发明名称 |
Backflow preventer and relief valve assembly |
摘要 |
A backflow prevention assembly designed for connection between a main supply line and a service pipe in water supply service, comprising two check valves in series and a relief valve for draining the chamber between the two check valves under certain operating conditions.
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申请公布号 |
US4044787(A) |
申请公布日期 |
1977.08.30 |
申请号 |
US19760706349 |
申请日期 |
1976.07.19 |
申请人 |
ROCKWELL INTERNATIONAL CORPORATION |
发明人 |
SUTHERLAND, RAY |
分类号 |
E03C1/10;(IPC1-7):E03B7/07 |
主分类号 |
E03C1/10 |
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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