VPPM-029PQC-L55T/10N000 Duplomatic Pump 29cc 280bar Variable Piston

Product Overview

The VPPM-029PQC-L55T/10N000 is a member of the Duplomatic VPPM Series swashplate-type axial piston variable displacement pump family, with a maximum displacement of 29 cm³/rev, designed for open-circuit medium-to-high pressure industrial and mobile hydraulic systems.

The VPPM Series represents Duplomatic’s versatile axial piston pump platform for medium-to-high pressure applications, widely deployed in injection molding machines, presses, construction equipment, and material handling machinery. The series offers four sizes — 029, 046, 073, and 087 — with displacements ranging from 29 to 87 cm³/rev. This model is specifically equipped with PQC flow-pressure compound control (load sensing), delivering precise flow and pressure matching for on-demand oil supply and superior energy efficiency.

Engineered as a premium drop-in replacement for Duplomatic original hydraulic pumps, this unit strictly adheres to VPPM Series design standards and manufacturing specifications, ensuring complete interchangeability — mounting flange interfaces, port configurations, and control logic are fully compatible with the original OEM model, requiring zero field modification for direct replacement.

Every unit undergoes 100% simulated duty-cycle testing — full performance curve validation under rated pressure, rated speed, and expected operating temperature ranges — guaranteeing volumetric efficiency, response characteristics, and noise levels that meet or exceed Duplomatic factory specifications.

Technical Specifications 

• Model Code: VPPM-029PQC-L55T/10N000

• Series: Duplomatic VPPM Series, Swashplate Axial Piston Variable Displacement Pump

• Maximum Displacement: 29 cm³/rev

• Rated Operating Pressure (Continuous): 280 bar

• Intermittent Operating Pressure: 315 bar

• Peak Pressure: 350 bar

• Maximum Speed (at full displacement): 3000 rpm

• Control Type: PQC — Flow-Pressure Compound Control (Load Sensing)

• Rotation Direction: L — Counterclockwise (viewed from shaft end)

• Mounting Flange: ISO 3019/2 Standard Flange

• Shaft Type: As defined by 55T model code segment

• Port Connections: SAE Flange Connections

• Circuit Type: Open Circuit

• Ambient Temperature Range: -15°C to +70°C

• Fluid Temperature Range: -25°C to +80°C

• Recommended Fluid Viscosity: 15-35 cSt

• Weight: Approx. 18 kg

Key Technical Advantages

1. Swashplate Variable Design & High Volumetric Efficiency

The proven swashplate axial piston design enables stepless displacement adjustment by varying the swashplate angle. Output flow is proportional to speed and swashplate angle, with continuous adjustability. Optimized piston-slipper friction pairs and precision port plates deliver excellent volumetric efficiency across the full pressure range.

2. PQC Flow-Pressure Compound Control (Load Sensing)

This model is equipped with PQC flow-pressure compound control, integrating both flow regulation and pressure compensation functions. The system automatically adjusts pump output flow and pressure based on load demand, achieving “on-demand oil supply” — automatically reducing displacement during standby or light-load conditions to significantly minimize energy losses and system heat generation.

3. High Shaft Load Capacity & Extended Service Life

VPPM Series pumps feature reinforced construction capable of withstanding high axial and radial shaft loads. High-strength housings and precision bearing systems ensure long-term stable operation at 280 bar continuous and 350 bar peak pressures. Large-diameter main shafts and heavy-duty bearing configurations significantly extend service life.

4. Low Noise Design & Smooth Operation

Optimized swashplate angle transition geometry and nine-piston configuration effectively reduce output flow pulsation and pressure fluctuations. Continuous stepless adjustment enables smooth flow transition from zero to maximum, ensuring precise and stable actuator motion with low noise and minimal impact.

5. Complete Drop-In Interchangeability & Standardized Interfaces

Strictly manufactured to original Duplomatic VPPM Series design specifications and micron-level tolerances. ISO 3019/2 standard mounting flanges and SAE standard port configurations align flawlessly with original factory specifications. Field replacement requires zero piping modifications or control logic changes, dramatically minimizing equipment downtime.

6. Wide Speed Range & Flexible Installation

Maximum speed reaches 3000 rpm at full displacement, with minimum stable speeds below 500 rpm, accommodating everything from low-speed fine adjustment to high-speed high-flow conditions. Supports both horizontal and vertical mounting orientations.

Application Areas

• Injection Molding Machines

• Hydraulic Presses & Stamping Equipment

• Construction Equipment Hydraulics

• Material Handling & Lifting Equipment

• Industrial Power Units

• Machine Tool Hydraulics

• Metallurgical Equipment

Expert Maintenance Tips

1. Case Fill Before Start-up

Prior to first start-up, fill the pump housing with clean hydraulic fluid through the case drain port to ensure complete pre-lubrication of all bearings and rotating components. For the “L” counterclockwise rotation configuration, pay special attention to matching rotation direction with system piping.

2. Fluid Cleanliness Management

VPPM Series pumps are precision hydraulic components sensitive to fluid contamination. Maintain system fluid cleanliness per recommended specifications. Use return-line filters with minimum 10μm absolute rating (β₁₀≥100) and conduct regular fluid sampling analysis (recommended every 500 operating hours).

3. PQC Control Setting & Calibration

PQC flow-pressure compound control settings should be adjusted after the pump reaches operating temperature and the system is fully purged. Flow and pressure settings should be calibrated per equipment manufacturer recommended values. Adjust slowly to avoid pressure or flow overshoot.

4. Viscosity & Temperature Monitoring

Ensure operating fluid viscosity remains within the recommended range (15-35 cSt). For cold starts, only apply load after fluid temperature reaches above -15°C. Install continuous oil temperature monitoring to ensure fluid temperature does not exceed 80°C.

5. Scheduled Inspection & Seal Replacement

Perform comprehensive performance testing every 2000 operating hours or annually (whichever comes first), including volumetric efficiency testing, PQC control response time verification, and case drain leakage assessment. Always use genuine Duplomatic service kits when replacing seals, and verify that seal material options in the model code are compatible with the system fluid type.