Tyco DN40 Manual

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Preaction System with Model DV-5 Deluge Valve
Double Interlock — Electric/Pneumatic Actuation
1-1/2 thru 8 Inch (DN40 and DN200)
General
Description
The Model DV-5 Double Interlock Pre-
action System with Electric/Pneumatic
Actuation (Fig. 1) is designed for use
in applications, such as refrigerated
areas, requiring the maximum degree
of protection against inadvertent flood-
ing of the sprinkler system piping.
The Model DV-5 Double Interlock Pre-
action System with Electric/Pneumatic
Actuation utilizes a Model DV-5 Deluge
Valve and a Riser Check Valve. The
Riser Check Valve (that does not re-
quire the use of priming water) isolates
the Deluge Valve from the system air
pressure. The releasing trim for the
Deluge Valve utilizes a Solenoid Valve
and a Dry Pilot Actuator in a series
configuration. The system air pressure
holds the Dry Plot Actuator closed,
whereas the Solenoid Valve remains
closed until it is electrically energized
by a Deluge Valve Releasing Panel
(automatic control unit). The Releas-
ing Panel is operated by either a fire
detection device or manual electric
pull station.
In order for the Double Interlock Pre-
action System to automatically actu-
ate, two independent events must oc-
cur. The deluge valve releasing panel
must operate and open the Solenoid
Valve upon automatic operation of the
electric fire detection initiating circuit
or manual operation of the electric-
manual pull initiating circuit, and the
sprinkler system piping must lose air
pressure due to operation of one or
more sprinklers.
The Double Interlock Preaction Sys-
tem will automatically actuate only
when both the Dry Pilot Actuator and
the Solenoid Valve are open at the
same time. Accidental opening of just
the Dry Pilot Actuator (for example: a
lift truck accidentally dislodges a sprin-
kler), or just energizing the Solenoid
Valve (for example: an accidental op-
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eration of an electric pull station), will
only cause an alarm, and will not actu-
ate the system or flood the sprinkler
system piping.
The Model DV-5 Deluge Valve (de-
scribed in Technical Data Sheet
TFP1305) is a diaphragm style valve
that depends upon water pressure in
the Diaphragm Chamber to hold the
Diaphragm closed against the water
supply pressure. When the DV-5 Valve
is set for service, the Diaphragm
Chamber is pressurized through the
trim connections from the inlet side of
the system's main control valve, for
MARCH, 2005
example an O.S.&Y. gate valve or but-
terfly valve (Fig. 1).
Operation of the Solenoid Valve and
Dry Pilot Actuator at the same time
releases water from the Diaphragm
Chamber faster than it can be replen-
ished through the 1/8 inch (3,2 mm)
Priming Supply Restriction (Item 7 -
Fig. 2A) in the diaphragm supply con-
nections. This results in a rapid pres-
sure drop in the Diaphragm Chamber
below the valve trip point. The water
supply pressure then forces the Dia-
phragm open permitting water to flow
(TEXT CONTINUED ON PAGE 9)
TFP1460