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Limiting Orifi ce Gas Valves

Limiting Orifi ce Gas Valves
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North American Limiting Oriﬁce Gas Valves An 1807 Limiting Orifice Valve 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 an Allen wrench. Turning the screw counterclockwise increases flow. A cap conceals the adjustment and discourages tampering with the setting. After adjustment always 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. 1807 Valves have brass internals; 1807- -K Valves have iron internals for coke gas and others corrosive to brass; 1807- -TK Valves are for hot gases. Valves with the pre-fix "M" have ISO 7 Rp threaded end connections. 1807 Limiting Orifice Valves provide "fine tuning" for air/gas ratio adjustment. Limiting Orifice Valves are not designed for shutting off gas. Use an approved ball valve, plug valve or cock. TWO TYPICAL PIPING ARRANGEMENTS FOR LIMITING ORIFICE VALVES SINGLE BURNER MULTIPLE BURNER Nozzle Mixing Burner Motor Operated Valve 1807 Limiting Orifice Valve Nozzle Mixing Burner Nozzle Mixing Burner 1807 Limiting Orifice Valves Gas/Air Ratio Regulator Metering Orifice Install 1807 Valve as close as possible to burner. Normal practice is to select limiting orifice valve pipe size same as ratio regulator (North American #7218 or #7216), or as burner gas connection if several burners are fed by one regulator. There is no performance advantage in using the smallest possible 1807 for the flow and pressure drop available.

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CAPACITIES scfh Natural Gas (0.6 s.g.) Capacity Valve designation and pipe size Capacities shown with 1 psi (70 mbar) inlet pressure. Maximum Pressure: 25 psig (1.7 bar) 1807 Pressure and Temperature Ratings Valve Max Inlet Min. Max. Designation Pressure Temp. Temp. Specific Capacity Gravity Factor Valve designation DIMENSIONS SHOWN ARE SUBJECT TO CHANGE. PLEASE OBTAIN CERTIFIED PRINTS FROM FIVES NORTH AMERICAN COMBUSTION, INC. IF SPACE LIMITATIONS OR OTHER CONSIDERATIONS MAKE EXACT DIMENSION(S) CRITICAL. * Valves purchased before 2017 use standard US Allen wrench...

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1807 and 1807- -K (All Iron Valve) PARTS LIST1807-01 1807-0 1807-1 Part Name 1807-01-K 1807-0-K 1807-1-K © Recommended spare part. © Included in Gas Cartridge Assembly, or can be ordered separately. To order complete valve: Blank = Imperial (NTP ends)_ Options Blank = Standard C = Cleaned for Oxygen H = High pressure K = Iron internals TK= Iron internals, high temperature Example: 1807-01-TK % high temperature limiting orifice valve with iron internals. TO ORDER PARTS, SPECIFY: Part number, part name, and valve designation Example: 4-6063-2 Gas Cartridge Assembly for 1807-2...

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