YZ Series Hydraulic Power Unit - YZW15-4: Working Principle And Applications

The YZW15-4 is a medium-duty hydraulic power unit from the YZ series, designed as a centralized power source for industrial hydraulic systems. It integrates a motor, hydraulic pump, oil tank, valve group, and cooling system into a modular structure, with a rated working pressure of 15 MPa and a flow rate of 4 L/min. Characterized by stable pressure output, compact design, and easy integration, it provides reliable hydraulic power for braking, clamping, lifting, and linear drive mechanisms in medium-load industrial equipment. Details are as follows:

1. Working Principle

The unit operates based on "electric drive → hydraulic pressure generation → pressure/flow regulation → power output," with a closed-loop control logic to ensure stable hydraulic supply. The core working process includes three stages:

1.1 Power Generation (Start-Up Stage)

When activated, the 380V three-phase asynchronous motor (power: 1.5 kW) drives the integrated gear pump (precision-machined steel gears) to rotate at high speed.

The gear pump draws ISO VG46 anti-wear hydraulic oil from the 40 L sealed oil tank through a 10 μm precision suction filter, converting mechanical energy into hydraulic pressure.

The oil is pressurized to the rated 15 MPa, and the pump delivers a stable flow rate of 4 L/min, forming high-pressure hydraulic oil ready for output.

1.2 Pressure & Flow Regulation (Stable Operation Stage)

A built-in relief valve (max pressure ≤18 MPa) limits the system pressure to prevent overpressure damage to hoses, cylinders, or actuators.

The integrated valve group (including directional control valve, pressure reducing valve, and check valve) adjusts the oil flow direction and pressure according to the host equipment's control signal.

For example, when the host requires thrust output, the directional valve switches to allow high-pressure oil to flow to the hydraulic actuator (cylinder/pusher); when the load is stable, the pressure reducing valve maintains constant pressure, avoiding energy waste.

1.3 Oil Circulation & Cooling (Continuous Operation Stage)

After driving the host actuator, the low-pressure hydraulic oil flows back to the oil tank through the return filter (5 μm precision), removing impurities to protect the pump and valve group.

A plate-type oil cooler (cooling area ≥0.3 m²) dissipates heat generated during oil circulation, controlling the oil temperature within 30–65°C to prevent oil degradation and seal failure.

The oil tank is equipped with an oil level sight glass and temperature sensor for real-time monitoring of oil quantity and temperature, facilitating maintenance.

1.4 Shutdown & Protection

When the host equipment completes its action, the motor is de-energized, and the gear pump stops working. The check valve prevents oil backflow, maintaining residual pressure in the pipeline for quick restart.

The motor is equipped with F-class insulation and a thermal protector, automatically cutting off power when the temperature exceeds 155°C to avoid overload burnout; the tank's overflow port prevents oil leakage due to excessive filling.

2. Key Features

Modular Integration: All components (motor, pump, valve group, tank, cooler) are integrated into one unit, reducing installation space by 40% compared to split systems and simplifying on-site assembly.

Stable Pressure Output: Pressure fluctuation ≤±1% of the rated value, ensuring consistent performance of the host hydraulic actuator (e.g., brake, clamp).

Efficient Filtration & Cooling: Dual-filter design (suction + return) and plate-type cooler extend oil service life to 2,000 working hours; prevent component wear caused by impurities.

Wide Adaptability: Operating temperature range -10°C to 70°C, IP54 protection rating, and anti-corrosion epoxy coating adapt to indoor workshops, outdoor construction sites, and dusty industrial environments.

Easy Maintenance: Removable side cover of the oil tank, external filter elements, and centralized valve group layout enable quick inspection and replacement without disassembling the entire unit.

3. Typical Applications

With a rated pressure of 15 MPa and flow rate of 4 L/min, the YZW15-4 is suitable for medium-load hydraulic systems (load capacity: 5–50 tons), providing power for various industrial mechanisms:

3.1 Industrial Braking Systems

Powers hydraulic brakes (e.g., YWZ series block brakes, YFX series wedge brakes) for overhead cranes, gantry cranes, and mine hoists. Stable pressure output ensures smooth braking and reliable locking, avoiding load shaking or equipment runaway.

Used in the braking system of medium-duty conveyors (e.g., belt conveyors, chain conveyors) in factories and mines, controlling brake engagement/release to prevent material backflow.

3.2 Material Handling & Clamping Equipment

Provides hydraulic power for clamping mechanisms of welding positioners, CNC machine tools, and workpiece fixtures. Precise pressure regulation ensures stable clamping force, avoiding workpiece deformation during processing.

Drives lifting mechanisms of small hydraulic elevators, scissor lifts, and warehouse stackers, enabling smooth lifting and positioning of goods or workpieces.

3.3 Construction & Engineering Machinery

Powers hydraulic systems of small construction equipment such as mini loaders, skid steer loaders, and small excavators. Adapts to construction site vibrations and dust, providing reliable power for bucket lifting, arm rotation, and braking.

Used in hydraulic jacks, hydraulic bolt tensioners, and other construction auxiliary tools, delivering stable pressure for installation and maintenance of large components.

3.4 General Industrial Hydraulic Systems

Drives electro-hydraulic pushers (e.g., ED series, YT1 series) and hydraulic cylinders for linear drive mechanisms in production lines, such as material pushing, sorting, and positioning devices.

Provides power for opening/closing control of industrial valves (e.g., gate valves, globe valves) in water treatment plants, power plants, and chemical workshops, ensuring precise valve regulation.

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