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NCB3/2 Double Hydraulic Gear Pump

The NCB3/2 is a tandem-type internal gear pump from the NCB series, designed by integrating two pumping sections in series within a single housing. It features the internal meshing gear principle with a crescent plate separating the gears, ensuring smooth, low-noise operation with no liquid trapping. Driven by a common shaft, it delivers combined or dual flow outputs (3 m³/h and 2 m³/h sections) for versatile hydraulic circuit requirements. Compact, reliable, and built for high-viscosity fluids (0.02–20 Pa·s), it is widely used in petroleum, chemical, grease, and coating industries.

Model:
NCB3/2
Brand:
Green Hydraulic
Model Number:
NCB3/2
Packaging Details:
Standard export carton/plywood case
Testing Before Shipment:
Yes
Cartification:
ISO9001，CE
Markets:
• Industrial • Energy • Government (Non Aerospace) • HVAC • Mobile • Natural Resources • Transportation (Non Aerospace)
Application:
1. Industrial Hydraulic Systems 2. Mobile Equipment (Industrial Vehicles) 3. Construction and Engineering Machinery 4. Metallurgy Industry
Shaft Type:
Key Shaft and Spline shaft


Availability:



Inquiry

Product Description

NCB3/2 Gear Pump Overview

The NCB3/2 is a high-performance, fixed-displacement tandem internal gear pump engineered for compact hydraulic and fluid transfer systems that demand reliable dual-flow output and maximum durability. Featuring a robust integrated tandem design, the NCB3/2 delivers two independent flow rates (3 m³/h and 2 m³/h) from a single shared shaft, offering exceptional power-to-space efficiency for direct mounting in equipment where footprint is limited and performance is critical.

NCB3+2

Features and Benefits

Integrated Tandem Internal Gear Design:
The NCB3/2 utilizes two precision internal gear pumping sections driven by a common shaft within a single housing, eliminating the need for two separate pumps. This compact configuration provides independent or combined flow outputs, reducing installation space and simplifying system plumbing for dual-circuit applications.
High-Viscosity Fluid Compatibility:
Designed with a crescent-style internal gear mechanism, the NCB3/2 excels at handling high-viscosity fluids (0.02–20 Pa·s) such as oils, greases, and viscous chemicals. Its smooth, low-pulsation operation minimizes shear stress on sensitive fluids while maintaining consistent volumetric efficiency even at varying viscosities.
Robust Cast Iron Construction:
Built with heavy-duty cast iron bodies and covers, the NCB3/2 offers superior structural rigidity compared to lighter alternatives. This construction minimizes deflection and mechanical fatigue under continuous operation, ensuring stable performance and extended service life in demanding industrial environments.
Self-Priming & Low-Noise Operation:
The internal meshing gear principle enables reliable self-priming capabilities, making the NCB3/2 suitable for suction lift applications. The gear and crescent design eliminates fluid trapping, resulting in quieter, vibration-free operation compared to external gear pumps.
Versatile Mounting & Porting Options:
The NCB3/2 supports standard foot and flange mounting configurations, with flexible port orientations to accommodate cramped installation spaces. Its modular design allows for direct integration into petroleum, chemical, grease, and coating processing systems with minimal modification.
Corrosion-Resistant & Low-Maintenance Design:
Constructed with wear-resistant components and precision-machined surfaces, the NCB3/2 minimizes internal friction and wear. The design requires minimal routine maintenance, reducing downtime and long-term operational costs in continuous-duty applications.

Specifications

Model Codes

Technical Data

Parameter	Specification
Pump Type	Tandem Internal Gear Pump
Displacement/Flow Rates	3 m³/h + 2 m³/h (total 5 m³/h)
Rated Speed Range	220–600 rpm
Max. Working Pressure	1.0 MPa (10 bar)
Fluid Viscosity Range	0.02–20 Pa·s (20–20,000 cP)
Operating Temperature Range	-10°C to 180°C (up to 300°C with optional heating/cooling jacket)
Shaft Seal Options	Mechanical seal / Packing gland
Pump Body Material	Cast iron (standard); Stainless steel (optional)
Gear Material	Alloy steel, heat-treated for wear resistance
Shaft Material	Carbon steel / Stainless steel
Mounting Configuration	Foot-mounted / Flange-mounted
Port Orientation	Side/rear inlet/outlet ports (90° configurable)
Efficiency	≥ 85% (at rated conditions, medium viscosity fluids)
Noise Level	≤ 70 dB(A) at rated speed
Self-Priming Capability	Up to 5 m suction lift (clean, non-volatile fluids)
Applications	Petroleum, chemical, grease, coating, and food-grade fluid transfer

NCB3/2 Hydraulic Gear Pump Installation Dimensions：

Applications

Applications

The NCB3/2 tandem internal gear pump is a rugged, high-viscosity fluid transfer solution specifically tailored for industrial and process systems where compact footprint, dual-flow capability, and exceptional reliability are required:

Petroleum & Oil Transfer:
A primary choice for fuel oil, crude oil, and lubricating oil transfer in refineries, storage terminals, and pipeline systems, where the tandem design enables simultaneous supply to two independent circuits or boosted flow to a single system.
Grease & Lubrication Systems:
Optimized for thick greases, heavy lubricants, and semi-solid fluids, where the internal gear design ensures smooth, pulsation-free flow even at low speeds, supporting centralized lubrication systems for machinery and equipment.
Chemical & Process Industries:
Widely used in chemical processing plants for transferring resins, paints, adhesives, and other viscous chemicals, with corrosion-resistant material options available to handle mild acids, bases, and aggressive media.
Coating & Printing Applications:
Ideal for ink, varnish, and coating fluid handling in manufacturing and printing lines, offering precise, consistent flow control that prevents fluid degradation and ensures uniform application quality.
Food & Beverage Processing (Optional):
Frequently employed in food-grade applications (with stainless steel construction) for transferring syrups, molasses, edible oils, and other high-viscosity food products, meeting hygiene standards while maintaining gentle fluid handling.

Vane Pump Application

Factory&FAQ

Packaging & Delivery

NCB3/2 pumps are typically packaged securely to prevent damage during transit. The packaging includes:

Protective Wrapping: To safeguard the pump from environmental damage.

Custom Crates: For larger, heavier pumps, ensuring safe handling.

Documentation: Includes installation, maintenance instructions, and warranty details.

Delivery time depends on the model, customizations, and location but typically ranges from 2 to 6 weeks from the order date.

NCB3/2 Gear Pump FAQ:

1. What are NCB3/2 series gear pumps?

The NCB3/2 is a high-performance, fixed-displacement tandem internal gear pump. It integrates two pumping sections (3 m³/h and 2 m³/h) in a single housing, driven by a common shaft. Designed for viscous fluid transfer and dual-circuit hydraulic systems, it delivers reliable, low-pulsation flow with compact installation footprint.

2. What makes the NCB3/2 different from standard single pumps?

Dual-Flow Tandem Design: Unlike single pumps that provide only one flow rate, the NCB3/2 delivers two independent outputs (3 m³/h + 2 m³/h) from one unit, eliminating the need for two separate pumps and reducing installation space and cost.
Internal Gear Mechanism: Its crescent-style internal gear design excels at handling high-viscosity fluids (up to 20,000 cP) with smooth, low-noise operation, outperforming external gear pumps in thick media applications.
Robust Integrated Construction: Built with heavy-duty cast iron, it minimizes deflection under continuous pressure, ensuring longer service life compared to lighter, multi-pump setups.

3. What is the working pressure range of NCB3/2 pumps?

The NCB3/2 is optimized for industrial process and fluid transfer applications.

Continuous Working Pressure: Up to 1.0 MPa (10 bar).
Intermittent/Peak Pressure: Up to 1.2 MPa (12 bar).

This pressure rating makes it ideal for viscous fluid transfer, lubrication systems, and low-to-medium pressure process circuits.

4. Can NCB3/2 pumps replace other brands?

Yes, the NCB3/2 is a reliable, cost-effective alternative to other tandem internal gear pumps. It is often used as a direct replacement for:

Traditional NCB series tandem pumps
Generic dual-flow internal gear pumps in chemical and grease applications
Other split-shaft or twin-section gear pumps with similar flow ratings

To ensure compatibility, verify the port configuration, mounting flange, shaft type, and flow rates to match your existing system requirements.

5. What fluids are suitable for NCB3/2 gear pumps？

To protect the precision internal gears and minimize wear, the following fluids are recommended:

Fluid Type: Oils, greases, resins, paints, and other non-abrasive, non-corrosive viscous fluids. For corrosive media, stainless steel construction is required.
Viscosity Range: 20 to 20,000 cP (0.02–20 Pa·s), with optimal performance at 100–5,000 cP.
Filtration: Cleanliness is vital for gear and bearing protection. A minimum filtration level of ISO 4406 18/16/13 is recommended to prevent abrasive particles from damaging internal components.

6. What is the typical speed range of NCB3/2 pumps?

The NCB3/2 is designed for low-to-medium speed operation, suited for viscous fluid transfer:

Standard Operating Speed: 220–600 rpm (revolutions per minute).

The lower speed range ensures gentle handling of high-viscosity fluids, preventing shear damage and excessive wear on internal components.

7. Do you provide OEM or customized services?

Yes, we support OEM and customization, including nameplate, packaging, and specific performance requirements. Send us your drawings or specifications for evaluation.

8. How can I get a quotation quickly

Please provide the following details:

Model or displacement
Working pressure
Speed
Quantity
We will reply within 12 hours with a competitive quotation.

Certifications & Quality Assurance

NCB3/2 pumps are manufactured in compliance with international standards, ensuring high performance and reliability:

ISO 9001: Certified for quality management systems.

CE Certification: Ensures compliance with European safety, health, and environmental protection standards.

RoHS Compliance: Ensures the pump does not contain hazardous materials.

Factory Testing: Every pump is rigorously tested for performance, pressure, and leak integrity before shipping.

FAQ

1.What's our advantages?

Factory established in 2005;

With a great deal of production experience;

80+ employees become the professional team;

Constant updated ERP system ensure efficiency of work;

Sophisticated equipment ehanced the accuracy of products;

Professional salesmen provide the greast service;

With a large number of famous customers all over the world;

Great after-sales service;

With the long term cooperation with famous logistics and express company in China,provide the better goods service.

2.What is your payment terms?

Small order/sample order,full payment in advance; Big orders send the first payment 30% before the production,and the balance before shippment.We'll show the photos of the products and packages before delivery.

3.Can you make my own brand on the products?

Of course we can. Just send me your logo we can make it for you.

4.What is our main export market?

America(40.5%):USA, Canada, Argentina, Brazil

Europe(30.8%):Italy,Germany,England,Holland,Spain,Swiss,Finland,Russia,Poland.

Asia(23.5%):Korea,singapore,India,Turkey,Vietnam,Saudi Arabia,Syria, Israel,Lebanon.

Others(5.8%).

Unedited footage of the Green Hydraulic Factory

The Green hydraulic pump manufacturing facility is a specialized industrial plant that focuses on producing hydraulic pumps and related components. These factories are equipped with advanced machinery and technology to fabricate high-quality pumps designed for a wide range of applications, from heavy equipment and machinery to automotive and industrial systems.

The production process typically involves precision engineering, where raw materials like metals and alloys are processed into pump components such as gears, pistons, cylinders, and seals. These parts are then assembled into fully functional hydraulic pumps, which are tested for performance and quality control to ensure reliability, efficiency, and durability under various working conditions.

Green Hydraulic's manufacturing facilities for hydraulic pumps maintain stringent quality standards, often adhering to international certifications, to meet the expectations of customers in industries such as construction, agriculture, automotive, and manufacturing.

Unedited footage of the Green Hydraulic Factory3

All hydraulic pumps produced by Green Hydraulic have undergone compliance testing, ensuring their quality and reliability.

Unedited footage of the Green Hydraulic Factory4

To meet the diverse needs of different industries, the green hydraulic offer customization options, such as specialized seals, materials, and pump configurations. These facilities often work closely with engineering teams to develop tailored solutions for specific applications, from high-pressure systems to low-flow, high-efficiency pumps.

Unedited footage of the Green Hydraulic Factory5

Each pump undergoes a rigorous quality control process, where pressure tests and performance assessments are conducted to ensure that the pumps meet the required standards for flow rate, pressure capacity, and durability.