Product Overview The Moog D663 Series valves are throttle valves for 2-, 3-, 4-, and 5-way applications. These valves are engineered to control position, velocity, pressure, and force in electro-hydraulic systems with high dynamic response requirements. The core advantage of the D663 lies in its ServoJet® pilot stage, which utilizes a jet pipe principle. This design reduces the valve’s internal leakage (pilot flow) significantly, lowering energy consumption while providing a high pressure recovery (over 80% Δp) for enhanced spool driving force and chip-shearing capability.
Why Choose Moog D663?
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Rugged & Reliable: The ServoJet pilot stage has larger internal clearances than nozzle-flapper valves, making the D663 highly resistant to oil contamination and reducing downtime.
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Integrated Intelligence: On-board electronics (OBE) close the position loop for the main stage spool, simplifying system integration and offering M12 or standard connector interfaces.
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High Dynamics: The D663 offers excellent step response times (13-37 ms for 0-100% step), ensuring tight control in rapid-cycle machinery.
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Energy Efficient: The reduced pilot flow requirement means less hydraulic energy is wasted as heat, improving overall system efficiency.
D663 vs. D664: While both are ISO Size 08 (NG25) valves, the D663 is optimized for a rated flow of 350 l/min, whereas the D664 uses a modified spool/bushing design to achieve higher flows of 550 l/min. Choose D663 for standard high-flow applications and D664 when maximum throughput in a Size 08 footprint is required.
Common Applications:
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Plastic Machinery: Injection molding (Filling/Holding), Blow molding.
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Metal Forming: Die casting machines, Hydraulic presses.
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Heavy Industry: Steel mill gap control, Rolling mills.
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Wood Processing: Lumber processing machinery.
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Test Simulation: Vibration and fatigue testing systems.
| Specification | Value / Description |
| Product Type | Pilot Operated Servo Proportional Valve |
| Series | D663 Series |
| Mounting Pattern | ISO 4401 Size 08 (NG25) |
| Rated Flow ($Q_N$) | 350 l/min (92 gpm) @ $\Delta p$ 35 bar per land |
| Max. Flow ($Q_{max}$) | 1500 l/min (396 gpm) |
| Operating Pressure ($p_{max}$) | 350 bar (5000 psi) – Ports P, A, B, X |
| Pilot Stage | ServoJet® (Standard) |
| Response Time (0-100%) | 13 – 37 ms (depending on pilot pressure) |
| Supply Voltage | 24 VDC (18 – 32 VDC) |
| Command Signals |
Analog: ±10 V, ±10 mA, 4-20 mA Fieldbus: EtherCAT, Profibus, CANopen (Optional) |
| Fluid Temperature | -20°C to +80°C |
| Common Model Codes |
D663-4xxx (Standard Series) D663-Zxxxx (Custom/Special) D663-4002 (L03KABM4NSM5-O) D663-4711 (Common replacement) Note: The “Z” usually denotes a specific customer modification. |
Model Code Breakdown Example
Example: D663-4006 / L03HABM4NSM2-O
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D663: Valve Series (Size 08, 350 l/min)
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L: Spool Type (e.g., L = Linear characteristic)
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03: Rated Flow Code (Specific to D663 flow rating)
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H: Bushing/Spool Seal (e.g., H = High precision)
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A: Internal Pilot Supply (Supply X, Drain Y)
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B: Pilot Stage Type (ServoJet)
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M: Solenoid / Electronics Type
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4: Signal Input (e.g., 4 = ±10V)
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N: Connector Type (e.g., N = 6+PE)
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