In the representative embodiments of the new and improved methods and apparatus disclosed herein, a full-bore reversing and circulating valve is cooperatively arranged to be tandemly coupled in a typical string of drillstem testing tools including a pressure-actuated test valve. Pressure-actuated valve means 20 are arranged within the housing of the new and improved apparatus of the present invention and adapted for movement therein in an extended span of travel between spaced upper and lower port-opening positions in response to changes in the direction of the pressure differential acting on the valve means. Indexing means 26 are provided which include a sleeve member 28 rotatably arranged on the valve means and ratchet-and-pawl means 62, 63 cooperatively arranged for incrementally advancing the sleeve along multiple angular positions around the valve means in response to the longitudinal movements of the valve means. Stop means 73, 74 are also provided on the valve means and sleeve for blocking the movement of the valve means to its port-opening positions 43, 44 until the sleeve has been advanced to a predetermined angular position in relation to the valve means.
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