The GAIRUI Jacket Plug Valves of the American standard heat preservation card is suitable for cutting or connecting pipeline medium on the pipelines of various working conditions, such as oil, chemical, pharmaceutical, chemical fertilizer, electric power industry and so on, which are nominal pressure CLASS150-900LBS and working temperature of -29-180 Degree C. The product is reasonable in structure, reliable in sealing, excellent in performance and beautiful in appearance. Its sealing performance is achieved through the sealing surface around the card sleeve. The unique 360 degree metal lip protection fixed card.