Patent ID: 8353642

Claim:
A screed for a road finishing machine having a basic screed comprising at least one screed plate and at least one extendable screed comprising at least one screed plate, the extendable screed being connected to the basic screed and being movable linearly relative to the basic screed along a guiding device fixed to the basic screed and at least one double-actuated hydraulic cylinder connected between the extendable screed and the basic screed, for laying a payment according to at least one payment laying parameter, the at least one double-actuated hydraulic cylinder being operable to change the working width of the screed by linear movement of the extendable screed relative to the basic screed with at least one hydraulic cylinder, at least one magnetically actuated proportional directional control valve controlled by an electro-hydraulic control for controlling the direction of motion of the hydraulic cylinder and being operable to change a rate of motion of the hydraulic cylinder manually and/or automatically depending on the at least one pavement laying parameter by feeding current to the magnet of the directional control valve, and the proportional directional control valve being actuated by at least one proportional magnet with a proportional electric direction actuation by the proportional magnet or a proportional-electric-hydraulic pilot controlled actuation by the proportional magnet.