A ring-type spiral wound gaskets that has an outer and an inner metal ring. The inner ring prevents inner buckling of the sealing element and creates a physical barrier that shields the sealing element from heat and media while preventing erosion. Usually material that we use for IOR type will be carbon steel and SS316L.
This style is recommended for higher pressure applications, and is available for ASME B16.50 and B16.47 (Series-A and B) flange types.
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