Importance

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Abstract

Pulse rates, rise and fall times of pulses and lifetimes of mud pulsing valves are substantially increased by providing a valve with a plurality of openable ports which simultaneously open and close to provide a collective flow path of the mud through the valve. By employing a plurality of ports, instead of one port, the time rate of change in the flow area, as the plurality of ports opens and closes, is substantially greater in the case of a single port. As a result, mud velocity falls much more quickly and the abrasion damage within the mud valve is less. The rate of change of the flow area on opening and closing is further increased by providing noncircular ports. In particular, trapezoidal ports are utilized so that they open across a corresponding straight edges. A plurality of such trapezoidal ports may be utilized to increase the rate of change of flow area with time to an even greater extent. The number of ports may be substantially multiplied by utilizing a center fed stator with an upper and lower surface and opposing upper and lower rotors through which the ports are defined.

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First Claim