发明名称 |
Backflow prevention device |
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.
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申请公布号 |
US4870992(A) |
申请公布日期 |
1989.10.03 |
申请号 |
US19870138807 |
申请日期 |
1987.12.28 |
申请人 |
AUGERSCOPE, INC. |
发明人 |
IRWIN, LAWRENCE F.;IRWIN, FRANK |
分类号 |
E03C1/288;E03C1/298;F16K15/14 |
主分类号 |
E03C1/288 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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