# What is a CV ? (Flow Coefficient ) . Free software to calculate Control Valve CV

**URL:** <https://forumautomation.com/t/what-is-a-cv-flow-coefficient-free-software-to-calculate-control-valve-cv/430>\
**Category:** Software and Tools\
**Created:** [May 23, 2015, 10:20pm UTC](https://forumautomation.com/t/what-is-a-cv-flow-coefficient-free-software-to-calculate-control-valve-cv/430 "2015-05-23T22:20:29Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![denizen](https://forumautomation.com/letter_avatar_proxy/v4/letter/d/848f3c/32.png) [@denizen](https://forumautomation.com/u/denizen)\
**Post date:** [May 23, 2015, 10:20pm UTC](https://forumautomation.com/t/what-is-a-cv-flow-coefficient-free-software-to-calculate-control-valve-cv/430/1 "2015-05-23T22:20:30Z")

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CV is actually a flow coefficient which is really speaking to the capacity of the valve.

![image](https://cdn.forumautomation.com/original/2X/9/9c10d3d18a3991360784364efb55e5ae15cb1d11.jpeg)

If the valve has a CV of 20 that really is saying we can pass 20 gallons per minute of water with one pound pressure drop.

I would like to introduce one web based application which will help you to calculate the flow coefficient or CV.

ValveSmart . You can access valvesmart from the following link . [www.valvesmart.com](http://www.valvesmart.com)

Enter the required details on the sheet and click on calculate button.

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**Author:** ![Rabert](https://forumautomation.com/user_avatar/forumautomation.com/rabert/32/6784_2.png) [@Rabert](https://forumautomation.com/u/Rabert)\
**Post date:** [August 30, 2024, 2:44pm UTC](https://forumautomation.com/t/what-is-a-cv-flow-coefficient-free-software-to-calculate-control-valve-cv/430/2 "2024-08-30T14:44:55Z")

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**For both liquids and gases, the formulas for calculating the control valve CV are described below:**

 ![image](https://cdn.forumautomation.com/original/2X/d/dc41f1240ae9639f7ca3425b003b8eb0abc78543.jpeg)