SV1-10/32/100/6 EMG Rotary Direct Drive Servo Valve 32L 100bar

Product Overview:

The SV1-10/32/100/6 and SV1-10/48/315/6 are EMG single-stage rotary direct-drive servo valves (4/3 proportional). Featuring a patented electromagnetic rotary drive with return springs, the rotating spool design eliminates axial friction and hydraulic compression forces. Dynamic performance is virtually independent of pressure and current. Fully compliant with ISO 4401 NG10 (CETOP 5) mounting pattern, these valves offer true drop-in interchangeability with equivalent OEM servo valves. Every unit undergoes 100% simulated operating-condition testing to guarantee high volumetric efficiency, zero external leakage and long-term reliability in demanding closed-loop hydraulic systems.

Technical Specifications 

• Models: SV1-10/32/100/6, SV1-10/48/315/6 (Art. No. reference 226702 series)
• Nominal size: NG10 (DIN 24340 / ISO 4401 / CETOP 5)
• Function: 4/3 proportional servo valve, single-stage
• Drive: Electromagnetic rotary drive with return springs (patented)
• Nominal flow QN (ΔpN = 20 bar): 32 L/min (/32), 48 L/min (/48)
• Nominal flow QN (ΔpN = 70 bar): 46 L/min (/32), 70 L/min (/48)
• Operating pressure range pS: 5…100 bar (/100), 30…315 bar (/315)
• Max. permissible return pressure pT: 30 bar
• Overlap: 6%
• External leakage: 0
• Typical internal leakage (pS = 100 bar, I = 0 mA, 50 °C): approx. 0.7–2.8 L/min depending on version
• Rated current (terminals 1-2): ±300 mA (/32), ±1000 mA (/48)
• Resistance: approx. 44 Ω (/32), 11 Ω (/48)
• Operating temperature: -10…+70 °C
• Storage temperature: -20…+80 °C
• Weight: 6.5 kg or 7.5 kg (version dependent)
• Dimensions (H×W×L): 127 × 72 × 264 (325) mm
• Protection class: IP65 (with plug tightened)
• Recommended filtration: ISO 4406 17/15/12

Key Technical Advantages

1. Patented rotary drive: Rotating spool eliminates sliding friction and flow forces of conventional spool valves, delivering exceptional sensitivity, near-zero temperature and pressure drift of the null point.
2. Zero external leakage & high volumetric efficiency: Precision-matched clearances plus centering springs ensure zero external leakage and minimal internal leakage for energy-efficient operation.
3. Full interchangeability & long service life: Exact ISO 4401 NG10 interface allows direct replacement of equivalent servo valves; low-wear rotary design extends operational lifetime.
4. Wide pressure/flow coverage: Suitable for both low-pressure (5–100 bar) and high-pressure (30–315 bar) systems; 6% overlap provides smooth proportional control and fast dynamic response.
5. 100% factory testing & easy maintenance: Every valve is tested under simulated conditions; supports in-line cleaning, external null adjustment and performance monitoring.

Application Areas

• Steel strip guiding, tension and leveling systems (HR series etc.)
• Injection molding and die-casting machines (high-speed shot & holding control)
• Construction machinery precision actuators (steering, lifting proportional control)
• Test stands, load simulation and force/position closed-loop systems
• Machine tools and presses requiring high-accuracy hydraulic servo loops

Expert Maintenance Tips

1. Thoroughly clean the mounting surface and fluid lines before installation; maintain filtration to ISO 4406 17/15/12 to protect the rotary clearances.
2. Verify correct polarity and current rating (±300 mA preferred for /32 versions) and apply recommended dither (50/150 Hz) to minimize hysteresis.
3. Monitor internal leakage and null drift periodically; return springs center the valve automatically on power loss—no additional dump valves required.
4. Use mineral oil HLP/HVLP VG46 (DIN 51524); other media (HFC/HFD) require prior confirmation. Keep return-line pressure ≤ 30 bar.
5. After long storage, perform low-current cycling to confirm free rotary movement before applying full system load.