Pneumostat Chest Drain Valve

chest drain
A chest tube (chest drain or tube thoracostomy in British medicine or intercostal drain) is a flexible plastic tube that is inserted through the side of the chest into the pleural space.
Tube passed through the chest wall to drain off air leaking from the lung.
A catheter inserted into the chest to drain off fluid or air

valve
A membranous fold in a hollow organ or tubular structure, such as a blood vessel or the digestive tract, that maintains the flow of the contents in one direction by closing in response to any pressure from reverse flow
A device for controlling the passage of fluid through a pipe or duct, esp. an automatic device allowing movement in one direction only
control consisting of a mechanical device for controlling the flow of a fluid
a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it
device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone
A cylindrical mechanism in a brass instrument that, when depressed or turned, admits air into different sections of tubing and so extends the range of available notes