11
Instruction Manual
2.4 CONTROLS AND INDICATORS
Controls
– Safety valve (SV).
Releases air when the air receiver pressure is 30 bar(e) (ORV),
34 bar(e) (ORX).
– Check valve (CV).
Prevents blow-back of compressed air when the compressor is
stopped.
– By-pass valve (BV).
Protects the LP compressor element (CEL) in case the interstage
pressure should rise above the working pressure.
– Minimum pressure valve (MPV).
Prevents the air receiver pressure from dropping below 15 bar(e)
(ORV), 18 bar(e) (ORX).
– Blow-down valve (BDV).
Depressurizes the air receiver (AR).
– Oil filter by-pass valve.
Opens when the pressure drop over the oil filter (OF) is above
normal due to clogging of the element. The oil then by-passes the
element without being filtered. For this reason, it is imperative to
replace the oil filter at regular intervals.
– Oil stop valve (OSV).
Lets the oil run from the air receiver (AR) to the compressor
element. Opens when the unit is started. Closes when the unit is
stopped to prevent the compressor element from flooding with
oil.
– Flow restrictor (FR).
Manages the oil flow from the air receiver/oil separator (AR/OS)
to the compressor element, to minimize the leaking of air to the
compressor element.
– Thermostatic by-pass valve (TBV).
Opens when oil temperature is above 70 °C. Oil then flows
through the oil cooler (OC).
– Overpressure valve (OV).
Releases air when the pressure in the gear casing is too high.
– Start prevention switch.
The switch prevents the compressor from starting when the
receiver pressure is above 1.5 bar(e).
Indicators
– Temperature gauge (TG
1
).
Indicates the air outlet temperature of the LP compressor element
(CEL).
– Temperature gauge (TG
2
).
Indicates the air outlet temperature of the HP compressor
element (CEH).
– Interstage pressure gauge (PG
1
).
Indicates the interstage pressure, i.e. the pressure between the LP
compressor element (CEL) and the HP compressor element
(CEH).
– Working pressure gauge (PG
2
).
Indicates the air receiver pressure.
– Sight glass (SG).
Indicates the oil level in the air receiver.
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