Gardner Denver AirSmart VS135A, Operating And Service Manual, Page: 69 / 82

13-18-607 Page 68
SECTION 10
INLET CONTROL VALVE
INLET CONTROL VALVE – This device is located at the intake flange of the compressor. During
compressor stoppage, planned or accidental (e.g., power failure), it blocks off the compressor intake and
allows it to remain pressurized and ready for quick re-start. A spring-loaded check feature is provided as
added insurance against air or oil backflow.
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
– the spring loaded
check feature is pushed open by a very small pressure differential resulting from the incoming air stream.
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),
compressing the spring loaded check feature and blocking-off the compressor intake.
Refer to Part List 13-18-505 for spare parts.
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:
1. Be sure the unit is completely off and oil sump is depressurized.
2. Disconnect, lockout and tagout power supply to the compressor package.
3. Close (when provided) valve isolating compressor package from air system.