6
IMPORTANT: THE ENTIRE CONTENTS OF THIS
MANUAL MUST BE READ AND UNDERSTOOD PRIOR
TO INSTALLATION, STARTUP, AND OPERATION OF
THIS EQUIPMENT. ALSO, DO NOT DISCARD THIS
I
NSTRUCTION MANUAL UPON COMPLETION OF
THE INSTALLATION AS THIS MANUAL CONTAINS
INFORMATION ESSENTIAL TO THE SAFE HANDLING,
OPERATION, AND MAINTENANCE OF THE EQUIPMENT.
R
EGAL Series 7000 SMARTVALVES are used to AUTOMATICALLY
regulate the feed rate of a REGAL gas dispensing system. The
Models (7009 and 7010) covered in this manual can be used
to feed either chlorine (CL
2
) or sulfur dioxide (SO
2
) gas. These
models may be configured to control a variety of automatic
systems including: A) Flow Proportional Control, B) Residual
Only Control, C) Compound Loop Control, D) Feed Forward
De-chlorination or E) Chloramination. A brief description of
each of these systems is included below.
MODEL 7009 is used for 10 PPD (200 gm/hr)
to 500 PPD (10 kg/hr) systems.
MODEL 7010 is used for 1000 PPD (20 kg/hr)
and 2000 PPD (40 kg/hr) systems.
A) FLOW PROPORTIONAL CONTROL
(See Drawing No. 1)
Flow Proportional Control is used in systems where the water
flow varies but the quality of the water remains the same. In
this control scheme, a water Flow Meter, located in the main
water line, continuously transmits a 4-20 milliamp signal to the
SMARTVALVE indicating variations in the water flow rate. The
SMARTVALVE then responds by automatically adjusting the
chemical feed rate in direct PROPORTION to the water flow.
B) RESIDUAL ONLY CONTROL
(See Drawing No. 2)
Residual Only Control is used in applications where the water
flow remains constant but the quality of the water varies. In this
Control Scheme, a chlorine residual analyzer, located down-
stream from the SMARTVALVE, transmits a 4-20 milliamp
signal indicating variations in the chlorine residual level. The
SMARTVALVE responds by automatically adjusting the
chlorine feed rate to maintain the desired residual level.
C) COMPOUND LOOP CONTROL
(See Drawing No. 3)
Compound Loop Control is a combination of both Flow
Proportional and Residual Only control schemes. It is used
when both the water flow rate AND water quality vary. In this
control scheme, both a water flow meter and a chlorine residual
analyzer are used to signal the SMARTVALVE to make any
necessary adjustment(s) to the gas feed rate. The initial signal
is transmitted from the upstream water flow meter to the
SMARTVALVE which responds by adjusting the gas feed rate
in proportion to the water flow rate. The secondary signal is
transmitted from the downstream residual analyzer to the
SMARTVALVE which responds by making further adjustment,
if necessary, to maintain the desired residual level.
D) FEED FORWARD DECHLORINATION
(
See Drawing No. 4)
In this control scheme, two SMARTVALVES are used; one to
feed chlorine to disinfect the water; and one to feed sulfur dioxide
to remove any remaining chlorine residual from the treated
water. The SMARTVALVE used for chlorination is located
upstream from the residual analyzer and the SMARTVALVE
used for de-chlorination is located downstream. An upstream
f
low meter sends a signal to both valves which regulate the
chemical feed rates in proportion to the water flow. The residual
analyzer signal is sent to the chlorination (upstream) valve to
make a more precise adjustment, if necessary, to maintain the
proper chlorine residual level. The dechlorination (downstream)
valve simultaneously receives the analyzer signal and then
adjusts the sulfur dioxide gas feed rate to reduce (or remove)
any remaining chlorine residual prior to discharge of the water.
E) CHLORAMINATION
(See Drawing No. 5)
Although the REGAL Model 7009/7010 SMARTVALVE does
not offer “CHLORAMINATION” as a specific, selectable Control
Scheme, the SMARTVALVE is still a commonly used component
in this type of system. Therefore, we have included a basic
guideline to provide a better understanding of the chloramination
process and the installation of this type of system.
The Chloramination water disinfection process is becoming a
more common application in large water treatment facilities
where distribution may cover several square miles, thus requiring
water flow through long distances of pipeline(s). Due to chlorine’s
aggressive, rapid reaction with both organics and non-organics,
it can sometimes be difficult to maintain a FREE chlorine
residual that lasts long enough to reach the point(s) of
distribution. In comparison, CHLORAMINES offer an alternative,
less aggressive disinfectant that reacts more slowly and
remains in the distribution system longer. Chloramines also
help reduce the formation of disinfection by-products such as
trihalomethanes (THM).
Chloramines are formed during a reaction between chlorine
(CL
2
) and ammonia (NH
3
) which creates a combined residual
that consists predominantly of monochloramine. A Chloramination
system is used to promote the formation of chloramines by
combining the use of a REGAL chlorine (CL
2
) gas feed system
and a REGAL ammonia (NH
3
) gas feed system. The fully
automatic system illustrated in this bulletin, requires the use of
two REGAL SMARTVALVES, one for ammonia and one for
chlorine. The chlorination SMARTVALVE adjusts its feed rate
based upon a signal(s) from either, or both, a water flow meter
and residual analyzer. The chlorine feed rate (output) signal is
then transmitted to the ammonia SMARTVALVE (Model
7001A) which simultaneously adjusts its feed rate proportional
to a preset ratio of ammonia to chlorine.
A) THE IMPORTANCE OF MIXING
Complete and rapid mixing of the chemical solution at the point
of application CANNOT BE OVERSTATED. Without proper
mixing, control will be erratic and unacceptable due mainly to
the chemical’s tendency to stratify (horizontally and vertically),
even around bends and sharp corners. A quick, thorough mix
will enhance the chemical contact time resulting in more
constant, stable residual readings.
2.0 DESIGN AND INSTALLATION
CONSIDERATIONS
1.0 INTRODUCTION
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