MSK071D

Product Overview

The MSK071D series belongs to the high-performance Rexroth-compatible MSK family, engineered specifically as a high-response electro-hydraulic proportional/servo control valve. Designed for high-precision motion and pressure regulation, this series delivers exact flow distribution, ultra-low hysteresis, and high dynamic response in demanding closed-loop hydraulic systems. It is ideally suited for high-accuracy electro-hydraulic control scenarios, including position, velocity, and force control in automated heavy machinery.

Key Advantages

• Exceptional high-frequency response for real-time dynamic motion control.
• Low hysteresis and high linearity ensuring micro-meter precision repeatability.
• Rugged construction designed for reliable performance in harsh, continuous-duty industrial environments.
• Optimized spooled valve geometry ensuring minimal internal leakage and maximum power density.

Technical Specifications

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Configuration Options

• Spool & Sleeve Structure: Precision-lapped 4-way spool and sleeve design with linear valve opening characteristic. Zero-overlap (critically lapped) design available for high-gain closed-loop positioning.
• Control Mechanism: High-performance torque motor with internal mechanical feedback or integrated electronic position loop control.
• Feedback Mechanism: Mechanical feedback wire or integrated electronic linear variable differential transformer (LVDT) position sensor.
• Flow Options: Available in rated flow capacity options of 5 L/min, 10 L/min, 20 L/min, 40 L/min, and 60 L/min.
• Mounting Pattern: Standard ISO 4401-03 / CETOP 03 (NG6) subplate mounting interface.
• Electrical Configuration: 6-pin or 7-pin industrial circular connector with IP65 ingress protection rating. Input signal choices include +/-10 mA, +/-15 mA, +/-10 V, or 4-20 mA.

Key Materials and Components

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• Valve Body: High-strength ductile iron casting providing elevated pressure rating and structural rigidity to prevent internal deformation under maximum working pressure.
• Spool and Sleeve Set: Hardened alloy steel, precision ground and lapped to micrometer tolerances to resist erosive fluid wear and maintain zero-leakage performance.
• Internal Seals: Fluorocarbon (FKM/Viton) O-rings standard, offering excellent chemical compatibility with synthetic fluids and high operational temperatures.
• Torque Motor Flexure Tube: High-fatigue-strength alloy steel ensuring reliable operation over millions of dynamic full-stroke cycles.

Packaging and Transport Protection

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• Individual Industrial Packaging: Each MSK071D valve is thoroughly flushed, vacuum-sealed in a anti-corrosive VCI plastic bag, and mounted inside a heavy-duty customized foam mold.
• Protection Features: Ports are sealed with dedicated protective oil plugs to avoid contaminant ingress during transit. Moisture-absorbing desiccant pouches are included in every box.
• Bulk Packaging: Multi-unit orders are packed in reinforced, double-walled corrugated cartons or export-grade fumigation-free wooden crates, strapped and palletized to resist vibration, moisture, and shock during ocean or air freight.

Applications

• Servo Hydraulic Testing Systems: Used for dynamic actuator control in fatigue testing machines, providing micro-second pressure and position feedback for structural durability testing.
• Metallurgical Rolling Mills: Used in automatic gauge control (AGC) cylinders to maintain ultra-fine metal sheet thickness under high-speed rolling loads.
• Injection Molding Machinery: Regulates high-speed mold clamping speed and injection force profiles to eliminate flash and material stress in precision plastic components.
• Steam & Gas Turbine Governors: Controls electro-hydraulic actuator movement to regulate main steam valve openings for precise generator frequency tuning.

Related Models

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FAQ

Q1: Can the MSK071D replace older or obsolete servo valves on existing machinery?

A1: Yes, the MSK071D is designed with standard ISO 4401-03 subplate interfaces and standard signal configurations, making it a direct drop-in replacement for many common industrial servo valves.

Q2: What cleanliness level is required for hydraulic oil used with MSK071D?

A2: Due to micro-inch clearances in the spool and sleeve assembly, hydraulic fluid must meet or exceed ISO 4406 Class 14/11/08 (or NAS 1638 Class 5). A 3-micron absolute pressure line filter upstream of the valve is strongly recommended.

Q3: What types of hydraulic fluid are compatible with this valve?

A3: The MSK071D is compatible with standard mineral-based hydraulic oils (HLP/HVLP) and synthetic ester fluids. For phosphate ester or flame-resistant fluids, customized seal configurations are available upon request.

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