Spiral wound type gaskets suitable for wide range of operating conditions and can be adapted to suit almost all applications. Spiral wound type gaskets are a combination of a filler winding materials made from graphite, PTFE or mica and a profiled metal are available which enable the gasket to meet the requirement of varied operating conditions. Metallic outer and inner ring can be attached as required by operating condition and application.

MARKING TO ASME B16.20


QSW1 SPIRAL WOUND GASKET

The QSW1 Spiral Wound gasket has no metal ring. This style is suitable for tongue and groove face connection and sometimes for male and female face connection but not suitable for ordinary pipe flange of raised face. This style is commonly used for valve bonnet, pressure vessels, etc.

QSW2 SPIRAL WOUND GASKET

The QSW2 Spiral Wound gasket has metal inner ring. As inner ring works as reinforcement to prevent internal extrusion or inward buckling of gasket windings caused by compression, this style is suitable for male and female face connection but not suitable for ordinary pipe flange of raised face.

QSW3 SPIRAL WOUND GASKET

The QSW3 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.

QSW4 SPIRAL WOUND GASKET

The QSW4 Spiral Wound gasket has both metal outer and inner ring. As inner ring works to prevent internal extrusion or inward buckling, this style is especially recommended for the following cases.
- For flanges NPS 24 and larger in class 900, NPS 12 and larger in class 1500 and NPS 4 and larger in class 2500#.
- PTFE filler material.
- For socket welding, lapped, welding neck and integral flanges. This style is suitable for pipe or pressure vessels using raised face flange connection.