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Flow pulsing apparatus is adapted to be connected in a drill string above a drill bit. The apparatus includes a housing providing a passage for a flow of drilling fluid toward the bit. A turbine in the housing is rotated about an axis by the flow of drilling fluid. A valve is operated by the turbine

Flow pulsing apparatus is adapted to be connected in a drill string above a drill bit. The apparatus includes a housing providing a passage for a flow of drilling fluid toward the bit. A turbine in the housing is rotated about an axis by the flow of drilling fluid. A valve is operated by the turbine to periodically restrict the flow through the passage to create pulsations in the flow and a cyclical water hammer effect to vibrate the housing and the drill bit during use. A cam is provided for effecting reciprocation of the valve along the axis of rotation of the turbine to effect the periodic restriction of flow.

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Flow pulsing apparatus adapted to be connected in a drill string above a drill bit and including a housing providing a passage for a flow of drilling fluid toward the bit, turbine means in said housing rotated about an axis by the flow of drilling fluid, and valve means operated by said turbine mean

Flow pulsing apparatus adapted to be connected in a drill string above a drill bit and including a housing providing a passage for a flow of drilling fluid toward the bit, turbine means in said housing rotated about an axis by the flow of drilling fluid, and valve means operated by said turbine means for periodically restricting the flow through said passage in a cyclical manner to create pulsations in said flow and a cyclical water hammer effect to vibrate the housing and the drill bit during use, said valve means including a valve member which is reciprocated in response to rotation of the turbine means to effect said periodic and cyclical restriction of the flow.