I was wondering if you could explain the meaning of the term Kv value in relation to valves, and how it is defined. Maybe you can explain with the aid of a simple example why this term so important?
It is useful to be able to compare valve capacities to suit a task, and in order to do this, the term Kv is used. The amount of fluid passing through a valve depends on the size of the valve orifice and the pressure drop across it. Kv simply indicates the capacity of a valve, and is defined as the quantity of water at 20 degrees C that it will pass in m/h with a 1 bar pressure drop. In this way, any two valves with the same Kv will pass the same amount of water with the same pressure drop. The full open capacity of a selected valve is denoted by the term Kvs, whilst Kvr is used to denote the actual requirement of the application. For instance, a water system may require a valve to give a Kvr of 14 to satisfy the full load condition. A valve with Kvs of 17 would be suitable, whereas a valve with a Kvs of 10 would not be able to give the required flowrate at the required pressure drop. With compressible fluids, such as steam, the valve Kvs is calculated in exactly the same way, but the v
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