Abstract: A gas valve for controlling the flow of gas to a burner. An actuator controls the flow of gas through the valve. A stepper motor operates the actuator. A first temperature sensor senses temperature of gas entering the valve. A second temperature sensor senses temperature of gas leaving the valve. A controller controls the stepper motor in response to the sensed temperatures. This gas valve provides universal single-stage, multi-stage and modulating gas flow control for appliances and furnaces.

Abstract: A toy vehicle having collectors thereon which are adapted to contact conductive strip's along a track is adapted to move at a substantially constant speed and provided with first and second guide means projecting laterally with respect to the vehicle body at spaced locations thereon. Each guide means terminates in a free end projecting downwardly for entry into a groove. Said guide means and groove cooperate to guide the vehicle around turns in the track. The guide means free ends and the grooves have a width differential which is less the width differential between each collector and its conductive strip. The guide means are mounted so that they may be mounted to project to one or to the other side of the vehicle.