Gear oil pump QX Series QX31-020/23-006R

Product Description

Gear oil pump QX Series QX31-020/23-006R is factory-direct supplied high-low tandem gear pump from Hengmeisi China supplier, hybrid two different series specifications: QX31(20ml/r large flow low pressure)+QX23(6ml/r small displacement high pressure). Dual loop works cooperatively: low-pressure large flow realizes rapid cylinder advance/retract to save idle energy consumption; high-pressure small flow bears load pressurization. Rated high-pressure 250bar, low-pressure 80bar, flow pulsation ≤2.3%, ideal replacement for single pump with energy-saving unloading loop.

Product Advantages

1.High&Low Pressure Compound Structure vs Equal-displacement Common Dual Pump

Different from two same-spec tandem gear pumps, QX31-020/23-006R adopts disparate displacement mixed layout: big flow low pressure + tiny flow high pressure coaxial integration. Realize fast no-load stroke + low-flow high-pressure clamping automatically, effectively cut motor power and reduce idle energy waste.

2.Automatic Unloading Energy-saving Design

Low-pressure large-flow circuit unloads automatically when system builds high pressure, surplus oil directly inside pump bypass without external unloading valve, simplify hydraulic circuit layout and reduce extra valve purchase cost.

3.Graded Wear-resistant Matching for Different Working Pressure

QX31 low-pressure group: refined alloy gear + standard composite side plate for large flow continuous circulation;QX23 high-pressure group: carburized ultra-fine grinding gear + thickened bimetallic side plate, fluorine seal assembly;Whole pump seal suits -22~108℃ environment, high-pressure cavity keeps zero leakage under 310bar peak pressure;Compact bearing configuration, stable operation below 3200r/min, service life ≥15000 hours.

4.Small Body Easy Installation for Compact Equipment Cabin

Integrated compact cast housing, overall dimension smaller than split assembled two pumps, fit narrow installation space of small-sized automation equipment and mini special vehicles.

Model Code 

Detailed coding definition of QX31-020/23-006R:

QX31：Low-pressure large flow series, 020 = 20ml/r low-pressure displacement;

QX23：High-pressure small flow series, 006 = 6ml/r high-pressure displacement;

/：Integrated coaxial connection of two different pump series;

R：Clockwise rotation; Left rotation L can be customized per client drawing.QX31-020/23-006R is classic energy-saving compound pump of QX series, exclusive for fast-forward high-clamping hydraulic requirement.

Product Structure

1.Dual-series Hybrid Coaxial Integrated Shell

One-piece pump shell installs QX31 low-pressure module and QX23 high-pressure module in series, single input shaft drives two different size gear sets synchronously.

2.Independent Partition Double Oil Chamber

Internal isolation spacer completely separates high/low pressure inner cavity, oil medium of two loops does not mix, each oil outlet independent oil supply.

3.Distinct Component Configuration by Pressure Grade

High-pressure side uses enhanced wear-resistant accessories, low-pressure side adopts cost-effective standard parts, reasonable graded configuration balances performance and cost.

4.Built-in Internal Unloading Channel

Precast internal unloading oil passage inside pump body, realize automatic unloading of low-pressure loop without extra pipeline modification.

Application Scenarios

Main applicable equipment for QX31-020/23-006R high-low double pump

1.Small Hydraulic Machinery: Small desktop hydraulic press, riveting machine, punching equipment2.Plastic Auxiliary Equipment: Small vertical injection molding machine clamping system3.Automation Equipment: Automatic fixture, cutting and forming machinery4.Light Agricultural Machinery: Mini fruit tree pruning vehicle, small hydraulic transplant machine5.Light Special Vehicle: Small lifting platform, compact sanitation equipment hydraulic unit