GESTRA BB 1 – BB 2 Series Swing Check Valves

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GESTRA BB 1 – BB 2 Series Swing Check Valves

Type: Dual-Plate Wafer-Type Swing Check Valves
Size Range: DN 50 – DN 1200 (2″ – 48″)
Pressure Ratings: PN 6 / 10 / 16 / 25 / 40 | ASME Class 125 / 150 / 300
Mounting: Between flanges (wafer-type)
Flow Media: Liquids, gases, steam

🔧 Description
The GESTRA BB 1 and BB 2 Series Swing Check Valves are wafer-type dual-plate non-return valves engineered to prevent backflow in industrial pipelines. Featuring a center-guided twin-disc swing design, these valves offer low pressure loss, high reliability, and long-term performance even in demanding systems.

Their compact and lightweight construction makes them ideal for space-restricted installations. The valve body is centered between flanges and allows installation in horizontal or vertical flow (upward direction only for vertical). The dual-disc configuration ensures quick closure and reduced water hammer risk.

GESTRA BB 1 and BB 2 series are built in accordance with DIN EN 558-1, Series 16 (face-to-face length), and are available in both DIN and ASME flange standards.

🌍 Typical Applications
Industrial steam and condensate systems

Hot and chilled water networks

Chemical and petrochemical pipelines

HVAC and building services systems

Process engineering plants

Pump discharge lines

Utility and district heating systems

Compressed air and inert gas applications

💡 Key Benefits
✅ Dual-plate swing design minimizes water hammer and ensures fast shut-off

🔩 Wafer-type body enables compact installation between standard flanges

🔄 Horizontal and vertical mounting (upward flow) supported

💧 Very low pressure loss due to optimized disc geometry

🧱 Rugged construction for extended service life and operational safety

🌐 Available for DIN and ASME flanges, making it suitable for global installations

🔒 Tight sealing and reliable non-return function for steam, liquid, and gas media

📌 Technical Note
The BB 1 and BB 2 Series differ mainly in terms of body material, pressure class, and gasket options. Consult the GESTRA datasheet or contact us for precise model selection.

Engineered by GESTRA

GESTRA Dual-Plate Check Valves – Sealing Options and Special Configurations
GESTRA dual-plate check valves are available with metal-to-metal seat design for robust and reliable sealing in demanding conditions.
Alternatively, soft-seated versions are also available; however, attention must be paid to the temperature limits specific to the sealing material used.

The BB..G model comes standard with a soft seal made of EPDM (Ethylene Propylene Diene Monomer), offering excellent chemical resistance and sealing performance within defined temperature ranges.

🔧 Optional Features
Dampers are available for systems sensitive to waterhammer effects, helping to reduce pressure surges and increase system protection.

Internally plastic-lined body versions are suitable for potable water applications, ensuring hygienic and corrosion-resistant performance.

Internally rubber-lined body versions are designed for use in seawater applications, providing enhanced resistance against saline corrosion.

Types of GESTRA BB Series Check Valves

Material-Optimized Valve Variants for Demanding Applications
The GESTRA BB Series swing check valves are available in a range of material combinations and sealing configurations to meet the diverse needs of industrial fluid control. Each variant is optimized for specific media types, temperature limits, and corrosion resistance requirements.

BB: Standard model with metal-to-metal seat, designed for steam, gas, and water applications requiring robust sealing and durability.

BB..G: Soft-seated version equipped with EPDM sealing element, suitable for applications with lower temperature limits such as HVAC and potable water systems.

BB..D: Variant with integrated damper, engineered to mitigate waterhammer effects in systems with rapid flow reversals or long pipelines.

BB..P: Plastic-lined internal body surface, specifically developed for hygienic conditions and potable water installations.

BB..R: Rubber-lined internal body, providing excellent corrosion resistance for seawater, brine, or chemically aggressive fluids.

GESTRA Manufacturing Standards

GESTRA’s product portfolio is developed and manufactured in accordance with internationally recognized quality, design, and safety standards. This ensures that each valve, steam trap, and control device meets the rigorous demands of industrial applications worldwide.

🌍 Quality and Compliance
GESTRA production facilities operate under a certified ISO 9001 Quality Management System, ensuring consistent product quality and traceability. All products are tested in compliance with EN, DIN, and ASME standards where applicable.

🛠️ Design and Manufacturing Standards
EN ISO 9001 – Quality management system for design and production

EN ISO 14001 – Environmental management system (where applicable)

PED 2014/68/EU – Pressure Equipment Directive compliance

EN 558-1 – Standard face-to-face dimensions

EN 1092 / ASME B16.5 – Flange connection standards

EN 12266 / API 598 – Valve leakage and pressure test procedures

AD 2000 / TRD 421 – German pressure vessel codes for specific product groups

🔧 Traceability and Documentation
GESTRA products come with full technical documentation, including:

Material certificates (e.g. EN 10204 3.1)

Pressure and leakage test reports

Installation and maintenance manuals

Declaration of conformity (CE marking for relevant products)

🧩 Application-Specific Designs
Many GESTRA components are engineered to exceed minimum requirements in:

Steam and condensate management

High-pressure/high-temperature fluid systems

Aggressive or corrosive media (chemical resistance)

Potable water and hygienic applications (WRAS or DVGW when applicable)