Product Description
D633-7398 A08KO4M0VMJ Servo Valve
The D633-7398 A08KO4M0VMJ is a high-performance direct drive servo valve (DDV) with internal spool position electrical feedback for precise flow control in demanding hydraulic applications.
Key Features & Benefits
- Direct Drive Technology: Utilizes a permanent magnet linear force motor that directly drives the spool bidirectionally from the spring-centered position, unlike proportional solenoids that can only produce unidirectional driving force.
- Closed-Loop Control: Features integrated electronics with spool position sensor (LVDT) and pulse width modulation (PWM) drive circuit for exceptional accuracy and resolution.
- Superior Performance: The electrical feedback of spool position combined with the high driving force linear force motor provides excellent resolution and superior control performance.
- Versatile Application: Suitable for three-way, four-way, and 2×2 way throttling type flow control in electrohydraulic position, velocity, pressure or force control systems with high dynamic response requirements.
- Standard Compliance: Built to ISO 4401 mounting standards for seamless integration into existing hydraulic systems.
Operating Principle
The D633 series servo valve operates through closed-loop spool position control. An electrical signal corresponding to the desired spool position is input to the integrated circuit board, which converts it to a PWM current to drive the linear force motor. The oscillator excites the spool position sensor (LVDT) to produce an electrical signal proportional to spool displacement. The demodulated spool position signal is compared with the command signal, and the resulting error signal generates current in the force motor coil to move the spool to the specified position, reducing position error to zero. This results in spool displacement proportional to the command signal.
Typical Applications
- Injection and blow molding equipment
- Die casting machines
- Presses and heavy industrial machinery
- Paper and wood processing equipment
- Electrohydraulic position, velocity, pressure or force control systems requiring high dynamic response
Important Technical Notes
- The valve is a throttling device for flow control. When the spool position remains unchanged but the pressure drop across the throttling port changes (due to factors such as oil viscosity changes, system pressure changes or load pressure changes), the load flow through the valve will change accordingly.
- Before installing the servo valve, the hydraulic system must be thoroughly cleaned.
- The valve features 24V power supply integrated electronics board for reliable operation.
Servo valve D633-7398 A08KO4M0VMJ
Model:Servo valve D633-7398
Type:D633-7398
