Gu placed the old diagram beside the burned valve on the repair table. Soot had darkened the copper, but the fittings were still visible. Qiao Wen read the arrows on the copied sheet, then turned the failed valve to match them.
“The two feeds are reversed here,” he said. “The crew installed the fittings exactly as this copy shows.”
Gu studied the original sheet. “I approved the copy before it went to the crew.”
Eri stood at the end of the table. “You will write that in the report.”
“I will.”
Deyan took a fresh sheet and drew the junction. She placed the cutoff before the point where the two anchor feeds met. Beside it, she added an arrow showing the direction of flow. At the local barrier, she drew a second arrow showing how a failed node would isolate itself.
Qiao checked the metal fittings against the drawing. “The handle will close toward the barrier, and the upstream valve cuts both incoming feeds before they join. That is clear.”
“Can a village crew install it without guessing at the old symbol?” Eri asked.
