Question 572Steam Plants - Assistant Engineer70% to pass
Which of the following statements concerning the design of balanced throttle valves is correct?
AI Explanation
The correct answer is C) They commonly use a conventional valve disc and a balance piston.
Balanced throttle valves are designed to have a balanced force on the valve disc, which allows for easier operation and better control. The use of a conventional valve disc and a balance piston is a common design for balanced throttle valves, as it helps to counteract the forces acting on the valve disc and maintain a neutral position.
The other options are incorrect:
A) The ahead throttle valve does not normally utilize a guarding valve, as the balanced design already provides the necessary control.
B) Both ahead and astern valves typically have a positive opening tendency, not a balanced one.
D) Balanced throttle valves commonly use a single valve disc and a balance cylinder, not two parallel seats.
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