A product use Butterfly check valve is used to pure piping and industrial, environmental protection, water treatment, high-rise building plumbing, stop medium by reverse flow A product features 1, small volume, light weight, compact structure, convenient maintenance 2, the valve plate adopt dual type, the elastic force in spring next moment may, on speed closed Three, for speed closed role reversal, can prevent medium 4, body structure length of small size, good rigidity 5, safe and convenient, can be used in horizontal installation. Two directions vertical Should implement standard 1, flange size: GB/T1724.1-98 2, structure length: GB/T12221-1989, ISO5752-82 A performance parameters Model work pressure (MPa) ℃) applicable temperature (applicable medium body material H76H - 10C ~ 40 1.0 ~ 4.0-29 ~ 425 water, steam, oil carbon steel H76W - 10P ~ 25 1.0 ~ 2.5 of more than 150 nitric acid stainless steel H76Y - more than 150 nitric acid 40P 4.0 of stainless steel Model work pressure(MPa) applicable temperature ((℃) applicable medium body material H76H-10C~40 1.0~4.0 -29~425 water, steam, oil carbon steel H76W-10P~25 1.0~2.5 ≤150 nitric acid stainless steel H76Y-40P 4.0 ≤150 nitric acid stainless steel