Description Supagraf® PremiPak is a superior combination packing set for valves. It is based on two of our class-leading graphite products that conform to Shell material specifications MESC SPE 85/203 and 85/204.
We also design and supply other high performance combination packing sets for valves. These are manufactured to meet end users' defined standards and specifications with regard to materials, construction, and the level of fugitive emission control required.
Construction & specifications End rings: Supagraf® Premier braided graphite filament packing for high strength and extrusion resistance with excellent sealability, plus third-party certification to TA Luft emission control requirements. These rings conform to MESC SPE 85/204.
Intermediate rings: Supagraf® Moulded Rings of high purity graphite foil, that offer low friction and excellent heat transfer characteristics, plus high efficiency sealing. These rings conform to MESC SPE 85/203.
Typical applications Stop valves and control valves performing arduous duties with media such as hydrocarbon liquid fuels and gases. Most applications require VOC fugitive emission control to 100ppm or better, with a maximum working temperature of up to 450°C.
Prime features
Reduced valve stem shudder and hesitation.
Low break-out friction.
Long working life with minimal maintenance.
Chemical properties Chemically inert within the range pH 1-14, excluding strong oxidising agents.
Typical service capabilities - valve stem duties Maximum temperature: +450°C Minimum temperature: -200°C Maximum system pressure: 25MPa
How supplied As precision moulded rings in endless form, or with single split, to meet customers' requirements. Sections: 3mm to 40mm. Diameters: 5mm to 500mm ID. Full fitting instructions are included.
Other designs of combination packing sets are supplied to order.
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