The standard ASME Spiral Wound Gasket is the most common type of metal gasket used in industrial piping. These gaskets are designed to withstand high temperatures and pressures while protecting equipment from leaks during their expected lifespan.
There are a number of different spiral wound gasket types, each made with a slightly different design. There are three main design components: the outer ring, the inner ring and the sealing element.
Style CG - This type of spiral wound gasket consists of a metal strip that is shaped into a "V" or chevron. This helps push the windings to flex, which aids in preventing the metal windings from becoming stuck in the pipe when they suck in and get tangled up.A solid inner ring is added to this style of spiral wound gasket to prevent over-compression. It also increases the axial rigidity and resilience of the gasket.
Another benefit of the inner ring is that it prevents the windings from buckling inside the pipe. If the windings buckle, it can cause parts of them to be pulled into the pipe and eventually get wrapped around something, such as a valve or rotating equipment.
The ring will help ensure that the gasket is properly centered when it is placed on a bolted flange. It will also help keep the gasket from deflecting and extending past the flange face during tightening. In addition, it will provide additional radial strength to prevent the gasket from blowing out of the flange.