Referring to the illustrated pneumatically-operated diaphragm-actuated control valve, what statement is true? GS-0051

Correct Answer: Option D — The control valve has two discs which are both downward seating.

The illustrated valve utilizes a double-seated design where both discs are oriented to seat downward. This configuration is specifically engineered to achieve hydraulic balance, as the inlet pressure acts on the top of one disc and the bottom of the other, neutralizing the force of the inlet pressure.