Valve with active seal and shaft blowout prevention device

Abstract

A top cap for a valve includes an upper surface; and a lower surface distal from the upper surface; wherein the upper surface and the lower surface of the top cap define a bore and a bore axis, the bore extending from the upper surface to the lower surface, the top cap defining: a minor bore of the bore, the minor bore intersecting the upper surface and defining a minor bore diameter; and a major bore of the bore, the major bore intersecting the lower surface and defining a major bore diameter, the major bore diameter greater than the minor bore diameter, the top cap including a bore shoulder, the bore shoulder defining a bore shoulder surface extending from the minor bore to the major bore, the bore shoulder surface angled with respect to the bore axis of the top cap.

Dependencies are inferred from the claim text.