![]() ![]() ![]() 1, eight-thread series, Class 2B.Ĥ.6.3 Threaded bolt holes shall allow full thread engagement to a depth at least equal to the nominal bolt diameter however, when the bolt hole is adjacent to the shaft, engagement to a depth of 67 % of the nominal bolt diameter is acceptable.Ĥ.6.4 Typical bolting options for lug- and wafer-type valves are shown in Figure 1.Ĥ.7.1 Seat retainer plates (designed per Figure 2) are separate plates intended to retain and compress the valve seat and shall be mechanically fastened to the valve body. ![]() or more in diameter, such holes shall be drilled and tapped in accordance with ASME Bi. or less in diameter shall be drilled and tapped in accordance with ASME B1.1, coarse-thread series, Class 2B. 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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January 2023
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