Combined alarm and back-flow prevention arrangement for fire...

Details Combined alarm and back-flow prevention arrangement for fire... Combined alarm and back-flow prevention arrangement for fire...

A - Human Necessities

62

C

137/67

A62C 35/60 (2006.01) A62C 35/68 (2006.01) E03C 1/10 (2006.01) F16K 15/00 (2006.01)

Patent

CA 1308332

ABSTRACT An alarm valve and a backflow preventer are provided by a check valve and an alarm valve with a passageway provided between the check valve and the alarm valve preferably having a relief valve which selectively drains the passageway in response to the pressure in the main conduit upstream of the check valve. An alarm is sounded when the alarm valve is open. An impeller flow sensor or other detector may be provided in the backflow prevention device.

612077

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