Reverse acting lock open crossover valve

Claim 1

A crossover valve apparatus adapted for use in a well bore having a first tubing string and a second tubing string inside a portion of the first tubing string comprising: a housing operably connectable to the first tubing string and having a pair of axially spaced apart seal bores and at least one lateral opening in the wall of said housing located intermediate said seal bores; and, a mandrel operably connectable to the first tubing string, within said housing, said mandrel being movable axially between a first position and a second position relative to said housing and having a first seal engaging one of said seal bores in both of said positions, a second seal spaced axially from said first seal and engaging one of said seal bores in said first position and engaging the other said seal bore in said second position, at least one side port in the wall of said mandrel located between said first and second seals, a crossover defining a first passage communicating said at least one side port and the second tubing string and a second passage communicating said mandrel above said crossover and said mandrel below said crossover, and releasable means for locking said mandrel and said housing in one of said first or second positions and for allowing said mandrel and said housing to move the other of said first or second positions, wherein said releasable means comprises a jay-slot and a cooperating jay-pin.