John Crane 5-ring, test proven Emission Packing Sets EPS-1 and EPS-2 combine John Crane G58I and Crane-foil" packing to provide the best emission compliant packing available. Test results have proven conclusively that these packing sets will contain valve emissions to below 500 ppm.

Two high density John Crane G58I graphite die-formed rings form the top and bottom sealing rings. A high strength, high temperature wire mesh encapsulates the yarn, providing additional tensile strength and extrusion resistance. These rings ensure compression of the middle sealing rings and will prevent any packing extrusion.

Three medium density Crane-foil die-formed rings with internal wave form comprise the center sealing rings which are completely contained between the end rings.

EPS
Low leakage Emission Packing Set (EPS) consisting of a presized set of rings. This set can be either statically loaded or live-loaded. Specifications for live-loading include spring configuration and gland bolt torque requirements.

EPS-1
This packing set will seal the majority of liquids, light hydrocarbons and gases, encountered in a refinery or petrochemical plant. In addition, Excellent for high temperature, high pressure steam applications.

EPS-2
Is designed with concave/convex middle rings and end rings effectively reducing valve stem torque requirements. This design is recommended for control valves that have a high cycle frequency.

End Rings
John Crane's Style G58I rings are manufactured by using a high purity, flexible graphite yarn which is first braided and then die formed into high density end rings. The Crane-foil flexible graphite yarn is reinforced with a high strength.

Middle Rings
The middle rings are manufactured from John Crane's Style 267 Crane-foil flexible graphite tape which contains a passive inhibitor. The flexible graphite contains no binders and is chemically inert. The rings are die-formed using a unique process.