Tyco DV-5A Manual page 15

Internal Valve Inspection
Once every five years during the annual
operational test procedure and prior
to the DV-5 Valve being reset and
a
with the DV-5 Valve de-pressurized,
a
the interior of the DV-5
a
be cleaned and inspected for wear
and damage. Damaged or worn parts
must be replaced. (Replacement of the
Diaphragm every ten years is recom-
mended, or more frequently if inspec-
tions and/or wear and tear warrant
more frequent replacement.)
NOTICE
The Diaphragm Cover may be removed
between Steps 4 and 5 of the reset-
ting instructions, since at that point the
DV-5 Valve should be de-pressurized
a
as evident by a zero gauge reading on
the Diaphragm Gauge (K) and Water
Supply Gauge (J), as well as no water
discharging from the Automatic Drain
Valve (F).
To perform internal valve inspection
between Steps 4 and 5 of the Valve
Setting Procedure, remove the dia-
phragm cover as follows:
Step 1. Remove the Copper Tube
Fitting between the Diaphragm Supply
(P) and the System Main Control Valve
(B).
Step 2. Loosen the union securing the
Solenoid Valve (N).
Step 3. Loosen and remove the union
between the Diaphragm Cover and the
trim and remove the trim.
Step 4. Remove the Diaphragm Valve
Cover hardware, then slowly remove
the Diaphragm Cover and perform
internal valve inspection. Clean the
valve interior and replace parts as
necessary.
After cleaning and inspecting valve
interior, and replacing parts as nec-
essary, reinstall the Diaphragm Cover
by completing the following steps to
assure the Diaphragm Cover Fasteners
are uniformly and securely tightened.
Step 1. With reference to Figure 1,
ensure that the Diaphragm is properly
oriented and that the proper hardware
arrangement is utilized when assem-
bling the Diaphragm Covers. The hard-
ware arrangements differ depending on
the size of the DV-5 Valve.
a
Step 2. By first using the Long Hex
Bolts, support of the Diaphragm Cover
will be provided before installing the
Short Hex Bolts. Align Diaphragm in
proper orientation with Valve Body, and
Valve must
then align Diaphragm Cover in proper
orientation with Valve Body. Hand-
tighten all fasteners.
Step 3. Using crossdraw sequence
to assure uniformity, wrench-tighten
Long Hex Bolts and Short Hex Bolts
to appropriate torque values. Repeat
crossdraw sequence two to three
times at incremental torque valves
until reaching the torque valves found
in Table B.
Step 4. Inspect to assure all Hex Bolts
are securely tightened.
Step 5. Using the union, the trim to the
Diaphragm Cover.
Step 6. Using the union, secure the
solenoid Valve (N).
Step 7. Replace the Copper Tube
Fitting between the Diaphragm Supply
Valve (P) and the System Main Control
Valve (B).
Step 8. Ensure that the unions and flare
fittings are securely tightened.
Step 9. Proceed to step 5 of the Valve
Setting Procedures section in this data
sheet.
NOTICE
If the water supply contains chemicals
which tend to attack a polyester fabric-
reinforced, EPDM rubber or the five
year inspection indicates a build-up of
debris within the DV-5
affect its proper operation, then the
frequency of the internal valve inspec-
tion procedure must be appropriately
increased.
With reference to Figure 1, make
certain that the Diaphragm is correctly
oriented; otherwise, the DV-5
cannot be properly set.
Under-tightening the Diaphragm Cover
Bolts can result in internal and external
leakage.
Use only TYCO replacement fasteners
as specified in Figure 1.
Do not apply adhesives, lubricants, or
other substances to the Diaphragm or
Valve Body.
Valve Sizes
DIAPHRAGM COVER BOLTS
Valve that could
A
Valve
A
TFP1325
Page 15 of 20
Torque
lb-ft
Nominal
(N∙m)
ANSI
Short
Inches
Nuts Hex
(DN)
Bolts
1-1/2 44
(40) (59,7) (47,5)
2 44
(50) (59,7) (47,5)
3 188 150
(80) (254,9) (203,4)
4 396
(100) (536,9) (428,4)
6 265
(150) (359,3) (287,4)
8 545 436
(200) (738,9) (591,1)
TABLE B
MINIMUM TORQUE
35
35
316
212