AirSep Onyx Instruction Manual page 18

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AirSep Corporation
Circuit Board
The circuit board controls the cycle time and sequence of each solenoid valve.
Valve Block
The valve block houses the feed and waste solenoid valves.
Equalization Valve
The equalization valve balances the pressure between the two sieve beds.
4-4 Onyx/Onyx+/Onyx Ultra Instruction Manual