Dungs SV 1005/604 Installationsanleitung Handbuch - Seite 5
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This leak test procedure tests the external sealing and valve
seat sealing capabilities of two SV automatic safety shutoff
valves in series. Only qualified personnel should perform this
test.
It is required that this test be done on the initial system start-
up, and then repeated at least annually. Possibly more often
depending on the application, environmental parameters, and
the requirements of the authority having jurisdiction.
SETUP
This test requires the following:
A) Test nipples installed in the downstream pressure tap
port of each automatic safety shutoff valve to make
the required 1/4" hose connection in step 4.
B) A transparent glass of water filled at least 1 inch from
the bottom.
C) A proper leak test tube. An aluminum or copper 1/4"
rigid tube with a 45˚ cut at the end that is then connected
to a 1/4" flexible hose of some convenient length pro-
vides for a more accurate leakage measurement.
However, a 45˚ cut at the end of the 1/4" flexible hose will
suffice, but it will not likely be as accurate as the rigid
tube.
D) For detecting external leakages, an all purpose liquid leak
detector solution or a soapy water solution is required.
LEAK TEST PROCEDURE
Use the illustration below as a reference.
1. With the upstream ball valve open, the downstream ball
valve closed and both valves energized, apply an all pur-
pose liquid leak detector solution to the "External Leakage
Test Areas" indicated in the illustration below, to any
accessories mounted to the safety valve, and to all gas
piping and gas components downstream the equipment
WARNING: If leakage values are
exceeded, replace valve immediately.
(see step 1)
Valve Type
SV-(DLE) 1005/1007
SV-(DLE) 1010/1012
SV-(DLE) 1015/1020
*Based on air, and test conditions per UL 429 Section 29. (Air or inert gas at a pressure of 1/4 psig and also at a pressure of one and one-half
times maximum operating pressure differential, but not less than 1/2 psig. This test shall be applied with the valve installed in its intended posi-
tion.) Volume of bubble defined in Table 2 of FCI 70-2-1998.
5 ... 6
VALVE LEAKAGE TEST
SV-(DLE): 1005, 1007
Allowable Valve Seat Leakage*
for up to 10 PSI inlet
239cc/hr
464 cc/hr
588 cc/hr
isolation valve, and the inlet and outlet gas piping for each
automatic safety shutoff valve. The presence of bubbles
indicates a leak, which needs to be rectified before
proceeding.
2. Then, de-energize the burner system and verify that both
automatic safety shutoff valves are closed.
3. Close the upstream and downstream manual ball valve.
4. Open the downstream test nipple of the upstream
valve, and connect the 1/4" flexible hose to the test nipple.
5. Slowly open the upstream manual ball valve, and then
provide for some time to allow potential leakage to charge
the test chamber before measuring the valve seat leakage.
6. Immerse the 1/4 in. tube vertically 1/2 in. (12.7 mm) below
the water surface. If bubbles emerge from the 1/4" tube
and after the leakage rate has stabilized, count the
number of bubbles appearing during a 10 second period.
(See chart below for allowable leakage rates.)
7. Repeat the procedure for the downstream automatic
safety shutoff valve except that valve #1 needs to be
opened during the leakage test.
After completing the above tests proceed as
follows:
8. Verify that the downstream manual ball valve is
closed, and both automatic safety shutoff valves are
de-energized.
9. Remove the flexible hose, and close all test nipples.
10. With the upstream manual ball valve open, energize
both automatic safety shutoff valves.
11. Use soapy water to leak test all test nipples to ensure
that there are no leaks.
12. If no leakage is detected, de-energize all automatic
safety shutoff valves, and open the downstream manual
ball valve.
NOTE: The position of the side taps #2
and #3 on the SV 1005/1007 are not the
same as on the SV 1010-1020 valves.
SV-(DLE): 1010, 1012, 1015, 1020
# of Bubbles in 10 Sec.
AIR
Natural Gas
5
6
9
11
10
12
LP
4
7
8