TFP1484
Page 11 of 16
Valve Setting
Procedure
With reference to Figures 5 and 6,
perform these steps when initially
setting the DV-5 Preaction Type A
Valve, after an operational test of the
fire protection system, or after system
operation due to a fire.
Step 1. Close the Main Control/Shut-
off Valve.
Step 2. Close the Diaphragm Chamber
Supply Control Valve and the Air Supply
Control Valve.
Step 3. Open the Main Drain Valve,
System Drain Valve, and all auxil-
iary drains in the system. After water
ceases to discharge, close the System
Drain Valve and auxiliary drain valves.
Leave the Main Drain Valve open.
Step 4. Depress the plunger of the
Automatic Drain Valve to verify that it
is open and that the Preaction Type A
Trim is completely drained.
Step 5. Clean the Strainers in the Dia-
phragm Chamber Supply connection
and in the pneumatic actuation loop
by removing the clean-out plug and
strainer basket.
Step 6. Replace operated automatic
sprinklers on the system piping.
NOTICE
In order to prevent the possibility of a
subsequent operation of an overheated
solder type automatic sprinkler, any
solder type automatic sprinklers that
were possibly exposed to a tempera-
ture greater than their maximum rated
ambient must be replaced.
Step 7. Reset the Local Hydraulic
Manual Pull Station by pushing the
operating lever up; however, do not
close the hinged cover at this time.
Step 8. Reset the Deluge Valve Releas-
ing Panel in accordance with the manu-
facturer’s instructions.
Step 9. Re-establish system air pres-
sure to reset the Model DP-1 Dry Pilot
Actuator by opening the Air Supply
Control Valve, which allows the
system to automatically re-establish
its nominal air pressure. Observe the
Automatic Drain Valve for leaks. If there
are leaks, determine/correct the cause
of the leakage problem within the Riser
Check Valve.
Step 10. Drain the actuation loop to
remove any water out of the piping.
Step 11. Re-establish system air pres-
sure to reset the Model DP-1 Dry Pilot
Actuator if applicable.
Step 12. Open the Diaphragm
Chamber Supply Control Valve and
allow time for full pressure to build up
in the Diaphragm Chamber.
Step 13. Operate (open) the Manual
Control Station to vent trapped air
from the Diaphragm Chamber. If nec-
essary, first open the hinged cover, and
then fully pull down on the operating
lever. Slowly close the operating lever,
by pushing it up, after aerated water
ceases to discharge from the Manual
Control Station drain tubing. Close the
hinged cover and insert a new break
rod in the small hole through the top of
the enclosing box.
Step 14. Inspect the drain connections
from the Manual Control Station and
the Solenoid Valve. Correct any leaks
must before proceeding to the next
step.
Step 15. Verify the ability for the DV-5
Diaphragm to hold pressure as follows:
With the diaphragm chamber pressur-
ized per Step 8, temporarily close the
Diaphragm Chamber Supply Control
Valve, and monitor the Diaphragm
Chamber Pressure Gauge for a drop
in pressure. If a drop in pressure is
noted, the DV-5 Diaphragm is to be
replaced and/or any leaks must be cor-
rected before proceeding to the next
step. If the Diaphragm Chamber Pres-
sure Gauge does not indicate a drop
in pressure, re-open the Diaphragm
Chamber Supply Control Valve and
proceed to the next step.
Step 16. Slowly open the Main Control
Valve. Close the Main Drain Valve as
soon as water discharges from the
drain connection. Observe the Auto-
matic Drain Valve for leaks. If there are
leaks, determine/correct the cause of
the leakage problem. If there are no
leaks, the DV-5 Preaction Type A Valve
is ready to be placed in service and the
Main Control Valve must then be fully
opened.
NOTICE
When the Main Control Valve is
opened, the pressure on the Dia-
phragm Chamber may increase. This
increase in pressure is normal, and if
the pressure is greater than 16 bar, the
pressure is to be relieved by partially
and temporarily opening the Manual
Control Station; however, do not allow
the pressure as indicated on the Dia-
phragm Chamber Pressure Gauge to
drop below the supply pressure shown
on the Water Supply Pressure Gauge,
since this action may result in tripping
of the DV-5 Preaction Type A Valve.
After setting a fire protection system,
notify the proper authorities and advise
those responsible for monitoring pro-
prietary and/or central station alarms.
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