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Step 10g. When the air pressure
in the Differential Chamber of the
Accelerator is equal to that in the
system, then the Accelerator is set
and ready for service.
Step 10h. Close the Accelerator
Control Valve and then slowly open
the Low Body Drain Valve in the
trim, to bleed off any excess water
trapped above the Dry Pipe Valve
Clapper. Close the Low Body Drain
Valve, return system pressure to its
normal value, and then re-open the
Accelerator Control Valve.
Step 11. Partially open the Main Con-
trol Valve. Slowly close the Main Drain
Valve as soon as water discharges from
the drain connection.
Verify that there is not any water dis-
charging from the Automatic Drain
Valve.
The absence of water discharging from
the Automatic Drain Valve is an indica-
tion of a properly set water seat within
the Model DPV-1 Preaction Type B
Valve. If water is discharging, see the
Care and Maintenance section under
the Automatic Drain Valve Inspection
to determine/correct the cause of the
leakage problem.
If there are no leaks, the Model DPV-1
Preaction Type B Valve is ready to be
placed in service and the Main Control
Valve must then be fully opened.
After setting a fire protection system,
notify the proper authorities and advise
those responsible for monitoring pro-
prietary and/or central station alarms.
Step 12. Once a week after a valve is
reset following an operational test or
system operation, the Low Body Drain
Valve (and any low point drain valves)
should be partially opened (and then
subsequently closed) to relieve drain-
back water. Continue this procedure
until drain-back water is no longer
present.
Care and
Maintenance
The following procedures and inspec-
tions should be performed as indicated,
in addition to any specific require-
ments of any authority having jurisdic-
tion. Impairments must be immediately
corrected.
Before closing a fire protection system
Main Control Valve for maintenance
work on the fire protection system
that it controls, obtain permission to
shut down the affected fire protection
systems must first be obtained from the
proper authorities and notify all person-
nel who may be affected by this deci-
sion must be notified.
The owner is responsible for the
inspection, testing, and maintenance of
their fire protection system and devices
in compliance with this document, as
well as with the applicable standards
of any authority having jurisdiction. The
installing contractor or product manu-
facturer should be contacted relative to
any questions.
Automatic sprinkler systems are rec-
ommended to be inspected, tested,
and maintained by a qualified Inspec-
tion Service.
The operational test procedure and
waterflow pressure alarm test pro-
cedure will result in operation of the
associated alarms. Consequently,
notification must first be given to the
owner and the fire department, central
station, or other signal station to which
the alarms are connected.
Annual Operation
Test Procedure
Proper operation of the Model DPV-1
Preaction Type B Valve (that is, opening
of the Model DPV-1 Preaction Type B
Valve during a fire condition) should be
verified at least once a year as follows:
Step 1. If water must be prevented
from flowing beyond the riser, perform
the following steps:
• Close the Main Control Valve.
• Open the Main Drain Valve.
• Open the Main Control Valve one turn
beyond the position at which water
just begins to flow from the Main
Drain Valve.
• Close the Main Drain Valve.
Step 2. Trip the Model DPV-1 Preac-
tion Type B Valve by one of the follow-
ing methods:
• Test the Automatic Fire Detection
Releasing Panel in accordance with
the manufacturer's instructions to
energize the Solenoid Valve.
• Open the system's Inspector's Test
connection.
Notes: Be prepared to quickly per-
form Steps 3, 4, and 5, if water
must be prevented from flowing
beyond the riser.
The method of trip testing is rec-
ommended to be alternated from
year to year between testing of the
Automatic Fire Detection Releasing
Panel and opening of the Inspector's
Test Connection.
Step 3. Verify that the Model DPV-1
Preaction Type B Valve has tripped, as
indicated by the flow of water into the
system.
Step 4. Close the system's Main Con-
trol Valve.
Page 15 of 18
Step 5. Close the Air Supply Control
Valve.
Step 6. Reset the system in accor-
dance with the Valve Setting Procedure.
Periodic Waterflow Alarm
Test Procedure
Testing of the system waterflow
alarms should be performed periodi-
cally based on the requirements of the
authority having jurisdiction. To test the
waterflow alarm, open the Alarm Test
Valve, to allow a flow of water to the
Waterflow Pressure Alarm Switch and/
or Water Motor Alarm. Upon satisfac-
tory completion of the test, close the
Alarm Test Valve.
Water Pressure
Inspection Procedure
The Water Pressure Gauge is to be
inspected periodically based on the
requirements of the authority having
jurisdiction to ensure that normal
system water pressure is being
maintained.
Air Pressure
Inspection Procedure
The Air Pressure Gauge is to be
inspected periodically based on
the requirements of the author-
ity having jurisdiction to ensure that
normal system air pressure is being
maintained.
Automatic Drain Valve
Inspection Procedure
The Automatic Drain Valve should be
inspected periodically based on the
requirements of the authority having
jurisdiction by depressing the plunger
and checking to ensure that the Auto-
matic Drain Valve is not discharging
water and/or air. A discharge of water
and/or air is an indication that the air
and/or water seats are leaking, which
could subsequently cause a false oper-
ation should the intermediate chamber
become inadvertently pressurized.
If leakage is present, take the Model
DPV-1 Preaction Type B Valve out of
service (that is, close the Main Control
Valve, open the Main Drain Valve, close
the Air Supply Control Valve, remove
the Dry Pipe Valve Accelerator from
service, by closing the Accelerator
Control Valve, and open the Inspector's
Test Connection to relieve the system
air pressure to 0 psig as indicated on
the System Air Pressure Gauge), and
then after removing the Handhole
Cover, perform the following steps:
Step 1. Make sure that the Seat Ring
is clean and free of any nicks or signifi-
cant scratches.
Step 2. Remove the Clapper Assem-
bly from the valve by first pulling out
the Hinge Pin.
TFP1486
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