Backflow prevention device
    1.
    发明授权
    Backflow prevention device 失效
    防回流装置

    公开(公告)号:US4870992A

    公开(公告)日:1989-10-03

    申请号:US138807

    申请日:1987-12-28

    IPC分类号: E03C1/288 E03C1/298 F16K15/14

    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。