ANSI/MSS SP-134-2025

Valves for Cryogenic Service, Including Requirements for Body/Bonnet Extensions

This Standard Practice covers additional requirements for material, design, dimensions, fabrication, non-destructive examination, and pressure testing of metallic valves intended for service at cryogenic temperatures. Unplanned non-cryogenic events, such as auto-refrigeration during gas blow-down events where low temperatures may result, are outside the scope of this document. This Standard Practice applies to cryogenic gate, globe, butterfly, ball, and check valves, and may be used in conjunction with other valve-specific standards; including the following identified in this Standard Practice as a parent standard: ASME B16.34, Valves – Flanged, Threaded, and Welding End ; API Std 594, Check Valves: Flanged, Lug, Wafer and Butt-welding ; API Spec 6D, Specification for Valves ; API Std 600, Steel Gate Valves – Flanged and Butt-welding Ends, Bolted Bonnets ; API Std 602, Gate, Globe, and Check Valves for Sizes DN 100 (NPS 4) and Smaller for the Petroleum and Natural Gas Industries ; API Std 603, Corrosion-resistant, Bolted Bonnet Gate Valves – Flanged and Butt-welding Ends ;API Std 608, Metal Ball Valves – Flanged, Threaded and Welding Ends ; API Std 609, Butterfly Valves: Double-flanged, Lug- and Wafer-type, and Butt-welding Ends ; API Std 623, Steel Globe Valves- Flanged and Butt-welding Ends, Bolted Bonnets.