A tappet assembly for use in translating force between a camshaft lobe and a fuel pump assembly via reciprocal movement within a tappet cylinder having a guide slot. The tappet assembly comprises a tappet body defining a pair of apertures and a pair of seats, and a follower assembly. The follower assembly has a shaft, a first bearing and a second bearing, each supported on the shaft for engaging the camshaft lobe. An intermediate element is further supported on the shaft between the first and second bearings and has a platform for engaging the fuel pump assembly. The intermediate element is at least partially disposed in the pair of seats of the tappet body and the shaft is disposed in the pair of apertures of the tappet body.

A foam pump for generating a foam including a foamable liquid and air has dual, coaxial air and liquid cylinders, each having a respective air and liquid piston which move together during a dispensing operation. In certain embodiments, the air and liquid cylinders are modular, separately formed components. In certain embodiments, a plurality of differently sized, liquid cylinders are provided, each with a corresponding liquid piston which is complementary in size thereto. Providing multiple differently sized liquid cylinder and piston components allows the pump to be configured to deliver a desired quantity of foamable liquid and/or a desired liquid-to-air ratio in the foam output of the pump. The differently sized liquid cylinder and piston components can be used interchangeably with a common air cup design and other common pump components, the modular construction allowing custom pump output configurations to be provided with minimal tooling investment per output size.

A foam pump for generating a foam including a foamable liquid and air has dual, coaxial air and liquid cylinders, each having a respective air and liquid piston which move together during a dispensing operation. In certain embodiments, the air and liquid cylinders are modular, separately formed components. In certain embodiments, a plurality of differently sized, liquid cylinders are provided, each with a corresponding liquid piston which is complementary in size thereto. Providing multiple differently sized liquid cylinder and piston components allows the pump to be configured to deliver a desired quantity of foamable liquid and/or a desired liquid-to-air ratio in the foam output of the pump. The differently sized liquid cylinder and piston components can be used interchangeably with a common air cup design and other common pump components, the modular construction allowing custom pump output configurations to be provided with minimal tooling investment per output size.

The present invention discloses a super-power five-cylinder plunger pump, including a power end assembly, a hydraulic end assembly and a reduction gearbox assembly. The power end assembly is designed as a segmented structure including a crankcase, a crosshead case and a spacer frame. One end of the crosshead case is connected to the crankcase, and the other end of the crosshead case is connected to the spacer frame. The hydraulic end assembly is disposed at an end of the spacer frame and is connected to the crankcase through bolts sequentially passing through the spacer frame and the crosshead case. The reduction gearbox assembly is connected to the crankcase. A crankshaft in the crankcase is forged from alloy steel and includes six axle journals and five bellcranks. One bellcrank is disposed between every two adjacent axle journals, and the distance between the center of rotation of the bellcrank and the center of rotation of the crankshaft is 110 to 160 mm. Beneficial Effects: The super-power five-cylinder plunger pump has a rated input power of 5000 hp to solve the problem that there is no existing plunger pump of a specification matching high-power electric motors in electric drive fracturing, and solve the conflict between the limited well-site conditions in the oil and gas fields and the need of multiple matched fracturing equipment.

A piston drive device includes: a motor; an eccentric body provided at an eccentric position with respect to a rotation axis of the motor and revolving about the rotation axis in conjunction with rotation of the motor; a piston holder swinging about the rotation axis in conjunction with revolving of the eccentric body; and pistons held by the piston holder in such a manner as to be positioned radially about an eccentric axis of the eccentric body, wherein the pistons are arranged in a same plane perpendicular to the eccentric axis.

A roller tappet for a high-pressure fuel pump or for a valve drive of an internal combustion engine is provided. The tappet can be guided in a direction of a longitudinal axis thereof in a housing receptacle and can be driven displaceably by a cam shaft of the internal combustion engine. The tappet includes a tappet body which has a guide cylinder, and a cup-shaped sleeve supported axially and radially on the guide cylinder. The sleeve includes a bearing surface for the pump piston or a valve drive element, and the guide cylinder includes a rotatable roller mounted on support flanks, by means of which roller the roller tappet can be supported on the internal combustion engine camshaft. The sleeve has, at its end region facing away from the bearing surface, a ring-shaped shoulder for radial support and an end ring for axial support on the guide cylinder.

A piston pump, in particular high-pressure fuel pump for an internal combustion engine, includes a pump housing, a pump piston and a conveying chamber defined at least by the pump piston and the pump housing. A seal for sealing the conveying chamber and a separate guide element for guiding the pump piston may be arranged between the pump piston and the pump housing. The seal is designed as a metal sleeve, and may have a radially outwardly projecting web.

A piston pump, in particular high-pressure fuel pump for an internal combustion engine, includes a pump housing, a pump piston and a conveying chamber defined at least by the pump piston and the pump housing. A seal for sealing the conveying chamber and a separate guide element for guiding the pump piston may be arranged between the pump piston and the pump housing. The seal is designed as a metal sleeve, and may have a radially outwardly projecting web.

A plurality of guide shafts which are disposed parallel to an input/output shaft (a first input/output shaft, a second input/output shaft) are assembled in a case body which holds a cylinder in which first and second piston sets, move reciprocally. A first guide bearing, which abuts both side surfaces of a first piston body and receives only lateral pressure generated by the reciprocal movement, and a second guide bearing, which abuts both side surfaces of a second piston body and receives only lateral pressure generated by the reciprocal movement, are assembled coaxially and separated in an axial direction on each guide shaft.

A pumping device for processing a liquid comprises: a plurality of pistons, each of which is slidable along a movement direction in order to vary the volume of a corresponding chamber; a casing inside of which a driving device is housed for moving each piston of the plurality of pistons along the movement direction; a head inside of which the chambers are at least partially obtained; a plurality of suction valves, each one of which is associated with a chamber and is operable for enabling the liquid to enter the chamber; a plurality of delivery valves, each one of which is associated with a chamber and is operable for enabling the liquid to exit the chamber.

Each suction valve has an axis arranged transversely with respect to a further axis of the delivery valve associated with the same chamber. The pumping device further comprises an intermediate body interposed between the casing and the head. The intermediate body is provided with a guide device for guiding each piston along the movement direction.