Which type of gate valves are used in high head installations?(a) Needle valves(b) Butterfly valves(c) Globe valve(d) Pinch valveThe question was asked by my college professor while I was bunking the class.The question is from Classification of Hydro-Plant in portion Hydro Electric Power Plant of Energy Engineering

Which type of gate valves are used in high head installations?(a) Need

1.	Which type of gate valves are used in high head installations?(a) Needle valves(b) Butterfly valves(c) Globe valve(d) Pinch valveThe question was asked by my college professor while I was bunking the class.The question is from Classification of Hydro-Plant in portion Hydro Electric Power Plant of Energy Engineering
Answer» RIGHT choice is (a) Needle valves The explanation is: Needle valves are used in high head installations. The needle VALVE consists of three water filled CHAMBERS A, B and C in which HYDRAULIC pressures can be varied. The valves are opened and closed by varying the pressures in these chambers.

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