Wet Pilot Actuation - Tyco DV-3 Manual

Page 4 of 20
SYSTEM PIPING WITH OPEN NOZZLES OR SPRINKLERS - NORMALLY DRY
(MINIMUM 1/2" PIPE AND
AUTOMATIC SPRINKLERS)
LOCAL
MANUAL
CONTROL
STATION
CHAMBER SUPPLY
CONTROL VALVE
(NORMALLY OPEN)
Wet Pilot
Actuation
The Wet Pilot Actuation Trim provides
for connection of a detection system
consisting of pilot sprinklers (heat de-
tectors) and manual control stations
interconnected with minimum 1/2 inch
(DN15) Schedule 40 steel pipe. The
pilot line is connected to the "Wet Pilot
Detection" connection shown in Fig-
ures 4 and 12. Nominal installation di-
mensions for the Wet Pilot Actuation
Trim are shown in Figure 4.
Pilot sprinklers are to be minimum 5.6
K-factor orifice listed or approved
automatic sprinklers. Manual Control
Stations are to be the Model MC-1
described in Technical Data Sheet
TD1382.
The maximum height of a wet pilot line
above the DV-3 Valve must not exceed
the limitations given in Graph B as a
function of the minimum water supply
pressure to the DV-3 Valve and the
length of the pilot line to the most re-
mote pilot sprinkler.
WET PILOT SPRINKLER
DETECTION SYSTEM
DRAIN
DRAIN VALVE
(NORMALLY
DIAPHRAGM
CHAMBER
DIAPHRAGM
CONNECTION
SYSTEM SCHEMATIC — WET PILOT ACTUATION
Provision must be made for installing
a 5.6 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 man-
ual control station).
Operation of a pilot sprinkler or open-
ing of a manual control station results
in a rapid pressure drop in the Dia-
phragm Chamber of the DV-3 Valve,
and the force differential holding the
Center Valve Assembly down in the
set position is reduced to below the
valve trip point.
Wet Pilot Lines must be maintained at
a minimum temperature of 40°F/4°C.
It is recommended that internally gal-
vanized pipe and cast iron fittings be
used for wet pilot lines.
DIAPHRAGM
CHAMBER
PRESSURE
GAUGE
RESTRICTION
MAIN
CLOSED)
DRAIN
SUPPLY
WATER
SUPPLY
FIGURE 2
NOTES
INSPECTOR'S TEST CONNECTION
(AT THE MOST HYDRAULICALLY
DEMANDING LOCATION OF THE
WET PILOT LINE)
REMOTE
MANUAL
CONTROL
DRAIN
STATION
(WHEN
SPECIFIED)
DELUGE
VALVE
WATERFLOW
PRESSURE
ALARM SWITCH
WATER SUPPLY
PRESSURE
GAUGE
MAIN
CONTROL VALVE
(NORMALLY
OPEN)
TFP1350
DRAIN