Model DPV-1 Dry Pipe Valve
Model ACC-1 Dry Pipe Valve Accelerator
European Conformity Valve Trim
Page 1 of 26 JULY 2020 TFP1090
Worldwide
Contacts
www.tyco-fire.com
IMPORTANT
Refer to Technical Data Sheet
TFP2300 for warnings pertaining to
regulatory and health information.
Accelerator
The optional TYCO Model ACC-1
Dry Pipe Valve Accelerator is a quick
opening device that is intended to
reduce the time for valve operation fol-
lowing the operation of one or more
automatic sprinklers. The Model ACC-1
Accelerator automatically adjusts to
both small and slow changes in system
pressure, but trips when there is a rapid
and steady drop in pressure (as in the
case of a sprinkler operation). Upon
tripping, the Accelerator transmits
system air pressure to the intermediate
chamber of the Model DPV-1 Dry Pipe
Valve. This neutralizes the differen-
tial pressure holding the Model DPV-1
Dry Pipe Valve closed and permits it
to open.
The Model ACC-1 Dry Pipe Valve
Accelerator has a unique, positive
action, internal anti-flood device and
a ball float which combine to prevent
water and water borne debris from
entering the more sensitive operating
areas of the accelerator. The anti-flood
device seals and latches immediately
upon operation of the Model ACC-1 Dry
Pipe Valve Accelerator without waiting
for a pressure build-up in the intermedi-
ate chamber of the Dry Pipe Valve. The
latching feature keeps the anti-flood
device sealed, even while the system
is being drained. The ball float seals the
pilot chamber inlet port if there is an
inadvertent trip of the Dry Pipe Valve,
due for example, to an air compressor
failure combined with a slow loss in
system air pressure due to a leak.
NOTICE
The Model DPV-1 Dry Pipe Valves and
Model ACC-1 Dry Pipe Valve Accelera-
tors described herein must be installed
and maintained in compliance with this
document and the standards recog-
nized by the Approval agency, in addi-
tion to any other authorities having
jurisdiction. Failure to do so may impair
the performance of these devices.
The owner is responsible for maintain-
ing their fire protection system and
devices in proper operating condition.
The installing contractor or manufac-
turer should be contacted with any
questions.
General
Description
Dry Pipe Valve
The TYCO Model DPV-1 Dry Pipe Valve
is a differential valve for automatically
controlling the flow of water into dry
pipe fire protection sprinkler systems
upon operation of one or more auto-
matic sprinklers. The Model DPV-1 Dry
Pipe Valve also provides for actuation
of fire alarms upon system operation.
The valve is available in four sizes:
DN65, DN80, DN100, and DN150.
Features for the Model DPV-1 Dry Pipe
Valve are as follows:
• External reset
• 16 bar pressure rating
• Unique offset single clapper design
enabling a simple compact valve to
minimize installation labor
• Ductile iron construction to ensure
a lightweight valve to minimize ship-
ping cost
• A variety of inlet and outlet
connections
• Simple reset procedure through the
elimination of priming water
Dry pipe sprinkler systems are used
in unheated warehouses, parking
garages, store windows, attic spaces,
loading docks, and other areas
exposed to freezing temperatures,
where water filled pipe cannot be uti-
lized. When set for service, the dry
pipe sprinkler system is pressurized
with air (or nitrogen). The loss of pres-
sure through an operated automatic
sprinkler in response to heat from a
fire permits the Model DPV-1 Dry Pipe
Valve to open and allow a flow of water
into the sprinkler system piping. Table
B establishes the minimum required
system air pressure that includes a
safety factor to help prevent false oper-
ations that occur due to water supply
fluctuations.
Nominal
Valve
Size
Alarm
Test
Valve
With
Accelerator
Figure
DN65
Three
Way
7
✓
13
Standard
10
✓
16
DN80
Three
Way
7
✓
13
Standard
10
✓
16
DN100
Three
Way
8
✓
14
Standard
11
✓
17
DN150
Three
Way
12
✓
15
Standard
10
✓
18
TABLE A
EUROPEAN CONFORMITY
VALVE TRIM CONFIGURATIONS
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