A monitoring system may include at least a strain gauge and a computing device for determining a bulk modulus of a fluid system of a pressure pump using strain measurements. The strain gauge may determine strain in a chamber of the pressure pump. The computing device may receive a strain signal generated by the strain gauge and may correlate the strain signal to pressure to determine a change in pressure during a period in which fluid is isolated in the chamber. The computing device may use the change in pressure during this period to determine a bulk modulus of the fluid system.

An analysis system may determine a discharge pressure or a suction pressure using a single measurement sensor coupled to a computing device. The measurement sensor may include a pressure sensor or a strain sensor. In some aspects, the pressure sensor may generate a pressure signal representing the total pressure in a chamber of the pressure pump. The computing device may apply an envelope filter to the pressure signal to determine the discharge or suction pressure in the chamber from the pressure signal. In other aspects, the strain sensor may generate a strain signal representing the strain in the chamber. The computing device may determine the discharge or suction portions of the strain signal and may correlate the portions with a predetermined internal pressure for the pressure pump to determine the discharge or suction pressure in the chamber.

A monitoring system may include a position sensor, a strain gauge, and a computing device for determining the condition of a valve in a chamber of a pump using strain measurements. The strain gauge may determine strain in the chamber. The position sensor may determine the position of a crankshaft coupled to a plunger in the chamber. The computing device may receive signals generated by the strain gauge and the position sensor related to the strain in the chamber and the position of the crankshaft, respectively, and may process the signals to determine delays in the actuation of the valves.

A fuel supply device includes: a linear actuator; a reciprocating pump having a boosting piston driven by the linear actuator and configured to reciprocate in an axial direction, the reciprocating pump being configured to suck the fuel when the boosting piston moves in a first direction and configured to boost and eject the fuel when the boosting piston moves in a second direction; and a controller configured to control driving of the linear actuator so as to adjust an amount of the fuel ejected from a boosting cylinder per reciprocating time by adjusting a ratio of a fuel ejection time and a fuel suction time of the reciprocating pump without changing the reciprocating time of the boosting piston in accordance with a load of the internal combustion engine. The adjustment adjusts a stroke length of the boosting piston and a moving speed of the boosting piston in the second direction.

Systems, methods, and non-transitory media for monitoring a reciprocating compressor determining a valve opening of a valve disposed in the reciprocating compressor using a sensor and determining a first location of a piston of the reciprocating compressor at the valve opening. The monitoring also includes determining a valve closing of the valve using the sensor and determining a second location of the piston at the valve closing. Furthermore, the monitoring includes estimating a volumetric efficiency based at least in part on the first and second location.

A method for a system having a plurality of primary fluid sources and a fluid output with a common pump includes halting pumping of a first fluid, isolating the common pump from the fluid output and the primary fluid sources, connecting an inlet of the common pump to a solvent source and an outlet of the common pump to a waste fluid dump, actuating the common pump first in a pumping mode, then in a recirculation mode, and then in a flush mode, connecting an inlet of the common pump to a second primary fluid source, and an outlet of the common pump to the output line, and starting pumping mode pumping of a second fluid from the second primary fluid source through the output line.

Equipment for continuous regulation of the flow rate of fluid in a reciprocating compressor which has a compression chamber with a piston reciprocally movable therein. The compression chamber has an inlet valve and an outlet valve which delivers fluid to a reservoir. A translation device is movable to open the valve and allow closing of the valve. An actuator engages the translation device and includes a rod. The rod has a magnitizable central element located between solenoids of an electromechanical device. The central element is located in a prefixed position with respect to the solenoids under the resilient loading of a resilient device. Detectors are provided for detecting the position of the piston, the pressure in the reservoir and the position of the actuator.

The present invention relates to a compressor system (1) comprising: a high-pressure diaphragm gas compressor (2) having a compressor inlet (3) and a compressor outlet (4). Wherein an inlet volume (5) is defined between a compressor inlet valve (6) and said compressor inlet, said compressor outlet is fluidly connected to a receiving vessel (7). A motor (8) configured to drive a crankshaft of said compressor. A controller (9) configured to control operation of said compressor, said compressor inlet valve and said motor, during a plurality of successive operation cycles. Wherein during a shut-down part of an operation cycle, said compressor inlet valve is configured for being closed before said crankshaft stop rotation, and wherein during a start-up part of a subsequent operation cycle, said compressor inlet valve is configured for being opened after at least one completed compression stroke.

Techniques and apparatus are provided for improved diagnostics of downhole dynamometer data for control and troubleshooting of reciprocating rod lift systems. A method for pump fillage determination for a reciprocating rod lift system is provided. The method generally includes measuring downhole data during a pump cycle, wherein the downhole data comprises a first plurality of data points associated with an upstroke of the pump cycle and a second plurality of data points associated with a downstroke of the pump cycle, each data point comprising a rod position value and an associated rod load value; converting the data points to non-dimensional data points, calculating non-dimensional slope values between non-dimensional data points; and determining pump fillage based, at least part, on the calculated non-dimensional slope values.

A medical fluid pumping system includes a medical fluid pump for pumping a process fluid and a medical fluid chassis operable with the medical fluid pump. The medical fluid pump includes a first pump chamber, a first inlet valve chamber including a first inlet valve diaphragm, a first outlet valve chamber, a second pump chamber, a second inlet valve chamber including a second inlet valve diaphragm, and a second outlet valve chamber. The medical fluid chassis includes a motive fluid source providing motive fluid at a motive fluid pressure. The first and second inlet valve diaphragms are configured to actuate from an open to a closed position at a pressure less than the motive fluid pressure to mitigate process fluid backflow through the first and second inlet valves.