Description

TECHNICAL DATA SHEET

Product Name: 1/2-inch 1500LB DBB Floating Ball Valve
Model/Specification: 1/2″-1500LB-DBB-FLOAT-RTJxNPT
Valve Type: Double Block & Bleed (DBB) Floating Ball Valve
Connection Type: RTJ Flanged (Inlet) x Female NPT (Outlet)

1. Basic Design Parameters

2. Technical Specifications

3. DBB Functionality

4. Material of Construction (Recommended – Stainless Steel)

*For Carbon Steel version (A105/LF2): body/ends to A105/A350 LF2, ball/stem to 13Cr/304.*

5. Main Dimensions & Connection Details

*Note: Dimensions for 1/2″ Class 1500 DBB Floating Ball Valve with RTJ Flanged x NPT-F Ends. Based on industry standards for small bore DBB valves .*

5.1 Overall Dimensions (Approximate)

Note: DBB design adds length compared to standard ball valves. Consult manufacturer for certified drawings.

5.2 RTJ Flanged End Details (Per ASME B16.5 – Class 1500)

5.3 Female NPT End Details (Per ASME B1.20.1)

6. Pressure-Temperature Rating (ASME B16.34 / Class 1500)

*Material Group: Stainless Steel (A182 F304/F316) with Soft Seats*

*For Carbon Steel (A105/LF2): similar ratings up to 425°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 .

  • 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 .

  • Mixed End Connections (RTJ x NPT-F): RTJ flanged connection provides metal-to-metal seal for high-pressure integrity; NPT female allows direct instrument or piping connection .

  • Floating Ball Design: Ball floats against downstream seat under pressure, providing tight, leak-proof sealing .

  • Forged Body Construction: Close die forged steel provides superior strength, uniform grain flow, and absence of porosity – ideal for high-pressure Class 1500 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 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 .

  • 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 .

  • 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 .

  • Hydrocarbon Processing: Where double isolation is required by safety codes .

10. DBB Valve Configuration Diagram

    [RTJ FLANGED] =====[ BALL VALVE 1 ]=====[ BLEED ]=====[ BALL VALVE 2 ]=====[ NPT-F ]
         (Inlet)         (Upstream Block)      (Vent)       (Downstream Block)      (Outlet)

• Position 1 (Closed): Both ball valves closed, bleed valve closed

• Position 2 (Bleed/Test): 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: 1500LB

3. Body material: A105 / LF2 / F304 / F316

4. End connections: RTJ Flanged x NPT-F

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

9. Special requirements: Fire-safe (API 607), NACE MR0175, oxygen cleaning, cryogenic service, etc.

10. Certifications: Material Test Reports (3.1/3.2), NACE certificates

*Disclaimer: The above data is prepared based on common industry standards (API 6D, ASME B16.34, EEMUA 182, API 598) for DBB floating ball valves with mixed RTJ x NPT ends . 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.*