A suction pressure acquisition unit acquires pressure data indicating pressure of a pump. A variation coefficient calculation unit calculates a variation coefficient indicating amplitude of pressure magnitude of the pump on a basis of the pressure data acquired by the suction pressure acquisition unit. An adjustment unit performs adjustment detection information that includes the variation coefficient calculated by the variation coefficient calculation unit, by using a pressure transmission coefficient representing ease of transmission for pressure of the pump. The detection information is used for cavitation occurrence detection. A determination unit 125 detects cavitation occurrence in the pump on a basis of the detection information adjusted by the adjustment unit.

A pneumatically driven fluid pump apparatus is disclosed which includes a pump casing having an inner wall, a pump cap secured at a first end of the pump casing, and a liquid discharge tube in communication with the pump cap and extending at least partially within an interior area of the pump casing toward a second end of the pump casing, and where fluid is admitted into the pump casing at the second end. The pump cap has an airflow inlet for receiving a pressurized airflow from an external pressurized air source, which helps displace liquid collecting within the pump casing upwardly through the liquid discharge tube. A flow channeling subsystem is in communication with the airflow inlet and directs the pressurized airflow towards the inner wall of the pump casing to create a swirling airflow within the pump casing that extends along at least portions of the inner wall. The swirling airflow entrains fluid within the pump causing the fluid to move in a circumferential swirling fashion toward the second end of the pump casing, which helps to clean the inner wall of the pump casing.

A diaphragm pump includes: a housing; a diaphragm; an actuator configured to reciprocate the diaphragm based on a previously selected operation mode out of a plurality of operation modes; a setting device configured to set and send an operation mode and operating conditions; and a control device configured to receive the operation mode and the operating conditions from the setting device, and control the actuator to move the diaphragm forward or backward in accordance with the operation mode and the operating conditions received from the setting device. The plurality of operation modes include a normal operation mode in which the actuator is driven to perform a series of a suction process to suck a fluid and a discharge process to discharge the sucked fluid, and a partial operation mode in which the actuator is driven to perform the series of processes partially.

A precision volumetric pump with a bellows hermetic seal provides compliance time performance comparable to a conventional pump having a dynamic seal. However, the precision volumetric pump with a bellows hermetic seal is enabled to operate over a very long service life with minimal or no maintenance without a propensity to develop leaks over the long service life.

The present invention relates to a method for moving a fluid comprising the steps a. providing a metering head comprising a metering chamber and a displacement element which delimits said metering chamber, b. moving the displacement element in a suction direction from a first position to a second position, wherein a volume of the metering chamber in the second position of the displacement element is greater than a volume of the metering chamber in the first position of the displacement element such that fluid is drawn into the metering chamber via a fluid inlet during a suction stroke, c. moving the displacement element in a pressure direction from the second position to the first position such that fluid is forced out of the metering chamber via a fluid outlet during a pressure stroke. In order to provide a method for moving a fluid or a corresponding metering pump with which a number of the aforementioned disadvantages are prevented without the need for additional components, it is proposed according to the invention that the movement of the displacement element in suction direction during the suction stroke involve at least two changes of direction before the displacement element reaches the second position and/or that the movement of the displacement element in pressure direction during the pressure stroke involve at least two changes of direction before the displacement element reaches the first position.

A fluid transport system includes at least one flow control device and a multiphase pump configured to transport fluid. At least one pump sensing device is configured to measure at least one operating characteristic of the multiphase pump. A controller is programmed with a pump map including a correlation of the at least one operating characteristic of the multiphase pump with at least one operating characteristic of the fluid. The controller is configured to determine an estimated value of the at least one operating characteristic of the fluid based on the measured value of the at least one operating characteristic of the multiphase pump and the pump map. At least one regulating device coupled to at least one flow control device is modulated based on the estimated value of the at least one operating characteristic of the fluid.

A method for determining cavitation in a pump is disclosed. The method includes detecting, by a sensor, a pressure of a fluid pumped by the pump and determining, by a controller, whether the pressure exceeds a pressure range. Cavitation is determined when the pressure exceeds the pressure range. The method includes selectively incrementing or decrementing, by the controller, a counter value of a counter based on determining whether the pressure exceeds the pressure range. The counter value is incremented when the pressure exceeds the pressure range, and decremented when the pressure does not exceed the pressure range. The method includes determining, by the controller, whether the counter value exceeds a threshold value, and generating, by the controller, an alert when the counter value exceeds the threshold value and causing, by the controller, the alert to be displayed via a display.

Method and apparatus overcoming gas-lock in reciprocating downhole pumps. On the downstroke of a plunger in a barrel, gassy fluid is compressed in the pump chamber between standing and travelling valves. Downhole plunger movement drags a sleeve over a mandrel for opening a chamber valve to a staging chamber located at a downhole end of the travelling valve for receiving at least a portion of the compressed and gassy fluid therein. On the upstroke, the chamber valve is dragged closed for sealably retaining the compressed gassy fluid therein while drawing an additional increment of fluid through the standing valve into the pump chamber. Continued downstroke and upstroke cycles increases pressure of the compressed gassy fluid in the pump chamber until it exceeds the hydrostatic head above the travelling valve for resumption of normal fluid pumping.

A pneumatically driven fluid pump apparatus is disclosed which includes a pump casing having an inner wall, a pump cap secured at a first end of the pump casing, and a liquid discharge tube in communication with the pump cap and extending at least partially within an interior area of the pump casing toward a second end of the pump casing, and where fluid is admitted into the pump casing at the second end. The pressurized airflow causes a swirling flow of the liquid within the interior area of the pump casing that helps to clean the interior area of the pump casing by liquid scrubbing action to dislodge debris adhered within the interior area of the pump casing and remove the debris up through the liquid discharge tube and out from the fluid pump apparatus during a liquid eject cycle.

A system includes a sorting chamber and a fluid channel in fluid communication with the sorting chamber. A peristaltic pump is in fluid communication with the fluid channel to pump fluid through the fluid channel to the sorting chamber at a fluid flow rate. A fluid damper is in fluid communication with the sample fluid channel. The fluid damper includes a gas and reduces variations in the fluid flow rate by compression and expansion of the gas in response to fluid flow in the fluid channel.