Atlas Copco XAS97 Dd

12
XAS97 Dd
C
OMPRESSOR
R
EGULATING
S
YSTEM
Fig. 2.3
2.5 A
IR FLOW
(
SEE
F
IG
. 2.3)
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
FN Flow nozzle
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 (CV) 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 a flow nozzle (FN) which prevents the
receiver pressure from dropping below the minimum working
pressure (specified in section 8.3), 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.
A blow-down valve (BDV) is fitted in the unloader assembly to
automatically depressurise the air receiver (AR) when the
compressor is stopped.
VI
E
AF
SR
F
TS
DP
CE
OF
CV
BDV
UA
UV
VH
SL
FP
SL
OLG
DP
FN
AOV
AR
OS
PG
RV
FR SV
C
VV
DP
OC
CE
AF Air Filter
AR Air Receiver
AOV Air Outlet Valves
BDV Blow Down Valve
C Coupling
CE Compressor Element
CV Check Valve
DP Drain Plug
E Engine
FFan
FP Filler Plug
FR Flow Restrictor
FN Flow nozzle
OC
CE
Oil Cooler
(compressor element)
OF Oil Filter
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
VI Vacuum Indicator
VV Vacuator Valve