The inner retaining ring increases the axial rigidity and resilience of the gasket. Its purpose is to help avoid excessive compression due to high seating stress in high-pressure service and to reduce turbulence in the flange area. The advantages to using an inner ring include the following: Provides additional compression stop and blowout resistance, prevents build up of process fluid, minimizes erosion and turbulence, shields the gasket, prevents buckling and promotes tightness. To view our line of Spiral Wound Gaskets, click here.