Vacuum Pumps

Vacuum Pumps

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General Information

Liquid ring vacuum pumps are rotary displacement pumps of simple design and durable construction found in a wide range of applications in many fields. They have the following features:

  • Reliable, low maintenance, and safe operation
  • Low noise and vibration
  • Operate at virtually constant temperature allowing safe cool compression of flammable vapors and gases
  • Capable of handling almost any gas and/or vapor
  • Saturated gases can be pumped without difficulty
  • Liquid carryover can be handled
  • No sliding contact
  • Can deliver oil free gases
  • Available in a variety of materials to handle most applications


Liquid ring vacuum pumps are found in operations such as drying, distilling, condensing, evaporating, flushing, handling corrosive and explosive gases, evacuating systems, and compressing oil free air for medical breathing and instrument air amongst others.

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How It Works

A liquid ring vacuum pump has a shaft mounted impeller positioned eccentrically to the centerline of a round pump body. The centrifugal action of the rotating impeller forces the service liquid out towards the periphery of the pump body forming the liquid ring.

When the pumping action starts, the gas mixture being handled is fed to the impeller through the suction port in the intermediate plate, causing a vacuum at the pump suction. The gas mixture fills the impeller cavity between the inside diameter of the liquid ring and the root of the impeller blade.

As the impeller rotates, the impeller blade immersion in the liquid ring increases reducing the volume between the liquid ring and the root of the impeller blade. The result is the compression of the gas mixture until it reaches the discharge port, located in the intermediate plate. The gas mixture exits through the discharge port.

During the compression cycle heat is being imparted to the liquid ring. In order to maintain a temperature below the vapor point of the service liquid, cooling must be applied. Cooling is achieved by continuously adding a cool supply of service liquid to the liquid ring.

The amount of service liquid added is equal to that discharged through the discharge port together with the compressed gas mixture. The gas mixture and service liquid is eventually passed through the pump discharge for separation.

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Kinney Vacuum Pumps

Tuthill Vacuum and Blower Systems (TVBS) manufacture Kinney vacuum pumps for every industry and application, from agriculture to the medical field.  DL Thurrott, Inc. can provide standard packages and custom solutions for our customers. 

Kinney Vacuum has been a leader in the vacuum pump industry for 100 years. In 1926 Kinney developed a vacuum pump for use in large commercial operations. These pumps helped change the face of America by making it possible to mass-produce light bulbs, radio tubes, equipment for refrigeration, air conditioning and a host of other products, all at high speed.

With its Kinney Vacuum line, Tuthill Vacuum and Blower Systems (TVBS) serves industries as diverse as plastics, refrigeration, automobiles, jewelry, and semiconductors. In addition, TVBS targets specific industries such as chemicals, pharmaceuticals, food packaging and vacuum furnaces where the ruggedness and durability of Kinney products are highly valued.

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