Instruction manual
5.
System Operation
To fully operate a Single Interlock Preaction System, two
independent events must coexist before water flow will oc-
cur. One electrical detector (two detectors in a cross-zoned
system) must activate and a sprinkler head must open. Op-
eration of either one of these items will only cause an alarm
to annunciate, but will not cause water to discharge from the
sprinkler system piping.
When set correctly for service, the Model DDX Deluge
Valve is hydraulically established to withhold the supply
water from the sprinkler system piping. The Reliable Model
DDX Deluge Valve is shown in both the closed and open
positions in Fig.1. In the closed position, the supply pres-
sure acts on the underside of the clapper and also on the
push rod through the push rod chamber’s inlet restriction.
The resultant force due to the supply pressure acting on the
push rod is multiplied by the mechanical advantage of the
lever and is more than sufficient to hold the clapper closed
against normal supply pressure surges.
When a fire is detected, the energized solenoid valve vents
the push rod chamber to atmosphere through the chamber’s
outlet. Since the pressure cannot be replenished through
the inlet restriction as rapidly as it is vented, the push rod
chamber pressure falls instantaneously. When the push rod
chamber pressure approaches approximately one-third of
the supply pressure, the upward force of the supply pres-
sure acting beneath the clapper overcomes the lever-ap-
plied force thereby opening the clapper.
Once the clapper has opened, the lever acts as a latch,
preventing the clapper from returning to the closed posi-
tion. Water from the supply flows through the Deluge Valve
into the system piping. Water also flows through the Deluge
Valve alarm outlet to the alarm devices.
Single Interlock Electric Release Preaction Trim Parts List (Refer to Fig. 2)
Item
No.
Part Number Description
No.
Req’d
46 98614403 Plug, ¼” 3
47 98614401 Plug, ¾” 2
48 98727607 Strainer, ¼” 1
49 96606630 Tee, 1¼” x 1¼” x 1” 1
50 96606607 Tee, ½” x ½” x ¼” 2
51 98761649 Tee, ½” x ¼” x ½ 1
52 98761651 Tee, ½” 1
53 96606612 Tee, ¾” x ½”x ½” 1
54 96606601 Tee, ¾” 1
55 89141112 Tie, Retaining 9
56 98815204 Union, ½”, O-Ring Seal 1
57 98815200 Union, ½” 2
58 98840160 3-Way Valve, ¼” 1
59 98840106 Valve, Angle, 1¼” 1
60 98840101 Valve, Angle, ¼” 1
61 78653100 Valve, Ball Drip, ½” 1
62 98840117 Valve, Ball, ¼”NPTF x ¼” NPTM 1
63 98840145 Valve, Check, 1” 1
64 98840181 Valve, Check, ½” 1
65 98840187 Valve, Check, ¼” NPTF x ¼” NPTM 1
66 98840171 Valve, Globe, ½” 1
67 ----- ----- 1
68 96686722 Tubing, Copper, 3/8” O.D. x 2 ft. 1
69 96686756 Tubing, Plastic, 3/8” I.D. x 6 ft. 1
70 98840172 2-Way Valve, ¼” 1
Item
No.
Part Number Description
No.
Req’d
1
6103022000 Assembly, Valve, 2” (50mm) DDX
1
6103022500 Assembly, Valve, 2
1
/
2
”” (65mm) DDX
6103030000 Assembly, Valve, 3” (80mm) DDX
6103027600 Assembly, Valve, 76mm DDX
2
7G05080800 Coupling, Rigid, 2” (50mm)
17G05101000 Coupling, Rigid, 2½” (65mm)
7G05121200 Coupling, Rigid, 3” (80mm)
3
6205212000 Water - Ball Valve, 2” (50mm)
16215051000 Water - Butterfly Valve, 2½” (65mm)
6215051200 Water - Butterfly Valve, 3” (80mm)
4
7D05414200
Coupling, 2” (50mm) Grooved
w/ ½” NPT outlet
17D05424200
Coupling, 2½” (65mm) Grooved
w/ ½” NPT outlet
7D05434200
Coupling, 3” (80mm) Grooved
w/ ¾” NPT outlet
5
6871020000 Valve, Solenoid (175 psi)
1
6871020020 Valve, Solenoid (250 psi)
6 98048025
Bushing, Reducer, ¾” x ¼”
(2” & 2½” Valve only)
1
Bushing, Reducer, ¾” x ¼”
(3” Valve only)
2
7 98048000
Bushing, Reducer, ½” x ¼”
(2” & 2½” Valve only)
1
Bushing, Reducer, ½” x ¼”
(3” Valve only)
--
8 78653000 Model B Manual Emergency Station 1
9 78653004 Valve, Caution Station, ½” 1
10 98048015 Reducer, 2” x 1”, PVC 1
11 98048022 Bushing, Reducer, ¾” x ½” 1
12 96816902 Valve, Check, ¼” In-Line 1
13 92056810 Brass Connector, 3/8” ID x ½” NPT 1
14 92056702 Brass Connector. 3/8” Tubing x ¼’ NPT 2
15 92056704 Elbow Connector, 3/8” Tube x ½” NPT 1
16 92056705 Elbow Connector, 3/8” Tube x ¼” NPT 1
17 98050004 Drain Cup, PVC 1
18 98174400 Street Elbow, ½” 2
19 98543227 Nipple, ¼” x Close 1
20 98174414 Elbow, 1¼” 1
21 98174403 Elbow, 1” 1
22 98174401 Elbow, ½ 1
23 98174404 Elbow, ¼” 1
24 98174402 Elbow, ¾” 1
25 96920912 Flex Line, ½” 1
26 98248000 Gauge, Pressure, Air 1
27 98248001 Gauge, Pressure, Water 2
28 94616917 Nameplate, Single Interlock 1
29 98543239 Nipple, 1¼” x 3” 1
30 98543250 Nipple, 1¼” x 4” 1
31 98543285 Nipple, 1¼” x Close 1
32 98543263 Nipple, 1” x 3” 2
33 98543213 Nipple, 1” x Close 1
34 98543223 Nipple, ½” x 1½” 7
35 98543228 Nipple, ½” x 4½” 1
36 98543209 Nipple, ½” x 2” 4
37 98543230 Nipple, ½” x 3” 2
38 98543212 Nipple, ½” x Close 4
39 98543226 Nipple, ¼” x 1½” 3
40 98543243 Nipple, ¼” x 4” 1
41 98543232 Nipple, ¾” x 2” 1
42 98543231 Nipple, ¾” x 3” 1
43 99080002 Pad-Adhesive 1
44 98750003 Cross ½” 1
45 98604406 Plug, ½” 1