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.
1. Main Design Codes and Standards
| Item | Standard / Code |
|---|---|
| Valve Design | API 6D / ISO 14313 (DBB design), ASME B16.34 |
| Face-to-Face | ASME B16.10 Long Pattern (for flanged ball valves) |
| Flanged Ends | ASME B16.5 Class 1500, Raised Face (RF) |
| NPT Bleed/Vent | ASME B1.20.1 (NPT threaded connection for cavity) |
| Pressure-Temperature Ratings | ASME B16.34, Material Group 2.2 (A182 F316) |
| Testing & Inspection | API 598, API 6D |
| Fire-Safe Design (Optional) | API 607 / API 6FA |
| Anti-Static Design | Per API 6D (≤10 Ω) |
| Blow-out Proof Stem | Integral stem shoulder retained by body |
2. Main Technical Parameters
| Parameter | Specification |
|---|---|
| Nominal Size | 1/2″ (DN15) |
| Pressure Class | Class 1500 (PN260) |
| Main End Connections | Raised Face (RF) flanges, ASME B16.5 Class 1500 |
| Bleed/Vent Connection | 1/4″ or 1/2″ NPT threaded (female), plugged and sealed |
| Body Construction | Three-piece bolted, side-entry or one-piece top-entry (trunnion) |
| Ball Type | Trunnion-mounted (full bore or reduced bore per specification) |
| Seat Configuration | Dual independent seats, spring-loaded, pressure-energized (double piston effect or single piston effect) |
| Sealing Class | Soft Seated: Zero Leakage (API 598 Rate A); Metal Seated: FCI 70-2 Class V/VI |
| Operation | Lever handle (standard); gear or actuator mounting available |
| Flow Direction | Bi-directional, with double block and bleed capability |
| Cavity Bleed | Dedicated NPT port for venting or draining the body cavity |
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.
| Temperature (°C) | Max. Working Pressure (bar) | Approx. psi |
|---|---|---|
| -29 to 38 | 259.0 | 3755 |
| 50 | 255.0 | 3700 |
| 100 | 215.0 | 3120 |
| 150 | 194.0 | 2815 |
| 200 | 173.0 | 2510 |
| 250 | 155.0 | 2250 |
| 300 | 138.0 | 2000 |
| 350 | 124.0 | 1800 |
| 400 | 110.0 | 1595 |
| 450 | 96.5 | 1400 |
| 500 | 82.7 | 1200 |
| 538 | 69.0 | 1000 |
Consult manufacturer for seat-specific P-T curves, especially for PEEK or metal-seated options.
4. Materials of Main Parts
| No. | Part Name | Material | Remarks |
|---|---|---|---|
| 1 | Body / Bonnet | ASTM A182 F316 (Forged) | Austenitic stainless steel, solution annealed |
| 2 | Ball | ASTM A182 F316 | Solid F316, hard chrome or ENP coated optional |
| 3 | Stem | ASTM A182 F316 | Anti-blowout, polished |
| 4 | Seat Rings (dual) | PEEK (standard) or Devlon/PTFE | Spring-loaded, bi-directional, pressure-energized |
| 5 | Trunnion Bearings | PEEK / PTFE composite | Self-lubricating |
| 6 | Body Seals / Gaskets | SS316/Graphite spiral wound | Fire-safe option with graphite |
| 7 | Stem Packing | Graphite / PTFE | Live-loaded optional |
| 8 | Bleed/Vent Valve (optional) | F316 ball/needle valve + NPT connection | Integral block valve for safe venting |
| 9 | Bolting | ASTM A193 B8M / A194 Gr.8M | Stainless steel for corrosion resistance |
| 10 | Lever Handle | Stainless Steel 304 or 316 | Lockable in open/closed position |
5. Dimensions & Weight – 1/2″ Class 1500 RF (Typical)
| Parameter | Dimension (mm) | Remarks |
|---|---|---|
| Face-to-Face (L) | 216 | ASME B16.10 Long Pattern for 1/2″ Class 1500 |
| Flange Outside Diameter (D) | 136 | ASME B16.5 Class 1500, RF |
| Raised Face Height | 7 | |
| Centerline to Top (H, open) | Approx. 155 | With lever handle |
| Handle Length (W) | Approx. 120 | |
| NPT Bleed Size (typical) | 1/4″ or 1/2″ | Plugged, threaded connection on body |
| Approx. Weight | 8.5 kg |
Certified outline drawings with exact NPT location and flange drilling provided with order.
6. Performance Testing
| Test Item | Test Medium | Test Pressure | Acceptance Criteria |
|---|---|---|---|
| Shell Hydrostatic | Water | 388.5 bar (1.5 × 259 bar) | No visible leakage or deformation |
| Seat Tightness – High Pressure (both directions) | Water | 284.9 bar (1.1 × 259 bar) | API 598 Rate A (zero leakage for soft seats) |
| Seat Tightness – Low Pressure | Air / Nitrogen | 6 bar (87 psi) | Bubble-tight |
| Double Block & Bleed Verification | Water/Gas | Pressurize one side, verify no leakage past second seat; bleed cavity | No detectable leak across seats; cavity bleeds to zero pressure |
| Anti-Static Test | Dry circuit | ≤ 10 Ω | API 6D |
| Fire-Safe (if ordered) | – | Per API 607 | Pass |
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.
8. Application Scope
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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.
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Temperature Range: -29 °C to +150 °C (PEEK seats); up to +350 °C with metal/graphite seats.
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Industries: Oil & gas production, pipeline isolation, chemical processing, power generation, hydraulic and instrumentation panels.
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Key Advantages:
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DBB design enhances safety by eliminating the need for two separate valves and spool.
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The NPT bleed allows for easy verification and purging.
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F316 material ensures longevity in harsh environments.
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Trunnion design reduces torque, enabling easier manual or automated operation.
-
9. Optional Configurations & Accessories
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Seat Material: Devlon, reinforced PTFE, metal-to-metal with Stellite hardfacing.
-
Ball & Seat Coating: Tungsten Carbide (HVOF), Chrome Carbide.
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Cavity Bleed Valve: Integral 1/2″ NPT F316 ball or needle valve permanently mounted.
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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.
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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.
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
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.
