SOLENOID SAFETY SHUT-OFF VALVE
7
65-0246—1
OPERATION AND CHECKOUT
Operation
The V4297A Safety Shutoff Valve is a normally closed valve.
The valve opens when it is energized and closes when the
power is removed.
WARNING
Explosion Hazard and Electrical Shock Hazard.
Can cause explosion, serious injury or death.
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 technician.
3. Close all manual fuel shutoff valves immediately if
trouble occurs.
After the installation is complete, cycle the valve several times
with the manual fuel shutoff cock closed. Make sure the valve
functions properly. Also, perform the Valve Leak Test before
putting the valve into service.
Valve Leak Test (Fig. 14)
This is a test for checking the closure tightness of the gas
safety shutoff valve. It should be performed only by trained,
experienced flame safeguard control technicians during the
initial startup of the burner system or whenever the valve 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.
1.
De-energize the control system to make sure no power
goes to the valve (C, Fig. 14).
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 test tap (D).
5.
Close the downstream manual gas cock (E).
6.
Open the upstream manual gas cock (A).
7.
Run the V4297A Valve to is open position (through the
safety system); then immediately de-energize the
system to close the V4297A Valve.
8.
Immerse a 1/4 in. (6 mm) tube vertically 1/2 in. (13 mm)
into a jar of water.
9.
Slowly open the manual 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
represents a flow rate of 0.001 cfh.
IMPORTANT
To meet U.S. requirements, make sure leakage does
not exceed the rates in Table 2.
Table 2. Valve allowable leakage rate.
a
Based on air at standard conditions, test pressure provided
by ANSI Z21.21, Section 2.42 and a maximum of 235
cc/h/in of seal-off diameter (not pipe size).
Fig. 14. Valve leak test.
NOTE:
NOTE: For international leak test requirements,
contact the appropriate approval agency.
After the Test
1.
Close the upstream manual gas cock (A).
2.
Close the manual test petcock (F), remove the test
apparatus, and close the leak test tap (D).
3.
Make sure the downstream manual gas cock (E) is
closed.
4.
Open the upstream manual gas cock (A) and energize
the V4297A Valve through the safety system.
5.
Test with rich soap and water solution to make sure
there is no leak at the leak test tap (D) or any pipe
adapter/valve mating surfaces.
6.
De-energize the V4297A Valve (C).
7.
Open the downstream manual gas cock (E).
8.
Restore the system to normal operation. If two safety
shutoff valves are used, check each valve separately for
closure tightness.
V4297A
Allowable leakage
(cc/hr)
a
Number of bubbles
(per 10 sec.)
Low Capacity
235
8
High Capacity
470
16
M9547D
GAS
SUPPLY
UPSTREAM
MANUAL
GAS COCK
DOWNSTREAM
MANUAL
GAS COCK
BURNER
D
LEAK
TEST
TAP
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.
ONLY USE ONE OF THE DOWNSTREAM TAPS ON THE 550V.
1
2
3
4
4
2
3
1
1
2
(13 MM)