Beautiful appearance, segmented production, easy installation, maintenance, long service life. The outer tube, elbow and outer tube ripple compensator are all made of polished stainless steel. The vacuum pipelines are connected by vacuum flanges, which is convenient for installation, disassembly and maintenance. Less cooling loss of vacuum tube is ensured. The sealing vacuum is less than 1.33 × 10-3 pa, and the leakage rate is less than 2 × 10-13 pa · m ~ 3/s. The cleaning and drying of materials are strictly controlled according to the oxygen medium. Therefore, this product is used in food, medical, metallurgical, chemical, mechanical, medical and defense, scientific research and other industries with high requirements.