Views: 5555 Author: JUSH Marketing Department Publish Time: 2025-11-25 Origin: Shanghai JUSH Pump
Medium to high viscosity (1000-100,000cst): NCB series heavy oil pumps or single/twin screw pumps are recommended, and their internal meshing structure can reduce the phenomenon of liquid trapping
Ultra-high viscosity (>100,000cst): A cam rotor pump or a three-screw pump, such as NYP10/1.0 stainless steel pump, supports 300,000cst medium
Rotor structure selection
Gear pump: simple structure, suitable for fluids with stable viscosity and low solid content
Progressive cavity pump: Single cavity pump (1.8MPa pressure) is suitable for particulate media, and twin progressive cavity pump is suitable for high-precision conveying
Lobe pumps: non-contact design, suitable for hygienic high viscosity media (e.g. food, pharmaceutical)
Key parameter adjustments
Rotational speed: high-viscosity fluids need to reduce the rotational speed (such as 6-30rpm for single-cavity pumps) to reduce wear
Material: Stainless steel (such as 304/316) for corrosive media, heat-resistant sealing is required under high temperature conditions
(Note: A video of the rotary lobe pump workflow will be inserted here in the actual answer to help understand the structural differences)
Fluid Viscosity Testing Methods
1.Capillary Method:
Viscosity is calculated by measuring the flow time of a liquid in a capillary tube. Suitable for low-viscosity liquids (such as water and ethanol). Commonly used instruments include the Auster viscometer and the Ubbelohde viscometer.
2. Rotational Viscometer Method:
This method measures viscosity by utilizing the resistance encountered by a rotor rotating in a liquid. It is suitable for liquids with a wide viscosity range. During operation, the appropriate rotor and rotation speed must be selected based on the liquid viscosity.
3.Falling Ball Method:
This method calculates viscosity by measuring the speed at which a small ball falls through the liquid. It is suitable for high-viscosity liquids (such as castor oil). During the experiment, it is essential to ensure that the ball falls along the central axis of the container and to account for corrections made by the container walls.
4. Other Methods
Rotating Cylinder Method: Measures the rotational resistance of liquid between concentric cylinders.
Falling Film Flow Method: Calculates the liquid film thickness based on the surface velocity, with an error controlled below 8%. When selecting a test method, the viscosity range of the liquid, the required measurement accuracy, and the experimental conditions must be considered.
As a professional manufacturer specializing in fluid transfer and metering technology, our company delivers high-performance solutions for industries that demand precision, hygiene, and reliability. With years of engineering experience and a strong commitment to quality, we have become a trusted partner for customers in food processing, beverages, pharmaceuticals, chemicals, cosmetics, and environmental protection.
Our main product lines include rotary lobe pumps, high-viscosity transfer pumps, sanitary-grade pumps, metering pumps, gear flow meters, and industrial liquid level meters. Each product is designed for stable operation, accurate flow control, and long service life. Using high-quality stainless steel materials and advanced manufacturing processes, our pumps ensure smooth conveying of thick, particulate, or shear-sensitive media such as chocolate paste, honey, syrups, creams, gels, and chemical slurries.
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