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|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||137/218 ; 137/5124 ; 137/51611|
|발명자 / 주소||
|출원인 / 주소||
|인용정보||피인용 횟수 : 12 인용 특허 : 0|
A reduced pressure principle backflow preventer includes downstream and upstream check valves separating an inlet and an outlet from an intermediate zone. A differential pressure relief valve maintains the intermediate zone at a pressure lower than the inlet pressure during potential backflow conditions and vents the zone during potential back siphon conditions. A unitary body member supports a pair of resilient annular valve members and is inserted into a vented housing bore and retained by friction to form the complete backflow preventer. Both valve me...
A backflow preventer comprising a housing having a bore therein including inlet and outlet portions separated by an intermediate zone, vent passage means extending from said intermediate zone, a unitary and relatively rigid body member in said bore overlying said vent passage means, spaced first and second valve seats defined on said body member adjacent said inlet and outlet portions respectively, a first resilient valve member having a first portion held between said body member and the wall of said bore and having a movable second portion engageable w...