Hydraulics and Pneumatics: Unit II: Hydraulic Actuators and Control Components

servo valves

Hydraulic Actuators and Control Components - Hydraulics and Pneumatics

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All the valves described in this Chapter and Chapter 12 are finite position valves.

II. SERVO VALVES

1. What are Servo Valves ?

• All the valves described in this Chapter and Chapter 12 are finite position valves. That means, these valves are built around combinations of basic open and shut valves. So whenever the position of a cylinder or the speed of a motor is to be controlled very accurately, an infinite position valve is required.

• A servo valve is nothing but a DC valve having infinitely variable positioning capability. In other words, servo valve is an infinite position valve.

• When servo valves are coupled with feedback devices, they can be used to control the position, velocity, and acceleration of the actuator accurately.

• Servo valves are used to achieve automated stepless control of pressure and flow rate in fluid power systems.

2. Types of Servo Valves

The important types of servo valves are given below :

1. Mechanical-type servo valve, and

2. Electrohydraulic servo valve.

(i) Single-stage servo valve,

(ii) Two-stage servo valve,

(iii) Jet pipe servo valve, and

(iv) Flapper jet servo valve.

Hydraulics and Pneumatics: Unit II: Hydraulic Actuators and Control Components : Tag: : Hydraulic Actuators and Control Components - Hydraulics and Pneumatics - servo valves

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ME3492 4th semester Mechanical Dept | 2021 Regulation | 4th Semester Mechanical Dept 2021 Regulation