Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line
Patent
1979-07-18
1981-08-18
Cline, William R.
Fluid handling
Back flow prevention by vacuum breaking
Air vent in liquid flow line
137512, 137541, 1374542, F16K 1506, F16K 4500
Patent
active
042840970
ABSTRACT:
A back flow preventing device is disclosed which prevents the reverse flow of water from a point of use into a water supply system. The device has a casing with coaxially aligned inlet and outlet openings, and containing coaxially aligned inlet and outlet check valves. The coaxial alignment of the inlet and outlet openings, and of the inlet and outlet check valves serves to minimize the pressure drop through the device. Between the inlet and outlet check valves is a diaphragm actuated relief valve which opens to drain the passage between the check valves if they should malfunction or if there is a drop in the supply line pressure sufficient to cause actual or potential reverse flow back toward the supply line. The internally-located inlet and outlet check valves are each removably secured in place by internally-located retaining rings.
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Toro Backflow Preventers, 11/2" and 2", Double Check Model, Toro Technology Center, No. 825-1013.
Becker Bernard B.
Bowman John K.
Randall Cyril A.
Amtrol Inc.
Cline William R.
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