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Case piston
The aluminium alloy used for the pistons has exceptional strength, anti-friction properties and resistance to wear at high temperatures.
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 If the metal is to soft, the risk of scuffing increases. If it is to hard, it will cause excessive wear in the cylinder and piston rings
Composite rings
Lubrication is a challenge in double-acting compressors. It is difficult for oil to get past the step up to the upper section. Here, we use composite rings, which have exceptional anti-friction and anti-wear properties even without oil. The special formula ensures that the rings dissipate heat from the piston efficiently.
 In double-acting pistons, virtually oil-less lubrication is essential to prevent excessive wear to the rings and cylinder liner.
Cast-iron rings
These rings provide a seal between the high-pressure part of the cylinder and the crankcase.
The rings must fit the grooves exactly to prevent blow-by. Air seeping past the rings will reduce capacity. This may increase oil consumption and cause coking of the rings in the grooves.
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Gudgeon pin
Extremely close tolerances (down to 8/1,000 millimetre) are essential for the bore in the piston, the diameter of the gudgeon pin and the bore of the gudgeon pin. The quality of the machining is vital.
If the clearance of the gudgeon pin is too great, it may damage the bore of the piston. If it is too tight, it will be difficult to remove without damaging the piston. It will not fit the crosshead bearing properly, causing inadequate lubrication and damage to the bearing.
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