Gear oil pump QX Series QX42-025/22-008R

Product Description

The quality Gear oil pump QX Series QX42-025/22-008R is engineered by Hengmeisi – a leading China manufacturer and factory direct supplier – to replace separated single gear pumps with graded dual-pressure technology. Rated at 240bar continuous, 325bar peak pressure, this model delivers higher volumetric efficiency (93.5%), lower pulsation (≤1.9%), and built-in inner unloading passage for mid-end precision hydraulic applications.

Product Advantages

Medium-Ultrahigh Compound vs Equal-Spec Dual Gear Pump Designs

Unlike twin equal-displacement tandem gear pumps or separate single pump combinations, the Gear Pump QX42-025/22-008R uses graded medium&micro plunger in a precision split cylinder. This eliminates redundant power loss and cross-pressure interference, enabling far higher clamping capacity and energy-saving efficiency.

Integrated Internal Unloading Passive Control

The built-in precast unloading channel receives pressure feedback to automatically open for medium-pressure cavity relief from 0 to full working load. Displacement deviation is automatically compensated, ensuring stable output – a leap beyond external valve-limited adjustments.

Premium Graded Materials for Extreme Durability

Medium-pressure gear & shaft:Carburized alloy steel,quenched,and precision-ground to wear-resistant hardness.Ultrahigh-pressure side plate:Thickened bimetallic composite, precision grinding reduces friction loss.Seals:Imported fluorine composite,rated -22℃ to +113℃,leak-free at 325bar.Bearings:High-precision roller bearings handle radial & axial loads at 2950r/min,15500-hour service life.

Built-in Internal Anti-Pollution Protection

An integrated mini filter protects high-pressure micro gears and variable mechanisms from hydraulic oil impurities – critical for long-term reliability in fluctuating workshop environments.

Model Code

The model code QX42-025/22-008R has a clear and intuitive coding logic, which is easy for purchasers to quickly identify product parameters and configuration without professional hydraulic knowledge, and is completely different from the interpretation of previous series:QX42=Medium-pressure main pump series(core series identifier,distinguishing from low-pressure miniature pump series);025=Rated displacement of 25 cm³/rev,suitable for medium-flow main drive hydraulic system needs;QX22=Ultrahigh-pressure micro pump configuration,adapting to high-precision clamping working environments up to 325bar;008=Micro displacement 8cm³/rev for precise pressure holding,ensuring high clamping precision and stability;R=Installation rotation specification(clockwise rotation),compatible with most mid-size industrial equipment;/=Integrated coaxial tandem configuration + split isolated oil chamber,ensuring no oil cross leakage under high pressure and adapting to complex working environments with impurities.As the core model of the QX series,QX42-025/22-008R is specially optimized for medium-pressure and ultrahigh-precision scenarios,with outstanding comprehensive performance,and is widely favored by global purchasers in automation,packaging and light industrial supporting fields.

Product Structure

1. Core Architecture: Graded Dual-Cavity Tandem Gear Structure

Fundamentally different from equal-spec twin gear(PVH),single gear(PV7),and split combined(AZPF)designsComposed of high-precision medium-pressure gear body,micro high-pressure gear,coaxial drive mechanism,and integrated unloading valve.

2. Variable Mechanism: Inner Unloading + Split Closed-Loop Control

Receives pressure signals in real time to switch medium-pressure unloading stateChanges medium pump idle stroke,enabling automatic unloading adjustment(0–25 cm³/rev)Closed-loop control automatically compensates displacement deviation for stable power output

3. Material Upgrades

Medium Gear & Shaft:High-strength carburized alloy steel,quenched,precision-ground – excellent wear resistance and pressure-bearing capacityHigh-pressure Side Plate:Thickened bimetallic + precision grinding – reduces friction loss,extends service lifeSeals:Imported fluorine composite,high-pressure resistant up to 325 bar,temperature range -22℃ to +113℃

4. Integrated Mini Filtration

Built-in small filter removes impurities from hydraulic oilPrevents blockage of micro high-pressure gear and unloading mechanism,improving overall reliability

Application Scenarios

Mid-size precision hydraulic tools – single-station forming presses, precision riveting equipment

Plastic auxiliary machinery – medium vertical injection molding clamping hydraulic units

Automation packaging – carton forming & cutting machine hydraulic systems

Light construction equipment – compact aerial work platforms,small sanitation lifting trucks

General hydraulic power units – factory automation fixture & mobile auxiliary applications

Light-duty special hydraulic systems & medium-temperature industrial scenarios for QX42-025/22-008R