Tyco DV-5 Manual

Preaction System with DV-5 Deluge Valve
Double Interlock — Electric/Electric Actuation
General
Description
The TYCO DV-5 Double Interlock Pre-
action System with Electric/Electric
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 DV-5 Double Interlock Preaction
System with Electric/Electric Actua-
tion utilizes a DV-5 Deluge Valve and
a Riser Check Valve. The Riser Check
Valve (that does not require the use
of priming water) isolates the Deluge
Valve from the system air pressure. The
releasing trim for the Deluge Valve uti-
lizes a Solenoid Valve that is operated
by energizing the releasing circuit of a
Cross-Zone Deluge Valve Releasing
Panel (automatic control unit).
Zone 1 of the Releasing Panel is oper-
ated by either a fire detection device
or manual pull station. Zone 2 of the
Releasing Panel is operated by a Low
Air Pressure Alarm Switch in response
to a loss of system air pressure due to
the opening of an automatic sprinkler.
The Solenoid Valve remains closed
until it is electrically energized by the
Releasing Panel.
In order for the Double Interlock Preac-
tion System to automatically actuate,
two independent events must occur.
Zone 1 of the Releasing Panel must
operate upon automatic operation
of the electric fire detection initiat-
ing circuit or operation of the electric-
manual pull initiating circuit, and Zone
2 of the Releasing Panel must operate
via the Low Air Pressure Alarm Switch
upon loss of air pressure from the
sprinkler system piping, due to opera-
tion of one or more sprinklers.
The Double Interlock Preaction System
will automatically actuate only when
both Zone 1 and Zone 2 of the Releas-
ing Panel have operated, energizing
the Solenoid Valve. Accidental loss of
system air pressure (e.g.: a lift truck
accidentally dislodges a sprinkler),
or operation of just the fire detection
circuit (e.g.: an accidental operation of
Page 1 of 14
an electric pull station), will only cause
an alarm, and will not actuate the
system or flood the sprinkler system
piping.
The DV-5 Deluge Valve (described 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 example an O.S.&Y. gate valve
or butterfly valve (Fig. 1).
Operation the Solenoid Valve releases
water from the Diaphragm Chamber
faster than it can be replenished
through the 1/8 inch (3,2 mm) restric-
tion provided by the Model ASV-1 Auto-
matic Shut-Off Valve in the diaphragm
supply connections (Item 5 - Fig. 3A,
also described in Technical Data Sheet
TFP1384). 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 into the system piping, as well as
through the Alarm Port to actuate the
system alarms.
DECEMBER 2014
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Contacts
As water flows into the system, the pilot
chamber of the Model ASV-1 Auto-
matic Shut-Off Valve (Item 5 -Fig. 3A)
becomes pressurized and the ASV-1
automatically shuts off the diaphragm
chamber supply flow to the DV-5 Dia-
phragm Chamber. Shutting off the dia-
phragm chamber supply flow prevents
the DV-5 Diaphragm Chamber from
becoming re-pressurized, thereby pre-
venting inadvertent closing of the DV-5
during a fire (as may be the case should
the Solenoid Valve become de-ener-
gized after its initial operation).
NOTICE
The DV-5 Double Interlock Preaction
System with Electric/Electric Actua-
tion described herein must be installed
and maintained in compliance with this
document, as well as with the appli-
cable standards of the National Fire
Protection Association, in addition to
the standards of any other authorities
having jurisdiction. Failure to do so may
impair the performance of the related
devices.
The owner is responsible for main-
taining their fire protection system
and devices in proper operating con-
dition. Contact the installing contrac-
tor or product manufacturer with any
questions.
TFP1465