Product Short Description
Product Brief Introduction
Miniature single-stage direct drive electro-hydraulic servo valve optimized for low-flow compact hydraulic actuation systems; integrated permanent magnet torque motor directly actuates control spool without secondary pilot amplification stage, designed for precision micro-motion closed-loop force and position control with limited space envelope installation constraints.
Description
Technical Specifications
- Rated Nominal Flow @ 70 bar Delta Pressure: 2.2 L/min
- Standard Control Input Signal: ±20 mA differential analog drive current
- Torque Motor Coil DC Resistance: 120 Ω per winding pair
- Hysteresis Maximum Value: ≤ 0.4% full scale input
- Spool Resolution Threshold: ≤ 0.08% full scale command signal
- Dynamic Bandwidth (-3dB): 450 Hz ultra-high frequency response
- Continuous Maximum Supply Hydraulic Pressure: 210 bar
- Return Line Permitted Back Pressure Range: 0 bar to 7 bar
- Compatible Hydraulic Fluid Viscosity: 5 cSt to 80 cSt
- Fluid Operating Temperature Window: -15 °C to +80 °C
- Mounting Port Standard: Custom compact four-port miniature manifold mounting footprint
Functional Features
- Single-stage direct spool actuation eliminating pilot stage flow lag for ultra-fast transient response
- Permanent magnet high-efficiency torque motor with low continuous power consumption
- Integrated spool position mechanical feedback spring for linear proportional flow output
- Miniature compact body form factor for small-bore hydraulic actuator integration
- Stainless steel precision lapped spool-sleeve assembly with low internal fluid leakage
Material Composition
- Valve Main Body: Precision machined 7075-T6 aerospace aluminum alloy
- Spool and Sleeve Assembly: Precipitation hardening stainless steel with polished lapped sealing surfaces
- Torque Motor Permanent Magnet: Samarium-cobalt high temperature rare earth magnet
- Motor Coil Insulation: Polyimide high heat resistant enamel copper winding
- Feedback Return Spring: Non-magnetic high tensile Inconel alloy spring wire
- Fluid Seals: Low-temperature compatible FKM fluoropolymer elastomer sealing rings
Structural Characteristics
- Ultra-compact monolithic machined valve body minimizing overall installation footprint
- Integrated top-side permanent magnet torque motor sealed to isolate electrical components from hydraulic fluid
- Direct mechanical coupling between torque motor armature and main control spool
- Four compact threaded hydraulic ports machined into valve base body for manifold connection
- External threaded mounting holes integrated into valve body perimeter for direct manifold bolting
Working Principle
±20 mA differential analog control current energizes dual torque motor coils generating variable magnetic torque acting on the permanent magnet armature assembly. Armature directly displaces the single-stage main control spool against integrated return feedback spring, directing proportional hydraulic flow to actuator control ports A and B. Spring force counterbalances magnetic torque to stabilize spool travel at position directly proportional to input electrical command current, delivering linear volumetric hydraulic flow output matching analog signal magnitude without intermediate pilot amplification stages.
Advantage Highlights
- Industry-leading 450 Hz bandwidth enables ultra-high speed micro precision motion control
- Miniature compact body permits integration inside limited-volume hydraulic actuator assemblies
- Single-stage construction eliminates pilot nozzle clogging failure modes in low-flow clean fluid systems
- Minimal internal fluid leakage reduces steady-state hydraulic power consumption
- Low hysteresis and sub-0.1% resolution delivers sub-micron positioning repeatability
Applicable Industries
Medical precision hydraulic test equipment, semiconductor wafer handling micro-actuators, small component material tensile test rigs, aerospace miniature actuator control systems, optical alignment precision motion stages, laboratory micro fatigue testing machines
Installation Requirements
- Mount valve on dedicated custom miniature aluminum hydraulic manifold block using specified M4 mounting bolts
- Torque M4 mounting fasteners to 4.5 N·m with even cross-tightening sequence
- Install 2 μm absolute micro-filter on valve supply hydraulic port to block fine particulate contamination
- Use shielded twisted pair wire for ±20 mA control signal wiring with single-point cable shield grounding
- Maintain nominal hydraulic fluid operating temperature between 35 °C and 65 °C for optimal linearity
Usage Precautions
- Do not expose valve supply pressure above continuous 210 bar rating; structural body deformation risk occurs
- Exclusively use clean hydraulic fluid meeting ISO 4406 16/13 cleanliness classification
- Avoid physical shock loading to torque motor top housing; permanent magnet demagnetization risk
- Only operate with ±20 mA differential analog drive current; voltage signal inputs damage motor windings
- Complete minimum 15-minute full system flush after circuit assembly before engaging closed-loop servo control
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