Patent ID: 7600534

Claim:
A safety valve for use in an oilfield tubular, the safety valve comprising: a housing having a longitudinal bore extending therethrough, a flapper valve member mounted in said housing and being hingeably movable relative to said longitudinal bore, said flapper valve member having an open position allowing fluid flow through said longitudinal bore and a closed position disallowing fluid flow through said longitudinal bore, and first and second springs engageable with said flapper valve member, said second spring including at least one elastically deformable member being elongated around a path that follows the circumference of said longitudinal bore and being non-coiled along its entire length, said at least one elongated elastically deformable member being associated with said flapper valve member at one location and with said housing at least one other location, whereby said first and second springs provide biasing forces to move said flapper valve member into a closed position.