Low Emission Cryogenic Gate Valve, BS 6364, A351 CF8, 4 Inch
Key Specifications / Features
The Low Emission Cryogenic Gate Valve Plant specializes in producing high-performance valves designed to meet stringent industry standards. These valves comply with API 600 and BS 6364, ensuring reliability and safety in cryogenic applications. Constructed from ASTM A351 CF8, they offer excellent corrosion resistance and durability. Available in a 4-inch size with a Class 300 LB rating, these valves are suitable for high-pressure environments. They adhere to ISO 15848-1 and API 624 standards, minimizing emissions and ensuring environmental compliance.
Detail Information
Product Name: Low Emission Cryogenic Gate Valve
Type: Wedge Gate Valve
Design Standards: API 600, BS 6364
Body Material: ASTM A351 CF8
Size Range: 4 Inch, DN100
Pressure Rating: Class 300 LB, PN50
End Connections: RF Flanged
Operation: Handwheel
Standards
Testing & Inspection: API 598
Flanged End: ASME B16.5
Face to Face Dimensions: ASME B16.10
Packing Materials: Graphite
Low Fugitive Emission: ISO 15848-1, API 624
Fire Safe Design: API 6FA, API 607
Temperature Range: -40°C to -196°C
Key Features: Extended Bonnet, Bolted Bonnet, Rising Stem, Outside Screw & Yoke
Cryogenic gate valves are designed for controlling the flow of extremely low-temperature fluids, typically ranging from -40℃ to -196℃. These valves are essential in industries handling cryogenic substances like liquefied natural gas (LNG), liquefied petroleum gas (LPG), liquid oxygen (LOX), and liquid nitrogen (LN2), as well as in storage tanks, pipelines, and transportation systems for these volatile materials.
Cryogenic gate valves are primarily used for full shut-off or isolation of flow, rather than throttling. They feature a traveling wedge that moves perpendicular to the flow direction, ensuring minimal pressure drop when fully open and a tight seal when closed. This design prevents leakage, even in high-pressure, low-temperature environments, where the media is highly flammable and explosive.
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FAQs
Low-emission packing systems are specifically engineered to minimize microscopic leakage along the valve stem, which is a common source of fugitive emissions in industrial plants.
Compared with conventional packing, low-emission designs achieve better performance through:
Higher material density control to reduce permeation paths
Pre-compressed or die-formed graphite rings for stable sealing stress
Optimized load distribution using live-loading spring systems
Improved surface finish compatibility with stem materials
These design improvements allow the packing to maintain consistent sealing force even under thermal cycling and vibration. As a result, leakage levels can be reduced to extremely low thresholds (often measured in parts per million), supporting compliance with environmental regulations and reducing operational losses.
Low-emission gaskets are designed to significantly reduce microscopic leakage that may occur under flange stress, thermal expansion, and vibration.
Their performance improvements come from several engineering factors:
Controlled compression behavior, ensuring uniform stress distribution across flange faces
Enhanced material density and recovery, reducing relaxation over time
Improved creep resistance, especially in graphite-based and spiral wound structures
Better surface conformity, allowing sealing even with minor flange imperfections
In modern industrial standards, such gaskets are often tested under rigorous emission protocols (such as ISO 15848 and TA-LUFT), ensuring they meet environmental and safety expectations.
By minimizing fugitive emissions, these gaskets help improve plant efficiency, reduce maintenance frequency, and support environmental compliance.
Basic Concept
Low Emission Valves refer to valves that, through special design and manufacturing processes of the stem packing and mid-seat gasket, control the leakage of media (gases, liquids) to extremely low levels. They are primarily used in industrial scenarios with high safety and environmental protection requirements. The core objective is to reduce or prevent the leakage of harmful media (such as volatile organic compounds (VOCs), toxic gases, flammable and explosive substances, etc.) into the external environment. Therefore, low emission valves offer multiple advantages in terms of energy conservation, emission reduction, reduced safety risks, and environmental pollution.
Key Technical Standards and Leakage Grades
The performance of Low Emission Valves is quantified by their leakage rate, and different industries follow different standards. Common standards include:
1. International Standards
ISO 15848-1: This standard classifies valve leakage grades into four levels: A (the highest requirement), B, C, and D. Grade A requires a leakage rate of ≤100 ppm (by volume).
API 624 (American Petroleum Institute): This standard, applicable to the refining and chemical industries, specifies a leakage rate of ≤100 ppm (for gases) under specific pressures.
EPA Standard (U.S. Environmental Protection Agency): This standard, targeting VOC emissions, requires a leakage rate of ≤500 ppm.
2. Chinese Standards
GB/T 42223-2022: This standard, which references international standards, regulates the design, manufacturing, and testing of Low Emission Valves.
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