F-Class Metal Seated Ball Valves, Fast, Flexible, Flawless. Ball and seats have the most advanced coating/surface hardening technology options available, to provide the best solution for critical applications Metal ball and seats are lap matched to provide tight shut-off. Only four components (body, bonnet and flanges) need to be manufactured on demand for any valve, regardless of size, pressure class or material. Available in all commercially available materials (Hastelloy, Alloy 20, Duplex, etc.)