Mindray WATO EX-55, Service Manual

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2-11
System Switch Assembly
The above picture shows the system switch assembly. Supply gases of Air and O2 go into
system switch 22; and Air & O2 flowing into the flowmeter assembly and O2 into the control
end of the O2-N2O cut-off valve are outputted. System switch has an electrical outlet which
controls the power-on status of the system. When the system switch is turned on, O2 and Air
enter the anesthetic gas delivery system and the system is powered on simultaneously. The
anesthetic ventilator starts to monitor the status of the system. When the system switch is
turned off, O2 and Air cannot enter the anesthetic gas delivery system and the system is
powered off.
O2-N2O Cut-off Valve Assembly
The above picture shows the O2-N2O cut-off valve assembly. O2-N2O cut-off valve 25 is a
pneumatically controlled three-way valve. O2 is uploaded to the control end of the O2-N2O
cut-off valve to conduct on-off control of N2O. When the O2 supply pressure is less than 0.1
MPa (approximate value), N2O supply is cut off. When the O2 supplyp pressure is greater
than 0.1 MPa (approximate value), N2O supply is switched on. O2-N2O cut-off valve 25
does not affect Air supply.