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	사양
Product Name	Cryogenic Bellows Seal Gate Valve / Low Temperature Bellows Gate Valve
밸브 유형	Gate Valve (Bolted Bonnet, Rising Stem, Bellows Seal)
공칭 크기	1/2 Inch (DN15)
압력 등급	Class 300 LB (PN50)
End Connection	Butt-Weld Ends (BW) per ASME B16.25
본체 재질	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

매개변수	Value / Range	비고
압력 등급	Class 300 LB (PN50 / 5.0 MPa)	Working pressure per ASME B16.34
공칭 크기	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
밀봉 메커니즘	Bellows Seal + Packing	Double sealing system for zero leakage
작업	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.

요소	Material (ASTM)	비고
몸	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
줄기	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
압력 등급: Class 300 LB
연결 종료: ASME B16.25에 따른 맞대기 용접(BW)
본체 소재: 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.
인증: 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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