Smith check valves are manufactured in piston, ball and swing configurations. All types of end connections and pressure classes from 150 through 2500 are available. Our offering includes many material types: A105, LF2, F11, F5, F22, F9,  316/316L,  304/304L, 316H, 304H, 317/317L, 321, 347, 347H, F51,  F44,  F20,  I825,  I600, and M400.  All valves are manufactured in accordance with all applicable API 602 and ASME B16.34 standards.

link:http://www.smithvalve.com/products/check/