| 摘要 |
A pressure relief vent for a pressure vessel such as an over the road tank trailer including a poppet forced into sealing engagement with a valve seat by a compression spring which maintains the poppet in sealing engagement with the valve seat to a set pressure and which poppet upon the occurrence of pressurized fluid in the trailer tank sufficiently in excess of the set pressure lifts the poppet up off of the valve seat a distance sufficient to permit the over-pressurized fluid to flow out of the vent at the flow rate, the outer peripheral portion of the poppet is provided with outwardly curved and downwardly extending portions which form the escaping over-pressurized fluid into a jet stream which provides reaction force which assists the pressurized fluid in maintaining the poppet lifted off of the valve seat to provide the flow rate and which permits the use of a stiffer and therefore shorter compression spring enabling the pressure relief vent to be shorter in height while maintaining the required flow rate.
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