127. In the illustrated huddling-chamber safety valve, what statement is true concerning the opening and closing forces acting upon the disc

127. In the illustrated huddling-chamber safety valve, what statement is true concerning the opening and closing forces acting upon the disc

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.
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.
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.
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.

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