Nuclear Valve Standards Update: What Engineers Should Track
The Short Answer Nuclear valve standards evolve through code revisions, regulatory updates, and industry guidance, and engineers should track them […]
Industry News
Valve Standards
Valve standards define the design, materials, testing, and pressure-temperature ratings that govern how valves are built and verified, giving engineers a common language across suppliers. This tag gathers articles that explain the role of major valve standards, how pressure classes and ratings are applied, and how to read a valve’s specification. Content covers the difference between design standards and end-connection standards, material requirements, and inspection and testing expectations, with practical guidance for purchasing and quality control. Written for engineers and buyers who need to specify or verify valves against recognized standards.
Valve Standards & Specifications
MSS SP-70 vs API 599: Reading Valve Standards for Procurement and Testing
The Short Answer MSS SP-70 and API 599 are two industry standards that buyers reference when procuring industrial valves, but […]
Glossary
RF vs RTJ Valve Flange: Choosing the Right Face Type for Your Joint
The Short Answer RF (raised face) and RTJ (ring-type joint) are two flange face designs used to seal the bolted […]
Valve Standards & Specifications
EN 593 vs API 609: Two Butterfly Valve Standards, One Product Category
The Short Answer EN 593 and API 609 are both butterfly valve standards, but they come from different worlds. EN […]
Glossary
Valve End Connections Explained: Flanged, Threaded, Welded, Wafer, Clamp
The Short Answer Valve end connections are the ways a valve attaches to its piping, and the choice between flanged, […]
Valve Standards & Specifications
MSS SP-67 vs API 609: Two Butterfly Valve Standards, Two Service Levels
The Short Answer MSS SP-67 and API 609 are two standards that cover butterfly valves, and the difference is scope […]
Glossary
Valve Leakage Classes Explained: Matching the Test Rate to the Service
The Short Answer Valve leakage classes are the acceptance levels that define how much a valve may leak across the […]
Glossary
DN vs NPS Valve Size: The Nominal Designations Behind Metric and Inch Piping
The Short Answer DN and NPS are two ways of naming valve and pipe sizes. DN (diameter nominal) is the […]
Valve Standards & Specifications
China Valve Standards vs ASME/API: Dimensions, Ratings and What Buyers Must Check
The Short Answer Chinese valve standards (GB series) and international standards (ASME, API, ISO) cover similar products but differ in […]
Valve Standards & Specifications
PN vs Class Valve Pressure Rating: What the Numbers Mean and How They Compare
The Short Answer PN and Class are two different ways of stating a valve’s pressure rating, and they are not […]
Valve Standards & Specifications
ASME B16.5 vs B16.47 Flanges: Sizes, Series and How to Choose
The Short Answer ASME B16.5 and ASME B16.47 are two different flange standards that cover different size ranges. B16.5 is […]
Valve Standards & Specifications
MSS SP-72 vs API 608: Which Ball Valve Standard Fits Your Specification
The Short Answer MSS SP-72 and API 608 are two standards that cover flanged and butt-welding end ball valves, and […]
Valve Standards & Specifications
ANSI vs API Valve Standards: Who Writes the Rules and Which One Applies
ANSI vs API Valve Standards: Who Writes the Rules and Which One Applies Anyone who has read a valve data […]
Valve Standards & Specifications
Class 300 vs Class 600 Valve: Matching the Rating to the Service
Class 300 vs Class 600 Valve: Matching the Rating to the Service When a piping spec says “Class 300” or […]
Valve Standards & Specifications
API 602 vs API 603: Two Small-Bore and Cast Valve Standards Explained
API 602 vs API 603: Two Small-Bore and Cast Valve Standards Explained The Short Answer: API 602 covers compact, bolted […]
Valve Standards & Specifications
Class 150 vs Class 300 Valve: What the Rating Really Means
Class 150 vs Class 300 Valve: What the Rating Really Means The Short Answer: Class 150 and Class 300 are […]
Valve Standards & Specifications
Valve Pressure Classes Explained: From Class 150 to Class 2500
Valve Pressure Classes Explained: From Class 150 to Class 2500 When you read a valve datasheet or a piping specification, […]
Valve Standards & Specifications
API 6D vs API 600: Which Standard Applies to Your Valve?
The Short Answer API 600 covers bolted bonnet steel gate valves for refinery and general industrial service. API 6D covers […]
Valve Standards & Specifications
BS 1873: Flanged Steel Globe Valves Explained
Quick Answer BS 1873 is the British Standard for flanged steel globe valves for the petroleum, petrochemical, and allied industries. […]
Valve Standards & Specifications
API 602: Compact Steel Gate Valves Explained
Quick Answer API 602 is the American Petroleum Institute specification for compact steel gate, globe, and check valves for petroleum […]
Valve Standards & Specifications
API 6D: The Standard for Pipeline Valves Explained
Quick Answer API 6D is the American Petroleum Institute standard for pipeline valves: ball, gate, plug, and check valves for […]
Drawings & Calculations
How to Read Valve Symbols in P&ID Diagrams
Quick Answer: How to Read Valve Symbols in P&ID Diagrams Valve symbols on a P&ID combine three elements: the basic […]
Valve Standards & Specifications
Valve Leakage Testing: API 598 vs. ISO 5208 Compared
Quick Answer: API 598 vs. ISO 5208 for Valve Testing API 598 and ISO 5208 both define shell and seat […]
Valve Standards & Specifications
API 609: The Standard for Butterfly Valves Explained
Quick Answer: What Is API 609 and When Does It Apply? API 609 is the American Petroleum Institute standard for […]
Glossary
What Is a Valve Pressure Class? Understanding Class 150, 300, and 600
The Short Answer A valve’s pressure class (Class 150, 300, 600, 900, 1500, 2500) is a rating designation from standards […]