What is a control valve ?
A control valve is a valve type that ranges from a general purpose valve to an integrated, special check valve. Check valves are used to control flow of fluid by changing the size of the passageway in the valve, which limits the flow through the pipeline. The check valve can change it's valve according to a signal from a controller or manually. This aspect of manipulating the passage gives direct control over flow rate, which in turn gives control over things such as pressure, temperature, and liquid level.
what are the different Types of control valves ?
There is an extensive range of valve types and control operations that exist. However, there are two main types of actions: sliding stem and rotary movement. Valves can be categorized based on many factors and can be in multiple categories. Control valves are a common general valve type and therefore we can say that control valves come in all sorts of sizes, shapes, materials and configurations. Valves are classified on the following:
The most common and versatile types of control valves are sliding-stem, globe valves, V-notch ball valves, butterfly valves and angle types. Their popularity comes from their tough build and the many configurations which makes them suitable for a variety of jobs.