Nall’s little closing weight worked on the bench before it worked beside the vessel.
Hend lengthened the arm, changed its pivot, and used the measured hot valve force rather than the easy force of the cold stem. Neri gave the falling weight a guard broad enough to keep a dropped tool out of its path. The operator could still reach the reset without putting a wrist inside the closing movement.
On day1620, they installed the assembly.
The first trial used a cold isolated vessel. Cooling flow fell. The float dropped. The weight moved through its guard and closed the feed.
Nall reset it.
They tried again with the stem warm.
This time it stopped short.
Hend swore once, quietly, and asked everyone to leave it exactly where it had failed. A packing collar had tightened against the hot stem. The bench test had used the measured force, but it had not reproduced that sideways pull.
