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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.
The Figure shows a drilled crankshaft.
Crankshafts should have removable balance weights to compensate the rotary unbalance
as well as reciprocating unbalances. The crankshaft should be dynamically balanced
when above 800 rpm.
The connecting rod is made up of forged steel for 150 kW (200 hp) reciprocating
compressor. For compressor less than or equal to 150kW, ductile iron material is
used.
Gives greater stability to the piston, eliminating piston “slap” and reducing ring wear
Permits stronger piston design and higher operating pressures.
Connecting Rod连杆
Purpose of the connecting rod is to connect the crankshaft and the crosshead. The
connecting rod converts the rotary motion into reciprocating motion. The connecting
rod bolts and nuts shall be securely locked with cotter pins or wire after assembly.
Like Crankshafts, the connecting rod has drilled hole for oil passage.
Piston活塞
The piston is the heart of the reciprocating compressor. The piston transfers the energy from the crankcase to the gas in the cylinder. In order to avoid the leakage of compressed gas between the piston and cylinder, the piston is equipped with a set of sliding seals called piston rings. Usually, the piston rings are made of a material, that having self-lubricating property to reduce the slide friction force
between the cylinder and the piston.
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