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Dolphin LB 3809 / 4409 A

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

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

The Dolphin LB 3809 / 4409 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 Turkey):
Get in contact or +90 (0)216 3100573

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 3809/4409 A
Dolphin LB 3809/4409 A
Pumping speed

Air at 20 °C. Tolerance: ± 10%

50 Hz 60 Hz
Pumping speed
Technical data Dolphin LB 3809 A Dolphin LB 4409 A
Nominal pumping speed 2500 - 3800 m3/h 2600 - 4400 m3/h
Ultimate pressure 33 hPa (mbar) 33 hPa (mbar)
Nominal motor rating 90 - 150 kW 90 - 185 kW
Nominal motor speed 465 - 700 min-1 465 - 700 min-1
Noise level (ISO 2151) 85 dB(A) 85 dB(A)
Weight approx. 2200 kg 2340 kg
Dimensions (L x W x H) 2025 x 950 x 1410 mm 2150 x 950 x 1410 mm
Gas inlet / outlet DN 200 KF / DN 200 KF DN 200 KF / DN 200 KF

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 3809/4409 A
Dolphin LB 3809/4409 A
Pumping speed

Air at 20 °C. Tolerance: ± 10%

50 Hz
60 Hz
Pumping speed
Technical data Dolphin LB 3809 A Dolphin LB 4409 A
Nominal pumping speed 2500 - 3800 m3/h 2600 - 4400 m3/h
Ultimate pressure 33 hPa (mbar) 33 hPa (mbar)
Nominal motor rating 90 - 150 kW 90 - 185 kW
Nominal motor speed 465 - 700 min-1 465 - 700 min-1
Noise level (ISO 2151) 85 dB(A) 85 dB(A)
Weight approx. 2200 kg 2340 kg
Dimensions (L x W x H) 2025 x 950 x 1410 mm 2150 x 950 x 1410 mm
Gas inlet / outlet DN 200 KF / DN 200 KF DN 200 KF / DN 200 KF

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 Turkey):
+90 (0)216 3100573 Get in contact

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