When specifying or designing valves, reference should be made to the Operating parameters for that particular well. All valves purchased must at least meet the standards set in API 6A PSL 1, 2, 3 or 4 and in several areas must exceed those standards. Cases where the standards are exceeded are specialised exceptional cases. The preferred route is to purchase to API 6A latest edition at the PSL-3, PR-2 level.
1 Design Features 1.1 End connections
For safety reasons we do not recommend valves or pipe fittings with screwed connections. The valve . . .