Description
Product introduction
The MOOG D656-041F-6 is a high-precision electro-hydraulic proportional valve designed to deliver both accurate flow regulation and pressure control within one integrated assembly. Built as part of MOOG’s D656 “PQ” series, the D656-041F-6 integrates spool positioning, feedback sensing and control electronics to form a compact, highly capable actuator interface. With its dual control capability of both flow (Q) and pressure (P), this valve becomes a key component in advanced hydraulic automation systems.
This valve is engineered for demanding industrial automation applications where both the velocity of an actuator (via flow control) and the force or load (via pressure control) must be dynamically regulated. The D656-041F-6 supports standard analog command inputs and is designed for NG10 / ISO 4401 Size 05 mounting, making it suitable for retrofit and new-build machine platforms alike. As part of MOOG’s legacy yet field-supported family, it provides a mature, proven solution for high-duty hydraulic control environments.
When integrated into a motion or process control loop, the D656-041F-6 acts as the hydraulic interface between the electronic command world (from a PLC, DCS or motion controller) and the fluid-power domain — providing precise actuation, repeatability, and system stability. Its role in automation systems is to simplify hydraulic circuitry, increase control accuracy, reduce mechanical complexity, and contribute to higher throughput and better machine performance.
Core advantages and technical highlights
Functional innovation: The D656-041F-6 combines both flow and pressure control in one valve body — eliminating the need for separate flow and pressure modules and simplifying hydraulic design. Its integrated electronics and spool position feedback allow true closed-loop control of hydraulic actuation, offering superior responsiveness and stability compared to open-loop valves.
Performance: With its NG10 / ISO 4401 Size 05 interface and high operating pressure (up to ~350 bar), the D656-041F-6 is well suited for demanding hydraulic loads. The dual function capability enables it to regulate actuator speed, force and position more precisely under varying conditions. The analog command interface (±10 V or 4–20 mA) ensures compatibility with common industrial control systems.
Reliability and robustness: Being part of the D656 “PQ” series, the D656-041F-6 benefits from a mature design with integrated feedback and electronics, which reduce drift, hysteresis and maintenance needs. As a legacy product, MOOG continues to provide spares and service support, ensuring that user investments are protected.
Compatibility and integration ease: The valve shares mounting patterns, hydraulic ports and control interface standards with other valves in the D656 family. This means system integrators and maintenance teams can apply standardized installation, calibration and service procedures. The analog command input further simplifies connection to PLC or motion controller architectures.
System architecture simplification: Because the D656-041F-6 integrates dual regulation functions (flow + pressure) in one module, machine builders can reduce the number of components, hoses, fittings and control loops — thereby reducing cost, footprint and potential failure points. This leads to simplified spares inventory, faster commissioning and more compact designs.
Typical application scenarios
The D656-041F-6 is ideally suited for industrial automation systems where both speed and force control are required simultaneously. In metal-forming machines such as presses or stamping units, the valve regulates the press speed (via flow control) and simultaneously governs clamp or forming force (via pressure control) — enabling high-precision forming cycles. In plastics injection moulding machines it controls injection flow rate and clamping pressure in one integrated hydraulic element.
In test rigs for aerospace, automotive or structural loading, the D656-041F-6 provides fine control of actuator displacement and force applications — maintaining repeatability and high throughput. In marine or offshore hydraulic manifolds, where space and reliability are at a premium, this valve enables compact yet high-performance control of multiple actuators. For retrofit scenarios, the D656-041F-6 enables replacement of older separate flow/pressure valves with a modern consolidated unit, improving performance while minimizing changes to mechanical or electrical layout.
By deploying the D656-041F-6, machine builders and system integrators can achieve faster cycle times, improved control stability, simplified machine hydraulics, reduced maintenance burden and longer operational uptime.
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