| 摘要 |
<p>A thermally responsive, electrically actuated valve assembly comprising a generally cylindrical capsule having an inlet port in one face thereof and an outlet port in its other face with communication between ports, with one of the ports having a valve seat. Valve means within the capsule are movable into and out of engagement with the valve seat, thereby selectively to block communication between ports, the valve means comprising a generally circular, dish-shaped snap-acting thermostatic disk responsive to a variation in temperature to abruptly change its curvature between a first position in which the disk is bowed toward the seat and the valve means are closed against the seat thereby to block communication between the ports and a second position in which the disk is bowed away from the seat and the valve means are spaced therefrom thereby to open communication between the ports. Spring means bias the disk and the valve means toward the seat when the disk is in its first position thereby to apply sufficient force thereto thereby to maintain the valve means closed against the seat. An electric heater is secured to one face of the capsule in heat-exchange relationship with the disk whereby when electrically energized, it will heat the disk to a temperature at which the disk will reverse curvature from one position to another. An abutment is provided within the capsule against which the disk reacts as it snaps over center from its first to its second position.</p> |
