You are here: Home » Blogs » How Does A Water Ring Vacuum Pump Work

How Does A Water Ring Vacuum Pump Work

Views: 0     Author: Site Editor     Publish Time: 2024-04-05      Origin: Site


facebook sharing button
twitter sharing button
line sharing button
wechat sharing button
linkedin sharing button
pinterest sharing button
whatsapp sharing button
sharethis sharing button


In the vast field of industrial machinery, the water ring vacuum pump stands out due to its unique design and operation principle. This type of pump is widely used in various industries, including chemical, pharmaceutical, and food processing sectors. Its ability to handle moist air and vapors without contamination makes it invaluable. In this article, we will explore the working principle of a water ring vacuum pump and understand why it is preferred for certain applications.

Working Principle of a Water Ring Vacuum Pump

The water ring vacuum pump operates on a simple yet effective mechanism that uses water as a sealant, which forms a ring inside the chamber to create vacuum conditions.

Basic Structure

The core components of a water ring vacuum pump include an impeller, pump body, suction and discharge ports, and a sealing liquid (usually water). The impeller is positioned eccentrically within the cylindrical body of the pump.

Operation Cycle

  1. Initialization: When the pump starts, water is introduced into the pump body, forming a ring along the periphery due to centrifugal force created by the rotating impeller. This water ring creates sealed chambers between the impeller blades.

  2. Suction Phase: As the impeller rotates, these chambers increase in volume at the intake port side of the pump. This expansion lowers the pressure inside these chambers below atmospheric pressure, creating a partial vacuum that allows gas to be sucked into these chambers through the suction port.

  3. Compression Phase: As rotation continues, these chambers move towards the discharge side of the pump where they decrease in volume due to the eccentric position of the impeller relative to the casing. This decrease in volume compresses the gas within these chambers.

  4. Discharge Phase: Once compressed to near atmospheric pressure or slightly above it (depending on system requirements), valves open allowing for expulsion of this gas through discharge ports.

Role of Water

Water plays multiple roles in this process:

  • Sealing: It creates an effective seal that prevents backflow and maintains low pressure.

  • Cooling: It absorbs heat generated from gas compression thus protecting internal components.

  • Cleansing: It helps remove contaminants from incoming gases which might otherwise damage internal surfaces or reduce efficiency.


Water ring vacuum pumps offer several advantages over other types:

  • They can handle wet loads without risk of damage.

  • Minimal wear since there are no metal-to-metal contact surfaces within operational parts.

  • Low maintenance requirements due to simple construction.

  • Ability to manage explosive or corrosive gases when appropriate materials are used for construction and proper seals are maintained with suitable liquids.


Due to their robustness and versatility, water ring vacuum pumps are employed in several critical applications:

  • Chemical industry: For distillation processes or handling solvent vapors.

  • Pharmaceutical sector: In drying processes where contamination must be avoided.

  • Food processing: Particularly in operations requiring high hygiene standards like packaging under reduced oxygen conditions.


The working principle behind a water ring vacuum pump is both fascinating and practical. Its ability to efficiently create vacuums while handling potentially problematic gases safely makes it indispensable in many industrial settings. Understanding how these machines work not only highlights their importance but also underscores innovation in engineering designed for specific environmental challenges faced across industries today.

Shandong Kaien Vacuum Technology Co., Ltd.

Quick Links

Product Category

Leave a Message
Contact Us

Contact Us

     Phone : +86-130-0288-6558
    E-mail :
    Telephone:+86-0531-8750-3139
    Company headquarters2603-B, Building B1C, Qilu Gate, Greenland, Huaiyin District, Jinan City, Shandong Province
    Company production plant : No. 11111, Second Ring South Road, Jinan City, Shandong Province
Copyright © 2023 Shandong Kaien Vacuum Technology Co., Ltd. All rights reserved. Privacy Policy | Sitemap | Support By Leadong