SIST EN 1349:2011

SIST EN 1349:2011 is the Slovenian adoption of the European Standard for industrial process control valves, published by SIST. It specifies design and performance requirements, including materials, pressure/temperature ratings, dimensions, testing and marking, for control valves used in process control systems.

What does SIST EN 1349:2011 specify?

SIST EN 1349:2011 applies to industrial process control valves and sets the rules for their design, performance, testing, marking and transport preparation. It covers defined ranges of DN, PN and Class sizes, while excluding pinch valves and cast iron Class designated flanges.

The document is organized into clauses for scope, normative references, terms and definitions, symbols and abbreviations, requirements, test procedures, inspection, designation, and marking and preparation for transportation. It also includes an informative Annex ZA on the relationship with EU Directive 97/23/EC.

What are the key requirements of SIST EN 1349:2011?

SIST EN 1349:2011 focuses on the valve body, trim, dimensions, functional behaviour and verification tests. In practice, it tells manufacturers what to design, what to declare, and what to test before a valve is accepted.

• Design and sealing - Clause 5.1.1 requires a secondary seal when the shaft/stem seal uses a bellows seal. This matters because the valve must keep a backup sealing function in service.
• Material selection - Clause 5.1.2 ties shell material to EN 12516-1 or EN 12516-4, and says trim materials shall suit pressure, temperature, fluid and valve type. For buyers, this means material choice is part of the valve specification, not an afterthought.
• Pressure/temperature ratings - Clause 5.1.3 links ratings to the applicable flange or valve-body standards in Table 2. This is what keeps the valve matched to the piping system’s pressure and temperature envelope.
• Dimensions and end connections - Clause 5.1.4 uses EN 558 for face-to-face dimensions, EN 12982 for end-to-end dimensions, and Table 5 for body ends. In practice, this supports interchangeability and proper fit into the pipeline.
• Operation - Clause 5.1.5 says the actuator, and positioner if specified, shall be compatible with the valve performance and capable of the rated travel and dead band defined in EN 60534-4. This is important when selecting automation hardware.
• Functional performance - Clause 5.2 requires shell strength, flow coefficients, inherent flow characteristic and seat leakage to follow the cited EN 12516 and EN 60534 parts. Manufacturers must declare coefficients such as CV, KV, xT and FL, which are used for sizing and process calculations.
• Testing and inspection - Clauses 6 to 8 define hydrostatic shell strength and tightness tests, flow tests, seat leakage, rated travel, dead band and packing leakage, with mandatory and supplementary tests separated in Table 6. This gives a clear acceptance route for production and inspection.
• Marking and transport - Clause 10 requires marking to EN 19, with extra identification items where needed, and protects valve ends and flange faces during shipment. This matters for traceability and to avoid damage before installation.

What terms does SIST EN 1349:2011 define?

SIST EN 1349:2011 uses terminology aligned with EN 736 and EN 60534, with some valve-specific terms clarified in Clause 3.

• Control valve - A power-operated valve that changes fluid flow in response to a control signal by moving an obturator through an actuator.
• Globe control valve - A control valve with an obturator that moves perpendicular to the seat plane.
• Butterfly control valve - A control valve with a circular body and a rotary disk obturator supported by a shaft.
• Cage - A part in a globe control valve that surrounds the obturator and guides it, and may also help shape flow.
• Balanced trim - Globe valve trim designed to reduce static and dynamic fluid forces on the obturator-stem assembly.
• Leak-off connection - A piping connection used to detect, collect or inject fluid between two packing sets.
• Extension bonnet - A bonnet that extends the packing chamber away from the flow area.

Who uses SIST EN 1349:2011?

SIST EN 1349:2011 is used by valve manufacturers, actuator and positioner suppliers, purchasers, specifiers, inspectors and test laboratories. It is also relevant to quality managers and engineers in process industries who need a common basis for selecting, sizing, testing and accepting control valves.

In practice, manufacturers use it to design the valve, choose materials, define dimensions and mark the product. Purchasers and engineering staff use it to write valve data sheets and compare offers on a common technical basis. Inspection and testing teams use it for acceptance tests and routine verification.

What changed in SIST EN 1349:2011 from the previous edition?

SIST EN 1349:2011 supersedes EN 1349:2000. The introduction states that this edition is based on different parts of EN 60534, adds a basic series of face-to-face dimensions, adds other control valve types, aligns hydrostatic testing with EN 12266-1, and ties marking to EN 19 and EN 60534-5.

Which standards are used with SIST EN 1349:2011?

SIST EN 1349:2011 relies on several companion standards for terminology, dimensions, materials, testing and marking.

• EN 19 and EN 60534-5 - marking requirements.
• EN 558 and EN 12982 - face-to-face and end-to-end dimensions.
• EN 736-1, EN 736-2, EN 736-3 and EN 60534-1 - valve terminology and definitions.
• EN 1092-1, EN 1092-2, EN 1092-3, EN 1759-1, EN 1759-3, EN 12627, EN 12760, EN 10226-1, EN ISO 228-1, ASME B1.20.1 - body ends and thread/flange connection forms.
• EN 12266-1 - shell pressure tests and acceptance criteria.
• EN 12516-1, EN 12516-2, EN 12516-3, EN 12516-4 - shell strength and related material rules.
• EN 60534-2-1, EN 60534-2-3, EN 60534-2-4, EN 60534-2-5 - flow capacity, test procedures and flow characteristics.
• EN 60534-4 and EN 60534-9 - inspection, routine testing, dead band, packing leakage and step response.

What does the SIST EN 1349:2011 document contain?

SIST EN 1349:2011 contains the technical structure needed to specify and verify industrial process control valves. It includes tables for nominal sizes, pressure classes, reference standards, basic dimension series and test categories, plus clauses for terms, symbols, design, functional characteristics, tests, inspection, designation, marking and transport protection.

The document is used for design review, procurement, testing and inspection. Annex ZA adds the PED correspondence needed when the valve falls under EU pressure equipment rules.