G631-3004B H40JOFM4VBR Proportional Directional Control Valve (Pilot-Operated)

Parameter Name
Parameter Value
Product Model
G631-3004B H40JOFM4VBR
Manufacturer
MOOG
Product Type
Proportional Directional Control Valve (Pilot-Operated)
Actuation Principle
Proportional solenoid with pilot stage for main spool actuation
Max. Operating Pressure
350 bar (5000 psi)
Nominal Flow Rate (Δp=10 bar)
Specific to spool; for -3004B, typically in the range of 4 L/min (consult datasheet for exact value at rated Δp)
Input Signal
Typically ±10 VDC or 4-20 mA (defined by coil/driver code H40)
Linearity & Hysteresis
< ±3% (typical for G631 series)
Frequency Response (-3 dB)
Moderate (e.g., 10-20 Hz typical, sufficient for many industrial applications)
Electrical Connector
DIN 43650 Form A (JO in suffix indicates connector style)
Spool Type
Proportional, with various overlap characteristics (specific to FM4 code)
Coil Protection Class
IP65 (typical with DIN connector)
Operating Fluid Temperature
-20°C to +80°C
Recommended Filtration
25 µm (β10≥75) or better
Housing Material
Aluminum
Seal Material
Viton (FKM) as indicated by VBR in suffix
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Description

Product Overview
The MOOG G631-3004B H40JOFM4VBR​ is a compact, high-performance proportional directional control valve from Moog’s G631 series, designed to deliver precise and cost-effective flow control in industrial hydraulic systems. This pilot-operated valve translates a variable electrical input signal into a proportional spool displacement, accurately modulating the direction and flow rate of hydraulic fluid to actuators like cylinders or motors. The MOOG G631-3004B H40JOFM4VBR​ is engineered to offer an excellent balance between the dynamic performance of servovalves and the economy of standard proportional valves, making it an ideal solution for a wide array of applications requiring better control than simple on/off functionality but where the extreme bandwidth of a servovalve is not necessary. It acts as a reliable electro-hydraulic interface for implementing sophisticated velocity, pressure, or position control in open or closed-loop systems.
The specific suffix code H40JOFM4VBR​ defines a precise configuration, detailing its coil characteristics (H40), connector type (JO), functional spool variant (FM4), and seal material (VBR for Viton). This tailored configuration allows the MOOG G631-3004B H40JOFM4VBR​ to meet exact application requirements for electrical compatibility, environmental resistance, and hydraulic performance. Its design emphasizes robust construction, ease of installation, and reliable operation in typical industrial environments, providing system integrators with a versatile component to enhance machine accuracy, repeatability, and productivity. The valve’s integrated electronics (if equipped as per suffix) and compact form factor facilitate straightforward integration into both new and modernized machinery.
Technical Specifications
Parameter Name
Parameter Value
Product Model
G631-3004B H40JOFM4VBR
Manufacturer
MOOG
Product Type
Proportional Directional Control Valve (Pilot-Operated)
Actuation Principle
Proportional solenoid with pilot stage for main spool actuation
Max. Operating Pressure
350 bar (5000 psi)
Nominal Flow Rate (Δp=10 bar)
Specific to spool; for -3004B, typically in the range of 4 L/min (consult datasheet for exact value at rated Δp)
Input Signal
Typically ±10 VDC or 4-20 mA (defined by coil/driver code H40)
Linearity & Hysteresis
< ±3% (typical for G631 series)
Frequency Response (-3 dB)
Moderate (e.g., 10-20 Hz typical, sufficient for many industrial applications)
Electrical Connector
DIN 43650 Form A (JO in suffix indicates connector style)
Spool Type
Proportional, with various overlap characteristics (specific to FM4 code)
Coil Protection Class
IP65 (typical with DIN connector)
Operating Fluid Temperature
-20°C to +80°C
Recommended Filtration
25 µm (β10≥75) or better
Housing Material
Aluminum
Seal Material
Viton (FKM) as indicated by VBR in suffix

G761-3034B

Main Features and Benefits

Cost-Effective Performance: The MOOG G631-3004B H40JOFM4VBR​ delivers a compelling performance-to-cost ratio. It provides significantly better control linearity, lower hysteresis, and smoother operation than standard on/off or basic proportional valves, enabling improved process quality and machine performance without the investment associated with full servovalve technology.
Robust and Reliable Design: Built for industrial durability, this valve features a hardened spool and sleeve assembly designed for long service life. The pilot-operated design reduces the solenoid force required, leading to a robust and reliable main stage. The use of Viton seals (VBR) provides excellent compatibility with a wide range of hydraulic fluids, including standard mineral oils and many synthetic esters, ensuring reliability in diverse operating environments.
Ease of Integration and Use: The valve’s compact and modular design allows for easy mounting. The standardized DIN 43650 electrical connector simplifies wiring. When used with a compatible Moog or third-party proportional amplifier, the G631-3004B H40JOFM4VBR​ is straightforward to commission and tune, reducing machine setup time. Its stable performance characteristics also contribute to consistent machine operation over time.
Customized Configuration: The suffix code signifies a valve built to order for specific needs. The H40 coil specification ensures compatibility with the chosen driver’s output. The FM4 spool defines its flow gain and overlap characteristics, allowing it to be optimized for either precise metering or fast response applications. This configurability ensures the valve is well-matched to its intended function within the hydraulic system.
Application Fields
The MOOG G631-3004B H40JOFM4VBR​ is widely used in mobile and industrial hydraulics where proportional control enhances functionality. In mobile equipment, it is commonly found in excavators, telehandlers, and agricultural machinery to provide precise and smooth control of implement movements, such as boom, arm, and attachment functions, improving operator control and machine productivity.
Within factory automation, this valve is applied in material handling systems for controlling the speed of hydraulic motors on conveyors or the gentle acceleration/deceleration of lifting cylinders. It is also used in plastic processing machinery, such as on blow molders for parison control or on extruders for pressure regulation. In test stands for components like shock absorbers or springs, the MOOG G631-3004B H40JOFM4VBR​ provides the precise flow control needed to generate accurate force or displacement profiles. Its robustness also makes it suitable for applications in metal forming and forestry equipment.
Related Products
  • G631-3002B / G631-3008B: Other models in the G631 series with different nominal flow rates, allowing system designers to select the correct size for their actuator flow requirements.
  • G761-3009B: A direct-operated, flapper-nozzle servovalve from the higher-performance G761 series, offering faster dynamic response and higher precision for the most demanding applications.
  • G122-825A or G123-825A: Moog proportional amplifier modules designed to provide the controlled current to the coil of valves like the G631-3004B H40JOFM4VBR.
  • D633 Series: Moog’s high-flow industrial servovalve line, representing the next performance tier for larger, more dynamic systems.
  • G631-3004B with different suffix (e.g., H40JOFM4VPB): A variant of the same base model but with Nitrile (NBR) seals (PB), demonstrating the configurable nature of the product line.
  • RKP Series (Moog): Industrial directional control valves, providing a comparison to simpler, non-proportional valve solutions.
  • High-Pressure Filter Units: Critical system components to maintain fluid cleanliness and protect the sensitive control edges of the proportional valve.

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