Product Introduction: The D633-303B is a direct-acting servo valve (DDV) with closed-loop spool position control, designed for high-dynamic-response applications. It integrates a linear force motor and electronic amplifier, delivering precise flow control without a pilot stage. Its robust design ensures reliability in harsh industrial environments.
Technical Specifications: The maximum operating pressure is 350 bar (5,000 psi). The rated flow is 3.8 to 100 l/min (1 to 26.4 gpm) at 70 bar (1,000 psi) pressure drop. The step response time is ≤20 ms, with a frequency response of 40 to 60 Hz. It operates on 24 VDC and accepts ±10 V or 4-20 mA signals. The valve weighs 6.3 kg and features ISO 4401 mounting.
Functional Features: Direct drive by a linear force motor provides high power density and fast response. Closed-loop control via a displacement sensor ensures precision, with hysteresis <0.2% and resolution <0.1%. It requires no pilot oil, reducing system complexity and energy use. The valve’s fail-safe design returns the spool to a safe position during power loss, enhancing system safety.
Application Scenarios: Used in metal rolling mills to control roll position and pressure, ensuring uniform material thickness. In injection molding machines, it regulates screw speed and injection pressure for consistent part quality. It also controls actuators in flight simulators, replicating realistic aircraft movements.
