Iron Curtain ® Flow Diagrams - Hellenbrand Iron Curtain 2.0 Owner's Manual

Solenoid
Valve
Timer
Aeration Tank
Solenoid
Valve
Timer
Aeration Tank
U.S. Patents #7,156,995 B2
7,491,321 & 7,638,063
17
IRON CURTAIN
Shuttle
Valve
Step 2.
Aeration Operation Air Recharge Cycle
When energized, the air pump sends air through the solenoid valve into one end of the shuttle valve.
Once air pressure in the shuttle valve is greater than the water supply pressure at the other end of the
shuttle valve, the piston shifts to the open position. In the open position, the bleed-off port discharges
Shuttle
excess water and old air to the drain port through a flow restrictor. Simultaneously, the air inlet port
Valve
opens to provide a direct connection between the air pump and the top of the aeration tank. The air
pump runs for a preset period of time recharging the head of air in the aeration tank.
Air Recharge Shut Off
The programming in conjunction with a relay turns power off to the air pump and the solenoid valve
at the end of the recharge cycle. The solenoid valve then closes the port between the air pump and
the shuttle valve. The port between the shuttle valve and the atmosphere opens and releases air
pressure. This allows water pressure to shift the piston to the closed position. With the piston in the
closed position, the air recharge inlet port is closed and direct communication between the bleed
off tube and the drain port is also closed.
Relay Operation
How often the air recharge cycle occurs is based on the number of gallons that pass the meter. The
timer simultaneously energizes the air pump and the solenoid valve. After a factory set amount of
time, the relay shuts off the air pump and de-energizes the solenoid valve. Both the frequency and
duration can be modified based on application parameters.
Solenoid Valve Operation
The solenoid valve is a three-way valve having ports that connect to the air pump, shuttle valve and
the atmosphere. In the service cycle, the solenoid valve is de-energized and closes the port to the
air pump, providing a positive shut-off to the pump. This prevents water from backing up into the
air pump and damaging the pump. In the air recharge cycle, the solenoid valve closes the port to
the atmosphere and opens the port from the air pump.
Shuttle Valve Operation
In the service position, water pressure holds the shuttle valve piston in the closed position, trap-
ping the airhead in the aeration tank and closes the air recharge inlet port and drain port. During air
recharge cycle, air pressure is greater than the water pressure and forces the shuttle valve piston in
the open piston. The shuttle valve has an internal pressure relief valve that relieves high pressure
that may build up in the aeration tank. This precautionary function protects components from failure
due to excessive pressure.
FLOW DIAGRAMS
®
Step 1.
Aeration Operation Service Cycle
In the service cycle, raw water enters the inlet
port of the aeration tank and is directed through
the inlet diffuser. The oxidation process begins
when the water passes through the inlet diffuser
and cascades through a head of air. This air/
water contact oxidizes the iron, manganese,
hydrogen sulfide in the water. The water is
directed toward the bottom of the tank and
travels through the pick-up tube. It then passes
through the outlet of the aeration tank to the
inlet of the filter tank.
Filter Tank Operation Service Cycle
Raw water enters the filter tank through the inlet
port of the filter control valve. Upon system
demand for filtered water, water is directed to
the top of the tank and flows downward through
the multimedia filter bed toward the lower
distributor. Oxidized iron particles are trapped
by the filter bed as the water passes through.
Filtered water enters the lower distributor and
travels up the distributor tube to the outlet port
on the filter valve.
U.S. Patents #7,156,995 B2
7,491,321 & 7,638,063