Valve Standards & Specifications

The Short Answer EN 558 and ASME B16.10 are both standards that define face-to-face and end-to-end dimensions for valves, but […]

The Short Answer PED and ASME are two different frameworks that a valve can be claimed to meet, and they […]

The Short Answer ASME B31.1 and B31.3 are two different power and process piping codes published by ASME, and the […]

The Short Answer DIN 3352 and API 600 are both gate valve standards, but they come from different pressure-rating systems […]

The Short Answer MSS SP-6 and MSS SP-25 are both MSS standard practices for valves, but they do completely different […]

The Short Answer MSS SP-70 and API 599 are two industry standards that buyers reference when procuring industrial valves, but […]

The Short Answer EN 593 and API 609 are both butterfly valve standards, but they come from different worlds. EN […]

The Short Answer MSS SP-67 and API 609 are two standards that cover butterfly valves, and the difference is scope […]

The Short Answer Chinese valve standards (GB series) and international standards (ASME, API, ISO) cover similar products but differ in […]

The Short Answer PN and Class are two different ways of stating a valve’s pressure rating, and they are not […]

The Short Answer ASME B16.5 and ASME B16.47 are two different flange standards that cover different size ranges. B16.5 is […]

The Short Answer MSS SP-72 and API 608 are two standards that cover flanged and butt-welding end ball valves, and […]

ANSI vs API Valve Standards: Who Writes the Rules and Which One Applies Anyone who has read a valve data […]

Class 300 vs Class 600 Valve: Matching the Rating to the Service When a piping spec says “Class 300” or […]

API 602 vs API 603: Two Small-Bore and Cast Valve Standards Explained The Short Answer: API 602 covers compact, bolted […]

Class 150 vs Class 300 Valve: What the Rating Really Means The Short Answer: Class 150 and Class 300 are […]

Valve Pressure Classes Explained: From Class 150 to Class 2500 When you read a valve datasheet or a piping specification, […]

The Short Answer API 600 covers bolted bonnet steel gate valves for refinery and general industrial service. API 6D covers […]

Quick Answer BS 1873 is the British Standard for flanged steel globe valves for the petroleum, petrochemical, and allied industries. […]

Quick Answer API 602 is the American Petroleum Institute specification for compact steel gate, globe, and check valves for petroleum […]

Quick Answer API 6D is the American Petroleum Institute standard for pipeline valves: ball, gate, plug, and check valves for […]

Quick Answer: API 598 vs. ISO 5208 for Valve Testing API 598 and ISO 5208 both define shell and seat […]

Quick Answer: What Is API 609 and When Does It Apply? API 609 is the American Petroleum Institute standard for […]

The Short Answer A fire-safe valve is one that has been fire-tested and certified to limit leakage through the seat […]