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Dolphin LA 3809 / 5109 A

Our Dolphin LA range of liquid ring vacuum pumps are well suited for wet and corrosive applications. They combine the benefits of high efficiency from a compact rugged machine, and reduced running cost from a competitive product.


  • Suction capacity from 35 cfm to over 3000 cfm
  • Ultimate pressure to 100 torr (26 HgV)
  • Available in a wide range of materials
  • Minimal moving/contacting parts allowing ease of service and
  • Single mechanical seals standard
  • Low vibration and noise level
  • Reliability
  • ANSI flanges and NEMA motors
  • Some models are directly interchangeable with other brands
  • Low heat emission
  • Oil free discharge

Dolphin – robust and compact. Ideal for difficult applications.

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Contact us directly (Busch United States):
+1 757 463 7800 Get in contact

Technical specifications
Liquid ring pumps operate with only one moving part, the impeller shaft assembly. The impeller is mounted eccentrically relative to it’s casing. The liquid ring is formed by the service liquid (normally water) rotating concentrically in it’s casing. Process gas enters through the suction port, travels between the impeller blades and is compressed prior to exhausting through the discharge port along with a quantity of service liquid.

Dolphin LA 3809/5109 A
Dolphin LA 3809/5109 A
Pumping speed

Air at 70 ºF. Tolerance: ± 10%

60 Hz
Pumping speed
Technical data Dolphin LA 3809 A Dolphin LA 5109 A
Nominal pumping speed ACFM 60 Hz 2304 3096
Ultimate pressure Torr 60 Hz 100 100
Nominal motor rating HP 60 Hz 200 200
Nominal motor speed RPM 60 Hz 700 700
Noise level (ISO 2151) dB(A) 60 Hz 85 85
Weight approx. Lbs. 4299 4519
Dimensions (L x W x H) inches 65 9/16 x 37 ½ x 55 1/8 70 ½ x 37 ½ x 55 1/8
Gas inlet / outlet (ANSI) inches 10" / 10" 10" / 10"

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