Product Introduction: It belongs to the Moog D633 series of direct-acting valves (DDV) with closed-loop position control of the live feedback spool. It is a throttle-type flow control valve that can be used as a two-position two-way, three-position three-way, or three-position four-way valve. It is a key component in electro-hydraulic servo control systems and is widely used in various fields requiring high-precision control.
Technical Specifications: The flow range is 3.8 – 100 l/min (7.0 MPa valve pressure drop). The maximum working pressure is 35.0 MPa. The resolution is less than 0.1%. The hysteresis is less than 0.2%. The frequency response is 40 – 60 Hz (±100% input signal). The working pressure is 14.0 MPa.
Functional Features: The valve adopts an ultra-large flow internal flow channel design, and the X and Y ports can be optionally used for pilot stage external control and external discharge. The design of reducing the driving area of the servo valve spool improves the dynamic response, enabling the smaller pilot stage flow to drive the servo valve spool to move quickly. The fail-safe design ensures that the main servo valve spool is in a known position through the centering spring and seat valve when the slide valve is short-circuited, de-energized, or the oil source loses pressure. The closed-loop control of the main servo valve spool position is realized by an integrated electronic device, ensuring high control precision. In addition, it has the advantages of energy saving, no pollution, strong environmental adaptability, low operating noise, and durability without frequent maintenance.
Application Scenarios: It is widely used in electro-hydraulic servo control systems in aerospace, ships, metallurgy, chemical industry, and other fields. It can be used in position, speed, pressure, and force electro-hydraulic servo systems. For example, in the attitude control system of spacecraft, it can accurately control the position and attitude of the spacecraft; in the rolling control system of metallurgical equipment, it can control the rolling speed and pressure; in the reaction kettle control system of chemical equipment, it can control the pressure and temperature inside the reaction kettle.
