Pressure safety valve
AssigneeConsolidated Brass Company
InventorJames W. Dashner
Life of this patent
Estimating the term…
Abstract
A safety valve for use in gaseous service at elevated temperatures, including a casing provided with an annular valve seat and a selectively moveable valve member having mounted thereon a plastic annular sealing ring for seating on the valve seat. The plastic annular sealing ring is preferably formed of Teflon P.F.A. fluorocarbon and is shrunk fit onto a projecting shoulder portion of a metal seal retainer detachably mounted on the valve member, and the valve seat includes a projecting ridge formed by intersecting flat surface portions disposed at an obtuse angle to one another, whereby the plastic annular sealing ring will be engaged by the valve seat ridge when the valve member is seated.
Claims9
A blow-down safety valve for use with elevated temperature fluid systems, and the like, said valve including a casing formed with an annular valve seat having two flat surfaces intersecting one another to form a projecting edge, and a valve member selectively movable to a position seated on said valve seat, said valve member including a seal retaining compartment having a bottom surface and two parallel side surfaces extending generally perpendicularly from said bottom surface, and an annular plastic ring mounted in said seal retaining compartment for abutment with said bottom and side surfaces thereof with the remaining surface of said plastic ring being positioned to contact said valve seat projecting edge, said plastic ring being pre-stressed to a condition whereby the areas of contact between said plastic ring and said projecting edge remain substantially constant with respect to one another to predetermined elevated fluid temperatures.
Dependencies are inferred from the claim text.