Editorial Technical Reference

Hydraulic Power Unit

This page explains how Hydraulic Power Unit is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A self-contained system that generates hydraulic power for operating machinery components.

Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Hydraulic Power Unit

Definition
The hydraulic power unit is a critical component of a hydraulic press brake that provides the pressurized hydraulic fluid required to drive the ram and perform bending operations. It serves as the central power source for the entire hydraulic system of the press brake. This unit integrates an electric motor, hydraulic pump, reservoir, control valves, and filtration system into a compact assembly. The motor drives the pump, which draws fluid from the reservoir, pressurizes it, and delivers it through the control valves to the hydraulic cylinders. The system maintains pressure and flow to enable precise control of the press brake's bending force and speed. Typical specifications include a rated flow of 5–100 L/min, operating pressure of 1–35 MPa, motor power of 0.75–75 kW, and supply voltage of 220–690 V AC. The reservoir capacity ranges from 10 to 1000 L, and the filtration rating is 3–25 µm. The unit operates within a temperature range of -20 to 60 °C and has an ingress protection rating of IP54–IP65. Noise levels are typically 60–85 dB(A) at 1 m distance. Dimensions vary from 600×400×500 mm to 2000×1500×1800 mm, and weight ranges from 50 to 2000 kg. Materials commonly used include steel, cast iron, and aluminum. These values are reference ranges and must be verified for the specific model and application. Always confirm model-specific parameters and compliance with relevant standards such as ISO 4413, IEC 60038, ISO 4406, ISO 3744, and IEC 60529 with the legal manufacturer or supplier.
Working Principle
An electric motor drives a hydraulic pump that draws fluid from a reservoir, pressurizes it, and delivers it through control valves to the hydraulic cylinders. The system maintains pressure and flow to enable precise control of the press brake's bending force and speed. The pump creates flow, while the valves regulate direction and pressure. A relief valve protects the system from overpressure. The reservoir stores fluid and helps dissipate heat. Filters remove contaminants to maintain fluid cleanliness. The unit operates in a closed loop, with fluid returning to the reservoir after actuating the cylinders.
Common Materials
Steel, Cast Iron, Aluminum
Technical Parameters
ParameterTypical rangeNotes & selection driver
Rated Flow5–100 L/minFlow rate at rated pressure and speed.ISO 4413
Operating Pressure1–35 MPaMaximum continuous pressure.
Motor Power0.75–75 kWDrives the hydraulic pump.
Supply Voltage220–690 V ACThree-phase or single-phase.IEC 60038
Supply Frequency50–60 HzStandard grid frequency.IEC 60038
Reservoir Capacity10–1000 LHydraulic oil volume.
Filtration Rating3–25 µmAbsolute filter rating.ISO 4406
Noise Level60–85 dB(A)At 1 m distance.ISO 3744
Operating Temperature-20–60 °CAmbient and oil temperature.
Ingress ProtectionIP54–IP65Dust and water resistance.IEC 60529
Weight50–2000 kgDry weight without oil.
Dimensions (L×W×H)600×400×500–2000×1500×1800 mmOverall footprint.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Electric Motor
    Drives the hydraulic pump to generate fluid flow
  • Hydraulic Pump
    Converts mechanical energy into hydraulic energy by pressurizing fluid
  • Hydraulic Reservoir
    Stores hydraulic fluid and helps dissipate heat
  • Control Valves
    Regulate direction, pressure, and flow of hydraulic fluid
  • Filters
    Remove contaminants from hydraulic fluid to protect system components
  • Cooling System
    Maintains optimal hydraulic fluid temperature
  • Relief Valve
    Caps the system pressure and dumps flow back to tank on overload.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 300 bar (4350 psi)
flow rate: 5 to 200 L/min
temperature: -20°C to 80°C
slurry concentration: Not recommended for slurries above 5% solids by volume
Media Compatibility
✓ Hydraulic oil (ISO VG 32-68) ✓ Water-glycol fluids ✓ Synthetic ester-based fluids
Unsuitable: Highly corrosive chemical environments (e.g., chlorine, strong acids)
Sizing Data Required
  • Required flow rate (L/min)
  • Maximum operating pressure (bar)
  • Duty cycle (continuous/intermittent)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Cavitation
Cause: Inadequate fluid supply, excessive pump speed, or high fluid temperature causing vapor bubble formation and implosion on metal surfaces.
Internal leakage
Cause: Worn seals, scored cylinder walls, or damaged valve seats allowing fluid bypass, reducing pressure and efficiency.
Maintenance Indicators
  • Unusual knocking or whining noises from the pump indicating cavitation or bearing wear
  • Visible external fluid leaks or significant pressure drop during operation
Engineering Tips
  • Implement strict fluid cleanliness protocols with regular filtration and contamination monitoring
  • Maintain proper fluid temperature and viscosity through adequate cooling and scheduled fluid analysis/replacement

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 4413: Hydraulic fluid power - General rules and safety requirements for systems and their components ANSI/NFPA T2.6.1: Hydraulic fluid power - Systems and components - Pressure ratings DIN 24340: Hydraulic power units - Dimensions and requirements

Quoted from the published standard.

Manufacturing Precision
  • Cylinder bore diameter: +/-0.02mm
  • Mounting surface flatness: 0.1mm per 100mm
Quality Inspection
  • Pressure testing: Hydrostatic test to 1.5x maximum working pressure
  • Leakage testing: System leakage check at maximum operating pressure

Manufacturers of Hydraulic Power Unit

11 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

CM Energy
Xiamen, Fujian, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Dongying Lake Petroleum Technology CO., Ltd
Shandong, CN
ISO GOST
Listed on the company's own website · profile compiled by CNFX from public sources
Hebei Kingwell Machinery Co., Ltd.
Hebei, CN
API ISO GOST
Listed on the company's own website · profile compiled by CNFX from public sources
Hydraflu Hydraulic Co.
Shanghai, CN
CE
Listed on the company's own website · profile compiled by CNFX from public sources
Jiangsu Guorui Hydraulic Machinery Co., Ltd.
Jiangsu, CN
Founded 1986340 plus staff120,000㎡
Listed on the company's own website · profile compiled by CNFX from public sources
Jinan Huachen Industrial Co., Ltd.
Shandong, CN
Founded 199836,000 m²
ISO9001 CE
Listed on the company's own website · profile compiled by CNFX from public sources
Jining Furuide Machinery Manufacturing Co., Ltd. (FURD)
Jining, Shandong, CN
Founded 199020,000 m²
CE ISO9001 ISO14001
Also makes: Road Roller, Mini Excavator, Power Unit and 1 more
Listed on the company's own website · profile compiled by CNFX from public sources
Flutec Hydraulics
Wuxi, Jiangsu, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Hangzhou Chinabase Machinery Co., Ltd.
Hangzhou, Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Hydrath Power
Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Target Hydraulics
Shanghai, CN
Listed on the company's own website · profile compiled by CNFX from public sources
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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
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Frequently Asked Questions

What is the primary function of a hydraulic power unit in a press brake?

It generates and supplies pressurized hydraulic fluid to drive the ram and perform bending operations, acting as the central power source for the press brake's hydraulic system.

What are typical reference ranges for flow and pressure?

Rated flow is typically 5–100 L/min, and operating pressure is 1–35 MPa. These are reference ranges; actual values depend on the specific model and application.

Which standards are relevant for verification?

Relevant standards include ISO 4413 for hydraulic fluid power, IEC 60038 for voltage/frequency, ISO 4406 for filtration, ISO 3744 for noise, and IEC 60529 for ingress protection. Always verify compliance with the manufacturer.

What maintenance signals indicate potential issues?

Signals include abnormal noise, pressure drops, fluid leaks, overheating, or increased contamination. Regular checks of fluid level, filter condition, and pressure settings are recommended.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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