API 609:2004 pdf download

API 609:2004 pdf download.Butterfly Valves: Double Flanged, Lug- and Wafer-Type.
Note I: When salve body liners. sleeves, or Oring seals act as flange-scaling surfaces, separate gaskets should not tic used unless specifically recommended by the manufacturer.
Note 2: akts with liners that cstcnd to the gasket seating surfaces should be bolted up with the disc in the partially open position.
4.3.2 Face-to-face dimensions for double flanged valvcs are listed in Table 2-H for long pattern valves, or Table 2-C for short pattern valves.
4.3.3 Body contact faces of cast iron, ductile iron, and cast copper alloy valves that require separate gaskets shall be finished as specified in MSS SP-6.
4.3.4 Body contact faces of steel or alloy valves that require separate gaskets shall be finished as specified in
ASME II 16.5.
4.4 DISC CLEARANCE
The rnanulacwrer shall design the valve disc to provide suitable clearance, in accordance with the ASME class rating for the valve, the inside diameter of the connecting pipe or flange. and the criteria covered in the appendix to this standard.
Note: For lug- and wafer-type valves and sonic double flanged designs. the disc will project beyond the body faces when the disc is tumcd. The purchaser should review the design of the piping to ensure that there will be no interlerence between the disc and idjacent components such as the pipe lining, strainers, check valves, and other valves. During valve installation, the mating flanges shall be aligned before final tightening of the flange bolis to ensure proper valve operation and the seating of any seals and gaskets.
4.5 SHAFT AND SHAFT SEALS
4.5.1 The shaft to disc connection and all parts of the shaft within the pressure boundary shall, under torsional load, exceed the strength of the shaft that lies outside the pressure boundary by more than 10%. The determination of shaft strength shall be by calculation or testing.
4.5.2 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. The design shall not t’ely on actuation components (e.g.. gear operators. actuators, levers. etc.) to prevent shaft ejection.
4.53 The shaft-to-disc connection shall be designed to prevent loosening due to vibration.
4.5.4 For Category H valves, the shaft shall have a surface finish of 32 microinchcs (0.80 micrometers) Ra or smoother in the area in contact with the packing, and the siufhng box shall have a surface finish of 125 microinches (3.2 micrometers) Ra or smoother. Measurement may be by visual and tactilc comparison or by usc of a stylus-type surfacc roughness measuring instrument (ASML B-Ui. I).
4.5.5 Category B valves shall have adjustable shaft packing. The packing mechanism shall allow packing adjustment while the valve is pressuritcd with line Iluid.
4.6 PIPING CONNECTION EXTERNAL BOLT HOLES
4.6.1 Unless spcciticd otherwise in the purchase ordcr. tugs of lug-type valves shall be provided with tapped holes for studs or bolts.
4.6.2 Threaded body- flange boles for bolts I inch or less in diameter shall be drilled and tapped in accordance with ASME B 1.1. coarse-thread series. Class 2B. For bolts l1/x inches or more in diameter, such holes shall he drilled and tapped in accordance with ASME Bl.l. eight-thread series. Class 2B.
4.6.3 Threaded bolt holes shall allow full thread engagement to a depth at least equal to the nonunal 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.
4.6.4 Typical bolting options for lug- and wafer- type valves are shown in Figure 1.
4.7 SEAT RETAINER—CATEGORY B VALVES ONLY
4.7.1 Seat retainer plates (designed per Figure 2) are sep arate plates intended to retain and compress the valve scat and shall be mechanically Fastened to the valve body. Retaining fasteners shall be recessed to or below the flange gasket surface.