NASH liquid ring vacuum pumps are a reliable and durable solution for challenging process applications. Our liquid ring vacuum pump design was the first-of-its-kind at the turn of the 20th century and has been an industry leader ever since.

Through our ongoing commitment to innovation, product research, and development, Nash continues to introduce quality liquid ring vacuum pumps and product upgrades that meet the rigors of the most demanding applications while reducing the total cost of ownership.

Review our extensive product portfolio and discover the NASH liquid ring vacuum pump best suited for your process.

Learn About Our Liquid Ring Vacuum Pumps

Small Capacity

Medium Capacity

Large Capacity

Two Stage

Proven Performance

Vacuum Pump Performance Chart
*Performance data is for illustrative purposes. Please consult with a Nash Engineer or Sales Representative for pump sizing and specific performance data.

Reliable Liquid Ring Technology

The working principle of a liquid ring pump is based around a pump body and an eccentric rotor. As the rotor spins, the seal liquid inside the pump forms a rotating "liquid ring" on the inner surface of the body. NASH liquid ring vacuum pumps feature three product sizes including small capacity, medium capacity, and large capacity liquid ring pumps.

Small Capacity Pumps

(Vacuum levels up to 29in. HgA, 1.5 HP to 10 HP)

NASH small capacity liquid ring vacuum pumps feature monoblock or lantern designs. These designs deliver the benefits of a simple, compact, and economical installation. Our small capacity liquid ring pumps are available in a variety of materials including cast iron and stainless steel and are ideal for use in a vast range of general industrial processes. 

Medium Capacity Pumps

(Vacuum levels up to 28in. HgA, 10 HP to 200 HP)

NASH medium capacity liquid ring vacuum pumps offer a highly powerful range of small to medium size single stage vacuum pumps for use in diverse industries including oil & gas, general industrial, and chemical.

Available in cast iron for less aggressive applications, and stainless steel for hostile applications and environments.

Large Capacity Pumps

(Vacuum levels up to 25in. HgA, above 200 HP)

NASH medium to large capacity single stage vacuum pumps are ideal for demanding applications in extremely tough conditions. These heavy-duty pumps are able to serve a wide range of applications, which can typically include dewatering in the paper industry and vacuum filtering in mineral ore processing. Our large capacity pumps are available in a variety of materials including stainless steel, cast iron with some models featuring a polyisoprene lining.

Two Stage Liquid Ring Vacuum Pumps

(Vacuum levels to 0.8in. Hg abs.)

NASH two stage liquid ring vacuum pumps are ideal for a variety of industrial applications and may be combined with ejectors or boosters to form hybrid packages, allowing higher vacuum levels. Nash offers TC two stage liquid ring vacuum pumps, available in ductile iron and stainless steel, and the AT two stage liquid ring vacuum pumps, available in cast iron. Both the TC and AT two stage vacuum pumps feature NASH conical porting.

Characteristics Of Liquid Ring Vacuum Pumps

  • Accepts Carryover - Soft solids, moisture, slugs, chemicals, and more will not harm the pump but are washed out through the pump discharge.
  • Cool & Quiet Operation - The pump runs cool due to the circulation of the sealing water inside the pump.

Vectra XL Liquid Ring Vacuum Pump Compressor 50 to 8,900 m3/h (29 to 5,238 CFM)
  • Continuous Operation for Any Process - The pump can operate constantly and continuously at any vacuum level up to 1in. HgA.
  • Easy Maintenance and Longer Pump Life - Our pump only has one moving part so there is less wear and simple maintenance, making our pumps more affordable.
  • Environmentally Safe - Our pumps do not require oil changes, filters, oil-pans, condensers, etc. so operating facilities run clean and free of any oil contamination and discharge.

Highest Standards

Nash is committed to the highest standards in production and safety. We have many ISO certificates, issued to our facilities worldwide and continue to improve our quality by optimizing internal processes.

Downloads For Liquid Ring Vacuum Pumps