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18" Double Flanged Butterfly Valve with Super Duplex Disc and Vulcanized Rubber Seat | ISO 5211 Top Flange

Tianjin Worlds Valve Co., Ltd. supplies an 18-inch (DN450) double flanged butterfly valve built for corrosive and demanding service conditions. The valve disc is manufactured from super duplex stainless steel, identified by the marking “5A” – a material known for its high strength and excellent resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking, making it ideal for seawater, brine, chemical processing, and offshore applications. The seat is a vulcanized rubber seat, meaning the elastomer is chemically bonded directly to the valve body during the curing process. This construction eliminates any potential leakage path between the seat and the body. The seat is not field-replaceable. Depending on the application, customers can select the seat material from a wide range of elastomer options – for example, EPDM (for water and mild chemicals), NBR (for oil-containing media), Viton (FKM) (for aggressive chemicals and higher temperatures), or other materials as required to suit specific media and temperature conditions.
  • CBF02-TF01

  • OEM| ODM | WDS

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Introduce:

18" Double Flanged Butterfly Valve with Super Duplex Disc and Vulcanized Rubber Seat | ISO 5211 Top Flange

Tianjin Worlds Valve Co., Ltd. – Your Reliable Source for Durable, Cost-Effective Flow Control

CBF02-TF01-Operation and Maintenance Manual DOWNLOAD

18 Double Flanged Butterfly Valve with Super Duplex Disc and Vulcanized Rubber Seat ISO 5211 Top Flange-1.png

Customization Overview

 

All major parameters of this valve are customizable to meet specific project requirements:

  • Body material: Ductile iron (GGG40) is offered as a standard option, with an epoxy coating applied for external corrosion protection. The coating color is customer-selectable – any RAL or custom color can be specified. Alternative body materials such as carbon steel (WCB), stainless steel (CF8, CF8M), or other alloys are also available upon request.

  • Disc material: Super duplex (5A) as described; other disc materials can be supplied if specified.

  • Seat elastomer: EPDM, NBR, or Viton – customer choice.

  • Pressure rating: No fixed default – each order is manufactured to the required rating, such as PN10, PN16, PN25, Class 150, Class 300, or others.

  • Flange standard: Conforms to customer specifications (e.g., EN 1092, ANSI B16.5, AS2129, etc.).

  • Size range: 18 inches (DN450) as described; other sizes from DN50 up to DN2000 are also available.

18 Double Flanged Butterfly Valve with Super Duplex Disc and Vulcanized Rubber Seat ISO 5211 Top Flange (2).png

Design Features

  • Double flanged body: Provides a rigid, bolted connection on both pipeline sides, offering excellent mechanical stability for permanent installations, high-vibration lines, and dead-end service.

  • Vulcanized rubber seat: The elastomer is permanently bonded to the body during vulcanization, creating a leak-proof seal without removable components.

  • ISO 5211 top flange: The valve's upper flange is machined to ISO 5211 standards, allowing direct mounting of electric, pneumatic, or hydraulic actuators without custom adapters, simplifying automation integration.

 

18 Double Flanged Butterfly Valve with Super Duplex Disc and Vulcanized Rubber Seat ISO 5211 Top Flange-1 (2).png

Standard:

Parameter

Available Options

Valve type

 Double flanged butterfly valve(CBF02-TF01)

Nominal size

18 inches (DN450) – other sizes available

Disc material

Super duplex stainless steel (5A)

Seat type

Vulcanized rubber seat (non‑replaceable)

Seat material

 EPDM, NBR, or Viton (customer selects)

Body material

 Ductile iron (with epoxy coating); WCB, CF8, CF8M also available

Epoxy coating color

Customer-selectable (any RAL or custom color)

Pressure rating

Custom (PN10, PN16, Class 150, etc.)

Flange standard

Custom (EN 1092, ANSI B16.5, etc.)

Top flange

ISO 5211(customer selects)

Temperature range

Depends on chosen seat material

Typical media

Seawater, brine, chemicals, oil, water, etc.

 

18 Double Flanged Butterfly Valve with Super Duplex Disc and Vulcanized Rubber Seat ISO 5211 Top Flange (1).png

 

Important Note on Seat Serviceability

 

Because the valve is equipped with a vulcanized rubber seat, the elastomer is permanently bonded to the body and cannot be replaced in the field. For applications requiring a replaceable seat design, please contact our technical team to discuss alternative valve configurations.

 

Why Choose Tianjin Worlds Valve?

 

1. We manufacture valves strictly according to customer specifications, while also providing professional recommendations on material selection and installation to ensure optimal performance.

2. Our experience with super duplex (5A) and other high-grade alloys ensures proper material application for severe environments.

3. Full documentation, including material certificates and test reports, is provided with every order.

4. Our ISO 9001‑certified facility supports global export, with certifications such as CE, UKCA, WRAS, and ACS available upon request.

 

Butterfly Valve Manufacturers - Resilient Seated Double Flanged Butterfly Valve-3 (1).png

Conclusion:

We invite you to contact us for a competitive quotation or to arrange a visit to our factory. Our team is ready to discuss your project requirements, offer technical support, and demonstrate our manufacturing capabilities firsthand.  dekai@worldsvalve.com

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