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The diverter valve is carried in a housing that serves as a length of drill string. A selector valve is actuated by selective mud flow control signals from the surface and can close to build internal pressure to move a poppet to open a by-pass channel. Positive resilient seals are carried inside a p

The diverter valve is carried in a housing that serves as a length of drill string. A selector valve is actuated by selective mud flow control signals from the surface and can close to build internal pressure to move a poppet to open a by-pass channel. Positive resilient seals are carried inside a protective sleeve until the principal openings are closed, then the seal is deployed to stop leakage.

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1. A flow diverter apparatus housed in a length element of pipe string for use in wells, with a diverter valve controllable from the earth surface and situated to change the path of a fluid flow moving from an upwardly continuing pipe string to selected flow paths within the length element, the appa

1. A flow diverter apparatus housed in a length element of pipe string for use in wells, with a diverter valve controllable from the earth surface and situated to change the path of a fluid flow moving from an upwardly continuing pipe string to selected flow paths within the length element, the apparatus comprising:a) a housing arranged to function as a length element of a pipe string, with a fluid channel extending longitudinally therethrough, and a general central opening; b) a selector valve situated in said housing to variably resist the flow of fluid in said fluid channel to change the pressure drop in said channel in response to signals generated at the surface; c) a piston situated in said opening for movement therein between first and second positions in response to said changes in said pressure drop; d) a diverter valve, actuated by movement of said piston, to change the flow path of said fluid; and e) a biasing spring arranged to move said piston from a position to which said piston is moved when said pressure drop is increased.