Disclosed is a status monitoring and fault diagnosis system for a plunger pump, including a monitoring and fault diagnosis device. The monitoring and fault diagnosis device monitors and diagnoses a hydraulic end assembly of a plunger pump. The monitoring and fault diagnosis device further monitors and diagnoses a power end assembly and/or a reduction gearbox assembly. Beneficial effects: The diagnosis system monitors and diagnoses not only a hydraulic end assembly, but also a power end assembly and/or a reduction gearbox assembly, that is, an equipment fault can be accurately predetermined in time for an entire plunger pump, so that high-pressure, large-displacement, and continuous operation requirements on fracturing sites at present are better satisfied, and on-demand maintenance is adopted instead of regular examination and maintenance, thereby saving labor, time, and materials to achieve economic efficiency.

A pump control method for controlling at least one booster pump (4). The method includes switching on the booster pump when a booster pump outlet pressure (24) drops to a lower limit value (26), and switching off the booster pump when the booster pump outlet pressure (24) reaches an upper limit value (28). The lower limit value (26) is reduced in a case, in which the maximal outlet pressure (24a) which can be reached on operation of the booster pump (4) lies below the lower limit value (26). A pressure-boosting device is also provided with which the pump control method can be carried out.

A hydraulic drive device according to an embodiment includes a main pump and a single pressure gauge. The main pump controls discharge flow rates of a first hydraulic oil and a second hydraulic oil discharged into two or more first pressure oil supply passage and second pressure oil supply passage with a single swash plate. The main pump is a swash plate variable displacement type split flow hydraulic pump. The pressure gauge measures an intermediate pressure of the discharged fluid at a merging point between the first pressure oil supply passage and the second pressure oil supply passage. The discharge flow passage is controlled based on a pressure value obtained by the pressure gauge.

An automatic self-driving pump system features a pump/motor/drive detector and an automatic self-driving and control design/setup module. In operation, the pump/motor/drive detector receives sensed signaling containing information about a pump/drive for operating in a hydronic pump system, e.g., stored in and sensed from a signature chip or barcode installed that can be scanned by a scanner, and provides corresponding database signaling containing information about parameters for providing automatic pump control design, setup and run to control the pump/drive for operating in the hydronic pump system, based upon the sensed signaling received. The automatic self-driving and control design/setup module receives the corresponding database signaling, and provides control signaling containing information for providing the automatic pump control design, setup and run to control the pump/drive for operating in the hydronic pump system, based upon the corresponding database signaling received.

A method operates a construction material and/or viscous-material pump having: at least one conveying cylinder, the conveying cylinder being designed to receive and discharge construction material and/or viscous material; and at least one conveying piston, the conveying piston being disposed in the conveying cylinder for movement in order to draw construction material and/or viscous material into the conveying cylinder and to displace drawn-in construction material and/or viscous material out of the conveying cylinder. The method includes: conveying construction material and/or viscous material, by movement of the conveying piston in order to draw in and displace construction material and/or viscous material; sensing a position variable during the movement, the position variable characterizing a position of the conveying piston along its stroke in the conveying cylinder; sensing a conveying variable during the movement, the conveying variable being of a different type than the position variable and characterizing the conveying of construction material and/or viscous material by the pump; and determining a profile of a subsequent movement of the conveying piston by linking the sensed position variable and the sensed conveying variable to each other; and controlling the subsequent movement in accordance with the determined profile.

An air compressor includes: a motor actuating a mechanism to generate compressed air; a tank part in which the compressed air is stored; a pressure detector detecting a pressure value in the tank part; and a controller driving the motor when the pressure value is equal to or smaller than an ON pressure value and to stop drive of the motor when the pressure value is equal to or greater than an OFF pressure value. The controller executes processing for detecting a continuous drive time or a continuous stop time of the motor and changing at least one of the ON pressure value, the OFF pressure value and an output of the motor, and the controller detects a change amount of the pressure value, and to determine an execution cycle of the processing or a change amount of a value in the processing, based on the detected change amount.

A system for monitoring a hydraulic fracturing pump includes a first sensor configured to measure a discharge fluid pressure of the pump, a second sensor configured to sense a displacement of a crankshaft of the pump, a processor communicatively coupled to the first and second sensors and configured to analyze the sensor data and determine a cycle count, duty cycle, and operating hour value for the positive displacement pump, and a display coupled to the processor configured to display the cycle count, duty cycle, and operating hour value.

A pressure boosting device increases pressure of a fluid flowing through a conduit (5) and includes a booster pump (2), a control device (12), controlling the booster pump (2), as well as a pressure sensor (8) arranged at the exit side of the booster pump (2) and connected to the control device. The control device (12) is configured to control the booster pump, in an operating region, in a start-stop operation, a switching off of the booster pump (2) when reaching an upper pressure limit value (P.sub.1) and a switching on of the booster pump (2) when reaching a lower pressure limit value (P.sub.2). The control device (12) is further configured in a start-stop operation to automatically adapt at least one pressure control parameter (P.sub.1, P.sub.2) of the control device (12) on the basis of the temporal course of at least one pressure value (P) detected by the pressure sensor.

Devices and methods for operating a diaphragm compressor system provide high output pressure and high throughput. In some embodiments, modular diaphragm compressors are stacked with a clamping mechanism pressing the compressor modules together. In embodiments, multiple stacks are provided as stages of a pressurization process. In embodiments, a main stage valve controls one or more pressure circuits for one or more hydraulic actuators of compressor modules. In embodiments, orifices configured for damping are incorporated to control actuator piston movement within a compressor module.

A variable displacement pump for supplying fluid to a system is described. Controlling the variable displacement pump is determined based upon inputs from a fluidic pressure sensor and an accelerometer, and includes determining a desired fluidic pressure and monitoring, via the fluidic pressure sensor, an actual fluidic pressure. A pressure error term is determined based upon a difference between the actual fluidic pressure and the desired fluidic pressure. A time-integrated pressure error term is determined based upon the pressure error term, and a g-force is determined based upon an input signal from the accelerometer. The variable displacement pump is controlled in response to the time-integrated pressure error term when the g-force is greater than a threshold g-force.