Patent attributes
An actuator for a downhole tool includes first, second, and third sleeves. The first sleeve obstructs a first port in a body of the downhole tool when the first sleeve is in a first position. The third sleeve obstructs a second port in the body when the third sleeve is in a first position, and the second and third sleeves are in one-way engagement with one another. A biasing member is positioned between the first sleeve and the third sleeve. The first sleeve is configured to move from the first position and toward the third sleeve in response a pressure communicated through the first port. When the pressure is reduced after the first sleeve is moved toward the third sleeve, the biasing member forces the first sleeve back toward the first position, which causes the third sleeve to permit fluid communication through the second port.
