A high-viscosity internal gear pump is a positive displacement pump designed for transferring high-viscosity fluids such as lubricating oils, resins, coatings, adhesives, chemical additives, and polymers. Its internal gear and external gear create sealed cavities that provide continuous, controlled fluid transfer.
With strong suction performance and stable low-speed operation, it is suitable for high-viscosity fluids and widely used for fluid transfer, metering, circulation, and blending. Optional heating jackets, electric heating, wetted materials, and mechanical seals can be configured for different operating conditions.
Internal gear pump, external gear pump, rotary lobe pump, and vane pump
Designed for high-viscosity fluid handling, with stable pumping of resins, coatings, lubricants, and other high-consistency fluids
Primarily using an internal gear design, with modified external gear options for special applications. The sealed pumping cavities enable stable transfer of resins, coatings, lubricants, and other high-viscosity fluids.
Good suction capability supports stable handling of high-consistency fluids. Temperature control helps prevent excessive viscosity increase and maintains continuous, stable pumping.
High-precision gear design supports different viscosity conditions, providing stable flow, low operating noise, and reliable pump performance for extended service life.
The pump body and seal chamber can be equipped with an integrated heating jacket for steam or thermal oil heating, or cooling fluid circulation, helping prevent high-viscosity fluids from solidifying or becoming excessively viscous.
Designed in accordance with widely used international standards, with sealing systems supporting API 682 seal flushing practices for industrial projects and automated process lines.
The pump design considers on-site maintenance requirements, with a simple structure and convenient servicing to help reduce downtime and support continuous production.
An internal gear pump is a positive displacement pump that uses an internal gear and a smaller external gear. As the gears rotate, they form sealed cavities that continuously draw in and discharge fluid, making the pump well suited for high-viscosity fluids such as resins, adhesives, additives, asphalt, heavy oil, and coatings.
As the gears separate on the suction side, the expanding cavity creates a pressure differential that draws fluid into the pump. The large suction area supports reliable feeding of high-viscosity fluids, while the internal gear design provides smooth flow, low pulsation, and stable low-speed operation, helping reduce shear and heat generation.
Internal gear pumps are widely used for fluid transfer, metering, circulation, and blending in the lubricants, chemical, coatings, and other process industries. Pump configurations can be selected based on fluid viscosity, temperature, pressure, flow rate, and material compatibility.
An external gear pump is a positive displacement pump that uses two externally meshing gears. As the gears rotate, the changing volume between the gear teeth and pump casing draws in and discharges fluid. With a simple structure and easy maintenance, external gear pumps are widely used for hydraulic oil, lubricating oils, and other low- to medium-viscosity fluids.
External gear pumps offer reliable fluid transfer, simple maintenance, and relatively low cost. However, their suction performance and efficiency can decrease with very high-viscosity fluids, especially at higher speeds. For high-viscosity materials such as resins, additives, asphalt, and thick coatings, internal gear pumps are generally more suitable.
Pump selection depends on fluid viscosity, suction conditions, pressure, temperature, and required flow rate. Specially designed external gear pumps can also be configured for specific high-viscosity applications.
BJVP provides positive displacement gear pumps, including internal gear pumps and external gear pumps, for fluid transfer across a wide range of viscosities and operating conditions. They are suitable for lubricating oils, additives, asphalt, solvents, polymers, coatings, and other industrial fluids.
BJVP U-Series gear pumps are available in standard, jacketed, and electrically heated configurations. Jacketed models use steam or thermal oil for heating and temperature maintenance, while electrically heated models provide an independent heating option for additives, asphalt, waxes, and other temperature-sensitive fluids.
Depending on fluid properties and process requirements, pumps can be configured with ductile iron, carbon steel, 304/304L or 316/316L stainless steel, and other alloys. Sealing options include mechanical seals, cartridge seals, double mechanical seals, triple-lip seals, and packing seals.
With reliable suction performance and stable flow, BJVP gear pumps are widely used in petroleum, chemicals, lubricants, coatings, food, and general industrial applications.
Up to: 1,600 GPM / 364 m³/h
28–2,000,000 SSU (approx. 1–440,000 cSt)
Up to 200 PSI / 14 bar (may be higher depending on fluid viscosity)
-50°C to +230°C (-60°F to +450°F)
From process design and pump selection to manufacturing, commissioning, and after-sales support.
We design gear pump and fluid transfer solutions based on fluid viscosity, temperature, flow rate, pressure, and operating conditions.
We select internal or external gear pumps based on fluid properties and process requirements, with suitable materials, seals, and heating.
We handle gear pump machining, assembly, testing, and quality inspection in-house to control quality and ensure performance and delivery.
We provide installation guidance, on-site commissioning, and operational support for stable pump operation and production requirements.
Common questions about high-viscosity gear pump selection, applications, and fluid transfer
Contact us to discuss your project requirements and find suitable manifold, pigging, and fluid handling solutions.
We are a manufacturing solution with more than 30 years of experience in manifold systems