F316 Globe Valve for Cryogenic-1/2″ 2500LB BW
Description
F316 Cryogenic Globe Valve – 1/2″ 2500LB BW Technical Data Sheet
Model: CGV-CR-F316-0.5-2500-BW
Product Description: Extended bonnet cryogenic globe valve, outside screw and yoke (OS&Y), bolted bonnet, rising stem with plug-type disc. Designed for temperatures down to -196 °C. All pressure-containing parts are forged ASTM A182 F316 stainless steel.
1. Main Design Codes and Standards
| Item | Standard / Code |
|---|---|
| Valve Design | ASME B16.34, BS 6364 |
| Face-to-Face Dimensions | ASME B16.10 (for Class 2500) |
| Butt Weld Ends | ASME B16.25, Schedule 160 / XXS bore |
| Pressure-Temperature Ratings | ASME B16.34, Material Group 2.2 |
| Cryogenic Service Requirements | BS 6364, ISO 28921-1 |
| Testing & Inspection | API 598, ISO 5208 (with cryogenic seat test) |
| Fugitive Emissions (optional) | ISO 15848-1 |
| Bonnet Design | Extended cold-insulating bonnet (gas column) |
2. Main Technical Parameters
| Parameter | Specification |
|---|---|
| Nominal Size | 1/2″ (DN15) |
| Pressure Class | Class 2500 (PN420) |
| End Connection | Butt Weld (BW) per ASME B16.25 |
| Body Construction | Bolted bonnet, OS&Y, rising stem |
| Disc Type | Plug disc, seat hardfaced |
| Sealing System | Extended bonnet with PTFE/graphite packing stack (live-loaded optional) |
| Flow Direction | “Low inlet” – under-seat flow (flow to close) |
| Design Temperature Range | -196 °C to +538 °C (body material capability; packing typically limited to 260 °C continuous) |
3. Pressure-Temperature Ratings (ASME B16.34, Group 2.2 – A182 F316)
Austenitic stainless steel retains full strength down to -196 °C; no derating required for cryogenic temperatures. The table gives maximum allowable non-shock working pressures.
| Temperature (°C) | Max. Working Pressure (bar) | Approx. psi |
|---|---|---|
| -196 to 38 | 425.0 | 6160 |
| 50 | 413.7 | 6000 |
| 100 | 345.0 | 5004 |
| 150 | 310.3 | 4500 |
| 200 | 275.8 | 4000 |
| 250 | 258.6 | 3750 |
| 300 | 241.3 | 3500 |
| 350 | 227.5 | 3300 |
| 400 | 213.7 | 3100 |
| 450 | 203.4 | 2950 |
| 500 | 193.1 | 2800 |
| 538 | 179.3 | 2600 |
Note: For continuously low cryogenic temperatures, packing material selection may impose a practical upper limit; consult the manufacturer for seat/packing compatibility across the full range.
4. Materials of Main Parts
| No. | Part Name | Material | Remarks |
|---|---|---|---|
| 1 | Body | ASTM A182 F316 | Forgings, fully solution annealed |
| 2 | Bonnet (Extended) | ASTM A182 F316 | Gas column extension, cold-insulating design |
| 3 | Disc (Plug) | ASTM A182 F316 | Seating face hardfaced with Stellite Gr.6 |
| 4 | Seat Ring | ASTM A182 F316 + Stellite overlay | Integral or screwed/welded-in, hardfaced |
| 5 | Stem | ASTM A182 F316 | Polished, with backseat shoulder |
| 6 | Packing | PTFE / Graphite composite (cryogenic formulation) | Adjustable, live-loading optional |
| 7 | Bonnet Gasket | SS316L/Graphite spiral wound | Cryogenic compatible |
| 8 | Gland / Gland Flange | ASTM A276 316 | |
| 9 | Yoke | ASTM A182 F316 / ASTM A240 316 | |
| 10 | Handwheel | Ductile Iron / SS304 | Rising-stem position indicator |
| 11 | Bolting | ASTM A193 B8M / A194 Gr.8M | SS316 fasteners, full corrosion resistance |
The extended bonnet length is thermally calculated to maintain the stuffing box area above 0 °C under rated cryogenic conditions, preventing ice formation and ensuring free stem movement.
5. Dimensions & Weight – Typical Example (1/2″ Class 2500 BW)
| Parameter | Dimension (mm) | Remarks |
|---|---|---|
| Face-to-Face (L) | 264 | Per ASME B16.10 for Class 2500 globe valve |
| Extended Bonnet Length (H1) | 150 (minimum) | Thermal length; ensures warm stuffing box |
| Centre to Top Handwheel (H, approx.) | 335 | Fully open position |
| Handwheel Diameter (D) | 150 | |
| Weld End Bore (ID) | To match Sch. 160 / XXS pipe | Typical wall thickness ≈ 7.0 mm |
| Weld End Outside Dia. | As per mating pipe standard | Wall thickness transition per ASME B16.25 |
| Approx. Weight | 11 kg |
Dimensions are typical for a standard manual valve. For exact certified dimensions and weld-end preparations, refer to the manufacturer’s final approved drawing.
6. Performance Testing
| Test Item | Test Medium | Test Pressure | Acceptance Criteria |
|---|---|---|---|
| Shell Hydrostatic (ambient) | Water | 637.5 bar (1.5 × rated WP at 38 °C) | No visible leakage or deformation |
| Seat Tightness (ambient, high pressure) | Water | 467.5 bar (1.1 × rated WP) | API 598 / ISO 5208 Rate A |
| Cryogenic Seat Test | Liquid Nitrogen (-196 °C) | 1.1 × rated WP at test temp | BS 6364 / ISO 28921-1 leakage rate |
| Backseat Test (ambient) | Water | 467.5 bar | No leakage at packing |
| Packing Leakage (optional low-E test) | Helium (sniff test) | < 50 ppmv | ISO 15848-1 class AH |
CWP (Cold Working Pressure) is the Class 2500 rating at 38 °C: 425 bar (6160 psi).
7. Cryogenic Design Features
-
Extended Bonnet: Protects the packing and actuator from freezing. The long gas column ensures the stem/packing interface remains above 0 °C, preventing ice lock.
-
Low-Inlet Flow Direction: The standard cryogenic globe valve configuration (flow under the disc) helps utilise the pressure drop to assist tight shut-off and minimises seat erosion.
-
Anti-Cavity Pressure Relief: In liquid cryogen service, a small bleed hole or pressure-relief seat design can be incorporated to prevent over-pressure due to trapped liquid vaporisation (consult factory).
-
F316 Material: ASTM A182 F316 offers excellent low-temperature impact toughness (typically > 50 J at -196 °C), matched with good corrosion resistance. The fully austenitic structure ensures no ductile-to-brittle transition.
-
Hardfaced Trim: Stellite Gr.6 seating surfaces provide galling resistance and durability at both cryogenic and elevated temperatures.
8. Application Scope
-
Suitable Media: Liquefied natural gas (LNG), liquid nitrogen (LIN), liquid oxygen (LOX – clean & degreased option available), liquid argon, liquid ethylene, and other clean cryogenic fluids.
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Temperature Range: -196 °C to +538 °C (body); extended bonnet design makes it best suited for continuous cryogenic operation below -50 °C.
-
Key Features:
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Robust bolted bonnet construction, easy to maintain.
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OS&Y design clearly shows valve position.
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True high-pressure Class 2500 rating for demanding cryogenic process lines.
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Butt weld ends ensure a leak-tight, crevice-free connection ideal for vacuum-insulated or cold box piping.
-
9. Optional Configurations & Accessories
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Bellows Seal: Additional multi-ply bellows (Inconel 625) welded to stem and bonnet can be provided for primary stem sealing, with PTFE packing as backup – for zero-external-leakage guarantee.
-
Live-Loaded Packing: Belleville spring stack maintains constant gland load during thermal cycling.
-
Oxygen Service Cleaning: Thoroughly degreased, cleaned, and bagged per CGA G-4.1 / ASTM G93.
-
Actuation: ISO 5211 mounting flange for pneumatic or electric actuator adaptation (extended coupling to maintain thermal isolation).
-
Locking Device: Key-locked handwheel or open/close stops.
-
Sensors: Proximity switches, solenoid valves.
Disclaimer: This technical data sheet is for reference and selection purposes, based on common industrial standards and typical cryogenic valve design practice. All exact dimensions, ratings, and material certifications must be confirmed against the manufacturer’s certified documentation, material test reports, and approved drawings before installation or procurement.
