Dry Pilot
Actuation
The Dry Pilot Actuation Trim forms a
part of the laboratory approval of the
DV-5 Valves and is necessary for their
proper operation.
The Dry Pilot Actuation Trim provides
for installation of a detection system
consisting of pilot sprinklers (heat de-
tectors) and manual control stations
interconnected with minimum DN15
steel pipe. The dry pilot line, which is
to be pressurized with air or nitrogen,
is connected to the “Dry Pilot Line
Connection” shown in Figure 5.
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 Dry Pilot Actuation Trim is provid-
ed with a Model DP-1 Dry Pilot Actu-
ator, which is described in Technical
Data Sheet TFP1380. The Actuator is
rated for use at a maximum pilot ser-
vice pressure of 3,4 bar and a maxi-
mum water supply service pressure of
16 bar.
Graph B (Page 9) shows the “minimum
pilot line service pressure” as a func-
tion of the water supply pressure. The
pressure in the dry pilot actuation sys-
tem must be automatically maintained
using one of the following maintenance
devices, as appropriate.
• Model AMD-1 Air Maintenance De-
vice (pressure reducing type), refer
to Technical Data Sheet TFP1221.
• Model AMD-2 Air Maintenance De-
vice (compressor control type), refer
to Technical Data Sheet TFP1231.
• Model AMD-3 Nitrogen Mainte-
nance Device (high pressure reduc-
ing type), refer to Technical Data
Sheet TFP1241.
Supervision of the pressure in the dry
pilot actuation system and an alarm
that separately indicates operation of
the detection system is provided by
a low pressure alarm switch set as
follows:
• Low pressure alarm setting at ap-
proximately 0,4 bar below the mini-
mum pilot line service pressure re-
quirement shown in Graph B (page
9).
• Fire alarm setting at approximately
1,0 bar below the minimum pilot line
service pressure requirement shown
in Graph B (Page 9).
The Dry Pilot Low Pressure Switch may
be ordered as option with the valve
trim or separately ordered.
The Pressure Relief Valve provided
in the trim is factory set to relieve at
a pressure of approximately 3,1 bar;
however, it may be field adjusted to a
lower pressure, if required.
The dry pilot line is to be provided with
low point drains to enable draining on
condensate.
NOTE
At a minimum, it is recommended that
internally galvanized pipe and cast iron
fittings be used for dry pilot lines.
2
G
C
R
B
1
P
Q
E
H
J
F
A
3
M
N
K
V
S
L
4
T
U
WATER SUPPLY PRESSURE IN BAR
RANGE
O
F
ACTUA
T
O
R
OPE
NING
PRESSURE
MINIM
U
M
SYSTEM
AI
R
PRES
SURE
S
S
E
R
P
R
I
A
E
R
U
R
A
B
N
I
1,0
1,0
0
2,0
3,0
4,0 7,0 10,0 13,0 16,0
DV-5 Valve
Description
Waterflow Switch
(Not used)
System Drain Valve
Automatic Drain Valve
Diaphragm Gauge
Alarm Control Valve
Water Supply Gauge
Alarm Test Valve
Diaphragm Supply Valve
Automatic Shut-Off Valve
Manual Control Station
Dry Pilot Actuator
Dry Pilot Low Pressure Switch
Dry Pilot Air Supply Valve
Diaphragm Supply Strainer
System Gauge
Stop Valve
Diaphragm Supply Connection
Water Motor Alarm Connection
Pressure Relief Valve
Dry Pilot Air Supply Connection
Dry Pilot Line Connection
Dry Pilot Line Gauge
C
T
4
1
2
3
V
U
L
P
R
S
Q
N
M
G
K
H
J
F
D
E
Item
A
B
FIGURE 5
DRY PILOT ACTUATION
(Refer to Figure 11 thru 14 for specific Bills of Materials)
TFP1338 Page 7 of 28
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