XPi XPi12 XPi18 XPi25 XPi41 XPi50 XPi63 XPi80 XPi108 XPi130 Series XPi41-0523763 Hydraulic Piston Oil Pump

1.Core technical parameters
As a representative quantitative plunger pump of the XPi series, its parameters are adapted to the requirements of medium and high pressure, high speed precision hydraulic systems. The core indicators are as follows:
• Pressure specification: Continuous working pressure of 380bar, peak pressure up to 420bar (short-term overload allowable value), suitable for high-pressure power output requirements of heavy equipment.
• Flow rate and displacement: The displacement is approximately 41mL/rev (the “41” in the model indicates the core displacement). At a rated speed of 3000r/min, the theoretical flow rate is about 123L/min, and the actual output flow rate fluctuates between 118 and 121L/min due to volumetric efficiency.
• Efficiency performance: Volumetric efficiency ≥95%, mechanical efficiency ≥94%, total efficiency ≥89%. Under high-speed and high-pressure conditions, energy loss is more than 15% lower than that of similar gear pumps.
• Speed and Torque: The maximum allowable speed is 3600r/min, and the torque absorbed at the rated pressure is approximately 150N · m (with mechanical efficiency calculated at 95%), suitable for the wide speed output characteristics of engines and motors.
• Medium and Environment: Compatible with ISO VG 32/46/68 anti-wear hydraulic oil, operating temperature range -25 ℃ to 85℃, anti-pollution grade up to ISO 4406 19/17/14, can adapt to harsh environments such as dust and vibration.
• Installation and Interface: Flange installation is adopted, compatible with SAE B type installation surface. The diameter of the oil inlet is φ32mm and the diameter of the oil outlet is φ25mm. It supports bidirectional rotation adaptation (which can be achieved by changing the position of the oil inlet).2. Working Principle
This pump adopts an inclined shaft type quantitative plunger structure. The volume change is achieved through the fixed inclination Angle between the cylinder body and the drive shaft. The core working process is as follows:
1. Power transmission and plunger reciprocation: The drive shaft rotates the connecting rod assembly through spline connection. Due to the fixed inclination Angle between the cylinder block and the drive shaft (the standard inclination Angle of 18° for the XPi series), the connecting rod pushes the plunger to perform reciprocating linear motion in the cylinder block hole.
2. Oil suction and discharge process: When the plunger rotates with the cylinder to the oil suction area, the plunger extends outward, increasing the volume inside the cylinder hole and creating a vacuum. The hydraulic oil is then sucked in through the oil inlet. When rotating to the oil discharge area, the plunger compresses inward, reducing its volume. The oil is then squeezed and discharged from the oil outlet, achieving the conversion of mechanical energy to hydraulic energy.
3. Quantitative output guarantee: Due to the fixed inclination Angle of the cylinder block and the constant reciprocating stroke of the plunger, the single oil suction and discharge volume is fixed. Therefore, when the rotational speed is stable, the output flow rate remains constant, and quantitative supply can be achieved without additional structural adjustment.
4. Bidirectional rotation adaptation: By changing the installation position of the oil inlet, it can adapt to the clockwise or counterclockwise rotation direction of the drive shaft, meeting the power input requirements of different equipment without modifying the pump body structure.

3. Product features and advantages
Core features
• Seven-plunger symmetrical layout: Seven plungers are evenly distributed along the circumference of the cylinder block, combined with the plate cylinder block synchronous technology. During rotation, the radial forces cancel each other out, and the operating noise is ≤75dB (under rated conditions), reducing vibration by 40% compared to the traditional 5-plunger structure.
• High-strength material integration: The cylinder body is made of forged alloy steel (tensile strength ≥800MPa), the plunger surface is coated with tungsten carbide, and the connecting rod is made of high-strength quenched and tempered steel. The overall impact load resistance capacity is three times higher than that of cast iron pump bodies.
• Enhanced sealing and protection: The shaft end is equipped with a deflector structure, which can prevent external dust and mud water from entering the sealing parts. Combined with a polytetrafluoroethylene combined seal, the sealing life can reach over 12,000 hours, which is 50% longer than that of ordinary oil seals.
• Modular integrated design: An optional built-in bypass valve can be equipped to connect the pump output with the oil inlet when the system is shut down, reducing the start-up load. At the same time, it supports an integrated pressure sensor interface for convenient system status monitoring.
Outstanding advantages
• Strong high-pressure stability: It can operate without failure for 2000 hours under a continuous working pressure of 380bar. The precise fit between the cylinder block and the plunger (clearance ≤0.005mm) keeps the high-pressure leakage within 0.5L/min.
• Flexible installation and adaptation: It supports bidirectional rotation and can adapt to the power input direction of different devices without adjusting the pump body. Moreover, it is compact in size (approximately 280×180×160mm in length × width × height), allowing it to be installed in the narrow space of the equipment.
• Durability and maintainability balance: Adopting a split structure, vulnerable parts such as the distribution plate and seals can be replaced separately, and there is no need to disassemble the entire hydraulic circuit. The single maintenance time can be controlled within 2 hours.
• Significant cost performance advantage: Compared with Bosch Rexroth pumps of the same displacement and fixed displacement, the price is 12%-15% lower, and the service life is comparable. It stands out in terms of cost performance in mid-range high-pressure hydraulic systems.

4. Usage functions and purposes
Core usage functions
• Quantitative high-pressure power output: As the power source of the hydraulic system, it outputs a certain amount of high-pressure oil at a constant rotational speed, providing stable power for hydraulic motors, cylinders and other actuating components, ensuring the consistency of equipment operations.
• Multi-condition adaptation and regulation: Through the wide-speed adaptation feature, stable output of flow and pressure can be maintained under different working conditions such as equipment start-up, idle speed, and full load, avoiding the chain problem of “speed fluctuation – unstable flow”.
• System startup protection: An optional bypass valve cuts off the high-voltage output when the equipment starts up, reducing the starting load on the motor or engine and extending the service life of the power source.
Main uses
It provides quantitative power for medium and high-pressure hydraulic systems, solving the pain points of large leakage and low efficiency of traditional quantitative pumps under high pressure. It is widely used in the hydraulic circuits of industrial machinery and special vehicles that require stable high-pressure output.

5. Applicable machines and scenarios
Applicable machines
• Special vehicles: The compression mechanism of garbage compsors, the lift arm drive of aerial work platforms, and the water pump power system of fire engines, all adapted to the high-speed output characteristics of vehicle engines.
• Industrial machinery: The clamping power unit of injection molding machines, the clamping system of die-casting machines, and the slider drive mechanism of heavy-duty presses, all meet the high-pressure and quantitative power requirements.
• Agricultural and construction machinery: Hydraulic suspension systems for large tractors, rotary motor drives for small excavators, and walking power circuits for crawler harvesters.
• Energy equipment: Yaw drive hydraulic systems for wind power equipment and high-pressure water pump power sources for photovoltaic panel cleaning equipment, suitable for operation in harsh outdoor environments.
Applicable scenarios
• High-pressure and heavy-load scenarios: The impact power supply for hydraulic rock drills used in mines. A continuous pressure of 380bar can drive the rock drill to achieve efficient rock breaking, with a 20% increase in operation efficiency compared to traditional pumps.
• Compact space installation scenario: The hydraulic system of small special-purpose vehicles (such as municipal repair vehicles), with its compact volume, can adapt to the limited layout space in the engine compartment.
• Wide temperature range operation scenarios: The hydraulic system of workover equipment in cold oil fields has a low-temperature start-up performance of -25℃ to ensure continuous operation in winter, and a high-temperature stability of 85℃ to adapt to desert environments.
• Bidirectional power demand scenario: The rotary mechanism of construction machinery, through the bidirectional rotation adaptation feature, can achieve forward and reverse drive without additional directional control valves.

6. Relevant models
Model of the same series and structure
• Core models of different displacements: XPi12-0517640 (12mL/rev, suitable for micro devices), XPi50-0517625 (50mL/rev, suitable for medium and large devices), XPi80-0517610 (80mL/rev, suitable for high flow requirements), XPi130-0517660 (130mL/rev) “Super large displacement compatible.”
• Derivative models with bypass valves: XPi41B-0523764 (integrated bypass valve, reducing start-up load by 30%), XPi41S-0523765 (with pressure sensor interface, supporting condition monitoring).
Alternative and compatible models
• Original factory direct replacement model: XPi40-0523762 (displacement 39mL/rev, compatible for replacement, flow deviation ≤5%).
• Competitive alternative model: SUNFAB SC047R (displacement 47mL/rev, same pressure specification, can be used as a substitute but at a 20% higher price).