Hydraulic cylinder for use for example in a hydraulic tool

A hydraulic cylinder, for example for use in a hydraulic tool, comprising

• at least one piston/cylinder combination composed of a cylinder body and a piston accommodated in said cylinder body and provided with a piston rod that projects from said cylinder body, wherein the cylinder body and the piston body define a first cylinder chamber while the cylinder body, the piston body and the piston rod define a second cylinder chamber, and wherein during operation the piston performs alternating forward and return operational cycles under the influence of a fluid under pressure that is conducted to the first and the second cylinder chamber through a first and a second line, respectively,
• a control valve which regulates the supply of a fluid under pressure through the first or the second line to the piston/cylinder combination, and
• a separation valve which regulates the discharge of fluid under pressure from the second cylinder chamber in dependence on the pressure difference between the first and the second cylinder chamber, and
• a safety valve which is passive in a first position and which in a second position, if the pressure in the second cylinder chamber is higher than a preset load pressure, connects the second cylinder chamber to the first cylinder chamber via the separation valve.