气动低温球阀用于输出液态低温介质如乙烯、液氧、液氢、液化天然气、液化石油产品等，不但易燃易爆，而且在升温时要气化，气化时，体积膨胀数百倍。液化天然气阀门的材料非常重要，材质不合格，会造成壳体及密封面的外漏或内漏;零部件的综合机械性能、强度和钢度满足不了使用要求甚至断裂。导致液化天然气介质泄漏引起。因此，在开发、设计、研制液化天然气阀门的过程中，材质是首要关键的问题。阀体、阀盖采用耐低温不锈钢、耐低温铸钢等特制材质。

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.

低温球阀 分为低温浮动球阀和低温固定球阀两类,对于温度高于-50℃,一般不采用长颈结构,对于温度低于-50℃的球阀,颈部长度T一般为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、对于使用温度小于-100℃的所有阀门零件按照相关规定进行深冷处理，以防止材料产生低温脆性以及低温下因材料相变引起体积变化

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、气动低温球阀采用了长颈结构，使填料工作温度在0℃以上，有效防止填料因工作温度过低而造成密封性能降低甚至密封失效，同时方便对阀门包裹保温材料，防止冷能损失

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、对于浮动球阀采用进口卸压出口密封设计，有效防止了由于温度变化可能造成的中腔异常升压，确保了阀门及管线的安全运行。

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、双层阀杆填料与对压碟型弹片装置气动执行器采用新型GTD系列或ATD系列气动执行器，有双作用式和单作用式(弹簧复位)，齿轮传动，安全可靠;大口径阀门采用AW型系列气动执行器拔叉式传动，结构合理，输出扭矩大，有双作用式和单作用式。

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.