Trap case subassembly and trap

The utility model discloses a case subassembly, especially a high -pressure trap case subassembly. The utility model provides an it receives the trap case subassembly that erodees to alleviate sealed face, which comprises a valve core and a valve seat, the whole annular structure that is big -end -up of disk seat, the upper portion of anchor ring is conical sealed face in the disk seat, and the lower part of anchor ring is the anchor ring in the disk seat, the case is cylindric, and the case can cooperate with the sealed face seal of disk seat, still include cylindric valve plug, the valve plug sets up in case bottom and coaxial with the case, the size of valve plug is matchd with the anchor ring of disk seat, when the case cooperated with valve seat seal, the valve plug formed one buffer space in inserting the anchor ring of disk seat between case, disk seat and the valve plug, in addition, also have one annular groove on the valve plug. The utility model discloses a primary seal face can not receive strong erodeing, and its life -span is more than traditional valve.