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: A high pressure meter pump system with improved accuracy is provided by subdividing a large meter pump capacity into metered subvolume charges which are incrementally delivered to a high pressure slave pump.This enables the pump sytem to achieve improved accuracy independent of flow rate and therefore increasing the range of flow rates available with acceptable accuracy. Additionally, the pump system self-primes independently of flow rate and therefore does not require degassing of the solvent being pumped.

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 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: In the use of fuel injection pumps, a distributing rotor is often utilized to sequentially deliver fuel from an inlet to a combustion chamber on an engine in combination with one or more reciprocating high pressure pistons. Due to the positioning of the various passages through which the fuel is directed, cavitation of the pump is often experienced which has a very serious effect on the life of the components within the pump. The fluid distribution apparatus of the present invention provides a single delivery passage between the pumping chambers of the reciprocating pistons and the distributing rotor. With this arrangement, fluid that is communicated from the bore to the pumping chambers in response to the intake stroke of the pistons is directed back through the same passage during the pressurization stroke of the pistons. The positioning of the single delivery passage prevents the fuel injection pump.

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: Previously disclosed distributor fuel injection pumps for internal combustion engines offer the advantages of reduced size, weight, and cost of a fuel injection system. However, these pumps have not been able to provide relatively high fuel injection pressures which could improve fuel combustion for better fuel economy and lower noxious emissions. In contrast, the subject distributor fuel injection pump generates relatively high fuel injection pressures in a relatively compact arrangement. A semi-spherical nutator member freely rotatably mounted on an oblique journal of a drive shaft imparts high speed harmonic motion to at least one reciprocating pump plunger for pressurizing the fuel. A relatively large semi-spherical bearing interface between the nutator member and a pump housing accommodates very high pumping reaction loads.

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: An improvement for a variable volume device in the form of a rectilinear case having disposed therein a rectilinear outer piston structure and a rectilinear inner piston structure within the outer piston structure, the inner piston being carried for rotation on a crank shaft and in turn inducing a reciprocal movement of the outer piston structure in the case, the improvement comprising rollers positioned between the outer piston structure and the case, and the inner piston structure and outer piston structure to facilatate thrust and force accomodation therebetween, and sealing strip means positioned in sealing relationship between the outer piston structure and rectilinear case, and inner piston structure and outer piston structure, and particularly an embodiment in which the sealing strips means of the inner piston structure bear against the side portion of the outer piston structure sealing ring means and a bearing plate positioned to support the rollers, whereby the rectilinear innerrunning pistons may be

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: A peristaltic pumping system in which a length of elastic tubing connected at opposite ends to storage spools is advanced alternately in opposite directions through a pinch roll pair and in which opposite ends of the elastic tubing are connected in fluid communication alternately with pump intake and pump discharge conduits by a reversing valve. The valve is adjusted by means dependent on the direction of tubing travel through the pinch roll pair. The system is preferably incorporated in a cassette-like enclosure which may be removable received in a drive console. Alternately, the system may be self-contained in an enclosure adapted to be implanted in an animal body.

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: An annular piston is received within a suitably dimensioned cylinder and reciprocally driven to pump fluid on both piston strokes to a fluid carrying line with which the pump is arranged in an in-line relationship. A centrally located shuttle-valve alternately opens and closes ports at opposite ends of the pump cylinder to accomplish the required in-line valving for the pump.

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 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: 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 fluid operated pump for concrete and similar materials comprising a pair of piston-cylinder units connected to a concrete housing having a single valve for controlling the charging and discharging of the material. The valve control element and the concrete housing are defined in a mating relationship for minimizing flow restrictions of the material moved through the housing. Other efficiencies in the fluid circuit structures and arrangements are provided.

Abstract: A water sampler for delivering simultaneous multiple samples in which the samples are taken and discharged by a plurality of glass chambered syringes driven by a crank with water flow being controlled by a glass chambered valve having a valve spool shifted under the control of the crank.

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 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 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 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 system for protecting a machine against thermal overload, in particular, a compressor, and more particularly still, in respect of thermal protection of the valving of a compressor. The compressor is provided with a heat sensitive element in close proximity to the valving and in good heat exchange relation with gas passing through the valving, particularly, the gas being discharged through the valving. The heat sensitive element is connected in controlling relation to the drive motor for the compressor.

Abstract: The present valve is especially adapted for use in conduits through which construction mixtures, such as concrete mixtures, flow. The valve cooperates with a pump having pistons in two respective pump cylinders. A valve housing forms a valve piston chamber having plane walls. The valve plug or piston has also plane walls to fit into the valve chamber with respective plane walls. Three pairs of ports are provided. One pair is connected to the pump cylinders. Another pair is connected to a discharge conduit and a third pair is connected to a supply container for the concrete mix. Preferably, the cross sectional shape of the valve chamber and of the piston plug is triangular. However, the cross sectional shape may also form a quadrangle. Providing the valve chamber and the valve plug piston with plane walls facilitates the manufacture of the valve and improves its sealing characteristics.

Abstract: A distributing valve for twin cylinder pumps for pumping viscous materials such as concrete, has an oscillating body with closing elements, for the suction orifices and pressure orifices for the pump cylinders mounted on a shaft disposed outside the part of the pump casing acted upon by the pump pressure. The closing elements are arranged on the same side of the rotating shaft and a pair of closing elements is provided either for the suction orifices or for the pressure orifices.

Abstract: This disclosure relates to a pumping apparatus that includes a hopper for receiving concrete with a delivery line extending from the hopper and a cylinder cooperating with the hopper to deliver concrete to the delivery line. A valve has an outlet end connected to the delivery line and is pivoted within the hopper between two positions to alternately connect the cylinder to the delivery line and to the hopper for delivering concrete to the delivery line and then withdrawing concrete from the hopper for subsequent delivery. An adjustable wear plate is located adjacent the inlet end of the valve so that continuous contacting engagement can be maintained between adjacent surfaces of the valve and the plate. The valve also has rigidifying means associated therewith and is supported on the hopper in a manner to prevent distortion during movement thereof.

Abstract: A system for metering and pumping a plurality of fluids is diclosed. The system includes a pumping stage which has a plurality of piston pumps extending from a rigid support to a rack hinged at one end. A valve stage is provided having a valve body with an internal rotatable valve spool. The valve body has several sets of inlet, outlet and common ports communicating with the valve spool, the common ports being connected to the respective pumps. One set of ports is provided for such fluid to be metered and pumped. For each set of ports, the valve spool has a flat portion and a circumferential indentation integral to the flat portion. Alignment of a flat portion of the valve spool with an inlet port of the valve body allows fluid to pass from a supply to the respective pump, and alignment of the flat portion with an outlet port allows the fluid to pass from the pump and out through the outlet port.

Abstract: An improved valve assembly providing a constant flow of semi-fluid concrete material through a concrete-pump assembly having a hopper to receive the concrete material and a plurality of hydraulically-actuated concrete pumps operably communicating with the hopper through inlet ports disposed in one wall of the hopper, the valve assembly being operably mounted within the hopper to oscillate therein. The valve comprises a main conduit for selective communication with the inlet ports, and a second conduit connected to the main conduit at one end thereof, the opposite end thereof being rotatably supported in the hopper wall and adapted to be connected to one of the hydraulic pumps. The main conduit together with the second conduit form a substantially Y-shaped configuration whereby the valve oscillates about the axis of the second conduit.