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Patented Oct. 15, 1946
Samuel Olson, Chicago, Ill.
Application October 26, 1944, Serial No. 560,444
s claims. (o1. 18a-1)
This invention relates to drainage systems, par
same is not limited to the particular form herein
ticularly as employed in domestic and industrial
shown and described, except in so far as indicated
buildings, for discharging waste matter and water
by the appended claims.
into municipal sewer systems or other drainage'
It is quite common, during a heavy rain storm
5 or in the time of floods, for municipal sewers to
One object of the invention is to prevent the
become so overtaxed that the water in the sewer
sewer water from backing up under flood condi
rises until it backs up into the drainage conduits
tions and overflowing into the various waste out
leading from homes and other buildings, and
lets in a building.
overflows onto basement floors or even through
Another object of the invention is to provide
drain outlets at more elevated positions in the
automatic means responsive to an excessive rise
building, >causing great inconvenience and con
in the level of the water in a sewer and operative
siderable damage. This invention is designed to
to close a valve controlling a drain pipe connect
automatically prevent such occurrences by clos
ing the sewer with a building.
ing a valve positioned at a relatively low levelinY
A further object of the invention is to provide 15 the drain discharge pipefrom a building so as to
a back water valve for the purpose indicated ar
prevent the sewer water from rising above that
ranged to be moved slidably onto its seat with a
point in the discharge pipe.
self cleaning action for removing accumulated
The back water valve structure which serves
debris or other matter encrusted on the valve
this purpose is enclosed in a chamber I which is
20 interposed in the drain conduit and which has
It is also an object of the invention to provide,
an inlet 2 and an outlet 3. A fragment of the
in a drain passage leading from a building to a
conduit leading from the building is shown at 2a
sewer or other outlet, a chamber closed except
and~ a fragment of the conduit leading to the
for an inlet and. outlet by which it is connected
sewer is shown at 3a. The inlet is provided with
into the passage, and containing a float respon 25 an elbow 4 within the chamber I and terminating
sive to liquid level in the chamber, a valve mount
in a downwardly discharging opening having a
ed for movement into position to close the inlet
valve seat 5 adapted to be closed by the valve
and operative connections between the float and
member 6 which is slidable thereover. The valve
the valve by which the valve is closed when the
member is suspended in the chamber I by a pair
level of liquid within the chamber exceeds a pre 30 of links 1, 'I pivotally connected to the Valve at
determined limit.
opposite sides thereof as shown at 8, these pivotal
Other objects and advantages of the invention
connections being aligned , at an axis disposed
will appear from the following description taken
approximately midway between the forward and
in connection with the drawing in which :
rear edges of the valve. An additional link 9 is
Fig. l is a vertical sectional view of a chamber :t: In connected to the valve adjacent its rear edge. All
arranged in accordance with this invention and
the links are swung from a point near the top of
including a back water valve and a ñoat con
the chamber, the link 9 being pivoted to a bracket
nected for operating the same, the section being
I0 and the link 'I extending from'a cross bar II
taken substantially as indicated at line I--I on
v with springs I2 interposed between the cross bar
Fig. 2.
40 and the nuts I3 on the upper ends of these links
Fig. 2 is a vertical section taken substantially
for yieldingly tensioning the link ‘l and thus urg
as indicated at line 2_2 on Fig. 1 and with the
ing the valve member 6 against the seat 5 at all
valve in open position.
positions of the Valve. To avoid tilting the valve
Fig, 3 is a vertical sectional view similar to Fig.
in its sliding movement across its seat the lower
2 but with certain parts shown in elevation and 45 end of the link 9 is provided with a slot 8a engag-l
with the valve shown in closed position.
ing the pivot I4 by which the link is connected to
Fig. 4 is a horizontal section taken as indicated '
the valve.
at line 4-4 on Fig. 2 and showing the mechanism
It may be understood that the valve 6 is nor- y
in plan.
mally open as shown in Fig. 2, with the drain
While there is shown and described herein cer 50 age flowing from the inlet conduit 2e through
tain specific structure embodying the invention,
the inlet 2 and elbow 4 and discharging against
it will be manifest to those skilled in the art that
the floor I5 of the chamber I. This floor I5V
various modifications `and rearrangements of the
slopes toward the outlet 3 through which> the
parts may loe-made without departing from the
drainage Apasses into the conduit 3%, but in the
spirit and scope of the invention, and that the. 55 event ‘of flood conditions, such that the water
backs up in the pipe 3a and starts to rise in the
chamber 2, a float I6 in the chamber will be
elevated as the water level rises therein. rFhis
float is guided loosely for vertical movement be
tween one wall of the chamber I and a tra-ns
versely extending guide member I‘I and is pro
vided with upwardly extending arms I8, IB con
nected by a cross bar I9 and pivotally attached
to the arms 2S, 2B secured to the rock shaft 2i
which extends across the chamber I and is jour
naled on the side walls thereof as shown in Fig. 1.
up beyond the float chamber. The device re
quires no attention for maintenance, and will
automatically reopen the connection between the
The single arm 22 extending downwardly from '
drain pipe and the Sewer as soon as the level of
water in the float chamber has receded upon
cessation of flood conditions. Even though the
mechanism may be inactive for long intervals, any
scum or encrustation accumulating on the valve
will be scraped clean by the first closing move
ment of the valve member insuring effective seat
ing thereof.
I claim as my invention:
` 1. In combination with a sewer drain conduit,
the rock shaft 2l is connected to the link 9 bya
a chamber interposed therein having an inlet and
pivot 23 engaging a float I6 thus swings the arms
anr outlet, the inlet entering the chamber above
20, 2U upwardly and rocks the shaft 2| in a di
the level of the outlet and terminating in an el
rection to swing its arm 22 forward, that is, to
bow discharging downwardly in the chamber
ward the terminal elbow 4 of the inlet, so that
through a downwardly facing valve seat, a nor
the link 9 is thereby moved in a direction to
mally open valve disposed out of the path of ñow
slide the valve 8 over the seat 5 to the closed
20 when in open position, said valve being slidable
position illustrated in Fig. 3.
across said seat to close the inlet against back
Since flood conditions which operate to close
flow, and a float in the chamber with means con
the valve 6 occur only occasionally there may
necting said ñoat to said valve for sliding it to
be some accumulation of debris or solid matter
closing position over the seat in response to a
encrusted on the upper surface of the valve E
rise of liquid in the chamber above a predeter
but the valve seat 5 is formed by a flange en
mined level.
circling the terminal outlet of the elbow á, and
2. In combination with a sewer drain conduit,
the outer edge of this flange is beveled to an acute
a chamber interposed therein having a down
edge at 5a so that as the valve t slides across the
wardly discharging inlet and an outlet, the inlet
seat 5 the sharp edge 5ab acts to shear from the
upper surface of the valve 6 any encrusted ac 30 terminating in a downwardly facing valve seat
disposed above the level of the outlet, a normally
cumulation so as to insure effective seating of the
open valve disposed out of the path of discharge
valve. This action is assisted by the springs i2
when in open position, said valve being slidable
which constantly urge the valve against the seat
across said seat, and a float in the chamber with
and into effective engagement with the shearing
means connecting said float to said valve for
edge ila as the valve moves across the terminal
sliding it to closing position over the seat in re
seat flange 5 toward its closed position. The
sponse to a rise of liquid in the chamber above
tension of the springs I2 may be varied by ad
a predetermined level.
justment of the nuts i3 which are readily acces
3. In combination with a sewer drain conduit,
sible upon removal of the cover 25 of the cham
a chamber interposed therein having a downward
ber I.
ly discharging inlet and an outlet, the inlet ter
It will be noted from Fig. 3 that a compara
minating in a downwardly facing valve seat dis
tively limited rise of the float i6 is sufficient to
posed above the level of the outlet, a valve slidable
shift the valve E to its closed position so that the
across said seat, substantially parailel links sus
valve will actually close before the flood water
enters the inlet conduit 2a leading from the build- ‘ - pended from the upper part of the chamber sup
porting said valve by engagement therewith at
ing and of course all danger of overflow of the
spaced pivot axes, and a float in the chamber
fixtures in the building is eliminated. During
with means connecting said float to said valve for
normal operation, with the valve in open posi
sliding it to closing position over the seat in re
tion, the waste water entering through the inlet
sponse to a rise of liquid in the chamber above a
2 with whatever solid matter it may carry will fall
level, said links including spring
directly onto the inclined floor I5 without com
means tensioned to yieldingly hold the valve to its
ing in contact with the face of the valve 6 and with
seat throughout its slide to closing position.
almost no tendency to encrust the valve seat
4. In the combination defined in claim 3, said
5 which faces downwardly and in the direction
of dow. Accordingly, the valve will tend to keep . ~ Valve seat having its outer rim beveled to an
acute edge engaging the face of the valve for
itself clean so that there should be a minimum
shearing encrusted matter therefrom as the valve
of encrusted matter on the upper surface of the
moves across said seat.
valve iâ to be scraped or sheared off by the bev
5. In the combination defined in claim 3, said
eled edge 5ii of the valve seat when flood condi
tions cause the valve to be moved to its closed 60 means connecting the float to the valve including
a rock shaft having a pair of arms spaced apart
position. As a precaution against any possible
and connected to opposite sides of the lloat re~
accumulation on the under side of the valve seat
spectively, said arms extending in approximate
5, the leading edge of the valve member 8 is
ly horizontal direction from the rock shaft, and a
beveled to an acute edge as seen at E@ in Figures
2 and 3, so that this edge will have a shearing 65 third arm depending in substantially vertical di
rection from the rock shaft and connected to the
action for cleaning the seating surface as the
valve moves to closed position.
6. In the combination defined in claim 3, said
It will be seen that I have devised a relatively
valve having its leading edge beveled to an acute
simple construction, inexpensive to manufacture
and certain in operation, whereby the rise of level 70 edge engaging the face of the valve seat for
shearing encrusted matter therefrom as the valve
of liquid in the float chamber, which is incident
moves across said seat.
to backing up of the water from the sewer, will
automatically shut off the connection between
the sewer and the drainage conduit leading from
the building so that the sewer water cannot back 75
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