Protective drain

Details Protective drain Protective drain

1984-05-21

1986-06-17

Artis, Henry K.

Baths, closets, sinks, and spittoons

Strainer, stopper, plug or closure

Combined strainer, plug, or valve

4288, 4292, 4295, 137844, A47K 114, E03C 126

Patent

active

045947392

ABSTRACT:
A floor drain for hazardous environments comprises a grating, a housing, and an elastic one-way valve clamped by a flange between the grating and the housing. The valve has a tubular body with contacting parallel wall portions which open when a liquid enters the valve. The valve closes when there is no pressure at the inlet. The valve closes more tightly in the event of elevated down stream pressure, positively preventing the escape of gas. An existing, unprotected drain can be retrofitted with the one-way valve.

REFERENCES:
patent: Re31561 (1984-08-01), Thompson
patent: 225776 (1880-03-01), Wilson
patent: 2629393 (1953-02-01), Langdon
patent: 2793371 (1957-05-01), Vesconte
patent: 2822819 (1958-02-01), Geeraert
patent: 2859452 (1958-11-01), Seewack
patent: 2922437 (1960-01-01), Rippingille
patent: 3420552 (1969-01-01), Mork
patent: 3491791 (1970-01-01), Polk
patent: 3903942 (1975-09-01), Vest

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