TFP1090
Page 5 of 20
Relief Port and the Anti-Flood Valve
is depressed downward into the Pilot
Chamber Inlet Port, venting the Pilot
Chamber.
The system pressure in the Inlet
Chamber then forces (raises) the
Exhaust Valve off its seat. This contin-
ues the rotation of the Lever into the
tripped (latched) position (Ref. Figure
6). As the Exhaust Valve is raised off
its seat, system pressure is transmit-
ted to the intermediate chamber of the
Dry Pipe Valve which neutralizes the
differential pressure holding the valve
closed.
Water and any water borne debris such
as silt is prevented from entering the
Pilot Chamber by virtue of the Anti-
Flood Valve having sealed off its inlet
port.
After the accelerator/Dry Pipe Valve
has tripped and the sprinkler system
has been drained, the piping from the
system to the Accelerator must also
be drained and the Accelerator reset/
inspected according to the instructions
given in the Valve Setting Procedure
section.
The rate-of-flow through the Restric-
tion has been set such that the Model
ACC-1 Dry Pipe Valve Accelerator pro-
vides the maximum practical sensitiv-
ity to a loss in system pressure due to
a sprinkler operation while still being
capable of automatically compensating
for normal variations in system pres-
sure such as are caused by environ-
mental temperature changes. A test for
verifying that the rate-of-flow through
the Restriction is within the range for
optimum Accelerator performance is
given in the Valve Setting Procedure
section.
Installation
NOTICE
Alteration of the trim may prevent the
Model DPV-1 Valve from functioning
properly, as well as void approvals and
the manufacturer’s warranties.
Failure to latch open the Clapper
Assembly prior to a system hydro-
static test may result in damage to the
Clapper Assembly.
The Model DPV-1 Valve must be
installed in a readily visible and acces-
sible location.
The DPV-1 Valve and associated trim
must be maintained at a minimum tem-
perature of 4°C.
Heat tracing of the Model DPV-1 Valve
or its associated trim is not permit-
ted. Heat tracing can result in the for-
mation of hardened mineral deposits
that are capable of preventing proper
operation.
Install TYCO Model DPV-1 Dry Pipe
Valves in accordance with the follow-
ing criteria:
Step 1. The Model DPV-1 Dry Pipe
Valve must be installed with factory
assembled trim.
Step 2. Suitable provision must be
made for disposal of drain water. Drain-
age water must be directed such that
it will not cause accidental damage to
property or danger to persons.
Step 3. Installation of an Air Mainte-
nance Device, as described in the Tech-
nical Data Section, is recommended.
Step 4. An Inspector’s Test Connec-
tion must be provided on the system
piping at the most remote location from
the Model DPV-1 Dry Pipe Valve.
Step 5. Conduit and electrical con-
nections are to be made in accordance
with the requirements of the authority
having jurisdiction.
Step 6. Before a system hydro-
static test is performed in accordance
with the standards recognized by the
Approval agency, in addition to any
other authorities having jurisdiction,
the Clapper Assembly is to be man-
ually latched open (Ref. Figure 3D);
the Automatic Drain Valve (Ref. Fig-
ures 7 through 14) is to be temporar-
ily plugged; and, the Handhole Cover
Bolts are to be tightened using a cross-
draw sequence.
2000 3000
0,08
0,03
0,04
0,06
0,10
0,20
0,30
0,40
1000
0,02
0,01
600 4000 6000
NOMINAL PRESSURE DROP IN BAR
FLOW RATE IN LITERS PER MINUTE (LPM)
DN100
DN150
GRAPH A
DN100 AND DN150 MODEL DPV-1 DRY PIPE VALVE
NOMINAL PRESSURE LOSS VERSUS FLOW
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