TM 55-1930-209-14&P-2 Table 3-2.  Seawater System Valves Figure 1-3 Label Identification Type Callout Location and Valve Function 6-in gate valve SW1 Void 2 starboard - In SEAWATER TO STRAINER 1: seawater supply line Allows flow from seachest between seachest and to seawater strainer and seawater strainer isolates seachest from strainer 6-in gate valve SW2 Void 2 starboard - In SEAWATER TO STRAINER 2: seawater supply line Allows flow from seachest between seachest and to seawater strainer and strainer 2 isolates seachest from strainer 1 1/2-in gate valve SW3 Void 2 port - In SEAWATER TO STRAINER seawater supply line 3: Allows flow from between seachest and seachest to strainer cooling water strainer and isolates seachest from strainer 6-in gate valve SW4 Void 2 starboard - In STARBOARD SEAWATER seawater supply line SUPPLY TO STRAINERS:- from starboard shell Allows seawater to be supplied from starboard shell to seawater strainers 6-in gate valve SW5 Void 2 starboard - In STRAINER 1 INPUT: Allows seawater supply line seawater to be supplied from starboard shell from starboard shell and isolates strainer 1 6-in gate valve SW6 Void 2 starboard - In STRAINER 2 INPUT: Allows seawater supply line seawater to be supplied from starboard shell from starboard shell and isolates strainer 2 4-in gate valve SW7 Void 2 starboard - In BALLAST DRAIN TO ballast tank drain line STRAINER 1: Allows sea- on suction side of sea- water to drain from tank water pump 1 to seawater pump 1 and isolates ballast tank 4-in gate valve SW8 Void 2 starboard - In BALLAST DRAIN TO ballast tank drain STRAINER 2: Allows sea- line on suction side water to drain from tank of seawater pump 2 to seawater pump 2 and isolates ballast tank 6-in gate valve SW9 Void 2 starboard - In STRAINER 1 TO SEAWATER seawater pump 1 supply PUMP: Allows seawater line being obtained from seachest or starboard shell seawater supply to flow to seawater pump 1 and isolates seawater strainer from pump 1 6-in gate valve SW10 Void 2 starboard - In STRAINER 2 TO SEAWATER seawater pump 2 supply PUMP: Allows seawater line being obtained from seachest or starboard shell seawater supply to flow to seawater pump 2 and isolates seawater strainer from pump 2 3-6