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Poppet valves are recommended up to 15 MPa differential pressure or 30 MPa discharge
pressure and 600rpm.
Plate Type Valve
Reciprocating Compressor Basics Components
The plate type valve contains concentric rings of valve plates. The concentric ring
valve plates are a single element. Since the valve plate is made of a single element,
flow control is much easier when compared to other types of valves.
The stress act on the valve plate is much higher than the Poppet valve. These type of
valves are widely used compressor handling of Oil-free gases.
Crank Shaft曲轴
Larger compressors, normally above 150 kW(200 hp), the crankshaft is made up of
forged steel. Compressor less than or equal to 150kW, the crankshaft is made up of
ductile iron.
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.
Backup Ring支承环
The construction of the backup ring is similar to the radial ring. As the name
indicate this type of ring is used to backup all the rings when using in the high-
pressure application.
The crankshaft is connected to drive, to transfer the rotary motion.
When force lubrication is used, drilled oil passage is provided in the crankshaft.
Different types of rings are used for lubricated or non-lubricated service. In the case of non-lubricated service, the rings shall have good self-lubricated property. Piston rings are made up of PEEK and other fluorocarbon compounds.
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