seat 140 closing the pilot seat orifice 145 lifting the flow throttling device 26150 into the flow throttling device orifice 150 thereby generating a pressure pulse a pilot valve 26225 is comprised of the pilot 26220 the pilot seat 140 and the pilot seat orifice 145 further rotation of the motor 130 drive shaft 26910 and outer magnets 26510 move the pilot actuator assembly 135 and pilot 26220 away from the pilot seat 140 causing the flow throttling device 26150 to move away from the flow throttling orifice 150 thereby generating a negative pressure pulse the inner magnets 26410 are isolated from the drilling mud 115 via a double rolling bellows 26310 which is described further in fig4 a pulse in the drilling mud 115 is sensed by the uphole system comprised of a pressure transducer and or other sound wave receivers and communicated optionally with wireless devices to a computer 165 not shown for interpretation and data reception and storage additionally further description of fig2 b shows the turbine 110 which resides within the lower annular flow channel 120 of the flow guide 23480 the lower annular flow channel 120 may have special diverting vanes 38013 that direct the flow of the drilling mud 115 through and around the surface of the turbine 110 the diverter vanes 38013 project from.