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API 6D-2009 pdf free download

API 6D-2009 pdf free download.Specification for Pipeline Valves.
4.19 obturator closure member part of a valve, such as a ball, clapper, disc, gate or plug that is positioned in the flow stream to permit or prevent flow 4.20 operator device (or assembly) for opening or closing a valve 4.21 packing gland component used to compress the stem packing 4.22 position indicator device to show the position of the valve obturator 4.23 piggability capability of a valve to permit the unrestricted passage of a pig 4.24 powered actuator powered operator electric, hydraulic or pneumatic device bolted or otherwise attached to the valve for powered opening and closing of the valve 4.25 pressure class numerical pressure design class expressed in accordance with either the nominal pressure (PN) class or the ASME rating class NOTE In this International Standard, the pressure class is stated by the PN class followed by the ASME rating class between brackets. 4.26 pressure-containing parts parts, whose failure to function as intended results in a release of contained fluid into the environment 4.27 pressure-controlling parts parts, such as seat and obturator, intended to prevent or permit the flow of fluids 4.28 process-wetted parts parts exposed directly to the pipeline fluid 4.29 reduced-opening valve valve with the opening through the obturator smaller than at the end connection(s) 4.30 seating surfaces contact surfaces of the obturator and seat which ensure valve sealing 4.31 stem part that connects the obturator to the operator and which can consist of one or more components
6 Valve types and configurations 6.1 Valve types 6.1.1 Gate valves Typical configurations for gate valves with flanged and welding ends are shown, for illustration purposes only, in Figures 1 and 2. Gate valves shall have an obturator that moves in a plane perpendicular to the direction of flow. The gate can be constructed of one piece for slab-gate valves or of two or more pieces for expanding-gate valves. Gate valves shall be provided with a back seat or secondary stem sealing feature in addition to the primary stem seal. 6.1.2 Lubricated and non-lubricated plug valves Typical configurations for plug valves with flanged and welding ends are shown, for illustration purposes only, in Figure 3. Plug valves shall have a cylindrical or conical obturator that rotates about an axis perpendicular to the direction of flow.
6.1.3 Ball valves Typical configurations for ball valves with flanged or welding ends are shown, for illustration purposes only, in Figures 4, 5 and 6. Ball valves shall have a spherical obturator that rotates on an axis perpendicular to the direction of flow. 6.1.4 Check valves Typical configurations for check valves are shown, for illustration purposes only, in Figures 7 to 13. Check valves can also be of the wafer, axial flow and lift type. Check valves shall have an obturator which responds automatically to block fluid in one direction. 6.2 Valve configurations 6.2.1 Full-opening valves Full-opening flanged-end valves shall be unobstructed in the fully opened position and shall have an internal bore as specified in Table 1. There is no restriction on the upper limit of valve bore sizes. Full-opening through-conduit valves shall have a circular bore in the obturator that allows a sphere to pass with a nominal size not less than that specified in Table 1. Welding-end valves can require a smaller bore at the welding end to mate with the pipe. Valves with a non-circular opening through the obturator shall not be considered full opening.

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