Yes, with caveats. Butterfly valves can throttle clean liquids/air well when properly sized and actuated (prefer high-performance double/triple-offset with a positioner). Aim to control in the ~20–80% open band; avoid <15–20% open to prevent seat erosion and poor stability. They’re not ideal for high ΔP, cavitation-prone, slurry/dirty services, or very precise low-flow control, use a globe (or characterized ball) valve there.
No, butterfly valve cannot be used for flow control, throttling or modulating. Butterfly valve belongs to the rotational type of valves which are used for on/off application. The flow profile passing through the butterfly valve shows that over the angle of 45% opening of valve, causes uncontrolled condition of flow, whereas the expected percentages is 63.23% for satisfactory flow control. Besides, butterfly valve has a big torque value at opening and this is also makes it impossible for the use of butterfly valve for throttling
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