+ + + + + Home / Products / Series H Hy-Grade Series H (Flanged, Buttwelding & Hub Ended) Sizes: 1″ – 24″ Classes: ASME 150 – 2500 API 3,000 – 15,000 Optional Features: Full Flow – Full Opening NACE MR01-75 Series H Check Valve Ordering Information & Material Options Technical Information Download Catalog