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2.3.2.2 Cylinder Yoke Assembly
The cylinder yoke assembly is used to connect a high-pressure cylinder to the anesthesia machine,
so that the anesthesia machine can use O2, air, and N2O supplied by the high-pressure cylinder.
The high-pressure cylinder is connected to the cylinder yoke by means of pin-indexed yoke
connection, which is sealed by the end face of a nylon pad and tightened by using a pentagon
knob. High-pressure gas in the cylinder is purified through the filter in the cylinder yoke and then
enters the pressure reducing valve. Low-pressure gas flows into the gas inlet assembly through
the check valve. The high pressure gauge and the cylinder yoke assembly are connected through
a high-pressure-resistant copper tube and a corresponding connector to monitor the pressure of
the gas output from the cylinder. In a cylinder yoke equipped with a high pressure gauge and an
electronic pressure sensor, the high pressure gauge displays the gas pressure, and the electronic
pressure sensor also displays the detected pressure on the display. The following figure shows the
pneumatic diagram (O2) of the cylinder yoke assembly:
Figure 6 Pneumatic diagram of the cylinder yoke assembly
The cylinder yoke assembly consists of four components: pressure reducing valve (1.8), high
pressure gauge (1.6), electronic pressure sensor (1.7), and check valve (1.9). For a cylinder yoke
equipped with only a mechanical pressure gauge but no electronic pressure sensor, a plug with
the same threads is provided in the position of the connector. The structural diagram of the
cylinder yoke assembly is shown below.
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