How does the hanger yoke system ensure a gas-tight seal?

• A. By using a magnetic seal
• B. Via a "floating valve" mechanism
• C. Through a rubber gasket
• D. By locking the cylinder in place

Answer: (B)

The hanger yoke system ensures a gas-tight seal primarily through the use of a "floating valve" mechanism. When a gas cylinder is attached to the yoke, the floating valve is designed to move up and down as the cylinder is connected or disconnected. This movement enables the valve to seat properly against the orifice of the cylinder, creating a secure and airtight connection. This design effectively prevents any gas leakage, ensuring that the anesthetic gas delivered to the patient is both safe and consistent.

While other methods such as rubber gaskets do contribute to seals in different contexts, the unique function of the floating valve mechanism is specifically tailored to adapt and maintain a gas-tight connection within the context of the hanger yoke system. The "floating" aspect allows for adjustments that compensate for any misalignment between the cylinder and the yoke, further enhancing the integrity of the seal. This is vital for safe and effective operation of the anesthesia machine.