1/2″-2500LB Cryogenic Globe Valve
Description
TECHNICAL DATA SHEET
Product: Cryogenic Globe Valve
Size: 1/2 inch (DN15)
Pressure Class: Class 2500
Body Material: F316L (Stainless Steel) / LF2 (Low‑Temp Carbon Steel) as specified
Design: Bolted Bonnet, Extended Bonnet for Cryogenic Service
1. Basic Specifications
| Parameter | Value |
|---|---|
| Nominal Size | 1/2″ (DN15) |
| Pressure Rating | Class 2500 (PN 420) |
| Valve Type | Globe Valve – Manual or Actuated |
| Body Construction | Bolted Bonnet with Extended Bonnet (Cryogenic Service) |
| End Connections | Socket Weld (SW) / Butt Weld (BW) / Flanged (ASME B16.5 Class 2500) as specified |
| Temperature Range | –196°C ~ +80°C (for cryogenic service) |
| Suitable Media | LNG (Liquefied Natural Gas), LPG, liquid nitrogen, liquid oxygen, liquid argon, ethylene, and other cryogenic fluids |
| Flow Direction | Usually below seat (pressure under the disc) for tight shut‑off |
2. Main Features
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Cryogenic Service Design: Extended bonnet design isolates the stem packing from the cryogenic fluid, preventing ice formation and ensuring proper packing function at low temperatures.
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High‑Pressure Capability: Class 2500 rating suitable for high‑pressure cryogenic systems.
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Low‑Temperature Material Selection: Body and trim materials are selected for excellent toughness and impact resistance at cryogenic temperatures (e.g., F316L stainless steel for down to –196°C, LF2 for down to –46°C).
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Reliable Shut‑Off: Precision‑machined seat and disc provide tight sealing; optional metal‑to‑metal or soft seat (PEEK / PTFE) configurations available.
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Anti‑Freeze Protection: Extended bonnet provides sufficient distance between the cryogenic fluid and the packing gland, preventing freezing and ensuring smooth stem operation.
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Blowout‑Proof Stem: Stem is designed to prevent ejection under pressure.
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Purge Port (Optional): Provisions for back‑venting or purge connections available for safety in oxygen or hazardous services.
3. Material List (Recommended Cryogenic Configuration)
| Item | Part | Material |
|---|---|---|
| 1 | Body | F316L (ASTM A182 F316L) – for –196°C service |
| 2 | Bonnet | F316L (Extended Bonnet) |
| 3 | Disc | F316L + Stellite 21 Hardfacing (optional PTFE / PEEK insert) |
| 4 | Seat Ring | F316L + Stellite 21 Hardfacing (or integral soft seat) |
| 5 | Stem | F316 / 17-4PH |
| 6 | Packing | Flexible Graphite or PTFE (low‑temperature grade) |
| 7 | Gasket | Spiral Wound, F316L + Graphite / PTFE |
| 8 | Bolting | A193 B8M / A194 B8M (316 stainless steel) |
| 9 | Extended Bonnet | Provides thermal isolation between cold media and packing |
| 10 | Handwheel / Operator | Standard handwheel or gear operator |
Note: For –46°C to –101°C service, LF2 (A350 LF2) may be used; for –196°C service, F316L or CF8M is required.
4. Dimensions & Structural Data
| Parameter | Value |
|---|---|
| Face‑to‑Face Length (L) | ~90 – 110 mm (varies by end connection and standard) |
| Extended Bonnet Height | ~150 – 200 mm (to ensure proper thermal gradient) |
| End Connections | Socket Weld (ASME B16.11) or Butt Weld (ASME B16.25) or Flanged (ASME B16.5 Class 2500) |
| Approx. Weight | ~4 – 8 kg (depending on end connection) |
| Stem Diameter | ~12 – 16 mm |
Note: Final dimensions to be confirmed by manufacturing drawings.
5. Design & Testing Standards
| Item | Standard |
|---|---|
| Design & Manufacture | ASME B16.34, API 602 (for small bore forged valves) |
| End Connections | ASME B16.11 (SW), ASME B16.25 (BW), ASME B16.5 (Flanged) |
| Pressure‑Temperature Rating | ASME B16.34 (cryogenic derating applies) |
| Cryogenic Testing | BS 6364 (or customer specification) |
| Pressure Testing | API 598 or ISO 5208 |
| Low‑Pressure Air Test | 0.6 MPa (6 bar) – no visible leakage |
| High‑Pressure Hydrostatic Test | 1.5 × rated pressure (body), 1.1 × rated pressure (seat) |
| NACE Compliance | NACE MR0175 / ISO 15156 (optional for sour cryogenic service) |
6. Cryogenic Service Considerations
| Consideration | Requirement |
|---|---|
| Material Toughness | Materials must pass Charpy impact tests at service temperature (e.g., –196°C for F316L) |
| Extended Bonnet | Minimum height ensures packing temperature remains above freezing point of moisture in the air |
| Leakage Rate | Cryogenic valves typically require tighter shut‑off (helium leak testing often specified) |
| Thermal Cycling | Valve design must accommodate thermal contraction and expansion without loss of sealing |
| Packing | Low‑temperature packing (e.g., PTFE or flexible graphite) must be used to maintain seal flexibility |
7. Operating Guidelines
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Orientation: Typically installed with stem vertical; flow direction is usually below the seat (pressure under disc) for tight shut‑off.
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Thermal Conditioning: Before introducing cryogenic fluid, the valve should be slowly conditioned to avoid thermal shock.
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Operation: Handwheel operation may become stiff at cryogenic temperatures due to ice formation on the extended bonnet; this is normal and does not indicate packing failure.
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Maintenance: Extended bonnet valves allow packing replacement without removing the valve from the line, as the packing is located above the thermal isolation zone.
8. Typical Applications
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LNG Infrastructure: Liquefied natural gas receiving terminals, loading arms, and storage tanks.
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Air Separation Units (ASU): Liquid oxygen, liquid nitrogen, and liquid argon handling.
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Petrochemical: Ethylene and propylene plants with cryogenic processes.
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Hydrogen: Liquid hydrogen storage and transfer systems (requires special material compatibility).
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Cold Boxes: Cryogenic process modules in gas processing facilities.
9. Ordering Information
When ordering, please specify:
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Size: 1/2″ – Class 2500
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Body Material: F316L (for –196°C) or LF2 (for –46°C)
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End Connections: Socket Weld / Butt Weld / Flanged
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Seat Type: Metal Seated or Soft Seated (PEEK / PTFE)
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Optional Features: NACE MR0175, purge port, helium leak test, cryogenic test certification
This data sheet reflects the 1/2″ – 2500LB Cryogenic Globe Valve configuration. For specific material grades, end connection details, or additional testing requirements, please contact us with your project specifications.
