Valve Standard Reference
EN 593
EuropeanIndustrial Valves — Metallic Butterfly Valves
EN 593 is the European standard governing the design, manufacture, materials, and testing of metallic butterfly valves for industrial service.
Overview — EN 593
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.
Scope
Applies to metallic butterfly valves DN 40 to DN 2000 in pressure ratings PN 2.5 through PN 40. Covers concentric (rubber-seated), double-offset, and triple-offset designs in wafer, lug, and double-flanged configurations.
Applicable Valve Types
Butterfly Valves — concentric rubber-seated
Butterfly Valves — double-offset high-performance
Butterfly Valves — triple-offset metal-seated
Applicable Pressure Classes
Key Requirements — EN 593
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 — EN 593
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
Documentation Required for EN 593 Compliance
EN 593 compliance declaration
EN 10204 3.1 or 3.2 Material Test Reports
PED Declaration of Conformity (for CE marking)
Pressure test certificate
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