This infographic is designed to provide an overview of API 6A gate valves and includes gate valve basics, what the API 6A standard covers and why valves fail.
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Key takeaway points
- Gate Valves are used for open and shut off and are not suitable for regulating flow.
- API 6A is the American Petroleum Institute Standard for oil and gas wellhead equipment.
- A forged body is stronger than cast body.
- Valves with a slab gate are simpler than the expanding gate type and capable of withstanding greater working pressures.
- Valves with an expanding gate are used to create a seal against both the upstream and downstream sealing faces.
- There are 2 types of flange connection 6B and 6BX.
- Commonest reasons for valve failure are seat / seal problems and underlying causes of scoring / galling.
- Problematic API valves can be recovered using Mirage on-site machining equipment.