API 608:2008 pdf download

API 608:2008 pdf download

API 608:2008 pdf download.Metal Ball Valves-Flanged,Threaded and Welding Ends.
5.8.4 Valves shall be closed by rotating the closure device (lever or handwheel) in a clockwise direction.5.8.5Position stops shall be provided for both fully open and fully closed positions of valve.
5.8.6 Handwheels on manual gear operators shall be marked to indicate the direction of opening andlor closing.
5.8.7 Lever type handles shall be parallel to the ball bore, so that lever always indicates ball bore position. If thepurchaser specifies round or oval direct-mounted handwheels, a permanent means of indicating ball bore positionshall be included in handwheel design.
5.8.8 An indication of the position of ball bore of the valve shall be integral with the valve stem. This indication maybe by permanent marking to the top of the stem, or by shape of exposed stem portion.
5.8.9 Levers, handwheels and other operating mechanisms shall be fitted so that they may be removed andreplaced without affecting the integrity of the stem seal(s), body seal(s) or stem retention means.
5.8.10 Lever or manual gear operators shall be designed so that the lever or gear operator cannot be assembled tothe valve other than in the correct configuration to indicate open and closed positions.
5.8.11 When specified in the purchase order, valves shall be furnished with a lockable device that accepts apurchaser-supplied padlock that allows the valve to be locked in both the fully open and fully closed positions. Thelockable device shall be designed such that a lock with a 5/16-in.(8-mm) diameter shank, not more than 4.0 in.(102 mm) long can be inserted directly through hole(s) in lockable device and locked. Provision for lockable device ispermitted, even when not specified on purchase order.
5.8.12 Position stops integral with packing gland, gland flange or gland bolting shall not be used,5.9End Flange Face Interruptions
5.9.1 Ring shaped radial gaps in the faces of end flanges of flanged ball valves, located in the sealing surface of acentered ASME B16.20 spiral-wound gasket, shall not exceed 0.030 in.(0.75 mm); see dimension b on Figure 1.Anexample of this condition is the radial gap that exists between the outer diameter of a body insert and the inner boreof the body end flange of a valve as shown in Figure B.1.
5.9.2 For ball valves designed with a body insert as shown in Figure B.1 , with a gasket seating face outer diameterlocated within the sealing area of a centered ASMEB16.20 spiral-wound gasket, the body insert flange face shall notprotrude beyond the valve body end flange face. The body insert flange face shall not be recessed below the bodyend flange face by more than 0.010 in.(0.25 mm). See dimension a on Figure 1.
5.10 Valve Shell Joints
5.10.1 Nut and bolt head bearing surfaces of shell parts assembled by bolting shall be perpendicular to thecenterline of tapped or clearance holes for the fasteners within ± 1.0 degree.
5.10.2 Bolting used for assembly of shell joints shall be studs with nuts or cap screws. Nuts shall be semi-finishedhexagons conforming to ASME B18.2.2.Bolts and studs shall be threaded in conformance to ASME B1.1 unlesspurchaser specifies metric series bolting.Bolting 1 in.(25.4 mm) or smaller shall have coarse (UNC) threads; boltinglarger than 1 in.(25.4 mm) shall be 8 thread series(8UN). Bolt and stud threads shall be Class 2A, and nut threadsshall be Class 2B per ASME B1.1.
5.10.3 Each bolted or threaded shell joint calculation shall be in accordance with the requirements of ASME B16.34,Section 6.4.