Patent ID: 7926454

Claim:
A method of generating pressure pulses through a pressure pulse transmitting body ( 9 ) that is displaceable arranged in a chamber ( 2 ), by which the flow of a pressure fluid into and out of said chamber ( 2 ) is electromechanically controlled for the purpose of accomplishing pressure changes for the displacement of the pressure pulse transmitting body ( 9 ), by a pressure pulse generator that comprises: said chamber ( 2 ), divided into a first and a second parts ( 3 , 4 ), at least one operable valve body ( 12 ) for opening/interrupting a communication between the first and second parts ( 3 , 4 ) of the chamber, a first conduit ( 7 ) that leads between a high pressure source ( 5 ) and the first part ( 3 ) of the chamber ( 2 ), a second conduit ( 8 ) that leads between a low pressure source ( 6 ) and the second part ( 4 ) of the chamber ( 2 ), said pressure pulse transmitting body ( 9 ) being displaceably arranged in the second part ( 4 ) of the chamber ( 2 ) and being in contact, on one hand, with the pressure fluid in the chamber ( 2 ), and, on the other hand, with an environment and being spring loaded in a direction towards the chamber ( 2 ), means for opening/interrupting the communication between the first part ( 3 ) of the chamber ( 2 ) and the high pressure source ( 5 ), and means for opening/interrupting the communication between the second part ( 4 ) of the chamber ( 2 ) and the low pressure source ( 6 ), characterized in that the communication between the high pressure source ( 5 ) and the first part ( 3 ) of the chamber ( 2 ) and the communication between the low pressure source ( 6 ) and the second part ( 4 ) of the chamber ( 2 ) are kept interrupted while the communication between the first and second parts ( 3 , 4 ) of the chamber ( 2 ) is opened and a displacement of the pressure pulse transmitting body ( 9 ) out of the chamber ( 2 ) is accomplished, and the communication between the first and second parts ( 3 , 4 ) of the chamber ( 2 ) is kept open for a re-establishment of a high pressure in the first part ( 3 ) of the chamber ( 2 ) while the pressure pulse transmitting body ( 9 ), by the spring load, is displaced back towards a retracted start position while the communication between the high pressure source ( 5 ) and the first part ( 3 ) of the chamber ( 2 ) and the communication between the low pressure source ( 6 ) and the second part ( 3 ) of the chamber ( 2 ) are kept interrupted.