適用于介質溫度-46℃～ -196℃的閥門稱之為低溫閥門。

Valves suitable for medium temperatures ranging from -46 ℃ to -196 ℃ are called low-temperature valves.

低溫閥門包括低溫球閥、低溫閘閥、低溫截止閥、低溫安全閥、低溫止回閥，低溫蝶閥，低溫針閥，低溫節流閥，低溫減壓閥等，主要用于乙烯，液化天然氣裝置，天然氣LPG LNG儲罐，接受基地及衛星站，空分設備，石油化工尾氣分離設備，液氧、液氮、液氬、二氧化碳低溫貯槽及槽車、變壓吸附制氧等裝置上。輸出的液態低溫介質如乙烯、液氧、液氫、液化天然氣、液化石油產品等，不但易燃易爆，而且在升溫時要氣化，氣化時，體積膨脹數百倍。

Low temperature valves include low-temperature ball valves, low-temperature gate valves, low-temperature globe valves, low-temperature safety valves, low-temperature check valves, low-temperature butterfly valves, low-temperature needle valves, low-temperature throttle valves, low-temperature pressure reducing valves, etc. They are mainly used in ethylene, liquefied natural gas devices, natural gas LPG LNG storage tanks, receiving bases and satellite stations, air separation equipment, petrochemical tail gas separation equipment, liquid oxygen, liquid nitrogen, liquid argon, carbon dioxide low-temperature storage tanks and tank trucks On devices such as pressure swing adsorption for oxygen production. The output liquid low-temperature media, such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc., are not only flammable and explosive, but also need to be gasified during heating. During gasification, the volume expands hundreds of times.

液化天然氣閥門的材料非常重要，材質不合格，會造成殼體及密封面的外漏或內漏；零部件的綜合機械性能、強度和鋼度滿足不了使用要求甚至斷裂。導致液化天然氣介質泄漏引起爆炸。因此，在開發、設計、研制液化天然氣閥門的過程中，材質是首要關鍵的問題。

The material of liquefied natural gas valves is very important. If the material is not qualified, it can cause external or internal leakage of the shell and sealing surface; The comprehensive mechanical performance, strength, and rigidity of the components cannot meet the usage requirements or even break. Causing the leakage of liquefied natural gas medium and causing explosions. Therefore, in the process of developing, designing, and developing liquefied natural gas valves, material is the primary and critical issue.

1．設計：API6D、JB/T7749

1. Design: API6D, JB/T7749

2．閥門常規檢查和試驗：按API598標準。

2. Routine inspection and testing of valves: According to API598 standard.

3．閥門低溫檢查和試驗：按JB/T7749。

3. Low temperature inspection and testing of valves: According to JB/T7749.

4．驅動方式：手動、傘齒輪傳動及電動驅動裝置。

4. Drive mode: manual, bevel gear transmission, and electric drive device.

5．閥座形式：閥座采用焊接結構，密封面堆焊鈷基硬質合金，保證閥門的密封性能。

5. Valve seat form: The valve seat adopts a welded structure, and the sealing surface is welded with cobalt based hard alloy to ensure the sealing performance of the valve.

6．閘板采用彈性結構，在進壓端設計卸壓孔。

6. The gate adopts an elastic structure and a pressure relief hole is designed at the inlet end.

7．單向密封的閥門閥體上標有流向標志。

7. The valve body of a one-way sealed valve is marked with a flow direction mark.

8．低溫球閥、閘閥、截止閥，蝶閥采用長頸結構，以保護填料。

8. Low temperature ball valves, gate valves, globe valves, and butterfly valves adopt a long neck structure to protect the packing.

9．超低溫球閥標準：JB/T8861-2004

9. Standard for ultra-low temperature ball valves: JB/T8861-2004

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