M-Class Block & Bleed Valves are not only fully bi-directional, they seal bubble tight with full differential pressures or a 1psi pressure drop. Features include: High pressure options, (Up to Class 4500), NACE compatibility, live-loaded metal seats, our proprietary boronizing process, arcuate cut balls, exotic alloys, and integral body options. We can fully customize them with varying end caps, different size trim sets, and flexible face to face dimensions.