What is CV?
CV, also known as Valve Flow Coefficient, is a valve capacity for a liquid in a 1 Lb/Inch² of pressure drop with 100% opening in (GPM). However, there is an equivalent called Kv which, in metric units, is equivalent to the m³ that will flow through the valve in one hour.
The CV information is inscribed on the valve body or in the technical data documents of the equipment. It is important to know it and that the manufacturers report it to facilitate the comparison of capacity between the different products. The “CV” can be found with uppercase “KV”
Foto por Klipartz
What is Pressure Drop?
When a loss of energy occurs due to throttling, change of direction or an impediment in the circulation of the liquid both through the valve, elbows or pipes, it is known as pressure drop. This phenomenon is called head loss.
Quick opening valves are mostly the cause of these effects. The sudden opening and closing are one of the factors that generate it. To regulate the flow, linear valves are the ideal devices to control and diminish or, in some cases, eliminate this effect (see article “Melody unchained from the pipe”). Although they are normally installed according to the pressure loss ratio of the pipe with the valve, with respect to the total dynamic loss in the line.
Foto por ARI-Armaturen
How does the flow control valve work?
A control valve or regulating valve is a device used to control the flow of a fluid and modify the pressure drop, as directed by a signal from a controller.
How is the flow regulated?
The flow rate is regulated with the adjustment accessory, as it easily adapts to the flow conditions. Also the control and adjustment valve can purge the system, an operation that helps to carry out maintenance.
What is a flow valve?
Flow or flow valves vary the amount of compressed air that passes through them, whose action affects the actuation speed of a cylinder or the speed with which a sequence of movements is carried out, thus modifying the flow of pressurized air in both directions.
How is the flow regulation carried out?
Carrying out this process involves continuous control of the drive motor or inlet valve, according to changes in pressure. But once it has been done, minute variations in pressure (from 0.1 to 0.5 bar) must occur according to the amplification of the regulation system and its regulation speed.