TM 55-1930-209-14&P-1 Table 13-3.  ROWPU System Valves Label Identification Type Valves Location and Valve Function 3-in. RO1 ROWPU space - on MEDIA FILTER 1 FLOW; 3-way pretreatment skid allows seawater to flow ball valve ball valve to media filter 1 when making product water and when backflushing media filter 1 3-in. RO2 ROWPU space - on MEDIA FILTER 2 FLOW; 3-way pretreatment skid allows seawater to flow to ball valve media filter 2 when making product water and when backflushing media filter 2 3-in.   RO3 ROWPU space - on MEDIA FILTER 3 FLOW; 3-way pretreatment skid allows seawater to flow to ball valve media filter 3 when making product water and when backflushing media filter 3 3-in.   RO4 ROWPU space - on MEDIA FILTERS FLOW; 3-way retreatment skid allows seawater from media ball valve filters to flow to cartridge filter assembly and HP pump when making product water 2-in.   RO5 ROWPU space - on MEDIA FILTER BACKWASH; globe pretreatment skid allows waste water to flow diaphragm through R06 and RO12 directly valve overboard during media filter backflushing 3-in.   RO6 ROWPU space - on MEDIA FILTER BACKWASH 2-way pretreatment skid FLOW; allows adjusting media ball valve filter backflushing water flow to obtain optimum flow 2-in.   RO7 ROWPU space - in BRINE THROTTLE VALVE; 2-way brine discharge line adjusts brine flow rate throttling so that product water valve is 1/3 of seawater flow. Product water flow is controlled by adjusting valve RO7 and HP pump diesel engine speed 3/4-in.   RO8 ROWPU space - bottom CARTRIDGE FILTER DRAIN; 2-way of cartridge filter assembly for taking filtered seawater ball valve samples and draining cartridge filter assembly 3/4-in.   RO9 ROWPU space - on end PRODUCT WATER SAMPLING; 2-way of each pressure tube for sampling product water ball valve in RO block pressure tube 4-in.   RO10 Void 2 starboard - MEMBRANE CLEANING gate valve above seawater pump SOLUTION RECIRCULATION; allows membrane cleaning solution to recirculate through seawater pumps 13-21