TFP1484
Page 15 of 16
NOTICE
Be prepared to perform Steps 2, 3, and
4 quickly if water must be prevented
from flowing beyond the riser.
Step 2. Verify that the DV-5 Preaction
Type A Valve has tripped, as indicated
by the flow of water into the system.
Step 3. Close the system’s Main
Control Valve.
Step 4. Close the Diaphragm Chamber
Supply Control Valve and the Air Supply
Control Valve.
Step 5. Reset the DV-5 Preaction Type
A Valve in accordance with the Valve
Setting Procedure.
Pressure Relief Valve
Maintenance
Over pressurization of the system
piping with air will result in the opening
of the Pressure Relief Valve. If the Relief
Valve continues to bleed air after the
system pressure has been reduced to
its normal supervisory pressure range,
most likely debris became lodged in
the seating area. Open the Pressure
Relief Valve and clean the seating area.
Internal Valve Inspection
With reference to Figure 1, once every
five years during the annual opera-
tional test procedure and prior to the
DV-5 Deluge Valve being reset, the
interior of the Deluge 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, or more frequently
if inspections and/or wear and tear
warrant more frequent replacement.)
When reinstalling the Diaphragm Cover,
complete the following steps to assure
the Diaphragm Cover Fasteners (Hex
Bolts) are uniformly and securely
tightened.
Step 1. Align Diaphragm and Dia-
phragm Cover in proper orientation
with valve body (Ref. Figure 1) and hold
in place
Step 2. Assemble Flat Washers onto
Hex Bolts
Step 3. Apply LOCTITE No. 242 (or
equivalent) to Hex Bolt threads
Step 4. Insert Hex Bolts through Dia-
phragm Cover and Diaphragm, hand-
tighten into valve body
Step 5. Using crossdraw sequence to
assure uniformity, wrench-tighten Hex
Bolts to appropriate torque values (Ref.
Table A)
Step 6. Inspect to assure all Hex Bolts
are securely tightened
NOTICE
If the water supply contains chemi-
cals which tend to attack a nylon fab-
ric-reinforced, natural rubber or the
five year inspection indicates a build-
up of debris within the Deluge Valve
that could affect its proper operation,
then the frequency of the internal valve
inspection procedure must be appro-
priately increased. If the system has
a seawater or brackish water supply,
then the frequency of the internal valve
inspection procedure must be appro-
priately increased. (An annual internal
valve inspection for a system having a
seawater or brackish water supply is
recommended.)
With reference to Figure 1, make
certain that the Diaphragm is correctly
oriented; otherwise, the DV-5 Deluge
Valve cannot be properly set.
Under-tightening the Diaphragm Cover
Bolts can result in internal and external
leakage.
The V-Ring is attached to the Dia-
phragm at the factory. If, during an
internal valve inspection, the V-Ring
is discovered to be detached from the
Diaphragm, be advised that the V-Ring
is a required valve component and that
detachment will not affect normal valve
operation or performance. Should the
V-Ring become detached, reinstall
it between the Diaphragm and Dia-
phragm Cover concentrically as shown
in Figure 1.
Note: Do not apply adhesives, lubricants,
or other substances to the Diaphragm,
V-Ring, or Valve Body.
Nominal
Valve Sizes
DN
Torque
Nm
DN40 22
DN50 29
DN80 54
DN100 65
DN150 72
DN200 87
WATER SUPPLY PRESSURE IN BAR
SYSTEM AIR PRESSURE
1,0
1,0
0
2,0
4,0 7,0 10,0 13,0
16,0
RANGE OF ACTUATOR OPENING PRESSURE
GRAPH B
AIR (NITROGEN)
MINIMUM SUPPLY PRESSURE (VdS) 3 BAR
PRESSURE REQUIREMENT
TABLE A
DIAPHRAGM COVER BOLTS
MAXIMUM TORQUE
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