Abstract: The present invention provides a hydraulically driven multiphase pump system and methods for pumping a fluidstream from the surface of a well. The hydraulically driven multiphase pump system consists of two vertically disposed plungers. The plungers are hydraulically controlled and actuated to work in alternate directions during a cycle using a closed loop hydraulic system. Each cycle is automatically re-indexed to assure volumetric balance in the circuits. An indexing circuit ensures that each plunger reaches its full extended position prior to the other plunger reaching its preset retracted position. A power saving circuit is used to transfer energy from the extending plunger to the retracting plunger. A trim circuit is used to ensure a proper fluid level in the indexing circuit and the power saving circuit. Additionally, a rapid reversal circuit may be employed to increase the rate of the two vertically disposed plungers.

Abstract: A fluid-handling system capable, in various embodiments, of storing, mixing, and dispensing fluids, and also regulating the flow of fluids. The system includes a cartridge having a non-expandable housing, and a bladder within the housing. In some variations, a drive-liquid is introduced into a region between the housing and the bladder, which causes fluid contained within the bladder to dispense. In some other variations, the drive-liquid is introduced into the bladder, which causes the bladder to expand and expel fluid that is contained with the housing.

Abstract: A system for supplying a pre-determined ratio of liquid foam concentrate and water to a mixing device immediately upstream from a fire fighting nozzle. The system is electronically balanced by measuring pressure from a plurality of pressure signal sensors and transmitting said pressure signals to a controller unit. A foam additive pump is powered by a fixed displacement piston motor which in turn is electronically modulated independently of the level of operation of the water pump by a control system that is responsive both to the water pressure developed by the water pump and to the foam liquid concentrate pressure developed by the additive pump.

Abstract: The present invention relates to a pumping device for delivering and metering fluids, in particular medical fluids such as dialysis fluids, with a piston unit having a driving device and a piston and with a membrane unit which has a membrane and a first chamber bordered by the membrane. The pumping device also has a hydraulic unit which has a space to accommodate a hydraulic fluid which is connected to the piston of the piston unit and to the first chamber of the membrane unit. The reliability of metering by such a pumping device is increased by providing a control unit for guaranteeing a predefinable metering rate and/or quantity and also providing a measuring device by means of which the axial position of the piston unit can be determined directly and which can be connected to the control unit.

Abstract: A fluid-handling system capable, in various embodiments, of storing, mixing, and dispensing fluids, and also regulating the flow of fluids. The system includes a cartridge having a non-expandable housing, and a bladder within the housing. In some variations, a drive-liquid is introduced into a region between the housing and the bladder, which causes fluid contained within the bladder to dispense. In some other variations, the drive-liquid is introduced into the bladder, which causes the bladder to expand and expel fluid that is contained with the housing.

Abstract: A dispenser for dispensing at two flow rates eductively draws a chemical fluid such as a concentrated cleaning solution for diluting with a motive fluid such as water. Using eduction rather than gravity feed provides a consistent dilution ratio over a range of pressures of the motive fluid. A chemical reservoir contains the chemical fluid and a bottle insert assembly for interfacing to the dispenser. The bottle insert assembly seals an opening to the reservoir when the reservoir is not inserted in the dispenser, preventing leaks. Also, the bottle insert assembly includes dual pickup tubes, each with a purge accumulator, to allow dual rate flow at the same or different dilution ratios as well as drawing back unused chemical fluids from the dispenser to avoid carryover or contamination.

Abstract: A hydraulic system for a reciprocating piston pump that includes an accumulator for producing a steady-pressure supply of compressible material to a distribution nozzle. The hydraulic system includes an adjustable means for constricting the flow of hydraulic fluid from the accumulator to the hydraulic system. The means for constricting the flow of hydraulic fluid allows the operator to compensate for the type of material being pumped, the vertical distance the material is being pumped, as well as the overall distance the material is being pumped in order to reduce or eliminate line surge. The means for restricting the flow from the accumulator preferably includes a needle valve that allows the operator to select the flow characteristic from the accumulator.

Abstract: The present invention provides a hydraulically driven multiphase pump system and methods for pumping a fluidstream from the surface of a well. The hydraulically driven multiphase pump system consists of two vertically disposed plungers. The plungers are hydraulically controlled and actuated to work in alternate directions during a cycle using a closed loop hydraulic system. Each cycle is automatically re-indexed to assure volumetric balance in the circuits. An indexing circuit ensures that each plunger reaches its full extended position prior to the other plunger reaching its preset retracted position. A bias member and an acceleration valve are used to prime the indexing circuit for use in low or variable inlet pressure situations. A power saving circuit is used to transfer energy from the extending plunger to the retracting plunger.

Abstract: A pumping system. The pumping system has a cylinder pump, a first group of switching devices, and a second group of switching devices. The first group of switching devices enable the cylinder pump to pump the liquid by feeding the gas provided by the gas source into the cylinder pump through a first ventilator according to a first enabling signal, and the second group of switching devices enable the cylinder to output the liquid by feeding the gas provided by the gas source into the cylinder pump through a second ventilator according to a second enable signal.

Abstract: The present invention provides a hydraulically driven multiphase pump system and methods for pumping a fluidstream from the surface of a well. The hydraulically driven multiphase pump system consists of two vertically disposed plungers. The plungers are hydraulically controlled and actuated to work in alternate directions during a cycle using a closed loop hydraulic system. Each cycle is automatically re-indexed to assure volumetric balance in the circuits. An indexing circuit ensures that each plunger reaches its full extended position prior to the other plunger reaching its preset retracted position. A bias member and an acceleration valve are used to prime the indexing circuit for use in low or variable inlet pressure situations. A power saving circuit is used to transfer energy from the extending plunger to the retracting plunger.

Abstract: A fluid pumping system includes a number of stages. Each stage has a fluid chamber having a top end with an air aperture and a bottom end with a fluid apertures. An air line is connected to the air aperture, and a fluid input conduit, with an input check valve, is connected to the fluid aperture. A float valve is disposed in the chamber directly between the fluid aperture and the air aperture. A fluid output conduit is connected to the fluid aperture above the input check valve. The float has a bottom end adapted to seal with the fluid aperture when the chamber is empty. A first set of pumping stages are supplied by a first compressed air line and a second set of pumping stages are supplied by a second compressed air line. Periodically, compressed air is supplied to a first set of pump stages to drive fluid from each of the first set of pump stages to a second set of stages, and vice versa.

Abstract: A fluid pumping system includes a number of stages. Each stage has a fluid chamber having a top end with an air aperture and a bottom end with a fluid apertures. An air line is connected to the air aperture, and a fluid input conduit, with an input check valve, is connected to the fluid aperture. A float valve is disposed in the chamber directly between the fluid aperture and the air aperture. A fluid output conduit is connected to the fluid aperture above the input check valve. The float has a bottom end adapted to seal with the fluid aperture when the chamber is empty. A first set of pumping stages are supplied by a first compressed air line and a second set of pumping stages are supplied by a second compressed air line. Periodically, compressed air is supplied to a first set of pump stages to drive fluid from each of the first set of pump stages to a second set of stages, and vice versa.

Abstract: A liquid injection arrangement for inserting a foaming agent into water for a fire fighting application, or a similar use, requires that metered quantities of a liquid chemical foamant or other agent be injected into a conduit assembly conveying a water stream. A desired concentration of foamant requires varying the foamant flow as a function of water flow. A tank holds a quantity of liquid chemical foamant, and at least one pump has an inlet port coupled to the tank and an outlet port coupled to the conduit assembly. A hydraulic motor drives the pump and a valve is coupled with the hydraulic motor and a source of pressurized hydraulic fluid. A sensor is placed adjacent to the outlet port of the pump to feed back a signal representing the pressure of the water flowing through the conduit assembly, and a control system is responsive to the signal and to a flow rate of water flowing through the conduit assembly, producing a signal for controlling a speed at which the hydraulic motor drives the foamant pump.

Abstract: A fluid pumping system includes a number of stages. Each stage has a fluid chamber having a top end with an air aperture and a bottom end with a fluid apertures. An air line is connected to the air aperture, and a fluid input conduit, with an input check valve) is connected to the fluid aperture. A float valve is disposed in the chamber directly between the fluid aperture and the air aperture. A fluid output conduit is connected to the fluid aperture above the input check valve. The float has a bottom end adapted to seal with the fluid aperture when the chamber is empty. A first set of pumping stages are supplied by a first compressed air line and a second set of pumping stages are supplied by a second compressed air line. Periodically, compressed air is supplied to a first set of pump stages to drive fluid from each of the first set of pump stages to a second set of stages, and vice versa.

Abstract: A pneumatic pump control system for sequentially switching on and off an electrically operated pump disposed in a waste water liquid storage tank The pneumatic pump control system comprises a pneumatic pressure accumulator that is disposed within the liquid storage tank at a predetermined level. The pneumatic pressure accumulator is a dome-type that defines an interior air chamber for containing air, and a lower opening disposed at an elevation that represents a zero reference level within the tank. The lower opening is in communication with the liquids in the liquid storage tank when the level of liquid is as high as the lower opening. A pressure transducer is operatively connected to the pneumatic pressure accumulator for communication with the interior air chamber to measure the differential air pressure between the air within the interior air chamber and the upper layer of air within the liquid storage tank.

Abstract: A method of detecting an air pocket in a concrete pump and minimizing the effect of the nozzle and boom reaction as the air pocket reaches the end of the boom. The hydraulic pressure of the pump is monitored to determine when a pump stroke contains air. Upon detection of air in a pump stroke, an alarm is sounded and the pump is slowed to minimize the effect of the air pocket when it reaches the nozzle of the boom.

Abstract: A gear pump and reservoir device for a fluid sprayer comprises a pump housing having a recessed portion for receiving and sealing thereto a fluid reservoir and a cavity for locating a drive motor and gears therein. The recessed portion has a rigid conical projection centered therein which has an orifice extending into a pump inlet. The gear pump further includes a fluid container mounted above the recessed portion of the pump housing to form a fluid reservoir. The fluid reservoir has a discharge valve that is opened by engagement with the conical projection within the recessed portion to provide fluid communication to the pump inlet. A static head in the fluid reservoir maintains the gear pump in a primed state. A fluid line leading from the gear pump to a sprayer head has a discharge check valve located therein.

Abstract: A controller for controlling operating parameters associated with fluid flow, speed or pressure for a centrifugal pump for pumping fluid, wherein at least one sensor is coupled to the pump for generating a signal indicative of a sensed operating condition. The controller comprises a storage device for storing data indicative of at least one operating condition and a processor in communication with the sensor and operative to perform an algorithm utilizing the at least one sensor signal and the stored data indicative of the at least one operating condition to generate a control signal, wherein the control signal is indicative of a correction factor to be applied to the pump.

Abstract: A hydraulic pump assembly (10) for powering a hydraulic torque wrench (24) is air-powered and has hydro-pneumatic control circuitry (39) which continues operation of an air motor (18) which drives the hydraulic pump (16) for a post-advance period after an advance actuator (55) is deactuated. Operation of the pump (16) is continued for a period sufficient to retract a double-acting torque wrench (24), to permit subsequent advances of the wrench (24) within the post-advance period without restarting the pump (16) or to permit a single acting wrench to be moved from one fastener to the next within the post-advance period without restarting the pump (16). Operation of the pump (16) is terminated when the post-advance period expires if the advance actuator (55) is not reactuated, so as to conserve energy and avoid unnecessary heating of the hydraulic fluid.

Abstract: The present invention is a means and method for providing constant output flow from a fluid pump. The invention does this by controlling the radial speed of the pump motor during discreet segments of the motor's 360° angular/radial path through a revolution of the pump. The electric pump motor is controlled throughout the 360° radial path by employing a control means for controlling the speed of actuation of the radial steps of a stepper motor throughout the 360° path of rotation of the stepper motor. Control means for controlling the speed of the discreet steps of the stepper motor comprises at least a memory means, a counting means and an amplification means.

Abstract: The present invention relates to a pump of resin deposition on a semiconductive wafer including a pump body divided by a membrane of definition of a resin dispensation chamber and of a control chamber and an element of filtration of the resin before its dispensation to an outlet access of the pump body. The pump includes a control system for injecting the resin under constant pressure into the control chamber and aspiring the resin from the control chamber, and a capacitive presence sensor for detecting a first position of the membrane.

Abstract: An automatic shut-down system for wet/dry glycol pump thereby providing a pump protection system located in the fluid circuit between the reboiler and glycol contactor elements of a gas dehydration system. The system includes a filter or filter system, if one is not already provided within the existing dehydration system, a vertical tank having an external gas operated float valve with controls for remotely pilot operating a cut-off valve located in the wet glycol line between the contactor and the glycol pump. Therefore, in operation, when the dry glycol level in the vertical tanks drops below a set level, the float valve blocks gas pressure applied to the cut-off valve maintaining it in the open condition, thus allowing it to close and thereby blocking the flow of wet glycol to the pump, thus effectively shutting down the pump and the system. Once the imbalance is corrected, the system automatically resumes operation.

Abstract: A gear pump and reservoir device for a fluid sprayer comprises a pump housing having a recessed portion for receiving and sealing thereto a fluid reservoir and a cavity for locating a drive motor and gears therein. The recessed portion has a rigid conical projection centered therein which has an orifice extending into a pump inlet. The gear pump further includes a fluid container mounted above the recessed portion of the pump housing to form a fluid reservoir. The fluid reservoir has a discharge valve that is opened by engagement with the conical projection within the recessed portion to provide fluid communication to the pump inlet. A static head in the fluid reservoir maintains the gear pump in a primed state. A fluid line leading from the gear pump to a sprayer head has a discharge check valve located therein.

Abstract: An air flow sensor and method for filling a filter press which detects slowing and/or intermittent stoppage of the feed pump and signals a controller associated with a pressure regulator to increase the pressure of the air supplied to the feed pump. The air flow sensor includes a spring-biased piston slidably movable within a housing, which piston defines a flow passage therein and carries a magnet thereon. A switching device is mounted on the housing and detects the position of the piston magnet, and when the piston approaches the closed position, the switching device transmits a signal to step-up the air pressure to the feed pump.

Abstract: The invention relates to an apparatus for use in a liquid circulation system of the kind comprising a primary circulatory circuit provided with a circulation pump and having a primary forward flow and a primary return flow, as well as a secondary circulatory circuit with a secondary forward flow and a secondary return flow, said primary and secondary forward and return flow being connected to the apparatus, and the liquid circulating in the primary and secondary circulatory circuits being of substantially the same composition. The apparatus comprises two positively interconnected displacement machines (A, B), of which one (A) receives the primary forward flow (P.F.) and delivers the secondary forward flow (S.F.), whilst the other (B) receives the secondary return flow (S.R.) and delivers the primary return flow (P.R.

Abstract: A diaphragm pump is provided with a diaphragm defining a pump chamber and a drive chamber in the pump housing, a driving fluid is supplied to the drive chamber and a pump fluid is expelled from the pump chamber. The diaphragm pump is provided with pressure control means which, when the pressure in the pump chamber surpasses the pressure in the drive chamber neighboring the pump chamber across the diaphragm, controls the pressure of the driving fluid based upon output signals from pressure sensors in such a manner that the pressure in the fluid chamber will become higher than the pressure in the neighboring drive chamber. This makes it possible to prevent a diaphragm reversal phenomenon, wherein a diaphragm that should expand toward the pump chamber contracts toward the drive chamber instead during reciprocation of the diaphragm.

Abstract: A dynamic displacement sensor for detecting an out-of-fluid condition in a liquid delivery system detects an increased amplitude of pump motion of a reciprocating air pump and provides an output signal upon detecting the increased amplitude motion. The detector includes a spring-mass combination supported within a housing such that the mass is movable along a defined axis of the housing, with the spring applying a restoring force to the mass when the mass moves away from its static position. The detector is attached to the pump with its defined axis aligned parallel with the pump axis. A sensor within the housing is triggered to change state when the mass is displaced by pump motion of a predetermined amplitude and frequency, thereby providing is an output signal indicating an out-of-fluid condition.

Abstract: A pneumatic pump is provided including a housing with an inlet aperture and an outlet aperture. A one way valve is mounted on the inlet aperture. A tube has a first end connected to outlet aperture and a second end positioned distant the housing. An air compressor resides in communication with the housing via a conduit. The air compressor serves to continuously elevate the pressure of air within the conduit. A solenoid valve allows the flow of the pressurized air to the housing only upon the actuation thereof. When the solenoid is actuated, the pressure within the interior of the housing is elevated above that of the exterior such that the valve is closed and the water within the housing is excreted through the outlet pipe. Finally, a timer is connected to the solenoid valve to actuate the same at user selected time intervals.

Abstract: The invention provides an apparatus for optimizing performance of a fluid pump having a supply port and a pressurized output port, comprising: a pressurized supply of a first fluid; a variable regulator coupled to the supply having a variable pressure output; and a second pump driven by the variable pressure output for impelling a second fluid into the supply port of the fluid pump.

Abstract: A precision high-pressure control assembly for supercritical fluids comprises a continuous flow system having a pressure control loop which includes a source of fluid communicating with a piston driven pump. A pressure sensor monitors the pressure of the supercritical fluid in the outlet line of the pump. A pressure controller has an input for receiving a signal relating to the pressure sent by the pressure sensor and the pressure controller yields an electronic output signal to an electropneumatic regulator. A source of air communicates with the electropneumatic regulator to provide pressurized regulated driver air directed to the pump. The electropneumatic regulator controls the regulated driver air pressure of the pump in accordance with the signal received from the pressure controller. The piston head of the pump is in a cryogenic chamber to minimize flash and cavitation.

Abstract: A method is provided for controlling fuel flow to the combustor of a gas generator turbine during sudden changes in load or during a surge cycle of the process turbocompressor. Surge control is initiated by analog input signals emanating from various devices located throughout the compressor-process system. The fuel control system includes input signals from the gas turbine driver. These signals are acted upon by the fuel control system which transmits a signal to a fuel valve actuator that controls the valve that meters fuel to the combustor. In addition to this sequence of control communication, however, is a rate-of-change in the amount of the fuel provided. The rate of the increase of the amount of fuel is determined by current operating functions of the fuel control system. However, because of the characteristics of general load rejection and recovery, and the abrupt nature of surge, the rate of change in the flow rate of fuel is extremely high.

Abstract: A liquid transfer system for liquids that are subject to solidification uses a pipeline, with compressed gas as the liquid displacement medium. The pipeline comprises a substantially rigid outer line and a flexible inner hose, forming with the outer line an intermediate interstitial zone along the inner hose; a check valve located adjacent each end of the inner hose provides uni-directional flow within the system. A gas compressor connected with the interstitial zone by way of a flow control selectively applies pressurized gas or vacuum to the zone. The three possible phases of operation comprise; a first phase, when vacuum is applied to the interstitial zone, to expand the inner hose and induce liquid from the source to substantially fill the inner hose; a second phase when gas pressure is applied to the interstitial zone, to compress the inner hose and expel the liquid toward the point of delivery. The first and second phases are repeatable, to provide cumulative delivery of the liquid.

Abstract: A control system for controlling the stroke length of an axially reciprocating shaft in a double-diaphragm pump between a leftmost shaft position and a rightmost shaft position. In one embodiment, the control system includes a marker on the shaft of the pump. A sensor is positioned adjacent to the shaft and located along the longitudinal axis of the shaft with respect to the marker to sense a change in the position of the marker when the shaft is at the leftmost and rightmost positions. The sensor sends signals to a controller that in turn sends a response signal to a driver. The drive alternates directing pressurized air to a first air cell and a second air cell to selectively reciprocate the shaft in a desired direction between the leftmost and rightmost shaft positions.

Abstract: A precision high-pressure control assembly for supercritical fluids comprises a continuous flow system having a pressure control loop which includes a source of fluid communicating with a pump. A pressure sensor monitors the pressure of the supercritical fluid in the outlet line of the pump. A pressure controller has an input for receiving a signal relating to the pressure sent by the pressure sensor and the pressure controller yields an electronic output signal to an electropneumatic regulator. A source of air communicates with the electropneumatic regulator to provide pressurized regulated driver air directed to the pump. The electropneumatic regulator controls the regulated driver air pressure of the pump in accordance with the signal received from the pressure controller.

Abstract: A pump apparatus for use in a pump system of a well capable of exerting and releasing pressure on a pump fluid supplied to the pump apparatus. The pump apparatus includes a tubular body having a pump fluid space for communicating with the pump fluid and a chamber for receiving unpumped well fluid and for furnishing pumped well fluid to a wellhead of the well, wherein the pump fluid and the pumped well fluid remain separated. The pump apparatus includes a device located inside the tubular body and in contact with the pump fluid space for displacing the pumped well fluid from the chamber to the wellhead in response to the pump system exerting pressure on the pump fluid and for receiving the unpumped well fluid from a producing formation and delivering the unpumped well fluid to the chamber in response to the pump system releasing pressure on the pump fluid.

Abstract: A hydraulic pump assembly for powering a hydraulic torque wrench is air-powered and has hydro-pneumatic control circuitry which continues operation of an air motor which drives the hydraulic pump for a post-advance period after an advance actuator is deactuated. Operation of the pump is continued for a period sufficient to retract a double-acting torque wrench, to permit subsequent advances of the wrench within the post-advance period without restarting the pump or to permit a single acting wrench to be moved from one fastener to the next within the post-advance period without restarting the pump. Operation of the pump is terminated when the post-advance period expires if the advance actuator is not reactuated, so as to conserve energy and avoid unnecessary heating of the hydraulic fluid.

Abstract: A reversible flow variable rate hydraulic swashplate pump furnishes hydraulic fluid to stroke a piston supporting a subsurface pump. The controller determines reversal of pump flow and timing and speed of upstroke and downstroke of the subsurface pump. No valving restricts hydraulic fluid flow, and energy from the falling mass of the beam and sucker rods is accumulated during downstroke to be utilized during upstroke. The invention also includes the method steps of pumping hydraulic fluid to a cylinder containing a piston supporting the subsurface pump piston at a constant increasing rate until a maximum preset flow is reached, decreasing the flow to zero at a rate different than the increasing rate, reversing the hydraulic fluid flow to flow from the cylinder to the hydraulic pump at a constant increasing rate until maximum preset reverse flow is reached, and reducing reversed flow to zero at a rate different than the increasing flow rate.

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: First and second boosters 1, 2 which, through reciprocating motions of oil hydraulic cylinders 6a, 6b, pressurize water sucked into plunger chambers 3a, 3b to a superhigh pressure level are connected in parallel to a water discharge line 8, First and second three-position directional control valves 9, 10 are arranged between the oil hydraulic cylinder of each booster and a hydraulic pump 11, 12 so as to cause the hydraulic cylinder to perform a reciprocal movement. The first and second boosters 1, 2 are provided respectively with first and second sets of forward stroke and return stroke sensors (29, 29'; 30, 30') for detecting positions adjacent to respective ends of pressing and suction strokes.

Abstract: An apparatus comprising a pair of fluid driven pump assemblies in a back-to-back configuration to yield a bi-directional pump. Each of the pump assemblies includes a piston or diaphragm which divides a chamber therein to define a power section and a pumping section. An intake-exhaust valve is connected to each of the power sections of the pump chambers, and function to direct fluid, such as compressed air, into the power section and exhaust fluid therefrom. At least one of the pistons or diaphragms is connected by a rod assembly which is constructed to define a signal valve, whereby the intake-exhaust valve of one pump assembly is controlled by the position or location of the piston or diaphragm in the other pump assembly through the operation of the rod assembly signal valve. Each of the pumping sections of the pump assemblies are provided with intake and exhaust valves to enable filling of the pumping section with fluid and discharging fluid therefrom when a desired pressure has been reached.

Abstract: Provision is made for an air control valve to bypass the ice forming exhaust of a reciprocating pressure activation chamber in a reciprocating double diaphragm pump utilizing the supply pressure to close a check valve in line between the valve and the chamber which is then opened to exhaust by exhaust fluid flow from the chamber.

Abstract: A pilot spool is interposed between the compressed air supply and the diaphragm pump-operating main spool, to insure that, at any one time, only one end of the bore in which the main spool reciprocates receives the compressed air. The pilot spool has an annular recess of a length which does not bridge across passageways which admit the air to the main spool, so alternatively, each passageway opens onto an end of the main spool bore. The reciprocating pump structure, that is, the double diaphragms, shaft, and clamp plates, cause the pilot spool to shift, to communicate one of the passageways, with each shift, with the air supply and the main spool bore. No lubrication is provided or needed, and the pilot spool insures that the main spool will not stall.

Abstract: A pneumatic assist valve receives constant air pressure from supply air to provide the pneumatic assist to shift the pilot, eliminating false signals acting on the trip rod and the design also assures the pilot has completely shifted before diaphragm reversal occurs.

Abstract: An apparatus for drawing off dust-laden gases, especially in the art of dental technique, has a ring channel (15) which can be loaded with compressed air. The airstream which is provided by a compressed-air nozzle (26) performs an arcuate movement in the ring channel (15), whereby dust-laden gases are drawn in through an annular slit (22) and conveyed to an outlet channel (13). The apparatus is suitable for drawing off gases from containers. The apparatus serves for drawing off dust-laden air which is released when mixing solid substances, for example dental investment material, in a container (10).

Abstract: In a hydraulic control device for a viscous fluid pump with at least one feed cylinder (11) drivable by a hydraulic cylinder (12), the feed chamber (17) of which can be alternately connected via a hydraulically operable inlet valve (18) a hydraulically operable outlet valve (21) to a reservoir (19) and a feed line (22), whereby in the loading phase of the feed cylinder (11) the inlet valve (18) is open and the outlet valve (21) closed and in the feed phase of the feed cylinder, in which its piston is driven so as to reduce the volume in the feed chamber (17), the outlet valve is open and the inlet valve is closed, and with a hydraulic sequence control actuating the correct cyclic changeover between the inlet and outlet valves and the changeover of the pump drive, a valve forming part of the changeover control device of the sequence control and relieving the pressure in the feed chamber of the control cylinder (53) designed to actuate the outlet valve (21) takes the form of an electrically or hydraulically act

Abstract: An improved sampling pump has utility for withdrawing fluid from a pressurized source and outputting fluid to a sampling container. The fluid pump assembly of the present invention includes an operator unit for reciprocating a plunger, and a side body port positioned within the pump body for receiving a removable filter. A pressure regulator has an inlet positioned within a side body port of the pump body and regulator outlet port in fluid communication with the operator unit. A collar rotatable with respect to a regulator housing is provided for reducing installation costs and for optionally removing condensate from the regulator. An adjustable discharge valve is pressure balanced for increasing the reliability of the pump. An improved seal is utilized for dynamic seal engagement between the pump body and the pump plunger.

Abstract: A fire fighting system introduces a liquid chemical foam concentrate into a water stream. The system may incorporate either or both of a hydraulic motor driven pump under control of a microprocessor-based hydraulic valve driver and an electric motor driven pump under control of a DC motor drive circuit. The DC motor drive circuit is adapted to be connected in electrical communication with the hydraulic valve driver and with a display/controller also incorporating a microprocessor. When operating in the dual mode, when the quantity of chemical foamant that must be added to the water stream to maintain a desired percentage mixture exceeds the capacity of the electric motor driven foam pump, control is transferred, via the hydraulic valve driver, to allow a hydraulic motor to drive a separate foam pump.

Abstract: A fluid pumping system comprises a reciprocable pump having a reciprocable member. A valving system controls the supply of fluid under pressure to the reciprocable member to bring about reciprocation of the member. In order to provide a much more compact unit, the valving system is arranged to be offset radially from the reciprocable member, yet is drivingly connected to the reciprocable member through a unique mechanism so that the valving system may switch states responsive to the stroke travel of the reciprocable member.

Abstract: An aftercooler through which a first fluid passes. A cooling fan applies a cooling fluid to the aftercooler. A variable speed motor is rotatably coupled to the cooling fan. A temperature sensor, in communication with the first fluid, is located downstream of the aftercooler. A controller controls operation of the variable speed motor based upon the temperature applied to the temperature sensor to prevent condensate freeze-up.

Abstract: A well pumping system includes a pivotally mounted walking beam and "horsehead" connected to a downhole pump by a pump rod in the conventional manner. A hydraulic lift piston and cylinder and a pneumatic balance piston and cylinder are connected to the walking beam. A process control computer controls input signals to a hydraulic control valve for controlling the hydraulic cylinder rate and direction of travel to provide corresponding control over the motion of the walking beam. The computer receives input information from a position sensor indicating the displacement of the beam in its range of travel. The computer program also is responsive to a timer for determining actual stroke rate and acceleration of the beam. The computer monitors and controls operation of the hydraulics and pneumatics as the pumping unit produces the lift necessary to extract fluid from the well.