Year: 1899

page_text: Date of Application, 19th July, 1899
Complete Onncifination last CAL A
1000
1000
Date of Application, 19th July, 1899
Complete Specification Left, 10th Apr., 1000 Accepted, 19th May, 1900
We, GOMER SWEETING MORGAN, of Llantrisant Road, Pontyclun, Glamorgan,
Civil Engineer, and WILLIAM WILLIAMS, of Bryn-Derw, Plymouth Road,
Penarth, Glamorgan, Doctor of Medicine, do hereby declare the nature of this
invention to be as follows:-
This invention relates to the flap valves or swinging doors commonly employed
in drains and sewers. Such doors are so hung that they open under the pres-
sure of the flow of sewage or other liquid, and allow it to pass, while at the
same time they partially obstruct the passage, in the reverse direction, of sewer
gas or foul air which is thus, to such extent, prevented from entering the section
of drain or sewer in front of the flap valve or swinging door.
Hitherto the practice has been to make such flap valves or doors rigid or in-
flexible. Consequently, however shallow the stream of sewage or other liquid
may be, the entire door is moved by it, and thus even a small flow of liquid
causes a considerable opening to be offered to the entry of sewer-gas and foul air
into the section of sewer from which the liquid is flowing.
Now, according to this invention, the flap valve or swinging door is jointed at
intervals in such manner as to present a series of jointed sections. The joints
are so made that only the lower section opens when the depth of liquid does not
rise above its top. With a greater depth the next section opens, and so on with
each successive section until the top section is reached and when this occurs
the entire door is open. It will be seen that with a flap valve or swinging
door made in accordance with this invention the extent of side opening for the
passage of gas and foul air is controlled and depends on the depth of the stream
of liquid acting upon the face of the valve or door.
Dated this 18th day of July 1890
NICHOLAS WATTS,
Chartered Patent Agent, Bristol.
An Improved Flap Valve for Sewers.
We, GOMER SWEETING MORGAN, of Llantrisant Road, Pontyclun, Glamorgan,
Civil Engineer, and WILLIAM WILLIAMS, of Bryn-Derw, Plymouth Road,
Penarth, Glamorgan, Doctor of Medicine, do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
This invention relates to the flap valves or swinging doors commonly employed

page_text: in drains and sewers.
Such doors are so hung that they open under the pressure
of the flow of sewage or other liquid, or of solids and liquids travelling together,
and allow it to pass, while at the same time they partially obstruct the passage,
in the reverse direction, of sewer gas and foul air which is thus, to such extent,
prevented from entering the section of drain or sewer beyond the flap valve or
swinging door.
Hitherto the practice has been to make such flap valves or doors rigid. Con-
sequently, however shallow the stream of sewage or other liquid may be, the
entire door is moved by it, and thus even a small flow causes a considerable
opening to be offered to the passage of sewer gas and foul air into the section
of sewer from which the liquid is flowing.
Now, according to this invention, the flap valve or swinging door is jointed
at intervals in such manner as to present a series of jointed sections.
The joints
are so made that only the lower section opens when the depth of liquid does not
rise above a certain level. With a greater depth the next section opens, and so
on with each successive section until the top section is reached and when this
occurs the entire door is open. It will be seen that with a flap valve or swinging
door made in accordance with this invention the extent of side opening affording
a way for the passage of gas and foul air is controlled by the depth of the stream
acting against the valve or door.
Referring to the accompanying drawings, Fig. 1 is a front view of a flap
valve or swinging door constructed and fitted, in accordance with this invention,
to a drain pipe. Fig. 2 is a longitudinal section.
The door is made up of sections a, b and c, of which a is hinged at a¹ to b, b is
hinged at to c, and c is hinged at c¹ to lugs & bolted to the flange e of the
drain pipe f. The hinge pin a is passed into eyes g formed in the straps g¹
which are secured by rivets or bolts to the section of the door. The hinge
pin is passed into the eyes h formed in the straps h¹ secured to the section b
of the door by the rivets h². The hinge pin c¹ passed into the eyes i formed
in the straps ¹ secured by rivets to the section c of the door. The hinge pins
are screw-threaded at one end, and upon these ends are nuts j which are screwed
up sufficiently to allow of easy working of the sections. The nuts j are then
locked in the adjusted position by the outer nuts k. At or about midway in the
door, that is to say, at 7, Fig. 1, the hinge pins are made rectangular or square
so that they may be held stationary by a spanner or the like whilst the nuts are
being adjusted. At Fig. 3 is shown a sectional view of a part of a sewer
including a manhole m and further illustrates the practical application of the
jointed door in which this invention consists.
While the sewage or other liquid, or solid and liquid together, flowing in the
pipe remains below a certain level, only the lower section a of the door is
opened. When the said level is exceeded the section 6 opens, but section c
remains closed until the sewage or other liquid rises above a further given
level. When this further level is reached, the upper section c opens. The
sections as successively opened are shown in dotted lines at Fig. 2.
Sewer and drain swing doors constructed in accordance with this invention
have the advantage that the door does not always open throughout its entire length
but in varying degree of length according to the volume of the sewage or other
liquid acting against it. Consequently, the area of opening at the sides by
which sewer gas and foul air can pass beyond the door is also controlled as such
sewer gas and foul air can pass only at the sides of such of the door sections as
are open.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
A flap valve or swing door for sewers, consisting of sections or lengths hinged
or jointed together transversely in such manner that the second section from the

page_text: bottom does not swing open until the sewage or other liquid has reached a
certain level, and similarly the third does not open until a further higher level
is reached, and so on for each successive section, substantially as hereinabove
described with reference to the accompanying drawings.
Dated this 18th day of April 1900.
NICHOLAS WATTS,
Chartered Patent Agent, Bristol.