Tianjin Shuangjin Pump Machinery Co., LTD., as a leading enterprise in the domestic fluid equipment field, has a product line covering the full range of pump equipment such as single-screw pumps, gear pumps, and centrifugal pumps. Recently, the company’s technical team has conducted an in-depth analysis of the core differences between centrifugal pumps and positive displacement pumps, providing professional guidance for industrial selection.
I. Working Principle: The essential difference between centrifugal force and volume control
Centrifugal pumps generate centrifugal force through the rotation of the impeller, which throws the liquid from the center to the outer edge to achieve transportation. Its flow rate is positively correlated with the pressure, but the pump needs to be pre-filled and the pressure range at the outlet is fixed. Positive displacement pumps, on the other hand, rely on the volume changes in the sealed working chamber (such as gear meshing and screw rotation) to directly squeeze the liquid, achieving periodic transportation of “suction – discharge”. The flow rate is independent of the pressure, and the outlet pressure can be infinitely increased. Moreover, they have self-priming capabilities.
Ii. Product Features: Precise matching of viscosity adaptability and application scenarios
Taking the NHGH series arc gear pump of Tianjin Shuangjin Pumps as an example, this positive displacement pump product is specially designed for conveying media without solid particles and with a temperature of ≤120℃. It can be used as a transmission and booster pump in the oil conveying system, achieve injection conveying in the fuel system, and provide stable power in hydraulic transmission. Its high-precision gear structure ensures the reliability of medium conveying. The centrifugal pump products, through small-capacity designs such as 25-diameter and 40-diameter, meet the efficient transportation requirements of low-viscosity liquids in the chemical industry. The improvement of the CZB series has further expanded its application range.
Iii. Technological Advantages: Independently developed and scenario-based solutions
Tianjin Shuangjin Pumps, relying on its technology research and development system in cooperation with universities, has obtained multiple national patents, and its products have reached the advanced level in the industry and internationally. The company offers customized solutions for different scenarios: Positive displacement pumps, with their strong adaptability to high-viscosity media such as heavy oil and asphalt, have become the preferred choice in the fields of petroleum refining and chemical processing as well as quantitative dosing in the pharmaceutical industry. Centrifugal pumps, with their advantages of simple structure and low maintenance cost, are widely used in high-flow scenarios such as municipal water supply and cooling of chemical processes.
Iv. Enterprise Strength: Full-chain service and high-end manufacturing capabilities
As a high-tech enterprise in Tianjin, Tianjin Shuangjin Pumps strictly controls the entire process from raw material processing to finished product inspection, and has the ability to undertake the maintenance and drawing of high-end foreign products. The company ensures the high precision and reliability of its products through information management, sophisticated equipment and advanced detection methods, providing optimized fluid solutions for global users.
Conclusion
The selection of centrifugal pumps and positive displacement pumps should take into account the characteristics of the medium, pressure requirements and economy. With its independent research and development capabilities and a full-scenario product matrix, Tianjin Shuangjin Pumps is driving China’s fluid equipment technology to a new height.
Post time: Oct-21-2025