Design features and benefits of 3065 North American aspirators and gas mixers
3065 ASPIRATOR AIR/GAS MIXER FEATURES
3065 Aspirator Mixers are used to create a uniform air / fuel mixture to feed premix burner nozzles. Energy from blower air passing through the 3065 venturi creates suction, which entrains a proportional flow of gas at atmospheric (zero gauge) pressure. Multiple premix burner nozzles fed by a 3065 can be controlled by a single manual or motorized air valve. Proper air/fuel ratio is initially set by adjusting the integral V-port* valve built into the mixer. The ratio is maintained from high fire to low by an “atmospheric regulator” (zero governor) or by cross connecting the regulator (e.g., North American’s 7218).
— Mixes air with any fuel gas from 500 to 3,200 Btu/ft3 HHV — Over 200 size combinations to fit most applications
— 3/4" to 8" air inlet & premix outlet — Efficient design with low pressure loss
— Suitable for single or multiple premix nozzles — Rugged cast iron construction* for long life — Compact construction for easy installation — Mount in any position — Interchangeable displacement rods for optimum mixture pressure and suction ratio. — Rods can be changed without breaking air or gas piping — Built in gas adjustment valve cartridge* — Gas adjustment cartridge & gas inlet are interchangeable*
For coke oven, manufactured, and other gases corrosive to brass, specify 3065- -K Mixer with iron/steel parts in place of brass.
For an observation port in place of a -0 plug (no rod) specify 3065- -0-OBS (3065-1 to -8 sizes).
Rated Air Flow of each 3065 without rod (scfh)
Air P. (osi) "w.c. (4) 6.9
(8) 13.8 (12) 20.8
(16) 27.7
AIR INLET
Mixer .P. "w.c. Mixture P. "w.c.
4.92
9.84
14.76
19.7
2
4
6
8
3065-0-0 3065-1-0 3065-2-0 3065-3-0 3065-3-S0 3065-4-0 3065-4-S0 3065-5-0 3065-5-S0 3065-6-0 3065-6-S0 3065-7-0 3065-7-S0 3065-8-0 3065-8-S0 3065-9-0
480 650 1220 1850 2740 3200 3960 4440 6420 6640
680 930
830 1130 2120 3210 4750 5550 6860 7700 11 110 11 510
960 1310
BURNER AIR VALVE
1730 2620 3870 4530 5600 6280 9070 9400
2450 3710 5480 6410 7930 8890
DISPLACEMENT ROD
BURNER
GAS INLET
12 800 13 300 21 900 26 400 45 400 68 300 103 500 138 000
V-PORT VALVE
10 950 13 200 22 700 34 100 51 700 68 800
15 500 18 700 32 100 48 200 73 200 97 300
19 000 22 900 39 300 59 100 89 600 119 000
ASPIRATOR MIXER
ATMOSPHERIC REGULATOR
Figure 1. Typical arrangement of 3065 Aspirator Mixer with burner, atmospheric regulator, and air valve.
*3065-9 Mixers have fabricated steel construction and a separate 1127-7-F limiting orifice butterfly valve in the gas line upstream of the mixer.
See Sheet 3065-M for tables in SI units
Bulletin 3065 page 2
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