Single flange SSJ and double flange VSSJ of expand and contract joint of valve pipeline are up to the state standard and all products possess the characteristics of wear-resisting, heat-resisting, reliable airtight property and so on, pipeline can expand and contract freely inside at any condition, VSSJ Series are more easy when change the gate valve with wafer, butterfly valves. We can also provide special spare parts various kinds of pipes. Our expertise is Large Industrial valve for water supply, power plant, civic water supply, sewerage and discharge, chemical industries, petrol transportation and so on.