HGP-22 Series Duplex Gear Pump

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Product details

HGP-22 Series Duplex Gear Pump

This is a classic external meshing duplex gear pump widely used in hydraulic industry, originally designed to Taiwan standard. It features compact structure, stable performance and high interchangeability, commonly applied in machine tools, injection molding machines and light construction machinery.

1. Model Code Definition (Example: HGP-22A-F1111R)

1. HGP: Series code for external gear pump

2. 22: Duplex structure with two HGP-2 pump bodies

3. A: Aluminum alloy flange mounting (standard)

4. F: Flange port; no letter indicates threaded port

5. 11/11: Displacement of front and rear pump, unit: mL/r

6. R: Rotation direction, R=clockwise, L=counterclockwise

2. Technical Specifications

- Pump Type: Fixed displacement external meshing duplex gear pump

- Rated Pressure: 16MPa

- Max. Intermittent Pressure: 21MPa

- Recommended Speed: 1200~2500 r/min

- Volumetric Efficiency: ≥90%

- Working Medium: 46# / 68# anti-wear hydraulic oil

- Operating Temperature: 0℃ ~ 60℃

- Housing Material: Die-cast aluminum alloy

3. Main Displacement Combinations

F0808, F1111, F1212, F1717, F2222, F2525

4. Structural Advantages

1. Floating side plate design for automatic axial clearance compensation

2. DU self-lubricating bushing for low noise and long service life

3. Coaxial integrated drive with two independent oil outlets

4. Compact size, universal installation dimension

5. High cost performance and easy availability

5. Typical Applications

Injection molding machine, die casting machine, hydraulic power unit, woodworking machinery, lifting platform and light agricultural machinery.

HGP-22 Series Duplex Gear Pump

TheHGP-22 Series Duplex Gear Pumpis a high-performance hydraulic power unit that integrates a dual-pump structure with precision manufacturing, suitable for industrial applications requiring synchronized or independent control of multiple actuators. Below is a detailed overview of its key features and applications:

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I. Technical Characteristics

1. Duplex Structure

• Comprises two independent gear pumps (front pump F2/rear pump F3) connected in series or parallel, enabling combined flow or pressure output.

• Supports synchronized operation (e.g., dual-cylinder lifting) or independent operation (e.g., branch circuits with varying pressure demands), meeting complex hydraulic system control requirements.

2. High-Strength Materials

• Pump body extruded from high-tensile aluminum alloy, with front/rear covers produced via die-casting for structural integrity and lightweight design.

• Nitrided gears and shafts with high surface hardness and excellent wear resistance, extending service life.

3. Efficient Sealing Technology

• VITON oil seals for superior high-temperature resistance (e.g., metallurgical equipment applications).

• Floating bushing and DU bearing design minimize internal leakage, achieving volumetric efficiency ≥90% under rated conditions.

4. Low-Noise Operation

• Precision gear meshing ensures smooth operation, with noise levels ≤75 dB(A), complying with industrial noise standards.

5. Modular Design

• Supports multi-pump combinations (e.g., triplex pump CBW-F3/F3/F3) and compatibility with SAE, DIN, or European standard interfaces for simplified system integration.

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II. Applications

1. Construction Machinery

• Excavators: Powers slewing platforms and travel motors for precise control of compound motions.

• Cranes: Provides independent pressure sources for luffing mechanisms and winches, enhancing operational safety.

• Loaders: Synchronizes work device and steering system control for improved efficiency.

2. Agricultural Machinery

• Combine Harvesters: Drives header lifting and conveyor chains for adaptive operation on uneven terrain.

• Tractors: Supports hydraulic hitch systems and power take-offs (PTOs).

3. Industrial Equipment

• Injection Molding Machines: Delivers high-pressure hydraulic power to clamping units and injection systems for precise molding.

• Die-Casting Machines: Powers lock molds and injection systems for high-temperature metal filling.

4. Marine & Vehicles

• Deck Machinery: Drives windlasses and winches, withstanding corrosive marine environments.

• Engineering Vehicles: Provides stable power for dump truck lifting systems under heavy-load conditions.

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III. Performance Parameters (HGP-22A Example)

【表格】

Parameter Description

Displacement Front pump F2: 2 mL/r; Rear pump F3: 3 mL/r (varies by model)

Rated Pressure 16 MPa (up to 20 MPa for select models)

Peak Pressure 25 MPa (short-term overload allowance)

Speed Range 500–2,500 r/min (compatible with motor or diesel engine direct drive)

Volumetric Efficiency ≥90% (under rated conditions)

Drive Method Direct coupling to motor or engine; supports bidirectional rotation

Mounting Type Flange or foot-mounted for easy hydraulic system integration

Fluid Temperature -20°C to +80°C (extended to +120°C for high-temperature models)

Applicable Media Anti-wear hydraulic oil (viscosity grade N32–N68)

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IV. Maintenance Recommendations

1. Hydraulic Oil Management

• Replace hydraulic oil after the first 500 operating hours, then every 2,000 hours thereafter. Avoid contamination to prevent seal failure.

• Use only specified viscosity-grade hydraulic oil; do not mix different brands or types.

2. Installation & Alignment

• Ensure pump shaft and drive shaft alignment error ≤0.1 mm to prevent bearing wear-induced vibration or noise.

• Optimize inlet piping design to reduce suction resistance. Position inlet below oil tank liquid level or install an auxiliary suction pump.

3. Operational Monitoring

• Regularly check pump surface temperature (≤80°C) and inlet/outlet pressure differential (normal value ≤1.5 MPa).

• Immediately halt operation if abnormal noise, pressure fluctuations, or leaks occur.

4. Long-Term Storage

• Drain hydraulic oil and apply anti-rust oil if shutdown exceeds 30 days to prevent internal corrosion.