3030226 Rev. D 4-4 Screen Operation And Specifications
4.2.1 Solenoid Valves
Solenoids located inside the Millenium HX at various locations are used to direct fluid
flow during the different operations steps during the operation of the RO.
SV1 - Inlet water solenoid. It is used to control the RO feed water flow into the
RO.
SV2 - Located on the waste side of the membrane. During normal operation,
this valve remains closed. During the heat disinfection and chemical
processes, this valve opens to maintain the system at the required
pressure during the process. In addition, it is open during the start and
stop flushes. This valve also has an orifice hole to allow controlled flow of
water through when valve is closed.
SV3 - Product Divert Solenoid. During system startup, this valve will remain
closed during the startup flush time and will not open until the RO is
producing product water below the water quality set point. During the
heat disinfection and chemical modes, this valve cycles to direct fluid
throughout the system to ensure a proper disinfection/cleaning.
SV4 - Pump Isolation Solenoid. Controls the pump’s source of feed water. The
feed source will be from the internal tank or from the RO feed.
SV5 - Product Water Return Solenoid Valve. This valve provides backpressure
during normal operation of the RO allowing it to supply product water at a
pressure of approximately 30 PSI. During heat and chemical modes, this
valve is open allowing full flow for proper operation.
4.2.2 Check Valves
CK1 - Located on the waste side of the membrane and prevents the backflow of
fluid into the membrane.
CK2 - Located on the drain line and prevents the backflow of drain fluid into the
system.
CK3 - Located between the RO feed line and the drain line. It allows fluid from
the waste line to be used to feed the pump during low pressure
operations.
CK4 - Located in the product water line prior to the RO’s internal tank and
prevents backflow of the tank water into the product water.
CK5 - Located in the tank outlet to the pump and prevents RO feed water from
being fed into the internal tank.
CK6 - Located on the tank drain and prevents the tank from over pressurizing.
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