Abstract: A hub mounted grease cap having a sleeve with an inner end and an outer end. The outer end has an outer end surface that is opposite the inner end. The sleeve encloses a bore that extends through the sleeve. The inner end has an outer diameter that may be a press fit or threaded connection to a hub into which it is installed. An end plug has an end wall and an aperture through the end wall. There is a shaft that extends through the aperture in the end wall of the end plug. A wedge block is connected to the shaft. A seal has a portion that is located between the end wall of the end plug and the wedge block. The seal expands radially outward against the bore of the sleeve when the wedge block is drawn toward the end wall.

Abstract: Presented is a subsurface safety valve in which the flapper mount, hard seat and spring housing have been integrated into a single assembly. To accommodate a “soft seat insert,” a special retainer soft seat ring and soft seat seal are provided. The soft seat seal fits over a conical protruding surface (hard seat) that surrounds the main bore of the safety valve on the bottom side of the spring housing. The retainer ring fits over the soft seat seal and holds it in place against the conical surface. Notches along the perimeter of an upper flanged end of the soft seat seal prevent gases, such as nitrogen, from becoming trapped behind the seal and potentially damaging it during a rapid decompression event. A gap between the upper flanged end of the soft seat seal and the lower spring housing allow the seal to move up and down the conical protruding surface as the flapper opens and closes, reducing compression of the seal and the risk of a compression set due to repeated opening and closing of the flapper.