The invention relates to a method for operating a piston pump with a differential cylinder drive (1) with at least two differential cylinders (2, 3) for driving at least two conveying pistons movable in conveying cylinders, each conveying piston being driven via an associated differential cylinder (2, 3) of the differential cylinder drive (1) for operating the piston pump, with a hydraulic circuit (4) for driving the differential cylinder drive (1) by the action of hydraulic fluid. The invention also relates to a piston pump for carrying out the method.

The invention relates to a method for operating a piston pump with a differential cylinder drive (1) with at least two differential cylinders (2, 3) for driving at least two conveying pistons movable in conveying cylinders, each conveying piston being driven via an associated differential cylinder (2, 3) of the differential cylinder drive (1) for operating the piston pump, with a hydraulic circuit (4) for driving the differential cylinder drive (1) by the action of hydraulic fluid. The invention also relates to a piston pump for carrying out the method.

A gas transfer and depressurization system that is configured to transfer gas from a first location to a second location wherein during the transfer of gas the pressure of the first location is reduced. The gas transfer and depressurization system includes a drive chamber having an interior volume with a drive assembly movably disposed therein. A first cylinder and a second cylinder are operably coupled to the drive chamber on opposing sides thereof. The drive assembly includes a drive rod having portions extending into the first cylinder and second cylinder wherein the drive rod has pistons formed on opposing ends thereof. A controller is operably coupled to a compressed air source and is configured to provide compressed air into said drive chamber so as to reciprocally move the drive assembly. Gas blocks and coupling block are additionally present and facilitate flow of gas intermediate the first and second cylinders.

A gas transfer and depressurization system that is configured to transfer gas from a first location to a second location wherein during the transfer of gas the pressure of the first location is reduced. The gas transfer and depressurization system includes a drive chamber having an interior volume with a drive assembly movably disposed therein. A first cylinder and a second cylinder are operably coupled to the drive chamber on opposing sides thereof. The drive assembly includes a drive rod having portions extending into the first cylinder and second cylinder wherein the drive rod has pistons formed on opposing ends thereof. A controller is operably coupled to a compressed air source and is configured to provide compressed air into said drive chamber so as to reciprocally move the drive assembly. Gas blocks and coupling block are additionally present and facilitate flow of gas intermediate the first and second cylinders.

An electrically operated displacement pump includes an electric motor having a stator and a rotor. The rotor is connected to the fluid displacement member to drive axial reciprocation of the fluid displacement member. A drive mechanism is disposed between and connected to each of the rotor and the fluid displacement member. The drive mechanism receives a rotational output from the rotor and provides a linear input to the fluid displacement member. A controller controls operation of the motor based on an operating state of the motor to control pumping by the displacement pump.

A mud pump is provided that includes a pump shaft having substantially circular eccentric lobes. Each lobe is rotatably mounted in a connecting rod that, in turn, moves a slide in a horizontal and linearly manner. A pony rod operatively couples a pump fluid end module to one or both sides of each slide frame and a pump fluid end module. As the pump shaft turns, each lobe causes the slide to move side to side. As the slide moves side to side, each pony rod operates a pump fluid end module whose outputs can be coupled to a common manifold.

A compressor moves a fluid from an inlet to an outlet and provides a pressure differential there between due to respective pistons moving in and out of a plurality of piston chambers via a piston rod. A rotating shaft extends through a grooved end plate, and the rotating shaft is connected to either the grooved end plate or the piston rod. The grooved end plate defines an off center or eccentric groove. A bearing extends from the piston rod and fits within the groove such that when the rotational motion of the shaft rotates either the piston rod or the grooved end plate, the piston rod slides back and forth relative to the rotating shaft. Each position of the bearing within the groove determines a corresponding position of the piston rod relative to the rotating shaft. Each pair of pistons may extend from a single, continuous piston rod.

A portable hydraulic power unit includes a frame, a fluid tank supported by the frame, and a manifold supported by the frame. The fluid tank is configured to store a supply of hydraulic fluid for powering a hydraulically-driven tool. A reciprocating pump is mounted on the exterior of the fluid tank and on the exterior of the manifold. The reciprocating pump is secured to the fluid tank and the manifold with fasteners extending through a cylinder body of the reciprocating pump.

A portable hydraulic power unit includes a frame, a fluid tank supported by the frame, and a manifold supported by the frame. The fluid tank is configured to store a supply of hydraulic fluid for powering a hydraulically-driven tool. A reciprocating pump is mounted on the exterior of the fluid tank and on the exterior of the manifold. The reciprocating pump is secured to the fluid tank and the manifold with fasteners extending through a cylinder body of the reciprocating pump.

A fluid dispensing device includes a housing and a reciprocating piston fluid pump coupled to the housing. The reciprocating piston fluid pump includes a piston. The piston is configured to pressurize at least one pumping chamber. A motor is connected to the reciprocating piston fluid pump to actuate the piston. A spray tip connected to an outlet of the at least one pumping chamber.