Back water trap

Details Back water trap Back water trap

1991-12-23

1993-02-09

Rivell, John

Fluid handling

With liquid valves or liquid trap seals

Liquid seal in liquid flow line; flow liquid forms seal

4300, 4DIG15, F16K 1310

Patent

active

051846403

ABSTRACT:
The invention relates to a device for preventing communication through pipe lines of high security institutions. A flapper valve is provided with a valve seat having a plurality of teeth extending into the center of the opening formed in the valve seat. A pivotal flapper opens or closes the valve by abutting a seating face of the valve seat or moving away, under the force of a fluid flow, and allowing passage of waste water from a plumbing fixture to the main waste conduit. A water trap seal is optionally and/or separately mounted for delivering an additional amount of water into the conventional waste trap to fill in the waste trap with fluid and prevent undesirable communication. An independent conduit connected to a water supply deilvers water to a reservoir which is fluidly connected with a conventional jet conduit of a waster system upstream from an outlet point of the jet conduit into the main waste trap.

REFERENCES:
patent: 266485 (1882-10-01), Lightbody
patent: 303822 (1884-08-01), D'Heureuse
patent: 633232 (1889-09-01), Davies
patent: 2482359 (1949-09-01), Molloy
patent: 3871398 (1975-03-01), Finger
patent: 4203173 (1980-05-01), Morris et al.
patent: 4498203 (1985-02-01), Barnum et al.
patent: 4538307 (1985-09-01), Barnum et al.
patent: 4578831 (1986-04-01), Mellinger et al.

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