KDAS combination sealing ring is a two-way acting piston sealing ring. This combination sealing ring is composed of an elastic rubber ring, two additional retaining rings and two wear-resistant rings. This design provides a compact combination of sealing and guiding, and is suitable for combined sealing rings installed in closed grooves. The combined sealing ring includes an elastic toothed sealing ring, two retaining rings and two wear-resistant rings. There is a real sealing element in the middle; a retaining ring and a wear ring are placed on each side. The retaining ring prevents the sealing ring from being squeezed into the gap; the sealing ring in the middle is a toothed sealing ring, which can play a good sealing role when it is stationary and moving. The function of the wear ring is to guide the piston in the cylinder and bear the radial force.