Patent ID: 7225771

Claim:
A method for controlling a pressure fluid flow in a pressure pulse generator, comprising a pressure fluid circuit ( 2 ) that, at a first end thereof, is connected with a pressure fluid source ( 7 ) and, at a second end thereof, is connected with a pressure fluid depression ( 8 ), a first branch ( 18 ) and a second branch ( 19 ) of the circuit ( 2 ), said branches leading from the pressure fluid source ( 7 ) to opposite sides of a valve body ( 3 ) that is displacebly located in a chamber ( 4 ), said chamber ( 4 ) having an opening ( 21 ) on one side of the valve body ( 3 ), said opening ( 21 ) communicating with the first branch ( 18 ) and permitting pressure fluid to flow out of the chamber ( 4 ), and wherein the valve body ( 3 ), under the action of the pressure fluid in the branches ( 18 , 19 ), is displaced to a first position in which it closes the opening ( 21 ) or to a second position, in which it leaves the opening ( 21 ) open for out-flow of the pressure fluid, characterized in that, during a first stage, for the purpose of accomplishing a pressure pulse departing from the opening ( 21 ), the valve body is displaced by letting the pressure fluid source ( 7 ) communicate with said chamber ( 4 ) through the first branch ( 18 ) while, simultaneously, the communication between the chamber ( 4 ) and the pressure fluid source ( 7 ) through the second branch ( 19 ) is interrupted.