What is Flow control valve?

You must have seen the flow control valves at home by now and you are somewhat familiar with it. Its main task is to control the flow of fluid. In this article, we will fully introduce the flow control valves. In fact, you will get acquainted with Flow control valve types and functions. Stay with us.

A flow control valve regulates the flow or pressure of a fluid. Control valves normally respond to signals generated by independent devices such as flow meters or temperature gauges.

Control valves are normally fitted with actuators and positioners. Pneumatically-actuated globe valves and diaphragm valves are widely used for control purposes in many industries, although quarter-turn types such as (modified) ball and butterfly valves are also used.



Typically, for a closed pressure control loop, the pressure in an enclosed volume is controlled. The pressure within the closed volume is measured and used as feedback for the closed control loop. Then the controller sets the position of the flow control valve to change the mass flow into the volume. In this case, the mass flow out of the enclosed volume can be seen as a process disturbance. Even if not measurable, it is important that the system also controls the mass flow out of the enclosed volume. This information can be used directly by the feedforward controller to improve the transient behavior without additional measurements. With this type of feedforward control, the mass flow into the enclosed volume is compensated by the outgoing mass flow, even before the measured pressure changes.



Control valves can also work with hydraulic actuators (also known as hydraulic pilots). These types of valves are also known as automatic control valves. The hydraulic actuators respond to changes of pressure or flow and will open/close the valve. Automatic control valves do not require an external power source, meaning that the fluid pressure is enough to open and close them. Read more here

Types of Flow Control Valves

The most popular flow control valve types are Gate Valves, Needle Valves, Diaphragm Valves, Globe Valves, and Pinch Valves. Now we’ll explain these types in detail and talk about their functions.



  • Pinch Valves
Pinch valves are among flow control valve types that are affordable and popular in the industry. They use flexible elements such as rubber tubes for sealing purposes. Designed to help the valves to tightly seal around entrapped solid with their flexibility, these rubber sleeves are the only moistened part in a pinch valve.
Continue this article in this link. You can also refer to the sources mentioned at the end of this post for further reading.

References:

https://www.linquip.com/blog/flow-control-valve-types-and-functions/

https://en.wikipedia.org/wiki/Flow_control_valve

https://www.wartsila.com/insights/article/next-generation-unic-automation-system-enables-wartsila-31-performance

https://www.homedepot.com/s/Flow%2520control%2520valve?NCNI-5


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