1: The Long Neck structure is convenient for wrapping the cold insulation material to prevent the loss of cold energy.
2: The Long Neck valve cover has the function of protecting the stuffing box. Because the sealing of the stuffing box is one of the keys of the cryogenic valve. Leakage will reduce the cooling effect and lead to liquefied gas. At low temperature, with the decrease of temperature, the elasticity of packing gradually disappeared, and the leak proof performance decreased. Due to media leakage, the packing and stem are frozen, which affects the normal operation of the stem and scratches the slurry packing due to the movement of the stem up and down, causing serious leakage. Therefore, it is necessary the ensure that the temperature of the standard part of the packing is above 8℃.
3: The Long-Neck Structure facilitates quick replacement of the main valve parts by removing the bonnet. Since the process piping and valves in the cold section of the equipment are often installed in the “ Cold Box”, the long-neck bonnet can protrude through the wall of the “ cold box”. When replacing the main parts of the valve, it is only necessary to remove and replace the valve bonnet without disassembling the valve body. The valve body and pipeline are welded into one body, which reduces the leakage of the cold box as much as possible to ensures the sealing of the valve. 

1: The Long Neck structure is convenient for wrapping the cold insulation material to prevent the loss of cold energy.
2: The Long Neck valve cover has the function of protecting the stuffing box. Because the sealing of the stuffing box is one of the keys of the cryogenic valve. Leakage will reduce the cooling effect and lead to liquefied gas. At low temperature, with the decrease of temperature, the elasticity of packing gradually disappeared, and the leak proof performance decreased. Due to media leakage, the packing and stem are frozen, which affects the normal operation of the stem and scratches the slurry packing due to the movement of the stem up and down, causing serious leakage. Therefore, it is necessary the ensure that the temperature of the standard part of the packing is above 8℃.
3: The Long-Neck Structure facilitates quick replacement of the main valve parts by removing the bonnet. Since the process piping and valves in the cold section of the equipment are often installed in the “ Cold Box”, the long-neck bonnet can protrude through the wall of the “ cold box”. When replacing the main parts of the valve, it is only necessary to remove and replace the valve bonnet without disassembling the valve body. The valve body and pipeline are welded into one body, which reduces the leakage of the cold box as much as possible to ensures the sealing of the valve.