Fluid handling – Freeze condition responsive safety systems – Low temperature responsive drains
Patent
1976-09-27
1978-10-03
Michalsky, Gerald A.
Fluid handling
Freeze condition responsive safety systems
Low temperature responsive drains
137218, 137798, 285 23, 285 39, F16K 2400
Patent
active
041178564
ABSTRACT:
A backflow preventer in a fluid conduit permits flow from the inlet to the outlet of the preventer when the inlet is pressurized and prevents reverse flow upon termination of flow through the preventer. An apertured diaphragm between the inlet and outlet closes a valve seat between the outlet and a vent passage when the inlet is relatively pressurized. A check member upstream of the diaphragm closes the diaphragm aperture if the outlet is relatively pressurized and maintains the diaphragm aperture closed upon pressurization of the inlet until after closing of the vent valve seat. A second vent communicates with the interior of the preventer and is closed by a portion of the diaphragm upon pressurization of the interior. A relief port in the chamber includes a temperature responsive element that opens the relief port once ambient temperature reaches a preselected level. The inlet includes an internally threaded sleeve within the housing that may be secured to an externally threaded fluid hydrant. The sleeve allows the preventer to be attached to a hydrant, but prevents its removal after a key in the sleeve is removed.
REFERENCES:
patent: 2997054 (1961-08-01), Woodford
patent: 3075704 (1963-01-01), Stump
patent: 3294359 (1966-12-01), Bauer
patent: 3446226 (1969-05-01), Canterbury
patent: 3459443 (1969-08-01), Butters et al.
patent: 3543786 (1970-12-01), Woodford
patent: 3850190 (1974-11-01), Carlson
patent: 3952770 (1976-04-01), Botnick
Mark Controls Corporation
Michalsky Gerald A.
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