Amplifier assembly

Pressure amplifier including a low pressure inlet for supplying a drive medium at low pressure, a low pressure piston with a first operational area and at least one high pressure piston with a second operational area, the second operational area being of same size or less than the first operational area, and at least one high pressure outlet, wherein a low pressure area (1) communicates with an operational chamber (29), which is limited by the low pressure piston (26) and a surrounding low pressure cylinder (7);

• where the at least one high pressure piston (12) is provided interacting with the low pressure piston (26), and the at least one high pressure piston (12) is co-axially arranged in a high pressure cylinder (13) relative to the low pressure piston;
• wherein a changeover valve (19) is coaxially arranged in the low pressure cylinder (7), and in connection with the changeover valve (19) there is arranged at least one impulse spring (10,36) coaxially around an impulse rod (24);
• wherein the at least one impulse spring (10,36) is arranged to be compressed at the movement of the low pressure piston so that at least one spring loaded locking mechanism (3, 35) is instantly released, the locking mechanism being built up of one or more springs (4) that press a locking member (3, 35) against a corresponding lock abutment formed in the changeover valve (19), so that the changeover valve shifts and opens for the drive medium supply to the operational chamber while simultaneously the low pressure piston, via contact with the high pressure piston, is moving the high pressure piston towards the high pressure outlet (15), whereby the impulse rod (24) via the at least one impulse spring (10,36) and mechanical stops (8,9,22,23,25) in an end position of the low pressure piston releases the locking mechanism (3, 35) whereby the changeover valve shifts and the drive medium, via a low pressure connection (6) via a check valve (11), presses the high and low pressure pistons back.