The Bray 3-Cx resilient-seated butterfly valve is a wafer- or lug-style isolation and control valve for DN 50 to 600, suitable for service conditions up to 16 bar and from -20°C to 121°C. Its body is made of low-temperature ductile cast iron, with an EPDM seat and stainless steel or duplex stainless steel disc, making it suitable for water, wastewater, gas, vacuum, acid, and chemical pipelines. The ISO 5211 top flange facilitates actuator mounting, making it suitable for industrial water treatment, chemical processing, and safety-interlock automatic shutoff loops.
3-Cx resilient-seated butterfly valve lug-style product image
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Bray 3-Cx Resilient-Seated Butterfly Valve
Rubber-lined butterfly valve for water and chemical pipelines, available with wafer or lug connections
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Specifications
- Size Range
- DN 50 to DN600
- Operating Temperature Range
- -20°C to 121°C
- Maximum Allowable Operating Pressure
- 16 bar
- Body Type
- Wafer, lug
- Body Material
- Low-temperature ductile iron (EN 5.3103)
- Disc Material
- Stainless steel (EN 1.4408) / duplex stainless steel (EN 1.4470)
- Stem Material
- Stainless steel (EN 1.4542)
- Seat Material
- EPDM
- Flange Drilling Standard
- EN 1092-1 PN 10 & PN 16
- Top Flange Standard
- ISO 5211
- Face-to-Face Standard
- EN 558 Series 20
- Leakage Test Rating
- EN 12266-1 Grade A
- Safety Integrity Level
- IEC 61508 SIL 3
- Explosion Protection Certification
- ATEX (2014/34/EU)
- Fugitive Emissions Standard
- ISO 15848-1 / TA-Luft VDI 2440
- Applicable Media
- Gas, Vacuum, Water, Wastewater, Acids, Chemicals
- Stem Design
- Blowout-proof
- Stem Bearings
- Upper and lower stem bearings reduce operating torque and improve reliability during high-frequency cycling
Application scenarios
Chemical Acid and Chemical Process Piping
For process piping handling acidic liquids and chemical media. Product documentation specifies compatible media including acids and chemicals, an EPDM vulcanized seat, and stainless steel or duplex stainless steel discs, with an operating temperature range of -20°C to 121°C and a maximum allowable operating pressure of 16 bar.
Industrial Wastewater Treatment Piping
For line isolation or control in industrial wastewater collection, transfer, and treatment units. Product documentation explicitly lists Wastewater as a compatible medium. The vulcanized seat, profiled disc sealing edge, and upper and lower stem bearings help achieve tight shutoff, reduce operating torque, and support frequent cycling.
Industrial Water Supply and Water Treatment Systems
For isolation and automated control in industrial water supply, purified water, or circulating water pipelines. This series is suitable for Water service, with sizes from DN 50 to 600. Wafer and lug-style bodies are available, flange drilling complies with EN 1092-1 PN 10 and PN 16, and the ISO 5211 top flange facilitates actuator mounting.
Industrial Gas and Vacuum Process Piping
For on/off isolation in industrial gas transfer and vacuum process piping. Product documentation explicitly lists Gas and Vacuum as compatible media. It uses a vulcanized seat and profiled disc sealing edge, has an EN 12266-1 Class A leakage test rating, and can be fitted with an actuator via the ISO 5211 top flange.
Safety Instrumented Interlock Automatic Shutdown Loops
For safety instrument-related piping loops requiring automatic shutdown. This series is IEC 61508 SIL 3 capable, uses an ISO 5211 top flange for actuator connection, and incorporates upper and lower stem bearings to reduce operating torque and improve reliability in high-cycle service.
Selection points
Vulcanized Seat and Profiled Disc Sealing Design
A vulcanized seat and profiled disc sealing edge provide bubble-tight shutoff, making the valve suitable for chemical processing and water treatment isolation duties requiring long service life and consistent sealing performance.
Upper and Lower Stem Bearing Support
Bearings at the upper and lower stem positions reduce operating torque and help improve operational reliability in high-cycle automated applications.
SIL 3 Capability and ATEX Explosion Protection Certification
The product offers IEC 61508 SIL 3 capability and complies with ATEX 2014/34/EU explosion protection certification requirements, making it suitable for applications requiring the relevant safety integrity and compliance basis for potentially explosive atmospheres.
Fugitive Emissions Standards Compliance
The product complies with ISO 15848-1 and TA-Luft VDI 2440 fugitive emissions standards, making it suitable for applications with defined control requirements for stem and valve fugitive emissions.
Installation & maintenance notes
Align Flanges and Keep the Disc Slightly Open
During installation, keep the disc slightly open and ensure that the pipeline flanges are aligned with sufficient clearance to prevent contact between the disc and adjacent flanges or piping, which could damage the vulcanized EPDM seat.
FAQ
How does the 3-Cx resilient-seated butterfly valve work?
This series uses a vulcanized seat, a profiled disc sealing edge, and stem bearings. Bubble-tight shutoff is achieved through sealing contact between the seat and disc, while relative movement between the disc and seat enables opening and closing, providing reliable flow control for gases, liquids, and chemical media. The specific operating principle should be confirmed based on the actual model and media conditions.
Which key parameters should be considered when selecting a valve from this series?
Consider the size range of DN50–DN600, temperature range of -20°C to 121°C, maximum allowable operating pressure of 16 bar, as well as the body type, leakage test rating, design standards, and material grades to ensure compatibility with the media, pressure, and temperature conditions. The specific configuration should be confirmed based on the actual model and application conditions.
What performance advantages does this valve offer in high-frequency switching applications?
The design uses a high-strength stem, bushings, and a low-friction sealing structure to reduce operating torque and improve reliability over high-cycle service. An antistatic design and digital identification further improve on-site maintenance and traceability efficiency. Specific performance should be confirmed based on the actual model.
Which standards-compliant features does this series offer?
The series complies with multiple standards and directives, including CE/UKCA, the Pressure Equipment Directive, the Machinery Directive, and ATEX. The leakage test rating is EN 12266-1 Grade A, the face-to-face dimensions comply with EN 558 Series 20, and marking is carried out in accordance with EN 19, DIN EN IEC 61406, DIN 91406, and other applicable requirements. The specific application should be confirmed based on the model.
How should the valve be installed and maintained to ensure sealing performance?
Installation should follow the alignment requirements for the wafer and lug configurations, ensuring compliant hole alignment on the upper and lower flanges and using the recommended gaskets and tightening torques. Routine maintenance should monitor the valve sealing condition, operating torque, and leakage. Where necessary, assess wear on the seat and disc. Specific details should be confirmed based on the actual model and media conditions.
Documents
Product Brochure - Cx Series Bray ComponentsProduct information · EnglishProduct Brochure - Cx Series Bray ComponentsProduct information · EnglishProduct Brochure - Cx Series in Bray ComponentsProduct information · EnglishProduct Brochure - Cx Line Nuestro ElementoProduct information · EnglishDeclaration of Conformity - EU-KonformitätserklärungProduct information · EnglishDeclaration of Conformity - Declaración de Conformidad de la UEProduct information · EnglishDeclaration of Conformity - EU Declaration of ConformityProduct information · EnglishDeclaration of Conformity - Déclaration UE De ConformitéProduct information · EnglishDeclaration of Conformity - Deklaracja Zgodności UEProduct information · EnglishIOM Manual - Resilient-Seated Butterfly Valve 3-CxManual · EnglishIOM Manual - uzavírací klapka s měkkým sedlem 3-CxManual · EnglishIOM Manual - Vanne Papillon À Siège Élastomère 3-CxManual · EnglishIOM Manual - Weichdichtende Absperrklappen 3-Cx.Manual · EnglishIOM Manual - Przepustnica z Uszczelnieniem Elastycznym 3-CxManual · EnglishIOM Manual - Válvula Mariposa Con Asiento Resiliente 3-CxManual · EnglishTechnical Sales Manual - Resilient-Seated Butterfly Valve 3-CxManual · EnglishTechnical Sales Manual - uzavírací klapka s měkkým sedlem 3-CxManual · EnglishTechnical Sales Manual - Vanne Papillon À Siège Élastomère 3-CxManual · EnglishTechnical Sales Manual - Weichdichtende Absperrklappe 3- Cx.Manual · EnglishTechnical Sales Manual - Przepustnica z Uszczelnieniem Elastycznym 3-CxManual · EnglishTechnical Sales Manual - Válvula Mariposa Con Asiento Resiliente 3-CxManual · EnglishDeclaration of Conformity - Déclaration UE De ConformitéProduct information · EnglishSales Data Sheet - Resilient-Seated Butterfly Valve 3-CxProduct information · EnglishSales Data Sheet - À Siège Élastomère 3-Cx.Product information · EnglishProduct Brochure - Cx Series Bray ComponentsProduct information · EnglishSales Data Sheet - Weichdichtend 3-Cx.Product information · EnglishSales Data Sheet - Z Uszczelnieniem Elastycznym 3-CxProduct information · EnglishSales Data Sheet - Asiento Blando 3-CxProduct information · English