EN 593 Butterfly Valves
What EN 593 requires for butterfly valves — applicability, key and testing requirements, the alternative standards, and compliant supply with full certification.
What does EN 593 require for butterfly valves?
EN 593 (Industrial Valves - Metallic Butterfly Valves, European Committee for Standardization (CEN)) sets the design, material and testing requirements for butterfly valves in its scope. EN 593 is the European standard governing the design, manufacture, materials, and testing of metallic butterfly valves for industrial service. It covers face-to-face dimensions, pressure-temperature ratings, seat leakage classifications, and testing procedures. EN 593 is mandatory for butterfly valves supplied into European Union projects and is referenced alongside PED 2014/68/EU for pressure equipment in the EU.
Applicable Pressure Classes
Key Requirements
- Face-to-face dimensions per EN 558 Series 13 and 20
- Four leakage rate classes: A (zero), B, C, D per EN 12266
- Pressure-temperature ratings per EN 1092-1 flanges
- Body material specifications per EN 1092-1 PN ratings
- Disc and seat material combinations specified per fluid and temperature
- Shaft and bearing material requirements to prevent galvanic corrosion
- Anti-blowout shaft design required for all sizes
- CE marking required for PED compliance (Article 4 for DN > 25 and PS > 0.5 bar)
Testing Requirements
- Shell test per EN 12266 Part 1: 1.5× PN rating
- Seat leakage test per EN 12266 Part 1: 1.1× PN rating
- Leakage rate A, B, C, or D as specified
Alternative Standards for Butterfly Valves
Other standards that also govern butterfly valves — useful for spec cross-acceptance.
Related Standards
Connected Engineering
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