A servo hydraulic cylinder is an integrated closed-loop executive unit that combines a servo valve (or proportional servo valve), a high-precision feedback sensor (e.g., an LVDT displacement sensor), and a low-friction cylinder assembly. Its core lies in the precise conversion and real-time correction of electrical signals → hydraulic energy → mechanical energy.

Command Input: The controller issues electrical signals for position/speed/force.
Electro-Hydraulic Conversion: The servo valve receives deviation signals, adjusts the valve port opening and direction, and controls the flow and pressure of hydraulic oil entering the two chambers of the cylinder.
Execution Output: High-pressure oil drives the piston/piston rod to output thrust and displacement, realizing load movement.
Closed-Loop Correction: The sensor collects real-time status data and feeds it back to the controller, which dynamically adjusts the command through PID calculation until the error approaches zero.

🟡 Key Technical Highlights:
Low-Friction Design: Adopts gap-free guide rings and low-friction seals, with starting resistance ≤ 5N, avoiding static dead zones and limit cycle vibrations.
High Rigidity & Strength: Redundant design of cylinder wall thickness and optimized slenderness ratio of piston rod, adapting to high-frequency impact and heavy-load column stability requirements.
High Cleanliness Control: Full-process clean assembly, compatible with NAS 6-7 grade hydraulic oil, reducing the risk of servo valve jamming.

🟡 Position Measuring System

This contactless and absolute position measuring system is pressure-tight up to 500 bar. Its function principle is based on the magnetostrictive effect. In connection with this, a torsion impulse is triggered off when two magnetic fields meet. This impulse is directed from the point of measurement via the waveguide inside the measuring side to the sensor head. The transit time is constant and virtually independent of temperature. It is proportional to the position of the solenoid and can therefore be used as a reference for the actual position value and is converted into a direct analog-to-digital output in the sensor head.

🟡 Technical Data

Operating Pressure: 250 bar

Analog Output: 0 to 10V

Load Resistance: ≥5kΩ

Resolution: Infinite

Analog Output: 4 to 20 mA

Load Resistance: ≥100kΩ

Resolution: Infinite

Digital Output: SSI 24-bit Gray-coded

Resolution: 5 μm

Linearity (Absolute Accuracy): ≤±0.05% (referred to measuring length) min. ±0.05 mm

Reproducibility: ≤±0.001% (referred to measuring length) min. ±0.006 mm

Hysteresis: ≤ 0.03 mm

Supply Voltage: 24VDC (±25% with analog output)

Power Requirement: 80 mA

Residual Ripple Content: ≤1% ss 24VDC (+20%/-15% with digital output)

Power Requirement: 55 mA

Residual Ripple Content: ≤1% ss

🟡 Type of Insulation

Tube and Flange: IP67

Sensor Electronics: IP65

🟡 Operation Temperature:

Sensor Electronics: -40℃ to +65℃

Measuring Side: -40℃ to +85℃

🟡 Temperature Coefficient

Voltage: 700 ppm/℃

Current: 90 ppm/℃

🟡 Application Scenarios
Industrial Manufacturing

CNC machine tool worktable positioning, large press slide precision control, automotive chassis dynamometer loading, plastic injection molding machine precision clamping, and metal forming equipment stroke control.

Testing & R&D

Material fatigue test benches, seismic simulation shakers, aerospace engine component load testing, automotive durability test systems, and structural performance testing of heavy machinery parts.

Special Equipment

Heavy-duty robot joint drive, offshore engineering platform attitude adjustment, military equipment precision actuation, radar antenna positioning systems, and wind turbine pitch control.

Metallurgical & Heavy Industry

Rolling mill roll gap adjustment, continuous casting machine mold oscillation control, and heavy forging press synchronization control.

Aerospace & Defense

Aircraft landing gear retraction test systems, missile launcher attitude adjustment, and satellite component vibration testing platforms.

🟡 Customization Service

For special operating conditions or non-standard requirements, we offer comprehensive customization. Parameters such as material, diameter, stroke length, hardness, and surface treatment can be tailored to your exact needs. Please provide detailed technical drawings or requirement specifications, and our professional team will promptly coordinate the solution.

🟡 Cooperation Guarantee:

Factory-direct supply ensures quality control; we offer full pre-sales technical consultation (including working condition analysis and parameter verification) and comprehensive after-sales support (prompt issue resolution and return and exchange assurance). Bulk order discounts are available. Distributors and enterprise customers worldwide are welcome to contact us for inquiries and negotiations.