en 593 butterfly valve Description
EN 593 is a general technical standard for butterfly valves formulated by the European Union. It specifies the design criteria, material requirements, manufacturing process, performance testing and dimensional specifications of butterfly valves in industrial applications. It is the core basis for butterfly valve products in the European market to obtain CE certification. This standard applies to metal butterfly valves, covering centerline and double eccentric structure types.
Main structural features
Design specifications
Double eccentric or centerline sealing structure is adopted, and the valve body flange connection dimensions follow EN 1092-2 (flange standard) and ISO 5211 (top drive device interface standard);
The structural length complies with the EN 558-1 series (such as 13 series or 14 series).
Material requirements
Valve body: Common materials include ductile iron (such as QT450-10), stainless steel (SS304), etc., and the surface needs to be treated with epoxy spray or paint for corrosion protection; Seal assembly: The sealing ring material can be EPDM (temperature resistance -10°C to 120°C) or NBR (temperature resistance -10°C to 82°C); Valve shaft and butterfly plate: 20Cr13 stainless steel or ductile iron, some models are welded with stainless steel to enhance corrosion resistance. Performance indicators
Nominal pressure range: DN80-DN1200 is 16bar, DN1400-DN2400 is 10bar; Sealing performance test must meet EN 12266-1 standard (valve seat leakage level requirements).
en 593 butterfly valve specification
| Product description | EN 593 butterfly valve |
| Nominal diameter | 3"--24" |
| Operating temperature | -196°C -- 700ºC according to requirement |
| Pressure Rating | SME B16.34 Class 150 & 300 Range, API 609 Class 150 & 300 Range |
| Design standard | EN593, API609 Cat.B, ASME 16.34 |
| Body type | Wafer, Lugged and Double Flanged short & long |
| Body/Disc | ASTM A216 WCB or ASTM A351 CF8M |
| Seat | tainless steel type 316 with graphite laminate |
| Operation method | Handle, worm, motor-drive unit, pneumatic drive unit |
| Application fields | The triple offset butterfly valves are executed with a metal to metal seat designed to ensure perfect tightness in steam, gas, chemical, petrochemical and cryogenic applications |
en 593 butterfly valve
Applications
Industrial Field
Medium cutoff and regulation in chemical processes (such as corrosive liquids and gases);
Water treatment systems (municipal water supply, sewage treatment).
Adaptation to special working conditions
High temperature working conditions: The sealing ring material supports a short-term 120°C environment (EPDM);
Clamp installation requirements: Suitable for pipeline layouts with limited space.
Relevance to other standards
EN 593 is often used in conjunction with the following standards:
EN 12266-1: used to verify sealing performance;
EN 1092-2: standardize flange connection dimensions;
ISO 5211: defines the top flange drive interface.
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