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API 6D Standard for Ball Valves – Full Guide for Pipeline and Process Applications

When it comes to pipeline ball valves, safety, reliability, and regulatory compliance are non-negotiable. That’s where the API 6D standard comes in—a globally accepted specification from the American Petroleum Institute for ball valves used in oil & gas transmission, distribution, and refinery pipelines.

At Perfect Engineers, our API 6D-compliant ball valves are engineered to meet the toughest demands of high-pressure, high-volume, and high-integrity pipeline operations across global markets.

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What is API 6D?

API 6D is the American Petroleum Institute’s specification for pipeline valves including:

Ball valves
Gate valves
Plug valves
Check valves

It defines the design, manufacturing, testing, and documentation requirements for valves used in pipeline transportation systems for petroleum and natural gas industries

Why API 6D Matters for Pipeline Valves

Mandatory for transmission and distribution pipelines globally
Ensures leak-tight shut-off, safe operation, and high reliability
Accepted by major oil & gas companies, EPCs, and regulatory authorities
Suitable for both buried and above-ground installation

Key Features of API 6D Ball Valves

Feature	API 6D Requirement
Design	Full or reduced bore, trunnion or floating design
Sealing	Soft-seated (PTFE) or metal-seated (for fire-safe use)
Fire-Safe Certification	API 607 or ISO 10497 compatible
Testing	Hydrostatic, shell, seat leakage, backseat, and air test
Operation	Manual, gear, electric, pneumatic, or hydraulic actuators
Double Block & Bleed	DBB or DIB1/DIB2 types available
Drain/Vent Ports	Required for maintenance and safety
Design Pressure Classes	ANSI Class 150, 300, 600, 900, 1500, and 2500
Documentation	Full DQ/IQ/OQ, MTC, QA checklist, Hydro test report

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Safety & Compliance Built-In

Anti-blowout stem
Lockable handle or actuator-ready
High temperature sealing (Graphite/Metal)
Fire-tested to API 607 / ISO 10497
Fugitive emission control available (ISO 15848)

Available API 6D Valve Configurations

Valve Type	Details
Trunnion Mounted Ball Valve	Ideal for high pressure (Class 600+)
Double Block & Bleed (DBB)	Primary & secondary seal + bleed
Top Entry Ball Valve	Inline maintenance and quick access
Fully Welded Ball Valve	Tamper-proof, ideal for buried pipelines
Flanged or Butt Welded Ends	ANSI/DIN/JIS options

Typical Applications of API 6D Ball Valves

Oil & gas pipelines
Petrochemical processing
Refineries & tank farms
LNG / CNG distribution
Offshore platforms
Metering skid packages
Compressor and pump stations

FAQs

Is API 6D required for all ball valves?

No—it’s required for pipeline applications, but not mandatory for general industrial use.

What is the difference between API 6D and API 608?

API 6D is for pipeline valves, includes block & bleed, drain, and vent testing.
API 608 is for general industrial ball valves (floating/trunnion) without mandatory DBB features.

Can you automate API 6D valves?

Yes—API 6D valves come with ISO 5211 actuator mounting, and can be equipped with pneumatic, electric, or hydraulic actuators.

What documentation comes with API 6D valves?

MTC (EN 10204 3.1)
Hydro test & air test reports
Fire-safe test certs (if applicable)
Drawing, BOM, torque chart
Compliance declaration

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