Which type of valves is preferred for moderate heads?(a) Butterfly valve(b) Tube valve(c) Needle vale(d) Globe valveI got this question by my college professor while I was bunking the class.Origin of the question is Classification of Hydro-Plant in portion Hydro Electric Power Plant of Energy Engineering

Which type of valves is preferred for moderate heads?(a) Butterfly val

1.	Which type of valves is preferred for moderate heads?(a) Butterfly valve(b) Tube valve(c) Needle vale(d) Globe valveI got this question by my college professor while I was bunking the class.Origin of the question is Classification of Hydro-Plant in portion Hydro Electric Power Plant of Energy Engineering
Answer» Right choice is (a) Butterfly valve To ELABORATE: For moderate HEADS butterfly VALVES are preferred. Gate valves are used to regulate the flow. This valve is used both as intake gate and as turbine valve. It helps INSPECTION without dewatering the penstock line.

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