ISO 19240:2017

Overview

ISO 19240:2017 - Industrial valves - Lined metal quarter turn and check valves for chemical process and related industries - defines design, dimensional, material, fabrication and production testing requirements for lined metal quarter-turn valves (plug, butterfly, ball) and check valves used in corrosive and chemical process applications. The standard covers flanged, wafer and wafer-lug body types for nominal sizes DN 15–1200 (NPS 1/2–48) and pressure designations PN 10, 16, 25, 40 and Class 150, 300.

Key topics and technical requirements

• Valve types covered: Lined metal plug, butterfly, ball (quarter-turn) valves and check valves.
• Sizes & ratings: DN 15 to DN 1200 (NPS 1/2 to NPS 48); PN 10/16/25/40 and ASME Class 150/300.
• Materials & linings: Valve linings shall be fluoropolymer or polymer materials; lining thickness minimum 2.5 mm on all media-wetted surfaces and end flange sealing faces.
• Liner anchoring: Liners must be mechanically anchored to body and closure elements to resist axial and radial flow forces.
• Pressure/temperature ratings: Assemblies must comply with pressure/temperature tables referenced to EN/ASME standards; limitations due to lining materials (e.g., fluoropolymers) must be marked.
• Design & construction details: Body wall thickness, shaft design (blow-out proof), continuation of shaft lining above primary shaft seal, face-to-face dimensions per ISO 5752, and flange compatibility with EN 1092 and ASME B16.x standards.
• Testing & inspection: Lining tests (visual, porosity, anti‑static), pressure testing (ISO 5208/EN 12266), allowable leakage rates, and additional examinations as required.
• Marking: PN-designated valves marked per ISO 5209; Class-designated valves per ASME B16.34. Required markings include differential pressure and any application restrictions.

Applications and who uses it

ISO 19240:2017 is intended for use in the chemical process and related industries where corrosion-resistant, lined metal valves are required. Typical users:

• Valve manufacturers and designers for product specification and compliance
• Plant engineers and piping designers selecting lined valves for corrosive services
• Procurement and specification writers creating tender documents and datasheets
• Quality, inspection and testing teams verifying production testing and marking
• EPC contractors and maintenance teams in chemical, petrochemical, pharmaceutical, water treatment and related facilities

Related standards

Key referenced standards for dimensions, testing and ratings:

• ISO 5752 (face-to-face dimensions)
• ISO 5208 (pressure testing of metallic valves)
• ISO 5209 (marking)
• EN 1092 series (flanges)
• EN 12516 series / ASME B16.34 (pressure/temperature and shell strength)
• EN 12266 (testing procedures)

ISO 19240:2017 provides a practical framework for specifying, manufacturing and testing lined metal quarter-turn and check valves to ensure compatibility, safety and performance in corrosive process environments.