Gear oil pump QXV Series QXV21-012R

Product Description

Hengmeisi Gear oil pump QXV Series QXV21-012R variable internal gear pump – perfect replacement for Bucher QXV series – upgrades fixed QX21 pumps with load-responsive control (290/350 bar), 12cc/rev right-hand rotation, and a compact casing for easy installation in tight spaces.

Product Advantages

Variable Pump vs Fixed Displacement Gear/Vane Design

Unlike fixed-volume internal gear pumps or small vane pumps with constant flow waste, QXV21-012R uses built-in variable regulating structure inside miniature pump housing. It cuts unnecessary overflow loss of fixed pumps, realizing on-demand flow supply and improving whole hydraulic system energy efficiency greatly.

Built-in Closed-loop Variable Flow Regulation

The integrated closed-loop variable mechanism receives hydraulic feedback signals to adjust effective displacement steplessly based on load variation from 0 up to rated 12cm³/rev. Displacement deviation gets automatically compensated, ensuring stable micro flow output far superior to manually adjusted miniature pumps.

Premium Materials for Mini Long-term Durability

Gear & drive shaft: carburized alloy steel, precision ground for high hardness and low wear;Seals: customized nitrile rubber matched for QXV21 series, rated -25℃~+85℃, leak-free under rated working pressure;Bearings: tiny precision needle bearings support stable continuous rotation up to 1500rpm for long service cycles.

Built-in Mini Anti-Contamination Protection

A compact integrated impurity filtering structure guards miniature gear core and variable adjustment parts from fine dirt inside hydraulic oil, effectively avoiding small pump jamming and abnormal flow drop during long-time intermittent operation.

Model Code

The model code QXV21-012R follows standard BUCHER coding logic, easy for buyers to confirm parameters without professional hydraulic expertise:QXV: Variable-type internal gear pump series (variable upgraded version, different from fixed QX standard series);21: Core QX21 mini-size pump platform, specialized for small-displacement micro hydraulic layout;012: Benchmark fixed maximum displacement of 12 cm³/rev for micro-flow precision oil supply;R: Right-hand drive shaft specification, universal rotation matching most miniature automation equipment.As core mini variable model of QXV series, QXV21-012R is optimized for low-power precision variable hydraulic systems, widely sourced by global buyers for small automation and laboratory hydraulic devices.

Product Structure

Core Architecture: Mini Variable Internal Meshing Gear Structure

Different from conventional fixed QX21 pump structure, QXV21-012R combines inner-outer gear set + built-in miniature variable regulator inside one compact cast pump housing.

Closed-loop Load Sensing Variable Mechanism

It captures real-time pressure feedback from hydraulic circuit to change effective meshing volume, enabling stepless flow adjustment within 0~12cc/rev; closed-loop calibration offsets flow drift to guarantee steady output.

Micro Grade Component Material Upgrade

Gear assembly: quenched fine-ground alloy steel for anti-wear; customized miniature sealing set adapts wide ambient temperature; high-rigidity compact cast iron casing resists micro vibration in frequent start-stop work.

Pre-installed Standard Mini Oil Port Layout

Factory pre-assembled standardized small inlet/outlet ports, consistent with original QX21 mounting dimension for direct replacement and convenient on-site pipeline wiring.

Application Scenarios

Precision automation fixtures: micro variable hydraulic power for small clamping production equipment;

Laboratory hydraulic benches: adjustable micro-flow power source for precision testing instruments;

Mini compact hydraulic stations: energy-saving variable power pack for embedded small hydraulic modules;

Light precision processing machinery: hydraulic drive for tiny plastic pressing & precision assembling devices;

Low-temperature small industrial equipment: stable variable hydraulic component for outdoor compact machinery.