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Table 1: Functions of flow control devices compared
Flow control device	Isolation	Manual flow regulation	Automatic flow regulation	Pressure regulation	Flow measurement	System self balancing
Pressure independent flow control valve	Yes	Yes	Yes	Yes	Yes	Yes
Isolating Valve	Yes	No	No	No	No	No
Regulating valve	Yes	Yes	No	No	No	No
Double regulating	Yes	Yes	No	No	No	No
Venturi-nozzle	No	No	No	No	Yes	No
Fixed-orifice fitting	No	No	No	No	Yes	No
Fixed-orifice/double regulating coupled	Yes	Yes	No	No	Yes	No
Constant flow controller	No	No	Yes	No	No	No
Variable-orifice valve	Yes	Yes	No	No	Yes	No
Differential-Pressure control valve	No	No	Yes	Yes	No	No
Auto flow controller	No	No	Yes	No	No	No