NBZ4-D40F HANGFA Gear Pump | 40cc 25MPa Internal Gear

Product Overview

The NBZ4-D40F / D50F / D63F and NT5-D80F / D100F / D125F / D160F are high-performance straight conjugate internal gear pumps from the HANGFA (Shanghai Hangfa) series. Utilizing advanced straight conjugate internal gear tooth profile technology, this series represents a novel hydraulic power component with internationally advanced standards.

Compared to traditional vane pumps and piston pumps, this internal gear pump series delivers extremely low noise, zero pressure pulsation, and exceptionally long service life under high-pressure, high-speed, and high-power operating conditions. The NBZ4 series is classified as high-pressure type (rated 25MPa, peak 32MPa); the NT5 series is classified as medium-pressure type (rated 12.5MPa, peak 16MPa).

Engineered as a direct OEM-replacement solution for HANGFA original products, these models fully comply with original design standards and mounting interface specifications, offering 100% direct interchangeability. Every unit undergoes 100% workload simulation testing prior to shipment, rigorously validating pressure retention, volumetric efficiency, and internal leakage performance to meet or exceed OEM standards.

Model Code Breakdown :

• NBZ / NT — Series: HANGFA Internal Gear Pump Series

• 4 / 5 — Frame size: NBZ4 / NT5 Medium/Large Frame

• D — Pressure rating: D Series (Medium/High Pressure)

• 40 / 50 / 63 / 80 / 100 / 125 / 160 — Displacement code: Nominal displacement (ml/r)

• F — Mounting type: Flange connection

Technical Specifications

NBZ4 High-Pressure Series (D40F / D50F / D63F)

• Series: HANGFA NBZ4 Straight Conjugate Internal Gear Pump

• Pressure Rating: High-pressure type (rated 25MPa, 10s peak 32MPa)

• Displacement Options: NBZ4-D40F (40cc), NBZ4-D50F (50cc), NBZ4-D63F (63cc)

• Rated Speed: 1500 r/min

• Minimum Speed: 600 r/min

• Material: High-strength cast iron

• Operating Temperature: -20℃ to 80℃

• Recommended Media: #46 Anti-wear hydraulic oil

• Noise Level: Extremely low (straight conjugate internal gear design)

• Pressure Pulsation: Zero pressure pulsation

NT5 Medium-Pressure Series (D80F / D100F / D125F / D160F)

• Series: HANGFA NT5 Straight Conjugate Internal Gear Pump

• Pressure Rating: Medium-pressure type (rated 12.5MPa, 10s peak 16MPa)

• Displacement Options: NT5-D80F (80cc), NT5-D100F (100cc), NT5-D125F (125cc), NT5-D160F (160cc)

• Rated Speed: 1500 r/min

• Minimum Speed: 600 r/min

• Maximum Speed: 2000 r/min

• Material: High-strength cast iron

• Operating Temperature: -20℃ to 80℃

• Recommended Media: #46 Anti-wear hydraulic oil

• Noise Level: Extremely low (straight conjugate internal gear design)

• Pressure Pulsation: Zero pressure pulsation

Key Technical Advantages

1. Straight Conjugate Internal Gear Profile – Ultra-Low Noise Operation
The special straight conjugate tooth profile ensures smooth gear contact for silent operation. Even at high speeds, the sound remains stable and smooth. This series is recognized in the hydraulics industry as a “relatively quiet hydraulic pump”.

2. Oil Film Protection Under High Pressure – Extended Service Life
The pump forms an oil film to protect components from wear during 25MPa high-pressure operation, ensuring ultra-long service life. Straight conjugate internal gears are recognized as a low-wear pump type.

3. Zero Pressure Pulsation – Suitable for Precision Control
The special tooth profile design ensures virtually no oil trapping during operation, enabling high pressure while eliminating pressure pulsation. This makes it an ideal power source for system precision control.

4. Low Contamination Sensitivity – Strong Adaptability
Compared to vane pumps and piston pumps, internal gear pumps offer low contamination sensitivity, demonstrating stronger adaptability in industrial environments with fluctuating fluid cleanliness.

5. Flexible Port Configuration
NBZ4 / NT5 series offer four inlet/outlet port position options: 0°, 90°, 180°, and 270°. Ports are factory-set to customer requirements and should not be altered by users.

Application Areas

This internal gear pump series is widely used in the hydraulic systems of the following equipment:

• Injection Molding Machines: Stable, low-noise hydraulic power for injection and clamping processes

• Die Casting Machines: High-pressure, high-flow hydraulic systems

• Rubber Vulcanization Presses: Stable pressure holding

• Pipe Bending Machines and Press Brakes: Precise pressure and position control

• Shearing Machines: Reliable hydraulic power under high impact loads

• Construction Machinery and Mining Equipment: Travel and implement hydraulic systems

• Plastic Machinery and Metallurgical Machinery: Industrial hydraulic systems

• Electric Forklifts and Material Handling Equipment: Logistics and handling equipment hydraulics

Expert Maintenance Tips

1. Model Confirmation
The NBZ4 series is high-pressure type (25MPa), while the NT5 series is medium-pressure type (12.5MPa). Before installation, confirm the correct series based on system pressure requirements and verify the complete model code on the pump nameplate.

2. Rotation Direction Confirmation
Before installation, jog the motor to check rotation direction and verify that the PTO rotation matches the pump’s rotation direction—stop immediately if the direction is incorrect, as continued operation will cause pump wear and burn-out.

3. Installation Precautions

• Thoroughly clean the mounting flange and shaft mating surfaces before installation to ensure no debris remains

• Mounting type is flange connection (F-type)

• Install a filter on the inlet line with flow capacity exceeding the pump’s flow rate

• Do not reverse the inlet and outlet port connections

• Ports are factory-set to customer requirements—do not alter port positions

4. First Start-Up and Bleeding

• Before first start-up, must fill the pump with hydraulic oil through the inlet port—never start dry

• Manually rotate the coupling during initial start-up; rotation should feel uniform and smooth

• During initial start-up or after extended downtime, air suction may occur—install an air bleed valve at the outlet port or loosen outlet flanges/fittings to purge air

• Perform test operation under no-load conditions whenever possible

5. Fluid and Filtration

• Use #46 anti-wear hydraulic oil

• Maintain system oil cleanliness to ISO 4406 18/15 or better

• Internal gear pumps have certain cleanliness requirements—regularly replace return line filters

6. Periodic Maintenance

• Check mounting bolt torque every 1,000 operating hours

• Regularly monitor system operating pressure—NBZ4 series not to exceed 25MPa (peak 32MPa); NT5 series not to exceed 12.5MPa (peak 16MPa)

• If flow output decreases, noise levels increase abnormally, or system temperature rises excessively, inspect and replace worn components promptly