A method of manufacturing a fluid end block for a high pressure reciprocating pump, including forming, from a single-piece forging of a steel alloy, a main body having an outwardly facing body forward face, an outwardly facing body rear face opposite the body forward face, and opposing side surfaces connecting the forward face and the rear face, and a plurality of chambers; forming a web portion protruding outwardly from the outwardly facing body forward face, the web portion having an outwardly facing web forward face and a curvilinear side surface; forming a plurality of bosses protruding from the web forward face and having a forward facing end; and forming a plunger bore extending through each of the plurality of bosses from the forward facing end of the respective boss to one of the plurality of chambers in the main body portion, each plunger bore configured to receive a reciprocating plunger.

A method of manufacturing a fluid end block for a high pressure reciprocating pump, including forming, from a single-piece forging of a steel alloy, a main body having an outwardly facing body forward face, an outwardly facing body rear face opposite the body forward face, and opposing side surfaces connecting the forward face and the rear face, and a plurality of chambers; forming a web portion protruding outwardly from the outwardly facing body forward face, the web portion having an outwardly facing web forward face and a curvilinear side surface; forming a plurality of bosses protruding from the web forward face and having a forward facing end; and forming a plunger bore extending through each of the plurality of bosses from the forward facing end of the respective boss to one of the plurality of chambers in the main body portion, each plunger bore configured to receive a reciprocating plunger.

A pump may generally include a frame including a reservoir. The reservoir stores a hydraulic fluid. The pump may also include a motor assembly supported by the frame and a pump assembly operably driven by the motor assembly. The pump assembly is in fluid communication with the reservoir and configured to dispense the hydraulic fluid out of the frame. The pump assembly includes a first piston and a second piston, wherein the first piston dispenses hydraulic fluid out of the frame between a first pressure and a second pressure greater than the first pressure, and the second piston dispenses hydraulic fluid out of the frame between the first pressure and a third pressure, the third pressure being greater than the second pressure.

A slow rate pumping system which includes a discharge line to receive a discharge flow of displacement fluid from a high rate pumper, a return line off of the discharge line to receive a return flow of displacement fluid, a slow rate diversion pumping line off of the discharge line for supplying a diversion flow of displacement fluid downhole, a return valve to control the return flow, and a diversion valve to control the downhole flow. A method of supplying a slow rate flow which includes receiving a main pumping flow through a return line at a pumping pressure, producing a differential pressure between the pumping pressure and a downhole pressure matching a differential setpoint, diverting a slow rate flow of fluid from the main flow using a diversion line off the return line prior to the return valve, and maintaining the differential pressure.

A fluid end includes a housing having a bore extending toward a cavity and a wear sleeve positioned within the bore. The fluid end also includes a plunger positioned within a plunger bore extending through the wear sleeve, the plunger reciprocating within the plunger bore. The fluid end further includes a wear sleeve retainer coupled to the housing and positioned to block axial movement of the wear sleeve, the wear sleeve retainer having external threads along a body that engage internal threads formed in the housing. The fluid end also includes an anti-rotation system, coupled to the housing, the anti-rotation system engaging the wear sleeve retainer to block rotation of the wear sleeve retainer in at least one direction. The fluid end further includes a packing nut coupled to the wear sleeve retainer.

Disclosed is a method for controlling a fuel pump for a motor vehicle, including determining if a set amount of fuel to be compressed is less than the minimum volume that can be delivered by the pump and, if this is the case, determining a new set amount of fuel to be compressed equal to the product of a number of compressions of a volume equal to the set amount of fuel to be compressed required to achieve at least the minimum volume that can be delivered and the set amount of fuel to be compressed; transmitting the new set amount of fuel to be compressed to the fuel pump; and subsequently disabling the fuel pump for a number of occurrences of the set amount of fuel equal to the number of compressions of a volume equal to the set amount of fuel to be compressed.

Disclosed is a method for controlling a fuel pump for a motor vehicle, including determining if a set amount of fuel to be compressed is less than the minimum volume that can be delivered by the pump and, if this is the case, determining a new set amount of fuel to be compressed equal to the product of a number of compressions of a volume equal to the set amount of fuel to be compressed required to achieve at least the minimum volume that can be delivered and the set amount of fuel to be compressed; transmitting the new set amount of fuel to be compressed to the fuel pump; and subsequently disabling the fuel pump for a number of occurrences of the set amount of fuel equal to the number of compressions of a volume equal to the set amount of fuel to be compressed.

An electrohydraulic motor vehicle control device, in particular for a motor vehicle brake system, includes a hydraulic unit with electrically activated valves, an electronic control unit which includes a first printed circuit board with electric and/or electronic components for actuating the valves, and an electric motor for driving an electrically controllable, hydraulic pressure source, wherein electric and/or electronic components, in particular power electronics components for actuating the electric motor are arranged on a second printed circuit board which is arranged separately from the electronic control unit.

An electrohydraulic motor vehicle control device, in particular for a motor vehicle brake system, includes a hydraulic unit with electrically activated valves, an electronic control unit which includes a first printed circuit board with electric and/or electronic components for actuating the valves, and an electric motor for driving an electrically controllable, hydraulic pressure source, wherein electric and/or electronic components, in particular power electronics components for actuating the electric motor are arranged on a second printed circuit board which is arranged separately from the electronic control unit.

A hydraulic fracturing system for fracturing a subterranean formation includes an electric powered pump having an inlet and an outlet, the outlet coupled to a well associated with the subterranean formation and powered by at least one electric motor. The system also includes a fluid source, coupled to the inlet of the electric powered pump, the fluid source providing a slurry for injection into the subterranean formation. The system further includes a hose extending between the fluid source and the electric powered pump, the hose being flexible and having a first diameter. The system includes a fitting between the hose and the electric powered pump, the fitting having a first end for receiving the hose at the first diameter and a second end for coupling to the electric powered pump at a second diameter, the second diameter being larger than the first diameter.