Set Components | 4011/4021 Pilot
4011 SET COMPONENTS 4031 PILOT MIXER
1⁄8" NPT air pressure tap
1⁄8" NPT mixture pressure tap
¾" NPT(F) air inlet
C
¾" NPT(F) premix outlet
A
B
Gas Adjustment Screw
E
3⁄8" NPT(F) gas inlet
locknut
D
4031 mixers create uniform air/gas premix for reliable pilot operation. A precision built-in needle valve (which is lockable) sets the desired gas flow rate at pressures between zero and 24 osi (42"w.c.). The inlet air tap or the mixture pressure tap can be cross connected to a pilot gas regulator (purchased separately) so that the pilot’s air/fuel ratio will not be affected by changes in back pressure at the pilot tip. The pressure at the pilot gas regulator inlet should be at least 2 osi (3.5"w.c.) greater than the connected pilot air or mixture pressure. The differential pressure between the two pressure taps can be used to meter the flow through the mixer. 1"w.c. of pres- sure drop provides 73 scfh of air flow, see Chart 1A in the 3065 bulletin.
4031 Dimensions in inches (mm)
A
B
C
D
E
Wt., lb (kg)
2.47 (63)
1.75 (44)
1.50 (38)
5.75 (146)
3.81 (97)
1.69 (.77)
For additional information see Sheet 4031
GAS VALVES
E
A - NPT
D
AIR VALVES
B
Closed
C
A– NPT(F) E
80°
The 1821B-02 Ball Valve is a manual gas shut-off valve. Use the gas adjustment screw on the 4031 mixer to set the gas rate. The 1821B valve is only used for manual shut-off. See bulletin 1821B for more details.
B
Open
D C C
F
G
H
The 1122-0 Air Butterfly Valve sets pilot air firing rate with a lock- able handle to prevent the accidental changing of valve setting. The knurled knob can be used to lock the position by hand or a socket head cap screw (provided in the knob) can secure the handle position with a 5⁄32 " hex wrench to discourage tampering. See bulletin 1122 for more details.
1821B-02 Dimensions in inches (mm)
A
B
C
D
E
Wt., lb (kg)
0.87
1.73 (44)
1.69 (43)
3.35 (85)
0.30 (0.14)
3/8
(22)
1122-0 Dimensions in inches (mm)
A B
C D
E
F
G
H Wt, lb. (Kg)
2.06 1.19 2.38 3.00 2.75 1.19 3.94 (52) (30) (60) (76) (70) (30) (100)
2.00 (0.9)
3/4
Bulletin 4011/4021 Page 4
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