Abstract: A system for compressing hydrogen gas may include a compression stage with a water lubricated and sealed compressor, a gas-liquid separation stage, and a drying stage with an adsorption-type gas dryer. The system receives hydrogen gas via an inlet and discharges dry compressed hydrogen gas via an outlet. The system has an encapsulating vessel defining a cavity within which the separation stage and drying stage are located.

Abstract: A cooling block for cooling pistons of a multi-cylinder air compressor is disclosed. The cooling block may comprise a body including a first end and a second end on opposing sides of the body. The cooling block may further comprise a first cooling nozzle near the first end, and a second cooling nozzle near the second end. The first cooling nozzle and the second cooling nozzle may each include an orifice through which coolant is sprayed into a crankcase of the multi-cylinder air compressor.

Abstract: This method is used to manage a pressure accumulator (1) as a component of an energy storage system, consisting of a work machine (4), a collecting tank (7), a displacement apparatus (6) and a pressure accumulator (1) for storing a pressurised gaseous medium. The pressure accumulator (1) is partially filled with a liquid medium so as to be able to control the gas storage volume therewith. Feeding compressed gas (3) into the pressure accumulator (1) involves removing liquid (2). Removing compressed gas (3) from the pressure accumulator (1) involves feeding in liquid (2) so that the storage pressure is kept under control as necessary, in particular is kept constant. To this end, one pressurised unit of gas (3) is introduced into the pressure accumulator (1) with the removal of one unit of liquid (2) from the pressure accumulator (1) by means of the displacement apparatus (6) and vice versa.

Abstract: The present disclosure provides an automatic microfluidic system for rapid personalized drug screening including a microfluidic chip. The microfluidic chip includes a fluid storage unit, a fluid driving unit, a reaction unit and a plurality of valve units. The fluid driving unit includes two mixing pumps. Each of the mixing pumps includes two pneumatic micro-pumps, a mixing chamber and a blocking structure. The blocking structure is disposed in the mixing chamber and is connected between the two pneumatic micro-pumps. When the two pneumatic micro-pumps are started alternately, the blocking structure is deflected alone with the operation of the two pneumatic micro-pumps.

Abstract: Certain aspects and features of the present disclosure relate to systems and methods that generate machine-learning models to predict whether user devices are likely to meet defined objectives. For example, a machine-learning model can be generated to predict whether or not a user device is likely to access a resource. In some implementations, a semi-supervised model can be used to determine to what extent user devices are predicted to satisfy the defined objective(s). For example, a resource-affinity parameter can be generated as a result of inputting various data points into a semi-supervised model. The various data points can be access from a plurality of data sources, and can represent one or more activities or attributes associated with a user. The value of the resource-affinity parameter can be evaluated to determine the extent to which the user is likely to meet an objective.

Abstract: Apparatus and methods for energizing well operations fluids, including a fluid energizing device directly or operatively connected between first and second conduits. The fluid energizing device includes a chamber. A first fluid enters the chamber from the first conduit, and a second fluid enters the chamber from the second conduit and energizes the first fluid within the chamber. A third conduit conducts the energized first fluid from the chamber to a wellhead.

Abstract: A method that includes introducing a first fluid at a first flow rate into a first end of a channel of a hydraulic energy transfer system, introducing a second fluid at a second flow rate into a second end of the channel opposite the first end, wherein the first flow rate is lower than the second flow rate, and operating the hydraulic energy transfer system to output a third fluid comprising the first fluid and a portion of the second fluid and exhibiting a step-change in concentration of the first fluid. The first fluid is proppant slurry introduced at a first pressure, the second fluid is a clean fluid introduced at a second pressure higher than the first pressure, and third fluid is a fracturing fluid exhibiting the step-change in proppant concentration. The hydraulic energy transfer system includes a rotary isobaric pressure exchanger.

Abstract: A first diaphragm which forms a wall of a first pump chamber is provided in the double diaphragm pump according to the invention, wherein the first diaphragm can be moved by means of a first driving means. In addition, a second diaphragm which forms a wall of a second pump chamber is provided, wherein the second diaphragm can be moved by means of a second driving means. What is more, a control for the driving means is provided, said control being designed and operable such that it controls the two driving means subject to one or a plurality of conditions.

Abstract: Various embodiments of the present disclosure are directed towards free-piston combustion engines. As described herein, a method and system are provided for displacing a free-piston assembly to achieve a desired engine performance by repeatedly determining position-force trajectories over the course of a propagation path and effecting the displacement of the free-piston assembly based, at least in part, on the position-force trajectory. In a dual-piston assembly free-piston engine, synchronization of the two piston assemblies is provided.

Abstract: A system including a rotary isobaric pressure exchanger (IPX) configured to exchange pressures between a first fluid and a second fluid, and a motor system coupled to the hydraulic energy transfer system and configured to power the hydraulic energy transfer system.

Abstract: A system including a rotary isobaric pressure exchanger (IPX) configured to exchange pressures between a first fluid and a second fluid, and a motor system coupled to the hydraulic energy transfer system and configured to power the hydraulic energy transfer system.

Abstract: A pressure-driven metered treating chemistry dispensing pump for a laundry treating appliance having a housing having first, second and third chambers, with the first and second chambers each in fluid communication with the third chamber; a fluid inlet fluidly coupling a first fluid to the first chamber; an outlet fluidly coupled to the third chamber; a piston disposed in the housing; wherein, when the piston moves in a first direction in response to the first fluid entering the first chamber via the fluid inlet, the second chamber decreases in volume thereby ejecting at least some of the second fluid from the second chamber into the third chamber, and when the piston moves in a second direction, different from the first direction, the first chamber decreases in volume thereby ejecting at least some of the first fluid from the first chamber into the third chamber to mix the at least some of the first fluid and the at least some of the second fluid to form a mixture in the third chamber, which can be emitted t

Abstract: Described are a gradient system and method, wherein at least two fluids are mixed in accordance with a noise level threshold. An inlet receives the fluids. A pump head body has a mixing chamber therein in communication with the inlet. The mixing chamber has a first delay volume configured to mix the fluids having a noise level. A pump head extension has a mixing chamber extension therein extending from the mixing chamber. The mixing chamber extension increases the volume of the mixing chamber by a second delay volume to a third delay volume. The fluids are mixed in the third delay volume at a compositional noise level that is less than the noise level.

Abstract: A system includes a rotary isobaric pressure exchanger (IPX) configured to exchange pressures between a first fluid and second fluid. The rotary IPX includes a first end cover including a first fluid aperture configured to route the first fluid. The rotary IPX also includes a first piston integral with the first end cover. The first piston includes a first hydraulic path configured to route the first fluid to or from the first fluid aperture.

Abstract: A method of compressing gas includes maintaining a volume of gas at a first pressure within a first chamber. Pressurized liquid is forced into the first chamber through a nozzle having a curved profile. Based on the Coanda effect, the liquid compresses the volume of gas to a second pressure greater than the first pressure. The liquid is separated from the gas in a second chamber while maintaining the gas at the second pressure to provide compressed, dry gas.

Abstract: An example pressure-driven metered mixing dispensing pump includes a housing, a fluid inlet, a piston disposed in the housing at least partially defining first, second and third chambers, the first and second chambers each in fluid communication with the third chamber, the piston to, in response to first fluid entering the first chamber via the fluid inlet, move in a first direction to decrease the volume of the second chamber thereby ejecting second fluid from the second chamber into the third chamber, a spring to move the piston in a second direction to decrease the volume of the first chamber thereby ejecting at least some of the first fluid from the first chamber into the third chamber thereby mixing the at least some of the first fluid and the second fluid to form a mixture, and an outlet to discharge the mixture from the third chamber.

Abstract: In processes and systems utilizing a compressor to fill a vessel with gas, for example, in the filling of the fuel tank of a vehicle that operates on compressed natural gas (CNG), a number of advantages are realized by establishing independent control over the flow rate of gas discharged from the compressor, such as on the basis of the compressor discharge pressure, utilizing feedback from one or more gas pressure sensors. In representative embodiments, a detected or actual measured compressor discharge pressure can serve as a process variable, in a feedback control loop for regulating the output of the compressor.

Abstract: A pump for a dialysis machine, the pump having a pump chamber and a deformable membrane actuable to pump a fluid from the pump chamber, the pump chamber being substantially conical such that the membrane is actuated to extend into the conical chamber in order to pump the fluid from the chamber.

Abstract: The invention relates to a device which comprises a gear change fork (1), a hydraulic cylinder including a stationary cylindrical spindle (2) with a stationary transverse wall (3) projecting from said spindle (2) and a piston that is translatably movable by sliding over said transverse stationary wall (3). The piston consists of a piston body (4) closed by a radial closing part referred to as a “plug” (5) so as to define two inner chambers (6, 7) of the cylinder, which are situated on either side of said stationary transverse wall (3), respectively. Means for pressurizing both of the two cylinder chambers (6, 7) are provided for moving the movable piston (4, 5) in one direction or another. In the device according to the invention, the piston body (4) is directly built into the gear shift fork (1) whereby, as a result of the pressure in a cylinder chamber (6, 7), it is the fork (1) that moves translatably.

Abstract: Methods and apparatus for mixing and applying a bead of material. For example, the bead of material can be used to seal gaps cracks and seams of a building. The apparatus includes a supply machine and an applicator. The supply machine provides each of the parts of the material to the applicator at a controlled rate. The applicator mixes the parts of the material at a nozzle. The applicator provides a bead (rather than spraying) of the mixed material through the nozzle. The bead of material may be applied in a precise manner to seal gaps, cracks and seams of an existing building and/or the bead may be provided during new construction of a building between components of the building.

Abstract: The power plant disclosed is an engine that derives is usefulness in the pursuit of energy generation by utilizing natural pressure differentials found in various liquids and gases, such as but not limited to water and air. It is generally a two-stroke piston cycle engine, wherein the actions of the pistons perform work or replenish working fluid from a lower head to a higher head, and can be utilized to generate power, pump fluids, or perform work, for example.

Abstract: Irrigation fluid is aspirated from an eye and through an aspiration instrument by operating a vacuum pump, including moving first and second plungers between respective suction strokes and discharge strokes. Vacuum pressure at an input side of the pump is maintained at a desired vacuum pressure setting by controlling speeds and directions of the plungers, and controlling positions of input and output valves communicating with cylinders in which the plungers move. Controlling is based on the pressure setting and measured pressures in the cylinders. Vacuum pressure is maintained while transitioning from the suction stroke of the first plunger to the suction stroke of the second plunger, by synchronizing respective positions of the plungers and the valves, such that initiation of the suction stroke of the second plunger during the transitioning is delayed until a vacuum pressure in the second cylinder is equal to a vacuum pressure in the first cylinder.

Abstract: An actuator assembly for generating a fluid pressure and applying the fluid pressure to a first device. The actuator assembly comprises a first fluid chamber and a first piston disposed adjacent to the first fluid chamber, a second fluid chamber and a second piston slidably received in the second fluid chamber, a fluid passage connecting the first fluid chamber with the second fluid chamber, and an actuator motor for selectively reciprocating the first piston so that axial movement of the first piston generates a fluid pressure within the first fluid chamber. The first piston is disposed within the actuator motor. As the first chamber is fluidly communicating with the second fluid chamber, the linear motion of the first piston causes corresponding linear motion of the second piston for applying the fluid pressure to the first device.

Abstract: A reciprocating compressor provided with a piston, which is compact and having high sealing performance is provided. A reciprocating compressor includes: a low-pressure compressor unit having a low-pressure piston and a low-pressure cylinder for compressing air with the low-pressure piston reciprocating while oscillating within the low-pressure cylinder; a high-pressure compressor unit having a high-pressure piston and a high-pressure cylinder for further compressing the air compressed in the low-pressure compressor unit with the high-pressure piston reciprocating while oscillating within the high-pressure cylinder; and a motor for driving the low-pressure compressor unit and the high-pressure compressor unit. A maximum tilt angle during oscillation of the low-pressure piston is made larger than a maximum tilt angle during oscillation of the high-pressure piston.

Abstract: A hydraulic jack including a frame and a pump connected to the frame. The pump includes a rod, a housing, a piston and a plurality of valves. The rod has a cross-sectional area. The housing has an end through which the rod slides. The piston is associated with said rod, with the piston establishing a rod side chamber and a piston side chamber within the housing. The piston having a cross-sectional area. The plurality of valves each are fluidly connected to the rod side chamber and/or the piston side chamber. The piston, the rod and the valves are arranged to provide a first hydraulic fluid flow associated with the cross-sectional area of the piston until a predetermined pressure is reached and a second hydraulic fluid flow associated with the cross-sectional area of the rod after the predetermined pressure is reached.

Abstract: This invention is a pressure control valve unit including: a unit substrate; a first valve chamber provided at one side of the unit substrate, forming a part of a first liquid flow-path; a second valve chamber provided at the other side of the unit substrate, forming a part of a second liquid flow-path; a first opening-closing valve provided in the first valve chamber; and a second opening-closing valve provided in the second valve chamber. The first liquid flow-path and the second liquid flow-path are formed independently of each other. A pressure of a liquid flowing in the first liquid flow-path and a pressure of a liquid flowing in the second liquid flow-path can be controlled at respective predetermined pressures independently of each other.

Abstract: The invention relates to a stuffing-dosing machine which comprises a container (1) which receives the food material and which is subjected to a vacuum (V), means for removing and impulsing the food material towards compaction-stuffing cavities, two alternating stuffing cylinders (2) and a rotary collector valve (9) synchronized with said cylinders for the selective collection and distribution of material to an outlet conduit. Piston heads (5) of the cylinders (2) are inside the container (1), the first portion (B) of the stroke (A) of the cylinder (2) taking place in a narrow area (1a) of the container (1) wherein the piston heads (5) stir and impulse the food material and a second portion (C) of the stroke (A) takes place inside stuffing-dosing chambers (4) in the lower terminal portion of the container (1) of which the internal walls match the piston heads (5) and of which the stuffing-dosing chambers (4) are adjacent to the compaction-stuffing cavities.

Abstract: A diaphragm piston pump with n (at least two) pump chambers each defined by a diaphragm, for mounting on a drive mechanism with n pistons, wherein the pump head with the diaphragms, the pump chambers and with covers is placed on the drive mechanism. The pump head is divided into n+l pump head elements which are arranged next to each other in a row in such a way that the respectively second pump head element forms the cover as well as the pump chamber for the previously arranged pump head element on which it is mounted, wherein the diaphragms are braced between the pump head elements and are aligned essentially parallel to the longitudinal axis of the pistons.

Abstract: The invention comprises an improved pressure transfer module having, in one embodiment, two double-diaphragm pumps each having its diaphragms connected to one another by a respective drive shaft for reciprocating motion. Spool valve assemblies are mounted directly on the connecting shafts of each pump and arranged to maintain the operation of the two diaphragms of the pumps 90.degree. out of phase in that each such assembly constitutes pressurized water control valves for the other pump. The two pumps are mounted with the drive shafts at 90.degree. to one another, and arranged to pump in sequence so that a complete pumping cycle comprises four pumping strokes, one every 90.degree.. To insure reversal of motion of the shafts in proper phase, the invention includes either two, meshed square cams and cam surfaces formed on respective shafts connecting the pumping surfaces, or a floating crankshaft with each end pivoted in one of the connecting shafts.

Abstract: A superhigh pressure generator system is provided which comprises first, second and reserve boosters 1, 2, 3 which are respectively provided with a plunger chambers 4a, 4b, 4c within single rod-type oil hydraulic cylinders 7a, 7b, 7c on the plunger side and are operative to pressurize water sucked into the respective plunger chambers to superhigh pressure, the boosters being connected in parallel each other to a water discharge line 9 via check valves 6a, 6b, 6c respectively. First, second and reserve 3-position directional control valves 13, 14, 15 are interposed between the oil hydraulic cylinders 7a, 7b, 7c of the respective boosters on one hand and first and second oil hydraulic pumps 11, 12 on the other hand so as to permit a reciprocating motion of the oil hydraulic cylinders. On-off valves 20, 21, 23, 22 are respectively provided on discharge lines 17, 18, 19, 16 which connect the three-position directional control valves 13, 14, 15 to the first and second oil hydraulic pumps 11, 12.

Abstract: Method and apparatus for compressing gas. Two accumulators are alternately filled with gas from a gas-supplying conduit, and the gas is forced out of one end of the accumulators into a gas-receiving conduit by liquid forced into the other end of the accumulators. A reversible pump moves liquid from one accumulator to the other accumulator. The reversible pump is connected so that pump cavitation is prevented. The invention includes a switching system to switch liquid flow from one accumulator to the other accumulator. Liquid that leaks from the system may be resupplied using a liquid supply system that comprises a pressure container with a compressible element.

Abstract: A piston pump for conveying fragile particulate food products without damaging the product. The pump includes a filler and a discharge conduit containing piston valves actuated by hydraulic cylinders. The pumping chamber in which the product is compressed is equipped with a linear displacement transducer/magnet sensor which senses not only the position, but the speed of the piston. In response to the sensor, a proportioning valve releases hydraulic fluid at increasing pressure to a desired maximum, to the hydraulic cylinder actuating the piston in the pumping chamber of a second pump operating in tandem with the first pump. The product is expelled alternatively from the two pumps at the maximum desired pressure appropriate for the character of the product. The pump also includes means for flushing the pump without dismantling.

Abstract: Method and apparatus for compressing gas. Two accumulators are alternately filled with gas from a gas-supplying conduit, and the gas is forced out of one end of the accumulators into a gas-receiving conduit by liquid forced into the other end of the accumulators. A reversible pump moves liquid from one accumulator to the other accumulator. The reversible pump is connected so that pump cavitation is prevented. The invention includes a switching system to switch liquid flow from one accumulator to the other accumulator. Liquid that leaks from the system may be resupplied using a liquid supply system that comprises a pressure container with a compressible element.

Abstract: A dual piston alternately reciprocating pumping apparatus utilizing, in part, a pressure based precompression stroke to provide product at a substantially uniform discharge pressure. In operation, a first feed piston is advanced through a first feed cylinder to discharge product therefrom, during which time a second feed piston is retracting within a second feed cylinder to obtain a product charge therein. The second feed piston reaches bottom dead center and thereafter advances through the second feed cylinder on a precompression stroke, during which no product is discharged from the second feed cylinder. After a predetermined pressure related to that within the second feed cylinder is detected, further advancement of the second feed piston is terminated and is not reactivated until the first feed piston nears top dead center. Therefore, a product having a substantially uniform discharge pressure is provided.

Abstract: An electro-hydraulic position-servo device to quickly and accurately position a stop element is provided for use with a positive displacement fuel injection system, wherein a shuttle is used to positively displace pre-metered slugs of fuel to unit injectors. The stop device is operatively associated with a control shaft having at least one helical surface thereon; the stop element and control shaft slidably located within a housing. The housing permits communication between at least one pressurized fluid source and a drain line by way of a chamber within which the control shaft is located. Thus, by simply rotating the control shaft from rotational drive means, the control shaft will assume an axial position determined by the orientation of the helical surface with respect to the supply and drain lines. The device is adjustable by rotation of the shaft to a new position with the re-orientation of the helical surface.

Abstract: The pump has several cylinders which are arranged in a row narrowly adjacent to one another and which accommodate the stroke working spaces of plungers or pistons. The stroke work of the pistons is hydraulically transmitted to diaphragms which close off pump working spaces inside of diaphragm working spaces in the direction of the cylinders. Because of the arrangement of the diaphragm working spaces or of the pump working spaces on different sides of the cylinder block, diaphragms or diaphragm working spaces may be arranged which have cross-sections that are large in comparison to the distance of the cylinders from one another.

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 coating material supply device capable of accurately supplying even a highly viscous coating material such as a two-component coating material by a constant amount to a coating machine with no trouble, as well as with no requirement of individually disposing flowmeters, e.g., for respective colors in the case of multicolor coating under color-change.

Abstract: A fluid pressure actuated motor assembly comprising a first fluid pressure actuated motor including a first reciprocating piston driven by a pressure differential across the first reciprocating piston, and a second fluid pressure actuated motor in communication with the first fluid pressure actuated motor and including a second reciprocating piston driven by the pressure differential across the first reciprocating piston.

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: A pump (10) is provided for pumping a fluid (14) from a borehole (12). The pump includes first and second pumping strings (20, 22) extending into the borehole and a return string (50) extending out of the borehole and to a storage tank (18). An upstroke cylinder (34) is slidably mounted for reciprocation on the first pumping string (20) and a downstroke cylinder (38) is slidably mounted for reciprocation on the second pumping string (22). A pump barrel (80) is slidably mounted to the return string (50) and forms a pumping chamber (86). Fluid from the borehole enters the pump chamber (86) through a one-way check valve (84) to equalize the fluid pressures between the pumping chamber and borehole. A pumping fluid is then entered into the first pumping string (20) to urge the upstroke cylinder (34) to the extended position, tensioning a cable (108) to move the pump barrel (80) and downstroke cylinder (38) to the retracted positions pumping the fluid in the pumping chamber up the return string (50).

Abstract: The disclosure is of a system for operating a turbine without production of steam by compressing a gas, supplying the gas to the turbine, and returning the reduced pressure gas to the compressing means.

Abstract: A dosing system for one or more fluent materials, such as the components of an epoxy resin, has a support carrying a lever to which are attached at different locations the piston rods of one or more independent master cylinders. Respective conduits connect these master cylinders to respective slave cylinders in turn connected to respective stroke-type dosing pumps. The intakes of those pumps are connected to respective supplies of fluent materials and the outputs are connected to a common mixing recipient. A power cylinder connected between the lever and the support can therefore operate the master cylinders jointly to synchronously operate the respective slave cylinders and pumps to deliver to the mixing recipient volumes of the respective materials that form a ratio corresponding to that of the distances between the attachment locations for the respective master-cylinder piston rods on the lever and the pivot.

Abstract: Apparatus for metering material and transferring it from one location is provided. The new metering apparatus has several advantages over that disclosed in my U.S. Pat. No. 4,118,799. The apparatus includes a pair of cylinders with rams which are reciprocated in opposite directions by gear racks connected thereto and driven by a common pinion. A plurality of pairs of the cylinders and rams can be mounted on a common frame or base to meter a number of different materials. Also, the rams, with or without the cylinders, can be readily replaced with components of different diameters to provide different metered quantities of materials. In addition, mechanism are provided for changing the stroke lengths of one or more pair of rams when two or more pairs are employed.

Abstract: A power generation system having a low pressure source of water, means connected to the source of water for pressurizing the water to a substantially higher pressure, means for forming steam from the pressurized water, and a steam turbine for deriving mechanical motion from the steam. The pressurizing means uses first and second chambers of variable volumes. Valve means are associated with the first and second chambers so that water flows into the first chamber when its volume is expanding but water is not allowed to flow into the first chamber when its volume is contracting. Likewise, the valve means are utilized so that water flows into the second chamber when its volume is expanding but water is not allowed to flow into the second chamber when its volume is contracting. Furthermore, valve means are associated with the first chamber to allow pressurized water to flow out of the first chamber when its volume is contracting.

Abstract: An apparatus for harnessing and extracting a portion of the power generated by the rise and fall of ocean tides. A tidal chamber is provided wherein the rise of the tide creates positive air pressure within the tidal chamber and the fall of the tide creates a partial vacuum within the tidal chamber. The pressure and partial vacuum are, through appropriate valving, used to drive a pair of reciprocating, fluid-coupled rod and float assemblies, the motions of which can be harnessed to operate an air compressor, crank shaft, flywheel or other suitable mechanical device.

Abstract: Hydrostatic energy is converted to kinetic energy preferably for generating electricity by driving a fluid actuated motor connected to an electrical generator. Pumps are arranged in parallel for driving the motor, and are in turn actuated by engines driven themselves by a liquid contained in a reservoir in which the engines are disposed. The liquid in the reservoir is transferred to and from and also between the engines for actuating same.

Abstract: A reciprocating device for proportionating volumes of two distinct and different fluids within the same housing by a simultaneous fluid drawing from a supply source into the separate compartments provided inside an elongated housing of differential diameters having separating seals incorporated therein and receiving slideably different diameter pistons of elongated close sliding fit, comprising separate chambers suitable for fluid separation and holding therein at the end of a first suction cycle and subsequently by a simultaneous fluid discharge from the separate chambers for mixing with resultant dilution thereof during a second exhaust cycle, to provide simple and accurate proportioning-diluter adaptable for use in applications handling highly concentrated chemicals in a solution form subject to a precise dilution in fixed measured displacements per each stroke, including various means of diluter operation from manual to automatic unit operation by the use of pressurized fluids such as pressurized air or e

Abstract: A blood pumping system has a pair of integral flexible bodies each provided with an inlet and an outlet and disposed in open top cavities in a housing. The cavities have extensions holding inlet valves and outlet valves for opening and closing the inlets and outlets. A flexible diaphragm overlies the cavities and their extensions and is secured by a cover providing separate chambers over the inlet valves, the outlet valves and the bodies. Solenoid air valves are selectively energized to supply and exhaust the chambers to operate the valves and bodies. Switches responsive to the full and empty positions of the bodies govern the energization of the solenoids through control circuitry including a voltage controlled oscillator, a device for changing the frequency of the oscillator in accordance with the time of operation of at least some of the switches, and a device for ensuring at least a minimum rate of operation of the switches.

Abstract: A hydropneumatic pumping arrangement comprising at least two double-acting hydropneumatic force multipliers, pneumatic chambers of pneumatic cylinders of the multipliers communicating, through two two-position directional valves with an air source, and the chambers communicating through hydraulic non-return valves, with hydraulic pressure and return lines connected to actuating hydraulic cylinders of the associated processing equipment. The valves are cylindrical slide valves, an inlet passage of one slide valve is in communication with an air source and outlet passages are in parallel communication with the pneumatic chambers and with control chambers of another slide valve, outlet passages thereof being in communication with the control chambers of the one slide valve of the other force multiplier for alternate communication of the pneumatic chambers of both multipliers with the air source in the course of travel of the pistons of the pneumatic cylinders thereof.