The invention relates to an integrated air-supply unit, in particular for air-suspension systems for motor vehicles, said unit comprising an air compressor having an electric motor and an air dryer. The air compressor together with the electric motor, air dryer and a number of pneumatic connections form a functional unit.

There is provided a technology for properly preventing an insulation member from melting during welding without reducing the efficiency of a motor. A compressor includes: a motor including a shaft, a rotor fixed to the shaft, and a stator surrounding the rotor; a compression unit that compresses a refrigerant as a result of rotation of the shaft; and a shell that houses the shaft, the motor, and the compression unit therein. The stator includes a stator core including an annular back yoke portion, a plurality of teeth portions, and slots formed between adjacent teeth portions, coils wound around the plurality of teeth portions, an insulation member that is disposed in the slots and interposed between the stator core and the coils to insulate the stator core and the coils, and at least one projection portion that forms a gap.

A natural gas compressor can include a pre-staging chamber that couples with a supply line to receive natural gas from the supply line. The compressor can additionally include a first-stage chamber that couples with the supply line to receive natural gas from the supply line. The first-stage chamber can additionally be coupled with the pre-staging chamber to receive from the pre-staging chamber natural gas that has been compressed by the pre-staging chamber. The compressor can also include a second-stage chamber configured to receive natural gas that has been compressed by the first-stage chamber.

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.

A valve plate assembly for a compressor according to the principles of the present disclosure includes a valve plate and a suction valve retainer. The valve plate is configured to separate suction-pressure working fluid entering a cylinder of the compressor from discharge-pressure working fluid exiting the cylinder of the compressor. The valve plate defines a discharge valve seat. The suction valve retainer is configured to retain a suction valve within a suction valve seat disposed about a central longitudinal axis of the cylinder.

A valve plate assembly for a compressor according to the principles of the present disclosure includes a valve plate and a suction valve retainer. The valve plate is configured to separate suction-pressure working fluid entering a cylinder of the compressor from discharge-pressure working fluid exiting the cylinder of the compressor. The valve plate defines a discharge valve seat. The suction valve retainer is configured to retain a suction valve within a suction valve seat disposed about a central longitudinal axis of the cylinder.

A fluid end assembly comprising a plurality of fluid end sections positioned in a side-by-side relationship. Each fluid end section comprises a housing having a bore formed therein for housing a reciprocating plunger. Fluid is prevented from leaking around the plunger by a packing seal assembly. The packing seal assembly comprises one and only one packing seal.

A fluid end assembly comprising a plurality of fluid end sections positioned in a side-by-side relationship. Each fluid end section comprises a housing having a bore formed therein for housing a reciprocating plunger. Fluid is prevented from leaking around the plunger by a packing seal assembly. The packing seal assembly comprises one and only one packing seal.

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.