TM 5-4610-223-12 Table 2-1.  Valves and Draincocks Startup Normal Symbol Location Function Type and size Position Operating position CV-6 Raw water line Vents raw water line to Type A, 1/2 in. brass Closed Closed to slurry assist complete drain- draincock used as feeder. age vent. CV-7 Raw water line to Controls flow of raw 1/2 min gage valve. Open Partially limestone water used for di- open slurry feeder lutlon of limestone compartment slurry. CV-8 Raw water line Controls valve for fill- 1/2 in gate valve. Open Closed to slurry feeder ing limestone tank. tank. CV-9 Raw water line Main raw water in- 2 in. gate valve. Open Open to manifold fluent valve for fill- aspirator ing erdlator tank CV-10 Raw water in- Controls flow of raw 1 1/2 in gate valve. Open Open fluent line to water to aspirator. aspirator CV-11 Raw water in- Controls flow of raw 1 1/2 in gate valve Open Open fluent line to water to aspirator aspirator. BPV-12 Raw water level Controls raw water 1 1/2 in gate valve Closed Partially alarm piping rate of flow to Open erdlator tank. DC-13 Raw water level For draining of line Type A, 1/2 in. brass Closed Closed alarm piping draincock. CV-14 Coagulated water Permits drainage of 1 1/2 in. gate valve Closed Closed line from slurry sludge. take off weir box to sludge concentrator. CV-15 Coagulated water Supplies coagulated 1/2 in. angle valve. Closed Closed line from erd- water for mixing lator tank to chemicals. diatomite dilution box. CV-16 False bottom of Controls waste water Orifice plug valve (long Closed Open the sludge sludge draw off with- pull rod). concentrator out loss of clear tank water CV-17 In sludge con- Controls flow of Orifice plug valve Closed Partially centrator tank. coagulated water to (short threaded rod). open wet well. 2-2