How to calculate valve size using Kv values - Tameson
In this video, Max will discuss the correct way to calculate the right valve size for your application using the Kv values. View our valve selection here ► https://tameson.com/valves/?utm_sourc...
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Timecodes:
00:00 - Intro
00:08 - What is a Kv value?
00:31 - Cv value
00:46 - How to calculate the Kv value of a valve
01:23 - Kv value in a closed system
01:42 - Kv value for gasses and other liquids
01:51 - Kv value calculator
02:20 - Outro
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Countries that use the imperial system use a slightly different value, the Cv value. The Cv value is defined as the flow rate of water in gallons per minute at a temperature of 60 degrees Fahrenheit at a pressure drop of 1 psi. The Kv and Cv values are related as follows, Cv is approximately 1.15 times the Kv.
The Kv value indicates how much water flows through a valve at a pressure drop of 1 bar. This is indicated in cubic meters per hour, but can easily be converted to liters per minute. An example: Suppose you have a water pipe with a pressure of 1 bar, at the end of the pipe a valve is connected with a Kv value of 3. The pressure drop is then one bar because the valve is connected to the outside air, so the pressure relative to the atmospheric pressure is zero. The Kv value of three means that the liquid flow through the valve will be 3 cubic meters per hour.
It is also important to realize that the Kv value is defined for water and not for gases or other liquids. For gases and liquids, the Kv value can still be used but is calculated with a formula. Therefore you should always use the Kv calculator to calculate the correct value.
In general, the Kv value of a valve is also given in the product description or the technical datasheet. The Kv value is a better way to choose the right size valve than, for example, the pipe size or the diameter of the pass-through. The reason for this is that the Kv value can vary considerably per valve and that the final liquid or gas flow that has to pass through the valve is the decisive factor.
There are different formulas for liquids and gases. In the case of gas, it is always defined in so-called normal conditions. That is, at room temperature and atmospheric pressure. To make it easy for you, we have a Kv value calculation tool for both liquids and gases on tameson.com
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Tags:
#tameson #Kvvalue #Howtocalculatevalvesize
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