F316 DBB Ball Valve – 1/2″ Class 1500 RF × NPT

Description

F316 DBB Ball Valve – 1/2″ Class 1500 RF × NPT (Double Block & Bleed)

Model: DBB-F316-0.5-1500-RF-NPT
Product Description: Double block and bleed (DBB) ball valve in ASTM A182 F316 stainless steel. Trunnion-mounted ball design with spring-loaded, pressure-energized seats ensures two independent sealing barriers. Flanged raised face ends (ASME B16.5 Class 1500) with integral NPT threaded cavity bleed/vent connection. Ideal for high-integrity isolation, calibration, and drainage in oil and gas, chemical, and power industries.

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1. Main Design Codes and Standards

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2. Main Technical Parameters

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3. Pressure-Temperature Ratings (ASME B16.34 Group 2.2 – A182 F316, Class 1500)

Body rating. Seats may impose lower temperature limits; PEEK seats are standard for high-pressure DBB, rated -29 °C to +150 °C continuous.

Consult manufacturer for seat-specific P-T curves, especially for PEEK or metal-seated options.

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4. Materials of Main Parts

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5. Dimensions & Weight – 1/2″ Class 1500 RF (Typical)

Certified outline drawings with exact NPT location and flange drilling provided with order.

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6. Performance Testing

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7. Design Features

 

• True Double Block & Bleed: Two independent seating surfaces create positive isolation of pressure from both ends. The body cavity can be bled via the NPT port, verifying seal integrity and allowing safe maintenance.

• Trunnion-Mounted Ball: The ball is supported by trunnions, absorbing pressure thrust and reducing seat wear, ensuring consistent sealing at high pressure.

• Pressure-Energized Seats: The seats are spring-loaded for low-pressure sealing and pressure-energized for tight shut-off at full rating. Double piston effect (DPE) seats can be provided for bi-directional sealing even if one seat fails.

• Integral NPT Bleed/Vent: The cavity port allows pressure monitoring, sampling, purging, or complete drainage. A small needle valve or plug is typically fitted; a ball valve can be supplied for permanent connection.

• F316 Stainless Steel: Excellent corrosion resistance for sour gas, acids, and chloride-containing media, with full NACE MR0175 compliance (when specified).

• Anti-Blowout Stem & Anti-Static: Stem retention prevents ejection; conductive springs prevent static buildup.

• Compact, High-Integrity Design: Ideal for instrument isolation, chemical injection points, and high-pressure sampling systems.

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8. Application Scope

 

• Suitable Media: Sour gas, crude oil, hydraulic oil, water, acids, solvents, high-pressure steam (with graphite seats), and various chemical fluids compatible with 316 SS.

• Temperature Range: -29 °C to +150 °C (PEEK seats); up to +350 °C with metal/graphite seats.

• Industries: Oil & gas production, pipeline isolation, chemical processing, power generation, hydraulic and instrumentation panels.

• Key Advantages:

  • DBB design enhances safety by eliminating the need for two separate valves and spool.

  • The NPT bleed allows for easy verification and purging.

  • F316 material ensures longevity in harsh environments.

  • Trunnion design reduces torque, enabling easier manual or automated operation.

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9. Optional Configurations & Accessories

 

• Seat Material: Devlon, reinforced PTFE, metal-to-metal with Stellite hardfacing.

• Ball & Seat Coating: Tungsten Carbide (HVOF), Chrome Carbide.

• Cavity Bleed Valve: Integral 1/2″ NPT F316 ball or needle valve permanently mounted.

• End Connections: Flanged RTJ, Butt Weld, Socket Weld, or NPT threaded on both ends (instead of RF).

• Actuation: ISO 5211 top mounting pad for pneumatic, electric, or hydraulic actuators. Manual gear operator for higher torque.

• Fire-Safe Package: Graphite body seals and secondary metal seats per API 607/6FA.

• Sour Service: NACE MR0175 / ISO 15156 certified materials with hardness control.

• Live-Loaded Packing: For low-emission service per ISO 15848-1.

• Special Cleaning: Oxygen service cleaning per CGA G-4.1.

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10. Ordering Information

 

When ordering, specify:

• Model: DBB-F316-0.5-1500-RF-NPT

• Size: 1/2″

• Pressure Class: Class 1500

• Main Connection: RF Flanged

• Bleed/Vent: NPT size (e.g., 1/4″ or 1/2″)

• Seat Material: PEEK (standard) or alternative

• Operation: Manual lever / actuator (specify type and air supply)

• Service Medium & Temperature

• Fire-Safe / NACE / ISO 15848 requirements

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Disclaimer: This technical data sheet is for reference and selection purposes. Exact dimensions, ratings, and material certifications must be confirmed against the manufacturer’s certified documentation and approved drawings before procurement or installation.