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NCB2/2 Double Gear Pump Hydraulic

The NCB2/2 is a tandem internal gear pump integrating two NCB pumping sections in one housing, driven by a common shaft. Adopting the internal gear meshing principle, it features a compact structure, stable flow, low noise, and high efficiency. Designed for handling high-viscosity fluids (0.02–20 Pa·s), it is widely used in petroleum, chemical, coating, and food industries. This tandem design enables dual-circuit fluid supply with independent flow rates, saving space and simplifying system configuration.

Model:
NCB2/2
Brand:
Green Hydraulic
Model Number:
NCB2/2
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
MOQ:
1 set


Availability:



Inquiry

Product Description

NCB2/2 Gear Pump Overview

The NCB2/2 is a compact, fixed-displacement tandem internal gear pump designed for hydraulic and fluid transfer systems requiring two independent flow circuits from a single drive source. Engineered for high-viscosity fluid handling and continuous-duty operation, this pump combines two NCB pumping sections in a common housing, delivering reliable, synchronized performance in mobile, industrial, and process applications where space efficiency and dual-circuit functionality are critical.

NCB2+2

Features and Benefits

Compact Tandem Integrated Design:
The NCB2/2 integrates two independent pumping stages into a single, shared housing with a common drive shaft, eliminating the need for separate pumps, couplings, and mounting hardware. This unified construction reduces installation footprint, simplifies system piping, and lowers overall weight while ensuring perfectly synchronized operation of both circuits.
High-Efficiency Internal Gear Meshing Principle:
Utilizing the proven crescent-type internal gear design, the NCB2/2 delivers smooth, low-pulsation flow with high volumetric efficiency, even with high-viscosity fluids (0.02–20 Pa·s). The meshing action inherently minimizes flow turbulence, reducing noise, vibration, and wear while maintaining consistent performance across varying load conditions.
Superior Viscosity and Fluid Compatibility:
Built to handle a wide range of media, including oils, resins, polymers, and food-grade fluids, the NCB2/2 features precision-machined internal components that resist wear from viscous or slightly contaminated fluids. The design is tolerant of temperature variations, making it suitable for both heated and ambient-temperature process environments.
Independent Circuit Performance:
Each pumping section of the NCB2/2 operates with its own dedicated inlet and outlet ports, allowing for two separate flow rates and pressures from a single drive. This flexibility enables dual-circuit systems (e.g., auxiliary and main hydraulic functions) to share one power source, reducing system complexity and cost without sacrificing performance in either circuit.
Rugged, Long-Lasting Construction:
Featuring heavy-duty cast iron or optional stainless steel housings, high-strength alloy gears, and precision-ground wear components, the NCB2/2 is built for continuous-duty cycles in demanding industrial and mobile environments. Its robust construction minimizes internal deflection under pressure, extending service life and reducing maintenance requirements.

Specifications

Model Codes

Technical Data

Parameter	Specification
Pump Type	Fixed-displacement tandem internal gear pump (two NCB2 stages on a common shaft)
Displacement (per stage)	2.0 cm³/rev (0.12 in⊃3;/rev)
Total Displacement	4.0 cm³/rev (0.24 in⊃3;/rev)
Max. Continuous Operating Pressure	20 bar (2.900 psi) per stage; 20 bar (2.900 psi) system
Max. Intermittent Pressure	25 bar (3.625 psi) per stage
Rated Speed Range	200–1,500 rpm
Recommended Speed Range (High Viscosity)	200–600 rpm
Flow Rate (at 1,000 rpm, per stage)	12 L/min (3.17 gpm)
Total Flow Rate (at 1,000 rpm)	24 L/min (6.34 gpm)
Fluid Viscosity Range	1–20,000 cSt (0.001–20 Pa·s)
Fluid Temperature Range	-10°C to +200°C (14°F to 392°F)
Inlet/Outlet Port Size	G 1½” (DN40) per stage
Mounting Flange	Standard foot-mounted / flange-mounted options
Shaft Type	Common keyed drive shaft (Ø19 mm / Ø0.75 in)
Housing Material	Cast iron (standard); optional 304/316 stainless steel
Gear Material	High-strength alloy steel
Seal Options	Mechanical seal (standard); packing gland seal (optional)
Noise Level (at 1,000 rpm)	≤ 65 dB(A)
Efficiency (Volumetric)	≥ 90% at rated conditions

NCB2/2 Hydraulic Gear Pump Installation Dimensions：

Applications

Applications

The NCB2/2 series provides a compact, dual-circuit fluid transfer solution specifically tailored for systems requiring two independent flows from a single drive source, where space efficiency and reliable high-viscosity fluid handling are critical:

Industrial Process Systems:
Ideal for chemical processing, resin transfer, and paint circulation systems, where the tandem design delivers two independent flow rates for primary and auxiliary process lines, while its internal gear design ensures smooth, pulsation-free delivery of high-viscosity fluids.
Petrochemical & Oil Transfer:
Widely used for dual-line fuel oil, lube oil, and heavy crude transfer in refineries and bulk storage facilities, with separate circuits for continuous supply and auxiliary filtration or recirculation, eliminating the need for two separate pumps.
Food & Beverage Processing:
Suitable for handling syrups, chocolate, sauces, and other viscous food products in dual-line production setups (e.g., main process feed and CIP cleaning circuits), with optional stainless steel construction meeting sanitary requirements.
Polymer & Plastics Manufacturing:
Employed in plastic extrusion and injection molding systems to feed both the main polymer melt line and auxiliary additive injection circuits, maintaining precise, consistent flow even with high-viscosity polymers and temperature variations.
Mobile & Auxiliary Hydraulic Systems:
Used in heavy machinery and equipment for dual-circuit hydraulic power, such as primary implement functions and auxiliary steering or cooling circuits, leveraging the common shaft drive to reduce installation complexity and weight.
Wastewater & Sludge Handling:
Applied in sewage treatment plants for dual-line transfer of sludge, thickened waste, and chemical additives, with robust construction handling slightly contaminated, high-viscosity fluids common in municipal and industrial waste streams.

Vane Pump Application

Factory&FAQ

Packaging & Delivery

NCB2/2 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.

NCB2/2 Gear Pump FAQ:

1. What are NCB2/2 series gear pumps?

The NCB2/2 is a compact, fixed-displacement tandem internal gear pump, consisting of two independent NCB2 pumping stages mounted on a common drive shaft within a single housing. Engineered for high-viscosity fluid transfer and dual-circuit hydraulic systems, it provides two separate, synchronized flows from one power source, making it ideal for applications where space and drive power are limited.

2. What makes the NCB2/2 different from using two separate single pumps?

The NCB2/2 offers key advantages over using two individual pumps:

Integrated Compact Design: Eliminates the need for two separate pump bodies, couplings, and mounting hardware, drastically reducing installation footprint and weight.
Synchronized Operation: The common drive shaft ensures perfectly matched speed and flow between both circuits, preventing pressure imbalances in dual-line systems.
Simplified Installation: Only one drive connection and one mounting flange are required, reducing piping complexity, maintenance points, and potential leak paths.
Cost Efficiency: Lower overall system cost compared to purchasing and installing two separate pumps.

3. What is the working pressure range of NCB2/2 pumps?

The NCB2/2 is designed for reliable medium-pressure continuous duty in fluid transfer and hydraulic applications. Depending on fluid viscosity and model variant, the typical ratings are:

Continuous Pressure (per stage): Up to 20 bar (290 PSI).
Intermittent/Peak Pressure (per stage): Up to 25 bar (363 PSI).

This rating makes it ideal for process, chemical, and auxiliary hydraulic circuits requiring consistent, pulsation-free flow.

4. Can NCB2/2 pumps replace other brands?

Yes, the NCB2/2 is a high-quality, cost-effective alternative to many standard tandem internal gear pumps. It is commonly used as a direct replacement for:

Viking 2-2 Series Tandem Pumps
Zenith B-Series Dual-Stage Pumps
Standard cast-iron tandem internal gear pumps in similar frame sizes

To ensure a successful swap, verify the Mounting Configuration, Shaft Type, Displacement per stage, and Port Sizes to match your existing system.

5. What fluids are suitable for NCB2/2 gear pumps？

The NCB2/2’s internal gear design is optimized for a wide range of viscous fluids. The following is recommended:

Fluid Type: Oils, fuels, resins, polymers, paints, syrups, and other clean to slightly contaminated non-abrasive fluids.
Viscosity Range: 1 to 20,000 cSt (0.001 to 20 Pa·s). Optimal performance is achieved between 50 and 5,000 cSt.
Temperature Range: Standard models from -10°C to +200°C (14°F to 392°F); high-temperature options available.
Filtration: Cleanliness is vital for gear and bushing life. A minimum filtration of ISO 4406 18/16/13 is recommended to prevent abrasive wear.

6. What is the typical speed range of NCB2/2 pumps?

The operating speed is directly related to fluid viscosity. The recommended ranges are:

General Operation (≤ 1,000 cSt): 200 to 1,500 RPM.
High Viscosity (> 1,000 cSt): Reduced speed range of 200 to 600 RPM to maintain volumetric efficiency and prevent excessive wear.
Optimal Speed: 600 to 1,000 RPM for most common industrial fluids, balancing flow, noise, and service life.

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

NCB2/2 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.