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Home / News / Industry news / What is Graphite Molded Die-Formed Ring

What is Graphite Molded Die-Formed Ring

Graphite Moulded Sealing Rings are manufactured from a pre-determined length of flexible graphite tape which is then, using a mould, compressed to form a solid ring of precise density and size. The ring is used as valve stem packing in pumps, valves, agitators, reciprocating equipment etc.
The ring is usually reinforced by metal foil, mesh, a steel plate or a wire net etc. This reinforcement prevents the graphite from extruding during operation. It is most commonly used for self sealing covers of fittings and valves.
It is ideal for use with dry gases and other fluids, where friction on standard graphite seals is unacceptably high. It reduces break-out friction for smoother valve action and retains exceptionally low friction characteristics for up to 20,000 valve cycles.
Valve stem and Static Sealing Packing.Its excellent sealing performance, corrosion resistance and ease of installation makes it ideal for valve stem packing in pumps, agitators, valves, reciprocating equipment etc. It also has good mechanical strength and is suitable for severe environments.
It is available in square section and V-shaped and wedge-shaped cross sections with a corrosion inhibitor acting as a sacrificial anode to protect the valve stem and stuffing box from corrosive substances. The material is made from low-sulphur expanded graphite without fillers or binders and is compressed in precision molding tools to the required density.