Technical Data Sheet: 1/2″-300LB BW Ends Cryogenic Bellows Seal Gate Valve (F316L)
Item | Đặc điểm kỹ thuật |
Product Name | Cryogenic Bellows Seal Gate Valve / Low Temperature Bellows Gate Valve |
Loại van | Gate Valve (Bolted Bonnet, Rising Stem, Bellows Seal) |
Kích thước danh nghĩa | 1/2 Inch (DN15) |
Xếp hạng áp suất | Class 300 LB (PN50) |
End Connection | Butt-Weld Ends (BW) per ASME B16.25 |
Vật liệu thân máy | ASTM A182 F316L (Austenitic Stainless Steel) |
Design Standard | API 602 / ASME B16.34 / BS 5352 |
General Description
The 1/2″-300LB Cryogenic Bellows Seal Gate Valve is specifically designed for service in low-temperature applications requiring zero leakage, such as handling liquefied gases (LNG, LN₂, LOX, LAr). Constructed entirely from ASTM A182 F316L stainless steel, this valve ensures excellent toughness and ductility at cryogenic temperatures down to -196°C . It features an extended bonnet (long neck) design combined with a metal bellows seal to protect the packing and stem seals from extreme cold while providing absolute containment of the medium. The butt-weld ends provide a permanent, leak-free connection suitable for critical cryogenic service .
Technical Parameters
Tham số | Value / Range | Nhận xét |
Xếp hạng áp suất | Class 300 LB (PN50 / 5.0 MPa) | Working pressure per ASME B16.34 |
Kích thước danh nghĩa | 1/2 Inch (DN15) | |
Design Temperature | -196°C to +80°C | Suitable for cryogenic media down to -196°C (LNG, LN₂) |
Applicable Media | LNG, LN₂, LO₂, LAr, LC₂H₄ | Liquefied natural gas, nitrogen, oxygen, argon, ethylene |
Connection Type | Butt-Weld Ends (BW) | Per ASME B16.25 / ASME B36.19M |
Cơ chế niêm phong | Bellows Seal + Packing | Double sealing system for zero leakage |
Hoạt động | Handwheel | Manual rising stem |
Special Feature | Extended Bonnet + Bellows Seal | Protects packing from freezing; ensures zero fugitive emissions |
Materials of Construction
All pressure-containing parts are manufactured from ASTM A182 F316L austenitic stainless steel, specifically selected for its superior low-temperature toughness and corrosion resistance.
Thành phần | Material (ASTM) | Nhận xét |
Thân hình | ASTM A182 F316L | Austenitic Stainless Steel (0.03% max Carbon) |
Bonnet / Valve Cover | ASTM A182 F316L | Extended bonnet design for cryogenic service |
Gate / Wedge | ASTM A182 F316L | Solid wedge, fully guided |
Thân cây | ASTM A182 F316L | Rising stem, roll-threaded for strength |
Bellows Assembly | ASTM A182 F316L | Metal bellows for zero leakage sealing |
Seat Ring | Integral with Body / Deposit welded | Stellite hardfacing optional for extended life |
Body-Bonnet Gasket | Spiral Wound, 304SS + Flexible Graphite | Ensures leak-tight seal at low temperatures |
Bolting (Studs) | ASTM A193 Grade B8 (Class 2) | Stainless steel, strain-hardened |
Bolting (Nuts) | ASTM A194 Grade 8 | Stainless steel |
Packing | Flexible Graphite | Secondary seal, low fugitive emissions |
Packing Gland | ASTM A182 F316L | |
Yoke / Support | ASTM A182 F316L | |
Stem Nut | Copper Alloy / Bronze | |
Handwheel | Carbon Steel / Malleable Iron | ASTM A197 / A47 |
Dimensional Data
*Note: Dimensions are typical for 1/2″ Class 300 BW bellows seal gate valve with F316L body. For exact installation dimensions, refer to manufacturer’s certified drawing.*
Dimension | Value (mm) | Value (inches) | Remarks / Standard |
Face-to-Face Length (L) | 140 mm | 5.51″ | For BW ends, Class 300, 1/2″ (per API 602 / manufacturer data) |
Overall Height (H) – Closed | ~ 200-210 mm | ~ 8.0″ | From centerline of valve to top of handwheel (approx.) |
Extended Bonnet Height (B) | 150-180 mm (typical) | 6.0-7.0″ | From body centerline to bottom of packing flange |
Handwheel Diameter (W) | 120-140 mm | 4.7-5.5″ | |
Weld End OD (A) | 21.3 mm | 0.84″ | Per ASME B16.25 (Schedule 40S typical) |
Weld End Wall Thickness (t) | 3.73 mm | 0.147″ | Per ASME B36.19M (Schedule 40S) |
Approx. Weight | ~ 9-10 kg | ~ 20-22 lbs | Slightly heavier than standard due to bellows assembly |
Applicable Standards
- Design & Manufacture: API 602, ASME B16.34, BS 5352
- Bellows Design: ISO 15848 (Fugitive Emission Standards)
- Face-to-Face Dimensions: ASME B16.10 (for BW ends, refer to manufacturer)
- Butt-Weld Ends: ASME B16.25 / ASME B36.19M
- Pressure-Temperature Rating: ASME B16.34 (F316L Group 2)
- Inspection & Testing: API 598, ISO 5208
- Cryogenic Testing: ISO 28921 (Low temperature valve testing)
- Material Certification: EN 10204 Type 3.1 (Mill Certificates with traceability)
- Low-Temperature Impact Testing: Per ASME B16.34 / ASTM A370 (Charpy V-Notch at -196°C)
Key Features & Applications
Key Features:
- F316L Austenitic Stainless Steel: Provides exceptional toughness, ductility, and corrosion resistance at cryogenic temperatures as low as -196°C .
- Bellows Seal Design: Metal bellows assembly provides zero-leakage stem sealing, eliminating fugitive emissions and preventing介质 loss .
- Extended Bonnet with Bellows + Packing Double Seal: The long neck raises the stuffing box away from the cold line, ensuring the packing remains above freezing. The bellows provides primary seal, with packing as secondary backup .
- Zero Leakage Performance: Bellows seal eliminates the need for gland packing adjustments and ensures compliance with ISO 15848 fugitive emission standards .
- Low-Temperature Toughness: All F316L components are impact-tested at -196°C to guarantee resistance to brittle fracture .
- Leak-Free Construction: Butt-weld ends eliminate flange leakage paths, critical for cryogenic service.
- Long Service Life: Bellows design eliminates stem seal wear, significantly extending valve life in cyclic service .
- Full Traceability: Material test reports (MTRs) available per EN 10204 3.1.
Main Applications:
- LNG (Liquefied Natural Gas) Plants and Terminals
- Air Separation Units (LOX, LIN, LAr)
- Ethylene and Petrochemical Cryogenic Processes
- Storage and Transportation of Cryogenic Liquids
- Hydrogen Liquefaction (LH₂) Facilities (subject to material compatibility review)
- Critical Service Applications Requiring Zero Fugitive Emissions
Ordering Information
When ordering, please specify:
- Product: 1/2″ Cryogenic Bellows Seal Gate Valve
- Xếp hạng áp suất: Class 300 LB
- Kết thúc kết nối: Hàn đối đầu (BW) theo ASME B16.25
- Vật liệu thân máy: ASTM A182 F316L (for -196°C service)
- Bellows Material: ASTM A182 F316L
- Test Requirements: API 598, with Impact Test at -196°C per ASME B16.34
- Fugitive Emission Test: ISO 15848 (optional)
- Media: LNG / LN₂ / LO₂ / etc.
- Chứng nhận: EN 10204 Type 3.1 Material Certificates required
Notes:
- This datasheet is based on API 602, ASME B16.34, and common industry practice for cryogenic bellows seal valves .
- F316L material provides optimum performance for services below -101°C due to its low carbon content and fully austenitic structure.
- For oxygen service (LOX), special cleaning and degreasing procedures are required (refer to ASTM G93).
- Bellows seal valves are recommended for critical applications requiring zero fugitive emissions and maximum reliability .
- Always consult the manufacturer’s certified dimensional drawing for installation and ensure weld end schedule matches mating pipe.
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