Data sheet
Energy Recovery Device / iSave 21-40
3
521B1116 / DKCFN.PD.003.A4.02 / 01.2012
1. General information
The iSave 21-40 consists of an isobaric pressure
exchanger (PE), a high pressure positive displace-
ment booster pump (BP) and an electric motor.
The isobaric pressure exchangers are based on
the technology used in the Danfoss APP pumps,
and the high-pressure booster pumps are based
on the vane pump principle enabling a very light
and compact design. The design of iSave 21-40
ensures lubrication of the moving parts by the
fluid itself.
All parts included in the iSave 21-40 are designed
to provide long service life with a constant high
efficiency and minimum service required.
The vane pumps are fixed displacement pumps
in which the flow is proportional to the number
of revolutions of the driving shaft – enabling flow
control.
The electric motor provides speed control of
both the pressure exchanger and the high-
pressure booster pump on the same shaft – pre-
venting over spin / over flushing.
The iSaves need a VFD that allows the motor to
apply a constant torque from low speed to
maximum speed.
2. Benefits
• One of the smallest and lightest energy
recovery devices on the market
• Few components
• High efficiency
• No need for high-pressure flow meters
• No expensive high-pressure mechanical seal
• No risk of over spin / over flushing
• Easy modular service
• All parts of the device are made of high
corrosion resistant materials eg super-duplex
Summary of Contents for iSave 21
Page 5: ...User manual iSave 21 5 180R9221 521B1174 DKCFN PS 003 A1 02 1 CE Declaration of conformity...
Page 32: ...User manual iSave 21 32 180R9221 521B1174 DKCFN PS 003 A1 02...
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Page 43: ...User manual iSave 21 43 180R9221 521B1174 DKCFN PS 003 A1 02 10 3 Data sheet...
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Page 59: ...User manual iSave 21 59 180R9221 521B1174 DKCFN PS 003 A1 02 10 4 iSave part list...
Page 60: ...User manual iSave 21 60 180R9221 521B1174 DKCFN PS 003 A1 02...
Page 61: ...isave danfoss com iSave 21 Parts list 180R9209 DKCFN PC 003 A2 02 Parts list...
Page 66: ...Parts list iSave 21 Parts list 6 180R9209 DKCFN PC 003 A2 02 03 2011 Exploded view Vane pump...
Page 68: ...Parts list iSave 21 Parts list 8 180R9209 DKCFN PC 003 A2 02 03 2011 Exploded view iSave...
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Page 71: ...User manual iSave 21 71 180R9221 521B1174 DKCFN PS 003 A1 02 10 5 iSave overload protection...
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