3
51
9FG
0
1A
DD
X
VAL
VE CLAPPER IN “OPEN”
, “CL
OSED”
AND “LA
TCHED” POSITIONS
REAR
VIEW
OF MODEL
DD
X
VAL
VE
TO S
YS
TEM
CLAPPER IN “OPEN”
POSITION
CLAPPER IN “LA
TCHED”
POSITION
CLAPPER IN “CL
OSED”
POSITION
ALARM POR
T
TES
T POR
T
DRAIN POR
T
FROM SUPPL
Y
LEVER
PUSH ROD
PUSH ROD
CHAMBER
OUTLET
PUSH ROD
CHAMBER
INLET
RES
TRIC
TION
DD
X EXTERNAL
RESET
KNOB
PUSH ROD
CHAMBER
EXTERNAL
RESET
KNOB
PUSH INW
AD
AND RO
TA
TE KNOB CL
OCK
WISE
TO RESET
CLAPPER.
DO SO ONL
Y WHEN PUSH ROD CHAMBER IS
VENTED
.
Fig.
1