DV-5a Automatic Water Control Valve
Double Interlock Preaction Fire Protection Systems
1-1/2 Inch to 8 Inch (DN40 to DN200)
Page 1 of 28 MARCH 2020 TFP1450
Worldwide
Contacts
www.tyco-fire.com
IMPORTANT
Refer to Technical Data Sheet
TFP2300 for warnings pertaining to
regulatory and health information.
General
Description
The TYCO DV-5a Automatic Water
Control Valves are diaphragm type
valves that can be used in double inter-
lock preaction fire protection systems.
When properly trimmed, the double
seat design of the DV-5a Valve also
provides actuation of fire alarms upon
system operation.
The diaphragm style design of the
DV-5a Valve allows external resetting,
providing for easy resetting of a deluge
system without having to open a valve
handhole cover to manually reposition
a clapper and/or latch mechanism.
Simply re-pressurizing the diaphragm
chamber resets the valve.
The DV-5a features internal and exter-
nal coating of the valve to provide
corrosion resistance. The external cor-
rosion resistance of the epoxy coating
permits the use of the DV-5a in cor-
rosive atmospheres associated with
many types of industrial processing
plants and outdoor installations.
The DV-5a Valves are offered with the
DV-5a Valve and separately ordered
semi-assembled trim shown in Figures
6 and 7, or, for ease of installation, with
DV-5a Valve completely trimmed with or
without a System Main Control Valve.
Double interlock preaction systems are
designed for use in applications, such
as refrigerated areas, requiring the
maximum degree of protection against
inadvertent flooding of the sprinkler
system piping. In order for a double
interlock preaction system to automat-
ically activate, two independent events
must occur. First, the electric detection
system must operate, and secondly,
an automatic sprinkler on the system
piping must operate. Typically, the
electric detection system is designed to
operate before any automatic sprinkler.
Operation of just the electric detection,
or just the opening of a sprinkler will
not allow the DV-5a Valve to open and
permit water to flow into the normally
dry sprinkler system piping. However,
operation of just the electric detec-
tion system or the opening of a sprin-
kler (loss of system air pressure) will
result in a supervisory alarm to notify
the building occupants of a condition
needing attention so as to avoid inad-
vertent flooding of the system piping.
The DV-5a Valve is provided with two
forms of actuation: Electric/Electric or
Electric/Pneumatic.
In the case of the Electric/Electric
Actuation, a solenoid valve is used to
hold the DV-5a Valve closed by locking
pressure in the diaphragm chamber of
the DV-5a Valve. In the event of a fire,
Zone 1 of a releasing panel is initiated
by a fire detection or electric manual
pull station, and Zone 2 of the releas-
ing panel is initiated by a low pres-
sure alarm switch triggered by loss of
system air pressure due to the opening
of an automatic sprinkler. Initiating of
Zone 1 and 2 results in opening the
solenoid valve to operate the DV-5a
Valve.
Available End Connections and Weights — lb/(kg)
End Connection
Nominal Valve Size
ANSI Inches
(DN)
Inlet Outlet
1-1/2
(40)
2
(50)
3
(80)
4
(100)
6
(150)
8
(200)
Thread Thread
26
(11,8)
25
(11,3)
N/A N/A N/A N/A
Groove Groove
25
(11,3)
25
(11,3)
60
(27, 2)
95
(4 3,1)
177
(80,3)
327
(148,3)
Flange Groove N/A N/A
66
(30,0)
106
(48,1)
190
(86,2)
346
(157,0 )
Flange Flange N/A N/A
72
(32,7)
116
(52,6)
204
(92,5)
365
(165,6)
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