3
Control Valve Functions and Operation Cycles
This glass-filled Noryl
®
fully automatic control valve is designed as
the primary control center to direct and regulate all cycles of a water
softener. The control valve can be set to regenerate on demand
(consumption of a predetermined amount of water) and/or as a time
clock (passage of a particular number of days).
The control valve is compatible with a variety of regenerants and
resin cleaners. The control valve is capable of routing the flow of
water in the necessary paths to regenerate or backwash water
treatment systems. The injector regulates the flow of brine or
other regenerants. The control valve regulates the flow rates for
backwashing, rinsing, and the replenishing of treated water into
a regenerant tank.
The control valve is designed to deliver high service (27 gpm at
15 psig) and backwash (27 gpm at 25 psig) flow rates when the
bypass has straight fittings. The control valve uses no traditional
fasteners such as screws; instead, clips, threaded caps and nuts,
and snap type latches are used. Caps and nuts only need to be
firmly hand tightened because radial seals are used. Tools required
to service the valve include one small blade screwdriver, one large
blade screwdriver, pliers, and a pair of hands. A plastic wrench is
available which eliminates the need for screwdrivers and pliers.
Disassembly for servicing takes much less time than comparable
products currently on the market.
The transformer power pack comes with a 15-foot power cord and
is designed for use with the control valve. The transformer power
pack is for dry location use only. The control valve remembers all
settings for 2 hours if the power goes out. After 2 hours the only
item that needs to be reset is the time of day; all other values are
permanently stored in the nonvolatile memory. The control valve
does not need batteries.
When the control valve is used as a down flow softener, two
backwashes always occur. The softener starts regenerant prefill
before regeneration; the prefill starts 2 hours before the regeneration
time set. During the 2-hour period in which the brine is being made,
treated (softened) water is still available. For example: regeneration
time means 2:00 a.m., prefill option selected, downflow softener. Fill
occurs at 12:00 a.m.; start of backwash cycle occurs at 2:00 a.m.
The softener adjusts the backwash and rinse cycles automatically
increase with increasing salt dosage. Backwashes can be set
to NORMAL or LONGER. The option selected applies to all
backwashes.
Regeneration Steps and Purpose
Brine fill –
Brine tank is filled to dissolve salt for next regeneration.
Backwash –
Flow through the resin bed is reversed. Water flows
upward, expanding, and agitating the resin bed.
Brine in –
Brine is educted from the brine tank and passes
through the resin bed in a downward flow, thus removing calcium
and magnesium that has accumulated on the resin beads, and is
subsequently flushed to drain.
Backwash –
A second backwash is performed.
Rinse –
The resin is now flushed downward at a set flow rate. This
resettles the bed and rinses out any remaining brine left in the resin
bed.
Service –
Softener goes back into service and is ready to soften
water.
Exchange Capacity Data
20,000 grain approx. per cubic feet
6 pounds salt-sodium chloride
25,000 grain approx. per cubic feet
8 pounds salt-sodium chloride
30,000 grain approx. per cubic feet
15 pounds salt-sodium chloride
To convert parts per million (PPM) or milligrams per liter (mpl) to
grains divide by 17.1.
Example:
Water hardness of 250 PPM
(250 PPM divided by 17.1 PPM/gr) equals 14.6 gr
It is recommended that a good grade of solar or pellet salt be used.
One gallon of water dissolves approximately 3.0 pounds of salt.
One gallon of saturated brine weighs 10.74 pounds.
Noryl is a registered trademark of SHPP Global Technologies B.V.
