What mechanism inside the hanger yoke responds to pressure to open and close?

• A. Diffuser
• B. Floating valve
• C. Pressure relief valve
• D. Flow restrictor

Answer: (B)

The mechanism inside the hanger yoke that responds to pressure to open and close is the floating valve. This component is designed to allow or restrict the flow of medical gases based on the pressure applied. When a medical gas cylinder is connected to the yoke, the pressure from the gas forces the valve to open, allowing gas to flow to the anesthesia machine. Conversely, if the gas pressure is too low or the cylinder is removed, the valve closes to prevent backflow or contamination.

The floating valve is crucial for ensuring that the anesthesia machine receives a consistent and safe supply of gas, adapting in real-time to changes in pressure from the connected gas cylinder. This responsiveness is essential in maintaining patient safety during anesthesia delivery. The other components mentioned do not function in the same manner as the floating valve to specifically manage gas flow based on pressure changes.