Arrangement for feeding at least a part of a drilling machine, drilling system and method for feeding at least a part of a drilling machine

An arrangement for feeding at least a part of a drilling machine in at least a first direction, the arrangement comprising:

• a first end portion,
• a second end portion,
• an outer cylinder,
• a piston,
• a piston rod,
• wherein a first part of the arrangement is arranged to be attached to the drilling machine, a second part of the arrangement is arranged to be supported by the ground and the outer cylinder extends between the end portions, whereby the piston and the piston rod are displaceably arranged in the outer cylinder such that the piston along with the piston rod, the outer cylinder and the end portions delimits a first chamber and a second chamber for a pressure medium in the outer cylinder on a respective side of the piston, and
• a valve connected to the first chamber for reducing the pressure medium in the first chamber and which valve is arranged to be opened at an increased pressure in the second chamber, wherein the second chamber is connected to a valve chamber, such that a pressure in the valve chamber increases at an increased pressure in the second chamber.