The sealing principle of step seal is mainly based on the characteristics of its structure and material. It usually consists of an O-shaped seal made of synthetic rubber and a trapezoidal seal filled with teflon. step seal can achieve the sealing effect by compression deformation, which makes the sealing ring and the sealing surface form a close contact, so as to prevent the leakage of the medium. The structural design of step seal makes it have good elasticity and corrosion resistance, which makes it able to maintain an effective sealing effect in harsh working environments such as high pressure and high temperature.
step seal is divided into two types of step seal for hole and step seal for shaft, which have one-way sealing effect. Due to the small lip contact area of step seal, it can produce greater compression deformation and obtain better sealing effect. However, the step seal sealing ring is easy to wear, and its sealing effect will be significantly reduced after wear. In order to solve this problem, the O-ring can be superimposed with it to form a combined seal. In this way, even after the lip is worn, the greater elasticity of the synthetic rubber seal ring will force the lip of the lip seal ring to stick close to the sealing surface, producing enough surface contact stress to achieve the sealing effect. In addition, the combined seals have low friction resistance, smooth operation, and easy assembly and maintenance, so they are widely used in static pressure forming machine and medium pressure and high pressure ceramic forming machine.