iSave

iSave 21 Plus / iSave 40

The iSave21 Plus and iSave40 are compact systems comprising an isobaric pressure exchanger, a high-pressure booster pump, 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 Plus and iSave 40 ensures lubrication of the moving parts by the fluid itself.

All parts included in the iSave 21 Plus and iSave 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
– preventing overspin/overflushing.

The iSaves need a VFD that allows the motor to apply a constant torque from low speed to maximum speed.

iSave 50-70

Energy Recovery Devices (ERD) are used in reverse osmosis (RO) systems to recycle the energy held in discharged brine from the membranes. This, iSave 50 and iSave 70 are designed for use with low viscosity and corrosive fluid such as sea water.

The Danfoss iSave Energy Recovery Devices all consist of an isobaric pressure exchanger and a positive displacement pump combined into one compact unit. The high-pressure booster pump is based on the vane pump principle enabling a very light and compact design. The vane pumps are fixed displacement pumps in which the flow is proportional to the number of revolutions (rpm) of the driving shaft – enabling flow control. Speed control is made by a VFD. The iSave design ensures lubrication of the moving parts by the fluid itself.

All parts included in the iSave 50 & 70 are designed to provide long service life with a constant high efficiency and minimum service required.

Unlike a centrifugal pump, it produces a similar flow at a given speed no matter what discharge pressure.