Guangdong Yanhui Hydraulic Co., Ltd. is one of the leading manufacturers and suppliers of moog d635 hydraulic servo valve in China. We warmly welcome you to wholesale bulk moog d635 hydraulic servo valve for sale here from our factory. If you have any enquiry about pricelist and quotation, please feel free to email us.
Product Overview
▔▔The Moog D635 Direct-Drive Servo Valve is engineered to bridge the gap between traditional proportional valves and high-end servo valves. By combining digital onboard control electronics with a highly capable linear force motor, the D635 series achieves precise spool position control using closed-loop internal feedback via an LVDT (Linear Variable Differential Transformer).
Key Advantages
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Direct-Drive Actuation: Powered by Moog's permanent magnet Linear Force Motor (LFM), delivering high driving forces directly to the spool without pilot oil pressure.
Fail-Safe Operation: Features an automatic mechanical fail-safe position (center, open, or closed) during electrical power loss or system pressure drops.
Energy Efficient: Ultra-low continuous current draw compared to traditional pilot-operated valves.
High Dynamic Response: Rapid step-response times and precise frequency response suitable for high-speed closed-loop control.
Integrated Digital Electronics: Onboard digital electronics ensure high repeatability, negligible hysteresis, and minimal thermal drift over long operating hours.
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Technical Specifications
▔▔| Parameter | Specification / Value |
| Valve Design | Direct-Drive, Single-Stage Servo Proportional Valve |
| Actuator Type | Moog Permanent Magnet Linear Force Motor (LFM) |
| Rated Flow (at $\Delta p$ = 35 bar per land) | 5 L/min to 100 L/min (1.3 to 26.4 gpm) |
| Maximum Operating Pressure | Up to 350 bar (5,075 psi) |
| Mounting Pattern | ISO 4401 Size 03 (NG 6) or Size 05 (NG 10) |
| Response Time (0 to 100% Step Input) | Approx. 8 – 15 ms (depending on size/flow rating) |
| Hysteresis | < 0.1% |
| Threshold / Resolution | < 0.05% |
| Supply Voltage | 24 V DC (18 to 32 V DC) |
| Signal Input Options | ±10V,4-20mA |
| Operating Temperature Range | -20°C-80°C |
| Fluid Viscosity Range | 15 to 400m㎡ |
| Fluid Cleanliness Requirement | ISO 4406 Class 18/16/13 (recommended filter ≤10um) |
Applications
▔▔| Industry / Application Field | Specific Function & Benefit |
| Injection Molding & Die Casting | Precise closed-loop control of injection speed, pressure profiling, and mold clamping forces. |
| Metal Forming & Press Automation | Provides rapid response and high accuracy for positioning servo presses and hydraulic bending machines. |
| Testing Machines & Simulators | Delivers high frequency response needed for flight simulators, fatigue test rigs, and automotive test benches. |
| Power Generation & Turbines | Controls steam/gas turbine bypass valves and governor actuators with high reliability and fail-safe positioning. |
| Wood & Paper Processing | High-precision position and thickness control in hydraulic calenders and presses under continuous operation. |
Related Models
▔▔| Model Number | Type / Stage | Nominal Flow Range | Key Characteristics |
| Moog D633 Series | Direct-Drive (NG 6) | Up to 40 L/min | Compact size, high dynamics, ISO 4401-03 pattern |
| Moog D634 Series | Direct-Drive (NG 6 / NG 10) | Up to 100 L/min | Higher flow capability with integrated digital electronics |
| Moog D635 Series | Direct-Drive (NG 6 / NG 10) | 5 – 100 L/min | Advanced fieldbus options, customizable digital parameters |
| Moog D661 Series | 2-Stage Pilot Operated | Up to 250 L/min | Servojet or nozzle-flapper pilot stage for high-flow control |
| Moog D638 Series | Direct-Drive with Fieldbus | Up to 100 L/min | Integrated CANopen/EtherCAT interface for Industry 4.0 |
FAQ
▔▔Q1: What makes a direct-drive valve like the D635 different from a traditional pilot-operated servo valve?
A: A direct-drive valve actuates the spool directly using an electromechanical force motor, without relying on pilot hydraulic pressure. This allows the valve to operate reliably even at low system pressures, reduces internal leakage, and eliminates pilot-stage contamination clogging.
Q2: What happens to the Moog D635 valve if electrical power is lost?
A: The D635 is equipped with a mechanical fail-safe spring. In the event of a power outage or control signal loss, the spool is automatically driven to a predefined fail-safe position (such as center-closed or fail-open), protecting machinery and operators.
Contact Us
▔▔Request a Quote Today to ensure your hydraulic system performs at its best with genuine components from Yanhui Hydraulic.
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