Abstract: One aspect of the invention provides a system including: a liquid filter configured for fluidic communication with a fluid repository; a flow sensor in fluidic communication with the liquid filter; a variable-speed pump in fluidic communication with the liquid filter and the flow sensor; and a processor in electronic communication with the flow sensor and the variable-speed pump. The processor is configured to: activate the flow pump at a specified flow rate; monitor a positioning of the flow sensor during the specified flow rate; and determine a performance status of the system from the flow sensor positioning.

Abstract: Disclosed is a method, apparatus and storage medium for controlling drainage of equipment. The method includes: determining that the equipment is in a drain state; detecting whether a floor drain connected to a drain pipe of the equipment is at risk of drainage overflow or a drainage overflow occurs; and when it is detected that the floor drain is at risk of drainage overflow or the drainage overflow occurs, reducing an amount of water discharging from the drain pipe per unit time.

Abstract: A method of dispensing a therapeutic fluid from a line includes providing an inlet line connectable to an upstream fluid source. The inlet line is in downstream fluid communication with a pumping chamber. The pumping chamber has a pump outlet. The method also includes actuating a force application assembly so as to restrict retrograde flow of fluid through the inlet while pressurizing the pumping chamber to urge flow through the pump outlet. A corresponding system employs the method.

Abstract: A self-contained pressure compensation system and a control method thereof are provided, wherein the self-contained pressure compensation system comprises an oil supply device, a pressure compensation device, a power unit associated with the pressure compensation device, and a switch control device, the pressure compensation device supplies oil to the power unit and detects a change in a chamber pressure of itself in real time, the switch control device triggers the oil supply device to supply oil to the pressure compensation device if the chamber pressure is less than a predetermined first threshold and triggers the oil supply device to stop supplying oil to the pressure compensation device if the chamber pressure is greater than a predetermined second threshold. The invention can detect a chamber pressure of the pressure compensation device in real-time and can achieve automatic oil refilling, and can provide pressure compensation for the power unit effectively.

Abstract: An object of the present invention is to provide a fluid compression system which can supply compressed fluid in accordance with a sudden change in an amount of fluid used even when the number of compressors to be installed is increased, and a control device thereof.

Abstract: An oral care appliance (10) having a pump assembly (14) for delivering discrete bursts or shots of liquid. The pump assembly includes a pump housing (36) and an inlet/outlet assembly (38) at a forward end of the housing, including one-way valves (80, 82) in the inlet and outlet openings. A plunger sleeve (44) is positioned within the housing with a central opening (48) in a fluid-tight relationship with the inlet and outlet assembly. A plunger (52) includes a center portion (56), positioned in the central opening of the plunger sleeve in a fluid-tight relationship therewith. The plunger sleeve includes an outer member (54) between the plunger sleeve and the internal surface of the housing. A compressible spring (64) is positioned between a forward end of the outer member of the plunger and the rear end of the housing.

Abstract: A pressure switch safety system includes a pressure switch for mounting to a mud pumping system. The pressure switch can be moved from a pressure switch open position to a pressure switch closed position when the pressure within the mud pumping system reaches an excess trigger pressure. The excess trigger is greater than the pressure required to activate a pressure relief valve system of the mud pumping system. An alarm and a timer are actuated when the pressure switch is moved from the pressure switch open position to the pressure switch closed position. The timer has a preset time interval. The system has a mud pump shut down control module that will shut down the mud pumping system after the preset time interval has elapsed.

Abstract: Pump assemblies and methods for operating pump assemblies of appliances are provided. A method includes actuating a motor of the pump assembly to begin operation of a pump of the pump assembly, receiving an electrical signal level between a first electrical contact and a second electrical contact provided for sensing fluid flow through the pump, and deactuating the motor when the electrical signal level falls outside of a predetermined electrical signal range.

Abstract: A method to control the temperature of the exhaust gases of a supercharged internal combustion engine, the method comprising: determining the minimum air/fuel ratio of the exhaust gases downstream of the exhaust manifold as a function of the flow rate of air that is not involved in the combustion taking place inside the cylinders and flows directly from the intake manifold into the exhaust pipe; detecting an air/fuel ratio of the exhaust gases downstream of the exhaust manifold by means of a sensor; and controlling the supercharged internal combustion engine as a function of the comparison between the air/fuel ratio of the exhaust gases detected by the sensor and/or the minimum air/fuel ratio of the exhaust gases with a number of threshold values.

Abstract: A system, method, and computer readable medium for calculating well flow rates produced with electrical submersible pumps using measured voltage, current, frequency and pressure data. An efficiency to flow rate ratio is calculated from the voltage, current, and pressure data. The efficiency to flow rate ratio is used to obtain a non-dimensional flow rate. The flow rate through the electrical submersible pump is calculated from the non-dimensional flow rate.

Abstract: In order to improve the efficiency of a method for supplying a cleaning medium, it is suggested that a cleaning gas, in particular, air be introduced into a reservoir (6) and that a cleaning liquid (38) subject to pressure be introduced into the reservoir for acting on the cleaning gas with pressure, said cleaning gas being subject to an initial pressure. Furthermore, a method for cleaning a workpiece and a cleaning device are suggested.

Abstract: A peristaltic pump for use in medical technology with a stator and a rotor. The stator 40 has an occlusion bed 12 which forms the contact area with a tube accommodated within, and the rotor is provided with rolling elements suitable for occluding a tube accommodated between the occlusion bed and the rolling elements. At least a part of the occlusion bed has an electrically conductive surface for reducing and/or preventing electrostatic charging of the tube. The stator may be injection molded from an electrically non-conductive plastic and the electrically conductive surface may be formed by a molded-in metallic insert or a molded-in metallic foil insert.

Abstract: Disclosed herein is an approach that uses a wattmeter to obtain diagnostics of a hydraulic system during transient-state start-up operation. In one aspect, a controller uses the electric power measured by the wattmeter during the transient-state start-up operation to determine fluid flow parameters. In another aspect, the controller determines diagnostics for the hydraulic fluid consuming device and the hydraulic pump unit as a function of the fluid flow parameters.

Abstract: A blood circuit assembly for a dialysis unit may include an organizing tray, a pair of pneumatic pumps mounted to the organizing tray for circulating blood received from a patient through a circuit including a dialyzer unit and returned to the patient, an air trap mounted to the organizing tray arranged to remove air from blood circulating in the circuit, a pair of dialyzer connections arranged to connect to the inlet and outlet of a dialyzer unit, and a pair of blood line connectors, one inlet blood line connector for receiving blood from the patient and providing blood to the pneumatic pumps and the other outlet blood line connector for returning blood to the patient.

Abstract: A control switch incorporates a solid state transducer, a strain gauge. The transducer responds to a local environmental condition, such as fluid level, or pressure and exhibits a parameter change which can be detected as an electrical output. Control circuits coupled to the transducer can sense the parameter change and switch a source of electrical energy to a load in response thereto.

Abstract: A sump water evacuation system that operates automatically without reliance on electricity or floats and without any need for oversight or manual intervention, using domestic water supply as the sole motive force to evacuate sump water either into a washbasin or to the exterior of the building; the system is easily installed for use with Radon remediated sump pits. A pneumatic stagnation pressure automatically signals a rising water level in a sump pit and this signal is communicated to a housing wherein the low-pressure signal is mechanically amplified to activate a tilt valve mechanism, thereby converting the pneumatic signal to a hydraulic force which in turn opens a check valve, allowing a high-pressure domestic water supply to flow through to a commercially available Venturi siphon device, causing the sump water to be suctioned out and expelled into either a washbasin or to the exterior of a building.

Abstract: A character parameters obtaining method for a displacement control mechanism of a hydraulic pump and a detecting device for carrying out the method are disclosed. The method involves constructing a hydraulic system; outputting hydraulic energy by the hydraulic pump driven by a primary motor; detecting pressure of a displacement control mechanism; obtaining middle parameters by obtaining the time required for preset change of the pressure at the output end of the displacement control mechanism; obtaining character parameters of the displacement control mechanism according to the middle parameters. The method can obtain the character parameters of the displacement control mechanism by the pressure detection, so that the performance of the displacement control mechanism can be judged according to the obtained character parameters.

Abstract: A continuous run controller for a dual control compressor system includes an integrated housing containing a pilot valve and a hydraulic unloader valve. Low pressure in the hydraulic oil system opens the hydraulic unloader valve such that the suction valve unloader assembly unloads the compressor. High pressure in an air receiver of the compressor system opens the pilot valve such that the suction valve unloader assembly unloads the compressor.

Abstract: A diaphragm pump comprising a housing for receiving and securely holding a motor, the housing comprising an elongate portion having a closed end and an open end, the elongate portion being adapted to securely receive and house a motor; and a collar portion being provided at the open end of the elongate portion; a cover for the housing, the cover being adapted to engage with the housing; a diaphragm plate extending across the open end of the housing between the collar portion of the housing and the cover and being secured therebetween when the cover is engaged with the collar portion of the housing. The diaphragm pump also includes a wobble plate positioned within the collar portion of the housing.

Abstract: Ultra efficient hydraulic hybrid drivetrain of vehicle with a single cylinder module of engine, air compressor, hydraulic pump and motor transmit power without crankshaft, pipes and hoses. The engine piston fastened to pump plunger located within rotor comprised two diametrically opposite axial rods associated with the plunger, compressor piston and swash plate. This plate turn and independently shift by digital control changes the engine piston stroke, changes the engine compression ratio for super efficient homogeneous charge compression ignition and either kind of fuel use. The hybrid by hydraulic accumulator provides start, idling and work mode of operation. Compressor's piston diameter greater than engine piston diameter and plunger pumping fluid and simultaneously driving additional plungers enables to provide more than 130 hp per liter engine displacement. Such unique features and energy recuperation enables to achieve 80 mile per gallon for the 1500 kg weight medium car in city conditions.

Abstract: Apparatus (200) for the application of topical negative pressure therapy to a user of the apparatus (200) is described together with a method for protecting said apparatus (200) when subjected to abnormal stresses, the apparatus (200) comprising a device (202) and a waste canister (204) releasably connected thereto wherein the device (202) and waste canister (204) are connected together by clip means (222), said clip means (222) being subject to failure upon application of abnormal stresses thereby permitting separation of the device (202) and waste canister (204).

Abstract: A control switch incorporates a solid state transducer, a strain gauge. The transducer responds to a local environmental condition, such as fluid level, or pressure and exhibits a parameter change which can be detected as an electrical output. Control circuits coupled to the transducer can sense the parameter change and switch a source of electrical energy to a load in response thereto.

Abstract: A water-lifting pump apparatus which is free of a discharge valve and a check valve, is low in cost, and is capable of reducing vibration and noise due to a waterfall after the end of water pumping operation. The water-lifting pump apparatus has a suction tank (10), a discharge tank (20), a pump (30) for pumping water in the suction tank (10) into the discharge tank (20), and a discharge piping (50) connected to a discharge side of the pump, an actuator (60) for actuating the pump (50), a reverse flow preventing mechanism (80) for preventing a reverse flow of water pumped into the discharge tank (20) toward the discharge piping (50), and a back flow rate control (90) for controlling the flow rate of a waterfall falling from the discharge piping (50) into the suction tank (10) when pumping operation is finished.

Abstract: The present invention provides a hydraulic pump for use in driving a load with a control modulation system which modulates a primary control signal in order to accommodate variations in secondary changeable parameters which require control at a higher frequency or have a lower latency.

Abstract: The invention relates to improvements in compressors and, in particular, to an improvement in a method of controlling variable speed dynamic compressors to avoid ‘motor overload as a result of choking.1 The invention therefore comprises a method of controlling a compressor to provide compressed gas at a target delivery pressure (Pt) and prevent excessive motor power consumption, the compressor being driven by a variable speed motor which has motor windings, wherein the gas inlet temperature (Tin), gas output delivery pressure (Pd), motor speed (Vm) and the motor winding temperature (Tmw) are continuously measured during operation of the compressor. The gas inlet temperature (Tin) is used to determine a predetermined maximum motor winding temperature (Tmwmax) limit. The maximum motor winding temperature (Tmwmax) is used (to set a maximum motor speed (Vmmax) limit.

Abstract: A sealed electric compressor having a normally-off type pressure switch and a fuse element. The pressure switch is placed in a sealed housing, connected parallel to a main winding of an electric motor, and, when the pressure of refrigerant in the sealed housing is abnormally high, activates to short-circuit the main winding. The fuse element is connected in series to the main winding and an auxiliary winding of the electric motor and interrupts conduction of electricity to the electric motor when an excess current that is produced when the pressure switch short-circuits the main winding flows.

Abstract: A system and method is provided for monitoring a system pressure to infer whether a high pressure cut out (HPCO) switch has opened disabling a heating, ventilating, and air conditioning (HVAC) compressor. A system and method are also provided for determining whether to disable the HVAC compressor based on a status of a low pressure cut out (LPCO) switch, an ambient temperature, and system mode state. The systems and methods may be used interchangeably with the appropriate adjustments to decision limits, such as where the LPCO may be monitored to infer status and the HPCO status may be directly used with temperature and system mode state.

Abstract: A water removal system for removing water from an elevator pit that includes a sump, a pump, a pump input tube, a pump output tube and a switching mechanism. The sump at least partially extends below a lower surface of the elevator pit. The plump mounted outside of the elevator pit. The pump input line is operably connected to the sump and the pump. The pump output line is operably connected to the pump. The switching mechanism is mounted outside of the sump and is operably connected to the pump and the sump.

Abstract: A system that control levels of liquids in reservoirs may include a control component that causes a compressor to pump gas through a tube extending in a liquid in a reservoir to an air bell for a predetermined amount of time responsive to a pump pumping portions of a liquid from the reservoir. The control component may also cause the compressor to pump gas through the tube for a predetermined amount of time responsive to the control component determining that a predetermined amount of time has passed since the compressor was previously operated. The control component may also cause the compressor to pump gas through the tube for a predetermined amount of time, responsive to the control component determining that a pressure sensor component in fluid communication with the tube indicates a possible decrease in the liquid level to at least a predetermined level.

Abstract: A drain protection device and pump controller for pools, spas, fountains and other fluid containment and circulation systems has a vacuum sensor for sensing a level of vacuum present in the suction conduit leading to the pump(s). The vacuum level is monitored by a computer that controls a vent valve that can vent to atmosphere to reduce the vacuum exerted at a drain. In applications with a flooded pump, e.g., above-ground pools, the vent valve may control the discharge of an accumulator that injects fluid pressurized by the return line into the suction conduit to reduce the vacuum therein. The computer also controls the pump(s) present in the circulation system, viz., turns them off to relieve vacuum when a drain is occluded and also runs them at the selected speed based upon a schedule. The vacuum criteria for vacuum reduction may include progressively sensitive values, some of which may be empirically based. Vacuum criteria may be maintained based upon the operational state of the circulation system, e.g.

Abstract: A pressure-controlled liquid supply system uses a pump control device to switch a pump on and off in response to a pressure level in the pumped liquid. The pump control device minimizes short cycling of the pump by preventing shut off of the pump while a flow is present through the pump control device and by delaying the shut off of the pump. The pump control device also avoids a significant drop in the output pressure by creating a reduced pressure zone, which provides the switch pressure used to switch the pump off.

Abstract: A water-lifting pump apparatus which is free of a discharge valve and a check valve, is low in cost, and is capable of reducing vibration and noise due to a waterfall after the end of water pumping operation. The water-lifting pump apparatus has a suction tank (10), a discharge tank (20), a pump (30) for pumping water in the suction tank (10) into the discharge tank (20), and a discharge piping (50) connected to a discharge side of the pump, an actuator (60) for actuating the pump (50), a reverse flow preventing mechanism (80) for preventing a reverse flow of water pumped into the discharge tank (20) toward the discharge piping (50), and a back flow rate control (90) for controlling the flow rate of a waterfall falling from the discharge piping (50) into the suction tank (10) when pumping operation is finished.

Abstract: A water pressurizing pump includes a pump mounted in a compartment of a water tank for pressurizing and outputting water. The compartment is sealed by a cover having a first channel in communication between the compartment and a water supply coupler and a second channel having an end in communication with the first channel. A pressure tank is mounted to the other end of the second channel of the cover. A differential pressure valve unit is slideably mounted in the pressure tank adjacent to the second channel. The differential pressure valve unit is movable by the high water pressure in the second channel to allow water from the second channel to enter the pressure tank.

Abstract: A method is provided for regulating fluid pump pressures by detecting an elevation differential between a fluid flow control device and the distal end of a fluid line in communication with the fluid flow control device. A fluid flow control device, for instance a peritoneal dialysis device, is at a first height, a distal end of a fluid line is at a second height, and a valved outlet, when open, affords communication between the fluid flow control device and the distal end of the fluid line. The elevation differential is correlatable with a pressure measurable during a calibration procedure provided as a part of the methodology.

Abstract: A control system monitors salt level in a brine tank having a water inlet. The control system comprises a memory device storing an amount representing actual salt level in the brine tank. A sensor determines water level in the brine tank. A control valve is operatively connected between a water supply and the water inlet for controllably supplying water to the brine tank. A logic circuit is operatively connected to the memory device, the sensor and the control valve for determining salt level in the brine tank. The logic circuit periodically operates the control valve responsive to sensed water levels to fill the brine tank with water, updates the stored actual salt level in the memory device responsive to water supplied to the brine tank, and provides an indication when actual salt level in the brine tank falls below a select salt level.

Abstract: The monocylindrical hybrid powertrain is provided having a continuously variable volume hybrid engine, a pump, and a hydrostatic motor. A direct energy transmission, a variable displacement volume engine, a pump, and a hydrostatic motor and energy recuperation increases the specific power, decreases the weight, and installation space and enables the vehicle to achieve a fuel economy of 80 miles per gallon for the vehicle in city conditions.

Abstract: A modular system for the control of at least one compression system for the compression a fluid medium, said compression system comprising compressors (C1-C7) and their controllers (A1-A7) for the compression of the fluid medium, secondary treatment devices for the treatment of the medium delivered from the compressors, and piping systems (17-19, 23) for conducting the fluid medium to a place of consumption (16, 22), said control system comprising a control unit (3) containing a data processing system (34) for controlling the compression system, a user interface (35) including a display associated with it and transmission means for the transmission of control data between the control unit, the controllers and pressure sensors. The transmission means consist of data communication buses, preferably serial communication buses (30-32) and a data communication port unit (33) serving to connect the bus to the control unit (34). The controllers and pressure sensors are connected to common data communication buses.

Abstract: Pump apparatus and method. The pump can include a valve assembly and a diaphragm. In some embodiments, the diaphragm can include a convolute that can deform in order to increase a volume of a pumping chamber to provide an internal fluid bypass when a pressure in the pumping chamber exceeds a bypass pressure. In some embodiments, the pump can include a fluid reservoir at least partially defined by a wall with a flow-restrictive conduit in fluid communication with an outlet chamber. A shut-off switch can include an actuator in fluid communication with the fluid reservoir. The fluid reservoir and the flow-restrictive conduit can substantially isolate the shut-off switch from pressure pulses in the outlet chamber.

Abstract: An implantable drug delivery system utilizing a non-magnetic valve/accumulator metering assembly is disclosed. The solenoids of the prior art, which respond to magnetic fields, are replaced by Shape Memory Alloy (SMA) wires and associated control electronics. By exploiting the inherent characteristics of SMA wires, which can expand and contract based on their temperature, the movements required to actuate the metering assembly can be achieved. This configuration retains the benefits associated with the prior art, while eliminating the major drawback.

Abstract: An arrangement (10) for controlling the liquid level in a basin (60) by selectively actuating a pump (64) has an environmentally-sealed enclosure (22) with an internal volume subject to thermal and pressure effects. A first (14) and a second (16) pressure sensing means are positioned in the enclosure and a barrier fluid (18) fills a balance of the internal volume. The first sensing means (14) is in a first chamber (22a) of the enclosure (22) and the second sensing means (16) is in a second chamber (22b). The barrier fluid (18) has a first portion (18a) in the first chamber (22a) and a second portion in the second chamber (22b). The first pressure sensing means (14) communicates an “on/off” signal to the pump (64). Diaphragms (26, 40) in the respective chambers (22a, 22b) allow the device to adjust to changes in atmospheric pressures. The barrier fluid (18) is electrically non-conductive, chemically non-reactive with any materials comprising the pressure sensing means and, preferably, an oil.

Abstract: A pump control system is provided and includes a tank communicated with a flow pipe via a tank port, wherein the flow pipe communicates a fluid source with a fluid destination. A sensing device disposed in proximity to the tank port is also provided and is configured to measure a characteristic of a fluid within the flow pipe. Furthermore, a pumping device and a pump control device communicated with the sensing device via a pump control interface link is provided to receive a signal responsive to the characteristic, wherein the pump control device is configurable to control power flow between a power source and the pumping device responsive to the signal, wherein the pump control device is mounted to a support structure via a mounting device to be disposed remotely from the tank port.

Abstract: A sump draining apparatus having a pressure transducer engaged in a receptacle that is in turn engaged in an open-ended collar of a housing. The receptacle and thus the pressure transducer is slideable in the axial direction into and out of the open-ended collar. The housing is generally cylindrical and contains a pump and motor, each of which has a generally cylindrical shape and is axially stacked in the housing. A cord having a vent and electrical leads for the pressure transducer is releasably engaged via a cord restraint at one end portion of the housing and the pressure transducer is releasably engaged in the receptacle in the open-ended collar at the other end of the housing. The receptacle and sensor may be removed, serviced, and/or replaced without the housing being opened and without the pump and motor being removed.

Abstract: A high-pressure pump for feeding fuel to an internal combustion engine has a pump housing; a fuel delivery duct; and a check valve, which is arranged along the delivery duct, and comprises a fuel chamber; a valve member mobile within the fuel chamber; and a biasing and guiding assembly, which has a fastening member suitable for being fastened to the pump housing and sealing the fuel chamber in a fluid-tight manner; a helical spring suitable for biasing the valve member; and a bushing arranged about the helical spring in order to prevent bending of the helical spring.

Abstract: A fluid transfer systems described herein. The fluid transfer system generally includes a centrifugal multistage pump, a holding tank for holding the fluid operably connected to the pump body via a first conduit, an inlet for receiving the fluid, wherein the fluid is pressurized to form the pressurized fluid, a manifold for passing the pressurized fluid to a second location and an outlet for receiving fluid operably connected to the manifold.

Abstract: A system and method pumps process fluid from a cryogenic storage vessel to a vaporizer, and delivers the fluid as a pressurized gas. The method includes measuring process fluid temperature after the process fluid exits the vaporizer, temporarily suspending operation of the pump when the process fluid temperature is below a threshold temperature, and restarting a suspended pump if at least one predefined enabling condition is satisfied and process fluid pressure is less than a high pressure threshold. The system comprises components that cooperate with one another to execute the method, including a storage vessel, a pump, a vaporizer, a conduit for delivering a pressurized gas from the vaporizer to the end user, a pressure sensor and a temperature sensor for measuring process fluid properties within the conduit, and a controller for commanding operation of the pump responsive to temperature and pressure measurements.

Abstract: A method is provided for regulating fluid pump pressures by detecting an elevation differential between a fluid flow control device and the distal end of a fluid line in communication with the fluid flow control device. A fluid flow control device, for instance a peritoneal dialysis device, is at a first height, a distal end of a fluid line is at a second height, and a valved outlet, when open, affords communication between the fluid flow control device and the distal end of the fluid line. The elevation differential is correlatable with a pressure measurable during a calibration procedure provided as a part of the methodology.

Abstract: Embodiments of the present invention relate generally to certain types of reciprocating positive-displacement pumps (which may be referred to hereinafter as “pods,” “pump pods,” or “pod pumps”) used to pump fluids, such as a biological fluid (e.g., blood or peritoneal fluid), a therapeutic fluid (e.g., a medication solution), or a surfactant fluid. The pumps may be configured specifically to impart low shear forces and low turbulence on the fluid as the fluid is pumped from an inlet to an outlet. Such pumps may be particularly useful in pumping fluids that may be damaged by such shear forces (e.g., blood, and particularly heated blood, which is prone to hemolysis) or turbulence (e.g., surfactants or other fluids that may foam or otherwise be damaged or become unstable in the presence of turbulence).

Abstract: A method for continuously controlling the flow rate of a meat input stream for making a meat product is disclosed. A flow rate algorithm is provided that depends upon pump speed (RPM) for control of the flow rate. A correction factor provides further control of the system and is dependant upon loss in weight data when meat is not being added. When meat is being added and a new target flow rate is desired, a modified correction factor is calculated based upon a previous error factor and a new initial pump speed based on the new target flow rate. The modified correction factor is used to obtain an adjusted pump speed. The RPM of the pump motor is used as the main control of the flow rate, and the loss in weight data fine tunes this RPM parameter for finer control to better achieve a target flow rate.

Abstract: Systems and methods for monitoring operation of a pump, including verifying operation or actions of a pump, are disclosed. A baseline profile for one or more parameters of a pump may be established. An operating profile may then be created by recording one or more values for the same set of parameters during subsequent operation of the pump. A value for a goodness of fit measure comparing the operating profile and baseline profile can be established. If the goodness of fit measure is insufficient, an alarm may be sent or another action taken, for example the pumping system may shut down, etc. An example goodness of fit measure is an R-squared measure.

Abstract: An oscillating type piston is connected to an output shaft of an electric motor through a crankshaft. The piston is provided with a lip ring that slidingly contacts a cylinder. The motor is rotated forward and reversely by using a control circuit. Thus, different regions of the piston are subjected to a load during forward rotation of the motor and during reverse rotation thereof. Accordingly, wear of the lip ring can be distributed to different regions thereof.