TM 5-4610-223-12 Table 2-1.  Valves and Draincocks - Cont Startup Normal Symbol Location Function Type and size Position Operating position CV-36 Coagulated water Controls flow of 1 1/2 in., 3-way, plug Open Closed line from filter coagulated water for valve 2-port, 900 down down pump to in- filtering or washing. turn. fluent side of filter. CV-37 Coagulated water Diatomite slurry 3/4 in. gate valve. Open Closed line below pre- filling control valve coat funnel to filter. filter. CV-38 Air vent line on Filter air vent. 3/8 in. angle valve. Open Open influent side of filter. DC-39 Recirculation Drains recirculation 1/8 in. draincock. Closed Closed filter line below filtered water line. gate valve CV-40. CV-40 Recirculation- Starts and stops flow of 1 1/2 in. gate valve. Closed Open filter line be- water from filter. low flow con- troller valve CV-45 DC-41 Influent filter Cut off water pressure Type E, 1/4 in. brass Open pressure gage to influent gate. draincock. line. DC-42 Influent filter Drain filter influent Type A, 1/8 in. brass pressure gage gage and piping. draincock. line. DC-43 Effluent filter Cut off water pressure Type E, 1/4 in. brass Open Open pressure gage to effluent gage. draincock. line. DC-44 Effluent filter Drains filter effluent Type A, 1/8 in. brass Closed Closed pressure gage gage and piping. draincock. line. CV-45 Recirculation Controls rate of flow 1 1/2 In. flow Open and Open and filter line be- of water through controller valve regulate regulate low effluent plug valve CV-46. CV-46 Recirculation Controls direction of 1 1/2 in., 3 way, port, Open to R Open to F filter line flow for recircula- 90° turn, plug valve, (recircu- (filter) above flow tion or filtering. filter effluent. late) controller valve CV-45. 2-4