Max Set Gas Valve-1001 is used to set air/gas ratio on a nozzle-mix burner. It has a V-port plug that can be adjusted sensitively and accurately with a screwdriver. Turning the screw counterclockwise increases flow. A cap conceals the adjustment and discourages tampering with the setting. If an adjustment is needed, replace top cap on valve body to reduce air or gas leaks.

The V-port adjustment is in a removable gas cartridge assembly, simplifying inspection or replacement. Max set gas valves have brass internals; 1001-K Valves have iron internals for coke gas and others corrosive to brass; 1001-TK Valves are for hot gases.