PVD PVD-00B/0B/1B/2B/3B/15B Excavator Original High Pressure Hydraulic Piston Pump PVD-15B-32BP-9AG5-5116B

I. Technical Parameters

Displacement and pressure performance•
Displacement specification: Swashplate variable piston pump, theoretical displacement 15 mL/r (mL/ RPM), supports manual variable adjustment, displacement adjustment range 0-15 ml /r, suitable for medium and small flow medium and high pressure hydraulic systems.
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Pressure rating: Continuous working pressure 25 MPa (250 bar), instantaneous peak pressure 31.5 MPa (315 bar), single duration ≤10 seconds, capable of withstanding impact loads under heavy working conditions.
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Flow output: At the rated speed of 1500 rpm, the maximum flow rate is 13.05 L/min (15 mL/r×1500 rpm× volumetric efficiency 92%). At 2000 rpm, the flow rate is 17.4 L/min. When the variable is adjusted, the flow rate varies linearly with the displacement.
2. Rotational speed and structural parameters

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Speed range: Minimum speed 600 rpm, maximum speed 2500 rpm, compatible with 4-pole asynchronous motor (1450 rpm) and diesel engine power source, low-speed operation stability error ≤±2%.
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Structural type: Axial swash plate variable piston pump, featuring a “7-piston uniform distribution + manual variable mechanism” design. The piston diameter is 12mm, the stroke is 10mm, the maximum inclination Angle of the swash plate is 18°, and the distribution plate is made of bimetallic composite material.
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Core material: The pump body is made of high-strength aluminum alloy (6061-T6, tensile strength ≥310 MPa), the plunger is made of stainless steel (304, surface roughness Ra0.2), the swash plate is quenched with 40Cr (surface hardness HRC55-58), and the sealing part is a combination seal of polytetrafluoroethylene and nitrile rubber.
3. Installation and oil port specifications

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Installation method: Flange installation (4-hole positioning), in compliance with SAE B standard, positioning pin diameter Φ 10mm, installation center distance 140× 100mm, suitable for small and medium-sized hydraulic power units, supports horizontal installation.
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Oil port dimensions: Suction port G1.5 (internal thread), pressure port G1 (internal thread), discharge port G1/4 (internal thread), compatible with DN25-DN32 hydraulic pipelines. The suction port can be customized with flange connection to enhance the oil flow capacity.
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Weight and dimensions: The overall weight of the machine is 28 kg, with length × width × height =260×180×150 mm. The compact structure makes it easy to integrate into equipment with limited space.
4. Oil and environmental requirements

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Oil type: L-HM 46 anti-wear hydraulic oil is recommended. L-HV 46 hydraulic oil should be selected for low-temperature environments (below -20℃). It is compatible with phosphate ester flame-retardant hydraulic fluid. The kinematic viscosity range of the oil is 18-300 mm²/s.
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Cleanliness standard: ISO 4406 16/13 grade (NAS 7 grade). A 100 μm oil filter (filtration flow rate ≥ twice the pump flow rate) should be installed at the oil suction port. A 10-20 μm fine filter should be added at the oil return port. It is recommended to add a pressure pipeline filter in the high-pressure circuit.
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Working environment: Ambient temperature -25℃ to 80℃, relative humidity ≤95% (no condensation), can adapt to vibration and oil contamination conditions, protection grade IP54, avoid long-term exposure to environments with excessively high dust concentration.

Ii. Working Principle

This pump is an axial swash plate type variable piston pump. It achieves high-pressure hydraulic energy output through the core mechanism of “swash plate driving the piston to reciprocate – periodic change of cylinder cavity volume – distribution plate changing of inlet oil”. The variable mechanism can adjust the displacement to meet the load requirements. The specific process is as follows:
Power transmission and plunger drive

The power source drives the pump shaft to rotate through a coupling. The pump shaft drives the cylinder to rotate synchronously. Under the action of centrifugal force and the return disc spring, the ball heads of the seven evenly distributed plungers in the cylinder are always in close contact with the end face of the swash plate. The swash plate and the cylinder block have a fixed inclination Angle (up to 18°). When the cylinder block rotates, the inclined surface of the swash plate forces the plunger to perform reciprocating linear motion in the cylinder block holes.
2. Suction oil circulation and variable regulation

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Oil suction stage: When the plunger rotates with the cylinder block to the “lower inclined plane” area of the swash plate, it extends outward under the action of the return disk spring. The volume of the sealed cavity in the cylinder block hole gradually increases, forming a local vacuum. The oil in the oil tank enters the cavity through the oil suction pipeline and the oil suction window of the distribution plate, completing the oil suction process.
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During the oil pressure stage: When the plunger rotates to the “upper inclined plane” area of the swash plate, the inclined plane of the swash plate squeezes the plunger back into the cylinder, causing the volume of the sealed cavity to sharply decrease. The oil is pressurized to the rated pressure and then discharged to the system through the oil pressure window of the distribution plate and the oil pressure pipeline, completing the oil pressure process.
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Variable adjustment: The inclination Angle of the swash plate is changed by manually adjusting the variable mechanism. When the inclination Angle increases, the reciprocating stroke of the plunger increases and the displacement increases. When the tilt Angle decreases (until it reaches 0°), the stroke shortens and the displacement decreases (until it reaches 0), achieving stepless flow regulation to match the load requirements.
3. Sealing and flow distribution guarantee

The distribution plate and the end face of the cylinder block adopt a precise fit design (axial clearance 0.01- 0.03mm), combined with high-pressure oil film sealing, effectively isolating the oil suction chamber from the oil pressure chamber, reducing internal leakage. The plunger and the cylinder block hole adopt clearance sealing (fit clearance 0.005- 0.01mm), ensuring high-pressure sealing performance while reducing wear. The variable mechanism changes the displacement by adjusting the Angle of the swash plate. The distribution plate adaptively changes the incoming oil according to the displacement variation, ensuring the continuous and stable circulation of the suction oil.

Iii. Product Features and Advantages

High pressure, high precision and high volumetric efficiency

It adopts a 7-plunger uniform distribution + precise distribution plate design, with a continuous working pressure of up to 25 MPa, far exceeding the pressure rating of gear pumps and vane pumps. The precise fit between the plunger and the cylinder block hole enables a volumetric efficiency as high as 90%-95% (under rated conditions), saving 20%-25% energy compared to gear pumps of the same displacement. The flow pulsation rate is ≤3%, making it suitable for precision control scenarios with high requirements for pressure stability (such as hydraulic forming).
2. The variables are flexible and have strong load adaptability

The manual variable mechanism supports stepless adjustment of displacement from 0 to 15 mL/r, and can adjust the output flow in real time according to load changes, avoiding energy waste caused by “a big horse pulling a small cart”. The swash plate’s tilt Angle adjustment range is wide (0-18°), and the flow regulation response time is ≤0.5 seconds, making it suitable for scenarios with frequent load fluctuations (such as the luffing action of construction machinery).
3. High reliability and long service life

The plunger is made of stainless steel with a polished surface and is matched with a 40Cr quenched swash plate, featuring a low wear coefficient. The return disc spring is made of fatigue-resistant alloy material, with a cycle life of over 10 million times. The fault-free operating life under rated conditions reaches 12,000 hours, which is 50% longer than that of ordinary vane pumps.
4. Wide medium compatibility and environmental adaptability

The polytetrafluoroethylene + nitrile rubber combination seal is compatible with various media such as anti-wear hydraulic oil and flame-retardant hydraulic fluid, and is suitable for special fire prevention scenarios such as metallurgy and coal mines. The starting torque increases by no more than 30% in a low-temperature environment of -25℃, with no jamming phenomenon, and it can operate stably in cold regions.

Iv. Usage Functions and Purposes

1. Core usage functions

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High-pressure power output: It provides a stable pressure oil of 25 MPa for medium and high-pressure actuating components (such as high-pressure hydraulic cylinders and hydraulic motors), driving heavy-duty actions (such as extrusion and lifting). A single pump can meet the requirements of actuating components with a power of ≤55 kW.
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Stepless variable fuel supply: By adjusting the Angle of the swash plate, the flow rate can be steplessly changed from 0 to 13.05 L/min (1500 rpm), which is suitable for multi-speed operation scenarios such as “fast advance – working advance – fast retreat”, and improves operation efficiency.
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Precision pressure control: When used in conjunction with a relief valve, it can achieve a pressure regulation accuracy of ±0.5 MPa, making it suitable for processes with high requirements for pressure control accuracy, such as hydraulic forming and precision pressing.
2. Main application fields

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Construction machinery: Bucket excavation drive for small excavators under 5 tons, steering system for loaders, high-pressure hydraulic source for lifting mechanisms of forklifts.
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Industrial manufacturing equipment: Injection mechanisms for small and medium-sized injection molding machines, pressing systems for presses under 100 tons, and precision hydraulic chuck clamping devices.
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Metallurgical and mining equipment: Small rolling mill lowering devices, auxiliary action drives for mine roadheaders, hydraulic valve control for mineral processing equipment.
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Special equipment: Hydraulic wrench power source, small aerospace parts forming equipment, ship hydraulic steering gear drive.

V. Applicable Machines and Scenarios

1. Adapt to the core machine

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Construction machinery: Small excavators under 5 tons, small loaders, and electric forklifts.
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Industrial equipment: Small and medium-sized injection molding machines, 100-ton presses, CNC machining centers (hydraulic chucks).
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Heavy industrial equipment: small rolling mills, mine tunnel boring machines, flotation machines for mineral processing.
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Specialized equipment: Hydraulic wrenches, precision forming machines, small steering gears for ships.
2. Typical application scenarios

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Excavator excavation operation: At a speed of 1500 rpm, it outputs a flow rate of 13.05 L/min, driving the bucket hydraulic cylinder to achieve 25 MPa pressure excavation, with an excavation force of up to 80 kN, suitable for medium and small-sized earthwork projects.
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Precision pressing process: At 1200 rpm, the flow rate is adjusted to 8 L/min through a variable mechanism, providing a stable pressure of 25 MPa for a 100-ton press. The pressing accuracy is ≤± 0.02mm, making it suitable for the precision forming of automotive parts.
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Low-temperature outdoor operation: For open-pit mines at -20℃, L-HV 46 hydraulic oil is selected. After the pump body starts, the oil temperature rises above 5℃ within 3 minutes, driving the auxiliary action of the roadheader. Continuous operation without pressure fluctuation.

Six. Similar models

1. Alternative models of the same series

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PVD-10B-32BP-9AG5-5116B: Theoretical displacement 10 mL/r, continuous pressure 25 MPa, flow rate 8.7 L/min at 1500 rpm, suitable for low-flow high-pressure scenarios (such as hydraulic wrenches), installation dimensions compatible with the original model.
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PVD-20B-32BP-9AG5-5116B: Theoretical displacement 20 mL/r, continuous pressure 25 MPa, flow rate 17.4 L/min at 1500 rpm, suitable for high-flow and high-pressure systems (such as 20-ton loaders), with consistent structural forms.
2. Cross-series alternative models

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PV2R-15: Vane plunger pump (composite structure), displacement 15 mL/r, continuous pressure 16 MPa, simple structure and low cost, suitable for low-pressure and high-pressure mixed scenarios (such as ordinary machine tools).
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A4VSO-18: A high-pressure axial piston pump with a displacement of 18 mL/r and a continuous pressure of 31.5 MPa, featuring an electrically controlled variable mechanism, is suitable for high-precision closed-loop control scenarios (such as aerospace testing equipment).

Vii. Precautions for Use

1. Oil and fluid management norms

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It is mandatory to use L-HM 46 or L-HV 46 anti-wear hydraulic oil. Different grades and types of oil must not be mixed. The first oil change cycle is 500 hours, and subsequent oil changes should be made every 1,000 hours. Before changing the oil, the pipeline should be flushed with new oil (the flushing oil volume should be ≥ twice the system volume) to ensure that the cleanliness meets the standards.
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When the pressure difference of the suction oil filter exceeds 0.2 bar, it should be replaced immediately. The return oil filter should be inspected every 500 hours and replaced when it is severely contaminated. Check the moisture content of the oil every month. When it exceeds 0.05%, dehydration treatment is required to prevent the plunger from rusting.
2. Installation and commissioning requirements

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The connection is made by elastic couplings. The coaxiality error between the pump shaft and the motor shaft is no more than 0.1mm, and the angular error is no more than 0.2°. It is strictly prohibited for the pump bearings to be subjected to radial force (such as directly installing pulleys) to avoid uneven wear of the cylinder body.
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The diameter of the oil suction pipeline should be no less than Φ 32mm, the length no more than 1.5m, the number of elbows no more than 1, the oil suction height no more than 0.5m, and the pipeline interface must be absolutely sealed to prevent cavitation caused by air intake. The installation direction must comply with the arrow marks on the pump body. Reverse rotation is strictly prohibited.
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Before the first start, manually turn the wheel 5 to 6 times to fill the pump body with hydraulic oil. After startup, run it no-load for 10 minutes (when the oil temperature rises above 20℃), then gradually load it. The pressure increase rate should be no more than 1 MPa/ minute to avoid high-pressure shock.
3. Operation monitoring and maintenance

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During operation, monitor the pressure (≤25 MPa), oil temperature (optimal 20-60℃, maximum ≤80℃), and noise (normal ≤78 dB(A)). If a sudden drop in pressure, abnormal increase in oil temperature or abnormal noise is detected, stop the machine immediately and check for wear of the plunger or leakage of the distribution plate.
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Disassemble and inspect every 2000 hours: Replace the plunger when the surface wear exceeds 0.02mm or scratches appear. When the depth of the scratch on the sealing surface of the distribution plate exceeds 0.01mm, it needs to be ground and repaired. If it cannot be repaired, it should be replaced.
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The variable mechanism should be lubricated with grease (lithium-based grease NLGI grade 2) every 1000 hours to ensure smooth regulation. When performing maintenance, it should be carried out in a clean environment to prevent impurities from entering the interior of the cylinder block.
4. Storage and protection Specifications

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When stored for a long time, seal the suction and pressure oil ports, inject anti-rust oil (the oil volume should be 90% of the pump body volume), and place it in a dry and well-ventilated area (humidity ≤60%, temperature 5-35℃). Manually rotate the pump once a month to prevent the plunger from getting stuck.
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Before putting it into use after being idle for more than six months, drain the anti-rust oil, rinse it three times with new oil, run it no-load for 15 minutes, gradually increase the load to the rated pressure, and put it into use only after confirming there is no leakage or abnormal noise.