1"-1500LB DBB Double Ball Ball Valve
1"-1500LB DBB Double Ball Ball Valve - Image 2
1"-1500LB DBB Double Ball Ball Valve - Image 3
1"-1500LB DBB Double Ball Ball Valve - Image 4

1″-1500LB DBB Double Ball Ball Valve

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Description

TECHNICAL DATA SHEET

Product: DBB Double Block & Bleed Ball Valve
Size: 1 inch (DN25)
Pressure Class: Class 1500
Design: Double Ball in Series, Integral Body
End Connections: One End NPT (Female) / Opposite End Flanged

1. Basic Specifications

Parameter Value
Nominal Size 1″ (DN25)
Pressure Rating Class 1500 (PN250)
Valve Design Double Block & Bleed (DBB) – two ball valves in series with integral bleed port
End Connections Upstream: NPT Female (per ASME B1.20.1)
Downstream: Flanged – ASME B16.5 Class 1500 (RF or RTJ)
Temperature Range –29°C ~ +500°C (depending on seat material)
Suitable Media High-pressure gas/liquid, steam, corrosive fluids
Fire Safe Design API 607 / ISO 10497

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)

Item Part Standard Material
1 Body A105N (ASTM A105 Normalized) / F316
2 Ball (2 pcs) A105N + Tungsten Carbide Coating / 316SS + Tungsten Carbide Coating
3 Seat Rings (2 sets) 316SS + Stellite 21 Hardfacing
4 Stems (2 pcs) 17-4PH / Inconel 718
5 Stem Packing Flexible Graphite + Braided Graphite
6 Body Gasket Spiral Wound, SS + Graphite
7 Bleed / Test Port 1/2″ NPT or Socket Weld
8 Bolting A193 B7 / A194 2H

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

4. Dimensions & Structural Data

Parameter Value
Face-to-Face Length (L) ~280 – 320 mm (varies by design; confirm with drawing)
Flange End ASME B16.5 Class 1500 – Raised Face (RF) or Ring Type Joint (RTJ)
NPT End 1″ NPT Female per ASME B1.20.1
Bleed Port Size 1/2″ NPT or 1/2″ Socket Weld
Top Height (H) ~220 mm (with hand lever)
Operating Torque (per ball) ~80 – 150 N·m
Approx. Weight ~22 – 30 kg (mixed end configuration)

Note: Final dimensions to be confirmed by manufacturing drawings.

5. Design & Testing Standards

Item Standard
Design & Manufacture API 6D (DBB Valves) / API 608 / ASME B16.34
NPT End ASME B1.20.1
Flanged End ASME B16.5
Pressure-Temperature Rating ASME B16.34
Fire Safe Test API 607 or API 6FA
Pressure Testing API 598 or ISO 5208
Low-Pressure Air Test 0.6 MPa (6 bar) – no visible leakage
High-Pressure Hydrostatic Test 1.5 × rated pressure (body), 1.1 × rated pressure (seat)
DBB Functional Test With both balls closed and bleed port open, no leakage from upstream or downstream

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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