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NCB4 Positive Displacement Gear Pump

The NCB4 is a compact positive displacement internal gear pump designed for high‑viscosity fluids. It features an inner/outer gear set with a crescent separator, enabling smooth, pulse‑free flow and strong self‑priming capability. Ideal for oils, resins, paints, and chemicals (viscosity up to 300,000 cSt), it operates bidirectionally with low noise and high efficiency. Widely used in chemical, petroleum, and food industries.

Model:
NCB4
Brand:
Green Hydraulic
Model Number:
NCB4
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

NCB4 Gear Pump Overview

The NCB4 is a compact, fixed-displacement positive-displacement internal gear pump engineered for reliable, pulse-free fluid transfer in systems requiring consistent flow at varying viscosities. Featuring a robust cast iron construction and precision-machined gear set, the NCB4 is specifically designed to deliver high volumetric efficiency with low noise and minimal pulsation, making it an ideal choice for chemical, petroleum, and general industrial applications where performance and dependability are critical.

NCB4

Features and Benefits

Robust Internal Gear Design:
The NCB4 utilizes an internal/external gear configuration with a crescent separator, delivering inherently smooth, pulsation-free flow compared to external gear alternatives. This design reduces fluid turbulence and noise, ensuring consistent performance even with high-viscosity fluids.
High Viscosity Compatibility:
Optimized for handling a wide range of viscosities (up to 300,000 cSt), the NCB4 excels at transferring oils, resins, paints, and other thick fluids without sacrificing efficiency. Its generous clearances prevent cavitation and wear in challenging media conditions.
Strong Self-Priming & Bi-Directional Operation:
With excellent self-priming capability and bi-directional rotation compatibility, the NCB4 offers flexible installation and system design options. It can handle suction lifts effectively, eliminating the need for complex priming systems in most applications.
Compact & Durable Construction:
Built with heavy-duty cast iron bodies and precision-machined components, the NCB4 provides superior structural rigidity and resistance to mechanical fatigue. Its simple, proven design ensures long service life with minimal maintenance requirements.
Versatile Mounting & Configuration:
The NCB4 supports standard mounting options and multiple port configurations (side/rear) to suit cramped installation spaces. Its modular design allows for easy integration into both new and existing fluid transfer systems, offering unmatched adaptability for specialized industrial setups.

Specifications

Model Codes

Technical Data

Parameter	Specification
Type	Positive Displacement Internal Gear Pump
Displacement	4 cc/rev (nominal)
Rated Flow Rate	0.24–1.2 m³/h (1.0–5.3 gpm) at 60–300 RPM
Maximum Continuous Pressure	0.6 MPa (6 bar / 87 psi)
Maximum Intermittent Pressure	1.0 MPa (10 bar / 145 psi)
Speed Range	60–600 RPM (optimal: 100–300 RPM)
Fluid Viscosity Range	1–300,000 cSt
Operating Temperature Range	-20°C to +120°C (-4°F to +248°F)
Port Configuration	Side / rear ports (optional), flanged or threaded connections
Inlet/Outlet Size	½” to 1” (DN15–DN25, nominal)
Body Material	Cast iron (standard), stainless steel (optional)
Gear Material	Alloy steel, heat-treated
Shaft Sealing	Mechanical seal or packing gland
Self-Priming Capability	Up to 5 m (16 ft) static lift (with primed pump)
Direction of Rotation	Bi-directional (clockwise / counterclockwise)
Mounting Options	Foot-mounted or flange-mounted
Weight (approx.)	10–15 kg (22–33 lbs)

NCB4 Hydraulic Gear Pump Installation Dimensions：

Applications

Applications

The NCB4 series provides a compact, reliable positive‑displacement internal gear pump solution tailored for fluid transfer and metering applications where consistent flow, high viscosity compatibility, and low pulsation are critical.

Industrial Fluid Transfer:
Ideal for transferring oils, lubricants, and hydraulic fluids in general manufacturing and machine tool systems, where its smooth, pulse‑free flow ensures stable process conditions.
Chemical & Petrochemical Processing:
Well‑suited for handling resins, paints, solvents, and other viscous or semi‑viscous chemicals. Its robust cast iron construction and precision‑machined gears offer excellent resistance to wear and thermal shock in continuous‑cycle operations.
Food & Beverage Processing:
(With food‑grade seal options) Used for pumping syrups, chocolate, edible oils, and other high‑viscosity food products, maintaining sanitary flow with minimal shear or degradation of sensitive media.
Lubrication & Oil Circulation Systems:
Commonly deployed in central lubrication systems, gearboxes, and engine oil circuits, providing consistent, low‑noise flow to maintain equipment lubrication and reduce maintenance downtime.
Wastewater & Sludge Handling:
Capable of handling light sludges, oily water mixtures, and other contaminated fluids, with its generous internal clearances reducing the risk of clogging in moderate solids environments.
Agricultural & Farm Equipment:
Used in fertilizer transfer, pesticide metering, and farm machinery lubrication systems, where its self‑priming capability and tolerance to variable operating conditions make it dependable in outdoor environments.

Factory&FAQ

Packaging & Delivery

NCB4 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.

NCB4 Gear Pump FAQ:

1. What are NCB4 series gear pumps?

The NCB4 is a compact, fixed-displacement positive-displacement internal gear pump. Built with a robust cast iron body and precision-machined gear set, it is specifically engineered for reliable, low-pulsation fluid transfer and metering in industrial systems that handle oils, chemicals, and high-viscosity fluids.

2. What makes the NCB4 different from standard external gear pumps?

The NCB4’s internal gear design offers key advantages in demanding applications:

Low Pulsation Flow: The crescent-style internal gear configuration delivers inherently smoother, quieter flow than external gear pumps, reducing system vibration and noise.
High Viscosity Compatibility: Its generous clearances and low-shear design handle thick fluids (up to 300,000 cSt) more efficiently than most external gear pumps, even at low speeds.
Bi-Directional Operation: Unlike many external gear pumps, the NCB4 can run clockwise or counterclockwise, offering greater flexibility for system design and reversing applications.

3. What is the working pressure range of NCB4 pumps?

The NCB4 is optimized for medium-pressure fluid transfer applications:

Continuous Pressure: Up to 6 bar (0.6 MPa / 87 psi).
Intermittent/Peak Pressure: Up to 10 bar (1.0 MPa / 145 psi).

This pressure rating makes it ideal for lubrication, chemical transfer, and general industrial fluid handling systems.

4. Can NCB4 pumps replace other brands?

Yes, the NCB4 is a reliable, cost-effective alternative to many popular internal gear pumps. It is often used as a replacement for:

Viking® Internal Gear Pumps (SG4 series).
Blackmer® G Series Internal Gear Pumps.
IMO® Ace Series Pumps.

To ensure a successful swap, verify the Mounting Configuration, Port Size & Orientation, Displacement, and Shaft Type to match your existing system.

5. What fluids are suitable for NCB4 gear pumps？

To protect the pump’s gears, bushings, and seals, the following is recommended:

Fluid Compatibility: Mineral oils, synthetic oils, lubricants, resins, paints, solvents, and food-grade media (with appropriate seal upgrades).
Viscosity Range: 1–300,000 cSt. Optimal performance is achieved at 10–10,000 cSt.
Filtration: A minimum filtration of ISO 4406 18/16/13 is recommended for most applications to prevent abrasive particles from damaging the gear faces and seals.

6. What is the typical speed range of NCB4 pumps?

The NCB4’s speed is matched to fluid viscosity for optimal performance:

General Operation: 60–600 RPM.
Optimal Speed: 100–300 RPM (balances efficiency, wear, and noise for most fluids).
For high-viscosity fluids (>10,000 cSt): Reduced speeds (60–150 RPM) are recommended to prevent cavitation and excessive torque.

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

NCB4 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.