A hydraulic damper, in particular a motor vehicle hydraulic suspension damper, comprising: a tube filled with working liquid; a piston assembly disposed slidably inside the tube, dividing the tube into a rebound chamber and a compression chamber, characterized in that the piston assembly includes two sleeve-shaped members, a rebound valve assembly (41r, 42r), and a compression valve assembly (41c, 42c), wherein each of the rebound valve assembly (41r, 42r) and the compression valve assembly (41c, 42c) includes a deflectable-disc valve and a blow-off valve; an internal chamber extending between the two sleeve-shaped members; a piston rod attached to the piston assembly and extending outside the tube through a sealed piston rod guide; wherein each of the sleeve-shaped members defines a plurality of blow-off valve flow passages, which are radially proximal, a plurality of deflectable-disc valve flow passages, which are radially distal, and a central opening, wherein the piston rod passes through said central openings in each of said sleeve-shaped members; each of the deflectable-disc valves including at least one deflectable disc covering an external end of said deflectable-disc valve flow passages of a corresponding one of said sleeve-shaped members; wherein each of said at least one deflectable disc is axially fixed at said piston rod and defines a plurality of radially proximal flow passages corresponding to said blow-off valve flow passages of a corresponding one of said sleeve-shaped members; each of the blow-off valves including at least one disc (422, 423) adjoining an internal end of said blow-off valve flow passages of a corresponding one of said sleeve-shaped members; wherein a flow channel (4221, 426) fluidly connects said internal chamber with said blow-off valve flow passages of each sleeve-shaped members; and wherein the piston assembly further comprises a spring seat abutting said at least one disc (422, 423) of each of the blow-off valves, and at least one spring disposed within said internal chamber and configured to bias said spring seats towards said at least one disc (422, 423). a tube filled with working liquid; a piston assembly disposed slidably inside the tube, dividing the tube into a rebound chamber and a compression chamber, characterized in that the piston assembly includes two sleeve-shaped members, a rebound valve assembly (41r, 42r), and a compression valve assembly (41c, 42c), wherein each of the rebound valve assembly (41r, 42r) and the compression valve assembly (41c, 42c) includes a deflectable-disc valve and a blow-off valve; an internal chamber extending between the two sleeve-shaped members; a piston rod attached to the piston assembly and extending outside the tube through a sealed piston rod guide; wherein each of the sleeve-shaped members defines a plurality of blow-off valve flow passages, which are radially proximal, a plurality of deflectable-disc valve flow passages, which are radially distal, and a central opening, wherein the piston rod passes through said central openings in each of said sleeve-shaped members; each of the deflectable-disc valves including at least one deflectable disc covering an external end of said deflectable-disc valve flow passages of a corresponding one of said sleeve-shaped members; wherein each of said at least one deflectable disc is axially fixed at said piston rod and defines a plurality of radially proximal flow passages corresponding to said blow-off valve flow passages of a corresponding one of said sleeve-shaped members; each of the blow-off valves including at least one disc (422, 423) adjoining an internal end of said blow-off valve flow passages of a corresponding one of said sleeve-shaped members; wherein a flow channel (4221, 426) fluidly connects said internal chamber with said blow-off valve flow passages of each sleeve-shaped members; and wherein the piston assembly further comprises a spring seat abutting said at least one disc (422, 423) of each of the blow-off valves, and at least one spring disposed within said internal chamber and configured to bias said spring seats towards said at least one disc (422, 423).