IM 25.055AC UA (C/6-01)
AUTOMATIC CHLORINATOR - 3000LB/24HR
24
notch variable orifice. Thus the flow through the orifice is entirely a func-
tion of the size of the orifice as determined by the position of the V-notch
plug as set by a positioner in response to an external electric signal.
Gas under pressure enters the vacuum regulator. From the vacuum regu-
lator, the gas, under a controlled vacuum, passes to the control module
through connecting pipes and then through a rotameter (feed rate indica-
tor) causing the float to indicate the rate of flow on an easily read scale. As
stated above, the rate of flow is controlled by the position of the V-notch
variable orifice across which a constant differential at less than atmo-
spheric pressure is maintained by the operation of the differential regulat-
ing valve. From the differential regulating valve, gas passes to the injector
where it is mixed with water. The resultant solution is discharged to the
point of application.
3.3.1 2" Injector Manual Operation (See Dwg. 25.100.181.011)
• Application Against Pressure
When the three-way valve is in the ON position, water flows from the
injector inlet through a strainer (A) and the three-way valve (B) to the
chamber (C). Pressure in the chamber (C) overcomes the force of the
spring (D) and opens the plug (E) the distance determined by the
setting on the adjuster screw (F), permitting water to flow through the
injector. The flow of water through the injector creates a vacuum,
which pulls the diaphragm (G), which opens the seat (H) and permits
gas to be drawn from the gas feeder.
When the three-way valve is turned to the OFF position, pressure in the
chamber (C) is relieved and a spurt of water passes through the OFF
port in the three-way valve to waste. The spring (D) closes the plug (E)
and, with no water flowing through the injector to create a vacuum, the
spring (J) closes the seat (H) to prevent water on the injector discharge
from backing up into the gas feeder.
• Application Against Negative Head
If the injector described above was used where a negative head existed
at the injector discharge, when the injector was shut down, this suction
might act on the diaphragm (G) with sufficient force that the spring (J)
could not close the seat (H), with the result that gas would be drawn
from the gas feeder.
To prevent this, an injector suction shut-off unit is added to the injec-
tor. When the three-way valve is in the OFF position, this unit, by the
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