| 摘要 |
A snap-action permanently indicating pressure relief valve is disclosed. The valve includes a valve member defining a flow path having an area less than the area of an inlet wherein the inlet pressure initially acts over a portion of a pressure surface of the valve member equal to the inlet area and subsequently acts over the entire area of the pressure surface to suddenly increase the velocity of the valve member. The valve member smacks and permanently deforms a deformable over pressure indicating element to give permanent indication of an over pressure condition.
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