Patent ID: 7954555

Claim:
A downhole valve comprising: a housing comprising an upper end, a lower end, at least one port, and a bore disposed there-through, the bore comprising an inner wall surface having an upper recess and a lower recess, and the at least one port being in fluid communication with the housing bore and an outer wall surface of the housing; a lower valve member, the lower valve member comprising a lower valve bore having at least one lower valve port in fluid communication with the lower valve bore and the bore of the housing; an upper valve member disposed above the lower valve member, the upper valve member comprising an upper valve bore having at least one upper valve port in fluid communication with the upper valve bore and the bore of the housing, wherein the lower valve member comprises a run-in position in which the lower valve member blocks each of the at least one ports disposed in the housing and each of the at least one lower valve ports is disposed above the lower recess of the inner wall surface of the housing, and a set position in which each of the at least one ports disposed in the housing is not blocked by the lower valve member and each of the at least one lower valve ports is disposed in fluid communication with the lower recess of the inner wall surface of the housing, and wherein the upper valve member comprises a run-in position in which each of the at least one upper valve ports is disposed above the upper recess of the inner wall surface of the housing, and a set position in which each of the at least one ports disposed in the housing is blocked by the upper valve member, and each of the at least one upper valve ports is disposed in fluid communication with the upper recess of the inner wall surface of the housing, and wherein the lower recess comprises a larger volume than a volume of the upper recess.