ZYB-8 Liquid Nitrogen Pump is designed by making of foot cylinder, a little of liquid nitrogen inside is vaporized, the liquid nitrogen inside the container is pressurized due to the high gas/liquid ratio of liquid nitrogen, so as to release liquid nitrogen from container automatically. It is easily operated, reliable with features of safe releasing and lower vaporizing loss ratio. It is a patent product. And its patent number is ZL 03 2 32947.4.