| 摘要 |
<p>Tandem shut-off valve (18, 22) and modulating valve (19, 27) are operated together by a solenoid (16). Movement of the valves is opposed by a spring (25) providing a resistance to movement of the valves which increases as the valves open. Power is supplied to the solenoid by an interface unit (11), which varies the power by a phase-clipping system or by voltage variation or by cyclic switching to vary the movement of the solenoid armature and thereby the valve opening. The valves supply gas to a cooker oven the temperature of which is sensed and fed back to the interface, whereby the valve opening is adjusted to attain and maintain a desired cooking temperature. <IMAGE></p> |
