1. Model Nomenclature

• GHP: Series identifier, indicating a high-pressure external gear pump designed for heavy-duty hydraulic systems.
• 3A: Size group, which determines the basic installation dimensions and maximum displacement range of the pump. The 3A group belongs to the GHP3 series, suitable for medium to high flow requirements.
• D: Mounting type, representing flange mounting (alternative: S for shaft extension mounting) with clockwise rotation by default.
• 20: Displacement, with a nominal displacement of 20 cm³/rev (cubic centimeters per revolution).
• FG: Special option, indicating mechanical seal (G) configuration, which enhances wear resistance and corrosion resistance, suitable for various industrial hydraulic media. The port is equipped with BSP cylindrical pipe threads.

2. Basic Parameters

3. Performance Parameters

• Pressure Rating
  • Maximum Continuous Pressure: 280 bar
  • Maximum Intermittent Pressure: 295 bar (intermittent operation time not exceeding 10% of total working time)
  • Peak Pressure: 310 bar (short-term peak, not for continuous operation)
• Speed Range
  • Maximum Speed: 3500 rpm
  • Minimum Speed: 500 rpm (to ensure sufficient lubrication and avoid cavitation)
• Operating Temperature Range: -20 °C to +80 °C (ambient temperature; fluid temperature should not exceed 70 °C for long-term stable operation).
• Viscosity Range: 10 to 1500 cst (hydraulic fluid viscosity, optimal range: 20-400 cst).

4. Structural & Material Specifications

• Pump Body Material: High-strength cast iron, ensuring structural rigidity and wear resistance under high-pressure working conditions.
• Flange & Cover Material: Aluminum alloy, balancing lightweight and structural strength.
• Gear Material: Precision-machined alloy steel,经过 hardening treatment to reduce wear and ensure high volumetric efficiency.
• Seal Type: Mechanical seal (FG option), with excellent sealing performance to prevent hydraulic fluid leakage and adapt to various hydraulic media.
• Shaft Configuration: Tapered shaft with keyway (1:8 taper), standard configuration for stable power transmission.

5. Installation Specifications

• Flange Standard: European standard flange, ø50.8 mm (128×98 mm), compatible with standard industrial mounting dimensions.
• Port Specifications: Standard 3/4" BSP cylindrical pipe threads, thread depth 19 mm, ensuring reliable connection with hydraulic pipelines.
• Mounting Orientation: Horizontal mounting is recommended; vertical mounting is allowed under specific working conditions (please refer to the official manual for details).

6. Recommended Operating Conditions

• Hydraulic Fluid: Recommended to use anti-wear hydraulic oil (ISO VG 32 or ISO VG 46) that meets industrial standards; avoid using contaminated or expired hydraulic fluid.
• Filtration Requirement: The hydraulic system should be equipped with a proper filtering unit to ensure the cleanliness of the hydraulic fluid, reducing pump wear and extending service life.
• Pipeline Design: Avoid fluid turbulence in the intake, delivery, and return pipes; prevent air, water, or foreign bodies from entering the system to avoid damage to the pump.

7. Standard Accessories

• Standard pump shaft wrench (code: 522058)
• M14×1.5 external angle nut (code: 523017)
• Washer (code: 5230061)

8. Application Scope