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Methods and apparatus enable reliable and improved isolation between two portions of a bore extending through a casing string disposed in a borehole. A downhole deployment valve (DDV) may provide the isolation utilizing a valve member, such as a flapper, that is disposed in a housing of the DDV and

Methods and apparatus enable reliable and improved isolation between two portions of a bore extending through a casing string disposed in a borehole. A downhole deployment valve (DDV) may provide the isolation utilizing a valve member, such as a flapper, that is disposed in a housing of the DDV and is designed to close against a seat within the housing. The DDV includes an operating mechanism for opening/closing the DDV. In use, pressure in one portion of a well that is in fluid communication with a well surface may be bled off and open at well surface while maintaining pressure in another portion of the casing string beyond the DDV.

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1. A valve for use in a casing string, the valve comprising: a valve seat body;a valve member moveable between a first position in which the valve member is engaged with the valve seat body and a second position in which the valve member is disengaged from the valve seat body;an actuator sleeve mova

1. A valve for use in a casing string, the valve comprising: a valve seat body;a valve member moveable between a first position in which the valve member is engaged with the valve seat body and a second position in which the valve member is disengaged from the valve seat body;an actuator sleeve movable within the valve seat body between a retracted location spaced from the valve member and an extended location passing through the valve seat body to displace the valve member to the second position; anda closure mechanism that is configured to move the valve member from the second position to the first position, the closure mechanism having a linkage member with a first end operatively connected to the valve member and a second end operatively connected to a biasing member disposed around the valve seat body,wherein the linkage member traverses an interface between the valve seat body and the valve member. 2. The valve of claim 1, wherein the linkage member comprises a linkage arm. 3. The valve of claim 1, wherein the linkage member comprises a cable, the cable being configured to be attached to the valve member at a location that is opposite a pivot point of the valve member. 4. The valve of claim 3, further comprising a cam member attached to the valve member and the cable, the cam member being configured to support the cable. 5. The valve of claim 4, wherein the cam member is configured to move as the valve member moves between the first position and the second position. 6. The valve of claim 1, wherein the biasing member comprises a coil spring. 7. The valve of claim 1, wherein the biasing member has a first end and a second end, the first end being operatively connected to the linkage member and the second end being operatively connected to a base. 8. The valve of claim 7, wherein the biasing member has a first length when the valve member is in the first position and a second length when the valve member is in the second position. 9. The valve of claim 7, wherein the first length of the biasing member is longer than the second length of the biasing member. 10. The valve of claim 7, wherein the biasing member is compressed against the base when the valve member is in the second position. 11. The valve of claim 7, wherein the base may be moved from a first longitudinal position to a second longitudinal position along the valve seat body to adjust the amount of compression in the biasing member. 12. The valve of claim 7, wherein the linkage member extends through an opening in the base. 13. A valve for use in a casing string, the valve comprising: a valve seat body;a valve member moveable between a first position in which the valve member is engaged with the valve seat body and a second position in which the valve member is disengaged from the valve seat body;an actuator sleeve movable within the valve seat body between a retracted location spaced from the valve member and an extended location passing through the valve seat body to displace the valve member to the second position; anda closure mechanism that is configured to move the valve member from the second position to the first position, the closure mechanism having a linkage member with a first end operatively connected to the valve member and a second end operatively connected to a biasing member disposed around the valve seat body,wherein the linkage member comprises a cable, the cable being configured to be attached to the valve member at a location that is opposite a pivot point of the valve member. 14. The valve of claim 13, further comprising a cam member attached to the valve member and the cable, the cam member being configured to support the cable. 15. The valve of claim 14, wherein the cam member is configured to move as the valve member moves between the first position and the second position. 16. A valve for use in a casing string, the valve comprising: a valve seat body;a valve member moveable between a first position in which the valve member is engaged with the valve seat body and a second position in which the valve member is disengaged from the valve seat body;an actuator sleeve movable within the valve seat body between a retracted location spaced from the valve member and an extended location passing through the valve seat body to displace the valve member to the second position; anda closure mechanism that is configured to move the valve member from the second position to the first position, the closure mechanism having a linkage member with a first end operatively connected to the valve member and a second end operatively connected to a biasing member disposed around the valve seat body,wherein: the biasing member has a first end and a second end, the first end being operatively connected to the linkage member and the second end being operatively connected to a base, andthe base may be moved from a first longitudinal position to a second longitudinal position along the valve seat body to adjust the amount of compression in the biasing member. 17. A valve for use in a casing string, the valve comprising: a valve seat body;a valve member moveable between a first position in which the valve member is engaged with the valve seat body and a second position in which the valve member is disengaged from the valve seat body;an actuator sleeve movable within the valve seat body between a retracted location spaced from the valve member and an extended location passing through the valve seat body to displace the valve member to the second position; anda closure mechanism that is configured to move the valve member from the second position to the first position, the closure mechanism having a linkage member with a first end operatively connected to the valve member and a second end operatively connected to a biasing member disposed around the valve seat body,wherein: the biasing member has a first end and a second end, the first end being operatively connected to the linkage member and the second end being operatively connected to a base, andthe linkage member extends through an opening in the base.