The frame is integrally cast with fine grained iron and adopts the structure of strengthening rib, and its bearing seat is precisely bored.

    The frame is provided with light top cover and side cover to facilitate maintenance of the bearing and the parts, and it may be fitted with pressure release unit.

    The surface of the durable and fine-machined shell crankpin bearings and the shell main bearings is coated with an extreme-thin Babbitt metal to ensure the optimal conformability and long service time. The circulation lubrication oil system designed as per API 614 realizes the forced lubrication of the bearing shell. The shell main bearings between the crankshaft throws and the bearing shell at the drive end are provided with the most stable supports to minimize the crankshaft deflection, the inner stress, and the load of the bearing shell.

    The high-precision main bearings are fixed at both sides of each crankshaft throw to ensure good support and long service life.

    It is made of high-strength alloy steel forging and is subjected to elimination of inner stress and heat treatment. All journals and crankshaft throws are finely ground and polished to meet the roughness standard and ensure the good conformability. Each side of the crankshaft throw is provided with bearing shell to minimize the deflection.

    It ensures safety within large range of speed and load. It is fitted with the upper and the lower slide shoe, and the center position of piston rod may be adjusted without removal of them. The balance weight may be easily loaded or unloaded to obtain the initial inertia force. A special crosshead "Supernut" needs no big wrench nor hydraulic tightening unit.

    PTFE (filled polytetrafluoroethylene) or other compositematerials are used in the oil-lubricated and oil-free pistonring and wear band, and this design may prevent thepiston and cylinder liner from direct contact, which mayincrease the service life, especially in the case where thelubrication may be interrupted for a while.

    The compressors will be different depending on the gas volume, pressure, temperature, and
gas type. In the last decades, a set of effective and reliable series of cylinders was developed on basis of the application experiences of compressor, and they are suitable for various
applications.

    The cylinders are made of cast iron, ductile cast iron, cast steel, composite carbon steel, stainless steel, or forged steel, and are suitable for various oil-lubricated and oil-free cases.

    Our distance piece is suitable for any gas compression process, which involves with the oil-lubricated cylinder or oil-free cylinder, and corrosive, inflammable, explosive and toxic gases which would contaminate the machine oil in the crankshaftcase. Most to-compress gases are dangerous, corrosive, toxic or inflammable, and thus the distance piece of the product adopts the air-tight design, and as per the requirement the gas is discharged or nitrogen is filled.
    There are API "D" type dual-chamber distance piece and long API "B" type standard single distance piece, and the body of any distance piece is provided with window sealed with metallic cover for maintenance of the packing.
    The distance piece bears the maximum load of the reciprocating piston rod, and thus for improving the strength, the distance piece is made of ductile cast iron and is surely fixed between the frame and the cylinderwith roll-threaded bolts.