Baths – closets – sinks – and spittoons – Dry closets – With heating meas
Patent
1991-02-05
1992-01-14
Michalsky, Gerald A.
Baths, closets, sinks, and spittoons
Dry closets
With heating meas
4195, 137218, 137312, E03C 110
Patent
active
050797816
ABSTRACT:
A backflow preventer used in combination with a plumbing fixture has a pressurizable supply line, an output hose that can be equipped with a sprayer or shower, and a drain. It further has a valve casing having an inlet valve seat forming an inlet port connected to the supply line, a vent valve seat forming a vent port opening to the atmosphere, and an outlet port opening laterally between the seats and connected to the supply hose. A valve body is movable in the casing between a normal-flow position on the vent seat blocking the vent and permitting flow between the inlet and outlet ports and a backflow-preventing position on the inlet seat blocking the inlet port and permitting flow between the outlet and vent ports. A spring or the like biases the valve body toward the inlet seat into the backflow-preventing position with a pressure sufficient to overcome atmospheric pressure at the inlet port so as to permit movement of the valve body into the normal-flow position when pressure at the inlet port substantially exceeds atmospheric pressure.
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Advertisement for Molded Foam Insulators, Bisco Products, Inc., undated.
Gnauert Werner
Jensen Hans-Jurgen
Dubno Herbert
Friedrich Grohe Armaturenfabrik GmbH & Co.
Michalsky Gerald A.
Wilford Andrew
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