ISO 15761:2020

Overview

ISO 15761:2020 defines requirements for compact steel gate, globe and check valves for the petroleum and natural gas industries in sizes up to DN 100 (NPS ¼ to 4). The standard covers dimensional, material, design, testing, marking and inspection requirements for valves used in high-integrity process and piping systems. It aligns with common industry practice (e.g., API 602 style compact valves) and references flange and thread standards for end connections.

Key topics and technical requirements

• Scope and sizes: Applicable to nominal sizes DN 8, 10, 15, 20, 25, 32, 40, 50, 65, 80 and 100 (NPS ¼ - 4).
• Pressure designations: PN 16, 25, 40, 63, 100, 250, 400 and ASME Classes 150, 300, 600, 800, 1500 and 2500 (Class 800 is noted as a common intermediate class for compact socket-weld and threaded valves).
• Valve types and stem styles: Gate, globe and check valves with outside screw & yoke (OS&Y) and inside screw rising stem (ISRS) configurations (size and pressure limits specified).
• End connections: Socket-welding, threaded, flanged (EN 1092-1, ASME B16.5), and butt-welding ends; tapered pipe threads per ISO 7-1 or ASME B1.20.1.
• Bonnet and body construction: Bolted, welded or threaded bonnets (including union-nut options for limited pressure classes), body seat openings, extended-body options (DN 15–50 for certain classes).
• Bellows assemblies: Requirements for bellows stem seal construction and type testing (annexes cover bellows design and testing).
• Materials and trim: Material selection and combinations are addressed; trim materials and non-trim materials specified in clauses and informative annexes.
• Testing and inspection: Comprehensive pressure and leakage testing (shell tests, closure leakage, backseat, fugitive emission testing) and inspection provisions (see ISO 5208 referenced).
• Marking and documentation: Body marking, identification plates, weld fabrication marking and purchaser information requirements.

Practical applications and users

ISO 15761:2020 is intended for:

• Valve manufacturers designing compact steel valves for oil & gas service
• EPC contractors and plant designers specifying small-bore process valves
• Procurement, quality assurance and inspection teams requiring standardized acceptance criteria
• Maintenance and reliability engineers selecting replacements or upgrades for pipeline, upstream, midstream and downstream installations Typical applications include onshore and offshore process piping, pressure-retention systems, and utility and instrument hookups where compact, high-pressure steel valves are needed.

Related standards (normative/informative)

• EN 1092-1 (flanges, PN)
• ASME B16.5 (flanges)
• ISO 7-1 / ASME B1.20.1 (tapered pipe threads)
• ISO 5208 (valve pressure testing)
• ISO 5752 (face-to-face dimensions)
• Additional welding and testing standards (listed in Clause 2 and annexes)

Keywords: ISO 15761:2020, steel gate globe check valves, DN 100, petroleum and natural gas, compact valves, PN classes, ASME classes, socket welding, threaded ends, bellows stem seal, valve testing.