Above 25 MPa Internal High-pressure Hydraulic Gear Pump - Efficient and Reliable Hydraulic Power Solutions
Fairy Deer Benefits Of Above 25 MPa Internal High-pressure Hydraulic Gear Pump
Rated pressure exceeding 25 MPa for demanding high-pressure operations;
Low noise operation for improved working environments;
Minimal pressure pulsation ensures smooth and reliable performance;
Excellent suction capability with broad fluid compatibility;
Multi-pump modular design for high flow and multi-circuit applications;
Suitable for constant-speed motor operation with long-term stable pressure output;
COMPARISON
Compact structure and durability comparison:
The internal meshing high-pressure pump adopts advanced axial and radial pressure compensation design, which can maintain high volumetric efficiency and stable output under high pressure (up to 30 MPa or more) and low speed and low viscosity conditions, significantly reducing flow and pressure pulsation, and ensuring system stability and mechanical precision.
Although the internal meshing medium-pressure pump has a compact structure, small size, light weight, smooth operation and low noise, it has large pressure pulsation and relatively low volumetric efficiency when working at high pressure. It is suitable for medium and low pressure systems, but not suitable for high-speed and high-pressure conditions.
Noise and flow pulsation performance:
Due to its multi-tooth meshing design and pressure compensation technology, the high-pressure internal meshing pump has much lower flow pulsation and noise than the medium-pressure pump. It is suitable for high-end manufacturing machinery with strict requirements on working environment noise and mechanical vibration, such as shearing machines, bending machines, presses, etc.
Although the noise of the medium-pressure pump is lower than that of the external meshing pump, the noise and pulsation are still relatively large under high pressure and low speed conditions, which is not conducive to the stable operation of high-precision equipment.
Applicable working conditions and system integration:
Internal meshing high-pressure pumps support multi-pump series connection, flexible combination of large and small displacements, meet the needs of complex high and low pressure working conditions, improve the overall efficiency of the system, save motor power and cost, and are suitable for high-pressure hydraulic systems and hydrostatic pressure systems.
Medium-pressure pumps are mostly used as replenishment pumps or auxiliary pumps, mainly suitable for closed systems and medium and low pressure hydraulic systems. They have relatively single functions and are difficult to meet the needs of high pressure and high efficiency.
Maintenance cost and manufacturing process:
Although the manufacturing cost of high-pressure internal meshing pumps is relatively high, they have low comprehensive maintenance costs due to their high reliability, low wear and long life, which can maximize customer benefits.
The price of medium-pressure pumps is relatively low, but due to pressure limitations and efficiency issues, long-term use may increase the frequency and cost of system maintenance.
Recommendation:
On the whole, the internal meshing (Internal) high-pressure Above 25 MPa hydraulic gear pump is superior to the internal meshing medium-pressure 16-25 MPa hydraulic gear pump in terms of pressure bearing capacity, flow stability, noise control and system adaptability. For customers who require high pressure, high efficiency, low noise, long life and adaptability to multiple working conditions, choosing an internal meshing high-pressure hydraulic gear pump can not only improve equipment performance, but also reduce overall operating costs and significantly enhance competitiveness.
Pressure Capacity and Application Scope：
Internal high-pressure gear pumps operate above 25 MPa, reaching up to 35 MPa, suitable for heavy-duty, high-pressure industrial equipment such as large metal forming machines, servo systems, and energy-efficient hydraulic setups. In contrast, low-pressure pumps below 16 MPa are designed for light-duty or auxiliary hydraulic systems and cannot meet the demands of high-pressure applications, limiting their performance and usage.
Volumetric Efficiency and Pressure Compensation：
High-pressure internal gear pumps feature advanced axial and radial pressure compensation, maintaining high volumetric efficiency and stable flow even at low speeds and low viscosity oils, reducing energy consumption and heat generation. Low-pressure pumps generally lack such compensation, resulting in lower efficiency and unstable flow.
Noise and Pressure Pulsation Control：
High-pressure pumps use high-strength cast iron and unique noise reduction designs to achieve very low noise and minimal flow and pressure pulsations, ensuring smooth operation, extended equipment life, and improved working conditions. Low-pressure pumps tend to have higher noise and pulsation, causing vibration and instability.
Durability and Maintenance Costs：
High-pressure pumps employ optimized internal gear structures and wear-resistant materials, showing strong resistance to oil contamination and mechanical wear, thus extending service life and lowering maintenance costs. Low-pressure pumps wear faster under heavy loads and complex conditions, increasing upkeep expenses.
System Flexibility and Multi-Pump Configuration：
High-pressure internal gear pumps support multi-pump combinations to meet complex multi-circuit hydraulic system demands for high flow and customization, enhancing design flexibility. Low-pressure pumps have limited combination capabilities, unsuitable for advanced industrial applications.
Structure and Working Principle：
Internal gear pumps consist of a driving internal gear and a driven external gear meshing inside the pump housing, with a crescent-shaped partition (“moon gear”) separating the suction and discharge chambers. External gear pumps have two external gears meshing outside the housing and require additional transmission components. Internal gear pumps feature a more compact, lightweight design, simplifying installation and maintenance.
Leakage and Pressure Stability：
Internal gear pumps exhibit significantly lower leakage due to their internal meshing and sealed chambers, providing stable discharge pressure with minimal pulsation even at pressures around 25 MPa. Leakage can be 20%-30% lower compared to external gear pumps, enhancing system efficiency and energy savings. External gear pumps, while capable of higher head, suffer from higher leakage affecting stability and lifespan.
Noise and Vibration：
Internal gear pumps operate with gears rotating in the same direction, resulting in smooth meshing, noise levels below 65 dB, and reduced vibration—ideal for noise-sensitive industrial environments. External gear pumps typically generate higher noise and pulsation, leading to mechanical vibrations and accelerated wear.
Suitable Fluids and Durability：
Internal gear pumps excel in handling high-viscosity fluids (1.0cSt to 300,000cSt), such as lubricating and transformer oils, with strong tolerance to contamination and extended service life. External gear pumps have broader fluid compatibility but generally lower efficiency and durability with viscous or contaminated fluids.
System Integration and Energy Efficiency：
The compact design and low pulsation of internal gear pumps facilitate multi-pump configurations for complex hydraulic systems, improving response times and energy efficiency. External gear pumps offer less flexibility and higher leakage and noise, reducing overall system performance.
Recommended Internal High-pressure Gear Pump
Single Gear Pump For KOMATSU PC75UU-2 Excavator
Triple Gear Pump For KOMATSU 3-5 Ton Excavator
Triple Gear Pump For KOMATSU 3-5 Ton Excavator
Internal High-Pressure Hydraulic Gear Pumps: Reliable Hydraulic Power for Industrial Excellence
Discover internal gear pumps engineered for industrial machinery, above 25 MPa high-pressure output with precision. Ideal for metal processing, injection molding, and servo systems, these pumps combine low noise, minimal pulsation, and extended durability to optimize productivity and operational reliability.
Construction Machinery - Crane
Provide high-pressure hydraulic power to drive the boom extension and lifting device to ensure stable load control.
Metal Processing Machinery - Shearing Machine and Bending Machine
Use high-pressure hydraulic systems to achieve precise cutting and forming of metal sheets, requiring the pump body to have low noise and high efficiency characteristics.
Metal Processing Machinery - Presses and Punching Machine
Used for mold stamping and metal forming, requiring high-pressure pumps to provide fast response and stable pressure output.
Rubber & Plastics Machinery - Injection Molding Machine
Servo energy-saving internal gear pumps can adapt to frequent switching between high and low speeds, achieve precise pressure control and energy-saving effects, and are suitable for precision injection molding.
Rubber & Plastics Machinery - Rubber Vulcanizing Machine
High-pressure pumps provide stable hot-pressing power to ensure the uniformity and efficiency of the vulcanization process.
Special Vehicles & Mobile Machinery - Fire Truck
Drive high-pressure water cannons and ladder hydraulic systems, requiring high-pressure resistant, low-leakage pump body design.
Special Vehicles & Mobile Machinery - Garbage Compactor
Hydraulic power for compression devices requires high pressure and long life.
Energy & Petrochemical - Lubrication System
Used for high-pressure lubricant delivery in oil refining equipment, requiring high temperature resistance and pollution resistance.
Rubber & Plastics Machinery - Injection Molding Machine
For delivering high-viscosity asphalt, the pump body must have wide viscosity adaptability and wear-resistant design.
Advanced Manufacturing & Automation - Servo Drive System
Used with servo motors to achieve precise flow control, used in hydraulic modules of semiconductor manufacturing equipment or precision machine tools.
Advanced Manufacturing & Automation - Fuel Boiler Feed System
Multi-pump combinations meet multiple circuit requirements, such as fixture control in automobile assembly lines.
Tips On How To Maintain And Extend Service Life Of Internal High-pressure Hydraulic Gear Pump
Maintaining internal high-pressure hydraulic gear pumps operating above 25 MPa is critical to ensure maximum lifespan, stable performance, and reduced downtime across various industrial applications. Below are detailed maintenance guidelines tailored for clients to optimize pump reliability and system efficiency:
1. Regular Inspections and Condition Monitoring
Perform scheduled inspections to detect early signs of wear, gear damage, or abnormal noise. Focus on checking:
Gear teeth wear: Excessive wear beyond 0.1 mm can reduce volumetric efficiency by up to 5%.
Shaft seal integrity: Prevent fluid leakage which can cause pressure drops and contamination.
Pump housing and bearings: Look for cracks or deformation that may lead to misalignment or vibration.
Use vibration analysis and thermal imaging tools for predictive maintenance to avoid unexpected failures.
2. Controlled Start-Up and Pressure Ramp-Up Procedures
After installation or maintenance, gradually increase system pressure to operating levels (above 25 MPa) over 10-15 minutes to allow internal components to stabilize. Sudden pressure spikes can cause gear tooth stress exceeding 150 MPa, risking premature fatigue. Controlled ramp-up minimizes mechanical shock and extends pump life by an estimated 20%.
3. Maintain Clean Hydraulic Fluid and Filtration Systems
Hydraulic fluid cleanliness directly impacts pump wear and efficiency:
Recommended ISO cleanliness level: 16/14/11 or better for high-pressure pumps.
Fluid viscosity: Maintain within manufacturer’s recommended range (typically 15-68 cSt at 40°C) to ensure proper lubrication and volumetric efficiency above 90%.
Replace filters regularly to prevent abrasive particle ingress, which can increase wear rate by up to 30%. Use high-quality synthetic fluids compatible with pump materials to reduce oxidation and sludge formation.
4. Monitor Operating Temperature and Pressure Stability
Keep pump operating temperature within 40-80°C to avoid thermal expansion and oil degradation. Temperatures above 90°C can reduce seal life by 50% and increase internal leakage. Ensure pressure pulsation remains below 5% of nominal pressure to reduce mechanical stress and noise, improving system reliability.
FAQs
① High-pressure capability: internal meshing design reduces leakage, with a pressure resistance of 25-35 MPa, while external meshing pumps are usually ≤20 MPa;
② Low pulsation and low noise: tooth shape optimization reduces flow pulsation (<3%), suitable for precision control scenarios;
③ High viscosity adaptability: can transport media with a viscosity range of 1-3000 cSt (such as asphalt, high-temperature lubricating oil);
④ Compact structure: the volume is 30% smaller than that of external meshing pumps at the same flow rate, saving installation space.
Need to choose according to the characteristics of the medium:
Corrosive fluid: stainless steel (such as SS304/316) or coating hardened steel for pump body/gear;
High wear scenario: silicon carbide ceramic side plate + nitrided steel gear;
High-temperature oil: fluororubber (FKM) seals with a temperature resistance of ≥120℃.
① Regularly monitor the axial clearance (recommended ≤0.05mm) to avoid efficiency loss;
② Use an online filtration system (filtration accuracy ≤10μm) to extend the life of the pump;
③ Choose a modular design pump that can quickly replace wear parts (such as side plates, bearings) without overall disassembly.
Yes, the servo motor + internal meshing pump combination can:
Reduce overflow losses through variable speed control and save energy by 30%-50%;
Achieve flow accuracy of ±1% and pressure fluctuation of <2%, which is suitable for high-demand scenarios such as injection molding machines and precision machine tools.
① Flow superposition: Dual pumps are connected in series to achieve higher flow (such as 2×50L/min→100L/min@25MPa);
② Functional zoning: The main pump drives large loads (such as crane booms), and the auxiliary pump controls auxiliary actions (such as steering);
③ Redundant backup: When one pump fails, the other pump can temporarily take over to improve system reliability.
Common causes and countermeasures:
Improper oil viscosity: Check the oil temperature (recommended 40-60℃) and ISO grade (such as VG46);
Overpressure operation: Install a pressure sensor and link the safety valve (set value ≤ 90% of the rated pressure);
Mechanical friction: Check the axial clearance and bearing wear, and replace the side plate or gear set if necessary.
Support customized solutions, such as:
Interface adaptation: SAE flange, BSPP/NPT thread, etc.;
Function expansion: integrated pressure compensation valve, temperature sensor interface;
Special certification: explosion-proof certification (ATEX/IECEx), marine certification (DNV/GL).
Enpower Your Machine Business Now!
Welcome to consult installation, maintenance and care, after-sales, price and other issues, we will reply you as soon as possible.
Support customization and distributor.