In the hanger yoke mechanism, which direction does the plunger move when the cylinder pressure is greater than the pressure on the machine side?

• A. Right
• B. Left
• C. Up
• D. Down

Answer: (A)

In the hanger yoke mechanism of an anesthesia machine, the plunger operates based on the pressure differential between the gas cylinder and the machine side. When the pressure within the cylinder exceeds the pressure on the machine side, the higher pressure inside the cylinder pushes against the plunger. This pressure differential causes the plunger to move in the direction that facilitates the flow of gas from the cylinder into the machine.

In this case, when the cylinder pressure is higher, the plunger moves to the right. This motion allows the valve to open and thus enables the pressurized gas to be delivered to the anesthesia machine for use. Understanding the mechanics of the hanger yoke is crucial in ensuring that the anesthesia machine functions properly and safely, as it plays a critical role in the gas supply from the cylinder to the machine.