| In the illustrated pneumatically-operated diaphragm-actuated control valve, what statement is true concerning the opening and closing forces acting upon the control diaphragm? GS-0051 |
| A) The spring force acting on the control diaphragm is a valve opening force, and the pilot pressure acting on the bottom of the control diaphragm is a valve closing force. |
| B) The spring force acting on the control diaphragm is a valve closing force, and the pilot pressure acting on the top of the control diaphragm is a valve opening force. |
| C) The spring force acting on the control diaphragm is a valve opening force, and the pilot pressure acting on the top of the control diaphragm is a valve closing force. |
| D) The spring force acting on the control diaphragm is a valve closing force, and the pilot pressure acting on the bottom of the control diaphragm is a valve opening force. |
