Flow diagram of compressor with energy recovery system
Reference Designation Reference Designation
BV2 Thermostatic bypass valve of ER
unit
OF Oil filter
HE Oil/water heat exchanger (ER
unit)
AR Oil separator vessel
E Compressor element BV1 Thermostatic bypass valve in oil
filter housing
Co Oil cooler (compressor) Ca Aftercooler (compressor)
1 Water inlet 2 Water outlet
BV2 starts closing the bypass line over the heat exchanger (HE) at the lower limit of its
temperature range. At the upper limit of its temperature range, the bypass line is completely
closed and all the oil flows through the ER heat exchanger.
On compressors versions with a maximum pressure lower than 13 bar (175 psi), BV2 starts
opening at 40 ˚C (104 ˚F) and is completely open at 55 ˚C (131 ˚F).
On compressors with a maximal pressure of 13 bar (175 psi), BV2 starts opening at 60 ˚C (140
˚F) and is completely open at 75 ˚C (167 ˚F).
The housing of BV2 is provided with a special wheel (V1), allowing to control the energy recovery
system.
As can be seen on the ER label, the ER unit is integrated in the oil circuit and will recover energy
when the wheel is completely turned in clockwise.
When the wheel is turned out anticlockwise, the heat exchanger (HE) is bypassed and no energy
will be recovered.
Instruction book
2920 7109 51 109
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