What component is unique to servo valves?

Servo valves are specialized components that control the flow of hydraulic fluid in a system and allow for precise movement and positioning. One of the defining features of servo valves is their use of torque motors, which are unique to these types of valves. Torque motors provide the necessary mechanical force to adjust the valve position in response to input signals, allowing for finely-tuned control over the hydraulic fluid flow. This capability is essential for applications that require high precision and responsiveness, such as in robotics or CNC machines.

In contrast to torque motors, components like LVDTs (Linear Variable Differential Transformers) are often used for position feedback but do not contribute directly to the actuation of the valve. PLCs (Programmable Logic Controllers) are used for automation and control but are not intrinsically part of the servo valve design. While infinite positioning suggests continuous control over position without discrete steps, torque motors enable such operation through their design but do not define the unique nature of the servo valve itself. Hence, torque motors play a crucial role in making servo valves distinct in operation and functionality.