Pressure Class Asme 150 (20 Pn) Bonnet Type Closed Bonnet Industry Standard Asme B1634 Orb Trim T3 Standard Trim Body Material Wcc Carbon Steel Core A-105 Forging Overlay Nickel Face Stem Aisi 8620 Seat Material 410 Ss Seat Insert Teflon Fastener Grade Stud Grade B7 Fastener Grade Nut Grade 2H Packing Ring Materials Teflon Fire Safe Valve Operator Handwheel Minimum Temperature -20 Maximum Temperature 500 Tempunits F Rating Psi