VALVE SEAT APPARATUS FOR USE WITH FLUID VALVES

摘要

A valve seat apparatus for use with fluid valves is provided. The valve seat apparatus (302) comprises a seat ring (302), a seal assembly (422) and a retainer (424). The seat ring (302) has an outer surface (402) that includes a first annular recess (414) and a second annular recess (416) adjacent the first annular recess (414) to form a stepped profile (418). The seal assembly (422) is disposed within the first annular recess (414), and the retainer (424) is disposed within the second annular recess (416) to retain the seal assembly (422). The valve seat apparatus is engaged with the cage (314) and the valve body (304). When the valve stem (318) is moved up or down by an actuator, a closure member (316) can open or close the openings (322) of the cage (314) to allow or obstruct the fluid to flow between the inlet (308) and the outlet (310).