作者: Larry K. Ball
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摘要: A butterfly-type check valve (30) employs a secondary (38) that is carried on the plate (36). The (36) revolvable and translatable relative to pivot shaft (34). In operation, opens in response change aerodynamic forces which act (36), being effected as opening of (38). As rotates an open position, its revolutionary movement (34) changes location points (40) surface (62) plate. This areas (42, 44) both sides so cause still further.