Question: Pressure relief control valve and flow control valve
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What is the difference between a pressure reducing valve and a flow control valve? What are the working principles of these two types of valves? Are the flow rate, pressure, and temperature the same after adjustment?
The essence is the same. When selecting a control valve, the following process parameters need to be provided: maximum flow rate, normal flow rate, minimum flow rate ； Pressure before and after the valve.
In other words, does the flow control valve also have a pressure-reducing function? :)
Of course, how can a control valve regulate flow without a pressure difference?
Pressure reducing control valves pay more attention to pressure characteristics; therefore, in terms of valve design, a quick-opening type is generally used for throttling, as determined by the pressure reduction ratio. Flow control valves pay more attention to flow characteristics, generally adopting equal percentage characteristic or linear characteristic; equal percentage characteristic is more commonly used for process flow control, while linear characteristic is more often used for level control.
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