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ASME B16.34-2025

Valves — Flanged, Threaded and Welding End
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ASME B16.34-2025

Valves — Flanged, Threaded and Welding End

PUBLISH DATE 2025
PAGES 43
ASME B16.34-2025

Purpose of ASME B16.34-2025

ASME B16.34-2025, titled Valves — Flanged, Threaded, and Welding End, is a standard developed and published by the American Society of Mechanical Engineers (ASME). Its primary purpose is to establish minimum requirements for the design, materials, manufacturing, testing, and inspection of valves with flanged, threaded, or welding end connections used in pressure piping systems. The standard covers a wide range of valve types, including gate, globe, check, ball, and butterfly valves, ensuring safety, reliability, and performance under specified pressure and temperature conditions. It aims to promote standardization, compatibility, and safety in valve applications, reducing risks such as leaks, pressure failures, or material degradation in critical systems.

Typical Use

ASME B16.34-2025 is typically applied in the design, procurement, installation, and maintenance of valves in industries such as oil and gas, chemical processing, power generation, water treatment, and HVAC. Common applications include:

  • Process piping systems: Controlling flow in refineries, petrochemical plants, or pipelines.
  • Power plant operations: Managing steam, water, or gas flow in boilers and turbines.
  • Water and wastewater systems: Regulating flow in treatment plants or distribution networks.
  • HVAC and building services: Handling fluids in heating and cooling systems for commercial or industrial facilities.

Engineers, manufacturers, and inspectors use the standard during project phases to:

  • Select valve materials and ratings (e.g., carbon steel, stainless steel, or alloys) based on pressure-temperature ratings and service conditions.
  • Design valve components, including body, bonnet, and end connections, to meet wall thickness and structural integrity requirements.
  • Specify fabrication and testing procedures, such as non-destructive examination (NDE) or pressure tests (hydrostatic or pneumatic), to ensure leak-tightness and performance.
  • Verify compliance with standards through inspection and certification, ensuring valves meet designated pressure classes (e.g., Class 150 to 4500).

The standard is often used in conjunction with other ASME codes, such as B31.3 for process piping or B16.5 for flanges, and is referenced in project specifications, procurement contracts, and regulatory requirements. The 2025 edition includes updates such as revised pressure-temperature ratings, new material specifications, and clarifications on testing protocols, reflecting advancements in valve technology and industry practices.

SDO ASME: American Society of Mechanical Engineers
Document Number B16.34
Publication Date May 30, 2025
Language en - English
Page Count 43
Revision Level
Supercedes
Committee
Publish Date Document Id Type View
May 30, 2025 ASME B16.34-2025 Revision