When the boiler cools down and its internal pressure drops, the vacuum valve opens to admit atmospheric air and prevent damage.

The engineer inspected the clack valves before restarting the steam pump.

The technicians closed the scum valves before starting maintenance on the settling tank.

Before starting the inspection, the engineer closed the scum valve to prevent oily surface deposits from entering the drain.

During the dissection, the professor pointed to Tulp's valve and explained its role in regulating the flow from the ileum to the cecum.

During the colonoscopy, the surgeon noted inflammation around Bauhin's valve, which was causing intermittent obstruction.

The surgeon carefully inspected the colic valve before proceeding with the resection.

During the diagnostic endoscopy, the physician noted inflammation near the Tulpius valve and scheduled a follow-up.

During the autopsy, the pathologist examined the ileocecal valves for signs of inflammation.

During the surgery, the surgeon inspected the ileocaecal valve for signs of inflammation.