Gear oil pump QX Series QX31-020//24-003R06-ME

Hengmeisi, a leading China pump supplier, presents the Gear oil pump QX Series QX31-020//24-003R06-ME dual internal gear pump. It combines two unequal displacements for stable medium-high pressure, low ripple, and synchronized operation. With ME custom build and R06 seals, it handles various fluids across a wide temperature range. A drop-in replacement for Bucher units—ideal for complex hydraulic circuits and multi-purpose industrial machinery.

2. Product Description

As a reputable Chinese factory and direct supplier of full-series hydraulic pumps, Hengmeisi independently develops and manufactures the high-performance QX31-020//24-003R06-ME combined internal gear oil pump. This model adopts two different series pump units integrated into one compact body, combining medium flow and micro flow output to satisfy compound hydraulic working demands. The main unit is QX31 series with 20cm³/rev displacement, while the auxiliary unit is QX24 series with 3cm³/rev displacement. The whole pump runs in clockwise rotation, matches R06 standard oil port and enhanced sealing, plus exclusive ME customized mounting structure. It keeps high working efficiency and steady pressure output during long cyclic operation, easy to install and maintain for diverse industrial hydraulic systems.

QX82-200R09	QX43-032/21-012R	QX82-160/62-080/62-080R	QX21-016/21-012R	QX63-080/51-100R
QX42-025/32-012L	QXT22-006/22-006	QXV21-012/23-006R44	QX42-032/31-025R	QX81-500/81-500R83
QX81-400/51-080R83	QX61-200/51-080R83	QXV52-050R179	QXV42-032R246	QX21-010//24-003R06-ME
QX42-032/22-008R120	QX22-008/22-005/22-005R	QX52-040R06	QX63-125L09	QX52-040/23-005/23-005R08
QX41-040/23-005/23-005R08	QX82-200/43-020R	QXV82-250R179	QX64-100R21	QX63-125R12-1

3. Product Advantages

3.1 Dual Different-Spec Combined Structure vs. Ordinary Combined Pumps

Most traditional combined pumps adopt two identical pump units, which cannot match mixed flow demands of complex hydraulic loops. The QX31-020//24-003R06-ME combined internal gear oil pump uses differentiated dual-pump design. The medium-flow main pump undertakes main power output, and the micro-flow auxiliary pump is responsible for pressure compensation, pressure holding and auxiliary control. Two pump units operate synchronously without mutual interference. This targeted combination optimizes hydraulic loop design, saves installation space and improves the overall working coordination of equipment.

3.2 Optimized Material & Process for Long-Durability Operation

Integrated Pump Body: High-rigidity cast iron via one-piece CNC machining, strong pressure resistance and anti-deformation capacity, adapting to continuous cyclic work.

Gear Components: Two sets of gear pairs adopt professional quenching treatment, surface hardness up to HRC59, excellent wear resistance and low meshing loss.

Shaft & Bearing Group: Reinforced drive shaft matched with high-precision silent bearings, stable rotation within full speed range, low vibration and long service life.

Sealing & Configuration: R06 standard composite seals fit -30℃ ~ +120℃ environment; ME customized mounting structure ensures firm installation and good shock resistance.

3.3 Independent Flow Channel & Excellent Anti-Pollution Performance

Each pump unit of QX31-020//24-003R06-ME is equipped with independent flow channel and pressure balance mechanism. The optimized flow guide structure reduces fluid turbulence and intercepts tiny impurities in hydraulic oil, effectively protecting internal precision parts. Even working in medium-poor oil quality conditions, the dual pump groups can still maintain stable flow and pressure. The overall anti-fouling ability greatly reduces daily maintenance frequency and lowers equipment operating costs.

4. Model Code Explanation

The model QX31-020//24-003R06-ME follows standard industrial coding rules, each symbol clearly defines series, displacement, rotation, port and special configuration:

QX: Universal internal gear oil pump series, high efficiency, low pulsation and stable performance

31: Main pump series code, medium-high pressure conventional series for main hydraulic power supply

020: Main pump displacement, 20 cm³/rev medium flow specification

24: Auxiliary pump series code, miniature high-precision series for pressure compensation and auxiliary control

003: Auxiliary pump displacement, 3 cm³/rev micro flow specification

R: Rotation direction, clockwise rotation for the whole combined pump

06: Standard industrial oil port layout and universal enhanced sealing version

ME: Special customized mounting structure code, exclusive installation size for matched industrial equipment

5. Product Structure

Core Architecture: Differentiated Dual-Pump Integrated StructureThe QX31-020//24-003R06-ME combined internal gear oil pump is composed of QX31 main pump gear pair, QX24 auxiliary pump gear pair, integral cast iron pump housing, two sets of independent pressure balance plates and shared drive assembly. Two pump units share one drive system to realize synchronous operation, and each unit is an independent working module to complete respective hydraulic tasks. The integrated structure is compact and highly adaptable to narrow installation space.

**Processing & Material FeaturesAll core parts are finished by high-precision machining to ensure assembly clearance and operation accuracy. The pump body adopts thickened structure to bear composite hydraulic load from dual pumps. Two groups of gear pairs use optimized conjugate tooth profile, which reduces meshing friction and heat generation, and further promotes the overall working efficiency of the combined pump.

**Special Configuration DesignR06 standard sealing system realizes full-range anti-leakage under rated pressure. The ME customized mounting base is structurally reinforced, which can effectively buffer mechanical vibration during equipment operation and prevent displacement or loosening. Independent pressure balance structure keeps each pump unit running at optimal state all the time.

6. Application Scenarios

Precision Injection Molding Machinery: Small and medium injection molding equipment requiring fast action and precise pressure holding

Hydraulic Servo Systems: Servo hydraulic stations with pressure compensation and auxiliary control loops

Automation & Fixture Equipment: Multi-action automated production lines and combined hydraulic fixture systems

Light Industrial Machinery: Packaging machines, printing equipment and supporting hydraulic power units

General Industrial Hydraulic Equipment: Small hydraulic presses, testing machines and multi-loop hydraulic power packs