Introduction to Internal and External Ring Spiral Wound Gaskets

Internal and external ring spiral wound gaskets are sealing gaskets made of composite metal and non-metal materials. They belong to the semi-metallic sealing type and are widely used in petrochemical, power, and shipbuilding industries. Their core structure consists of V-shaped or W-shaped stainless steel strips alternately wound with filler materials such as graphite and PTFE. Metal reinforcing rings are added to the inner and outer sides to control the tightness and installation positioning, adapting to the static sealing requirements of flange connections.

　　Through the combination of metal and non-metal layers, this gasket combines elasticity and pressure resistance, capable of withstanding temperatures from -196℃ to 650℃ and pressure environments below 26MPa, and can adapt to complex working conditions such as chemical corrosion and vacuum. Products are divided into basic types and types with internal and external rings, with materials including 304 and 316 stainless steel and Monel alloy metal strips, combined with non-metallic fillers such as graphite and ceramic fiber to meet the sealing requirements of different media. The outer welded positioning band design reduces installation displacement and is suitable for high and low pressure fluctuations and vibration scenarios in valves, pumps, and other equipment. The product complies with multiple international and industry standards such as HG, GB, and ASME. The inner and outer spiral wound gaskets with excellent resilience can automatically adjust to the pressure, thermal cycle and vibration of the piping system. They are especially suitable for applications with uneven loads, easy loosening of joints, periodic changes in temperature and pressure, and impacts or vibrations.