Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line
Patent
1989-09-29
1990-11-20
Michalsky, Gerald A.
Fluid handling
Back flow prevention by vacuum breaking
Air vent in liquid flow line
137307, 137360, 1374546, F16K 2402, F16K 1107
Patent
active
049710974
ABSTRACT:
Freeze-proof hydrants having a housing, the first end thereof having a fitting for flow communication with a pressurized liquid source. There is a passageway in the housing for liquid flow, a back flow preventer in the passageway and a drain in the housing. A removable cartridge is located in the passageway between the back flow preventer and the first end of the housing. The cartridge has a casing having a passageway therein, a drain therein with a drain channel and at least one hole in the drain channel which extends through the casing, arrangement for retaining the removable cartridge in the passageway, and a plunger in the passageway which can be moved from an open or liquid flowing position to a closed or liquid draining position, and vice versa. The plunger has a plunger head which blocks the passageway in the closed position and which allows liquid flow in the passageway in the open position. The plunger has a body, to which the plunger head is connected, which has at least one passageway therethrough for liquid flow (but which is not in the wall thereof). The plunger blocks the two drains when in the open position. There is communication between the two drains when the plunger is in the closed position. There is also valve operating apparatus, located in the housing so as not to block the liquid flow in the passageway, to move the plunger between the open and closed position.
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Hunley, Jr. Eugene C.
Jozwiak Terry H.
Amtrol Inc.
Michalsky Gerald A.
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