13-18-601 Page 60
SECTION 10
INLET CONTROL VALVE
INLET CONTROL VALVE
– This device is located at the intake flange of the compressor, and allows the
compressor to remain pressurized and ready for quick response to air demand when the latter is not
running.
During compressor operation, the underside of the poppet is vented to atmosphere via a 3-way solenoid
valve, allowing the poppet to fall [open] and feed fresh air to the compressor inlet. An internal self-
actuated blow-off valve assist in the fast venting of the air signal trapped below the poppet During
stopped operation modes (e.g., commanded from keypad or initiated by protective shutdown), the 3-way
solenoid valve feeds an air signal to the underside of the poppet, forcing it upward [closed] and block off
the compressor intake. The internal blow-off valve is also forced closed by the incoming air signal.
Figure 10-1 – INLET CONTROL VALVE
Inlet Control Valve (Body) Inspection -
The valve does not require maintenance or lubrication. If air/oil
leaks develop across the valve disc during pressurized conditions (e.g., machine stopped), valve seals
should be inspected for wear and tear signs:
8. Be sure the unit is completely off and oil sump is depressurized.
9. Disconnect, lockout and tagout power supply to the compressor package.
10. Close (when provided) valve isolating compressor package from air system.
11. Identify (by position) each tube connected to the valve body and remove.
12. Remove four bolts (Item 13) securing valve body to compressor body and remove valve.
13. Inspect poppet seal [o-ring] (Item 5) for wear and tear. Replace, if necessary.
