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What is the formula of speed control valve during retraction of a flow control valve?

What is the formula of speed control valve during retraction of a flow control valve? Correct Answer V=Q/(A-a)

The formula of speed control valve during retraction of a flow control valve is V=Q/(A-a), where ‘Q’ is the rate of flow of the working fluid and A is the area of the Piston. V is the speed of the actuator and ‘a’ is the area of the piston rod.

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