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

Product Name: Cryogenic Bellows Seal Gate Valve
Connection: Flanged Ends (ASME B16.5)
Nominal Size: 1.5 inches (DN40)
Pressure Rating: Class 300 LB
Body Material: Stainless Steel (CF8 / CF8M / CF3M)

문의하기

Technical Datasheet: Cryogenic Bellows Seal Gate Valve

Product Name: Cryogenic Bellows Seal Gate Valve
Connection: Flanged Ends (ASME B16.5)
공칭 크기: 1.5 inches (DN40)
압력 등급: Class 300 LB
본체 소재: Stainless Steel (CF8 / CF8M / CF3M)

General Design Features

유형: Bellows-sealed gate valve, specifically designed for cryogenic services.
Service Temperature: Designed for cryogenic applications down to -196°C (-320°F) (LNG, Liquid Nitrogen, Liquid Oxygen) .
Seal Design: Zero-leakage to atmosphere via a primary welded metal bellows. A secondary graphite packing provides backup sealing.
Bonnet Design: Extended bonnet construction to ensure the stem packing and bellows assembly remain above 0°C, preventing ice formation and seal failure .
Cryogenic Treatment: All pressure-containing parts are subjected to deep cryogenic treatmentat -196°C to ensure dimensional stability and prevent austenite transformation .
Back Seat: Integral back seat allows for repacking under pressure (if bellows fails) and protects the packing from direct media flow.
작업: Rising stem with non-rising handwheel for visual position indication.

Applicable Standards & Specifications

Item	Standard / Specification
Design & Manufacturing	BS 6364 (Specification for valves for cryogenic service) , API 600, ASME B16.34, GB/T 44916
Face-to-Face Dimensions	ASME B16.10
Flange Connection	ASME B16.5 (Class 300 LB)
Pressure-Temperature Rating	ASME B16.34
Testing & Inspection	BS 6364, API 598, ISO 5208, GB/T 24925
Bellows Standard	ISO 15761 / BS EN 137-1
Fugitive Emissions	ISO 15848-1 (Optional)

Operating Parameters

Item	사양
크기	1.5 inches (DN40)
압력 등급	Class 300 LB (Max 51 bar @ ambient per ASME B16.34)
Shell Test Pressure	77 bar (Hydrostatic, 1.5 x Class 300 rating)
Seat Test Pressure	56 bar (Hydrostatic, 1.1 x Class 300 rating)
Design Temperature	-196°C to +80°C (Cryogenic service)
Suitable Media	LNG, LPG, Liquid Nitrogen (LN₂), Liquid Oxygen (LO₂), Liquid Argon, Ethylene
Leakage Rate	Zero leakage to atmosphere (bellows seal)

Bill of Materials (Stainless Steel Cryogenic Design)

Note: Materials are selected to meet BS 6364 cryogenic requirements .

Item	Part Name	Material Specification
1	몸	ASTM A351 CF8M (316 Stainless Steel Casting)
2	Bonnet (Extended)	ASTM A351 CF8M (316 Stainless Steel Casting)
3	Gate / Wedge	ASTM A182 F316L with Stellite hardfacing (Co-Cr alloy)
4	Seat Ring	Stellite hardfaced (integral with body)
5	Bellows	ASTM A240 316L (Multi-ply Stainless Steel)
6	줄기	ASTM A182 F316L (Austenitic Stainless Steel)
7	Body Gasket	Spiral Wound 316SS + Graphite
8	Packing	Graphite Ribbon Rings (Backup seal)
9	Bonnet Bolting	ASTM A193 B8 / A194 8 (Stainless Steel)
10	Handwheel	Ductile Iron / Fabricated Steel

Dimensional Data (1.5″ – Class 300 LB)

Note: The extended bonnet length (H) is critical for cryogenic service to maintain the packing box temperature above 0°C.

Dimension	Value (mm / inches)	Standard / Reference
Face-to-Face Length (L)	368 mm (14.50 inches)	ASME B16.10
Extended Bonnet Height (H)	Approx. 580 – 620 mm	Required to keep stem seal above freezing point (BS 6364 requirement)
Flange Diameter (D)	190 mm (7.48 inches)	ASME B16.5 (Class 300)
Bolt Circle Diameter (K)	152.4 mm (6.00 inches)	ASME B16.5 (Class 300)
Number of Bolt Holes	8	ASME B16.5 (Class 300)
Bolt Hole Diameter	22 mm (0.88 inches)	For 3/4″ bolts
Weight	Approx. 30 – 40 kg	Dependent on bonnet extension length

Special Requirements for Cryogenic Service (Per BS 6364)

6.1 Deep Cryogenic Treatment

All stainless steel pressure parts shall be thermally cycled to -196°C to stabilize the austenitic structure and prevent dimensional changes during operation .

6.2 Extended Bonnet (Cold Box Design)

The bonnet length must be sufficient to ensure the temperature at the stuffing box is maintained above 0°C to prevent ice formation on the stem and bellows .

6.3 Stellite Hardfacing

Seat and wedge surfaces must be overlaid with Stellite (Cobalt-Chromium alloy) to prevent galling and seizure at cryogenic temperatures .

6.4 Cleanliness & Degreasing

Valves for oxygen service (LO₂) require oxygen cleaning to remove all hydrocarbons and prevent combustion risks.

Inspection & Testing Procedure (Per BS 6364)

Test Type	Procedure	Acceptance Criteria
Shell Test	Hydrostatic test at 1.5 x rated pressure (77 bar) .	No visible leakage through pressure boundary
Seat Test (Ambient)	Hydrostatic test at 1.1 x rated pressure (56 bar) .	No visible leakage across seat
Cryogenic Test	Test at -196°C per BS 6364 Clause 8	Valve must operate without seizure; leakage rate ≤ 100 mm³/s (per nominal size)
Bellows Integrity	Helium leak test	Leak rate ≤ 1×10⁻⁶ mbar·L/s
Operational Torque	Measure at ambient and cryogenic temp	Torque must be within design limits

Features & Benefits

Zero Fugitive Emissions: Welded metal bellows eliminates stem leakage, critical for volatile cryogenic fluids.
BS 6364 Certified: Full compliance with international cryogenic valve standard .
No Icing: Extended bonnet prevents ice formation on stem seals .
Long Cycle Life: Bellows design handles thermal cycling without failure.
Stellite Protection: Prevents galling of stainless steel at cryogenic temperatures .

보증:

SAVVY VALVES는 탁월한 제품 품질과 안심할 수 있는 애프터서비스를 제공하기 위해 최선을 다하고 있습니다. 당사 밸브는 최소 12개월의 서비스 수명을 보장하며, 이 기간 동안 필요한 모든 예비 부품과 자세한 유지보수 지침을 무상으로 제공합니다. 보증 기간 내에 인위적인 손상이 아닌 다른 원인으로 인한 손상이 발생할 경우, 무상으로 부품을 교체하고 전문 기술 지원을 제공합니다. 보증 기간이 만료된 후에는 예비 부품 비용만 지불하시면 되며, 할인된 유지보수 서비스 혜택도 누리실 수 있습니다. 당사의 목표는 신뢰할 수 있는 품질과 포괄적인 애프터서비스를 통해 고객의 운영 비용을 절감하고 생산 효율성을 향상시키는 것입니다. 기술 문의나 유지보수가 필요하시면 언제든지 전문가 팀이 신속하게 대응하여 밸브 시스템이 항상 최적의 성능을 유지하도록 보장합니다.