SIST EN ISO 10434:2020 PDF

Overview

EN ISO 10434:2020 - "Bolted bonnet steel gate valves for the petroleum, petrochemical and allied industries" - defines requirements for a heavy‑duty series of bolted‑bonnet steel gate valves used in refineries and related process plants. The standard covers valve constructions that require full‑port openings, heavy wall sections and large stem diameters to resist corrosion, erosion and severe service conditions. It supersedes EN ISO 10434:2004 and aligns with international valve practice.

Key topics and requirements

The standard sets out technical requirements across design, materials, testing and marking. Major elements include:

• Valve features covered

  • Bolted bonnet construction
  • Outside screw and yoke (OS&Y)
  • Rising stems and non‑rising handwheels
  • Single or double gate designs
  • Wedge or parallel seating
  • Metallic seating surfaces (trim)
  • Flanged or butt‑welding ends

• Sizes and pressure ratings

  • Nominal sizes DN 25–600 (NPS 1–24)
  • Pressure Class designations: 150, 300, 600, 900, 1500, 2500
  • Pressure PN designations: 16, 25, 40, 63, 100, 160, 250, 400

• Design and manufacturing

  • Minimum body/bonnet wall thicknesses, body and bonnet dimensions, bonnet‑to‑body joint requirements
  • Gate, stem, stem‑nut and yoke design; stem‑to‑wedge connection requirements
  • Packing, packing box and bolting requirements
  • Auxiliary connections and operation considerations

• Materials

  • Requirements for body, bonnet and trim materials
  • Welding rules for fabrication and repair

• Testing, inspection and marking

  • Shell and closure tightness tests, optional backseat and fugitive emission testing
  • Inspection and examination scope, site inspection guidance
  • Body and identification plate marking, legibility and special marking for unidirectional valves

Applications and users

EN ISO 10434:2020 is intended for:

• Petroleum refinery, petrochemical and allied industries
• Valve manufacturers designing heavy‑duty bolted bonnet gate valves
• Procurement engineers specifying valves for severe service (corrosive/erosive mediums)
• Inspection, QA and commissioning teams responsible for testing and marking compliance It is especially relevant where full‑port flow, high pressure ratings and rugged construction are required.

Related standards

• ISO 10434:2020 is technically aligned with industry valve practices and noted to be parallel to API Standard 600 (American Petroleum Institute).
• Users should reference applicable piping, flange and material standards and any national implementations (EN adoption by CEN members).

Keywords: EN ISO 10434:2020, bolted bonnet steel gate valves, petroleum, petrochemical, gate valves standard, DN, NPS, pressure class, PN, flanged ends, butt‑welding ends, metallic seating, API 600.