TM 55-1930-209-14&P-4 Table 3-2.  Chlorination System Valves (Continued) Figures 1-2 & 1-3 Label Identification Type Callout Location and Valve Function 2-way CU8* In chlorination unit manifold vent CHLORINATION AIR VENT: Allows venting line of chlorination unit during normal operation and descaling and flushing 2-way CU9* In chlorination unit drain line to CHLORINATION DRAIN: Allows draining to sump sump from chlorination unit, circulating pump, acid tank, and holding tank 2-way CU10* In chlorination unit holding tank CHLORINATION HOLDING TANK supply line to metering pump CHLORINE FLOW: Allows chlorinated water to flow to metering pump from holding tank and isolates tank 3-way CU11* In makeup water line on CHLORINATION INPUT WATER discharge side of pressure set CONTROL: Allows either sea water from cooling pump or drinking water from pressure set to flow to holding tank 2-way CU12 In drinking water line from CHLORINATION DRINKING WATER pressure set in void 2 port near INPUT: Isolates drinking water supply valve CU11 from chlorination system until hose is connected between valves CU12 and CU12A 2-way CU12A In drinking water line from CHLORINATION DRINKING WATER pressure set in void 2 port above INPUT: Allows valve drinking water to flow valve CU12 pressure set to chlorination unit when hose is connected between valves CU12 and CU12A 2-way CU13 In chlorination unit holding tank CHLORINATION SYSTEM METERING supply line to metering pump PUMP INPUT: Allows chlorinated water to flow to metering pump from holding tank and isolates metering pump 2-way ball CU14 In metering pump discharge line CHLORINATION SYSTEM METERING (There are between pump and mixer PUMP OUTPUT: Allows measured amounts two valves of chlorinated water to flow into ROWPU CU14 on product waterstream Barge 1 ) 2-way CU15* In metering pump discharge line CHLORINATION SYSTEM CHLORINE (Barge 1) between two valves labeled FLOW TO DRINKING WATER: Allows CU14 chlorinated water to flow from metering pump to mixer 2-way CU15* In line connected to valve CU1 CHLORINATION DRAIN CONTROL: Allows (Barges 2 to cell drain line and circulating drain of chlorine from valve CU1 to sump and 3) pump drain line tank 2-way globe  CU16 Void 2 port overboard CHLORINATION SUMP TO OVERBOARD: discharge Allows sump tank to discharge overboard 2-way ball CU17 In the discharge line from CHLORINATION ACID TANK DRAIN: acid tank Allows drain of acid tank to sump *Indicates valve is part of chlorination unit 3-4