Fluid handling – With indicator – register – recorder – alarm or inspection means – Fluid pressure responsive indicator – recorder or alarm
Patent
1994-10-07
1995-10-31
Fox, John C.
Fluid handling
With indicator, register, recorder, alarm or inspection means
Fluid pressure responsive indicator, recorder or alarm
13761419, 251 82, F16K 1518
Patent
active
054620821
ABSTRACT:
A backflow prevention device with a failure indicator designed to determine the functional state of integral backflow prevention device(s) or check valve(s). Check valve(s) are assembled in combination with failure indicator(s) and valve(s) or flow regulation device(s), and is designed to allow a working fluid to flow in the desired direction of fluid flow and prevent backflow. A built in test or procedure enables the functional condition of backflow prevention device(s) or check valve(s) to be determined readily, easily, and reliably.
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Nupro "50" Series Lift Check Valve (Aug., 1990) N-189-3 1 page.
Metraflex "Silent Check Valves" (catalog page from Mechanical Products Catalog-1990) 1 page.
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