Abstract: A hydraulic vibration damper includes a noise-reducing valve structure that isolates the region of cavitation away from the metal structures forming the pressure cylinder, the piston and valve structures. The improved design includes a sharper rebound land edge angle forming a boundary near the valve exit, enlarging the region of working fluid adjacent the valve structure exit within which implosions can take place. This design also dispenses with the use of a skirt around the perimeter of the piston, and removes contact between the piston and the pressure cylinder. A support piston provides contact with the interior surface of the pressure cylinder. These features distance the region of cavitation from metal surfaces of the piston and valve structures, thereby significantly reducing the transmission throughout the vibration damper of noise and vibration caused by implosions within the working fluid.