Engineering Reference
Valve Standards & Certifications
Detailed reference guides for the API, ASME, NACE, and ISO standards that govern industrial valve design, testing, material selection, and environmental compliance.
API 6D
Specification for Pipeline and Piping Valves
API 607
Fire Test for Quarter-Turn Valves and Valves Equipped with Nonmetallic Seats
ASME B16.34
Valves
API 598
Valve Inspection and Testing
NACE MR0175 / ISO 15156
Petroleum and Natural Gas Industries
API 609
Butterfly Valves: Double-Flanged, Lug- and Wafer-Type
ISO 15848
Measurement, Test, and Qualification Procedures for Fugitive Emissions
API 526
Flanged Steel Pressure-Relief Valves
Design & Dimensional Standards
Specification for Pipeline and Piping Valves
API 6D is the most widely cited standard for pipeline and piping valves in the oil and gas industry.
Read standard guide
Valves — Flanged, Threaded, and Welding End
ASME B16.
Read standard guide
Butterfly Valves: Double-Flanged, Lug- and Wafer-Type
API 609 is the dimensional and performance standard for butterfly valves in petroleum and natural gas service.
Read standard guide
Flanged Steel Pressure-Relief Valves
API 526 is the standard for flanged steel pressure relief valves (PRVs / PSVs) used in petroleum, petrochemical, and natural gas processing.
Read standard guide
Testing & Inspection Standards
Fire Test for Quarter-Turn Valves and Valves Equipped with Nonmetallic Seats
API 607 is the fire-test standard for quarter-turn valves (ball valves and butterfly valves) and other valves with soft (non-metallic) seats and seals.
Read standard guide
Valve Inspection and Testing
API 598 is the universal valve testing and inspection standard, defining acceptable leakage rates (leak classes) for hydrostatic shell tests, seat leakage tests, and backseat tests.
Read standard guide
Measurement, Test, and Qualification Procedures for Fugitive Emissions — Industrial Valves
ISO 15848 defines the test procedures and acceptance criteria for fugitive emissions (stem leakage) from industrial valves — primarily the leakage of volatile organic compounds (VOCs), methane, and other greenhouse gases around the stem packing.
Read standard guide
Certifications Vajra Valves Carry
All certification documentation is supplied as standard with every order. Third-party inspection at manufacturer's works is accepted and coordinated at no additional charge.
Need Valves to a Specific Standard?
Share your standard requirement — API 6D, NACE MR0175, ISO 15848, IBR — and we'll quote compliant valves with full certification in 24 hours.