| 摘要 |
A fluid flow regulating or shut-off valve of the kind having a bimetallic element which regulates or opens and closes a flow passage through the valve in dependence upon temperature is provided with at least one electrically heatable PTC-element which is in thermal contact with the bimetallic element. Heating of the PTC-element by control of the supply of electricity to it thus controls the operation of the valve. The bimetallic element is preferably in the form of a snap-acting bending bimetallic plate which is heated by radiation from the PTC-element and which itself forms the valve closure member. With the bimetallic plate snapped in one direction, a passage through the valve is opened, but when the plate snaps in the other direction, it bears against a sealing ring surrounding a valve opening within the valve to close and seal the opening and thus shut the valve.
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