System for supplying hydraulic pressure to a bolt elongation tool

System for supplying hydraulic pressure to a bolt elongation tool, comprising the bolt elongation tool with a pressure chamber and a tool piston, a hydraulic medium supply system including a reservoir that fluidly communicates directly with the pressure chamber, and a hydraulic actuator with an actuator cylinder housing an actuator piston,

• wherein the actuator cylinder is connected to the pressure chamber in a pressure-tight and liquid-tight manner in order to supply via the pressure chamber the hydraulic pressure by a hydraulic medium to the tool piston,
• wherein the hydraulic actuator is an electro-hydraulic actuator comprising an electric motor operable to generate the power of the electro-hydraulic actuator and that the actuator piston is built to supply, with one stroke of an actuator stroke height of the actuator piston, at least a volume of the hydraulic medium that is needed to move the tool piston for an amount of one tool stroke height of the tool piston,
• wherein the system is configured to supply a pressure of at least 1000 MPa, and
• wherein the actuator cylinder includes a first fluid connection and a second fluid connection, and:
• when the actuator piston is in a fully retracted state, the actuator cylinder is connected to the reservoir by the first fluid connection, and actuator cylinder is connected to the pressure chamber by the second fluid connection;
• and
• when the actuator piston is in a fully extended state, both the first fluid connection and the second fluid connection are blocked by the actuator piston so as to maintain hydraulic pressure in the pressure chamber.

A system, comprising:

• a bolt elongation tool including a pressure chamber and a tool piston, the pressure chamber configured to supply a pressurized hydraulic medium to a surface of the tool piston, and the bolt elongation tool configured to releasably engage a bolt;
• a hydraulic system including a reservoir configured for fluid communication with the pressure chamber, and for fluid communication with an actuator cylinder within which is received an actuator piston;
• a motor at least indirectly connected to the actuator piston, and the motor is operable to move the actuator piston within the actuator cylinder, and
• wherein the actuator cylinder is configured so that when the actuator piston is in a fully extended state:
• the actuator piston prevents fluid communication between the actuator cylinder and the reservoir;
• and the actuator piston prevents fluid communication between the actuator cylinder and the pressure chamber.