Fire extinguishers – Fluid systems – Distributing systems
Patent
1989-04-10
1991-02-12
Peters, Jr., Joseph F.
Fire extinguishers
Fluid systems
Distributing systems
137218, 137557, 169 5, 169 23, A62C 3568, A62C 3560, G08B 1700, E03C 110
Patent
active
049916556
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 may be provided in the backflow prevention device.
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Kannofsky James M.
Peters Jr. Joseph F.
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