The commonly used control valves can be defined as follows:

a. Depending on Action:

Depending on action there are two types of control valves 1. Air to close 2. Air to close

b. Depending on body:

Depending on body there are 4 types of control valves

1. Globe valves single or double seated

2. Angle valves

3. Butterfly valves

4. Three way valves