The packing mechanism shall allow packing adjustment while the valve is pressurized with line fluid.Ĥ.6 Piping Connection External Bolt HolesĤ.6.1 Unless specified otherwise in the purchase order, lugs of lug-type valves shall be provided with tapped holes for studs or bolts.Ĥ.6.2 Threaded body-flange holes for bolts 1 in. Measurement may be by visual and tactile comparison or by use of a stylus-type surface roughness measuring instrument (refer to ASME B46.1).Ĥ.5.5 Category B valves shall have adjustable shaft packing. gear operators, actuators, levers, etc.) to prevent shaft ejection.Ĥ.5.3 The shaft-to-disc connection shall be designed to prevent loosening due to vibration.Ĥ.5.4 For Category B valves, the shaft shall have a surface finish of 0.80 jim (32 jim.) Ra or smoother in the area in contact with the packing, and the stuffing box shall have a surface finish of 3.2 pm (125 pin.) Ra or smoother. The design shall not rely on actuation components (e.g. API STD 609:2009 pdf download.Butterfly Valves: Double-flanged, Lug- and Wafer-type.Ĥ.5.2 The shaft and/or shaft retention shall be designed so that, if failure of the shaft to disc connection or of the shaft occurs, no portion of the shaft can be ejected from the valve as a result of internal pressure.
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