EMG SV1 SV2 Servo Valve | SV1-10 SV1-16 SV2-20

Genlu Hydraulic proudly introduces our precision-engineered replacements for the EMG SV1 and SV2 Series rotary slide electro-hydraulic servo valves. These top-tier closed-loop control components are profoundly engineered to thrive in highly contaminated, dusty, and relentless industrial environments—most notably metallurgical rolling mills. This comprehensive range covers primary configurations such as SV1-06, SV1-10, SV1-16, and SV2-10, SV2-20, including specific engineering specifications like the SV1-10 16 315 6 (denoting: SV1 series, size 10, nominal flow 16 L/min, maximum pressure 315 bar, design series 6).

Functioning as the critical actuator for strip guiding and precision pressing systems, Genlu guarantees 100% Drop-in Interchangeability with original German EMG servo valves across mounting patterns, electrical interfaces, flow gain, and dynamic response profiles. Backed by our uncompromising 100% Simulation Load Testing, each servo valve undergoes severe high-pressure threshold and frequency response validations, guaranteeing uninterrupted, jam-resistant hydraulic control in the most brutal steel plant conditions.

Technical Specifications 

• Product Series: SV1 (Single-stage / low flow rotary servo valve) / SV2 (Two-stage / high flow rotary servo valve)

• Representative Nominal Sizes: NG06 (SV1-06), NG10 (SV1-10, SV2-10), NG16 (SV1-16), NG20 (SV2-20)

• Operating Principle: Rotary slide valve mechanism (Drehschieber-Servoventil)

• Nominal Flow Range: From 4 L/min up to 100 L/min (e.g., SV1-10 16 delivers 16 L/min at a $\Delta p$ of 70 bar)

• Max Operating Pressure (Ports P, A, B): 315 bar (31.5 MPa / 4500 psi)

• Max Return Pressure (Port T): Typically up to 50 bar

• Hysteresis: < 1.0% (Delivering exceptional positioning repeatability)

• Fluid Temperature Range: -20°C to +80°C

• Protection Class: IP 65 (Heavy-duty sealed encapsulation for coils and electrical components)

Key Technical Advantages:

• Anti-Jamming Rotary Slide Architecture: Unlike conventional flapper-nozzle servo valves, the SV series utilizes a unique rotary spool design. As the spool rotates, it exhibits a powerful “shearing” and self-cleaning action against fluid impurities, fundamentally eliminating spool stiction caused by particulate contamination and massively boosting dirt tolerance.

• Exceptional Dynamic Response: The internal torque motor directly actuates the rotary spool (in SV1 series), negating intermediate mechanical slop. This architecture yields extremely low latency during high-frequency signal inputs, perfectly aligning with the aggressive real-time adjustment demands of strip guiding systems (EPC/CPC).

• Hardened Wear-Free Construction: The rotary sleeve and spool assemblies are machined from aerospace-grade high-carbon chromium steel, subjected to precision lapping and cryogenic hardening. Micron-level clearance control ensures minimal internal leakage while securing a vast service life despite continuous, high-frequency oscillations.

• Dry Torque Motor Protection: The electromagnetic working area of the torque motor is completely isolated from the hydraulic fluid. This “dry” design prevents magnetic metallic particles from accumulating in the magnetic air gaps, safeguarding the long-term linearity and stability of the electrical-to-mechanical torque conversion.

Application Areas:

• Metallurgical Rolling Mills: Edge Position Control (EPC) and Center Position Control (CPC) guiding systems in hot and cold rolling lines.

• Precision Strip Processing: Coiler and uncoiler tension and positioning control for continuous annealing and galvanizing lines.

• Heavy Forming Machinery: Closed-loop slider synchronization and positioning for large hydraulic press brakes and precision forging presses.

• Paper & Printing Industries: High-speed web alignment and precision tension roller regulation.

Expert Maintenance Tips:

• System Flushing & Zero Calibration: Although highly dirt-tolerant, the hydraulic lines must be thoroughly flushed using a flushing plate prior to initial installation. Once installed and the system reaches normal operating temperature, carefully fine-tune the mechanical zero point on the torque motor to ensure zero cylinder drift when no electrical signal is applied.

• Strict Return Backpressure Control: Ensure the backpressure at the T-port remains stable and below the prescribed limit (typically < 50 bar). Severe return-line pressure pulsations can disrupt the microscopic force balance on the rotary spool, inducing uncommanded fluctuations in output flow.

• Cable Shielding & Grounding: Servo valves process ultra-precise micro-ampere or milli-ampere control signals. In environments with severe electromagnetic interference (e.g., near inverters or massive electric motors), control cables must use high-quality twisted-pair shielding. The shield must be strictly grounded at only one end, preferably at the control cabinet, to prevent ground loops.

Related Models：

SV2-10/64/210/6
SV1-10/8/120/1
SV1-10/8/315/1
SV1-10/48/315/6
SV1-10/16/100/6
SV1/10/16/120/6