초록 ▼

A hydraulically actuated well subsurface safety valve having a tubular member telescopically movable in the housing for controlling the movement of a flapper valve closure member in which a seal is telescopically movable in the housing and positioned in the path of travel of the lower end of the tub

A hydraulically actuated well subsurface safety valve having a tubular member telescopically movable in the housing for controlling the movement of a flapper valve closure member in which a seal is telescopically movable in the housing and positioned in the path of travel of the lower end of the tubular member for sealing against the lower end of the tubular member. A spring urges the seal towards the tubular member for sealing when the valve is in the open position for limiting damaging fluid flow across the valve closure member.

대표청구항 ▼

A well subsurface safety valve comprising, a housing having a bore, a flapper valve closure member in the bore moving between open and closed positions, a tubular member telescopically movable in the housing for controlling the movement of the valve closure member, means for moving the tubular membe

A well subsurface safety valve comprising, a housing having a bore, a flapper valve closure member in the bore moving between open and closed positions, a tubular member telescopically movable in the housing for controlling the movement of the valve closure member, means for moving the tubular member downwardly for opening the valve closure member, biasing means contacting the tubular member for moving the tubular member upwardly for allowing the valve member to close, coacting engaging shoulders on the tubular member and said housing spaced from the lower end for limiting downward movement of the lower end of the tubular member, a movable resilient and non-metallic seal means telescopically movable in the housing and positioned in the path of travel of the lower end of the tubular member, stop means between the housing and the seal means limiting the extent of travel of the seal means in the upper and lower directions, and spring means between the housing and the movable seal means for urging the seal means toward the tubular member for sealing against the lower end of the tubular member when the valve is in the open position.