Technical Specifications / Parameters Parameter Specification / Description Product Name Fisher enhanced ENVIRO-SEAL System Type Fugitive Emissions Containment System for Valve Stems Compatible Valves Fisher easy-e® globe valves (e.g., GX, HP, ET), rotary valves (Vee-Ball®, V100, V500), and many other globe and rotary designs. Pressure Rating Matches the pressure rating of the parent control valve body (e.g., ANSI Class 150 through 2500). Temperature Range Standard: -50°F to +450°F (-46°C to +232°C) High-Temp: Options available for services up to +800°F (+427°C). Emissions Performance Certified to meet < 100 ppmv methane when tested according to US EPA Method 21. Capable of achieving near-zero emissions. Connection Port 1/4" NPT female, standard for purge/sniff connection and monitoring. Primary Packing Material Typically a combination of flexible graphite (for high temp) and reinforced flexible graphite or PTFE (for corrosion/chemical resistance). Secondary Seal Material Flexible Graphite, Grafoil®, or PTFE-based materials. Body & Hardware Materials Carbon Steel (standard for hardware), Stainless Steel (for the seal housing and bolts).
