Sumitomo F-20L, Operating Manual, Page: 13 / 56

PRINCIPLES of OPERATION
9
Figure 1 Compressor Flow Diagram
Key
TSG Helium discharge temperature switch
ARV Atmospheric relief valve
IRV Internal relief valve
SV Solenoid valve
PG Pressure gauge
TSO Oil discharge temperature switch
TSW
o
Water-out temperature switch
The compressor continuously draws low-pressure helium from the system return line. It
compresses, cools and cleans the gas, then delivers it through the system gas supply line to the
cold head. See Figure 1.