High-Pressure Gear Pump AT331223 Tandem Oil Pump

High-Pressure Gear Pump AT331223 Tandem Oil Pump

2 week ago

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 3 year year

Product details

1. Product Overview

TheAT331223 Tandem High-Pressure Gear Pumpis a dual-pump串联 (tandem) hydraulic gear pump designed for industrial and agricultural machinery requiring high flow and pressure outputs, such as loaders, excavators, and road rollers. Its tandem structure enables dual-stage pressure or flow叠加 (superposition) under a single input, meeting complex hydraulic system demands.

2. Technical Specifications

【表格】

Parameter Description

Model AT331223 (tandem dual-pump configuration)

Displacement Single pump: 16.56 cm³/rev (total 33.12 cm³/rev in tandem mode)

Rated Pressure 25 MPa (continuous operation)

Peak Pressure 31.5 MPa (short-term allowable)

Speed Range 600–2,500 rpm (optimal efficiency: 1,500–2,000 rpm)

Flow Range 10–83 L/min (variable with speed)

Weight Approx. 12 kg (including mounting flange)

Fluid Mineral-based hydraulic oil (viscosity grade ISO VG 32–68), -20°C to +80°C

Ports SAE O-ring ports (#10 or #12, configurable)

3. Structural Features

• Tandem Dual-Pump Design:

• Two gear pumps coaxially connected in series, with the primary pump driving the secondary pump for pressure/flow superposition.

• Ideal for staged pressure supply (e.g., pilot control + main circuit).

• High-Precision Gear Pair:

• Helical or herringbone gears reduce noise (≤75 dB) and pulsation.

• Gear surfaces carburized and quenched to HRC58-62, improving wear resistance by 30%.

• Integrated Relief Valve:

• Built-in overflow valve prevents overpressure (adjustable, default 28 MPa).

• Sealing System:

• Dual-lip fluororubber shaft seals prevent leakage; O-rings seal casing joints.

4. Performance Advantages

• High-Pressure Output:

• Tandem operation achieves 31.5 MPa, suitable for heavy-duty lifting/rotating.

• Stable Flow:

• Gear meshing precision ensures ≤5% flow pulsation for precise hydraulic control.

• Energy Efficiency:

• Volumetric efficiency ≥92%, mechanical efficiency ≥90%, total efficiency ≥83% (at 2,000 rpm).

• Compact Design:

• Axial length reduced by 40% vs. parallel dual-pump setups, saving installation space.

5. Applications

• Construction Machinery:

• Loader boom/bucket hydraulic systems.

• Excavator swing motor supply.

• Agricultural Machinery:

• Combine harvester header lift/thresher drive.

• Tractor rear suspension systems.

• Industrial Equipment:

• Injection molding machine clamping units.

• Die-casting machine platen movement.

6. Installation & Maintenance

• Installation Requirements:

• Align pump shaft with driver motor (coaxiality error ≤0.05 mm) to avoid vibration.

• Equip hydraulic system with filters (≤10 μm) and coolers (oil temp ≤65°C).

• Maintenance Schedule:

• Inspect oil cleanliness every 500 hours; replace hydraulic oil if needed.

• Replace shaft seals and bearings every 2,000 hours (if leakage/noise occurs).

• Troubleshooting:

• Insufficient Flow: Check gear wear, inlet blockage, or low speed.

• Excessive Noise: Investigate gear misalignment, bearing damage, or air ingestion.

• Leakage: Replace seals or inspect casing for cracks.

7. Selection Guidelines

• Pressure Priority: Choose tandem configuration for systems requiring >25 MPa continuous pressure; adjust relief valve settings accordingly.

• Flow Matching: Calculate total flow (Q = displacement × speed ÷ 1,000) based on cylinder/motor requirements.

• Environmental Adaptation:

• High-temperature (>60°C) operations: Use heat-resistant fluororubber seals.

• Cold starts (<-20°C): Preheat hydraulic oil to ≥10°C.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 Audited supplier

3 year

Address: Ningbo, China

Main Product: hydraulic motor, gear box, hydraulic pump, hydraulic valve , hydraulic winch, hydraulic system

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