Overview of Primary Product

V5055A-F INDUSTRIAL GAS VALVES
60-2307—16 10
CAUTION
Equipment Damage Hazard.
Operation without proper checkout can damage the
equipment.
1. Do not put the system into service until you have
satisfactorily completed the following Valve Leak
Test, all applicable tests described in the Checkout
section of the Instructions for the flame safeguard
control, and any other tests required by the burner
manufacturer.
2. All tests must be performed by a trained,
experienced flame safeguard control technician.
3. Close all manual fuel shutoff valves as soon as
trouble occurs.
After the installation is complete, cycle the valve several times
with the manual fuel shutoff cock closed. Make sure the valve
and actuator function properly. Also perform the Valve Leak
Test that follows before putting the valve into service.
Valve Leak Test (Fig. 7)
This is a test for checking the closure tightness of a gas
safety shutoff valve. It should be performed by qualified
personnel during the initial startup of a burner system, or
whenever the valve or valve bonnet is replaced (see
Service Information section). It is recommended that this
test also be included in the scheduled inspection and
maintenance procedures. For a periodic inspection test,
follow steps 1, 3, 4, 5, 8, 9, 10, 12, 13, 16, and 17.
Fig. 7. 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 7. Allowable Leakage for V5055 Valves.
a
Based on natural gas at standard conditions, test pressures
provided by ANSI Z21.21, Section 2.4.2 and a maximum of
235 cc/hr (air) per inch of seal-off diameter. Seal-off diameter
is not to be confused with pipe size.
b
V5055F leakage rate is 1 bubble in 7.6 seconds.
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 V5055 valve is to be
checked for tightness of closure.
SERVICE INFORMATION
WARNING
Explosion and Electrical Shock Hazard.
Can cause serious injury, death or property
damage.
1. Before servicing, turn off the gas supply and
disconnect all electrical power to the valve actuator.
2. Only qualified service technicians should attempt
to service or repair flame safeguard controls and
burner systems.
3. Do not disassemble the valve bonnet assembly;
the valve seat is not replaceable.
4. Failure to properly position and seat the seals in the
valve body may result in a hazardous gas leak.
M9547F
GAS
SUPPLY
UPSTREAM
MANUAL
GAS COCK
DOWNSTREAM
MANUAL
GAS COCK
BURNER
DABC 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 ONLY ONE OF THE DOWNSTREAM TAPS ON THE SS0V.
1
2
3
4
4
2 3
1
1
2
(13 MM)
LEAK
TEST
TAP
V5055 Pipe
Size (in.)
Allowable
leakage
(cc/hr)
a,b
Maximum
Number of
bubbles per 10
sec.
Minimum
Number of
Seconds for
10 bubbles
3/4, 1, 1-1/4,
1-1/2
573 14 6.7
2, 2-1/2, 3 940 24 4.1
4 1254 33 3.03