Abstract: A flow control valve for use inside a wellbore. In one implementation, the flow control valve may include a housing, a chamber disposed inside the housing and an entry port disposed at a first end of the chamber. The entry port may be configured to allow fluid to enter into the chamber. The flow control valve may further include an exit port disposed at a second end of the chamber. The second end may be opposite of the first end and the exit port is configured to allow fluid to flow out of the chamber. The flow control valve may further include a check valve assembly disposed between the entry port and the exit port. The check valve may be configured to allow fluid to flow from the entry port to the exit port and to prevent fluid to flow from the exit port to the entry port.

Abstract: An embodiment of a method of shifting a valve between a plurality of flow condition positions, includes the steps of providing a mechanical indexer device in operational connection with a valve, the indexer device including a primary path defining a sequence through a plurality of valve positions at and between open and closed and a detent moveable along the primary path; providing at least one alternate path from a point along the primary path to a preceding position on the primary path along the sequence; shifting the valve to a subsequent position in the sequence; and shifting the valve to the preceding position in the sequence.

Abstract: An embodiment of a method of shifting a valve between a plurality of flow condition positions, includes the steps of providing a mechanical indexer device in operational connection with a valve, the indexer device including a primary path defining a sequence through a plurality of valve positions at and between open and closed and a detent moveable along the primary path; providing at least one alternate path from a point along the primary path to a preceding position on the primary path along the sequence; shifting the valve to a subsequent position in the sequence; and shifting the valve to the preceding position in the sequence.

Abstract: A flow control valve for use inside a wellbore. In one implementation, the flow control valve may include a housing, a chamber disposed inside the housing and an entry port disposed at a first end of the chamber. The entry port may be configured to allow fluid to enter into the chamber. The flow control valve may further include an exit port disposed at a second end of the chamber. The second end may be opposite of the first end and the exit port is configured to allow fluid to flow out of the chamber. The flow control valve may further include a check valve assembly disposed between the entry port and the exit port. The check valve may be configured to allow fluid to flow from the entry port to the exit port and to prevent fluid to flow from the exit port to the entry port.