Tyco DV-5 Instruction Manual

DV-5 Preaction Type A Valve
EN12845 Compliance
General
Description
Fire protection systems controlled by
the TYCO DV-5 Preaction Type A Valve
utilize automatic sprinklers and a sup-
plemental detection system. The sup-
plemental detection system is typically
comprised of 24 VDC heat detectors,
smoke detectors, and manual pull sta-
tions. Actuation of the detection system
automatically operates (releases) the
DV-5 Deluge Valve, allowing water to
flow into the sprinkler piping system
and to be discharged from any sprin-
klers that may subsequently open. In
the event of loss of power, the DV-5
Deluge Valve with Preaction Type A
Trim will act as a regular dry-pipe valve
station. The Preaction Type A assembly
is rated for a maximum service pres-
sure of 16 bar.
These DV-5 Preaction Type A Valves
have been designed in accordance with
the EN12845 Standard describing Pre-
action Type A Trim criteria. This stan-
dard defines operation as a dry pipe
system activated by an automatic fire
detection system but not operation of
sprinklers.
Typically, the system designer selects
detection components for the DV-5
Preaction Type A Valves that will
respond to a fire sooner than the auto-
matic sprinklers. Consequently, the
system will experience a minimal delay
in water delivery over that for a wet pipe
sprinkler system because the system
will have begun to fill with water before
a sprinkler operates. Preaction Type A
systems will need to be designed as
wet pipe systems or according to the
local authority having jurisdiction.
DV-5 Preaction Type A Valves are gen-
erally used to protect areas where there
is danger of serious water damage that
might result from damaged automatic
sprinklers or piping. Typically, such
areas include computer rooms, storage
IMPORTANT
Refer to Technical Data Sheet
TFP2300 for warnings pertaining to
regulatory and health information.
Page 1 of 16
areas for valuable artifacts, libraries,
and archives.
DV-5 Preaction Type A Valves are also
effectively used to protect properties
where a pre-alarm of a possible fire
condition may allow time for fire extin-
guishment by alternate suppression
means, prior to a sprinkler discharge.
In the event the fire cannot otherwise
be extinguished, the preaction sprinkler
system will then perform as the primary
fire protection system.
DV-5 Deluge Valve
The DV-5 Deluge Valve (Ref. Figure 1), is
a diaphragm-style valve that depends
upon water pressure in the Diaphragm
Chamber to hold the Diaphragm
closed against the water supply pres-
sure. When the DV-5 Preaction Type A
Valve is set for service, the Diaphragm
Chamber is pressurized through the
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Contacts
trim connections from the inlet side of
the system Main Control Valve, such as
an OS&Y gate valve or butterfly valve
(Ref. Figure 6). Refer to Technical Data
Sheet TFP1305 for more DV-5 Deluge
Valve details.
Riser Check Valve
In a DV-5 Preaction Type A Valve, a
Model CV-1FR Riser Check Valve (Ref.
Figure 2), which does not require the
use of priming water, provides an air
check so that the system can be auto-
matically pressurized with a nominal
supervisory air or nitrogen pressure
(Ref. Graph B). A supervisory low/high
pressure alarm switch that is set to
transfer its contacts at nominally 0,7
bar, on decreasing pressure, is uti-
lized to indicate whether there are any
abnormal leaks in the sprinkler system
piping. Loss of air pressure from the
system as a result of a damaged sprin-
TFP1484