than the impeller (3) of the pump (1). By this arrangement pulp of high concentration can be pumped.

Abstract: A piston pump has suction and pressure valves, a valve through-chamber extending between the valves, a working chamber with a piston reciprocal therein, and a force-transmitting chamber communicating with the working chamber and accommodating a force-transmitting medium, wherein the valve through-chamber and the force-transmitting chamber are formed as parts of a common chamber and located adjacent to one another.

Abstract: A positive displacement pump has a cylinder closed at one end and a plunger projecting from the opposite end reciprocable therein. Rings and packing are inserted at the opposite end to guide the plunger and are designed to provide that the plunger has a material clearance from the cylinder walls. To use a different sized plunger the rings and packing are designed for easy removal at the end of the cylinder and for replacement by rings and plunger corresponding to the new plunger section. A convenient manual linkage is provided for manual operation of the pump with the cylinder upright. A convenient horizontal frame is provided for the pump with a drive means for the pump used with the cylinder in a horizontal position.

Abstract: Apparatus for pumping fluent solid material comprising first and second expansible chamber pumps and means interconnecting the pumps. The first expansible chamber pump has an inlet with a check valve for intake of material from a supply thereof on an intake stroke of the first pump and an outlet with a check valve for discharge of the material on a discharge stroke of the first pump. The apparatus also has a line for delivery of material from the outlet of the first pump. The second expansible chamber pump has an inlet with a check valve for intake of gas on an intake stroke of the second pump and an outlet with a check valve for discharge of gas on a discharge stroke of the second pump. Means interconnect the pumps for operation of the second pump through a discharge stroke on an intake stroke of the first pump and through an intake stroke on a discharge stroke of the first pump.

Abstract: An oscillating displacement pump particularly adapted for pumping a viscous and abrasive fluid medium or one loaded with solid particles. The pump includes a connecting space located outside of a displacement unit and directly connecting a suction valve space with a pressure valve space so that the geodetic height of pumped medium increases. The connecting space defines a suction valve side connecting channel and a pressure valve side connecting channel connected at any given time with each other through the displacement unit space independent of the position of the displacement unit. The pumped medium can thus be moved through the pump from the suction valve to the pressure valve without diversion in a separate connecting space reducing abrasive wear on the pump. A number of additional advantageous features of the pump are disclosed.

Abstract: An apparatus for maintaining a continuous supply of cementitious material such as stucco or plaster on the hawk of a workman skilled in applying said materials to surfaces with a trowel. Cementitious material stored in bulk in a hopper remote from the workplace is pumped from said hopper through hose to the hawk of the skilled workman. The flowing lines are free of restrictions or valves and the flow is metered at its source by means of a radio transmitter controlled by the workman applying the cementitious material. Said radio transmissions activate the flow according to the needs of the workman.

Abstract: An apparatus for oscillating a distribution duct between two outlets of adjacent pump cylinders and a common discharge pipe. A portion of the apparatus pivots with the discharge pipe and cooperates with a stationary housing to relieve thrust loads imparted during the pumping operation. A movable hopper is employed to feed material to the pumps and facilitate access to internal portions of the hopper for cleaning.

Abstract: A pump assembly has a hopper adapted to hold a wet concrete 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 are operable to draw portions of the mass out of the hopper and expel them 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 and a distributor pipe in the hopper has a front end fitted and aligned with the front port and a rear end engageable over and alignable with either of the rear ports. A buttress formation fixed on front end of the distributor pipe defines outside the hopper a buttress plane parallel to the front and rear planes.

Abstract: The valve has a shutter mechanism which is movable within a housing and is provided at one end with at least one inlet which is movable across one or more housing openings and at the opposite end with an outlet surrounded by a sealed contact joint which is movable across a delivery pipe opening in the housing. This sealed contact joint surrounds the delivery pipe opening in the housing and contacts either the inside wall of the housing or a face plate arranged on the inside wall of the housing in all intermediate and final positions of the shutter mechanism. With the aim of reducing wear and producing a permanent seal, the sealed contact joint is in the form of a compressible sealing ring with a slotted or kidney-shaped cross-section which serves to wipe the flat and smooth face plate or inside wall of the housing.

Abstract: A fluid passage change over valve unit for use in concrete pumps wherein a passage change over valve member located within a hopper is connected at its outlet port to a delivery line for pivoting about the latter so that an inlet port thereof is swung to alternately communicate with a pair of piston pumps having pump openings into the hopper. The valve unit is provided with a pair of guide members disposed along both sides of the valve member. One end of each guide member opens upwards and the other end is disposed to come into alignment with the opening of corresponding one of the piston pumps for guiding a fluid concrete within the hopper to the one pump when the valve member communicates with the other pump.

Abstract: A two-cylinder pump for heavy flowable materials, such as concrete, comprising a shutter mechanism which is pivotable across an apertured face plate, the shutter mechanism being sealed against the face plate by means of a cutting ring which is axially movable relatively to the shutter mechanism and is supported thereon with its rear side engaging a rectangular-section flexible rubber ring, whereby the cutting ring is urged resiliently against the face plate, means for locating the cutting ring, along a portion of its length, on the shutter mechanism, a seating for the flexible ring on the cutting ring which includes an annular extension which partly overlaps the longer cross-sectional side of the flexible ring in the axial direction, a seating for the flexible ring on the shutter mechanism which includes an annular extension which partly overlaps the longer cross-sectional side of the flexible ring in the axial direction, said annular extensions partly overlapping the ring from opposite sides thereof so that

Abstract: Slurry is transferred to a high pressure region by pushing the slurry from the bottom of a transfer vessel with a pressurizing liquid admitted into the top of the vessel. While the pressurizing liquid is being introduced into the transfer vessel, pressurizing liquid which has mixed with slurry is drawn off from the transfer vessel at a point between its upper and lower ends.

Abstract: A method and apparatus for pumping fluids, especially viscous and/or abrasive fluids, are disclosed. The method comprises using one working fluid to pump an intermediate working fluid, which may be different from the first working fluid, through a conduit system in a smooth and continuous pulsating manner. The intermediate fluid pumps the process fluid through the actual pumping zone. Heat exchange between the intermediate and process fluids may be effected, e.g. by counterflow. The preferred apparatus comprises a hydraulically operated displacement pump. A tubular diaphragm pump is coupled in-line in a pipe line. The tubular diaphragm pump includes a housing coupled to the pipe line, and a tubular diaphragm coupled to the housing in such a manner that the process fluid flows from the pipe line, through the interior of the tubular diaphragm and back into the pipe line. A check valve insures that the process fluid passes through the tubular diaphragm in a single direction.

Abstract: Apparatus is shown for feeding a slurry to a pressurized housing. An impeller that includes radial passages is mounted in the loose fitting housing. The impeller hub is connected to a drive means and a slurry supply means which extends through the housing. Pressured gas is fed into the housing for substantially enveloping the impeller in a bubble of gas.

Abstract: A two-cylinder pump for heavy flowable materials, such as concrete, comprising a shutter mechanism which is pivotable across an apertured face plate, the shutter mechanism being sealed against the face plate by means of a cutting ring which is axially movable relatively to the shutter mechanism and is supported thereon with its rear side engaging a rectangular-section flexible rubber ring, whereby the cutting ring is urged resiliently against the face plate, means for locating the cutting ring, along a portion of its length, on the shutter mechanism, a seating for the flexible ring on the cutting ring which includes an annular extension which partly overlaps the longer cross-sectional side of the flexible ring in the axial direction, a seating for the flexible ring on the shutter mechanism which includes an annular extension which partly overlaps the longer cross-sectional side of the flexible ring in the axial direction, said annular extensions partly overlapping the ring from opposite sides thereof so that

Abstract: The valve has a shutter mechanism which is movable within a housing and is provided at one end with at least one inlet which is movable across one or more housing openings and at the opposite end with an outlet surrounded by a sealed contact joint which is movable across a delivery pipe opening in the housing. This sealed contact joint surrounds the delivery pipe opening in the housing and contacts either the inside wall of the housing or a face plate arranged on the inside wall of the housing in all intermediate and final positions of the shutter mechanism. With the aim of reducing wear and producing a permanent seal, the sealed contact joint is in the form of a compressible sealing ring with a slotted or kidney-shaped cross-section which serves to wipe the flat and smooth face plate or inside wall of the housing.