| In the illustrated huddling-chamber safety valve, what statement is true concerning the opening and closing forces acting upon the disc? Illustration SG-0018 |
| A) The spring force acting upward on the disc is a valve opening force, and the sensed pressure acting downward on the disc is a valve closing force. |
| B) The spring force acting upward on the disc is a valve closing force, and the sensed pressure acting downward on the disc is a valve opening force. |
| C) The spring force acting downward on the disc is a valve opening force, and the sensed pressure acting upward on the disc is a valve closing force. |
| D) The spring force acting downward on the disc is a valve closing force, and the sensed pressure acting upward on the disc is a valve opening force. |
