User:Rahulmishranb

Its regarding flow rate change fom a control valve. Why? If a flow orifice is installed in a line, it does not cause a change in flow rate, rather its potential energy remains constant and loss of pressure head is equally converted in increase in velocity head. but same does not happen with a control valve, it is also obstructing the flow of fluid, but flow rate changes. why does a control valve not behave like an orifice? why it causes a change in flow rate?