Control valve

Control valve 

Control valve is a power operated device to control fluid flow.

Control valve is capable of modulating flow at varying degrees between minimum flow and full capacity in response to a signal from the controlling system.

Control valve mainly classified by their functions as "on-off" type or "flow regulating" type.

Control valve is comprised of an actuator mechanism that is capable of changing the position of flow controlling element in the valve. The control valve modulates or controls flow through movement of a valve plug in relation to the port's located in valve body. The control valve plug is attached to a stem of valve. The actuator, which can be pneumatically operated or electrically operated. The actuator response or responds to an external signal which usually comes from a controller. 

Basic valve types 

• Ball valves 
• Butterfly valves
• Globe valves
• Gate valves