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2.3.5.5 APL Valve Assembly
The APL valve assembly is an adjustable pressure limit valve for setting the maximum limited
pressure during manual ventilation of the anesthesia machine. The valve has a mechanical
structure. When adjusting the pressure, it changes the compression rate of the internal spring to
change the force of the pressure actuating device and act on the sealing valve. The structural
diagram of the APL valve assembly is shown below.
Figure 31 Structural diagram of the APL valve assembly
2.3.5.6 Absorber Canister and Bypass Assemblies
The absorber canister is used to hold the absorbent (such as sodalime). The absorbent absorbs the
CO2 exhaled by the patient during surgery, allowing the gas to circulate. When the absorber
canister is removed, the valve in the bypass assembly switches, to keep the breathing system in
the airtight state and allowing the mechanical ventilation of the anesthesia machine to continue.
The bypass assembly is mounted to the circuit adapter assembly through a hook structure. The
absorber canister assembly is assembled and disassembled by using a poppet device, which is
equipped with a position switch to detect whether the absorber canister is in place.
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