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External Gear Pumps

HGP Series External Gear Pumps

The HGP series external gear pump is a hydraulic power component specifically designed for industrial applications. It features a classic external gear structure, with high reliability, wide adaptability, and long lifespan as its core advantages. Its compact design and precision manufacturing process make it an ideal power source for construction machinery, metallurgical equipment, hydraulic systems, and other fields, especially suitable for complex working conditions requiring medium-to-high pressure and high flow.

  • Single Gear Pump
  • Double Gear Pump
Single Gear Pump
HGP-1A Single Gear Pumps
HGP-1A Single Gear Pumps
Model Displacement
(cc/rev)
Operating pressure (bar) Rotation speed (rpm) Weight (kg)
Rated pressure Peak pressure Rated Min. Max.
HGP-1A-F1 1 210 250 1800 1000 4500 1
HGP-1A-F2 2 600 4500 1.05
HGP-1A-F3 3 600 4500 1.15
HGP-1A-F4 4 600 4500 1.18
HGP-1A-F5 5 600 3200 1.2
HGP-1A-F6 6 600 3200 1.3
HGP-1A-F8 7, 8 175 210 600 3200 1.4
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HGP-2A Single Gear Pumps
HGP-2A Single Gear Pumps
Model Displacement
(cc/rev)
Operating pressure (bar) Rotation speed (rpm) Weight (kg)
Rated pressure Peak pressure Rated Min. Max.
HGP-2A-*2* 2 210 250 1800 900 5000 1.69
HGP-2A-*3* 3 850 5000 1.70
HGP-2A-*4* 4 800 4500 1.71
HGP-2A-*5* 5 700 3500 1.71
HGP-2A-*6* 6 700 3500 1.72
HGP-2A-*8* 7.5 600 3000 1.74
HGP-2A-*9* 9 550 2500 1.74
HGP-2A-*11* 10.5 500 2000 1.74
HGP-2A-*12* 12 175 210 500 2000 1.76
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HGP-3A Single Gear Pumps
HGP-3A Single Gear Pumps
Model Displacement
(cc/rev)
Operating pressure (bar) Rotation speed (rpm) Weight (kg)
Rated pressure Peak pressure Rated Min. Max.
HGP-3A-*6* 6 210 250 1800 700 3000 2.32
HGP-3A-*8* 8 2.40
HGP-3A-*11* 11 600 2.53
HGP-3A-*13* 13 2.60
HGP-3A-*14.3* 14.3 500 2.69
HGP-3A-*15.6* 16.5 2.81
HGP-3A-*19.2* 19.2 2.92
HGP-3A-*23* 23 3.11
HGP-3A-*25* 25 175 210 3.20
HGP-3A-*28* 28 3.29
HGP-3A-*30* 30 3.38
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Double Gear Pump
HGP-1A Single Gear Pumps
HGP-11A Double Gear Pumps
Model Displacement
(cc/rev)
Operating pressure (bar) Rotation speed (rpm) Weight (kg)
Rated pressure Peak pressure Rated Min. Max.
HGP-11A-F1 1+1 210 250 1800 1000 4500 1
HGP-11A-F2 2+2 600 4500 1.05
HGP-11A-F3 3+3 600 4500 1.15
HGP-11A-F4 4+4 600 4500 1.18
HGP-11A-F5 5+5 600 3200 1.2
HGP-11A-F6 6+6 600 3200 1.3
HGP-11A-F8 8+8 175 210 600 3200 1.4
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HGP-22A Double Gear Pumps
HGP-22A Double Gear Pumps
Model Displacement
(cc/rev)
Operating pressure (bar) Rotation speed (rpm)
Rated pressure Peak pressure Rated Min. Max.
HGP-22A-F2 2+2 210 250 1800 900 5000
HGP-22A-F3 3+3 850 5000
HGP-22A-F4 4+4 800 4500
HGP-22A-F5 5+5 700 3500
HGP-22A-F6 6+6 700 3500
HGP-22A-F8 8+8 600 3000
HGP-22A-F9 9+9 550 2500
HGP-22A-F11 11+11 500 2000
HGP-22A-F12 12+12 175 210 500 2000
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HGP-33A Double Gear Pumps
HGP-33A Double Gear Pumps
Model A1/A2 B1/B2
HGP-33A-*4+4* 45.8 93
HGP-33A-*6+6* 47.3 96
HGP-33A-*8+8* 48.8 99
HGP-33A-*11+11* 51.3 104
HGP-33A-*13+13* 53.3 107
HGP-33A-*17+17* 56.3 114
HGP-33A-*19+19* 58.3 118
HGP-33A-*23+23* 61.8 125
HGP-33A-*25+25* 63.3 128
HGP-33A-*28+28* 65.3 132
HGP-33A-*30+30* 67.3 136
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Core Design Highlights
  • Precision Meshing Technology
    1. Gears are made from high-strength alloy steel treated with carburizing and quenching, combined with an ultra-fine grinding process. This ensures a meshing clearance of ≤0.02mm, reducing internal leakage, and achieving a volumetric efficiency of over 95%.
    2. Optional involute/double circular arc tooth profiles balance noise and pulsation, adapting to different application needs.
  • Low-Friction, Long-Lasting Sealing
    1. Equipped with a multi-layer composite material shaft seal and self-adaptive end face compensation structure. It has a temperature resistance range of -20℃ to +120℃ and strong anti-contamination capabilities, operating stably with a filtration precision of 10μm, extending lifespan by 30%.
Industry Application Scenarios
  • Construction machinery: Hydraulic power units for excavators, enabling precise flow control.
  • Shipbuilding heavy industry: Hydraulic systems for deck machinery, with salt spray corrosion-resistant design.
  • Intelligent manufacturing: High-frequency start-stop scenarios in automated production lines.
How does the high-pressure gear pump perform under high-temperature and high-pressure conditions in metallurgy, die-casting, and similar applications?

The high-pressure gear pump uses a high-grade aluminum alloy body and is equipped with oil-less bearings and Viton oil seals. It can operate normally in both forward and reverse directions under high temperatures and pressures without leakage, offering superior high-temperature resistance.

In a hydraulic system, how does the high-pressure gear pump ensure flow stability?

The high-pressure gear pump employs a dual-pump collaborative design, integrating two independent pump bodies. This allows it to simultaneously provide stable flow to multiple hydraulic circuits, optimizing system efficiency and ensuring uniform, continuous fluid delivery, adapting to the precise control needs of multi-circuit hydraulic systems.

How does the industrial gear pump ensure stability and service life in high-pressure environments?

Our gear pumps feature an oil-less bearing structure design, ensuring stable operation at pressures above 210 bar. This design also maintains internal lubrication within the pump, guaranteeing minimal wear and a longer service life.

When used with hydraulic motors, electric motors, and similar equipment, which type of gear pump is recommended?

When used with hydraulic motors, electric motors, and similar equipment, we recommend using flange-type gear pumps with a parallel key shaft for greater installation flexibility.

In multi-circuit hydraulic systems, how does the double high-pressure gear pump achieve stable oil supply?

The double high-pressure gear pump utilizes two independent pump chamber designs, capable of providing constant flow to two separate hydraulic circuits. This is particularly suitable for high-load conditions and extreme situations, ensuring smooth operation of the hydraulic system.

Which type of gear pump can be recommended for hydraulic systems with limited space?

For hydraulic systems with limited space, a double pump can be chosen. It integrates two gear pumps into a single unit, occupying less space while operating collaboratively for higher efficiency.

In hydraulic systems with relatively simple functions (e.g., hydraulic lifting, hydraulic clamping operations), what type of gear pump is recommended?

For hydraulic systems with relatively simple functions, where requirements are straightforward and typically involve a single flow output for a specific operation, a single gear pump can be chosen.

Focus on the design and manufacturing of hydraulic pumps and valves

NOAH offers a range of hydraulic products including hydraulic gear pumps, hydraulic vane pumps, hollow shaft electric motors for hydraulic pump, and hydraulic valves. We are committed to providing one-stop service to meet the demands of diverse industries such as construction machinery, machine tools, mining and metallurgy, automotive, and agricultural machinery.

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