Standard Swing Check Valve
Description
TECHNICAL DATA SHEET
API 6D SWING CHECK VALVE
Full Port · Replaceable Seat · Stellite 6 Sealing
1. Design & Standards
| Parameter | Specification |
|---|---|
| Valve Type | Swing Check Valve (Full Bore) |
| Design Standard | API 6D (24th Edition) |
| Pressure Standard | ASME B16.34 |
| Face-to-Face | ASME B16.10 / API 6D Table 8 |
| End Connection | RF Flanges (ASME B16.5) or BW Ends (ASME B16.25) |
| Fire Safe Design | API 607 / API 6FA (Optional) |
2. Materials
| Component | Material | Specification |
|---|---|---|
| Body & Bonnet | Carbon Steel | ASTM A216 WCB |
| Disc (Clapper) | Carbon Steel | ASTM A216 WCB |
| Seat Ring | Replaceable Stainless Steel + Stellite 6 | ASTM A182 F304 + AWS A5.21 ERCoCr-A |
| Hinge Pin | Stainless Steel | ASTM A479 Type 316 |
| Bushings | Self-Lubricating Bronze | ASTM B505 C95400 |
| Bolting | Alloy Steel | ASTM A193 B7 / A194 2H |
| Gasket | Spiral Wound (SS316 + Flexible Graphite) | ASME B16.20 |
Hardfacing Detail:
Seat sealing surface: Stellite 6 overlay (min. 2.5 mm thickness, HRC 40-45).
Hardness differential ≥ HRC 5 between seat and disc sealing surfaces.
3. Pressure & Temperature Ratings
| Class | Max. Working Pressure (bar) | Temperature Range | Test Pressure (bar) |
|---|---|---|---|
| Class 300 | 50.4 @ 38°C | -29°C to +425°C | Shell: 75.6 / Seat: 55.4 |
| Class 600 | 100.8 @ 38°C | -29°C to +425°C | Shell: 151.2 / Seat: 110.8 |
| Class 900 | 151.1 @ 38°C | -29°C to +425°C | Shell: 226.7 / Seat: 166.3 |
Note: Temperature derating per ASME B16.34.
4. Sealing & Performance
| Feature | Specification |
|---|---|
| Seal Type | Metal-to-Metal (Stellite 6 vs. Stellite 6/Disc) |
| Leakage Class | API 598 / API 6D: Class IV (Metal Seated) |
| Cracking Pressure | ≤ 0.14 bar (Size-dependent) |
| Flow Direction | Horizontal or Vertical (Upward flow only) |
| Backflow Prevention | Zero visible leakage per API 6D §7.3.2 |
5. Dimensional Data
| Size Range | NPS 2″ to 36″ (DN 50–900) |
|---|---|
| Port Size | Full Port (100% pipe ID) |
| Flange Drilling | ASME B16.5 Class 300/600/900 RF |
| Valve Weight | Per ASME B16.34 / API 6D Annex A |
6. Testing & Certification
| Test | Standard | Requirement |
|---|---|---|
| Shell Test | API 598 / API 6D | 1.5× rated pressure |
| Seat Test | API 598 / API 6D | 1.1× rated pressure |
| Backseat Test | API 6D | 1.1× rated pressure (if applicable) |
| Fugitive Emission | ISO 15848-1 / TA-Luft | Option: Class B (≤50 ppm) |
| NACE Compliance | MR0175 / MR0103 | Optional (H₂S service) |
| Fire Test | API 6FA | Optional (30 min fire endurance) |
7. Optional Features
-
Extended Bonnet: For cryogenic (-196°C) or high-temp (>425°C) service.
-
Anti-Slam Device: Spring-assisted closing for vertical installations.
-
Bolt-On Cover: For easy seat replacement without valve removal.
-
Locking Device: Mechanical disc lock in open position.
-
Injection Port: For sealant/grease injection (API 6D Annex F).
-
Position Indicator: Disc open/close visual indicator.
8. Marking & Documentation
-
Body Marking: Per API 6D §10.1 (PN, DN, Material, Manufacturer, Heat No.).
-
Certification: API 6D Monogram, Material Test Reports (MTRs), NDE Reports (RT/UT/PT).
-
Compliance: PED 2014/68/EU (Option: CE Category IV), CRN (Canadian Registration).
APPLICATION NOTES:
Typical Services: Crude oil, natural gas, refined products, CO₂ injection, produced water.
Excluded Services: Slurries, strong acids/alkalis, particulate-laden fluids.
Installation: Flow arrow must match pipeline direction. Vertical pipes require upward flow.
