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DOLPHIN LB 0857 - 1757 A

Dolphin LB – Robust and flexible. Ideal for demanding applications.

Dolphin LB – Robust and flexible. Ideal for demanding applications.

The Dolphin LB 0857 - 1757 A belong to the Busch product family of proven Dolphin Liquid Ring vacuum pumps. You will find more information on advantages, technology, accessories and spare parts, applications as well as a complete product overview on our Dolphin LB series type page.

Series Type Page DOLPHIN LB
Want to know more?
Contact us directly (Busch Germany):
Get in contact or +49 (0)7622 681-0

Dolphin LB – Robust and flexible. Ideal for demanding applications.

Dolphin LB – Robust and flexible. Ideal for demanding applications.


Technical Specifications

Dolphin LB is a series of two-stage liquid ring vacuum pumps. An eccentrically mounted impeller rotates in a housing partially filled with operating fluid. The impeller blades dip into the fluid, and the centrifugal force exerted by their rotation forms a so-called liquid ring within the housing.


The pumped medium is transported in the spaces between the blades and the liquid ring. The eccentric rotation of the impeller alters the volume of these spaces, causing gas to be drawn in, compressed and expelled. Operation as a compressor is possible up to 2.0 bar(g).

Dimensional Drawing DOLPHIN LB 0857 - 1757 A
DOLPHIN LB 0857 - 1757 A
Pumping speed

Dry air at 20 °C. Tolerance: - 10%, in accordance with HEI and Pneurop 6612

50 Hz 60 Hz
Pumping speed
Technical data DOLPHIN LB 0857 A DOLPHIN LB 1207 A DOLPHIN LB 1507 A DOLPHIN LB 1757 A
Nominal pumping speed 850 m³/h 1200 m³/h 1500 m³/h 1750 m³/h
Ultimate pressure 33 hPa (mbar) 33 hPa (mbar) 33 hPa (mbar) 33 hPa (mbar)
Max. overpressure 2 bar(g) 2 bar(g) 2 bar(g) 2 bar(g)
Nominal motor rating 30 kW 37 kW 45 kW 75 kW
Nominal motor speed 960 min-1 960 min-1 960 min-1 960 min-1
Noise level (ISO 2151) 76 dB(A) 76 dB(A) 76 dB(A) 76 dB(A)
Weight approx. 510 kg 600 kg 685 kg 770 kg
Dimensions (L x W x H) (1096-1282) x 610 x 750 mm (1246-1432) x 610 x 750 mm (1346-1532) x 610 x 750 mm (1496 - 1682) x 610 x 750 mm
Gas inlet / outlet DN 100 PN 10 DN 100 PN 10 DN 100 PN 10 DN 100 PN 10

Technical Specifications

Dolphin LB is a series of two-stage liquid ring vacuum pumps. An eccentrically mounted impeller rotates in a housing partially filled with operating fluid. The impeller blades dip into the fluid, and the centrifugal force exerted by their rotation forms a so-called liquid ring within the housing.


The pumped medium is transported in the spaces between the blades and the liquid ring. The eccentric rotation of the impeller alters the volume of these spaces, causing gas to be drawn in, compressed and expelled. Operation as a compressor is possible up to 2.0 bar(g).

Dimensional Drawing
DOLPHIN LB 0857 - 1757 A
DOLPHIN LB 0857 - 1757 A
Pumping speed

Dry air at 20 °C. Tolerance: - 10%, in accordance with HEI and Pneurop 6612

50 Hz
60 Hz
Pumping speed
Technical data DOLPHIN LB 0857 A DOLPHIN LB 1207 A DOLPHIN LB 1507 A DOLPHIN LB 1757 A
Nominal pumping speed 850 m³/h 1200 m³/h 1500 m³/h 1750 m³/h
Ultimate pressure 33 hPa (mbar) 33 hPa (mbar) 33 hPa (mbar) 33 hPa (mbar)
Max. overpressure 2 bar(g) 2 bar(g) 2 bar(g) 2 bar(g)
Nominal motor rating 30 kW 37 kW 45 kW 75 kW
Nominal motor speed 960 min-1 960 min-1 960 min-1 960 min-1
Noise level (ISO 2151) 76 dB(A) 76 dB(A) 76 dB(A) 76 dB(A)
Weight approx. 510 kg 600 kg 685 kg 770 kg
Dimensions (L x W x H) (1096-1282) x 610 x 750 mm (1246-1432) x 610 x 750 mm (1346-1532) x 610 x 750 mm (1496 - 1682) x 610 x 750 mm
Gas inlet / outlet DN 100 PN 10 DN 100 PN 10 DN 100 PN 10 DN 100 PN 10

Accessories and Spare Parts

  • Modular pumpsets, configured for partial or total recirculation of the operating fluid
  • Liquid separator
  • Cavitation protection
  • Heat exchanger
  • Gas ejector
  • Wide selection of motors
  • Non-return valves
  • Vacuum relief valves

Want to know more?
Contact us directly (Busch Germany):
+49 (0)7622 681-0 Get in contact

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