TECHNICAL DATA
March 28, 2013
Dry 120j
DRY VALVE
MODEL F-1
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
Telephone: 269-945-9501 Technical Services: 877-384-5464 Fax: 269-818-1680 Email: techsvcs@vikingcorp.com
tion in the housing (1).
iv. Install the hand-hole cover bolts (21) finger tight only.
v. Cross-tighten all hand-hole cover bolts (21), to 90 ft. lbs. of torque to evenly compress the diaphragm (12) and
maintain proper alignment of the member sub-assembly (5-15 & 17-19, 21, 25).
7. AVAILABILITY
The Viking Model F-1 Dry Pipe Valve is available through a network of domestic and international distributors. See the Viking Corp.
Web site for closest distributor or contact The Viking Corporation.
8. GUARANTEES
For details of warranty, refer to Viking’s current list price schedule or contact Viking directly.
Table 3 - Troubleshooting Guide
Condition: Possible causes: Suggested action:
The valve trips when no sprin-
kler has fused
Loss of air pressure in the system
Check the system for leaks and check for proper air supply. A Viking Air
Maintenance Device should be installed on each system equipped with
an automatic air supply. Consider adding a maintenance air compres-
sor.
An extreme pressure surge in the
water supply
Increase the air pressure on the system. The maximum limit is 60 PSI
(4.1 bar). Note: Increasing system pressure may increase trip time of
the dry valve.
Water constantly passing
through the drip check when
the valve is in the SET posi-
tion
Water leaking over the water seat
into the intermediate chamber
Inspect and clean the water seat and clapper rubber (see paragraph 4-B
Placing the Valve in Service). Consider replacing the clapper rubber. If
the water seat has been pitted or damaged by debris, it may be neces-
sary to replace the base assembly.
Alarm test valve in the bypass con-
nection of the dry valve trim not tight-
ly closed
Verify that water is not getting past alarm test valve.
Air constantly passing through
the drip check when the valve
is in the SET position
Air leaking over the air seat into the
intermediate chamber
Inspect and clean the air seat and clapper rubber (see paragraph 4-B
Placing the Valve in Service). Consider replacing the clapper rubber. If
the air seat has been pitted or damaged by debris, it may be necessary
to replace the air plate assembly.
Air leaking past the rubber dia-
phragm
Inspect the rubber diaphragm for deterioration. If necessary, replace the
diaphragm.
Clapper will not latch
Incorrect resetting tool
Verify that the re-setting tool used is smooth and of the proper strength
and diameter* to provide the required force at the appropriate angle to
cause the latching hook to slide over the clapper arm when setting the
dry valve.
* The Viking re-setting tool is a 3/4” (19 mm) diameter cold rolled steel
bar, chamfered at one end and a standard 15/16” hex-socket on other
end (PN 02977BM).
The hook not sliding on the re-setting
tool
File or grind the re-setting tool. Remove any rough spots to provide a
smooth sliding surface and proper clearance.
Clapper rubber worn Replace the clapper rubber.
Internal parts damaged by accidental
application of high pressure
Replace the valve member assembly.
The valve latches but will not
remain set
Improper resetting procedure See paragraph 4-B Placing the Valve in Service.
Inadequate air supply See paragraph 4-B Placing the Valve in Service.
Air pressure and priming water pass-
ing through the intermediate cham-
ber and out of the drip check
Clean the air seat and the clapper rubber. Replace the clapper rubber,
if worn.
(44 pages)
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