Valve Stem Seals type Flexitallic Enviroflex 500 is manufactured. Valve Stem Seals temp is 550†† (1022) °C (°F). Valve Stem Seals maximum pressure is 86 (12470) MPa(psi). pH limits of Valve Stem Seals are 0-14†. Valve Stem Seals are applied in high integrity valve stem sealing to reduce fugitive emissions in the petrochemical and chemical industry. High purity graphite tapeis formed into sealing elements of unique geometry with dissimilar densities in Valve Stem Seals. The specially designed header rings of Valve Stem Seals are braided from graphite filament yarn.
http://www.globalchemicalindustry.com/products-and-servies/sealing-products-insulation-materials-and-gaskets/flexitallic-ltd/
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