60-2080—9 G.R. Rev.09-02
www.honeywell.com
V48A,F,J; V88A,J DIAPHRAGM GAS VALVES
Automation and Control Solutions
Honeywell International Inc.
Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North
35 Dynamic Drive
Golden Valley, MN 55422
Scarborough, Ontario
M1V 4Z9
Fig. 16. Valve leak test.
1.
De-energize the control system to assure that there is
no power to the safety shutoff valve (
C
) shown in Fig. 7.
2.
Close the upstream manual gas cock (
A
).
3.
Make sure the manual test petcock (
F
) is closed in the
leak test tap assembly (
D
).
4.
Remove the leak test tap plug and connect the test
apparatus to the Leak Tap (
D
).
5.
Close the downstream manual gas cock (
E
).
6.
Open the upstream manual gas cock (
A
).
7.
Run the safety shutoff valve (
C
) to its fully open position
(through the safety system); then immediately
de-energize the system to close the valve.
8.
Immerse a 1/4 in. tube vertically 1/2 in. (12.7 mm) into
a jar of water.
9.
Slowly open the test petcock (
F
).
10.
When the rate of bubbles coming through the water
stabilizes, count the number of bubbles appearing
during a ten-second period. Each bubble appearing
during a ten-second period represents a flow rate of
approximately 0.001 cfh.
To meet U.S. requirements, leakage must not exceed the
values listed in Table 5.
Table 5. Allowable Leakage for V48/V88 Valves.
a
Natural gas: multiply air by 1.25.
b
Bubble leakage: Divide natural gas by 573, then multiply by
14.
NOTE: For international leak test requirements, contact
the office of the appropriate approval agency.
After the test:
11.
Close the upstream manual gas cock (
A
).
12.
Close the test petcock (
F
), remove the test apparatus,
and replace the leak test tap plug (
D
).
13.
Open the upstream manual gas cock (
A
) and energize
the safety shutoff valve (
C
).
14.
Test with soap bubbles to assure that there is no leak
at the test tap (
D
).
15.
De-energize the safety shutoff valve (
C
).
16.
Open the downstream manual gas cock (
E
).
17.
Restore the system to normal operation. If two safety
shutoff valves are utilized, each V48/V88 valve is to be
checked for tightness of closure.
M9547F
GAS
SUPPLY
UPSTREAM
MANUAL
GAS COCK
DOWNSTREAM
MANUAL
GAS COCK
BURNER
D
A
B
C
E
F
PRV
MANUAL
TEST
PETCOCK
SSOV
1/4 IN. (6 MM)
FLEXIBLE
TUBING
1/4 IN. (6 MM)
ALUMINUM OR
COPPER PILOT
TUBING
JAR OR GLASS
WITH WATER
CUT AT
45 DEGREE
ANGLE
CAN ALSO BE A PERMANENT PETCOCK.
PRV = PRESSURE REGULATING VALVE.
SSOV = SAFETY SHUTOFF VALVE.
USE THE DOWNSTREAM TAP ON THE SS0V.
1
2
3
4
4
2
3
1
1
2
(13 MM)
LEAK
TEST
TAP
V48/V88
Pipe Size
(in.)
Air (cc/h)
Natural Gas (
cc/h)
a
Bubbles/10
sec.; Max @
45 degrees
b
3/4
266
332.5
8
1
302
377.5
9
1-1/4
442
552.5
13
1-1/2
442
552.5
13
2
650
812.5
20
2-1/2
650
812.5
20
3
650
812.5
20