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Poppet Valves are not tolerant of uneven flow distribution. The poppet valve is used
in a medium pressure range compressor. Nowadays these types of valves are used in
hydrocarbon service because of easy maintenance.
Bearing
The main and connecting rod bearings should be split-sleeve, steel-backed, babbitted
insert type. Antifriction bearing shall be used for compressor rating less than
150kW. As per API-618 trapper roller bearings are used as the main bearing for
compressor rating less than 150kW.
The packing rings are the important element of rod packing assembly. The below-listed
packing rings are widely used in a reciprocating compressor.
Cross Head十字头
All industrial compressors are equipped with crosshead. The crosshead is used to
guide the piston in the cylinder bore. The following are the advantage of the crosshead.
Gives greater stability to the piston, eliminating piston “slap” and reducing ring wear
Permits stronger piston design and higher operating pressures.
The rider ring is one-piece configuration, to accommodate the rider ring the piston is segmented construction. As per API-618 one-piece rider rings are a required. Rider band life can be extended by rotating a piston 120° to 180° at each overhaul.
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