A drive system for a pump includes a housing defining an internal pressure chamber, a working fluid disposed within and charging the internal pressure chamber, and a reciprocating member disposed within the internal pressure chamber. A fluid displacement component has first and second surfaces. The first surface is configured to contact the working fluid and the second surface is configured to contact the process fluid. The area of the first surface is greater than the area of the second surface. A pull extends between and connects the reciprocating member and the fluid displacement component. The pull mechanically transfers a pulling force from the reciprocating member to the fluid displacement component.

A multi-stage piston compressor with a cooling arrangement is provided. The multi-stage piston compressor includes a compressor unit having a plurality of air-cooled cylinders on a crankcase housing, a motor unit that is mounted at an end face of the crankcase housing, and a cooler unit at an opposing end face of the compressor unit. An axial fan wheel of the cooler unit blows cooling air substantially outwards toward the compressor unit. In order to conduct cooling air externally in the region of said compressor unit, at least one air guide housing mounted between the cooler unit and the crankcase extends at least partially radially around the crankcase in a curved manner, such that the axial air flow generated by the axial fan wheel is at least partially guided around the crankcase in the radial direction and toward at least one cylinder at the air outlet side of the air guide housing.

A natural gas pumping system that includes a reciprocating compressor having at least two cylinders, a first conduit in fluid communication with an outlet of the first cylinder, a second conduit in fluid communication with an outlet of the second cylinder, and a junction in fluid communication with the first conduit and the second conduit.

Provided is a performance testing device including: a compressor configured to generate compressed air; an air storage tank configured to receive the compressed air generated by the compressor; a regulator connected to each of the compressor and the air storage tank to control a pressure of the compressed air; a main supply line connected to the regulator to move the compressed air; an input port line and an output port line connected to the main supply line to receive the compressed air from the air storage tank and deliver the compressed air to an input port or an output port of a test object; and a pneumatic booster configured to pressurize the compressed air received in the input port line or the output port line, wherein in order to test a performance of the test object, the pressurized compressed air is applied to the input port or the output port of the test object.

A double-headed piston type swash plate compressor includes a rotation shaft, a housing, a swash plate, two cylinder bores, a double-headed piston, and two shoes. The double-headed piston includes two shoe holders, a neck, two heads, and two coupling portions. Each of the coupling portions includes an outer portion and an inner portion. A direction orthogonal to both of an opposing direction of the inner portion and the outer portion and the axial direction of the double-headed piston is referred to as a widthwise direction. The neck is larger in the widthwise direction than in the opposing direction so that the neck is deformable in the opposing direction. Each of the two coupling portions has a width that is less than or equal to a width of the neck. The inner portion includes a narrow portion. The narrow portion is at least partially located closer to the head than the shoe holder in the inner portion. The two coupling portions are deformable in the widthwise direction when the swash plate applies load to the double-headed piston.

A pressure multiplier having a cylinder assembly, a command device, and an electronic control unit is provided. The electronic control unit is configured to obtain a switching signal to be provided to the command device from a compression curve which, knowing pressure of a fluid entering the pressure multiplier, binds a pressure increase of the fluid exiting the pressure multiplier with a switching frequency of a piston of the cylinder assembly.

A pump or compressor includes a rotating shaft, and at least a first piston rod substantially perpendicular to the rotating shaft and connecting a first pair of pistons at opposite ends of the piston rod. The piston rod moves back and forth relative to the rotating shaft. The compressor additionally includes a circular eccentric, and a circular ring connected to the circular eccentric via a bearing. A drive pin engages the circular ring at a fixed position on the circular ring and engages the at least a first piston rod. When rotational motion of the shaft rotates either the first piston rod and first pair of pistons or the circular eccentric, the drive pin and the first piston rod move back and forth relative to the rotating shaft.

The purpose of the present invention is to provide a reciprocating compressor which is a compact, light-weight, portable air compressor such that deterioration of performance due to problems such as wear on the surface finish of the cylinder when the compressor is used for a long period of time outside the operating temperature range thereof is prevented. To achieve this, the cylinder temperature is detected, and control is carried out so that the compressor is restarted at a lower restart pressure when the temperature is lower than a prescribed value and stopped (and also restarted, preferably) at a low pressure when the temperature is higher than a prescribed value.

A turn-back coaxial gas pressurizing pump and gas pressurizing method using the same, relate to the field of gas pressure boosting. The turn-back coaxial gas pressurizing pump includes a primary cylinder, a primary piston, a secondary cylinder serving as a rod of the primary piston, a pressure bar, an air pump bonnet, a secondary piston and a piston rod. The primary cylinder, the secondary cylinder and the piston rod are arranged coaxially. A rear end of the piston rod extends through a first non-returning adaptive valve provided in the primary piston and is fixed on the bottom wall of the primary cylinder. As a result, the two pistons move in opposite directions to boost the pressure.

A reciprocating piston machine includes a first cylinder and a first piston assigned to the first cylinder and a second piston assigned to the first cylinder or a second cylinder. The reciprocating piston machine further includes a crankshaft having an eccentric crankshaft journal and a drive shaft coupling configured for coupling a drive shaft of a drive motor for driving the crankshaft, a first connecting rod configured to deflect the first piston and configured to be moved by the eccentric crankshaft journal, and a second connecting rod configured to deflect the second piston and configured to be moved by a bearing pin. The reciprocating piston machine additionally includes at least one of a first elastomer element arranged between the bearing pin and the first connecting rod and a second elastomer element arranged between the bearing pin and the second connecting rod.