Abstract: A piston-type infusion pump is provided having an improved method of occlusion detection. The infusion pump includes processing circuitry for controlling the drive mechanism to infuse medication to a patient, including a sensor to track the position of the syringe plunger, thereby metering the amount of medication dispensed to the patient. The processing circuitry also includes a force sensor for providing signals indicative of the presence of occlusions along the infusion path. The operation of the drive mechanism causes delivery of medication to the patient. The infusion pump is constructed to be watertight.

Abstract: A novel method for counting pump cycles of an air pump by detecting the air pressure differential of the air pump cycle with a differential pressure switch and attaching an electronic counter to the pressure switch to count the number of openings and /or closings detected by the pressure switch.

Abstract: A level control device is adapted for use in a wastewater pump station. The level control device cooperates with a discharge pump to control the volume of wastewater contained in the pump station. The level control device includes a buoyant housing for being located in the pump station, and capable of floating on a surface of the wastewater. A control switch is adapted for being operatively connected to the motor starter of the discharge pump to activate the pump when the housing reaches a predetermined elevation in the pump station due to an increasing level of wastewater. An anti-accumulation surface of the housing acts to resist accumulation of grease and other waste.

Abstract: A compressor includes a front housing, a cylinder block, a cylinder head, and a torque transmission mechanism. The torque transmission mechanism includes a pulley, a plate-shaped elastic member connected to the pulley, a hub connected to the plate-shaped elastic member, a drive shaft connected to the hub, and a rotor connected to the drive shaft. The compressor also includes a reciprocating mechanism connected to the torque transmission mechanism. The compressor further includes torque determination means. The torque determination means includes a first marker affixed to the pulley and a second marker affixed to the hub. The torque determination means also includes a first sensor affixed to the front housing which generates a first timing signal when the first marker is positioned within substantially the same vertical plane as the first sensor.

Abstract: In a turbo-molecular pump, a rotor is supported by a magnetic bearing (3) in a non-contact mode. A pump control section (2) has a magnetic bearing control device (8) with a digital signal operating processor or DSP (7) which is programmable by a software or which can execute a programmed software. The digital signal operating processor (7) performs the control of a heating system, namely, a heater, as well as the control of the magnetic bearing (3).

Abstract: A clamp assembly for a jet pump sensing line adjacent a jet pump within a nuclear reactor pressure vessel. The jet pump sensing line includes a support block. The clamp assembly includes a clamp body, a clamp member coupled to the clamp body, and a slide member coupled to the clamp body. The clamp assembly further includes a clamp bolt, a swing arm bolt, and a swing arm coupled to the slide member. The swing arm and the slide member are sized to receive and secure the sensing line and the clamp member. The clamp member and the clamp body are sized to secure the clamp assembly to the jet pump.

Abstract: A jet pump beam bolt locking assembly includes a locking sleeve having a plurality of ratchet teeth extending around the periphery of a base portion, and a lock plate having a beam bolt opening, and an integral beam spring arm having a plurality of ratchet teeth extending from at least a portion of a side of the spring arm. The spring arm ratchet teeth are sized to mesh with the locking sleeve ratchet teeth. The lock plate also includes a lip extending at least partially around the beam bolt opening which captures the locking sleeve. The spring arm is movable between a first position where a lock plate detent is positioned in a spring arm notch which permits engagement of the ratchet teeth, and a second position where the side of the spring arm is in contact with the detent which disengages the ratchet teeth to permit loosening of the beam bolt.

Abstract: An improved fluid detection mechanism for a canned motor pump includes a return passage which receives a fluid detector. The fluid detector is a bubble detector which can sense the presence of bubbles, or the lack of a fluid. The detector is preferably positioned in a return path for returning a cooling and lubricating pump fluid back to the pump chambers from the canned motor chamber. This location will likely be the hottest location and the lowest pressure location in the pump. This location provides a very good indication of when the motor is overheated. Also, the location provides a very good indication to identify the lack of adequate lubricating and cooling fluid being directed to the bearings. As such, the location provides benefits over the prior art.

Abstract: A duel function air pump has a compressor with an inlet connected to a first port, a first outlet connected to a second port. The air to the compressor is directed by a first tube from the first port, such that a suction effect exists at the first port. The air pumped out of the compressor is directed to the second port by a second tube, such that an exhaust or blowing effect exists at the second port.

Abstract: A pump for ultra-pure fluids comprises a flexible diaphragm separating a fluid chamber from an air chamber. The diaphragm creates an airtight seal between the fluid chamber and the air chamber when a self-centering and trapezoidal shaped wedge compressively forces the diaphragm into a trapezoidal shaped perimeter cavity surrounding the chambers. Any leak from the fluid chamber into the air chamber is detected by a fiber optic system comprising two optical fibers that are disposed at an angle that is calculated to enable light to pass between the fibers only in the presence of a liquid having a predetermined index of refraction. The fiber optic system can also be used to determine the stroke of the pump by disposing the fiber optic lines at an angle calculated to reflect light off of the oscillating diaphragm when the diaphragm arrives at a predetermined location.

Abstract: A control for a beverage dispenser monitors operation thereof to sense a beverage sold out condition. The control senses the voltage demand of a pump motor as it pumps the beverage from a source thereof to a dispensing valve. If the sensed voltage is high, that indicates the pump is encountering resistance and fluid is present. Conversely, if the sensed voltage use is low, that is taken to indicate that the pump is not pumping any liquid and that the container is empty. A software routine is used to sense the average current requirements during dispensing and adjust the reference voltage for the normal full reservoir pump current value based on a historical average thereof as indicated by a predetermined number of prior dispense cycles. The control uses the adjusted reference voltage as a base for determining a sold out condition.

Abstract: A fluid dispense system having a computer control system that operatively controls a stepper motor driving a nutating pump. The stepper motor actuates the nutating pump piston through partial revolutions. The computer control system determines the number of stepper motor steps required to pump a desired amount of fluid by the nutating pump by rotating the piston through segments which are less than a full revolution.

Abstract: Apparatus for and method of monitoring the condition of an air compressor. The apparatus includes a plurality of appropriately located sensors for sensing operating parameters of the air compressor and for outputting signals indicative of the condition of each of the operating parameters. An information processor is connected to receive the output signals from the sensors and to communicate output control signals in response thereto. The control signals contain information that allows appropriate control and maintenance of the air compressor.

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 sump pump has a float operated alarm switch mounted on the top end of the pump housing for activating an alarm when water rises above a normal operating level. The alarm is in a remote enclosure with the pump power plug so that plugging in the unit automatically positions the alarm in a desirable location to be heard. The power cord and alarm switch wire extend through a flexible corrugated tube that is attached to the pump housing and the alarm enclosure by strain relief connections that do not compressively crush the tube.

Abstract: A secondary air fan for an internal combustion engine includes a housing in which a motor unit drives a pump unit, the housing having an air inlet channel and an air outlet channel, an air mass sensor, being arranged in one of the channels to control the motor unit by an electronic unit. The air mass sensor is connected to the electronic unit which is attached to the housing and/or to the air inlet channel or to the air outlet channel.

Abstract: An integrated pump and meter having a spindle axially extending in the direction of the flow of fluid for pumping and metering the flow of fluid. A volume of fluid pumped is calculated as a function of spindle rotation. In one particular of embodiment, a pair of pressure sensors are located at the inlet and outlet of the pump/meter, respectively for computing a gap loss volume due to fluid passing between the pump/meter spindle and the cylinder wall. The gap loss volume and calculated flow volume are combined to calculate a total volume of fluid to be dispensed.

Abstract: A vacuum apparatus has a recessed portion which is provided at an appropriate position of a fan casing. When incoming materials frequently pass through the fan casing, the recessed portion wears more quickly than the rest of the inner surface of the fan casing. Hence, a user of the vacuum apparatus can easily know when to replace the fan casing by visually checking the recessed portion from outside the fan casing.

Abstract: A sealed, electrically controlled compressor provides for two way optical data transmission to and from its sealed interior. An optical window, securely sealed through the compressor shell, and a pair of optical devices located to either side of the window, allow data transfer with no separate lines piercing the shell.

Abstract: A device for monitoring the integrity of a diaphragm (1) of a diaphragm transport+ unit, made of one or a plurality of layers, having a resistance device (3) connected to one layer and having a measuring device interconnected to a current source (15) via a connecting arm (20), the measuring device being a Wheatstone bridge (2) in which the resistance device (3) forms a bridge resistance (S1, S2, S3, S4) in at least one bridge arm, and an incipient rupture of a layer of the diaphragm having the effect of altering the galvanometer arm voltage (B-D).

Abstract: A pressure adjusting device has a pumping device, a connector device, and a connection pipe connected to the pumping device and the connector device. The pumping device has a hollow cylinder, a plunger device inserted through the hollow cylinder, a cover covering the hollow cylinder, a check valve and a non-return valve inserted in the cover, and an inhale joint and an exhale joint connected to the cover. The connector device has a stepped post, a threaded rod inserted through the stepped post, a handle bar disposed on the stepped post, and a button disposed on the handle bar and receiving the threaded rod. The threaded rod has a head portion inserted in the connection pipe.

Abstract: A method and system for determining change in a fluid's flow rate within a line. The pressure variation in a second fluid, separated from the first by a pumping membrane, is measured in response to energy applied in a time-varying manner to the second fluid. From the response of the second fluid to the applied energy, changes in the flow rate of the first fluid are determined.

Abstract: The present invention relates to a high-pressure discharging pipe of a reciprocating motion compressor as a discharging way of compressed coolant from the compressor, which particularly improves a structure of the exhausting spring for the high-pressure discharging pipe for reducing vibration of the high-pressure discharging pipe, an vibrating noise of the compressor simultaneously and improving a confidence by progressing the exhaust in the high-pressure pipe with avoiding peculiar frequency generated from a predetermined revolution times of the compressor.

Abstract: A method for measuring the pumping operating parameters of a diaphragm delivery unit, the conductivity of a resistance device mounted on a diaphragm being measured, at least over one pumping period, as a time-dependent quantity, and this quantity being used in the measurement.

Abstract: A chemical injection pump for injecting chemicals into subsea system at depths up to 10,000 feet is described which uses a minimum of moving parts by employing an actuator, for instance a solenoid, to power a double acting actuator rod and plungers thereon. The pump would generate low pressures and low fluid volumes, but be more durable and reliable than conventional rotating pumps operating under subsea conditions.

Abstract: A floor air pump comprises an outer tube, a pressure leaking device, a pressure gauge, and an air discharge tube. The outer tube is provided with two cylinders different in size from each other. The pressure leaking device is disposed in the lower end of the outer tube and is provided in the interior thereof with a receiving compartment in communication with the large cylinder. The receiving compartment is provided with a pressure leaking slide block, and at least two leakproof rings to keep the inner wall of the receiving compartment in the airtight state. The pressure leaking slide block is provided with an annular groove for forming a channel along with the pressure leaking slide block. The receiving compartment is provided therein with a spring to provide the pressure leaking slide block with a recovery force. The pressure gauge is disposed in the outer side of the outer tube such that the pressure gauge is in communication with the interior of the outer tube.

Abstract: The present invention provides a compressor comprising a housing including a main housing body having an interior reservoir for receiving an oil supply and an upright cover fixedly attached to the main body. The cover has an oil discharge opening extending through a lower portion thereof. The lowest surface defines the oil discharge opening being disposed at substantially the same level as a bottom surface defining the reservoir. The highest surface defines the oil discharge opening being above the normal static free surface level of the oil within the reservoir. A removable plug in the oil discharge opening which when removed allows oil in the reservoir to flow outwardly of the oil discharge opening. The cover has an upwardly facing oil flow engaging and configuring surface extending from the opening for defining the discharge flow configuration of oil flowing out of the opening when the plug is removed.

Abstract: A device and method for detecting bearing overheating in oil-lubricated turbine pumps comprising and temperature transmitting collar and infrared sensor. The temperature transmitting collar is mounted on the pump line shaft immediately adjacent to the stretch bearing, which is the top bearing in the pump system. The infrared sensor is positioned within sensing distance of the temperature transmitting collar and control circuitry is provided to warn of abnormal temperatures and to turn the pump off if temperatures continue to rise to an alarm condition.

Abstract: This present application discloses an improved valve configuration such that an indicator port is incorporated directly within the valve allowing a sensing device to be mounted directly to the valve or within the valve body, this application being directed to both suction and discharge valves which sense at least one condition within a compressor comprising a cylinder, a piston, at least one discharge valve, and at least one suction valve, the valve further including a valve guard, a valve seat, a hollow area adapted and configured for housing a sensing device and a sensing device disposed within the hollow area.

Abstract: A method and system are disclosed for detecting the presence of a gas in a pump chamber of a pumping system. The methods, and systems employing the methods, involve isolating a pump chamber from its surroundings, for example by closing an inlet and outlet valve on lines to and from the chamber, and determining the volume of the pump chamber with a force applied to a moveable or flexible surface of the pump chamber. The volume of the pump chamber is then redetermined in a similar fashion but with a second, different level of force applied to the surface of the pump chamber. The volumes thus determined can then be compared to detect the presence of a gas in the pump chamber.

Abstract: A compressor protection and control subsystem for a rotary compressor provides temperature pressure, mis-wiring and vibrational protection for the scroll machine. The vibrational protection comprises a vibration sensor which is integrated on the circuit board of the protection and control subsystem. The vibration sensor, in conjunction with at least one timer, monitors the vibrations of the scroll machine and will shut down the machine when excess vibrations are sensed over a prespecified period of time. The temperature system monitors operating temperature conditions the pressure system monitors operating pressures and the mis-wiring system monitors the power supplied to the compressor. Once an undesirable characteristic is identified, the operation of the scroll machine is stopped. These protection systems are integrated into a single subsystem which identifies the reason of shutting off the scroll machine in order to simplify repairs needed.

Abstract: A tube in a pumped fluid system can become obstructed by a clog. The clog is automatically cleared in response to an obstruction signal by modifying the pumping cycle which is normally used to pump the fluid. In particular, the pumping cycle is stopped after a compression stroke to apply sustained high pressure in the clogged tube, using the same fluid and the same pump, to expel the clog from the tube. The obstruction signal is derived by measuring pressure during a portion of the pumping cycle when elevated pressure due to viscosity effects have subsided. Therefore, if the pressure remains elevated, a determination of an obstructed state can reliably be made which may be caused by a clog.

Abstract: A diaphragm pump having an active feedback system is provided. The diaphragm pump includes a diaphragm pump having a housing including a pumping cavity. The pump cavity having at least one diaphragm dividing the pumping cavity into a first pumping chamber and a first pump actuating chamber. A rod is attached to and reciprocally movable along an axis with the at least one diaphragm with the rod including a ferromagnetic material. An induction coil disposed around the rod wherein relative axial movement between the inductance coil and the ferromagnetic material of the rod varies the inductance of the induction coil. Also provided is a diaphragm pump having an active feedback system in which the rod has an electrically conductive, diametrically tapered portion. A linear displacement sensor is disposed next to the tapered portion which induces a current in the tapered portion and generates an output voltage proportional to a relative position between the linear displacement sensor and the tapered portion.

Abstract: A combination sight glass and optical sensor is provided in the housing of a hermetic compressor to provide effective visual inspection in addition to automatic sensing of the level of oil in an oil sump. A sight glass fitting is provided in the housing and has a first portion that extends outwardly from the housing and that is accessible from outside the compressor. An optical oil level sensing device is removably attached to the first portion of the sight glass with electrical leads extending outside the compressor for connection to a compressor controller. A prism or similar device is attached to the sight glass fitting intermediate the sump oil and the optical sensor. The sensing device includes a light source, a photosensitive detector, and an opaque member to prevent cross coupling between the light source and the detector.

Abstract: The rated system pressure in a pressure control system is adjusted through a pressure relief valve (2). In addition to the pressure relief valve (2), the system includes a check valve (4), a pressure sensor (3), a position switch (10), a first pressure adjustment member (13) for the relief valve, a second pressure adjustment member (12) for the check valve (4), an actuator (16), and a microcontroller (15) with a memory (6) and a display (7). Faults caused by pressure adjustment interactions are prevented by permitting an adjustment of the pressure relief valve only if the check valve is fully open and a pump provides pressure. For this purpose the actuator (16) of the check valve in its normal position prevents an adjustment of the pressure relief valve. Opening the check valve by the actuator permits adjusting the pressure relief valve (2) and the switch (10) operated through the actuator sends a signal to the microcontroller to drive the pump.

Abstract: The disclosed syringe pump and valve assembly utilizes a cylindrical housing having a piston axially moved therein for defining a pump chamber, where the housing is mounted to rotate about its longitudinal axis. A port seat is disposed concentrically of this axis spaced from one housing end, and a seal/valving member has one face seated slidably on the port seat and has its opposite face exposed to the pump chamber. Connectors serve to communicate separate liquid lines to separate respective ports on the port seat, which the seal/valving member first face overlies. The seal/valving member has through opening and/or radial or arcuate channels operable in different rotational member positions to selectively isolate or communicate the lines relative to one another and/or the pump chamber. The seal/valving member is designed to rotate in unison with the housing, and mechanism rotates the housing to locate the seal/valving member as required.

Abstract: An accurate and low cost sensing apparatus for a swash or wobble plate compressor that requires no modifications in compressor design or operation, and which provides a repeatable and accurate measure of compressor speed and stroke. The apparatus includes a sensor module and a stroke sensing circuit. The compressor has an outer housing formed of aluminum or other non-magnetic material, as is customary in automotive air conditioning systems. The sensor module includes a magnetic field responsive sensor such as a Hall Effect or magneto-resistive (MR) sensor, and is attached to the periphery of the housing in proximity to a reciprocating ferrous element such as a bushing shoe on the swash or wobble plate assembly. The sensor produces a quasi-sinusoidal output voltage signal having a frequency proportional to compressor speed, and the stroke sensing circuit determines the compressor stroke by band-pass filtering, amplifying, and peak detecting the signal.

Abstract: A diaphragm failure monitoring system for detecting leakage in a diaphragm of a diaphragm pump. The system includes a pump having an operating chamber containing a working fluid and a pumping chamber for pumping material into and out of the pump and a diaphragm separating the operating and pumping chambers. A first optic fiber is joined to the operating chamber for transmitting an optic signal across the working fluid. A second optic fiber is joined to the operating chamber for receiving the optic signal from the first optic fiber. An electric signal establishing device establishes a first electrical signal when the optic signal from the first optic fiber to the second optic fiber passes through uncontaminated working fluid.

Abstract: A combined air moving product illuminated panel and device which has a base and a housing, which housing contains a motor and blades for moving air, which product has a device mounted in the housing, with an electroluminescent panel mounted behind and in contact with the device, to indicate, its location, and to illuminate its display.

Abstract: The invention relates to a device and a method to determine the delivery rate or mass flow rate of material conveyed by a high density liquid piston pump (10) through a delivery line (24). The exact determination of the above mentioned variables is achieved by mounting the delivery cylinder (1) in a housing (30) with radial and axial slack and suspending it on at least one weighing cell (36) forming one piece with the housing.

Abstract: A bicycle air pump includes a cylinder adapted to be secured to the bicycle frame having a cylinder bore within which a piston reciprocates, a crank shaft rotatably supported on the cylinder and drivingly coupled to the piston by means of a connecting rod and a driving mechanism for coupling the crank shaft to the bicycle chain to be driven thereby so that when the bicycle pedals are actuated to drive the bicycle chain, the bicycle chain forces the crank shaft to rotate and thus making the piston reciprocate within the cylinder bore to pump air through an outlet of the cylinder.

Abstract: A compressor includes a housing having an upward extending tube coupled to a pressure gage. A piston is slidably received in the housing and has an annular groove for loosely receiving a sealing ring and has one or more notches communicating with the annular groove of the piston. A gear is driven by a motor and coupled to the piston with an eccentric pin for moving the piston along the housing in a reciprocating action. The gear has one half of greater teeth than that of the other half for increasing the driving effect of the compressor.

Abstract: A method for controlling working fluid surge in a centrifugal compressor. According to the method, surge detection is accomplished by calculating the change in the compressible fluid mass flow rate that accompanies surge in a compressor, the compressor having means for sensing a first fluid temperature, means for sensing a first pressure, means for sensing a second pressure, and means for measuring current drawn by a compressor prime mover, the method comprising the steps of: calculating the time rate of change of the first fluid temperature; calculating the time rate of change of the first fluid pressure; calculating the time rate of change of the second fluid pressure; calculating the time rate of change of current drawn by the compressor prime mover; calculating the mass flow rate by combining the calculated rates of change; and comparing the calculated mass flow rate to a predetermined acceptable mass flow rate to determine if surge is present.

Abstract: In a method for the detection of cavitations in a space to be monitored, the space to be monitored is monitored by means of a sensor (2) which is capable of learning. In this, a state in which cavitations arise in any case in the space to be monitored is first produced during a learning process for the duration of a first time interval (t1). After the completion of the first time interval (t1) a state in which cavitations do not arise in any case in the space to be monitored is produced for the duration of a second time interval (t2). In each of the two time intervals the sensor (2) learns which signals correspond to cavitations and which signals correspond to non-cavitations respectively in the space to be monitored.

Abstract: A pressure gauge of a tire pump includes a chamber communicated with the chamber and a pressure indicator is movably received in the chamber. The pressure indicator has a tube with a head portion attached to a first end thereof and a receptacle defined in a second end thereof. The head portion is in slidable contact with an inner periphery of the chamber and the tube is not in contact with the inner periphery of the chamber. A first rotational member is rotatably mounted to an end wall defining the receptacle of the tube. A second rotational member is rotatably mounted to the end member. A spring has a first end securely attached to the first rotational member to move therewith and a second end securely attached to the second rotational member to rotate therewith. Thus, rotational effect of the spring during movement of the pressure indicator is eliminated to provide accurate tire pressure indication.

Abstract: A diaphragm failure sensing apparatus for use in a diaphragm pump having at least two pumping cavities, each pumping cavity having a fluid chamber and a motive gas chamber separated by a pumping diaphragm. The diaphragm failure sensing apparatus includes a fluid conduit for connection with each of the motive gas chambers of the diaphragm pump, a sensor chamber connected to the fluid conduit, and a check valve located in the fluid conduit for alternately connecting the sensor chamber to the motive gas chambers. Also provided is a diaphragm pump having at least two pumping cavities, each pumping cavity having a fluid chamber and a motive gas chamber separated by a pumping diaphragm. A fluid conduit is disposed between and connected individually to each of the motive gas chambers and a sensor chamber is connected to the fluid conduit which is alternately connected to the motive gas chambers by a check valve located in the fluid conduit.

Abstract: A sequential controller is provided for sequencing multiple electric loads such electric pumps. That is, for each cycle the next load is designated as the lead load in a round-robin fashion. The controller uses cost effective electro-mechanical relay logic an thus avoids conventional solid state technology. In order to sequence the loads on each successive cycle, the electro-mechanical relay connected to the sensors comprises a double-throw contact set. The double-throw contact set comprises two complementary contacts, both of which alternate between normally open and normally closed on each successive cycle. In this manner one each successive cycle, the pumps designated as the lead pump and the lag pump automatically alternate in a round-robin fashion. Further, when the lead pump is disabled the lag pump is immediately actuated without disruption of service.

Abstract: A motor system using a totally enclosed fan-cooled (TEFC) electric motor to provide power. The motor enclosure may be sealed with a variety of sealing devices, including a double mechanical seal a single mechanical seal, a double lip seal injected with grease, a labyrinth seal, and/or a repeller positioned adjacent the motor enclosure. A release mechanism prevents the fan from creating excessive drag when the system is immersed in water. The fan cools the motor when the water level is below the motor, and the surrounding water combines with the fan to cool the motor when the water level rises to at least partially surround the motor. When the fan is at least partially immersed, the release mechanism substantially prevents the fan from imposing a load on the motor due to the surrounding water. The release mechanism can take the form of a shear key, a torque-release clutch or flexible fan blades. Alternatively, a separate fan motor may be provided for driving the cooling fan.

Abstract: In a liquid infusion apparatus, an incremental linear encoder is arranged along the feeding shaft direction of the liquid infusion apparatus to directly monitor the movement and position of a carriage part which applies an action to a plunger. A detecting sensor is provided at a starting point of a remaining liquid quantity small region to recognize the absolute position at said region by using feed-back pulses from said encoder. A pressing device for pressing a flange of the plunger to a plunger receiving portion of a slider by holding arms is provided. A pressure sensor is arranged between said plunger receiving portion and the slider to detect a negative pressure applied to the plunger in such a manner that the other operation states of pressure are detected based on a detected value of pressure at which the flange is pressed to the plunger receiving portion.

Abstract: A high-pressure reciprocating pump is constructed such that a plurality of plungers connected to a driver are made to move back and forth and intake channels or discharge channels are opened and closed by valves in synchronism with movements of the plungers for transferring a fluid under high pressure.