API 609-2004 pdf free download

API 609-2004 pdf free download.Butterfly Valves: Double Flanged, Lug- and Wafer-Type.
4.1.5 Shaft-to-Lever Connections Shaft-to-lever connections shall be designed so that the lever always correctly indicates the disc position. 4.2 BODY 4.2.1 The minimum body-wall thickness shall comply with the applicable ASME B 16 standard listed in Section 2 based on the body material. If the applicable standard covers fttings for a particular material, the valve minimum wall thickness shall be as specified for fittings. The valve design shall be structurally suitable for its stated pressure and temperature limits, taking into account that localized thinning may be nec- essary between the shaft bore in the body and the adjacent bolt holes. Such sections shall be designed in accordance with the requirements of ASME B 16.34. 4.2.2 When a wafer-type valve is installed between piping flanges and the disc is in the closed position, the valve shall be self-centering, that is, designed to center itself within the bolt circle by using the valve ‘s outside diameter, or by means of integral or attached alignment devices. 4.2.3 End flanges for double flanged valves shall be inte- grally cast or forged with the body; however, flanges may be attached by full-penetration butt welding if agreed to by the purchaser. End flanges attached by welding shall conform to ASME B16.5 and have butt-welding ends for use without backing rings. Welds shall conform to ASME B31.3, as shall qualifications for the welding procedure and the welder or welding operator. The finished weld thickness shall not be less than the minimum body-wall thickness. 4.2.4 If drain or bypass connections are specifed by the purchaser, they shall conform to ASME B16.34 or MSS SP- 45, as applicable.
3.3.1 For Category B valves the valve seat ratings for PTFE and RPTFE shall be at least equal to those listed in Table 3. For seating materials not listed in Table 3, seat ratings shall be agreed upon by the purchaser and the manufacturer. 3.3.2 Valves furnished with internal liners, encapsulation, resilient seating materials, or a combination of these features shall have pressure-temperature limits conforming to the valve manufacturer’s published specifications. Temperature limits shall be marked on the nameplate as required in 7.1. 3.4 DIFFERENTIAL PRESSURE RATING A valve’s differential pressure rating measures the valves capability to hold pressure from one side either at shutoff or in the partly open position with flow in the line. 4 Design 4.1 GENERAL 4.1.1 Category B Valves Valves manufactured in accordance with this standard shall meet the requirements of ASME B 16.34 for standard class and any additional requirements as specified in this standard. For materials not listed in B16.34, the applicable require- ments and design rules of B 16.34 shall be used. In the event of a conflict between ASME B 16.34 and this standard, this standard shall prevail. 4.1.2 Fire Tested Valves If the purchaser specifies fire tested valves, the valves shall be certified to have been tested to, and met, all of the perfor- mance requirements of API Standard 607. Supporting docu- mentation shall be made available to the purchaser upon request. .
4.10 PACKING GLAND BOLTING (CATEGORY B VALVES ONLY) 4.10.1 When used, gland bolting shall pass through holes in the gland. The use of open slots is not permitted in the cover flange, cover, adjuster, or gland. 4.10.2 Packing gland bolts shall be designed so that the bolt stresses shall not exceed one third (/3) of the minimum ulti- mate tensile strength of the bolt with a packing stress of 5500 psi (380 bar) and a gland bolt temperature of 100°F (38°C). 5 Materials 5.1 BODY 5.1.1 The bodies of double flanged, lug- and wafer-type butterfly valves shall be made of a material conforming to a purchaser-selected material specification in accordance with the applicable ASME standard listed in Section 2. 5.2 TRIM 5.2.1 All wetted materials shall be the manufacturer’s stan- dard unless the purchaser specifies otherwise. Trim is defined as the seating surfaces of the body, disc, disc to shaft connec- tion hardware (e.g, keys, pins, screws, etc.) and any internal fasteners that are in contact with the process fluid. Shaft and bushing materials shall be determined by the manufacturer, tak- ing into account similar corrosion properties as the trim selec- tion while also meeting design requirements of Section 4.5. 5.2.2 Seats in the body and on the disc may be either sepa- rate or integral. Facings may be applied to valve bodies, discs, or both as deposited metal, integral metal, mechanically retained metal, or resilient materials.