3/4" 4000 Series Pilot Mixer Identification
Bulletin 3065 page 20
For more information see the following product bulletins: — Bulletin 4011/4021 — Sheet 4031-1 4031 ¾ " pilot mixer, it has the following characteristics: — ¾ " NPT air inlet labeled "AIR" — ¾ " NPT premix outlet labeled with an arrow showing flow direction — 3⁄8 " NPT gas inlet labeled "GAS" — 1⁄8 " NPT pressure taps for air inlet and outlet premix pressures — A slotted screw and locking nut for gas adjustment — The classic round NA logo with a flame — The text "PILOT MIXER" and "4-6131" — The 4-6131 number is a casting identification number The 4031 is the most popular North American pilot mixer, and is suitable for use with all North American ¾ " premix pilot tips when cross-connected to a pilot regulator like the 7350.
Pilot mixers are small aspirator mixers used to supply an air/gas premix to a burner pilot. Multiple pilots tips are sometimes feed from a single 3065 aspirator mixer, but it is more common and reliable to feed small 3/4" pilot tips with a single small 3065 or a 4000 series pilot mixer.
The mixers below are obsolete and can be replaced with the 4031
4035-01 / 4031V-01 ¾ " pilot mixer: — ½ " NPT air inlet labeled "AIR" — ½ " NPT premix outlet labeled with an arrow showing flow direction — 3⁄8 " NPT gas inlet labeled "GAS" — A red rectangle tag with the text "4035" and "PILOT MIXER" — On one side the text "NORTH AMERICAN MFG. CO." — On the other side the text "CLEVELAND OHIO" — The casting identification part number "4-3337" — The "4035V-01" type has a screw to adjust gas flow 4035-02 / 4035V-02 / 152 / 153 ½ " pilot mixer: — 3⁄8 " NPT air inet labeled "AIR" — ½ " NPT premix outlet labeled with and arrow showing flow direction — ¼ " NPT gas inlet labeled "GAS" — On one side the text "NORTH AMERICAN MFG. CO." — On the other side the text "CLEVE OHIO" — The "4035V-02" type has a screw to adjust gas flow — The casting identification part number "4-2729"
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CONTACT fna.sales@fivesgroup.com T +1 800 626 3477 - F +1 216 373 4237
Fives North American Combustion, Inc. 4455 East 71st Street - Cleveland, OH 44105 - USA www.fivesgroup.com
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