1″-1500LB DBB Double Ball Ball Valve

TECHNICAL DATA SHEET

Product: DBB Double Block & Bleed Ball Valve
サイズ： 1 inch (DN25)
圧力クラス: Class 1500
Design: Double Ball in Series, Integral Body
End Connections: One End NPT (Female) / Opposite End Flanged

1. Basic Specifications

2. Features & Functionality

• DBB Functionality (Double Block & Bleed): Two independent ball valves in series with a bleed port between them. When both valves are closed, the intermediate cavity can be vented or monitored, providing positive double isolation from both upstream and downstream sides.
• Integral Body Construction: Both ball valves share a single compact body, minimizing potential leak paths and reducing installation space.
• Blowout-Proof Stem: Each ball valve is equipped with a blowout-proof stem for safe operation under high pressure.
• Versatile Seating Options: Available with soft seats (PTFE / PEEK) or metal seats (tungsten carbide / Stellite) to suit high-temperature, high-pressure, or abrasive media applications.
• Operating Modes: Can be fitted with hand levers, gear operators, pneumatic actuators, or electric actuators; the two ball valves can be operated independently or simultaneously.

3. Material List (Recommended High-Pressure / High-Temperature Configuration)

Note: NACE MR0175 compliant materials are available for sour service applications.

4. Dimensions & Structural Data

Note: Final dimensions to be confirmed by manufacturing drawings.

5. Design & Testing Standards

6. DBB Functionality Description

The Double Block & Bleed configuration is essential for applications requiring absolute isolation:

• Instrument Isolation: Provides safe isolation and venting for pressure transmitters, flow meters, and other instruments, enabling maintenance without process interruption.
• Sampling Systems: Allows safe fluid sampling by double isolation and intermediate venting, preventing hazardous media exposure.
• High-Pressure Gas Systems: Ideal for natural gas, hydrogen, and other high-pressure gases where positive shut-off is critical.
• Online Maintenance: Enables isolation of a pipeline section without draining the entire system.

7. Operating Torque & Actuator Sizing

• Simultaneous Operation: If both ball valves are to be operated together (e.g., with a single actuator or geared linkage), total torque is approximately the sum of individual ball torques.
• Independent Operation: If each ball is operated separately, size actuators per individual ball torque.
• High-Temperature & Metal Seated: Metal seated configurations generate higher torque due to thermal expansion; actuator output torque should be at least 1.3 ~ 1.5 times the maximum measured valve torque.

8. Typical Applications

• Oil & gas pipelines and station piping
• Refinery instrument impulse line isolation
• Chemical plant sampling systems
• High-pressure hydraulic test benches
• Hydrogen refueling station high-pressure circuits

This data sheet reflects the specified configuration: 1″ Class 1500 DBB valve with one NPT end and one flanged end. For customized materials (e.g., duplex, Inconel), NACE compliance, or automated actuation, please contact us for further details.

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