Honeywell Eclipse 501212 Manual Reduced Port Butterfly Valve

Honeywell Eclipse 501212 Eclipse Butterfly Valves are designed to control air and gas flow to all types of combustion systems. They should not be used as tight shut-off valves. Manual butterfly valves 4" and smaller have an adjusting cover for setting disk position. A locking screw secures the cover at the desired setting. Manual wafer butterfly valves are adjusted by rotating a control arm which can be locked to the indicating plate after positioning.