A control valve is a valve used to control the flow of a fluid (usually a gas or liquid) by varying the size of the flow passage as directed by a signal from a controller. This allows the control valve to serve as the "throttle" of a flow system, regulating the flow rate and ensuring that the process operates at the desired conditions. The control valve price in India is variable based on quality. Control valves are used in a wide range of applications, including the control of flow in process industries such as oil refining, chemical processing, water tank automatic valve, and power generation, as well as in building systems such as heating, ventilation, and air conditioning. The water tank automatic valve price in India is also variable. They are also commonly used in water treatment and distribution systems and transportation systems such as pipelines and aircraft. There are several control valves, including globe valves, gate valves, butterfly valves, and ball valves