Section Ill. PRINCIPLES OF OPERATION
1-12. SCHEMATIC DESCRIPTION. The hypochlorination unit (see figure 1-3) provides for the addition of
hypochlorite solution to unchlorinated water using hydraulic pressure from the untreated water.
a. The range adjusting valve (1) diverts operating water from the 4-inch manifold (2) through the inlet shutoff
b. The operating water flows through the inlet shutoff cock to the flow controller (4). The operating water
flowing through the flow controller returns to the water supply through the outlet shutoff cock (5).
c. The flow controller converts the circular motion imparted by the operating water to a reciprocating action
for operation of the control pilot valve (6).
d. In charge position, the control pilot valve passes operating water to the solution feed pump (7). In
discharge position, the pilot valve exhaust operating water passed to the solution feed pump through the pilot
valve drain hose (8).
e. The operating water causes the solution feed pump to perform a discharge stroke emptying the liquid
head assembly (9). When the pilot valve changes to discharge position, the solution feed pump returns to the
ready position forcing the operating water to drain and producing a suction like stroke.
f. The discharge stroke of the solution feed pump expels the contents of the operating chamber of the liquid
head assembly (9) out the injection nozzle (10) into the manifold. The suction-like stroke causes the operating
chamber to fill with hypochlorite solution from the reservoir tank (11).
g. The pressure gage (12) provides constant monitoring of the water pressure.
h. The 1/4-inch globe valve and fill hose (13) permit replenishment of water in the reservoir tank with
unchlorinated operating water.