Marston GR Graphite Discs incorporate a unique recess arrangement ensuring non-torque sensitivity when clamping the flange bolts, a feature not associated with the universal flat Series 2 designs.
The additional use of pure superior grade graphite, impregnated with high quality resins achieves close burst tolerance performance.
All graphite discs fragment upon bursting and are not recommended for relief valve protection.
Discs subjected to reverse pressure or vacuum may require the addition of a ‘dial’ or bar support. Vent area will be reduced, contact CMC for further details.
Discs with a burst pressure above 1.7 barg will withstand full vacuum without additional support.
Graphite discs are suitable for temperatures ranging from -70°C to 180°C. For higher temperatures the disc can be protected using a Temperature Shield, for use up to 500°C.
Temperature Shields must not be used with reverse pressure / vacuum supports.