Care and
Maintenance
The following procedures and inspec-
tions must be performed as indicat-
ed, in addition to any specific require-
ments of the standards recognized by
the Approval agency, and any impair-
ment must be immediately corrected.
NOTE
The frequency at which the following
procedures and inspections are to be
performed are to be in accordance
with any specific requirements of the
standards recognized by the Approval
agency.
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 recognized by the Approv-
al agency. The installing contractor or
product manufacturer should be con-
tacted relative to any questions.
It is recommended that automatic
sprinkler systems be inspected, test-
ed, and maintained by a qualified In-
spection Service in accordance with
the standards recognized by the Ap-
proval agency.
NOTE
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 prop-
er authorities and all personnel who
may be affected by this action must be
notified.
Drop In Water Supply Pressure
Below 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 subse-
quent drop in the diaphragm chamber
water pressure below its normal range
(due, for example, to a leak in a piping
connection 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-
5 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
condition) constitutes an emergency
impairment.
Should this condition occur, immedi-
ately close the stop valve and utilize
the following procedure to reset the
system:
Step 1. Prior to the water supply pres-
sure being restored to the closed stop
valve, note the pressure indicated
by the diaphragm chamber pressure
gauge and determine if 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 stop valve, reset
the Model DV-5 Deluge Valve in accor-
dance with the Valve Setting Proce-
dure 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.
Internal Valve Inspection
During the operational test proce-
dure and prior to the DV-5 Valve be-
ing reset, the interior of the DV-5 Valve
must be cleaned and inspected for
wear and damage. Damaged or worn
parts must be replaced. (Replacement
of the Diaphragm every ten years is
recommended.)
When reinstalling the Diaphragm
Cover, the Diaphragm Cover Fasten-
ers must be uniformly and secure-
ly tightened using a cross-draw
sequence. After tightening, double-
check to make certain that all of the
Diaphragm Cover Fasteners are se-
curely tightened.
NOTES
If the water supply contains chemicals
which tend to attack a Nylon fabric re-
inforced, natural rubber or the five year
inspection indicates a build-up of de-
bris within the valve that could affect its
proper operation, then the frequency
of the internal valve inspection proce-
dure must be appropriately increased.
With reference to Figure 1, make cer-
tain that the Diaphragm is correctly
oriented; otherwise, the DV-5 cannot
be properly set.
Under-tightening the Diaphragm Cov-
er Bolts can result in leakage past the
valve seat as indicated by leakage
from the Automatic Drain Valve.
Waterflow Alarm Test Procedure
To test the waterflow alarm, open the
Alarm Test Valve (G), which will allow
a flow of water to the Waterflow Switch
(C) and/or Water Motor Alarm. Upon
satisfactory completion of the test,
close the Alarm Test Valve (G).
Wet Pilot Actuation
Operation Test Procedure
Proper operation of the DV-5 Valve
(i.e., opening of the DV-5 Valve as dur-
ing a fire condition) must be verified as
follows:
Step 1. If water must be prevented
from flowing beyond the riser, perform
the following steps.
• Close the Stop Valve (B). Open the
Alarm Test Valve (G) and System
Drain Valve (E).
• Open the Stop Valve (B) one turn
beyond the position at which water
just begins to flow from the System
Drain Valve (E).
• Close the Alarm Test Valve (G) and
then close the System Drain Valve
(E).
Step 2. Open the Inspector’s Test
Connection.
NOTE
Be prepared to quickly perform Steps
3, 4, and 5, if water must be prevented
from flowing beyond the riser.
Step 3. Verify that the DV-5 Valve has
tripped, as indicated by the flow of wa-
ter into the system.
Step 4. Close the Main Control Valve
(D).
Step 5. Close the Diaphragm Supply
Valve (P).
Step 6. Reset the DV-5 Deluge Valve
in accordance with the Valve Setting
Procedure.
Dry Pilot Actuation
Operation Test Procedure
Proper operation of the DV-5 Valve
(i.e., opening of the DV-5 Valve as dur-
ing a fire condition) must be verified as
follows:
Step 1. If water must be prevented
from flowing beyond the riser, perform
the following steps.
• Close the Stop Valve (B). Open the
Alarm Test Valve (G) and System
Drain Valve (E).
• Open the Stop Valve (B) one turn
beyond the position at which water
just begins to flow from the System
Drain Valve (E).
• Close the Alarm Test Valve (G) and
then close the System Drain Valve (E).
Page 24 of 28 TFP1338
To Next Page
Loading...
