Patent ID: 7472669

Claim:
A method of generating pressure pulses through a pressure pulse transmitting body ( 3 ) that is displaceably arranged in a chamber ( 2 ), by which the flow of pressure fluid into and out of said chamber ( 2 ) is controlled electromechanically for the purpose of accomplishing pressure changes for the displacement of the body of a pressure pulse generator that comprises: said chamber ( 2 ), divided by said body ( 3 ) into a first and a second parts ( 4 , 5 ), a first spring and a second spring ( 16 , 17 ), arranged to displace said body ( 3 ) in a first direction and a second direction respectively in said chamber, a first conduit ( 11 ) leading between a high pressure source ( 9 ) and a first part ( 4 ) of the chamber ( 2 ), wherein the pressure fluid in the first part ( 4 ) of the chamber acts on said body ( 3 ) for displacing the latter in the second direction, and means ( 13 , 14 ) for opening/interrupting a communication between the first part ( 4 ) of the chamber ( 2 ) and the high pressure source through the first conduit ( 11 ), characterized in that—the communication between the first part ( 4 ) of the chamber ( 2 ) and the high pressure source ( 9 ) is kept interrupted during a displacement of the body ( 3 ) from a predetermined starting position in the first direction by means of a triggering of the first spring ( 16 ), and that the communication between the first part ( 4 ) of the chamber ( 2 ) and the high pressure source ( 9 ) is kept open while the body ( 3 ) is displaced back in the second displacement direction to said starting position, whereby a biasing of the first spring ( 16 ) is accomplished.