Care And Maintenance - Tyco DV-1 Manual

Page 18 of 20
noid Valve, Dry Pilot Actuator, and
Alarm Devices, as applicable. Any
leaks must be corrected before pro-
ceeding to the next step.
Step 11. 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-1 Valve is ready to be
placed in service and the Main Control
Valve must then be fully opened.
NOTE
After setting a fire protection system,
notify the proper authorities and ad-
vise those responsible for monitoring
proprietary and/or central station
alarms.
Care and
Maintenance
The following procedures and inspec-
tions should be performed as indi-
cated, in addition to any specific re-
quirements of the NFPA, and any
impairment must be immediately cor-
rected.
The owner is responsible for the in-
spection, testing, and maintenance of
their fire protection system and de-
vices in compliance with this docu-
ment, as well as with the applicable
standards of the National Fire Protec-
tion Association (e.g., NFPA 25), in
addition to the standards of any
authority having jurisdiction. The in-
stalling contractor or product manufac-
turer should be contacted relative to
any questions.
It is recommended that automatic
sprinkler systems be inspected,
tested, and maintained by a qualified
Inspection Service.
NOTES
Some of the procedures outlined in
this section 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.
Before closing a fire protection system
main control valve for maintenance
work on the fire protection system that
it controls, permission to shut down the
affected fire protection systems must
first be obtained from the proper
authorities and all personnel who may
be affected by this action must be no-
tified.
Drop In Water Supply Pressure Be-
low Normal Range
NOTE
If the water supply pressure is signifi-
cantly reduced below the normally ex-
pected static pressure range (as could
occur in the case of a water main break
or repair), and there is a subsequent
drop in the diaphragm chamber water
pressure below its normal range (due,
for example, to a leak in a piping con-
nection to or from the diaphragm
chamber or, a leak in the diaphragm
chamber check valve caused by dirt or
debris in the check valve seal area), a
deluge valve such as the Model DV-1
could inadvertently trip, if its water
supply pressure is quickly restored.
A drop in the water supply pressure to
below its normal range (as in the case
of an interrupted water supply condi-
tion) constitutes an emergency impair-
ment as defined by NFPA 25. Should
this condition occur, immediately
close the main control valve and util-
ize the following procedure to reset the
system:
Step 1. Prior to the water supply pres-
sure being restored to the closed main
control valve, note the pressure indi-
cated by the diaphragm chamber pres-
sure gauge and, whether the pressure
is within the normally expected range.
Step 2. If the diaphragm chamber
pressure is below the normal range,
check for and correct any source of
leakage from the diaphragm chamber,
prior to resetting the system.
Step 3. After the water supply pres-
sure is restored to the main control
valve, reset the Model DV-1 Deluge
Valve in accordance with the Valve
Setting Procedure section.
NOTE
For fire protection systems subject to
an emergency impairment caused by
an interrupted water supply condition,
it is recommended that consideration
be given to installing a low water sup-
ply pressure switch, with the appropri-
ate alarm/indications, to monitor the
water supply pressure
Annual Operation Test Procedure
Proper operation of the DV-1 Valve
(i.e., opening of the DV-1 Valve as
during a fire condition) should be veri-
fied 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. Determine the type of actua-
tion/detection system, and operate the
DV-1 Valve accordingly.
NOTE
Be prepared to quickly perform Steps
3, 4, and 5, if water must be prevented
from flowing beyond the riser.
• Wet Pilot Actuation — Open the
Inspector's Test Connection.
• Dry Pilot Actuation — Open the
Inspector's Test Connection.
• Electric Actuation — Test the del-
uge releasing panel (automatic con-
trol unit) in accordance with the
manufacturer's instructions to ener-
gize the solenoid valve.
Step 3. Verify that the DV-1 Valve has
tripped, as indicated by the flow of
water into the system.
Step 4. Close the Diaphragm Cham-
ber Supply Control Valve.
Step 5. Close the system's Main Con-
trol Valve.
Step 6. Reset the DV-1 Deluge Valve
in accordance with the Valve Setting
Procedure.
Five Year Internal Valve Inspection
Once every five years during the an-
nual operational test procedure and
prior to the DV-1 Valve being reset, the
internal parts of the DV-1 Valve should
be cleaned and then inspected for
wear and damage. Make certain that
the two 1/8 inch (3,2mm) diameter
pressure equalizing vents in the top of
the Clapper are open. Special consid-
eration should be given to the condi-
tion of the Diaphragm and the Clapper
Facing. The Diaphragm and/or Clap-
per Facing should be replaced if there
are any signs of deterioration due to
age or chemicals in the water.
NOTE
If the water supply contains chemicals
which tend to attack an EPDM type
rubber or the five year inspection indi-
cates a build-up of debris within the
valve which could affect its proper op-
eration, then the frequency of the inter-
nal valve inspection procedure should
be increased as appropriate.
Worn or damaged parts must be re-
placed and the DV-1 Valve must be
reassembled in accordance with Fig-
ure 1. The Cap Screws securing the
Diaphragm and Handhole Covers
should be uniformly tightened using a
cross-draw sequence.
TFP1330