the difference between the butterfly valve American standard and national standard butterfly valve, because the structure is the same, look from the appearance, if not very adept person, may be the difference between the butterfly valve American standard and national standard butterfly valve is not seen. 1, the pressure level is different, American standard butterfly valve for LB pounds, national standard butterfly valve with MPa pressure units. 2, the length of the structure is different, it is mainly used for round type butterfly valve and lug type butterfly valve, flanged butterfly valve structure length is the same as the national standard. 3, 4 is not the same as the wall thickness, flange size is different, involves the flange outer ring, the center hole, pore diameter and pore number, 5, and the flange thickness tolerance is not the same, such as the thickness of the flange, American standard butterfly valve is more demanding, rules can only be thicker than the thickness of the flange standard, and can not be less than, the scope of the national standard butterfly valve allows greater than and less than a certain range. Above is the primary difference between American standard butterfly valve with gb. Many special American standard mold on the market of butterfly valve manufacturers are made by national standards body processed into American standards body, this will lead to wall thickness and thickness of the flange. , the length and width of the structure size is not in conformity with the relevant standards, etc.

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