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Low temperature liquid storage tank

Low-temperature liquid storage tanks are specialized vessels designed to store cryogenic fluids such as liquefied natural gas (LNG), liquid hydrogen (LH₂), liquid oxygen (LO₂), and liquid nitrogen (LN₂) at extremely low temperatures (ranging from -162°C for LNG to -269°C for liquid helium). These tanks are critical in industries like energy, aerospace, and healthcare, enabling the safe and efficient handling of cryogenic materials.

Low temperature storage tank

Air separation equipment

Air separation equipment is a critical industrial technology that extracts pure oxygen, nitrogen, and argon from ambient air through various physical and chemical processes. These systems are widely used in industries such as steelmaking, healthcare, chemical production, and electronics manufacturing.

Air separation equipment

Air-heated vaporizer

An Air-heated Vaporizer (also known as an ambient vaporizer) is a heat exchanger that converts cryogenic liquids (e.g., LNG, LPG, LOX, LIN) into gaseous form using ambient air as the heat source. It is widely adopted in energy, industrial gas, and urban gas supply sectors due to its energy efficiency, low maintenance, and safety

Air-heated vaporizer

Skid-mounted nitrogen and oxygen generator

The skid-mounted nitrogen generator is a modular nitrogen production equipment that integrates air compression, purification, and separation. It has the advantages of rapid deployment, small footprint, and easy operation, and is widely used in petrochemical, new energy, food and pharmaceutical industries.

Skid-mounted air separation unit

Product introduction

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Ultra - low temperature valves: High - performance Solutions for Extreme Cold Conditions

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Technical specifications DN10~DN100

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Model DN10~DN100

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Detail

Cryogenic Valve Selection

Cryogenic valves generally refer to valves suitable for working conditions of -40℃ and below. They are mainly used to control the flow of cryogenic media (such as LNG, liquid oxygen, liquid nitrogen, etc.), and their model naming and product characteristics are all designed around cryogenic adaptability.

1. Classification of Common Cryogenic Valve Models

The model of a cryogenic valve usually consists of components such as "valve type + driving method + connection form + structural feature + sealing material + pressure class + valve body material". The typical models of different types of valves are as follows:

Valve Type	Typical Model Example	Core Application	Applicable Temperature Range
Cryogenic Gate Valve	DZ41H-16C	Used for cutting off or connecting large-diameter and large-flow media, e.g., at the outlet of LNG storage tanks	-196℃ to -40℃
Cryogenic Ball Valve	DQ41F-25P	Applied in scenarios requiring quick opening/closing and high sealing performance, e.g., emergency cut-off of cryogenic pipelines	-196℃ to -40℃
Cryogenic Globe Valve	DJ41Y-40I	Suitable for occasions needing precise flow regulation, e.g., liquid pipelines of air separation equipment	-196℃ to -40℃
Cryogenic Check Valve	DH41H-16C	Prevents backflow of cryogenic media, e.g., at the outlet of pumps or inlet/outlet of heat exchangers	-196℃ to -40℃

Model Explanation: Taking "DZ41H-16C" as an example, "D" stands for cryogenic, "Z" for gate valve, "4" for flanged connection, "1" for rising stem wedge-type single disc, "H" for sealing surface material (Cr13 series stainless steel), "16" for nominal pressure (1.6MPa), and "C" for valve body material (carbon steel).

2. Core Characteristics of Cryogenic Valve Products

Low-Temperature Resistant Materials: Valve bodies are mostly made of low-temperature carbon steel (e.g., LCB) and stainless steel (e.g., 304, 316L). Sealing elements often use polytetrafluoroethylene (PTFE) or metal seals to prevent material brittleness and cracking at low temperatures.

Deep Cryogenic Treatment Process: Before leaving the factory, valves undergo deep cryogenic treatment at -196℃ (or the temperature corresponding to the working condition) to eliminate internal material stress and ensure structural stability at low temperatures.

Low-Leakage Sealing: Double-seal or bellows-seal structures are adopted to reduce the volatilization loss of cryogenic media and prevent external moisture from entering the valve interior to form frost or ice.

Low-Temperature Thermal Insulation Design: Some valves are equipped with insulation jackets or thermal insulation layers to reduce cold loss and avoid condensation or icing on the valve surface, which may affect operation.

3. Main Application Scenarios

Energy Industry: LNG receiving terminals, liquefaction plants, and natural gas liquefaction units, used for the storage, transportation, and loading/unloading of LNG.

Air Separation Industry: Pipelines for the production, storage, and transportation of liquid oxygen, liquid nitrogen, and liquid argon in air separation equipment.

Chemical Industry: Media control for cryogenic reaction kettles and cryogenic storage tanks, e.g., for low-temperature chemical raw materials such as ethylene and propylene.

Pharmaceutical Industry: Cutting off and regulating media in liquid nitrogen storage tanks and low-temperature freezing equipment.