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A valve means to be installed in a string of drill pipe above a bottom hole positive displacement motor comprises a hollow housing (1) having an inlet and an outlet for the passage of a drilling fluid therethrough, the wall of the housing having through holes (4) to communicate the interior of the h

A valve means to be installed in a string of drill pipe above a bottom hole positive displacement motor comprises a hollow housing (1) having an inlet and an outlet for the passage of a drilling fluid therethrough, the wall of the housing having through holes (4) to communicate the interior of the housing with the annular space of the well bore. Secured in the housing (1) substantially above the through holes is a transverse plate or partition (5) provided with a plurality of calibrated openings (6) intended to produce a pressure drop. The housing (1) further accommodates a chamber (7) communicating with the through holes (4) and provided with an open face in the upper portion thereof, the chamber (7) being arranged such that through passages (10) are formed between the chamber (7) and the housing (1). The housing further comprises a sealing couple (12) intended to prevent the through holes (4) from communicating with the interior of the housing (1) in the course of drilling operation. A valve seat (13) of the couple is adapted to fit the circumference of the open face in the upper portion of the chamber (7), whereas a spring-loaded valve element (14) of the couple is capable of being moved axially under the action of the pressure drop, the valve element having a tail-piece (15) the end of which is adapted at least to level with the upper surface of the partition (5).

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Valve means for installation in a well bore of a string of drill pipe to overlie a bottom hole positive displacement motor comprising a hollow housing having an inlet and an outlet for the passage of drilling fluid separated by a partition having a plurality of calibrated openings to produce a press

Valve means for installation in a well bore of a string of drill pipe to overlie a bottom hole positive displacement motor comprising a hollow housing having an inlet and an outlet for the passage of drilling fluid separated by a partition having a plurality of calibrated openings to produce a pressure drop through said housing, said housing having a plurality of through holes in the wall thereof to communicate the interior of the housing with the well bore, a sleeve closed at its bottom end and open at its upper end located within said housing adjacent the area of the through holes, said sleeve defining an interior chamber having radial holes in the wall thereof aligned with said through holes and a plurality of axial passages for the drilling fluid to pass through to said string, a sealing couple for closing the through holes during drilling, said sealing couple comprising a valve seat and a spring loaded valve element adapted to move axially under the action of the pressure drop within said housing to close against the valve seat, said valve seat, being adapted to fit the circumference of the upper open end of said sleeve, said valve element being provided with a tail piece, the end of which is adapted to extend at least to the level of the upper surface of said partition.