DBB Dual-Ball Floating Ball Valves

TECHNICAL DATA SHEET

Product Name: DBB Dual-Ball Floating Ball Valve (Double Block & Bleed)

1. Product Description

The DBB (Double Block and Bleed) Dual-Ball Floating Ball Valve is a compact, multi-functional valve designed to provide positive isolation and safe venting in a single body. It integrates two independent floating ball valves (for blocking) and a bleed/vent valve (typically a ball or needle valve) into one unit . This design minimizes potential leak paths, reduces space and weight compared to conventional piping assemblies, and is ideal for applications requiring double isolation such as instrument root isolation, chemical injection, sampling points, and process drain applications .

2. Fitur Utama

• Compact DBB Design: Combines two block valves and one bleed valve in a single forged or cast body, eliminating multiple fittings and flanges .
• Floating Ball Design: Provides reliable bi-directional sealing. The downstream ball is forced against the seat by line pressure .
• Positive Isolation: Achieves double block capability, ensuring zero leakage on both the upstream and downstream sides simultaneously .
• Bleed Function: Central cavity features a bleed port (ball or needle valve) to relieve trapped pressure or verify seal integrity .
• Blowout-Proof Stem: Stem is designed with an internal shoulder to prevent ejection under pressure .
• Anti-Static Device: Springs and balls ensure electrical continuity between the ball, stem, and body to prevent static charge build-up .
• Fire-Safe Design (Optional): Available with fire-safe certification to API 607/6FA, featuring secondary metal-to-metal sealing .
• Low Fugitive Emissions: Optional live-loaded packing and compliance with ISO 15848 / TA-Luft .

3. Technical Specifications

4. Material of Construction

*Note: Special alloys such as Duplex (F51/F55), Super Duplex, Monel, Inconel, and Hastelloy are available upon request .*

5. Applicable Standards

• Design & Manufacture: API 6D, API 608, ASME B16.34, ISO 17292
• End-to-End / Face-to-Face: Manufacturer Standard / ASME B16.10
• Flange Dimensions: ASME B16.5
• Butt Weld Ends: ASME B16.25
• Socket Weld Ends: ASME B16.11
• Threaded Ends: ASME B1.20.1 (NPT) / ISO 228-1 (BSP)
• Fire-Safe Test: API 607 / API 6FA
• Fugitive Emission Test: ISO 15848-1 / TA-Luft VDI 2440
• Inspection & Testing: API 598 / API 6D / EN 12266-1

6. Dimensions (Reference: mm / inches)

*Dimensions are typical for Flanged Class 150/300/600 designs and may vary by manufacturer. Please consult specific drawings for exact figures.*

Class 150 / 300 / 600 (Typical Assembly)

Reference: Typical dimensions from industry sources .

7. Test Pressure (Hydrostatic)

*Note: Test pressures are based on ASME B16.34 / API 598 standards for ambient temperature water testing.*

Disclaimer: The information provided above is based on standard industry practices and manufacturer data . For exact specifications, dimensions, and custom configurations (such as special materials, pressure classes, or actuation), please refer to the official drawings or consult the factory. It is recommended to verify material compatibility for specific media and operating conditions.

JAMINAN:

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