True or False: The check valve assembly of the hanger yoke system acts as a permanent seal for empty yokes.

• A. True
• B. False
• C. Only when under pressure
• D. Only when a new cylinder is installed

Answer: (B)

The check valve assembly of the hanger yoke system is designed to allow gas from a full cylinder to flow into the anesthesia machine while preventing backflow from an empty cylinder. However, it does not act as a permanent seal for the empty yoke; instead, it allows some air exchange when the pressure in the yoke drops. The check valve is a safety feature that minimizes the risk of contamination and ensures that when new cylinders are connected, they can provide gas without interference from the empty cylinder. This means that when an empty yoke is present, the check valve does not create an airtight seal, allowing for the possibility of atmospheric gases entering the yoke.

Thus, the assertion that the check valve acts as a permanent seal for empty yokes is incorrect, making the answer true. The check valve only functions effectively under certain conditions and does not provide a permanent seal, aligning with the rationale behind the correct choice.