Tyco DN40 - Page 6

TFP1335
Page 6 of 26
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
detectors) 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 Con-
nection shown in Figure 5.
Installation dimensions are provided in
Figure 19.
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 provided
with a Model DP-1 Dry Pilot Actuator,
which is described in Technical Data
Sheet TFP1380. The Actuator is rated
for use at a maximum pilot service
pressure of 3,4 bar and a maximum
water supply service pressure of 17,2
bar.
Graph B shows the “minimum pilot line
service pressure” as a function of the
water supply pressure. The pressure in
the dry pilot actuation system must be
automatically maintained using one of
the following maintenance devices, as
appropriate.
• Model AMD-1 Air Maintenance
Device (pressure reducing type),
refer to Technical Data Sheet
TFP1221
• Model AMD-2 Air Maintenance
Device (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
approximately 0,4 bar below the
minimum pilot line service pressure
requirement shown in Graph B
• Fire alarm setting at approximately
1,0 bar below the minimum pilot line
service pressure requirement shown
in Graph B
The Dry Pilot Low Pressure Switch may
be ordered as an 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 recom-
mended that internally galvanized pipe
and cast iron fittings be used for dry
pilot lines.
Diaphragm Supply Valve
Diaphragm Supply Connection
Dry Pilot Air Supply Connection
Dry Pilot Line Connection
Water Motor Alarm Connection
Dry Pilot Low Pressure Switch
Dry Pilot Line Gauge
Dry Pilot Air Supply Valve
Dry Pilot Actuator
Diaphragm Supply Strainer
Stop Valve
Alarm Control Valve
System Gauge
Automatic Shut-Off Valve
Manual Control Station
Diaphragm Gauge
Water Supply Gauge
System Drain Valve
Alarm Test Valve
Automatic Drain Valve
Main Drain Valve
Waterow Switch
DV-5 Valve
Description
Pressure Relief Valve
Q
P
N
M
C
H
G
J
F
D
A
E
S
R
T
B
A
B
C
D
E
F
G
H
J
K
L
M
N
P
Q
R
S
T
U
1
2
3
4
Item
U
K
4
3
2
1
L
V
V
FIGURE 5
DRY PILOT ACTUATION
(Refer to Figure 11 thru 14 for specific Bills of Materials)