A shock absorber comprising - a cylinder; - a piston movable within the cylinder along a cylinder wall, the piston sealing against the cylinder wall and dividing the cylinder in a first cylinder chamber at a first piston side of the piston and a second cylinder chamber at a second piston side of the piston, the second piston side opposing the first piston side, and the first and second cylinder chambers being filled with a fluid; - a cylinder attachment constructed and arranged for attachment to a first part of a vehicle and connected to the cylinder; and - a piston attachment constructed and arranged for attachment to a second part of a vehicle and connected to the piston, the piston attachment and cylinder attachment being arranged to move towards one another on an inward movement and away from one another on an outward movement, wherein the piston comprises - - a channel (140, 240) constructed and arranged for fluid connection between the first and second cylinder chambers (13, 14); and - - a valve (120, 220) constructed and arranged to open the channel (140, 240) for fluid flow on one of inward movement and outward movement in dependence of a fluid pressure in the channel, and to at least substantially close the channel for fluid flow on the other one of inward movement and outward movement, the valve comprising a plate pack (120, 220), the plate pack closing against a first valveseat (125, 225) and comprising - - - a recess plate (123, 223) that comprises at least one recess (123a, 223a) in fluid communication with a side of the plate pack from which fluid may pass the plate pack upon opening from the first valve seat (125, 225); and - - - a cover plate (124, 224) adjacent the recess plate so as to cover the recess, the cover plate and recess being configured and arranged such that a fluid connection is provided across the plate pack upon opening of the cover plate with respect to the recess plate. - a cylinder; - a piston movable within the cylinder along a cylinder wall, the piston sealing against the cylinder wall and dividing the cylinder in a first cylinder chamber at a first piston side of the piston and a second cylinder chamber at a second piston side of the piston, the second piston side opposing the first piston side, and the first and second cylinder chambers being filled with a fluid; - a cylinder attachment constructed and arranged for attachment to a first part of a vehicle and connected to the cylinder; and - a piston attachment constructed and arranged for attachment to a second part of a vehicle and connected to the piston, - - a channel (140, 240) constructed and arranged for fluid connection between the first and second cylinder chambers (13, 14); and - - a valve (120, 220) constructed and arranged to open the channel (140, 240) for fluid flow on one of inward movement and outward movement in dependence of a fluid pressure in the channel, and to at least substantially close the channel for fluid flow on the other one of inward movement and outward movement, the valve comprising a plate pack (120, 220), the plate pack closing against a first valveseat (125, 225) and comprising - - - a recess plate (123, 223) that comprises at least one recess (123a, 223a) in fluid communication with a side of the plate pack from which fluid may pass the plate pack upon opening from the first valve seat (125, 225); and - - - a cover plate (124, 224) adjacent the recess plate so as to cover the recess, the cover plate and recess being configured and arranged such that a fluid connection is provided across the plate pack upon opening of the cover plate with respect to the recess plate. - - - a recess plate (123, 223) that comprises at least one recess (123a, 223a) in fluid communication with a side of the plate pack from which fluid may pass the plate pack upon opening from the first valve seat (125, 225); and - - - a cover plate (124, 224) adjacent the recess plate so as to cover the recess, the cover plate and recess being configured and arranged such that a fluid connection is provided across the plate pack upon opening of the cover plate with respect to the recess plate.