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Dolphin LX 0030 / 0055 B

Busch LX series liquid ring vacuum pumps are of a compact, motor-mounted design; ideal for a wide range of wet or corrosive process applications. The small footprint and minimal connections make them easy to install or adapt into any system, machine or process where a liquid ring pump is preferred. All pumps are of a single-stage, high-efficiency, variable port design that provides end vacuum capability comparable to most two-stage pumps. Quiet running and requiring minimal maintenance, LX pumps are an economical alternative to traditional close-coupled, separate-drive or base-mounted liquid ring configurations.

• Ultimate pressure of 25 Torr (29”Hg Vac)
• Compact, singlestage design
• Low service liquid requirements
• Rugged and reliable
• Only one moving part
• Low maintenance
• Low vibration and noise levels
• Low heat emission

Standard Equipment
All Models
• TEFC motor with mounting feet
• NPT inlet/outlet connections
• Variable discharge port
• Mechanical shaft seal
• Liquid drain port
B Models Only
• Cast iron housing, with 316 stainless steel impeller
• Replaceable port plate
• O-ring sealed  
A Models Only
• Cast iron housing, with bronze impeller
• Access cover for easy internal inspections

• Chemical
• Pharmaceutical
• Medical
• Laboratory
• Food processing
• Plastics
• Environmental
• Renewables
• Paper industry
• Packaging
• Distillation
• Solvent recovery
• De-aerating
• Filtration

Dolphin LX – Robust and compact. Ideal for difficult applications.

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


  • Air/water discharge separators
  • Service liquid line components
  • Check valves
  • Vacuum relief valves
  • Liquid separators
  • Inlet filters
  • Knock-out pots
  • Control valves
  • Gauges
  • Transmitters and switches
  • Motor starters
  • Vacuum receivers

Dolphin LX 0030/0055 B
Dolphin LX 0030/0055 B
Pumping speed

Air at 70 ºF. Tolerance: ± 10%

60 Hz
Pumping speed
Technical data Dolphin LX 0030 B Dolphin LX 0055 B
Nominal pumping speed ACFM 60 Hz 18 34
Ultmate pressure Torr 60 Hz 25 25
Nominal motor rating kW (HP) 60 Hz 1.1 (1.5) 2.2 (3)
Nominal motor speed RPM 60 Hz 3450 3450
Noise level (ISO 2151) dB(A) 60 Hz 70 70
Weight approx. Lbs. 55 73
Dimensions (L x W x H) inches 18 3/8 x 9 ½ x 9 13/16 21 5/8 x 9 ½ x 9 13/16
Gas inlet / outlet (NPT) inches 1" / 1" 1" / 1"


Dolphin LX 0030 / 0055 B

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