FScurtis SE Series, Руководство оператора, Страница: 17 / 42

Curtis-Toledo Rotary Compressor
CAP862
Operations and Maintenance Manual
Chapter 4 Page 3
(8). After Cooler
This is the cooler for air-cooled series compressors. The compressed air is being cooled
by fan blowing air through the radiator. Generally discharge air temperature is 10-15°F
above ambient temperature.
Environment is a crucial factor for air-cooled type air
compressors; please install in a well-ventilated area.
(9). Moisture Separator
It is a cyclone type separator. It will drain condensate
,
water, oil drop, and particles from
cooled air.
(10). Auto Drain Valve
Collects and drains out condensate water automatically from water separator.
2. Oil flow path (refer to the flow chart of each type)
(1). Description of oil injected flow chart
Pressure in the separator pushes oil into oil cooler and then passes through the oil filter for
filtration after being cooled down. Oil flow is further separated into 2 directions: one goes
into compression chamber from the bottom of air end. The other goes to the bearing on the
discharge side for lubrication.
Then the compressed air and oil mixture is delivered to the
separator tank again to separate most of the oil from the oil separator (1
st
Stage) while the
rest of the oil mist goes through oil separator (2
nd
Stage) for further separation. Finally
passes through minimum pressure valve into after cooler and is discharged.
(2). Volume of oil injection
The purpose of oil injection in an oil flooded screw compressor is to dissipate the heat
away in the process of air compression.
(3). Function of parts on the oil flow system
A. Oil Cooler
The function of oil cooler is the same as air cooler. Environment is a crucial factor for
air-cooled type compressor; please install unit in a well-ventilated area. Clean the dust on
the fins of radiator periodically with compressed air or with solvent.
B. Oil Filter
Oil filters help get rid of metallic particles, sludge … etc. from compressor oil in order to
protect bearings and rotors. Once the first 500 hours of operation is reached, please follow
the instructions for replacement. Failure to do so may result in lack of oil which will lead to
high discharge temperature and shorter bearing life.
C. Oil Separator
a. Function
The element of the oil separator is made by multiple layers of filtration materials. Most of
the oil mist comprised in the compressed air could be filtered out through a separator. The
life span of the oil separator is affected greatly by lubricant grade and condition. Use
CURTIS R/S 8000 in order to maintain your warranty. There is a pressure relief valve
(safety valve) and a minimum pressure valve at the oil separator outlet. Compressed air is
led through the oil separator, to the minimum pressure valve, and then to the after cooler.
Oil collected by the separator will return to the suction side of the air end to avoid oil carry
over.
b. Requirement of oil separator replacement
1. Oil carry-over increases.
2. Warning on controllerl indicates replacement is required.
3. Running current increases.