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公开(公告)号:US4870992A
公开(公告)日:1989-10-03
申请号:US138807
申请日:1987-12-28
申请人: Lawrence F. Irwin , Frank Irwin
发明人: Lawrence F. Irwin , Frank Irwin
CPC分类号: E03C1/298 , F16K15/147 , Y10T137/6988 , Y10T137/7882
摘要: A backflow prevention device for use in wastelines and the like having a one piece yieldably deformable valving member which permits free flow of liquids in one direction but blocks the flow of liquids and gasses in the opposite direction. Fluid flow through the device is directly proportional to the fluid pressure exerted on the valving member.
摘要翻译: 一种用于废物等的防回流装置,其具有一片可屈曲变形的阀构件,其允许液体沿一个方向自由流动,但阻止液体和气体在相反方向上的流动。 通过装置的流体流动与施加在阀门构件上的流体压力成正比。