氣動低溫球閥用于輸出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。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。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。閥體、閥蓋采用耐低溫不銹鋼、耐低溫鑄鋼等特制材質。

Pneumatic low-temperature ball valves are used to output liquid low-temperature media such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc. They are not only flammable and explosive, but also require gasification when heated, and their volume expands hundreds of times during gasification. The material of liquefied natural gas valves is very important. If the material is not qualified, it will cause external or internal leakage of the shell and sealing surface; The comprehensive mechanical properties, strength, and rigidity of the components cannot meet the requirements for use and may even fracture. Causing leakage of liquefied natural gas medium. Therefore, in the process of developing, designing, and researching liquefied natural gas valves, material is the primary and key issue. The valve body and valve cover are made of special materials such as low-temperature resistant stainless steel and low-temperature resistant cast steel.

低溫球閥 分為低溫浮動球閥和低溫固定球閥兩類,對于溫度高于-50℃,一般不采用長頸結構,對于溫度低于-50℃的球閥,頸部長度T一般為250mm。

Low temperature ball valves are divided into two types: low-temperature floating ball valves and low-temperature fixed ball valves. For temperatures above -50 ℃, long neck structures are generally not used. For ball valves with temperatures below -50 ℃, the neck length T is generally 250mm.

1、對于使用溫度小于-100℃的所有閥門零件按照相關規定進行深冷處理，以防止材料產生低溫脆性以及低溫下因材料相變引起體積變化

1. All valve components used at temperatures below -100 ℃ shall undergo cryogenic treatment in accordance with relevant regulations to prevent material brittleness at low temperatures and volume changes caused by material phase transitions at low temperatures

2、氣動低溫球閥采用了長頸結構，使填料工作溫度在0℃以上，有效防止填料因工作溫度過低而造成密封性能降低甚至密封失效，同時方便對閥門包裹保溫材料，防止冷能損失

2. The pneumatic low-temperature ball valve adopts a long neck structure, which enables the working temperature of the packing to be above 0 ℃, effectively preventing the sealing performance of the packing from being reduced or even sealing failure due to low working temperature. At the same time, it is convenient to wrap the valve with insulation material to prevent cold energy loss

3、對于浮動球閥采用進口卸壓出口密封設計，有效防止了由于溫度變化可能造成的中腔異常升壓，確保了閥門及管線的安全運行。

3. The floating ball valve adopts an imported pressure relief and outlet sealing design, effectively preventing abnormal pressure rise in the middle chamber caused by temperature changes, ensuring the safe operation of the valve and pipeline.

4、雙層閥桿填料與對壓碟型彈片裝置氣動執行器采用新型GTD系列或ATD系列氣動執行器，有雙作用式和單作用式(彈簧復位)，齒輪傳動，安全可靠;大口徑閥門采用AW型系列氣動執行器拔叉式傳動，結構合理，輸出扭矩大，有雙作用式和單作用式。

4. The double-layer valve stem packing and pressure disc type spring plate device pneumatic actuator adopts the new GTD series or ATD series pneumatic actuator, with double acting and single acting (spring reset), gear transmission, safe and reliable; The large-diameter valve adopts AW series pneumatic actuator with fork type transmission, with a reasonable structure and high output torque, and is available in double acting and single acting types.