What is this standard about?
It establishes basic requirements and practices for flanged, butt-welding, socket welding and threaded end steel ball valves having flow passageways identified as full bore, reduced bore and double reduced bore seat openings suitable for petroleum, petrochemical and allied industry applications.
Who is this standard for?
Specifiers, designers and manufacturers of metal ball valves.
Why should you use this standard?
It specifies the requirements for a series of metal ball valves suitable for petroleum, petrochemical, natural gas plants and related industrial applications.
It includes provisions for testing and inspection and for valve characteristics as follows:
- Flanged and butt-welded ends, in sizes 15 ≤ DN ≤ 600 (½ ≤ NPS ≤ 24)
- Socket welding and threaded ends, in sizes 8 ≤ DN ≤ 50 (¼ ≤ NPS ≤ 2)
- Body seat openings designated as full bore, reduced bore and double reduced bore
- Materials
NOTE: This standard covers valves of the nominal sizes DN: 8; 10; 15; 20; 25; 32; 40; 50; 65; 80; 100; 150; 200; 250; 300; 350; 400; 450; 500; and 600, corresponding to nominal pipe sizes NPS: ¼; ⅜; ½; ¾; 1; 1¼; 1½; 2; 2½; 3; 4; 6; 8; 10; 12; 14; 16; 18; 20; and 24 and applies for pressure designations: Class 150; 300; 600; 800 (Class 800 applies only for valves with threaded and socket welding end), PN 16; 25; 40; 63; and 100
What’s changed since the last update?
This standard supersedes the 2004 version. The following changes have been made:
- Scope increased to include DN 600, NPS 24, PN 63 and PN 100
- Clause 2, “Normative references” was updated
- Class 800 no longer restricted to reduce bore only
- Inclusion of reference and purchaser option to request valves conforming to ISO 15156 or NACEMRO103
- Expanded seat materials to include modified PTFE and reinforced modified PTFE
- In Table 1, inclusion of higher pressure temperature ratings that are more closely aligned with BS 5351 and account for improved performance attained from modified PTFE; separate listing for trunnion valves has been removed from Table 1
- Revised selected bore diameters in Table 2
- Purchaser needs to specify long or short pattern face-to-face dimension on ASME flanged valves
- Clarification that the strength of the stem above the packing shall be stronger than the internal portion at the maximum rated temperature
- Addition of purchaser option for requesting valve locking device
- Reduction of the permissible radial gap on end face flange interruptions to 0,8 mm
- Added provision for purchaser to request manufacturer to provide method for preventing excessive pressure when fluid is trapped in centre cavity between seats
- Expanded required information on identification tag to include separate trim and seat/seal materials. In addition, material for identification plate limited to stainless steel or nickel alloys
- Added requirement that thread sealant used on pugs for taped auxiliary connections be capable of the fully pressure-temperature rating of the value
- Added purchaser option to request export packaging
- Added purchaser option to request manufacturer identify recommended spare parts
