D061-9411 Moog Pilot Valve Servo Jet D061 Series

Product Overview

The D061-9411, D061-8411, D061-9311, D061-8312, D061-9310, D061-8310, and D061-8621C are core models within the Moog Inc. D061 Series Pilot Valve family, manufactured by Moog Industrial Motion Control Group. The D061 series belongs to Moog’s pilot-operated servo/proportional valve family for high-performance electro-hydraulic control, specifically designed for industrial applications requiring precise position, velocity, pressure, or force control.

D061 series servo-proportional control valves are applicable to two-way, three-way, four-way, and five-way throttling-type flow control valves, suitable for electro-hydraulic position, velocity, pressure, or force control systems, and other control applications requiring high dynamic response. The series employs a new Servo Jet pilot stage, improving the dynamic characteristics of the complete valve; the large-flow internal passage design substantially increases the valve’s rated flow. Main spool position is electrically fed back via a displacement sensor, with an integrated electronic amplifier performing closed-loop control of spool displacement. The fail-safe function ensures the machine equipment remains in a safe position in the event of an unexpected power failure.

The D061-9310 is a pilot valve specifically developed by Moog for use in conjunction with the D663 main valve, belonging to servo valves used in electro-hydraulic control systems for precise control of position, velocity, pressure, and force. The D061-9311 has a maximum operating pressure of 30 MPa, flow range of 5-80 L/min (based on specific operating conditions), frequency response of 45-70 Hz. The D061-9310 J15KOBM4HN1 spool stroke range corresponds to a current of 4 to 20 mA, with a center position current of 12 mA, where 20 mA corresponds to 100% full valve opening with P-to-A and B-to-T flow paths.

As drop-in replacements, this pilot valve series is fully compatible with the OEM Moog specification in mounting interface, electrical connection, and performance characteristics. Every unit undergoes 100% simulation-based testing prior to shipment, covering null stability, flow linearity, step response, and internal leakage.

Technical Specifications

All parameters below are based on Moog official installation instructions (D061-6/-7/-8/-9 series) and verified supplier technical pages:

D061 Series Common Specifications:

• Product Series: Moog D061 Series Pilot Valve

• Brand: Moog Inc.

• Product Type: Pilot-operated servo/proportional control valve

• Pilot Stage Type: Servo Jet pilot stage / nozzle-flapper torque motor

• Power Stage Type: Precision spool assembly

• Spool Function: Two-way, three-way, four-way, or five-way throttling-type flow control valve

• Control Function: Position, velocity, pressure, or force control

• Maximum Operating Pressure: 350 bar (5075 psi)

• Pilot Supply Pressure: 10-15 bar (145-217 psi), separately filtered

• Rated Flow: 4 – 63 L/min (depending on spool configuration)

• Rated Pressure Drop: 35 bar per control land

• Maximum Flow: 75 L/min (series maximum)

• Frequency Response: 45-70 Hz (D061-9311)

• Step Response: Approx. 4 – 16 ms

• Hysteresis: < 1.5% (D061-9311)

• Resolution: < 0.2% (D061-9311)

• Command Signal: ±10 V or ±40 mA (typical)

• Rated Current: 30 – 150 mA

• Coil Configuration: Single or dual coil options

• Electrical Connector: Standard industrial servo valve connector, shielded cable connection

• Mounting: ISO standard manifold mounting (ISO 4401), any orientation

• Hydraulic Fluid: Mineral oil-based hydraulic fluid, per DIN 51524 parts 1-3 (ISO 11158)

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

• Viscosity Range: 5 – 400 mm²/s, recommended 15 – 45 mm²/s

• Recommended Oil Cleanliness: ≤ 10 μm absolute filtration

• Valve Body Material: Aluminum or steel

• Weight: Approx. 1.0 – 1.7 kg

• Protection Class: IP65 (with sealed connector)

• Mounting Screw Torque: M5 × 15 / M5 × 30, torque 4.5 Nm

D061-9310 J15KOBM4HN1 Specific Parameters:

• Nominal Pressure: 35 MPa

• Suitable Media: Oil

• Spool Stroke Corresponding Current: 4 to 20 mA, center position 12 mA

• Drive Type: Electronic drive (hydraulic pilot valve)

D061-9411 Specific Parameters:

• Type Code: J15Koba4Vn1

Note: Specifications are based on Moog official installation instructions (D061-6/-7/-8/-9 series) and verified supplier technical pages (RS Modules, Yanhui Hydraulic, K-Wang, etc.). The D061 series includes multiple sub-series (D061-6/-7/-8/-9); different models vary in rated flow, command signal, electrical connector, and seal material. Always verify against the complete model code and consult the latest Moog official technical documentation during selection.

Key Technical Advantages

1. Servo Jet Pilot Stage for High Dynamic Response and Contamination Tolerance

The D061 series employs the new Servo Jet pilot stage technology, significantly improving the dynamic characteristics of the complete valve. The servo jet pipe pilot stage has a very high undamped natural frequency (500 Hz), resulting in high dynamic response of the valve. Advantages of Moog’s servo jet pipe pilot valve include: significantly improved flow utilization efficiency (over 90% of pilot stage flow is utilized), contributing to reduced energy consumption — a particularly notable advantage for machines using multiple servo-proportional valves. Compared with conventional nozzle-flapper pilot stages, the jet pipe configuration provides greater tolerance to fluid contamination, extending valve service life in industrial environments.

2. High-Precision Closed-Loop Control with Electrical Feedback System

The D061 series main spool position is electrically fed back via a displacement sensor, with an integrated electronic amplifier performing closed-loop control of spool displacement. The valve offers excellent linearity, low hysteresis, and outstanding repeatability, maintaining stable performance in demanding environments. The D061-9311 achieves hysteresis below 1.5%, resolution below 0.2%, and frequency response of 45-70 Hz, satisfying precision position, velocity, pressure, or force control requirements. The spool stroke range corresponds to a current of 4 to 20 mA with a center position current of 12 mA, facilitating system integration and signal processing.

3. Fail-Safe Design and High Reliability

The series features fail-safe functionality, ensuring the machine equipment remains in a safe position in the event of an unexpected power failure. The compact structure and high dynamic response characteristics provide stable output characteristics under complex operating conditions, forming a complementary control ecosystem with Moog’s D661/D660 series. The D061-9310 is a pilot valve specifically developed by Moog for use with the D663 main valve, enabling precise position, velocity, pressure, and force control in electro-hydraulic control systems, with system reliability validated through extensive industrial applications.

4. Large-Flow Internal Passage Design with Compact Structure

The D061 series features large-flow internal passage design, substantially increasing the valve’s rated flow. The series rated flow range is 4 – 63 L/min (depending on spool configuration), with maximum flow up to 75 L/min, satisfying control requirements from medium to larger flow hydraulic systems. The compact modular design makes the valve lightweight and small (approx. 1.0 – 1.7 kg), suitable for space-constrained installations. The D061-8312 features a compact design suitable for hydraulic systems with limited space, performing well in construction, agriculture, and manufacturing hydraulic systems.

5. 100% Simulation-Based Testing and Drop-In Interchangeability

Every D061 series pilot valve undergoes 100% simulation-based testing prior to shipment. Test protocols cover null stability, flow linearity, step-response verification, and internal leakage detection. As drop-in replacements, the pilot valve series is fully compatible with the OEM Moog specification in mounting dimensions (ISO 4401 standard interface), electrical connection (standard industrial servo valve connector), and performance characteristics, enabling direct replacement of the original valve. The series is widely applied in plastic machinery, die casting machines, heavy industry, and other fields, with demonstrated performance advantages in practice.

Application Areas

• Injection Molding Machines: Precision velocity and pressure control during injection for consistent part quality and improved production efficiency

• Die Casting Equipment: High-speed dynamic pressure regulation and real-time switching control

• Steel Mill Rolling Stands: Precision position and pressure closed-loop control for rolling mill hydraulic gap systems

• Continuous Casting Machines: Mold level control and strand thickness regulation

• Turbine Control Systems: Precision control of electro-hydraulic servo actuators

• Industrial Automation Lines: Integration with PLC and motion controllers for precision position, velocity, or force control

• Material Testing Systems & Hydraulic Test Benches: Precision control for electro-hydraulic servo loading systems

• Precision Machine Tools: Flow and direction control for hydraulic feed axes

• D663 Main Valve Companion Systems: Standard pilot control valve for D663 main valves

Expert Maintenance Tips

Pre-Installation Checks:

• Verify the manifold mounting surface conforms to ISO 4401 standard; surface roughness meets requirements

• Flush all piping with clean hydraulic fluid prior to installation; ensure system cleanliness reaches ISO 4406 16/14/11 or better (pilot supply requires NAS 1638 Class 5 or better)

• Inspect O-ring seals for damage and confirm compatibility with the hydraulic fluid in use

• Use M5 × 15 or M5 × 30 socket head screws (grade 10.9, per EN ISO 4762), tightened diagonally in alternating sequence to 4.5 Nm torque

Operational Maintenance:

• Use a 10 μm or finer precision filter, specified without bypass and equipped with a contamination indicator

• Recommended fluid: mineral oil-based hydraulic fluid per DIN 51524 parts 1-3 (ISO 11158)

• Maintain operating viscosity within 5 – 400 mm²/s (15 – 45 mm²/s recommended)

• Maintain fluid temperature within -20°C to +80°C; avoid overheating that degrades fluid quality

• Maintain pilot supply pressure within 10-15 bar; ensure pilot supply is separately filtered

• Periodically verify electrical connector contact integrity; confirm shielded cable connection is sound

• Valve may be mounted in any orientation (fixed or movable); ensure secure installation free of vibration

Troubleshooting Guide:

• Spool fails to actuate or responds abnormally: Check command signal reaches the valve (±10 V / ±4-20 mA), measure coil resistance against rated range (30 – 150 mA), confirm electrical connector engagement is reliable

• Null-point drift: After ruling out fluid contamination, verify displacement sensor feedback signal integrity; check feedback wire for deformation or wear

• Insufficient flow: Confirm system supply pressure is within 350 bar allowable range; check spool metering edges for partial blockage by contaminant particles

• Slow response: Check system cleanliness level; verify pilot stage jet pipe is not partially blocked by contaminant particles

• Abnormal pilot pressure: Check pilot supply pressure is within 10-15 bar range; verify pilot filter is not clogged