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» ISW3 SPIRAL WOUND GASKET

The ISW3 Spiral Wound gasket is with outer metal ring. Outer ring works as:

1) centering a gasket properly between the flanges,

2) limiting bolt load at proper compression,

3) preventing external expansion by compression.

For PTFE filler gasket, this style is basically not recommended due to possibility of inward buckling during compression. This style is most common for ordinary pipe flange of raised face.