Flapper closure mechanism
First Claim
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1. A safety valve assembly, comprising:
- a housing having a bore therethrough;
a flapper pivotally mounted in said housing for movement between an open and a closed position;
a movable flow tube to contact said flapper to urge it toward its open position; and
a closure system mounted outside said bore in said housing and not directly hydraulically operated to urge said flapper to its closed position, said closure system, without being pinned to said flapper, converting said pivotal movement of said flapper toward its open position to a linear movement of said closure system for the purpose of creating a potential energy force for subsequent movement of said flapper by said closure system to its closed position.
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Abstract
A closure mechanism for a flapper features a pinion on the ear extending from the flapper that is used to mount it for pivotal movement. A spring-loaded rack meshes with the pinion or pinions on the flapper so that when the flow tube swings the flapper open, rotation of the pinion teeth advances the teeth on the rack against the force of a spring. When the flow tube is retracted, the spring pushes the teeth on the rack in the opposite direction causing a rotational movement of the flapper toward closure in contact with a conforming seat.
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Citations
17 Claims
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1. A safety valve assembly, comprising:
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a housing having a bore therethrough;
a flapper pivotally mounted in said housing for movement between an open and a closed position;
a movable flow tube to contact said flapper to urge it toward its open position; and
a closure system mounted outside said bore in said housing and not directly hydraulically operated to urge said flapper to its closed position, said closure system, without being pinned to said flapper, converting said pivotal movement of said flapper toward its open position to a linear movement of said closure system for the purpose of creating a potential energy force for subsequent movement of said flapper by said closure system to its closed position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification