| 摘要 |
This specification discloses a fluid flow fuse, including some modified constructions, with a valve element that moves between open and closed positions without the use of any close fitting guide for the valve element. The valve element is loose in the passage that it controls so that when the valve element remains continuously in open position for long periods of time, contamination deposits that accumulate in the passage (particularly in water passages) do not stick the valve element to a guide so that it can not operate when fluid flow in the passage reaches a velocity at which the fuse was originally designed to close. Abutments with which the valve element contacts when yieldably held in open position have line contact, or small areas of contact with the valve element, so that the valve element can not become firmly stuck to its limit stops.
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