API 594 pdf download

API 594 pdf download Check Valves: Flanged, Lug, Wafer and Butt-welding 4.1.16 When valve design utilizes a stem that extendsbeyond the pressure boundary,it shall be provided with ameans so that,in the event of a structural failure of stem-to-closure attachment items, the stem will not be ejected throughthe pressure boundary while the valve is under pressure.4.2PLATES AND DISC Valves are classified...