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Butterfl y Valves

Butterfl y Valves
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North American Butterfly Valves Bulletin 1123/24/26 1124 and 1126 Motor Operated and 1123 Manual Air capacities listed below (wide open and 70° open) are under full flow conditions: The valve installed in a pipe run of the same size as the valve with a pipe velocity of 70 ft/sec. Butterfly valves have no appreciable pressure drop when wide open in full size pipe, handling flows and velocities of normal combustion systems. Therefore, capacity ratings usually are not a factor when selecting manual valves for individual burners or systems. VALVE CAPACITIES Butterfly valve capacities (see box above) scfh air at 1"w.c. pressure drop (70°F air; 6 osig upstream pressure)* Valve Cy Valve Pipe size wide 70° (70° designation inches open open open) If valve flow control characteristics are important, valve sizing should take into consideration: — total cfh required at high and low fire; — available air pressure drop; — piping configuration between control valve and burners; — effect of the ratio of pressure drops in the complete system vs. those through the control valve. Where a motorized butterfly control valve serves a group of burners, system pressure drops determined by pipe size, lengths, fittings, etc. affect valve size selection in critical applications. One "rule of thumb" for combustion systems, has been to size valve (70° open) for pressure drop equal to 1/5 - 1/6 of total drop in system including, of course, drop across burners. Change in flow and pressure drop across the valve is negligible when changing from 70° open to wide open unless inlet pressure is increased substantially to maintain the 1"w.c. pressure drop. TORQUE. Torques required to operate Butterfly Valves with 3 psi inlet pressure are: * See page 2 for air temperature correction factors.

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STANDARD VALVES (See also Bulletins 1122 [Manual], and 1154 [Resilient Seat Wafer]) 1124 Motorized 1126 Motorized 1126 (H) Hot Air Motorized 1123 Manual Standard butterfly valves have female pipe threads in %" through 6" pipe sizes; larger valves are flanged®, as are 1126-F in 3", 4", and 6" sizes. Motorized valves can be ordered with bracket, motor arm, and linkage for standard control motor or actuator. 1123 Manual valves have a locking handle and are available in 8" to 16" sizes. 1122 manual valves have a locking handle and are available in %" to 6" sizes. 1126 and 1123 Valves have a...

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STANDARD VALVES (dimensions apply also to "G" valves) Valve designation A-Pipe size Bolt holes on all flanged models are equally spaced and straddle valve centerlines. ORDER MUST SPECIFY: 1)Valve designation (for all valves). 2)Motor selected (for 1124 and 2) 1126 Valves). dimensio ns in inchesl G H J J Minimum valve arm radius for attaching linkage is U, maximum is 5".

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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. WARNING: Situations dangerous to personnel and property may exist with the operation and maintenance of any combustion equipment. The presence of fuels, oxidants, hot and cold combustion products, hot surfaces, electrical power in control and ignition circuits, etc., are inherent with any combustion application. Components in combustion systems may exceed 160°F (71°C) surface temperatures and present...

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