Original Imported Moog Servo Valve Controls Pressure and Flow Rate with Advanced Alloy Steel/Cast Iron Construction

J761-001 D662Z4341K
D661-4506C D664Z4306K
D663Z4305K G2L20G422-615
G3L15G423-416 G3L25G423-612
G040-125-001 G123-815A001 Original imported hydraulic servo valve MOOG controls pressure and flow rate

FAQ:

Most MOOG servo valves are two-stage valves. In the first stage, an electrical signal is sent to a torque motor, which moves a flapper between two nozzles, creating a pressure differential. This pressure difference acts on a spool (the second stage), moving it to control the main hydraulic flow to the load. The valve may use mechanical feedback (e.g., a spring) or an electrical feedback system (LVDT sensor) to ensure the spool position accurately corresponds to the input command signal .

2. What are the main advantages of MOOG Servo Valves?

MOOG servo valves are known for several key advantages :

• High-Precision Control: They offer exceptional control accuracy, which can reach about 0.1%, suitable for demanding applications.

• High Dynamic Performance: They feature fast response times, often in the millisecond range, allowing for high-speed and high-precision control.

• High Reliability and Stability: Designed with advanced technology and materials for stable long-term operation, even in harsh environments.

• Variety of Designs: Available in various series, including standard two-stage, high-performance two-stage and three-stage, and direct-drive valves (DDV) to meet different performance needs.

• Fail-Safe Functionality: Some models include a fail-safe feature that moves the valve to a safe position in case of a power failure or system fault .

Series and Specifications

3. What are the main series of MOOG Servo Valves?

MOOG offers a comprehensive range of servo valves. Some prominent series include :

• G761 Series: A popular two-stage flow control valve with mechanical feedback. Known for fast response and robustness, it is widely used in various industrial applications .

• D630 Series (e.g., D634, D636, D637): These often feature direct drive by a linear force motor (DDV) or advanced control. The D636/D637 series, for example, comes with a fieldbus interface and integrated digital electronics for high flexibility .

• D660, D661, D662 Series: Classic two-stage servo valves with a wide range of industrial uses .

• 72 Series: Standard response two-stage valves with a field-replaceable pilot valve filter and the option for external pilot pressure control .

The table below summarizes the key features of some common series:

Series Example Key Characteristics Typical Applications / Features
G761-3003B Two-stage, mechanical feedback, high response Industrial machinery (e.g., metal forming presses)
D634-341C Pilot-operated, closed-loop spool control with LVDT Precision control systems
D636/D637 Direct Drive (DDV), linear force motor, fieldbus interface No pilot leakage, high dynamics, programmable
72 Series Standard response, replaceable pilot filter Power generation (steam/gas turbines)

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