Valve’s Related Test Standards

Steel gates, globes and checks - API 598

Cast Iron gates - API 598, MSS SP-70*

Bronze gates, globes and checks - MSS SP-80*

Pressure seal valves - ASME B16.34*

Steel valves larger than NPS 24” - ASME B16.34*

Pipeline valves - API 6D*

Cast iron globes - API 598, MSS SP-85*

Cast iron checks - API 598, MSS SP-71*

Cast iron plugs - API 598, MSS SP-78*

Steel ball valves - API 598

Steel butterfly valves - API 598

Cryogenic valves - BS 6364, API 598

Pressure relief valves - ASME PTC 25, API 527

Control valves - ISA-S75, FCI 70-2

BS 6755 Valve Test Standard
Previously used by some European Manufacturers, now superseded by ISO 5208 (EN 12266-1) standard.
It includes leakage rates and testing criteria for metal and resilient seated valves.

API 598, “Valve Inspection and Test”
The most widely used test specification in the world today.
The document covers all types of valves in sizes through NPS 24.
It also includes leakage rates and testing criteria for metal-seated and resilient-seated valves.

API 527, “Seat Tightness of Pressure Relief Valves”
This document covers the seat tightness of pressure relief valves.
It also includes allowable leakage rates for testing with steam, water and air.

ASME B16.34, “Valves - Flanged, Threaded and Welding End”
The primary valve design document, it also contains charts for determining the working pressures of valves to be used in conjunction with other test standards, such as API 598. B16.34 contains a test procedure, but no seat leakage acceptance criteria.

ASME PTC 25, “Pressure Relief Devices”
The main reference document for the testing of pressure relief valves, PTC 25 contains detailed procedures for testing relief valves with air or steam.

FCI 70-2, “Control Valve Seat Leakage”
This document contains detailed test procedures and leakage rate classes for control valves. The leakage classes are also occasionally referenced by other documents and used as acceptance criteria.

ISA-S75, “Hydrostatic Testing of Control Valves”
It provides a procedure for the hydrostatic shell testing of control valves. Closure testing and acceptance criteria are out of the scope of this document and usually are covered by referencing FCI 70-2.

ISO 5208, “Industrial Valves, Pressure Testing of Valves”
ISO’s primary testing standard, this document covers all types of valves and has four levels of allowable closure test leakage.

MSS SP61, “Hydrostatic Testing of Steel Valves”
Similar to API 598, this document has some subtle differences in test holding times and leakage rates.

MSS SP70, “Cast Iron Gate Valves, Flanged and Threaded Ends”
The primary design document for cast iron gate valves, it also contains testing procedures and acceptance criteria.

MSS SP71, “Cast Iron Swing Check Valves, Flanged and Threaded Ends”
The primary design document for cast iron check valves also contains testing procedures and acceptance criteria.

MSS SP78, “Cast Iron Plug Valves, Flanged and Threaded End”
The primary design document for cast iron plug valves also contains testing procedures and acceptance criteria.

MSS SP80, “Bronze Gate, Globe, Angle and Check Valves”
The primary design document for commodity bronze valves also contains testing procedures and acceptance criteria.

MSS SP85, “Cast Iron Globe & Angle Valves”
The primary design document for cast iron globe valves also contains testing procedures and acceptance criteria.