Operation - Tyco DV-3 Manual

TFP1462
NO. DESCRIPTION QTY.
1 300 psi/ 2000 kPa
Water Pressure Gauge . . 2
2 250 psi/ 1750 kPa
Air Pressure Gauge . . . . . 1
3 1/4" Gauge Test Valve . . 2
4 Model MC-1 Manual
Control Station . . . . . . . . . 1
5 1-1/4" Angle Valve . . . . . . 2
6 1/2" Swing Check Valve 2 .
7 1/2" Spring Loaded
Check Valve . . . . . . . . . . 1
8 1/2" Y-Strainer . . . . . . . . . 1
9 Priming Supply
Restriction . . . . . . . . . . . . 1
10 Model AD-1 Automatic
Drain Valve . . . . . . . . . . . 1
11 Drip Funnel Connector . . 1
12 Drip Funnel Bracket . . . . 1
13 Drip Funnel . . . . . . . . . . . 1
14 1/2" Globe Valve . . . . . . . 1
15 1/2" Ball Valve . . . . . . . . . 2
16 Model DP-1 Dry Pilot
Actuator . . . . . . . . . . . . . . 1
17 24 VDC Solenoid Valve . . 1
18 Waterflow Pressure
Alarm Switch (PS10-2A) . 1
19 Low Air Pressure
Alarm Switch (PS40-1A) . 1
20 Pressure Operated Relief
Valve, PORV . . . . . . . . . . 1
21 1/4" Pressure Relief
Valve . . . . . . . . . . . . . . . . 1
22 3/32" Vent Fitting . . . . . . . 1
23 2-1/2" Rigid Grooved End
Coupling, Figure 772 . . . . 2
24 2-1/2" Grooved End 90°
Elbow, Figure 510 . . . . . . 1
25 System Label . . . . . . . . . . 1
26 1/4" Tubing Connector . . 1
27 1/4" x 30" Tubing . . . . . . . 2
28 1/2" Tubing Connector . . 3
29 1/2" x 30" Tubing . . . . . . . 3
30 1/4" Plug . . . . . . . . . . . . . 2
31 1/2" Plug . . . . . . . . . . . . . 2
32 3/4" Plug . . . . . . . . . . . . . 1
33 1/2" x 1/4" Reducing
Bushing . . . . . . . . . . . . . . 1
34 1/2" Union . . . . . . . . . . . . 7
35 1/2" 90° Elbow . . . . . . . . . 11
36 1/2" 45° Elbow . . . . . . . . . 1
37 1/2" x 1/4" Reducing
Elbow . . . . . . . . . . . . . . . . 1
38 1/2" Tee . . . . . . . . . . . . . . 10
39 1/2" x 1/4" x 1/2" Tee . . . . 3
40 1/2" x 1/2" x 3/4" Tee . . . . 1
41 1-1/4" x 1/2" x 1-1/4" Tee . 1
42 1/4" x 3" Nipple . . . . . . . . 2
43 1/2" x Close Nipple . . . . . 2
44 1/2" x 1-1/2" Nipple . . . . . 30
45 1/2" x 2" Nipple . . . . . . . . 1
46 1/2" x 2" Nipple . . . . . . . . 3
47 1/2" x 3-1/2" Nipple . . . . . 1
48 1/2" x 3-1/2" Nipple . . . . . 1
49 1/2" x 4-1/2" Nipple . . . . . 3
50 1/2" x 7-1/2" Nipple . . . . . 1
51 1/2" x 8-1/2" Nipple . . . . . 1
52 1/2" x 10-1/2" Nipple . . . . 1
53 1/2" x 11-1/2" Nipple . . . . 1
54 1-1/4" x Close Nipple . . . . 2
55 1-1/4" x 3" Nipple . . . . . . . 1
NOTE:
All Fittings and Nipples are galvanized
(Standard Order).
FIGURE 3 — PART 2 of 2
2-1/2 Inch (DN65)
DOUBLE INTERLOCK
PREACTION TRIM
(See Page 4 for Illustration)
In order to readily perform the System
Inspection Procedure described in the
P/N
Care and Maintenance section, it is
recommended that a System Shut-Off
92-343-1-005
Valve be installed above the Model
CV-2 Swing Check Valve, as shown in
92-343-1-012
46-005-1-002
Figure 1. The System Shut-Off Valve
should be a listed or approved (as ap-
52-289-2-001
propriate) indicating valve with a su-
46-048-1-007
pervisory switch to monitor the nor-
46-049-1-004
mally open position.
92-322-1-002
System Air Pressure Requirements
52-353-1-005
Graph B shows the minimum Elec-
92-020-1-009
tric/Pneumatic Double Interlock Pre-
action System air pressure require-
52-793-2-004
ments as a function of the water supply
92-211-1-005
92-211-1-003 pressure. Use of an automatic air or
92-343-1-007
nitrogen device is recommended and
46-047-1-004
may be required by the Authority Hav-
46-050-1-004
ing Jurisdiction.
52-280-1-001
52-287-1-024
The dew point of the air or nitrogen
2571
must be maintained below the lowest
ambient temperature to which the
2572
Double Interlock Preaction System
92-343-1-023
piping will be exposed, or as required
by the Authority Having Jurisdiction.
92-343-1-020
Introduction of moisture into the sys-
92-032-1-002
tem piping that is exposed to freezing
77225ASC temperatures can create ice build up
which could prevent proper operation
51025S
of the system.
N/A
CH
Friction Loss
CH
The nominal pressure losses versus
CH
flow rate for the 2-1/2 inch (DN65)
CH
combination of the Model DV-3 Deluge
CH
CH
Valve, Grooved End Elbow, and Model
CH
CV-2 Swing Check Valve are shown in
Graphs A-1 and A-2.
CH
CH
The approximate friction losses, based
CH
on the Hazen and Williams formula
CH
and expressed in equivalent length of
CH Schedule 40 pipe, with C = 100 is 13.7
CH
feet and with C = 120 is 19.2 feet. The
CH
equivalent length of pipe has been cal-
CH
culated on the basis of the flow rates
CH
typically used with a 2-1/2 inch (DN65)
CH
CH
system.
CH
Electric/Pneumatic Double Inter-
CH
CH
lock Preaction Trim
CH
The DV-3 Electric/Pneumatic Double
CH
Interlock Trim is illustrated in Figure 3.
CH
The nipples utilized in the trim arrange-
CH
CH
ment are Schedule 40 steel per ASTM
CH
A53 or A135 and they are threaded per
CH
ANSI Standard B1.20.1. Fittings are
CH
either malleable iron per ANSI B16.3
CH
or cast iron per ANSI B16.4.
Do not increase the length of the nipple
between the Solenoid Valve and the
Dry Pilot Actuator or the nipple above
the Dry Pilot Actuator. Increasing
either of these two nipple lengths may
impair operation of the system.
NOTE
NOTE
Page 5 of 10

Operation

As indicated in the General Descrip-
tion section, two independent events
resulting in opening of both the Dry
Pilot Actuator and the Solenoid Valve
must occur to actuate the Model DV-3
Electric/Pneumatic Double Interlock
Preaction System.
When the Double Interlock Preaction
System is set for service, the dia-
phragm chamber of the Model DV-3
Deluge Valve is pressurized through
the diaphragm chamber supply con-
nection. The Model DV-3 Deluge Valve
is a differential type valve which de-
pends upon the water pressure in the
diaphragm chamber to hold the center
valve assembly closed against the
water supply pressure.
DV-3 Deluge Valve has a nominal trip
ratio of 2.5 to 1, i.e., the valve operates
when pressure in the diaphragm
chamber is reduced to approximately
two-fifths of the water supply pressure.
The Model DV-3 Automatic Resetting
Deluge Valve is described in TFP1350.
Opening of both the Dry Pilot Actuator
and the Solenoid Valve (16 & 17 - Fig.
3), or operating the Manual Control
Station (4 - Fig. 3) will release water
from the DV-3 diaphragm chamber
faster than it can be replenished
through the 1/8 inch (3,2 mm) diameter
orifice of the Priming Supply Restric-
tion (9 - Fig. 3). A rapid pressure drop
then results in the diaphragm chamber
and the differential between the dia-
phragm chamber and the force differ-
ential holding the center valve assem-
bly down is eliminated. The water
supply pressure then forces the center
valve assembly open, permitting a flow
of water to the Double Interlock Preac-
tion System piping. Water flowing into
the system also flows to the Waterflow
Pressure Alarm Switch (Fig. 3), which
actuates the system alarm signal.
Also, water flowing into the system is
directed to the Model C-1 Pressure
Relief Valve (20 - Fig. C) which, upon
operation, constantly vents the DV-3
diaphragm chamber so as to maintain
the DV-3 Valve in the open (operated)
position.
The Double Interlock Preaction Sys-
tem will automatically operate only
when both the Solenoid Valve and the
Dry Pilot Actuator are open at the
same time. Opening of just the Dry
Pilot Actuator (e.g., a lift truck acciden-
tally dislodges a sprinkler) or just en-
ergizing the Solenoid Valve (e.g., an
accidental operation of an electric pull
station) will only cause an alarm, via
the low air pressure alarm switch or the
deluge valve releasing panel, as appli-
cable, to indicate that the system re-
The Model