1/2″-300LB BW Ends Cryogenic Bellows Seal Gate Valve

1/2″-300LB BW Ends Cryogenic Bellows Seal Gate Valve

Valve Type Gate Valve (Bolted Bonnet, Rising Stem, Bellows Seal)
Nominal Size 1/2 Inch (DN15)
Pressure Rating Class 300 LB (PN50)
End Connection Butt-Weld Ends (BW) per ASME B16.25
Body Material ASTM A182 F316L (Austenitic Stainless Steel)
Design Standard API 602 / ASME B16.34 / BS 5352

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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:

  1. Product: 1/2″ Cryogenic Bellows Seal Gate Valve
  2. Xếp hạng áp suất: Class 300 LB
  3. Kết thúc kết nối: Hàn đối đầu (BW) theo ASME B16.25
  4. Vật liệu thân máy: ASTM A182 F316L (for -196°C service)
  5. Bellows Material: ASTM A182 F316L
  6. Test Requirements: API 598, with Impact Test at -196°C per ASME B16.34
  7. Fugitive Emission Test: ISO 15848 (optional)
  8. Media: LNG / LN₂ / LO₂ / etc.
  9. 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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