Page 1
DEMA ADJUSTAB LE SINGLE STAGE INJECTORS
1. PURPOSE:
To allow two chemical products to be injected either separately or together.
Because the dual metering knob (P/N 481-2) is made of PVC it can no t e xcee d
100 p si and as a res ult the B2V2 injector is usually mounted prior
pump. Chemical products should, therefore, be mild enough not to damage
any internal pump parts.
2. PARTS:
A. Injector
B. (2) Ceramic Weight.
C. (2) Plastic tubing 8' long with foot strainer.
3. INSTALLATION:
The injector may be installed in a horizontal or vertical position in the water
line with the arrow in the direction of flow. The solenoid valves, however, must always remain in a horizontal position. They c an ne ver
be mounted in such a way that one coil is lower than the injector (fighting gravity).
WITH DUAL SOLENOID VALVES
MODELS 203B2V2, 204B2V2, 206B2V2
INSTALLATION INSTRUCTIONS
to the
Drop the ends of the plastic tubing with their strainers into their fluid product containers. Cut the tubing to convenient length and slip
the open end over the injector fitting. Connect electricity to the solenoid coils, making certain that the supply voltage corre spo nd s to t hat
printed on the nameplate stamping.
4. OPERATION:
Warning: Use care when handling hazardous chemicals.
Caution: Do not exceed 100 psi pressure or 160 F water temperature.
See Fig. 1 for location of water bypass screw and fine metering adjustment screws. Turn on water supply valve. Turning the current
"on" opens the valves to fluid product. The injector may draw momentarily as the system is filling but normally will stop as the sy stem
builds up to full pressur e. To actuate injector, turn the bypass screw clockwise until product begins to be drawn from the container.
After the f luid reaches the injector, the f eed rate may be adjusted to the desired rate by turning the by pas s s cre w. Th e ma xi m um i nj ect io n
rates are shown in Table 2. For low injection rates, it is advisable to set the bypass screw for more injection than required; then turn the
fine metering screw clockwise to reduce injection to the desired rate.
Table 1 shows the operation range of the injector. If the injector will not draw with the bypass screw full in, then the w ate r f lo w is be lo w
the range of the injector. If the injector draws with the screw full out but pressure loss is excessive, then flow is above the range of the
injector. Table 3 shows the injection rates for models 203 B2V2, 204 B2V2, and 206 B2V2 using metering tips at various viscosities.
Table 4 shows the appropriate pipe size used for each injector.
Water Pressure
PSI BARS
10 .69 0.50 - 3.50 1.89 - 13.24 2.00 - 6.40 7.56 – 24.21 3.60 - 11.00 13.62 – 41.61
20 1.38 0.55 - 4.40 2.08 - 16.64 2.30 - 7.50 8.70 – 28.37 4.20 – 13.00 15.89 – 49.17
40 2.76 0.70 – 5.40 2.65 – 20.42 2.90 – 9.50 10.96 – 35.93 5.30 – 17.00 20.05 – 64.30
60 4.14 0.80 – 6.40 3.03 – 24.07 3.40 – 11.00 12.86 – 41.61 6.20 - 19.00 23.45 – 71.87
100 6. 90 1.00 - 8.00 3.78 - 30.26 4. 20 - 14.00 15.89 – 52.95 7.70 - 24.00 29.12 – 90.78
TABLE 1
Water Flow Operating Range - Gallons per minute/ Liters per minute
Model 203 B2V2 Model 204 B2V2 Model 206 B2V2
I-591 Pg. 1 of 4
Rev. D-029995 07/04
Page 2
DEMA ADJUSTAB LE SINGLE STAGE INJECTORS
WITH DUAL SOLENOID VALVES
MODELS 203B2V2, 204B2V2, 206B2V2
INSTALLATION INSTRUCTIONS
TABLE 2
Maximum Fl uid Injection (oz/min and ml/min)
Fluid Viscosity (cps)
1 20 591 40 1182 48 1419
75 8 236 8 236 9 266
200 4 118 4 118 4 118
Metering
Tip
Color
1 75 200 1 75 200 1 75 200
Tan 1.1 32 0.8 23 0.5 14 1.1 32 0.8 23 0.5 14 1.1 32 0.7 20 0.6 17
Orange 1.4 41 1.0 29 0.7 20 1.4 41 0.9 26 0.6 17 1.4 41 1.0 29 0.8 23
Turquoise 2.0 59 1.4 41 1.0 29 1.9 56 1.2 35 0.9 26 1.9 56 1.3 38 1.0 29
Pink 2.7 79 1.8 53 1.3 38 2.6 76 1.7 50 1.3 38 2.6 76 1.8 53 1.3 38
Clear 3.5 103 2.4 70 1.6 47 3.4 100 2.4 70 1.6 47 3.5 103 2.3 68 1.7 50
Brown 4.0 118 2.7 79 1.7 50 4.0 118 2.4 70 1.9 56 4.0 118 2.6 76 1.8 53
Red 4.9 144 3.3 97 2.0 59 4.9 144 2.9 85 2.2 65 5.0 147 3.1 91 2.0 59
White 6.0 177 3.9 115 2.3 68 6.0 177 3.4 100 2.4 70 6.2 183 3.7 109 2.4 70
Green 6.8 201 4.4 130 2.5 73 6.8 201 3.8 112 2.5 79 7.1 209 4.1 121 2.6 76
Blue 7.8 230 4.9 127 2.7 79 8.4 248 4.3 127 3.1 91 8.9 263 4.8 141 2.9 85
Yellow 10 304 5.9 174 2.9 85 13 387 5.2 153 3.4 100 13 399 5.9 174 3.2 94
Black 13 390 6.7 173 3.0 88 18 538 6.1 180 3.5 103 20 594 6.7 198 3.5 103
Purple 17 505 6.7 173 3.1 91 27 813 6.8 201 3.5 103 31 925 7.5 221 3.6 106
Gray 19 561 7.1 209 3.3 97 32 972 7.0 206 3.5 103 38 1132 8.0 236 3.8 112
No Tip 20 591 8 .0 236 3 .7 109 39 1176 7.9 233 3 .7 109 48 1422 9.2 272 4.4 130
203B2V2
Viscosity (cps)
All induction rates are based on a water inlet pressure of 40 psi/2.75 bars.
Model 203 B2V2 Model 204 B2V2 Model 206 B2V2
TABLE 3
Injection Rates (oz/min and ml/min)
204B2V2
Viscosity (cps)
206B2V2
Viscosity (cps)
TABLE 4
MODEL PIPE SIZE
203 B2V2 3/8 NPT
204 B2V2 1/2 NPT
206 B2V2 3/4 NPT
I-591 Pg. 2 of 4
Rev. D-029995 07/04
Page 3
DEMA ADJUSTAB LE SINGLE STAGE INJECTORS
5. SERVICING:
CAUTION: Turn off water supply and electricity before servicing.
The check valve parts are in the metering knob and can be cleaned by removing the four screws. The knob may be rotated if it is
more convenient to have the adjusting screws on another side of the injector. As with any injector, if spray jets become clogged or
downstream restriction increases in any manner, the injector will stop drawing fluid. If it is inconvenient to remove the restriction
immediately , the injector may be put back into operation by turning the water bypass screw further clock wi se; t his ad ju st s t he in je cto r
to the lower f low rate. The bypass screw should be reset once the restriction is removed.
CAUTION: When servicing, make sure that replacement parts have been installed according to drawing. Be certain
RETURNS: NO MERCHANDISE MAY BE RETURNE D FOR CREDIT WI T HO UT D EMA ’S W RI TT E N
WITH DUAL SOLENOID VALVES
MODELS 203B2V2, 204B2V2, 206B2V2
INSTALLATION INSTRUCTIONS
to check that check valve parts are in place.
PERMISSION. RE TURN MERCHANDISE AUTHORIZ ATION NUMBER REQUIRE D IN
ADVANCE OF RET URN.
WARRANTY: DEMA p roducts ar e warranted agai nst defective material and workmanship under normal use and
service for one year from the date of manufacture. This limited warranty does not apply to any product s
which have a normal life shorter than one year or failure and damage caused by chemicals, corrosion,
improper voltage supply, physical abuse, or misapplication. Rubber and synthetic rubber parts such as
“o”- rings , diap hragms, squeez e tub ing and gas kets are cons idered exp endable and ar e not covered
under warranty. This warranty is extended only to the original buyer of DEMA products. If products
are altered or repaired without prior approval of DEMA, this warranty will be void.
Defective units or par ts should b e retur ned to the factory with transportation pr epaid. If inspection
shows them to be defective, th ey will be repaired or replaced without charge, F.O.B. factory. DEMA
assumes no liability for damages. Return merchandise authorization number, to retu rn u ni ts f o r repa ir o r
replacement, must be granted in advance of return.
I-591 Pg. 3 of 4
Rev. D-029995 07/04
Page 4
ADJUSTABLE SINGLE-STAGE INJECTORS
M OD ELS: 203B2V2, 204B2V2and 206B 2V2
100-15-
100-24 (E.P. O-R IN G)
OR
100-24PS-V (V ITON
O-RING)
24-25 (E.P. O-RING ) OR
24-25V (VITON O-R IN G)
24-24P
24-23
24-34
24-33-2
41-14-1
41-13-15
41-9-1
41-9C-1
41-7-14
41-2-15 (VITON DIAPHRAGM)
41-2-14 (E.P. DIAPHRAGM)
24-36
(203B2V2)
24-40
(204B2V2)
24-38
(206B2V2)
24-25
(203B2V2)
23-11(E.P.) O R 23-11V (VITON)
(204B2V2)
25-29
(206B2V2)
24-35
(203B2V2)
24-39
(204B2V2)
24-37
(206B2V2)
25-29 (E.P. O-RING ) OR
25-29V (VITON O-R IN G)
PART N0. DESCRIPTION
23-11
23-11V O-RING (VITON)
24-11MP
24-23
24-24P
24-25
24-25V
24-33-2
24-3424-35
24-36
24-37
24-38
24-39
24-40
O-RI NG (E.P.)
FOOT STR AINER
CHECK VALVE SPRING
CHECK VALVE BALL
CHECK VALVE O-RING (E.P.)
CHECK VALVE O-RING (VITON)
SCREW #8- 32 X 1 3 /8 L G. (4-R E Q D.)
CHECK VALVE CORE (SPECIFY MODEL NO.)
BY-PASS SCREW
BY-PASS SCREW RETAINER
BY-PASS SCREW
BY-PASS SCREW RETAINER
BY-PASS SCREW
BY-PASS SCREW RETAINER
25-29
25-29V
41-14-1
41-2-14
41-2-15
41-7-14
41-9-1
41-9C-1
41-13-15
61-107-2
100-12
100-15K
100-24
100-24PS -V
24-11M P
61-107-2
100-12
DESCRIPTIONPART N0.
O-RING (E.P.)
O-RING (VITON)
TOP PLUG SCREW
PLUNGER ASSEMBLY (WITH E.P. DIAPHRAGM & SPRING)
PLUNGER ASSEMBLY (WITH VITON DIAPHRA GM & SPRING)
ENCLOSING TUBE ASSEMBLY
SOLENOID COIL (SPECIFY VOLTAGE) JUNCTION BOX AS SHOWN
SOLENOID COIL (SPECIFY VOLTAGE) CONDUIT CONNECTION
NAMEPLATE
CERAMIC WEIGHT
VINYL TUBING (3/8" O.D. X 8' LG)
MET ERING TIP K IT (14 PCS.)
METERING SCREW (-B INJECTORS) W/E.P. O-RING
METERING SCREW (-B INJECTORS) W/VITON O-RING
I-591 Pg. 4 of 4
Rev. D-029995 07/04
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