An electro-mechanical actuation system for a piston-driven fluid pump. The electro-mechanical actuation system includes a plurality of electro-mechanical actuators, and a control system electrically connected to the plurality of electro-mechanical actuators. Each electro-mechanical actuator is configured to operatively couple with a piston of the fluid pump. The control system is configured to determine a target output of fluid to be pumped by the fluid pump, individually control a speed and a phase at which each electro-mechanical actuator actuates the piston, such that the plurality of cylinders collectively pump fluid at an actual output that corresponds to the target output, and in response to detecting an operating condition, individually adjust the speed and/or the phase at which one or more of the electro-mechanical actuators actuates the piston based on the operating condition to thereby cause the actual output of the fluid pump to correspond to an updated target output.

A rotatable piston assembly for a reciprocating piston type hydraulic machine includes a rotatable piston configured for a controlled rotation and configured to reciprocate within a cylinder bore of the reciprocating piston type hydraulic machine.

A hydraulic pump assembly for a vehicle is provided, comprising an electrical motor, a hydraulic pump driven by the electrical motor, and a centrifugal regulator connected with a pressure overflow valve connected to the oil outlet of the hydraulic pump, characterized in that the pump assembly further comprises at least two input check valves and at least two output check valves arranged such that a first pressure outlet port is formed when the motor is rotating in a first direction, and a second pressure outlet port is formed when the motor is rotating in an opposite direction.

This describes an axial piston pump (1, 1) with inclined plate for pumping a liquid comprising: a head (20) in which there are at least partially made a plurality of cylinders (25a, 25b, 25c, 25d, 25e) in a number greater than three, with central axes parallel to each other, a plurality of pistons (75) each one sliding in a respective cylinder (25a, 25b, 25c, 25d, 25e) of the plurality of cylinders (25a, 25b, 25c, 25d, 25e) for pumping liquid, a plurality of suction valves (115), each one housed in a respective housing seat made in the head (20), a plurality of suction channels (155a, 155b, 155c, 155d, 155e) made in the head, one for each suction valve (115), each of which, independently from the other suction channels, places a housing seat of a suction valve (115) in fluid communication with the corresponding cylinder (25a, 25b, 25c, 25d, 25e), a plurality of delivery valves (120), each one housed in a respective housing seat made in the head (20), a plurality of delivery channels (160a, 160b, 160c, 160d, 160e) made in the head, one for each delivery valve (120), each of which, independently from the other delivery channels, places a cylinder (25a, 25b, 25c, 25d, 25e) in fluid communication with the housing seat of the corresponding delivery valve (120).

This describes an axial piston pump (1, 1) with inclined plate for pumping a liquid comprising: a head (20) in which there are at least partially made a plurality of cylinders (25a, 25b, 25c, 25d, 25e) in a number greater than three, with central axes parallel to each other, a plurality of pistons (75) each one sliding in a respective cylinder (25a, 25b, 25c, 25d, 25e) of the plurality of cylinders (25a, 25b, 25c, 25d, 25e) for pumping liquid, a plurality of suction valves (115), each one housed in a respective housing seat made in the head (20), a plurality of suction channels (155a, 155b, 155c, 155d, 155e) made in the head, one for each suction valve (115), each of which, independently from the other suction channels, places a housing seat of a suction valve (115) in fluid communication with the corresponding cylinder (25a, 25b, 25c, 25d, 25e), a plurality of delivery valves (120), each one housed in a respective housing seat made in the head (20), a plurality of delivery channels (160a, 160b, 160c, 160d, 160e) made in the head, one for each delivery valve (120), each of which, independently from the other delivery channels, places a cylinder (25a, 25b, 25c, 25d, 25e) in fluid communication with the housing seat of the corresponding delivery valve (120).

A fluid end having its fluid flow bores sealed without threading a retaining nut into the walls of each bore. The fluid ends may be assembled using a plurality of different kits that each comprise a fluid end body, a component, a retainer element, and a fastening system. The retainer element holds the component within each of the bores formed in the fluid end body and the fastening system secures the retainer element to the body. The fastening system comprises a plurality of externally threaded studs, washers and nuts in some embodiments. In other embodiments, the fastening system comprises a plurality of screws.

A fluid end having its fluid flow bores sealed without threading a retaining nut into the walls of each bore. The fluid ends may be assembled using a plurality of different kits that each comprise a fluid end body, a component, a retainer element, and a fastening system. The retainer element holds the component within each of the bores formed in the fluid end body and the fastening system secures the retainer element to the body. The fastening system comprises a plurality of externally threaded studs, washers and nuts in some embodiments. In other embodiments, the fastening system comprises a plurality of screws.

A hydraulic arrangement (1) is provided comprising a pressure exchanger (2) having an axis (3) of rotation, and a booster pump (4), said pressure exchanger (2) and said booster pump (4) being connected to each other. Such a hydraulic arrangement should have a good efficiency. To this end a single connection flange (5) is provided between said pressure exchanger (2) and the booster pump (4).

There is provided a wobble plate piston water pump for use in a pressure washer and driven by a driving source, the water pump includes a pump body, a wobble plate, four or more pistons and a water passage defined by a water inlet and a water outlet. The driving source being electric powered and having a power consumption of less than or equal to a 15 ampere draw at 120 volts or 220 volts or the driving source being gas powered and having an engine displacement of less than or equal to 250 cubic centimetres.

A diaphragm pump mechanism is powered by steam generated by an internal heater coil heating the pumped water, which moves the diaphragm and an attached piston to pump water through the pump. The heater coil is turned on-and-off using a switch that is timed to the movement of the pump. The water is pumped through a series of one-way rubber valves and reed valves to prevent a back flow of water. The pressure generated by the steam is released when a reed valve located on the diaphragm makes contact with a pin located on the body of the pump, opening the reed valve and allowing the steam to travel through and to condense. The piston and diaphragm are returned to the starting position when the steam pressure is released by a spring attached to the pump shaft. On the return stroke an accumulator refills the diaphragm chamber with water.