Gear oil pump QX Series QX21-012R

ℹ️ Product Description

Manufacturer: Hengmeisi. Gear oil pump QX Series QX21-012R – a perfect replacement for Bucher's QX series – is a high-performance single-direction internal gear pump with symmetric internal gear design and optimized tooth profile, delivering stable flow and minimal pressure pulsation. Built with robust cast housing and strict quality control for long service life in industrial and mobile hydraulics.

✨ Product Advantages

⚡ High Efficiency & Low Pulsation

Precision-engineered gear teeth ensure smooth meshing, achieving volumetric efficiency up to 98%. Extremely low flow and pressure pulsations reduce system vibration and noise, providing stable hydraulic power.

🛡️ Reliable Medium-Low Pressure Performance

Designed for continuous operation at 125 bar with peak pressure up to 150 bar, it delivers reliable performance for medium-low pressure systems. Hydrodynamic/hydrostatic lubrication extends service life under heavy-duty cycles.

🔄 Variable Speed Drive Compatible

Fully adaptable to variable-speed drives, enabling variable flow rates for energy-saving operation. Suitable for systems requiring adjustable output and efficient power utilization.

🌐 Wide Fluid & Application Adaptability

Compatible with mineral oils (HLP), fire-resistant fluids (HFB/HFC/HFD), biodegradable oils, and low-viscosity fluids. Certified for ATEX hazardous areas (II 3G Ex h IIC T3 Gc X), meeting diverse industrial requirements.

🔤 Model Code Explanation

• QX: Single-direction internal gear pump (non-motor)

• 21: Series size (QX2 series, small displacement)

• 012: Theoretical displacement 12.6 cm³/rev

 Rotation direction Clockwise (CW) (viewed from shaft end)

🧩 Product Structure

⚙️ Optimized Internal Gear Pair

CAE-optimized tooth profile ensures smooth operation, low noise, and high efficiency in single-direction rotation.

🏗️ Reinforced Cast Housing

One-piece cast iron body provides high structural strength, resisting pressure shocks and mechanical deformation.

🧴 Premium Sealing System

Multi-component sealing at shaft ends and joints prevents leakage, ensuring long-term reliable operation.

📏 Standard Mounting

ISO 3019/2 (metric) oval 2-hole flange and standard shaft dimensions ensure easy installation and interchangeability

🚀 Application Scenarios

🏭 Industrial Hydraulics

Low-pressure hydraulic power units

Lubrication and cooling systems

Machine tool auxiliary circuits

🚜 Mobile Machinery

Forklift auxiliary and steering pumps

Aerial work platforms

Small construction equipment

⛽ Fluid Transfer

Fuel and oil delivery

Low-viscosity fluid pumping

ATEX-compliant explosion-proof applications

📦 General Equipment

Conveyor drive systems

Light-duty hydraulic lifting platforms

Fan and rotary mechanism drives