mycom 2016 C Series Instruction Manual page 30

(A) Properly adapted Vi to load condition
Both the required compression ratio and Vi are low.
Suction
Suction port closed
Low Vi conditions
(B) Improperly adapted Vi to load condition
Vi is too low compared to the required compression ratio.
Suction
Suction port closed
Operation under
low Vi and high
compression ratio
Figure 2-12 Relationship between Volume ratio (Vi) and Operation Conditions
Compound 2-stage Screw Compressor 2016**C
Chapter 2 Configuration and Specifications of Compressor
Discharge
Compression
Discharge
port
opened
Rotor rotation angle
Discharge
Compression
Discharge
port
opened
Rotor rotation angle
Both the required compression ratio and Vi are high.
Suction
Suction port closed
High Vi conditions
Vi is too high compared to the required compression ratio.
Suction
Suction port closed
Operation under
high Vi and low
compression ratio
2-12
2200LZJE-HO-C6-N_2013.12.
Discharge
Compression
Discharge port opened
Rotor rotation angle
Discharge
Compression
Discharge port opened
Rotor rotation angle
2.5 Mechanisms