Complete API 608 Compliance Guide
12.02.2025 |
A definitive summary of the API 608 requirements for metal ball valves.
Source: SVF Tech Brief No. 1089 — API 608 Standard for Valve Requirements
Table of contents
- What is API 608?
- Scope & Valve Classes Covered
- API 608: Requirements
- SVF Ball Valves Listed as API-608 Compliant
What is API 608?
API 608 is the standard titled “Metal Ball Valves – Flanged, Threaded and Welding Ends”. It covers additional requirements for metal ball valves that are in full conformance with the requirements of ASME B16.34.
Scope & Valve Classes Covered
- Flanged and butt-welding end valves in standard classes 150, 300 and 600.
- Socket welding and threaded end valves in standard classes 150, 300, 600 and 800.
API-608: Requirements
- Valve pressure-temperature rating shall be the lesser of the shell rating or the seat rating.
- Full and reduced port ball valves must meet minimum bore diameter requirements.
- Stem must be electrically “grounded” to the body (anti-static device).
- Hollow ball components are not allowed (unless specifically accepted by the customer).
- Stem torsional strength must be at least twice the maximum operating torque (Safety Factor = 2).
- Torsional failure of the stem must be external to pressure-containing envelope and stem packing.
Anti-Static Device: additional detail
Valves should incorporate an anti-static feature ensuring electrical continuity between the stem and the body, or stem, body and ball providing a discharge path with resistance less than 10 ohms.
SVF Flow Control Ball Valves That Comply with API 608
The following SVF valve series as complying with API 608: