DRAIN VALVES. Seven drain valves are located at the left front of ROWPU. They are used to draw
samples at various stages of purification and to drain water from unit before moving.
Figure 2-8. Drain Valves
CHEMICAL FEED PUMP VALVES. Valves have two positions: PRIME and RUN. PRIME is for priming
chemical feed pumps, and RUN for adding chemicals.
Figure 2-9. Chemical Feed Pump Valves