An ice plug is set on top of the ball valve to protect it, the cans atop the ice plug.
From the en.wikipedia.org
The released air travels through tubing to a ball-valve connected to the foot pedal and throttle.
From the sciencedaily.com
The cause was a particular type of ball valve and the problem disappeared when the valves were removed.
From the sciencedaily.com
If you see color in the bowl, it's probably a worn plunger ball or flapper valve.
From the tennessean.com
At the bottom of the TDU is a large ball valve.
From the en.wikipedia.org
A ball valve uses a spherical ball instead.
From the en.wikipedia.org
The TDU is also flushed with seawater to ensure it is completely empty and the ball valve is clear before shutting the valve.
From the en.wikipedia.org
The top breech door is shut, and the TDU is flooded and equalized with sea pressure, the ball valve is opened and the cans fall out assisted by scrap iron weights in the cans.
From the en.wikipedia.org
A valve ball is also used for severe duty, high-pressure, high-tolerance applications.