Wet Pilot
Actuation
The Wet Pilot Actuation Trim forms a
part of the laboratory approval of the
DV-5 Valves and is necessary for their
proper operation.
The Wet Pilot Actuation Trim provides
for connection of a detection system
consisting of wet pilot line sprinklers
(heat detectors) and manual control
stations interconnected with minimum
DN15 steel pipe. The pilot line is con-
nected to the Wet Pilot Line Connec-
tion shown in Figure 4.
Installation dimensions are provided in
Figure 19 (Page 26).
Pilot sprinklers are to be minimum 80
K-factor orifice approved automatic
sprinklers. Manual Control Stations
are to be the Model MC-1 described in
Technical Data Sheet TFP1382.
The maximum height of a wet pilot line
above the DV-5 Valve must not exceed
the limitations shown in Table B (Page
9) as a function of the minimum water
supply pressure to the DV-5 Valve for
an equivalent length (pipe plus fittings)
of the pilot line up to 150 meters to the
most remote pilot sprinkler.
Provision must be made for installing
a 80 K-factor orifice, Inspector’s Test
Connection at the most hydraulically
demanding location of a wet pilot line
(usually adjacent to the highest and
most remote wet pilot sprinkler or
manual control station).
NOTES
Wet Pilot Lines must be maintained at
a minimum temperature of 4°C.
At a minimum, it is recommended that
internally galvanized pipe and cast
iron fittings be used for wet pilot lines.
Q
B
1
P
C
G
2
H
F
J
A
E
L
1 Diaphragm Supply Connection
3
2
Wet Pilot Line Connection
Water Motor Alarm Connection
C
N
3
K
M
N
P
Q
L
M
K
F
J
H
G
E
D
Item
A
B
Waterflow Switch
Diaphragm Supply Valve
Manual Control Station
Diaphragm Supply Strainer
Automatic Shut-Off Valve
Diaphragm Gauge
System Gauge
Automatic Drain Valve
Water Supply Gauge
Alarm Control Valve
Alarm Test Valve
System Drain Valve
(Not used)
DV-5 Valve
Description
Stop Valve
FIGURE 4
WET PILOT ACTUATION
(Refer to Figure 7 thru 10 for specific Bills of Materials)
Page 6 of 28 TFP1338
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