Abstract: A check valve with self-replenishing hydraulic damping system having a main valve chamber with an inlet and outlet and an adjustment valve aperture allowing for communication between the main valve chamber and the exterior of the valve. A valve disk is used to prevent upstream fluid flow when the valve disk is engaged with the valve seat. A biasing spring exerts a continuous upstream force upon the valve disk. A piston, one end of which is attached to the valve disk, the other end of which reciprocates with a fluid-filled cylinder having a servant check valve permitting upstream fluid flow into the cylinder and preventing downstream fluid flow out of the cylinder, alternately forces the cylinder fluid out of the cylinder through a control aperture into the main valve chamber by moving downstream and creates a vacuum within the cylinder by moving upstream, thereby replenishing the fluid within the cylinder.