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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0048192 (1993-04-20) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 18 인용 특허 : 5 |
An air admittance valve device is disclosed for enabling valve sealing member to remain securely closed against high pressure in a pipe or duct produced from: equipment connected to said pipe or duct e.g. a hydraulic pipeline flusher device; fluid movement within, or as otherwise introduced to syste
An air admittance valve adapted to be affixed to a sanitary drainage vent pipe, said valve opening to admit outside air into said pipe upon presence of a pressure drop within said pipe, said valve comprising: (a) a tubular body member having upper and lower ends, means provided at the lower end for
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