Are you looking for liquid ring vacuum pump manufacturers that can handle wet gases and condensable vapors? Do you need a pump matched to your operating pressure, available cooling water and process medium? Or are you comparing a standalone pump with a complete vacuum system?
If the answer is yes, then the global liquid ring vacuum pump market is a useful place to start. Manufacturers offer different combinations of pump designs, application engineering and packaged systems. Below, we present 10 manufacturers to help you build a practical purchasing shortlist.
This selection is arranged as a purchasing guide, rather than a ranking based on market share or independently measured performance. Compare the proposed model and system scope against your duty conditions before choosing a supplier.
- NASH
- DV VACUUM
- Busch Vacuum Solutions
- Pompetravaini
- Samson Pumps
- Speck Pumps / Speck Industries
- KENFLO
- Shandong Boke Vacuum Technology
- Shandong Nade Vacuum Technology
- Graham Manufacturing
1. NASH
Company website overview.
Website: https://www.nashpumps.com/
Headquarters / Supply Model: Industrial vacuum equipment manufacturer and engineered-system provider with regional sales and support.
Core Products / Technologies: Liquid ring vacuum pumps, liquid ring compressors, ejectors and packaged process vacuum systems.
Why Consider NASH: NASH brings liquid ring pumps together with ejector and process-system engineering. This makes it relevant when a purchase involves the interaction between the pump, condensers and the wider plant rather than a bare-pump replacement alone.
Best Suited For: Process plants in chemicals, pulp and paper, power generation and other wet-gas services that need a coordinated vacuum package.
Before Purchasing: Define the actual inlet gas and vapor load, required suction pressure and seal-liquid conditions. For a replacement, request dimensional drawings and a duty-point performance comparison instead of relying on a similar nominal pump size.
2. DV VACUUM
Company website overview.
Website: https://www.dvvacuum.com/
Headquarters / Supply Model: China-based vacuum pump manufacturer offering in-house pump production and custom vacuum system engineering.
Core Products / Technologies: DVL, DVE and DLRC liquid ring pump series, liquid ring vacuum systems and Roots–liquid ring configurations.
Why Consider DV VACUUM: DV VACUUM is worth shortlisting when wet-process pumping and system integration need to be discussed together. Its liquid ring range is presented for wet and condensable gas duties, while its broader system portfolio allows buyers to discuss a pump-only supply or an integrated package with the same manufacturer. Explore the liquid ring range.
Best Suited For: Chemical, pharmaceutical, food and environmental projects seeking a China-based manufacturing partner for a specified process duty.
Before Purchasing: Ask DV VACUUM to identify the proposed series and model, supply a curve corrected for your seal-liquid temperature, and state the scope of separators, heat exchangers and controls. Confirm wetted materials and seals for the actual gas mixture; request model-specific documentation for any hazardous-area requirement.
3. Busch Vacuum Solutions
Company website overview.
Website: https://www.buschvacuum.com/
Headquarters / Supply Model: International vacuum equipment manufacturer offering pumps, systems and service.
Core Products / Technologies: DOLPHIN liquid ring vacuum pumps and compressors, including LX, VX and LM/LT product families.
Why Consider Busch Vacuum Solutions: The DOLPHIN portfolio lets buyers compare individual pumps with packaged units within an established vacuum brand. Its official range specifically addresses saturated gases and vapors, making it a relevant starting point for wet-process applications. Review the DOLPHIN range.
Best Suited For: Buyers comparing a branded pump or package and the associated service arrangements for an industrial site.
Before Purchasing: Check the exact DOLPHIN configuration, once-through or recirculating liquid circuit, and the local service scope. Ask for the operating envelope at your inlet conditions and confirm which auxiliary equipment is included.
4. Pompetravaini
Company website overview.
Website: https://www.pompetravaini.com/
Headquarters / Supply Model: Italy-based pump manufacturer offering vacuum equipment and engineered vacuum systems.
Core Products / Technologies: Liquid ring vacuum pumps and engineered vacuum systems alongside a separate centrifugal pump portfolio.
Why Consider Pompetravaini: Pompetravaini is a relevant option for buyers sourcing from an Italian pump manufacturer with both vacuum-pump and system offerings. Its distinct product categories help procurement teams separate process-liquid transfer equipment from vacuum generation.
Best Suited For: European and international industrial projects that require a liquid ring pump or an engineered vacuum package.
Before Purchasing: Specify that the enquiry concerns liquid ring vacuum service. Request the proposed vacuum pump series, stage arrangement, seal-liquid circuit and performance curve; the company also sells centrifugal pumps, which serve a different duty.
5. Samson Pumps
Company website overview.
Website: https://samson-pumps.com/
Headquarters / Supply Model: Liquid ring pump and solution manufacturer with a focus on application-specific equipment.
Core Products / Technologies: Liquid ring vacuum solutions for fish handling and vacuum trucks, with associated application design support.
Why Consider Samson Pumps: Samson stands out through its concentration on fish handling and vacuum truck applications. Buyers in these sectors can evaluate the pump together with the operating cycle and installation layout instead of adapting a general process package without application support.
Best Suited For: Vacuum truck builders and onshore or offshore fish handling equipment projects.
Before Purchasing: Provide the suction and discharge cycle, intended liquid handling arrangement, available drive and installation constraints. Clarify how fish or collected material moves through the overall system and what protection prevents unsuitable carryover into the pump.
6. Speck Pumps / Speck Industries
Company website overview.
Website: https://www.speckamerica.com/
Headquarters / Supply Model: German-headquartered pump manufacturer represented by its wholly owned US subsidiary, Speck Industries.
Core Products / Technologies: Liquid ring vacuum pumps and packaged vacuum systems, with OEM pump design and development support.
Why Consider Speck Pumps / Speck Industries: Speck combines liquid ring technology with an OEM-oriented design and manufacturing approach. Its US operation provides a contact point for buyers coordinating packaging, drive requirements and integration, while the group’s headquarters are in Roth, Germany.
Best Suited For: Equipment builders and OEM purchasing teams seeking a pump or compact vacuum package integrated into a larger machine.
Before Purchasing: Confirm the manufacturing and assembly location for the quoted model, flange arrangement, motor supply and service access. Ask which material and sealing choices apply specifically to the liquid ring model rather than to the broader pump portfolio.
7. KENFLO
Company website overview.
Website: https://www.kenflo-pump.com/
Headquarters / Supply Model: Guangdong, China-based pump manufacturer with research, production and sales operations.
Core Products / Technologies: Liquid ring vacuum pumps, including the CBF range, and separate liquid ring compressor and centrifugal pump lines.
Why Consider KENFLO: KENFLO provides a clear liquid ring vacuum pump category within a wider industrial pump manufacturing business. It is worth considering when buyers want to compare Chinese-manufactured vacuum equipment and define the supply through a detailed technical specification.
Best Suited For: Industrial purchasers evaluating a liquid ring pump alongside other plant pumping requirements.
Before Purchasing: Identify whether the requirement is vacuum generation or gas compression. Ask for the proposed CBF model or other suitable liquid ring vacuum series, its duty-point curve, materials and seal-liquid requirements; compressor models should be evaluated separately.
8. Shandong Boke Vacuum Technology
Company website overview.
Website: https://www.bokevac.com/
Headquarters / Supply Model: Zibo, Shandong-based vacuum equipment manufacturer with pump and system design capabilities.
Core Products / Technologies: 2BV, 2BE1, 2BE3, AT, TC, SK and 2SK water ring pump ranges, plus the 2BED two-stage range and vacuum units.
Why Consider Shandong Boke Vacuum Technology: Boke offers a broad water ring portfolio alongside other vacuum technologies. The availability of multiple liquid ring series makes it a useful comparison point for buyers evaluating stage arrangements and a pump or vacuum unit against a defined operating pressure.
Best Suited For: Process-equipment buyers comparing several liquid ring designs or sourcing pumps together with vacuum units.
Before Purchasing: Have Boke explain why the recommended series fits your inlet pressure and vapor load. Compare performance at your actual seal-liquid temperature, and confirm the selected materials, accessory list and spare-parts documentation.
9. Shandong Nade Vacuum Technology
Company website overview.
Website: https://www.sdnader.com/
Headquarters / Supply Model: Shandong, China-based vacuum equipment manufacturer offering pumps, vacuum units and customization.
Core Products / Technologies: 2BE1 and 2BE3 liquid ring pumps; 2BV2 threaded and 2BV5 flanged models; additional SK, SZ, SZB and other water ring ranges.
Why Consider Shandong Nade Vacuum Technology: Nade’s catalog distinguishes connection arrangements within its liquid ring offering, which is useful for buyers specifying piping interfaces or replacement equipment. Its broader vacuum-unit portfolio also gives procurement teams a route to discuss a packaged supply.
Best Suited For: Buyers comparing conventional water ring pumps, connection options and custom vacuum equipment.
Before Purchasing: State threaded or flanged connection requirements and provide existing drawings for replacement work. Confirm the exact performance curve and construction for the selected series, and agree the inspection and acceptance documents before placing an order.
10. Graham Manufacturing
Company website overview.
Website: https://graham-mfg.com/
Headquarters / Supply Model: Batavia, New York-based manufacturer of vacuum and heat transfer equipment with international operations.
Core Products / Technologies: Single- and two-stage liquid ring vacuum pumps, ejectors, surface condensers and process condensers.
Why Consider Graham Manufacturing: Graham is particularly relevant when vacuum performance and heat transfer must be engineered together. Its combination of liquid ring pumps, condensers and ejectors supports a discussion of the complete process arrangement and the interfaces between equipment.
Best Suited For: Refining, petrochemical, power and energy projects needing coordinated vacuum and heat transfer engineering.
Before Purchasing: Provide both the non-condensable gas load and the condensable vapor load, together with cooling utility limits. Define responsibility for the pump, condenser, ejector and controls, and agree the process performance guarantee and acceptance conditions.
How to Compare Liquid Ring Vacuum Pump Manufacturers
Start with the gas load at the required operating pressure. A headline displacement or ultimate-pressure value alone does not establish that a pump can maintain your process duty. Ask every bidder to use the same inlet gas composition, temperature, suction pressure, discharge conditions and seal-liquid assumptions.
| Selection factor | What to request | Why it matters |
|---|---|---|
| Duty-point performance | Capacity and absorbed power at the specified absolute suction pressure | Enables a useful comparison between proposed models |
| Seal-liquid conditions | Liquid type, inlet temperature, flow and allowable contamination | Changes the operating envelope and utility requirements |
| Stage arrangement | Selection rationale for single-stage, two-stage or a combined system | Connects the equipment design to the required pressure range |
| Recirculation scope | Once-through, partial or total recirculation diagram and utility list | Defines water demand, cooling duty and liquid treatment needs |
| Materials and seals | Model-specific wetted-material and sealing schedule | Supports compatibility review for the actual process medium |
| Service and acceptance | Inspection plan, spare-parts list and local support arrangements | Clarifies ownership after delivery and commissioning |
Cost of Sourcing Liquid Ring Vacuum Pumps Worldwide
A useful quotation separates the bare pump, motor, coupling, baseplate, separator, heat exchanger, pipework, instruments and controls. A lower initial pump price may leave substantial installation work outside the quoted scope. Compare equivalent equipment boundaries and operating assumptions before negotiating price.
Key Factors That Affect Your Price
- Capacity and operating pressure: The specified gas load and pressure determine the pump size and whether additional stages or equipment are needed.
- Process compatibility: Wetted materials and seal choices must suit the actual gas and seal-liquid mixture.
- Liquid circuit: Recirculation equipment adds capital cost and cooling requirements, while once-through operation requires an assessment of water supply and discharge costs.
- Electrical and control scope: Motor supply, instruments, control integration and any required hazardous-area documentation change the package scope.
- Delivery and lifecycle support: Freight, installation, commissioning, consumables and agreed spare parts should be included in the purchasing comparison.
Request an itemized offer with stated exclusions, delivery terms, commissioning responsibilities and warranty conditions. Lead time and price should be confirmed against the final configuration.
FAQs – Liquid Ring Vacuum Pump Manufacturers
What information should I send to liquid ring vacuum pump manufacturers?
Provide the required inlet capacity, normal and maximum gas loads, absolute suction pressure, discharge pressure, gas composition, vapor load and inlet temperature. Include seal-liquid and cooling utility conditions, electrical supply, installation limits and whether you need a bare pump or complete package.
Are water ring pumps and liquid ring pumps the same?
A water ring pump uses water as its operating liquid and belongs to the liquid ring category. Other liquids may be considered only after the manufacturer evaluates their properties and compatibility. Do not assume an existing water-based selection remains valid with another liquid.
Should I choose a single-stage or two-stage liquid ring vacuum pump?
Ask the manufacturer to select the arrangement from your required suction pressure and gas load. Compare capacity, power and liquid consumption at that duty point. A stage count alone does not establish suitability or operating cost.
Why does seal-liquid temperature matter?
The operating liquid’s vapor pressure affects the available vacuum range and pump performance. A curve based on cooler liquid may overstate the capacity available at your site. Request a selection using the expected operating temperature and an explanation of the cavitation protection required.
Can liquid ring pumps handle condensable vapors and liquid carryover?
They are commonly considered for wet and condensable gas duties. The permissible vapor load and liquid carryover depend on the selected pump, liquid circuit and process conditions. Ask whether an upstream separator or condenser is needed; do not assume unlimited liquid or solids tolerance.
Can I use a closed-loop liquid ring vacuum system?
A recirculating system may reduce fresh-liquid demand, but it still requires heat removal and a strategy for accumulated contaminants. Ask for a heat balance, separator design, makeup and bleed requirements, and a clear statement of any treatment equipment outside the supply scope.
What documents should I request for a hazardous-area installation?
State the applicable area classification and gas conditions, then request documentation for the exact proposed equipment. A motor certificate alone does not establish approval for the pump, its internal atmosphere or a complete skid. Agree the required scope with the manufacturer and project team.
How should I compare delivery, testing and after-sales support?
Ask each supplier to identify drawing approval milestones, the factory inspection and performance test scope, commissioning support and the recommended spare-parts package. Obtain a configuration-specific delivery schedule and written warranty terms before ordering.
Who Is the Best Liquid Ring Vacuum Pump Supplier?
The best supplier is the one whose proposed pump, liquid circuit and support arrangements fit your process. NASH and Graham are relevant to integrated process-system discussions, Samson has a distinct focus on fish handling and vacuum trucks, and other manufacturers offer different pump ranges and supply models. Evaluate the selected configuration rather than the company name alone.
For buyers seeking a China-based manufacturing partner for wet and condensable process duties, DV VACUUM is a recommended option to include in the shortlist. Its liquid ring pump range and custom system offering provide a practical basis for discussing the required duty and supply boundary together.
Send DV VACUUM your required capacity at operating pressure, gas composition, condensable vapor load, operating temperature, available seal liquid, cooling conditions, material compatibility needs, voltage and frequency, installation space and any hazardous-area requirements. State whether you need a standalone liquid ring pump or a complete vacuum system, and request a model-specific technical proposal with a clear equipment list.
