TM 5-4610-218-12
Valves and Draincocks - Continued
Table 2-1.
Normal
Illus-
tration
Symbol
Startup
Operating
Location
Type and
Function
F i g . No.
Position
Position
Size
Closed
Closed
2 in.
Drains
Lower
DV-20
gate
erdlator
drain line
valve.
tank com-
from bot-
pletely.
tom of erd-
later tank
Partially
1 in.
Closed
Controls
Drain line
DV-21
open
gate
the amount
from sludge
valve.
of sludge
concentra-
drawoff,
tor tank.
drains
sludge
concentra-
tor tank.
Closed
Closed
1 in.
Drains
Drain line
DV-22
gate
sludge
from sludge
valve.
concentra-
concentra-
tor tank
tor tank.
completely.
2-7
