AN IMPROVED COMBINATION OF CHECK VALVE TRAP AND WATER TRAP
Year: 1878

page_text: PROVISIONAL SPECIFICATION left by William Morgan-Brown at the Office
of the Commissioners of Patents on the 4th April 1878. A communication
from abroad by George Waring, of Newport, Rhode Island, United States of
America, Sanitary Engineer.
WILLIAM MORGAN-BROWN, of the Firm of Brandon and Morgan-Brown, Engineers
and Patent Agents, of 38, Southampton Buildings, London, and 1, Rue Laffitte,
Paris. AN IMPROVED COMBINATION OF CHECK VALVE TRAP AND WATER TRAP."
[A communication from abroad by George Waring, of Newport, Rhode Island, United
States of America, Sanitary Engineer.]
This Invention of an improved combination of check valve trap and water trap
consists in the combination of a check valve with a water-sealed trap, by which the
water of the trap is protected against the contact of the drain or pipe leading away
from it.
Prior to this Invention water traps have been used to separate the air of the
waste pipe or drain from the outlet hole of the wash basin, sink, or other vessel.
Flap valves have also been used to effect the same purpose.
This Invention consists in such a combination of the two as shall retain the
advantage of the water seal with the added security of the protection of the water
of the seal from contamination by the absorption of the gases of the drain. Recent
experiments have shown that while an unprotected water seal will prevent the
passage of currents of air not under pressure, it does not prevent a dangerous passage
of foul gases by transmission through the water.
The present Invention prevents the entrance of drain air into the water, and it
also prevents the forcing of the water seal by drain air under pressure.
In the examples represented by the Drawings attached and forming part of this
Specification the combination is shewn applied to a wash basin, Figure 1, and to a
watercloset pan in Figure 2, the like letters indicating corresponding parts.
The letter A designates a trap for retaining a water seal by a depression in the
course of the outlet pipo; B represents a check valve of metal, india-rubber, or
other suitable material, held to its seat by gravitation; C represents a chamber in
Din A1

page_text: the outlet pipe to receive the end of the pipe A and the moveable valvo B; D repre-
sents the continuation of the outlet pipe towards the drain.
The operation of the Invention may be thus described:-Trapping water is
retained in the depression of the waste pipe, as shown at A, and the outlet end of
this portion of the waste pipe is closed by the valve B, which is held to its seat by
its own weight. When water passes into the trap from the wash basin, sink, etc., it
rises against the under side of the valve B, forces it open, and overflows into the
chamber C, passing away through the outlet D. When the flow ceases the valve B
returns to its seat, and closes the trapped pipe A. Foul drain air entering the
chamber C through the outlet pipe D cannot come in contact with the water in the
trap A; also, when drain air, subjected to a pressure as from the rise of water in a
sewer or cesspool, it only closes the valve B more tightly, instead of forcing its way
through the trap A, as is the case when this valve is not used.
Various other devices might be suggested to accomplish this useful purpose, and
I do not wish to confine myself to any particular means for opening and closing the
valve B, nor to any particular form for the construction of the said valve.
It is obvious that the Invention is applicable to bath tubs, laundry trays, urinals,
or all other articles of a similar nature.