Industrial valves · Дисковый затвор Sarasin для ядерной отрасли: арматура повышенной безопасности
Sarasin Butterfly Valves for Nuclear Power: Technical Overview and Application
Sarasin Engineering Solutions: Butterfly Valves for the Nuclear Industry
Sarasin butterfly valves are precision shut-off and control valves designed for critically important systems in nuclear power. EV Group China engineers supply equipment designed for operation in conditions of intense ionizing radiation, high temperature gradients, and chemically active environments, where standard valves cannot guarantee the required safety class and durability.
Engineering purpose and operational functions
Precision flow control: Sarasin valves ensure high-precision modulation of liquid and gaseous media flows, which is a fundamental requirement for maintaining the stability of technological processes in heat exchange circuits and emergency core cooling systems (ECCS) at NPPs.
Absolute tightness: The design of the sealing units, including the seat and disc, ensures tightness class "A" according to ISO 5208, completely excluding leakage of radioactive or toxic media. This guarantees compliance with the strictest radiation and industrial safety standards.
Emergency shutdown function: High-speed actuators provide instant flow shut-off to isolate emergency sections of pipelines. This function is critically important for localizing abnormal situations and protecting key equipment of the reactor plant.
Sarasin valve design
Butterfly Valves:
- 90° disc rotation ensures minimal response time, which is critical for rapid isolation systems.
- The hydrodynamically optimized disc shape reduces pressure losses and cavitation effects in technical water supply circuits.
- The compact wafer design simplifies integration into pipelines with high component density, characteristic of NPP containment zones.
Double Eccentric Butterfly Valves:
- The double eccentricity of the disc's rotation axis eliminates friction between the disc and the seat at the moment of closing, which significantly increases the service life of the seal.
- Ensures stable tightness under cyclic thermal shocks and high operating temperatures.
- Preferred for use in main steam line systems, steam generator blowdown circuits, and special water treatment systems.
Application in energy circuits
| Medium | Operating features |
|---|---|
| Cooling circuit water | Flow modulation in technical water supply circuits of critical consumers (TWS) and intermediate circuits. |
| High-pressure steam | Regulation and shut-off of steam flows supplied to turbogenerators. |
| Chemical reagent solutions | Precise dosing of boric acid, hydrazine, and other reagents in water treatment and special water purification systems. |
| Radioactive media | Body and seals made of radiation-resistant alloys (Inconel, Hastelloy) for working with radioactive media. |
Technical specifications
- Nominal diameter (DN): 50–1000 mm.
- Maximum pressure (PN): up to 100 bar.
- Temperature range: up to 600 °C.
- Tightness class: "A" according to ISO 5208 (zero leakage).
- Materials: Inconel, Hastelloy, 316L steel, carbon special alloys.
- Actuators: electromechanical, pneumatic, hydraulic, manual backups.
Frequently Asked Questions (FAQ)
What is the main advantage of Sarasin valves for NPPs over standard valves?
The key difference is qualification for use in the nuclear industry. This includes tests for radiation resistance, seismic resistance, and preservation of mechanical properties of materials under prolonged exposure to ionizing radiation in accordance with RCC-M/ASME Section III standards.
Is it possible to use Sarasin valves in the oil and gas and chemical industries?
Yes. Thanks to the use of corrosion-resistant alloys (Hastelloy, Inconel) and proven reliability, they are successfully used at oil refining and chemical facilities for working with aggressive media at high pressures and temperatures.
What standards confirm the quality of Sarasin products?
The products are certified for compliance with key industry standards: ASME Section III (for NPP components), RCC-M, RCC-E, and the quality management system complies with ISO 9001 and NQA-1.
Sarasin Valve Supply from EV Group China
EV Group China is an authorized technological partner and supplier of Sarasin valves for nuclear power projects. Our engineers provide comprehensive technical support, including equipment selection based on data sheets and design specifications, and also organize international logistics. For technical consultation and ordering Sarasin butterfly valves, please contact our engineering department.