TM 5-4610-223-12 Table 2-1.  Valves and Draincocks - Cont Startup Normal Symbol Location Function Type and size Position Operating position CV-47 Recirculation Prevents backward 1 1/2 in. swing check Closed Open filter line above flow of coagulated valve. effluent plug water into filter. valve CV-46. DV-49 Drain line from Drains waste from 1 in. quick acting gage Closed Closed bottom of filter valve. filter. ARV-5C Top of filter Releases air trapped in Air release. Closed Closed dome of filter and filter elements. CV-51 Filter water Controls flow of 1 1/2 in. gate valve. Open Open effluent. filtered water to storage tanks. DC-52 Recirculation To facilitate complete Type A, 1/2 in. brass Closed Closed line from filter drainage of recircu- draincock. to erdlator wet lation line. well. DC-53 Bottom of flange Drain water from area 1/4 in. brass Closed Closed on the flow between valve and draincock. controller diaphragm and (CV-45). flange. DC-54 Top of flange on Permit drainage of 1/4 in. brass Closed Closed the flow con- water from area draincock. troller (CV-45) between valve diaphragm and flange. 2-5