A hydraulic fan drive includes an adjustable variable-displacement pump by which a pressurized fluid can be sucked in and can be delivered via a pump pressure port and which has, for adjustment of the delivery volume, an adjustment device with an actuation chamber, which is delimited by an actuation surface of an adjustment piston and to which a pressurized fluid can be supplied for increasing the delivery volume and from which pressurized fluid can be displaced for reducing the delivery volume. The adjustment device further includes a counter chamber, which is delimited by a counter surface, smaller in cross section in comparison with the actuation surface, of an adjustment piston and can be acted on by pump pressure. The adjustment device also includes an actuation spring, which acts so as to adjust the delivery volume toward an extreme value.

An axial piston machine has a swash plate and an adjusting device having an adjusting cylinder and a double-acting adjusting piston which is longitudinally movable in the adjusting cylinder and includes a piston and a piston rod, which is fixedly connected to the piston and is articulated to the swash plate. The joint between the adjusting piston and the swash plate is a movable swivel joint having a joint body receptacle on one part and a joint body on the other part of the adjusting piston and the swash plate. The joint body is closely guided in the joint body receptacle in the direction of movement of the adjusting piston, is to rotatable about an axis of rotation running parallel to the pivot axis of the swashplate, and is movable with a directional component perpendicular to the direction of movement of the adjusting piston and perpendicular to the axis of rotation.

An axial piston machine has a swash plate and an adjusting device having an adjusting cylinder and a double-acting adjusting piston which is longitudinally movable in the adjusting cylinder and includes a piston and a piston rod, which is fixedly connected to the piston and is articulated to the swash plate. The joint between the adjusting piston and the swash plate is a movable swivel joint having a joint body receptacle on one part and a joint body on the other part of the adjusting piston and the swash plate. The joint body is closely guided in the joint body receptacle in the direction of movement of the adjusting piston, is to rotatable about an axis of rotation running parallel to the pivot axis of the swashplate, and is movable with a directional component perpendicular to the direction of movement of the adjusting piston and perpendicular to the axis of rotation.

A submersible pumping system has an electric motor, a rotary hydraulic pump driven by the electric motor, and a linear hydraulic pump that is configured to move a production fluid. The rotary hydraulic pump produces a pressurized working fluid that drives the linear hydraulic pump. In another aspect, a method is disclosed for controlling the temperature of an electric motor within a submersible pumping system disposed in a wellbore. The method includes the steps of circulating motor lubricant through a hydraulically driven production pump to reduce the temperature of the motor lubricant.

A submersible pumping system has an electric motor, a rotary hydraulic pump driven by the electric motor, and a linear hydraulic pump that is configured to move a production fluid. The rotary hydraulic pump produces a pressurized working fluid that drives the linear hydraulic pump. In another aspect, a method is disclosed for controlling the temperature of an electric motor within a submersible pumping system disposed in a wellbore. The method includes the steps of circulating motor lubricant through a hydraulically driven production pump to reduce the temperature of the motor lubricant.

A modular hydraulic device comprising: a housing having a receptacle having a first open end, a second end and a first port, the first port for facilitating an ingress and an egress of hydraulic fluid with respect to the housing; a sleeve configured to be received in the first open end and abut the second end; and an end cap for closing the first open end once the sleeve is inserted in the receptacle; the sleeve having: a body having a fourth lan (L4) positioned in the body for aligning with first port; a main cylinder for holding a main piston for reciprocation about a reciprocation axis; and a first bore portion fluidly coupled to the first lan, the first bore portion for receiving the ingress of the hydraulic fluid and for outputting the egress of the hydraulic fluid; wherein once assembled the main piston is coupled to a cam for facilitating said reciprocation.

The present invention relates to a process pump having a crank mechanism (1) and at least three cylinders that represent a first cylinder, a second cylinder and a third cylinder when seen clockwise or counterclockwise around the crank mechanism (1), wherein the crank mechanism (1) has a vertical crankshaft and for each cylinder a crosshead (7, 10, 13) each and a connecting rod (8, 11, 14), each having a large connecting rod top end (8a, 11a) for receiving the crankshaft, wherein the crossheads (7, 10, 13) are functionally connected to the crankshaft via the connecting rods (8, 11, 14). The invention is characterized in that the crankshaft is formed as an eccentric shaft (5) with a first eccentric and a second eccentric, wherein the connecting rod (8) of the first cylinder and the connecting rod (14) of the third cylinder are arranged on the first eccentric, and wherein the connecting rod (11) of the second cylinder is arranged on the second eccentric, so that the large connecting rod top end (8a) of the connecting rod (8) of the first cylinder and the large connecting rod top end of the connecting rod (14) of the third cylinder have a common central axis.

A pump assembly including a power end including an output shaft having an output shaft axis. In addition, the pump assembly includes a fluid end including a piston configured to reciprocate to pressurize the working fluid. Further, the pump assembly includes a transmission coupled to each of the power end and the fluid end. The transmission includes a carriage coupled to the piston and a pivoting arm pivotably coupled to the carriage at a first connection about a first pivot axis. The first pivot axis extends in a perpendicular direction to a direction of the output shaft axis, and rotation of the output shaft about the output shaft axis is configured to cause the pivoting arm to pivot about the first pivot axis at the first connection and to cause the carriage to reciprocate.

A pump assembly including a power end including an output shaft having an output shaft axis. In addition, the pump assembly includes a fluid end including a piston configured to reciprocate to pressurize the working fluid. Further, the pump assembly includes a transmission coupled to each of the power end and the fluid end. The transmission includes a carriage coupled to the piston and a pivoting arm pivotably coupled to the carriage at a first connection about a first pivot axis. The first pivot axis extends in a perpendicular direction to a direction of the output shaft axis, and rotation of the output shaft about the output shaft axis is configured to cause the pivoting arm to pivot about the first pivot axis at the first connection and to cause the carriage to reciprocate.

Disclosed embodiments include a reconfigurable multi-stage gas compressor having a first-stage compression cylinder, a second-stage compression cylinder, and two stepped cylinders. Each of the stepped cylinders include first and second compression cylinders. The gas flow paths through the stepped cylinders are configured in a user-selectable configuration to be in series or in parallel so that the reconfigurable multi-stage gas compressor functions as one of: a three-stage compressor, as a four-stage compressor, and as a hybrid three/four stage compressor. In first and second configurations, the system generates four stages of compression and outputs 4-stage compressed gas through a single exit port, and through dual exit ports, respectively. In a third configuration, the system outputs hot and cooled 3-stage compressed gas through first and second ports and 4-stage compressed gas through a third port. In a fourth configuration, the system outputs hot and cooled 3-stage compressed gas with no 4-stage compressed gas.