Cryogenic ball valve USES:

This series of ball valve is mainly used in low temperature, such as liquefied natural gas chemical industry device, the output of the cryogenic liquid medium such as ethylene, liquid oxygen and liquid hydrogen. This kind of media not only flammable and explosive, and when temperature gasification, gasification, the volume expansion of hundreds of times. And the medium dint strong, easy to leak, processing and manufacturing more difficult.

Structure feature:

 1, the pressure on a material can withstand the medium temperature changes caused by the expansion and contraction, the structure of the sealing parts, when the temperature changes will not produce permanent deformation. When used to this Conditions that low Below -10℃,it should be carried out before finishing the cryogenic valve parts processing, the spare parts in liquid chlorine tank for cooling. When the temperature reaches -196 ℃,this parts begin to heat preservation 1-2 h. Then remove the outside box natural treatment to normal temperature recirculation 2 times.

2, bonnet with long neck design, its purpose to protect the function of the stuffing box, the packing is in far from low temperature than the location of the sun, the packing sealing effect. At the same time can also be wrapped cold insulation materials, prevent cold energy loss. Long neck long neck can be used according to the temperature and the thickness of the insulating materials to choose different length. When packing seal effect to reduce, can from stuffing box in the middle add grease form oil seal layer, reduce the pressure difference of stuffing box, improve the sealing performance.

3, using the temperature lower than 100 ℃, the valve stem material after chrome plating or nitriding process, to improve the surface hardness of the valve stem, to improve the reliability of the packing.

 4, the structure of the cryogenic ball valve is to prevent abnormal pressure. Because of the cryogenic valves after gasification medium, its volume JiJu expansion, abnormal pressure will heat up. When the valve lumen pressure rises, the valve lumen and inlet side connected, or placed on the valve inlet end pressure release valve. Ensure safe use of the valve.

5, cryogenic ball valve with gasket at room temperature, under low temperature condition and temperature change can reliable sealing and resilience.