Product Introduction: It is a direct-acting servo valve (DDV) under Moog’s D663 series, with closed-loop position control of the live feedback spool. It is a throttle-type flow control valve that can be applied to three-way, four-way, and 2×2-way valves. The valve integrates a closed-loop spool position control circuit board and a pulse width modulation (PWM) drive circuit, which has the advantages of high control precision and reliable operation.
Technical Specifications: The valve port diameter is 11.5 mm (0.45 inches); the driving method is direct drive by a permanent magnet linear force motor; it has no pilot stage; the weight is 6.3 kg (13.9 ib); the rated flow is 60/100 l/min (15.8/26.3 gpm) (±10%) when the pressure drop per throttling edge is 35 bar (500 psi); the maximum flow of the valve is 185 l/min (48.8 gpm); the maximum working pressure of ports P, A, and B is 350 bar (5000 psi); the maximum working pressure of port T (internal discharge) is 50 bar (715 psi); the maximum working pressure of port T (Y port drain) is 350 bar (5000 psi); the installation mode conforms to ISO 4401-05-05-0-94.
Functional Features: Driven by a permanent magnet linear force motor, it has high driving power and can flexibly drive the spool to move in two directions from the spring-centered position, overcoming the limitation that traditional proportional solenoid valves can only produce one-way driving force; no pilot oil source is required, which simplifies the system structure; the dynamic performance is not affected by pressure changes, ensuring stable operation under different pressure conditions; it has low hysteresis and high resolution, which can realize precise control; the standardized spool position detection signal can be used to obtain the operation status of the system, which is very beneficial to the maintenance of the valve; it has an electrical zero adjustment function; in case of power failure, cable damage, or emergency stop, the spool will automatically return to the spring-centered position without external force, ensuring the safety of the system.
Application Scenarios: It is suitable for electro-hydraulic position, speed, pressure, or force control systems that require high dynamic response, such as the servo control system of precision machine tools, which controls the feed movement of the tool to ensure processing accuracy; it is used in the hydraulic control system of semiconductor equipment to realize the micro-feed control of the wafer stage; it is also applied in the control system of medical equipment, such as the precise control of the movement of the bed of CT machines and nuclear magnetic resonance equipment.
