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This section provides an overview for liquid ring vacuum pumps as well as their applications and principles. Also, please take a look at the list of 25 liquid ring vacuum pump manufacturers and their company rankings. Here are the top-ranked liquid ring vacuum pump companies as of January, 2025: 1.VAKUO, 2.Shandong Zhangqiu Blower Co., Ltd, 3.Shanghai Shinjo Pump & Valve Co., Ltd..
Table of Contents
A liquid ring vacuum pump is a rotary pump that creates a vacuum by filling the pump casing with water and rotating the impeller inside.
To create a vacuum, the space between the impeller and the casing must change in volume. The Elmo type (eccentric type) is known to generate this volume change by shifting the impeller's mounting position from the center, and the Nash type (symmetric type) is known to generate it by making the casing elliptical in shape.
The Nash type can be smaller than the Elmo type for the same capacity. However, the pressure produced by the Elmo type is superior, so the Elmo type is widely used in vacuum pumps today.
The general use of vacuum pumps is to create a vacuum by removing gas from a container. However, liquid ring vacuum pumps are often used for suctioning gases, especially those mixed with water.
This is because water sealing is already used in the pump to create a vacuum, so any moisture in the suction and exhaust does not affect the pump.
The sealed water in the system also acts as a sealant, allowing the pump to be used under conditions where flammable or corrosive gases are present.
On the other hand, compared to other vacuum pumps, the vacuum attainment is considered to be low, but the two-stage structure of the pump can be used at a high vacuum to some extent.
Due to these features, specific applications of liquid ring vacuum pumps include priming of turbo pumps, vacuum pumps for condensers, vacuum pumps for extruders, and industrial uses of liquids in general.
As the name implies, liquid ring vacuum pumps create a vacuum by changing the volume between the impeller and the casing by rotating the impeller to form a ring of sealed water.
Liquid ring vacuum pumps are considered a type of positive displacement pump, meaning that the enclosed water acts as a piston to push the gas out. The water seal forms a ring-shaped liquid film that seals the inside of the pump, thereby preventing almost any gas leakage.
In this way, the water seal inside the pump plays an important role in liquid ring vacuum pumps, and the condition of the sealed water, especially its temperature, must be properly controlled.
Since the sealed water is enclosed in the casing that performs gas compression, the temperature of the sealed water rises as the pump continues to operate, resulting in a drop in the vacuum attained and a drop in the gas displacement rate.
Generally, there are several methods to maintain the temperature of the sealing water, including the method of running cooling water so that the sealing water is constantly replaced, the method of circulating and reusing the sealing water, and the method of cooling the sealing water using a heat exchanger.
*Including some distributors, etc.
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Sherline Products is a manufacturer of precision machine tools and accessories for the hobbyist, educational, and professional markets. The company was founded in 1970 and is headquartered in Vista, California. Its main activity is the design, development, and manufacturing of precision machine tools, including lathes, mills, and grinders. The company also offers a wide range of accessories, such as chucks, collets, and tooling. Sherline's products are used by a wide range of customers, including hobbyists, students, and professionals in the manufacturing, engineering, and aerospace industries.
The MD-Kinney company is a designer and manufacturer of displacement blowers, mechanical vacuum pumps, vacuum boosters, and engineered systems headquartered in Missouri, USA. The company was formed through the merger of M-D Pneumatics and Kinney Vacuum. It serves the chemical, food and beverage, pharmaceutical, automotive, and construction industries. The company offers PD rotary blowers, liquid and dry bulk blowers, lubricants, EX ATEX solutions, and pneumatic blower packages. It also provides dry screw vacuum pumps, rotary vane vacuum pumps, liquid ring vacuum pumps, vacuum boosters, and engineered vacuum solutions.
DANA-Technology ApS is a Danish manufacturer based in Tommerup Stationsby, South Denmark, developing machinery and equipment for the food and pet food industry. The company’s flagship product is the rotary disc texturizers, designed to transform emulsified meat into textured fibrous meat, such as beef, fish, and machine-separated meat, by coagulating proteins and carbohydrate sources. The company also develops machines with diverse capabilities, including dry or liquid filling, extruding or forming, and heat or cool treatment.
SATO VAC INC., established in 1932 and based in Tokyo, Japan, is a manufacturer of vacuum equipment including vacuum pumps, measuring instruments, and parts & components. Its production line is segmented into vacuum pumps, gauges, and equipment used in space development, semiconductors, energy, medical, optics, and automobile industries. The company's vacuum equipment includes compact CVD systems, vacuum defoamers, heat treatment furnaces, dryers, and evaporation systems. The company's production process involves structural designing, prototype creation, design review, and performance testing.
SHINKO SEIKI CO., LTD., established in 1949, and located in Kobe, Japan, is a manufacturer of vacuum devices, electric furnaces and semiconductor manufacturing equipment. Its product line includes a vast array of vacuum pumps such as mechanical booster pumps, vacuum exhaust unit, oil sealed rotary vacuum pumps and water ring vacuum pumps. Its product range also inlcudes soldering equipments, optical inspection equipments, thin film forming equipments, and plasma processing equipments. The company holds several certification for its operation such as the ISO 14004, and the ISO 9001.
Pompetravaini S.p.A., founded in 1929 and headquartered in Castano Primo, Italy, is an industrial pump manufacturer and supplier. The company's products include liquid ring pumps, centrifugal pumps, and multi-stage self-priming pumps. It also offers vacuum skills, blowers, and exhausters. These products are used in various industries for the control and flow of gas, liquids, and viscous materials, which include chemical processing, food processing, and pharmaceutical production. The company offers original equipment manufacturing services and accepts orders from wholesalers.
Hydro-Vacuum S.A. is a PN-N-18001:2004-certified industrial pump and pumping systems manufacturer originally established in Grudziądz, Poland, in 1862 before being incorporated in 2001. The company offers sewage and water supply pumps, as well as specialized pumping systems tailored to various applications. It also offers onsite foundry services for the production of castings, fittings, and other components for use in conjunction with its portfolio of pumps. The company mainly serves the industrial processing sector, including clients in sewage treatment, chemical refining, and water management operations.
Shandong Zhangqiu Blower Co., Ltd., established in 1968 and based in Jinan, China, is a manufacturer of blowers and fans. The company also produces various products such as screw blowers, centrifugal blowers, industrial pumps, liquid ring vacuum pumps, and turbo blowers. The company has been awarded with the ISO9001 and ISO14001 certificates. The blowers are made with American technology to meet the EU and North American standards. All the products are used in various applications, such as wastewater treatment, zinc plating, paper making and printing, and air combustion.
Greentech International Co. Ltd., founded in 1991 and headquartered in Shandong, China, is a blower and vacuum pump developer and manufacturer. The company's products include liquid-ring vacuum pumps, root blowers, and multistage centrifugal blowers. It also offers centrifugal fans, industry pumps, and pneumatic conveying equipment. These products have applications in wastewater treatment pants, pneumatic material handling systems, and freeze drying for food processing plants. The company offers custom solutions to meet client-specific requirements and also offers original equipment manufacturing services.
Shanghai EVP Vacuum Technology Co. Ltd., is a manufacturer and supplier of vacuum solutions, headquartered in Shanghai, China. Its product offerings include liquid ring vacuum pumps, vacuum valves, and oil diffusion vacuum pumps. These products have diverse applications in industries such as coal mining, papermaking, sugar production, pharmaceuticals, and the chemical industry. Its manufacturing facility is well-equipped with CNC machining centers and testing and analysis equipment. All its products adhere to the DIN and ISO 9000:2008 standards and are CE certified. The company has supplied vacuum solutions to customers in over 80 countries and regions worldwide.
Founded in Osaka, Japan in 1950, Osaka Vacuum, Ltd. is a manufacturer of vacuum pumps and systems that holds the ISO14001 certification. Their extensive product line includes a wide range of vacuum pumps, such as dry, turbo molecular, liquid ring, and root pumps. oil-sealed rotary pumps, ejectors, and other vacuum equipment are also offered. They also provide vacuum systems for various applications such as general vacuum exhaust, freezing, drying, etching, distillation, polymerization, and more, serving markets including semiconductor, solar, iron and steel, textile, food, oil, atomic energy, and many others.
Emtivac Engineering Pty. Ltd., founded in 1997 and headquartered in Victoria, Australia, is a specialized manufacturer, distributor, and supplier of a range of process vacuum and hazardous gas compression systems. The company produces each system to meet the requirements of each client and has completed projects that include the design, fabrication, and supply of eight liquid ring vacuum pump units for a new aluminum refinery in Saudi Arabia. It serves industries ranging from mining and manufacturing to defense and aeronautics. Many of its products designed for use in one industry can be modified to be used in others.
Vakuo GmbH, founded in 2003 and headquartered in Friedrichsdorf, Germany, is a specialized manufacturer of industrial pumps and systems. The company offers liquid-ring vacuum pumps and complete vacuum systems to European process industries, primarily for the pulp and paper industry, sugar production, and power industries, and mostly works with original equipment manufacturers, original design manufacturers, and engineering contractors. It also offers services that include field testing and audits, ongoing maintenance contracts, and repairs.
Guangdong Kenflo Pump Co., Ltd, since 1954, is a professional pump manufacturer, including R & D, sales, and production. The products include centrifugal pumps, liquid ring vacuum pumps, liquid ring compressors, casing multistage pumps, and fluid equipment used in water supply, air conditioning, petroleum, power plants, and light industries. The company has mold manufacturing, welding, machining, heat treatment, and casting capabilities. The company has a quality management certificate ISO 9001:2015, environmental management certificate ISO 14001:2015, and CE certification.
Körting Hannover GmbH, founded in 1871, is a manufacturer and supplier headquartered in Hannover, Germany, that specializes in vacuum engineering products and environmental technology. The company's product portfolio includes ejectors and vacuum technology, waste gas cleaning and environmental technology, and process heat and firing technology. These products serve industries with tailored solutions in vacuum technology, gas cleaning, chemical processes, energy generation, and more. The company collaborates with science, research, and business sectors globally to develop advanced solutions for vacuum engineering and environmental technology. It also provides after-sales services such as installation, commissioning, troubleshooting and maintenance.
Finetech Vacuum Pumps, founded in 2015 and headquartered in Gujarat, India, is a specialized manufacturer of vacuum pump products and vacuum spares. The company's products include two-stage vacuum pumps, single-stage vacuum pumps, and steam jet ejector vacuum systems, which are used in various process manufacturing applications as well as chemical and liquid refining systems. It serves industries that include petroleum refining, chemical processing, and food processing. Apart from providing production and distribution of its products, it also offers ongoing after-sales services, such as regular maintenance and consulting.
Busch Vacuum Solutions was founded in 1963 in Virginia Beach, Virginia, US, as a manufacturer of vacuum pumps and systems, compressors, and blowers. The comprehensive product portfolio encompasses solutions tailored for vacuum and overpressure applications across diverse industries, such as chemicals, semiconductors, plastics, and food. The products have a wide array of applications, ranging from packaging food and sterilizing medical equipment to lifting substantial steel tubes. They also play a crucial role in combating diseases, addressing malnutrition, and facilitating the process of digitalization.
Edwards Vacuum is a British multinational vacuum and ultra-high vacuum pump manufacturer, founded in 1919 and headquartered in Burgess Hill, and has been a subsidiary of Atlas Copco since 2014. The company provides vacuum products, abatement solutions, and related services, including dry pumps, turbomolecular pumps, and leak detection equipment. They cater to power, glass, pharmaceutical and chemical, scientific instruments, and research and development applications. They minimize the environmental impact of semiconductor manufacturing and delivering cutting-edge products that meet the needs of their customers.
Vooner FloGard LLC, founded in 1983 and based in Charlotte, North Carolina, is a manufacturer of dewatering solutions and systems, including vacuum pumps, strainers, and separators. The company is a member of the Aerzen group, and the other products it stocks include nozzles, brushes, and actuators. In 2003, the company added dewatering products and systems for paper mills to its product portfolio, and it currently serves several industries, including paper, food processing, and mining. The company tests its pumps according to HEI (Heat Exchange Institute) specifications and provides actuator repair services.
SPECK Pumpen is a German manufacturer of pumping systems established in 1909 and headquartered in Roth, Bavaria. The company’s product lineup includes vacuum pumps that utilize a rotating impeller with liquid sealant, self-priming and single-stage centrifugal pumps, side channel pumps and multistage pumps that utilize parallel impellers as well as submersible models that move fluids with the use of a hermetically sealed motor paired with an impeller. SPECK Pumpen supplies clients like Nestle, the Carrier Corporation, Suez and many more through a network of partner distributors and subsidiaries in North America, Europe and Asia.
Atlas Copco UK Holdings Limited, established in 1974 in the UK, is a distributor and supplier of a wide range of industrial tools and machinery used in the aerospace, mobile construction, air motors, and electric motor industries. The company's product portfolio includes air compressors, N2 and O2 generators, tools, and industrial assembly solutions. Atlas Copco UK Holdings Limited also offers a range of products for mobile construction, including power generators, as well as providing clients with 24/7 tool and equipment rental solutions.
Taizhou Shouzhen Machinery Co., Ltd., founded in 1992 and based in Zhejiang, China, is a reputable supplier and manufacturer specializing in vacuum pump machinery and equipment. The company offers a diverse range of products, including industrial pumps, compressors, and related accessories, delivering tailored solutions that effectively address the unique requirements of various sectors, including construction and agriculture. Leveraging advanced manufacturing processes and stringent quality control measures, the company ensures that its products consistently meet rigorous international standards.
Nash was established in 1859 and is headquartered in Norwalk, Connecticut, U.S.A. is a manufacturer of vacuum solutions. The company offers an array of products including liquid ring vacuum pumps, vacuum booster pump and ejector systems, and custom-engineered vacuum systems. These products find applications in waste and sewage water treatment industries, power distributors and suppliers, and paper processing factories. It extends services like training of technicians, customization of specialty tools, and rapid repairs backed by the manufacturer’s warranty.
Shanghai Shinjo Pump & Valve Co., Ltd., established in 2010 and headquartered in Shanghai, China, specializes in the manufacturing of industrial valves and pumps such as ball valves, check valves, and gate valves. The company offers an array of products, including magnetic drive pumps, chemical process pumps, electric control valves, pneumatic control valves, pressure-reducing valves, and more. These products are used in diverse sectors, including chemical production, environmental protection, civil construction, and metallurgical engineering.
Ranking as of January 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | VAKUO |
12.1%
|
| 2 | Shandong Zhangqiu Blower Co., Ltd |
7.1%
|
| 3 | Sherline Products |
5.7%
|
| 4 | Shanghai Shinjo Pump & Valve Co., Ltd. |
5.4%
|
| 5 | Guangdong Kenflo Pump Co.,Ltd |
5.4%
|
| 6 | Taizhou Shouzhen Machinery Co., Ltd. |
5.2%
|
| 7 | SATO VAC INC. |
4.7%
|
| 8 | Osaka Vacuum, Ltd. |
4.4%
|
| 9 | Greentech International Co., Ltd. |
4.2%
|
| 10 | The MD-Kinney company |
3.9%
|
Derivation Method
The ranking is calculated based on the click share within the liquid ring vacuum pump page as of January 2025. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
China
|
6 | 28.6% |
|
Japan
|
3 | 14.3% |
|
Germany
|
3 | 14.3% |
|
United States of America
|
2 | 9.5% |
|
Italy
|
2 | 9.5% |
|
Denmark
|
1 | 4.8% |
|
Poland
|
1 | 4.8% |
|
Australia
|
1 | 4.8% |
|
India
|
1 | 4.8% |
|
United Kingdom
|
1 | 4.8% |
320 products found - Page 2
320 products - Page 2
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