Gear oil pump QX Series QX51-125/42-025R

Product Description

Hengmeisi Gear oil pump QX Series QX51-125/42-025R dual internal gear pump – direct factory replacement for Bucher combined pumps – integrates two cores in one housing. Rated 310 bar continuous / 370 bar peak, it delivers separate fixed flows for main and auxiliary circuits. Optimized tooth profile reduces pulsation for composite hydraulic systems.

Product Advantages

Mixed Large-medium Displacement vs Equal-size Twin Gear Pump Designs

Unlike twin pumps with identical displacement or single independent gear pump, QX51-125/42-025R adopts 125cc & 25cc graded flow matching. Large-flow core supplies main driving power while medium-flow core takes charge of pressure compensation and auxiliary action, avoiding energy waste from redundant flow of same-spec dual pumps and cutting total installation space.

Isolated Dual-circuit Independent Hydraulic Layout

Built with completely separated internal flow channels inside pump casing, QX51-125/42-025R realizes non-interference oil supply of two circuits. Main and auxiliary hydraulic loops run separately without pressure cross-interference, simplifying peripheral hydraulic valve layout and lowering system failure probability.

Premium Materials for Continuous Heavy-duty Durability

Gear & drive shaft: carburized alloy steel after precision grinding for outstanding wear resistance;

Seals: standard industrial composite rubber, working steadily from -20℃~90℃ to prevent high-pressure leakage;

Bearings: heavy-load roller bearings support max 1700rpm long-term continuous running under alternating load.

Optimized Internal Meshing Anti-contamination Structure

Upgraded internal gear meshing structure of QX51-125/42-025R owns stronger impurity tolerance than traditional external gear pumps. It reduces gear jamming risk caused by tiny dirt in hydraulic oil and guarantees stable long-period operation under harsh on-site working fluid conditions.

Model Code

The model code QX51-125/42-025R follows standard BUCHER coding logic, helping purchasers check parameters without professional hydraulic knowledge；

QX51: Large-displacement QX51 series pump platform, for high-flow main hydraulic power;

125: Fixed displacement of 125cm³/rev for primary main circuit oil supply;

QX42: Medium-spec QX42 series pump core for auxiliary control loop;

025: 25cm³/rev fixed displacement dedicated to pressure stabilizing and flow compensation;

R: Right-hand drive shaft, universal rotation matching most industrial host equipment.

As classic graded combined pump of QX series, QX51-125/42-025R is optimized for heavy composite hydraulic systems and widely purchased by global clients in metallurgy and machinery industries.

Product Structure

1.Core Architecture: Integrated Dual-core Internal Meshing Gear Structure

Different from split-assembled two separate pumps, QX51-125/42-025R assembles two independent inner-outer gear groups inside one integral cast iron pump body with partitioned flow passage.

2.Graded Fixed-flow Independent Output Mechanism

Two pump cores work at fixed respective displacement: 125cc core outputs large flow for rapid equipment action while 25cc core provides steady small flow for pressure holding, simplifying multi-loop hydraulic design.

3.Upgraded Component Raw Material

Gear sets: quenched high-hardness alloy steel for anti-abrasion; high-rigidity cast pump housing resists vibration during long high-pressure operation; customized sealing components eliminate cross-circuit oil leakage.

4.Standard Pre-installed Oil Port & Mounting Flange

Factory preset standardized inlet/outlet ports and mounting dimension consistent with original BUCHER specification, supporting direct replacement and quick field pipeline assembly.

Application Scenarios

Metallurgical equipment: main & auxiliary dual-circuit hydraulic station for rolling mill and casting line;

Heavy forming machinery: dual-flow hydraulic power for large injection molding and die-casting machines;

Construction machinery: auxiliary integrated hydraulic power for heavy-duty hydraulic excavators;

Marine hydraulic system: deck machinery compound power unit for ship auxiliary equipment;

Custom industrial hydraulic units: integrated dual-flow power pack for non-standard heavy-load hydraulic equipment.