Description

TECHNICAL DATA SHEET

Product Name: 1/2-inch 900LB DBB Floating Ball Valve
Model/Specification: 1/2″-900LB-DBB-FLOAT
Valve Type: Double Block & Bleed (DBB) Floating Ball Valve
Connection Type: RTJ Flanged / NPT-F / Socket Weld / Butt Weld User specified

1. Basic Design Parameters

2. Technical Specifications

3. DBB Functionality

4. Material of Construction (Recommended – Carbon Steel A105N)

*For Stainless Steel version (F304/F316): body/ends to A182 F304/F316, bolting to A193 B8 / A194 8 .*
*For Low Temperature version (LF2): body/ends to A350 LF2, bolting to A320 L7 / A194 4 .*

5. Main Dimensions & Connection Details

*Note: Dimensions for 1/2″ Class 900 DBB Floating Ball Valve. Based on industry standards for small bore DBB valves. Consult manufacturer for certified drawings .*

5.1 Overall Dimensions (Approximate)

Note: DBB design adds length compared to standard ball valves. Face-to-face dimensions per manufacturer’s standard .

5.2 Flange Details (RTJ – Per ASME B16.5 – Class 900)

5.3 End Preparation (Alternative Connections)

5.4 Bleed Valve Details

6. Pressure-Temperature Rating (ASME B16.34 / Class 900)

Material Group: Carbon Steel (ASTM A105N) with Soft Seats

*For Stainless Steel (F304/F316): similar ratings up to 400°C with derating .*

7. Test Pressure (API 598 / EEMUA 182)

8. Flow Characteristics (1/2″ – Full Bore)

9. Features & Applications

• Key Features:

  • Double Block & Bleed (DBB) Function: Provides simultaneous isolation from both upstream and downstream pressure with a central cavity that can be vented to verify seal integrity .

  • Dual Ball Design: Two independent floating balls within a single forged body .

  • Integrated Bleed Valve: Needle valve between balls allows cavity pressure release and confirms zero leakage before maintenance .

  • Compact Design: Replaces multiple valves (two block valves and a bleed valve) with a single, space-saving unit .

  • Enhanced Safety: Allows safe maintenance of downstream equipment without system shutdown; cavity venting confirms zero leakage before work begins .

  • Forged Body Construction: Close die forged steel provides superior strength, uniform grain flow, and absence of porosity – ideal for high-pressure Class 900 service .

  • NACE MR0175 Compliance: Available with materials certified for sour (H₂S) service .

  • Anti-Static Device: Ensures electrical continuity across the valve to prevent spark ignition in flammable services .

  • Blow-out Proof Stem: Stem is retained within the valve body even if the gland is removed under pressure .

  • Fire-Safe Design: Optional API 607 / API 6FA certification ensures sealing integrity in case of fire .

  • Cavity Pressure Relief: Self-relieving seats prevent over-pressure in the ball cavity due to thermal expansion .

  • Low Pressure Loss: Minimizes pressure drop through the valve for better flow efficiency .

  • Low Actuation Torque: Reduces effort required for valve operation .

  • Lockable Handle: Provides safety lockout capability for maintenance .

• Main Applications:

  • Oil & Gas Production: Wellhead isolation, flow lines, gathering systems .

  • Refineries & Petrochemical: Instrument root valves, sample points, bleed applications .

  • Chemical Processing: Isolation for hazardous or toxic fluids requiring double containment .

  • Natural Gas Processing: Gas treatment plants, pipeline isolation .

  • LNG Facilities: Low temperature applications with appropriate materials .

  • Pipeline Systems: Pressure gauge isolation, vent and drain applications .

  • Offshore Platforms: Compact isolation for space-constrained applications .

  • High-Pressure Testing: Test stands and hydraulic systems .

  • Sour Service (NACE): H₂S environments with appropriate material selection .

  • Power Generation: Steam and high-pressure fluid systems .

  • Instrumentation: Interface for pressure instruments and gauges .

10. DBB Valve Configuration Diagram

    [INLET] =====[ BALL VALVE 1 ]=====[ BLEED ]=====[ BALL VALVE 2 ]=====[ OUTLET]
    (Flanged)     (Upstream Block)       (Vent)       (Downstream Block)     (NPT/SW/BW)

• Normal Operation: Both ball valves open, bleed valve closed

• Isolation Mode: Both ball valves closed, bleed valve closed

• Bleed/Test Mode: Both ball valves closed, bleed valve open – cavity pressure released, confirms seal integrity

11. Ordering Information

Please specify when ordering:

1. Valve size: 1/2″ (DN15)

2. Pressure class: 900LB

3. Body material: A105N / LF2 / F304 / F316 / Duplex

4. End connections: RTJ / NPT-F / SW / BW / Mixed connections

5. Seat material: PTFE / RPTFE / PEEK / Metal

6. Bore type: Full Bore / Reduced Bore

7. Bleed valve type: Needle valve / Ball valve

8. Operation: Lever handle / Gearbox / Pneumatic actuator / Electric actuator

9. Special requirements: Fire-safe (API 607/6FA), NACE MR0175, oxygen cleaning, cryogenic service, ISO 15848 fugitive emission

10. Certifications: Material Test Reports (EN 10204 3.1/3.2), NACE certificates, PMI testing

*Disclaimer: The above data is prepared based on common industry standards (API 6D, EEMUA 182, ASME B16.34, API 598) for DBB floating ball valves . The DBB design provides critical double isolation and bleed functionality for high-pressure and hazardous service applications . Specific dimensions, materials, and pressure ratings may vary by manufacturer. The final technical agreement and certified drawings shall prevail.*