H44H, H44Y, H44W flange swing check valve products can be done PN420 pressure, DN1200 caliber above, according to the housing and the sealing material is not the same, you can use any of the working medium and any operating temperature range, cast steel swing check valves for water, steam, gas, swing check valves for a variety of medium conditions of water, oil, gas, food, oil, medicine and so on. Standard: Design and manufacture: GB / T12236-89 length of the structure: GB / T12221-89, GB / T15188.1-94 connection type: GB / T9113, JB / T79, HG20592, GB / T1224 test and experiment: JB / T9092-99, GB / T13927-92 swing check valve standards and specifications 1, the design and manufacture: API594, API6D, JB / T8937, GB / T12236 2, length of the structure: API594, API6D, DIN3202, JB / T89373, pressure-temperature rating: SNSIB16.34, DIN2401, GB / T9124, HG20604, HG20625, SH3406, JB / T74 4, test and inspection: API598, JB / T9092 5, pipe flanges: JB / T74 ~ 90, GB / T9112 ! 9124, HG20592 ~ 20635, SH3406, ANSIB16.5, DIN2543 ~ 2548, GB / T13402, API605, ASMEB16.47 http://www.zggnfm.com http://www.gnzhihuifa.com