Patent ID: 8539978
Filing Date: 2013-09-24
Classification: F23N,Y10T

Abstract:
1. A valve unit for adjusting gas flow to a combustion apparatus, the valve unit comprising: a valve member movable relative to a valve seat in response to a signal input to a coil, for modulating two flow rates of gas flowing through the valve unit to a combustion apparatus, the valve member selectively movable to establish and regulate flow rate pressures including a first desired outlet pressure corresponding to a high-capacity gas flow rate and a second desired outlet pressure corresponding to a low-capacity gas flow rate; a first opening port; a second opening port that is smaller than the first opening port; a closure member that is movable between an open position, in which the high-capacity gas flow rate is communicated via at least the first opening port to at least one outlet, and a closed position against the first opening port, in which the low-capacity gas flow rate is communicated via only the second opening port to the at least one outlet; and a closure solenoid for selectively moving the closure member between the open position and closed position to selectively establish the high-capacity gas flow rate and/or the low capacity gas flow rate.