Reliable DDX - Preaction System Types and Operation; Dry Pilot Line Preaction Systems; Listings and Approvals; Wet Pilot Line System Operation

1C_COMMDDX_1
TO RESET: PUSH INWARD AND ROTATE KNOB CLOCKWISE (AS VIEWED FROM REAR)
EXTERNAL
RESET KNOB
PUSH ROD
CHAMBER
DRAIN PORT
TEST PORT
ALARM PORT
OUTLET
EXTERNAL
RESET HINGE
RESTRICTION
PUSH ROD
CHAMBER
INLET
PUSH ROD
CHAMBER
OUTLET
PUSH ROD
CLAPPER IN
"LATCHED" POSITION
CLAPPER IN
"OPEN" POSITION
LEVER
CLAPPER IN
"CLOSED" POSITION
INLET
WEEP HOLE
TO RESET CLAPPER. NOTE: PUSH ROD CHAMBER MUST BE VENTED TO DRAIN.
MODEL DDX VALVE: SECTION VIEW
MODEL DDX VALVE: REAR VIEW
Fig. 1
3.