Flanged Cryogenic Ultra-Low Temperature Withstanding -196 Degeree C Side Entry Manhole Triple Offset Butterfy Valve for LNG

Product Description

The Main Categories of This Valve The triple offset cryogenic butterfly valve utilizes a unique three-offset geometry to ensure frictionless disc rotation and zero-leakage bi-directional shutoff. Featuring an extended bonnet to protect stem packing from cryogenic temperatures, it employs a metal-to-metal seat for fire-safe, tight sealing. Designed for -196°C services like LNG and liquid nitrogen, it provides reliable on-off and modulating control in critical low-temperature applications.
Catergory of Valve	Structural Classification	Connection	Operation Method	Other Addition	Remarks
Butterfly Valve	Triple Offset	Double Flange	Worm Gear
The characteristics of each aspect are detailed in the following content.

Triple offset cryogenic butterfly valve

1. Triple-offset frictionless design: Three offsets enable instant disc lift-off from seat during operation, eliminating friction and wear while ensuring low torque and long service life.

 

2. Extended bonnet for cold insulation: Lengthened bonnet keeps packing box away from cryogenic zone, maintaining ambient temperature to prevent ice-induced stem seizure and ensuring reliable sealing.

 

3. Metal-to-metal bidirectional sealing: Metallic sealing pair with fire-safe performance withstands -196°C cryogenic media, delivering zero-leakage bidirectional shutoff.

 

4. Optional maintenance access port: Body can be equipped with manhole (access port) enabling on-site seat and seal ring replacement without pipeline removal, minimizing downtime and maintenance costs.

 

5. Blowout-proof stem and anti-loosening connection: Stem features blowout-proof design; disc-to-stem connection prevents seizure and torque increase at cryogenic temperatures for operational safety.

Bottom

Front

Smart Eelctric Actuator

Cryogenic Valve with Maintenance Port 

----The cryogenic butterfly valve with a manhole represents an advanced design evolution over the standard cryogenic butterfly valve. Its key enhancement is the integration of a dedicated access manhole, which enables direct online inspection and maintenance of internal components without the need to remove the valve from the pipeline. This feature significantly reduces downtime, greatly improves maintainability, and enhances overall operational efficiency of the system. 

Cryogenic Valve

Cryogenic valves 

Cryogenic valves are primarily engineered for services involving liquefied gases at temperatures as low as -196°C (-321°F) and below. They are critical for ensuring safety and operational continuity in processes where standard materials would become brittle and fail.

The typical applications for cryogenic valves include:

1. Liquefied Natural Gas (LNG) Industry: This is the dominant application area. Cryogenic valves are essential across the entire LNG value chain, including liquefaction, storage, transportation (on ships and trucks), and regasification. They must reliably handle cryogenic media at temperatures of -162°C to -196°C (-260°F to -321°F), often under high pressure and in services with frequent thermal cycling.

2. Hydrogen and Air Separation: The growing hydrogen economy demands valves capable of withstanding -253°C (-423°F) for liquid hydrogen storage and transport. Similarly, air separation units (ASU) that produce liquid oxygen, nitrogen, and argon rely on valves operating at -196°C (-321°F).

3. Scientific Research and Biomedical: In cutting-edge fields like superconductivity and aerospace testing, valves are needed for liquid helium systems at -269°C (-452°F). In biomedical applications, they control the flow of liquid nitrogen for the cryogenic storage of vaccines and stem cells, requiring strict cleanliness to prevent contamination.

To meet these extreme demands, cryogenic valves are designed with specific features:

 -- Specialized Materials: They are constructed from materials like austenitic stainless steels (e.g., CF8M, 316L) and nickel alloys (e.g., Monel, Hastelloy) that maintain their toughness and resist brittle fracture at ultra-low temperatures.

 -- Critical Manufacturing Processes: Key components undergo a deep cryogenic treatment (e.g., soaking in liquid nitrogen) to stabilize the metallurgical structure and prevent dimensional changes during service.

--  Robust Design Features: A key design element is the extended bonnet (or long neck), which protects the packing from the cryogenic temperature, prevents freezing, and reduces heat ingress into the system. Furthermore, the sealing surfaces are often hard-faced with alloys to ensure leak-tight shut-off in demanding conditions.

Specification of Basic Valve

Triple-offset butterfly valve

Triple-offset butterfly valve uses three geometric offsets (axial, radial, and angular cone axis) to enable rapid disengagement/engagement of the disc from the seat during operation, drastically reducing friction and wear while achieving near-zero leakage with metal-to-metal sealing. Compact, heatresistant, and highpressure capable, it offers long service life and low torque, making it ideal for demanding services in oil, chemical, and power industries.

Structural Characteristics

1) Axial offset: stem axis deviates from valve centerline, creating a cam effect during disc movement to reduce initial seating force.

2) Radial offset: stem axis deviates from pipe centerline, ensuring rapid disc seat separation during rotation, minimizing friction travel.

3) Angular (cone) offset: sealing cone axis is angled to the flow passage axis, enabling uniform wedging at closure and instant release at opening.

4) Metal hard sealing: laminated or solid metal to metal sealing pairs, no soft materials, resistant to high temperature, erosion, and corrosive media.

5) Bidirectional pressure capability: geometric design allows equal sealing performance in both flow directions, no mandatory installation orientation.

6) Flexible actuation: compatible with manual, pneumatic, electric, or hydraulic actuators, plus smart positioners and fieldbus, enabling remote modulation, on/off control, and seamless integration with DCS/PLC systems.

Technical Specifications (Custom configurations available upon request.)
Valve Body material	Carbon Steel WCB, A105, Stainless Steel SS304, SS316, SS316L, duplex steel 2205, 2507, Bronze C95400, C95800, etc.
Valve Disc material	Carbon Steel WCB, A105, Stainless Steel SS304, SS316, SS316L, duplex steel 2205, 2507, Bronze C95400, C95800, etc.
Valve Seat material	stainless steel, hard alloys, Inconel, Stellite, etc
Pressure Rating	PN0.6~PN6.3 MPa, or Class 150~Class 1500
Connecting Size	2"~96", DN50~DN2400 or larger
Connecting type	Flange, Wafer, Lug, Welded etc...
Applicable Temp	typically from cryogenic (e.g., -196°C) to high temperature (e.g., +600°C or up to +815°C), depending on materials
Applicable Medium	Water, Steam, Oil, Natural gas, etc
Sealing & Leakage Class	Metal-to-metal seating with bidirectional or unidirectional bubble-tight shut-off, up to Class VI per AP 598/ISO 5208.
Actuator & Accessories	Compatible with manual, pneumatic, electric, or hydraulic actuators, plus positioners, solenoid valves, limit switches, etc., for remote control and system integration
Design & Testing Standards	Conforming to 609, EN 593, ASME B16.34, AP 598, etc

Application

(1) Oil, Gas & Chemical: Used in long-distance crude oil and refined product pipelines, high-temperature catalytic cracking and hydrocracking in refineries, and handling corrosive fluids like acids, alkalis, and solvents.

(2) Power & Energy: Applied in boiler main steam and reheat steam lines in thermal plants, cooling systems in nuclear stations, gas turbine inlet/exhaust isolation, and district heating networks.

(3) Metallurgy, Mining & Pulp/Paper: Used in blast furnace gas lines, slurry transport, high-temperature caustic liquor in alumina production, and corrosive fluids in pulp cooking and bleaching stages.

(4) Cryogenic & Ultra-low Temperature Services: Suitable for LNG terminals, liquefied natural gas storage and transport systems, and air separation units handling liquid nitrogen/oxygen at -196°C.

(5) Marine & Offshore Engineering: Applied in ballast water systems, fuel oil transfer lines, bilge discharge, as well as flare vent and firewater systems on offshore platforms.

(6) High-pressure Gas & Storage Peak-shaving: Used in injection and production pipelines of underground natural gas storage facilities, compressed air energy storage systems, and high-pressure nitrogen/hydrogen transmission lines.

Connection of this Valve

The Connection of this Valve is Double Flange Connection

Double Flanged Connection

Features: Integral standard flanges at both ends; rigidly bolted with gaskets to pipe flanges.
Advantages: High rigidity, reliable sealing, strong bidirectional pressure capability; easy alignment during installation.
Limitations: Heavier, longer, and most costly among common types.
Applications: Large diameter high pressure lines, steam systems, and critical process shut off valves.

Our valve products (including butterfly valves, ball valves, gate valves, globe valves, check valves, etc.) are designed to comply with a comprehensive range of flange standards and pressure ratings, ensuring compatibility with diverse regional requirements and service conditions worldwide:

1. Chinese National Standards (GB/T 9112~9124)

 

This standard series integrates both the European PN system and the American Class system, comprising 13 detailed specifications.

 

PN Ratings: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160, PN250, PN320, PN400

 

Class Ratings: Class 15, Class 300, Class 600, Class 900, Class 1500, Class 2500

 

2. American Standards (ASME/ANSI)

 

Widely adopted in high-pressure and high-temperature applications such as petrochemical and power industries.

 

ASME B16.5: Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500, Class 2500

 

ASME B16.47: Class 150, Class 300, Class 400, Class 600, Class 900 (for large-diameter flanges)

 

3. European Standards (EN/DIN)

 

Commonly used in European and international projects, based on the PN system.

 

EN 1092-1: PN 2.5, PN 6, PN 10, PN 16, PN 25, PN 40

EN 593 (Product standard for butterfly valves): PN 2.5, PN 6, PN 10, PN 16, PN 25, PN 40, as well as Class 150 and Class 300 for flange connections

 

4. International Standards (ISO)

 

Internationally recognized reference system for flange connections.

 

ISO 7005-1: Covers both PN and Class series flange standards

ISO 10631 (General metal butterfly valve standard): PN 2.5, PN 6, PN 10, PN 16, PN 25, PN 40, and Class 125, Class 150, Class 300

 

5. Japanese Standards (JIS)

 

Suitable for Japanese-designed equipment or projects exporting to Japan.

 

JIS B2220: 5K, 10K, 16K, 20K, 30K, 40K

 

6. Other Chinese Industry Standards

 

Chemical Industry Standards (HG/T): HG/T 20592 (PN ratings), HG/T 20615 (Class ratings)

 

Machinery Industry Standards (JB/T): JB/T 79~6 series

Contact for more detail if above is not mentioned. 

Operation of This Valve

The Operation of this Valve is Worm Gear Operation

Worm gear actuation converts high speed low torque input (from handwheel or motor) into low speed high torque output through a worm and wheel reducer to operate valves. Its key strengths are effort saving operation, self locking capability, compact design, and high reliability, making it ideal for medium to large diameter valves and applications requiring precise position holding.
 
Main Features
 
1. High Torque Output: Large gear ratio multiplies input torque several to dozens of times, making handwheel operation extremely easy even for large diameter, high pressure valves.
 
2. Self ocking Function: When the worm lead angle is smaller than the friction angle, the mechanism provides reverse self locking, securely holding any valve position without external brakes for enhanced safety.
 
3. Visual Position Indicator: A mechanical opening indicator is typically mounted on the gearbox top, clearly displaying the current valve opening percentage for convenient on site monitoring.
 
4. High Protection Class: Fully enclosed housing offers dust and water resistance (IP65 or higher), suitable for outdoor, humid, or dusty environments.
 
5. Electric Upgrade Ready: The worm gear drive can be retrofitted with a motor adapter without replacing the valve body, enabling quick automation for remote control.

Packaging & Shipping

Our key points to keep in mind when packaging valve products:

1. Protection Against Contamination
Valves must be sealed at all openings (flanges, threaded ends, or socket ends) with appropriate caps, plugs, or covers. This prevents dust, dirt, moisture, and foreign particles from entering the internal cavities and seating surfaces, which could compromise performance.
 
2. Corrosion Prevention
Apply a rust-preventive coating or volatile corrosion inhibitor (VCI) film to all machined and unpainted metal surfaces. Desiccant bags should be placed inside sealed plastic liners to control humidity, especially for long-term storage or ocean freight.
 
3. Cushioning and Shock Absorption
Use adequate padding (e.g., foam, bubble wrap, or corrugated cardboard inserts) to protect actuators, positioners, handwheels, and other protruding components. Fragile accessories like solenoid valves or limit switches require additional isolation from the main valve body.
 
4. Secure Fixation Inside the Container
The valve must be firmly blocked and braced within the outer packaging (wooden crate, corrugated box, or metal rack) using wooden chocks, metal brackets, or strapping bands. This prevents shifting, rolling, or impacting during handling and transit, which could damage threads, flanges, or stem seals.
 
5. Weight Distribution and Lifting Points
For heavy or large-diameter valves, ensure the packaging design evenly distributes weight and provides clear, reinforced lifting points (e.g., sling slots or fork-lift pockets). Mark the center of gravity on the outside to avoid tipping.
 
6. Clear and Durable Labeling
Attach weather-resistant labels showing:
Valve model, size, pressure class, and material grade
Purchase order number and batch/lot code
Handling instructions (e.g., "Do Not Drop," "This Side Up," "Use Spreader Bar")
Weight and center-of-gravity markings
 
7. Compliance with Export/Import Regulations
For international shipments, use Non solid wood material without fumigation wooden pallets/boxes. Include proper hazardous goods declarations if the valve contains residual testing fluids, lubricants, or nitrogen pre-charge.

More Catagory of Butterfly Valve

Concentirc Butterfly Valve

Triple Offset Butterfly Valve

Double Eccentric Butterfly Valve

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