Category
Valves
Subcategory
Quarter-Turn
Applicable standards
6
Issuing bodies
2
Description
Trunnion-mounted ball valve, typically forged, for pipeline & high-pressure service.
Applicable Standards (6)
API — 4 standards
API 6D / ISO 14313
Pipeline and Piping Valves
Ball, check, gate, and plug valves for pipeline service.
Key requirements (7)
- Pipeline valves — ball, gate, check, plug for liquid and gas pipelines.
- Pressure classes: ASME B16.34 (150–2500) plus API-specific (10000 / 15000 psi).
- Full-bore (full opening) — passes pipeline pig with min restriction.
- Fire-safe per API 6FA / ISO 10497.
- Anti-static device required (ball/stem ground continuity).
- Double Block & Bleed (DBB) and Double Isolation & Bleed (DIB) configurations.
- Cavity over-pressure relief required (self-relieving seat or cavity vent).
API 6FA
Fire Test for Valves
Fire-type testing of valves to demonstrate fire-safe performance.
API 608
Metal Ball Valves — Flanged, Threaded and Welding Ends
Floating and trunnion-mounted metal ball valves, Class 150–600.
Key requirements (5)
- Metal ball valves — flanged, threaded, welded ends.
- Soft-seated (PTFE / RPTFE / PEEK) or metal-seated.
- Pressure rating per ASME B16.34.
- Hydrotest per API 598.
- Floating ball (smaller sizes) or trunnion-mounted (larger sizes).
API 598
Valve Inspection and Testing
Inspection, examination, supplementary examinations and pressure-test requirements for valves.
Key requirements (5)
- Valve inspection and testing — covers the test requirements referenced by other valve standards.
- Tests: shell (high-pressure water), backseat (where applicable), low-pressure pneumatic seat, high-pressure hydrostatic seat, optional high-pressure pneumatic seat.
- Allowable leakage: zero for resilient-seated; small allowable rate for metal-seated (Table 6).
- Test duration: minimum hold times by valve size.
- Visual examination during pressurization.