Guangdong Yanhui Hydraulic Co., Ltd. is one of the leading manufacturers and suppliers of Bucher Gear Pumps in China. We warmly welcome you to wholesale bulk Bucher Gear Pumps for sale here from our factory. If you have any enquiry about pricelist and quotation, please feel free to email us.
Product Overview
▔▔Bucher Gear Pumps (primarily highlighting the renowned QX, QXV, AP, and GAP high-performance internal and external gear pump series) are premium hydraulic displacement units engineered for high-pressure fluid delivery and ultra-precise pressure/flow control. Positioned as top-tier industrial components, Bucher gear pumps feature an advanced pinion-and-internal-gear design that yields exceptionally low pulsation, whisper-quiet operation, and near-zero flow ripple. They are specifically developed for high-precision hydraulic control scenarios where strict system dynamic response, high volumetric efficiency, and extreme acoustic control are mandatory.
Key Advantages
▔▔- High Power Density and Dynamic Response: Compact 71-frame design delivers continuous torque up to 20 Nm (100 K thermal rating) and peak torque up to 52.5 Nm, enabling fast acceleration and dynamic deceleration profiles.
- High-Precision Optical Feedback: Integrated multiturn absolute encoder with Hiperface interface (128 signal periods) provides absolute position data without requiring battery-backed revolution memory reset upon power cycles.
- Integrated Electrically Released Holding Brake: Built-in 23 Nm holding brake ensures static axis retention during power-off or emergency stop conditions, preventing accidental vertical or load movement.
- Maintenance-Free Natural Convection Cooling: Passive surface cooling design eliminates fan vibration, external noise, auxiliary cooling power lines, and routine filter maintenance.
- Versatile Electrical Connection: Features a 240-degree rotatable encoder connector for flexible cable routing in space-constrained cabinet and machine enclosures.
- Industrial Durability: Rated to IP65 protection standard and class 155 (F) thermal insulation for high resistance to dust, moisture, and elevated ambient operating temperatures.
-
Technical Specifications
▔▔
| Technical Parameter | QX Series (Internal Gear) | QXV Series (High Viscosity) | AP Series (External Gear) |
| Displacement Range (cm³/rev) | 5.0 to 500.0 | 10.0 to 250.0 | 1.2 to 24.0 |
| Max. Continuous Pressure (bar) | Up to 315 | Up to 250 | Up to 250 |
| Max. Peak Pressure (bar) | Up to 400 | Up to 300 | Up to 280 |
| Rated Speed Range (rpm) | 400 – 3000 | 200 – 2000 | 600 – 3500 |
| Fluid Temperature Range (°C) | -20 to +80 | -10 to +100 | -15 to +80 |
| Viscosity Range (mm²/s / cSt) | 10 to 300 | 10 to 1000 | 10 to 300 |
| Hysteresis / Flow Ripple (%) | Below 1.5% | Below 2.0% | Below 3.0% |
| Response Time (Speed Adjust) | Under 15 ms | Under 25 ms | Under 20 ms |
| Required Filtration Level | ISO 4406 18/16/13 | ISO 4406 19/17/14 | ISO 4406 19/17/14 |
Configuration Options
▔▔
Bucher gear pumps provide modular configurations to integrate seamlessly into diverse hydraulic systems:
- Construction Type: Single pumps, double/multiple pumps, and combination pump units sharing a common drive shaft.
- Control Interface: Fixed displacement output; dynamic control via variable-speed electric/servo motors or proportional valves.
- Feedback & Monitoring: Optional integrated speed pickup sensors, pressure transducer ports, and temp monitoring ports.
- Rated Displacement / Flow Options: Broad selection from micro-flow units (1.2 cm³/rev) up to heavy industrial volumes (500 cm³/rev).
- Mounting Interfaces: Standard SAE 2-bolt / 4-bolt flanges, ISO 3019-2 European flanges, and rectangular 4-bolt patterns.
- Shaft Configurations: Cylindrical keyed shafts, splined shafts (SAE / DIN standard), and tapered shaft options.
- Porting & Connection: SAE flange ports, metric threads, BSPP threaded connections, and rear/side port locations.
- Sealing & Seals: NBR standard seals, FKM (Viton) high-temperature/chemical seals, and specialized EPDM seals.
Key Materials and Components
▔▔
- Housing & End Covers: High-strength ductile cast iron (nodular iron) for QX internal gear series to prevent housing expansion under high pressure; high-grade extruded aluminum alloy for lightweight AP external gear series.
- Gears & Pinions: Case-hardened alloy steel with precision ground gear tooth profiles to ensure minimal friction loss, ultra-quiet tooth meshing, and high wear resistance.
- Radial/Axial Compensation Blocks: Specialized bronze alloy and modified high-strength polymer composites providing continuous gap compensation under shifting thermal and pressure loads.
- Dynamic Shaft Seals: Double-lip FKM (Viton) seals reinforced with stainless steel springs to withstand internal casing pressures and abrasive contamination.
Packaging and Transport Protection
▔▔
- Internal Preservation: Internal chambers are pre-filled with dynamic anti-corrosion test oil and sealed with high-grade plastic port plugs.
- Vapor & Moisture Protection: Hermetically heat-sealed in heavy-duty VCI (Vapor Corrosion Inhibitor) plastic bags with enclosed silica gel desiccant packs.
- Shock Absorption & Cushioning: Enclosed within custom molded high-density EPE foam cradles inside individual corrugated cartons to prevent impact damage.
- Bulk Packaging: Multi-unit orders are secured in ISPM-15 compliant heat-treated wooden crates, banded with steel straps, and wrapped in industrial stretch film.
Applications
▔▔- Injection Molding Machines: Used in main hydraulic power units and servo-pump drives for low-noise, energy-efficient clamping, injection control, and holding pressure stability.
- Metal Stamping & Hydraulic Presses: Applied in main pressure feed circuits to deliver constant high pressure with minimal pulsation during metal forming cycles.
- Elevators & Lift Systems: Serves as the primary fluid supply pump in hydraulic passenger lifts, ensuring smooth, silent acceleration and accurate leveling control.
- Mobile Construction Equipment: Utilized in steering control circuits, pilot pressure generation, and auxiliary hydraulic functions in excavators, loaders, and compactors.
- Wind Turbine Hydraulics: Integrated into pitch control and rotor brake systems, offering precise fluid positioning under harsh outdoor conditions.
Related Models
▔▔| Series Family | Model Code / Part Number | Nominal Displacement | Max. Pressure | Shaft / Flange Type |
| QX Series | QX21-010R | 10.0 cm³/rev | 250 bar | ISO Flange / Cylindrical Shaft |
| QX Series | QX31-020R | 20.0 cm³/rev | 315 bar | SAE-B Flange / Splined Shaft |
| QX Series | QX41-032R | 32.0 cm³/rev | 315 bar | ISO Flange / Keyed Shaft |
| QX Series | QX51-063R | 63.0 cm³/rev | 250 bar | SAE-C Flange / Splined Shaft |
| QX Series | QX61-125R | 125.0 cm³/rev | 250 bar | ISO Flange / Keyed Shaft |
| QXV Series | QXV32-025R | 25.0 cm³/rev | 210 bar | ISO Flange / Keyed Shaft |
| AP Series | AP100/1.2 R | 1.2 cm³/rev | 250 bar | European 4-Bolt / Tapered Shaft |
| AP Series | AP200/10 R | 10.0 cm³/rev | 230 bar | SAE-A Flange / Splined Shaft |
FAQ
▔▔
Q1: How do I confirm the correct model code when replacing an existing Bucher gear pump?
A: Check the metal nameplate attached to the pump body for the full model designation (e.g., QX31-020R), rotation direction (R for Right/Clockwise, L for Left/Counter-clockwise), and serial number. Providing a clear photo of the nameplate to our technical team ensures exact model cross-referencing.
Q2: What fluid cleanliness level is required to maintain pump lifespan?
A: Fluid cleanliness should meet ISO 4406 Class 18/16/13 or better (NAS 1638 Class 7 to 8). We recommend installing a suction strainer or a high-pressure inline filter with a rating of 10 to 25 microns.
Q3: Which hydraulic oils are compatible with Bucher gear pumps?
A: Standard units are compatible with mineral oil-based hydraulic fluids (HL and HLP to DIN 51524). For synthetic fluids, fire-resistant fluids (HFC/HFD), or bio-degradable oils, please specify during inquiry so we can equip the unit with appropriate FKM or custom seals.
Contact Us
▔▔Get in touch with us and we will get in touch with you quickly to give you more personalized information.
Product Overview
▔▔The Bucher QX Series represents the 5th generation of high-performance internal gear pumps developed by Bucher Hydraulics. Built upon decades of engineering refinement, the QX series is world-renowned for its exceptionally low noise emissions, minimum flow and pressure pulsations, long service life, and robust pressure capability up to 400 bar.
Key Advantages
▔▔-
Ultra-Low Noise Levels: Emits under 75 dB(A) even under high operating pressure, creating quiet working environments.
Minimal Pressure & Flow Pulsations: Special pinion-shaft gear geometry ensures continuous, vibration-free fluid delivery.
High Working Pressure: Capable of continuous operating pressures up to 315 bar and peak/intermittent pressures up to 400 bar.
Energy Efficient & High Volumetric Efficiency: Delivers overall efficiency up to 98% thanks to optimized sealing surfaces and hydrodynamic lubrication.
Variable-Speed & Reversing Capability: Fully optimized for modern servo-driven drives and rapid bi-directional/reversing operation.
Fluid Versatility: Compatible with mineral hydraulic oils, fire-resistant fluids (HFC, HFD), and biodegradable media.
-
Technical Specifications
▔▔| Technical Parameter | Specification / Range | Notes / Reference |
| Displacement Range | 5.0 to 500.0 cm³/rev | Frame sizes QX2 to QX8 |
| Maximum Operating Pressure | Up to 315 bar (Continuous) / 400 bar (Peak/Intermittent) | Depends on frame size and speed |
| Operating Speed Range | 300 to 4,600 rpm (Standard QX/QXEH) / Up to 6,050 rpm (QXEHX series) | Dependent on inlet pressure and fluid viscosity |
| Noise Level | < 65 to 75 dB(A) | Measured at 1,450 rpm and max pressure |
| Volumetric Efficiency | Up to 98% | At nominal working conditions |
| Mounting Flange | SAE 2-hole oval flange / ISO 3019-1 or 3019-2 | Metric & SAE options available |
| Shaft Types | Parallel keyed shaft / Splined shaft (SAE) | Heavy-duty steel construction |
| Direction of Rotation | Clockwise (CW), Counter-clockwise (CCW), or Bi-directional | Reversible execution available |
| Fluid Viscosity Range | 10 to 100 mm²/s (Operating) / Up to 300 mm²/s (Cold Start) | Standard HLP hydraulic oil |
| Fluid Temperature Range | -20°C to +80°C | NBR seals (FKM options up to +120°C) |
| Fluid Cleanliness Class | ISO 4406 Code 20/18/15 | NAS 1638 Class 9 equivalent |
| Usable Fluids | Mineral oil (HLP), HFC (water-glycol), HFD (synthetic esters), Bio-oils | Specific seal & material prep for non-mineral fluids |
Applications
▔▔| Application Sector | Specific Equipment / Machinery | Key Benefits Provided by QX Pumps |
| Plastics & Rubber Processing | Injection molding machines, blow molding equipment, extruders. | Ultra-low noise, high pressure holding efficiency, dynamic speed response with servo motors. |
| Metal Forming & Die Casting | Hydraulic forming presses, die casting machines, stamping presses, shears. | High peak pressure capacity (up to 400 bar), rapid pressure build-up, resistance to cyclic fatigue. |
| Machine Tools & Automation | CNC machining centers, broaching machines, hydraulic clamping systems. | Non-pulsating fluid delivery ensures smooth tool feed and high surface finishing quality. |
| Waste & Material Handling | Waste compactors, scrap balers, hydraulic crushers. | Compact footprint, continuous heavy-duty pressure rating, high tolerance to varying viscosity. |
| Renewable Energy & Marine | Wind turbine pitch control, marine auxiliary power, deck winches, lift drives. | Reliable performance in hazardous/corrosive environments, ATEX certified options. |
| Motion Simulation & Drives | Flight simulators, elevator/lift drives, variable speed fan drives. | Extremely quiet operation (<75 dB), smooth transition during reversing or multi-quadrant operation. |
Related Models
▔▔| Model Series | Pressure Class | Key Feature / Designation | Typical Usage Scenario |
| QX Standard (QX2–QX8) | Up to 400 bar | Standard single/multi-stage internal gear pumps with wide displacement range. | General industrial power units, presses, stationary hydraulics. |
| QXEH Series | Up to 280 bar | High-efficiency series designed for variable-speed servo motor drives. | Plastic injection molding, metal forming. |
| QXEHX Series | Up to 280 bar | High-speed evolution of QXEH (speeds up to 20% higher, up to 6,050 rpm). | Highly dynamic servo-pump systems, downsized electric motor drives. |
| QXEM Series | Up to 250 bar | Symmetric 2-quadrant/4-quadrant pump/motor unit for reversing operation. | Servo drives with energy recovery and rapid forward/reverse movement. |
| QXM Series | Up to 400 bar | Heavy-duty bi-directional pump/motor unit for open/closed loops. | Flight simulators, winches, lift/elevator drives, fan drives. |
| QX Combination Pumps | Up to 400 bar | Tandem or triple pumps combined on a single drive shaft (e.g., QX51-080/41-032). | Multi-circuit hydraulic systems with central motor drive. |
FAQ
▔▔
Q1: Why is the Bucher QX series significantly quieter than conventional hydraulic pumps?
A: The QX series achieves ultra-low noise levels (often under 75 dB(A)) through its specialized internal gear geometry and non-compensated pinion-shaft design. The unmeshing and meshing of the gear teeth occur along a long crescent expansion zone with low gradient velocity, eliminating fluid trapped between tooth roots and avoiding hydraulic shock waves.
Q2: Can Bucher QX series pumps be driven by variable-speed servo motors?
A: Yes. The QX, QXEH, and QXEHX series are specially optimized for servo-pump applications. Their non-compensated structural design allows stable operation at near-zero shaft speeds under high holding pressures, as well as rapid acceleration up to high speeds (up to 6,050 rpm in QXEHX models) without cavitation or wear.
Contact Us
▔▔Request a Quote Today to ensure your hydraulic system performs at its best with genuine components from Yanhui Hydraulic.
Hot Tags: Bucher Gear Pumps, China Bucher Gear Pumps suppliers, Bucher Pump, Bucher QT Internal Gear Pumps, Bucher QX Internal Gear Pumps, Bucher QX32 Pump, Bucher QXT Internal Gear Pump, Bucher QXV Internal Gear Pumps
