Myth 1, the greater the amount of compression spring seal better. In actual fact, the spring compression excessive friction can cause rapid wear, instantly burning; excessive compression of the spring to lose the ability to adjust the ring face, resulting in seal failure. Myth 2, ring seal Fig tight as possible. In fact, ring seals tight harm than good. First exacerbate inter-ring and sleeve wear, premature leakage; Second, increasing the axial adjustment ring, the resistance movement, frequent changes in operating conditions can not make timely adjustments; Third spring fatigue easily damaged; four is to make the ring seal deformation, affecting the sealing effect.