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Compressor Regulating System (Load Condition)
Fig. 2.4 Compressor Regulating System
AFe Air Filter Engine
AFc Air Filter Compressor
AR Air Receiver
AV Air Outlet Valve
BDV Blow Down Valve
CE Compressor Element
CP Control Panel
CV Check Valve
DB Drive Belt
DP Drain Plug
E Engine
EP Exhaust Pipe
F Cooling Fan
FC1 Fuel Filler Cap
FP Compressor Oil Filling
Plug
FR Flow Restrictor
G1 Alternator
LV Loading Valve
MPV Minimum Pressure
Nozzle
OC Oil Cooler
OFe Oil Filter Engine
OFc Oil Filter Compressor
OLG Oil Level Gauge
OS Oil Separator
PG Pressure Gauge
RV Regulating Valve
SL Scavenge Line
SR Speed Regulator
SV Safety Valve
TS Temperature Switch
UA Unloader Assembly
UV Unloader Valve
VH Vent Hole
VIe Vacuum Indicator
Engine
VIc Vacuum Indicator
Compressor
2.4 Air Flow (see Fig. 2.4)
The system comprises:
AF Air filter
AR/OS Air receiver/oil separator
CE Compressor element
UA/UV Unloader assembly with unloader valve
BDV Blow-down valve
MPV Minimum pressure valve
LV Loading Valve
Air drawn through the airfilter (AF) into the compressor
element (CE) is compressed. At the element outlet,
compressed air and oil pass into the air receiver/oil
separator (AR/OS).
The check valve prevents blow-back of compressed air when
the compressor is stopped. In the air receiver/oil separator
(AR/OS), most of the oil is removed from the air/oil mixture: the
remaining oil is removed by the separator element.
The oil collects in the receiver and on the bottom of the
separator element.
The air leaves the receiver via the minimum pressure valve
(MPV) which prevents the receiver pressure from dropping
below the minimum working pressure, even when the air outlet
valves are open. This ensures adequate oil injection and
prevents oil consumption.
A temperature switch (TS) and a working pressure gauge (PG)
are comprised in the system.
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