Design features and benefi ts of 3065 North American aspirators and gas
mixers
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 fl ow 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 fi re to low by an “atmospheric regulator” (zero governor) or
by cross connecting the regulator (e.g., North American’s 7218).
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).
3065 ASPIRATOR AIR/GAS MIXER FEATURES
—
Mixes air with any fuel gas from 500 to 3,200 Btu/ft 3 HHV
—
Over 200 size combinations to fi t most applications
—
3/4" to 8" air inlet
&
premix outlet
—
Effi
cient 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*
AIR INLET
BURNER AIR VALVE
GAS
INLET
V-PORT VALVE
ASPIRATOR MIXER
DISPLACEMENT
ROD
BURNER
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 orifi ce butterfl y valve in the gas line upstream of the mixer.
Rated Air Flow of each 3065 without rod (scfh)
Air P. (osi)
4
8
12
16
Mixer D.P. ("wc)
4.9
9.8
14.8
19.7
Mixture P. ("wc)
2
4
6
8
3065-0-0
480
680
830
960
3065-1-0
650
930
1130
1310
3065-2-0
1220
1730
2120
2450
3065-3-0
1850
2620
3210
3710
3065-3-S0
2740
3870
4750
5480
3065-4-0
3200
4530
5550
6410
3065-4-S0
3960
5600
6860
7930
3065-5-0
4440
6280
7700
8890
3065-5-S0
6420
9070
11110
12800
3065-6-0
6640
9400
11510
13300
3065-6-S0
10950
15500
19000
21900
3065-7-0
13200
18700
22900
26400
3065-8-0
34100 48200
59100
68300
3065-8-S0
51700
73200
89600
103500
3065-9-0
65800 97300
1119000 138000
Bulletin 3065
page 2
