SECTION 2 1100E, 1500E, 1800E USER MANUAL
 19
2.7 AIR INLET SYSTEM, 
FUNCTIONAL DESCRIPTION 
Refer to Figure 2-5. The compressor inlet system
consists of a dry-type air filter, a restriction gauge
and an air inlet valve. The poppet-type modulating air
inlet valve directly controls the amount of air intake to
the compressor in response to the operation of the
pressure regulator (see Modulating Mode—100 to
110 PSIG (6.9 to 7.6 BAR) on page 17). The inlet
valve also acts as a check valve, thus preventing
reverse rotation when the compressor is shut down. 
 WARNING
“The Plastic Pipe Institute recommends 
against the use of thermoplastic pipe to 
transport compressed air or other com-
pressed gases in exposed above ground 
locations, e.g. in exposed plant piping.” (I) 
Sullube should not be used with PVC piping 
systems. It may affect the bond at cemented 
joints. Certain other plastic materials may 
also be affected. 
(I) Plastic Pipe Institute, Recommendation 
B, Adopted January 19, 1972.
Figure 2-5: Air Inlet System
1. Air Inlet Filter 2. To Inlet Housing