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Патент USA US3070131

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Dec. 25, 1962
Filed Aug. 30, 1961
Patented Dec. 25, 1962
locking strip 15 is reciprocated outwardly to the dotted
line position of FIGURE 2, the ?ap 7 will be prevented
from closing movement from such partially open position
Malcolm J. Brian, 276 Pitt St, Windsor, Ontario, Canada
Filed Aug. 30, 1961, Ser. No. 137,709
1 Claim. (51. 137-523)
by engagement of the locking strip with one side of the
arm 12. However (with the locking strip withdrawn) the
flap 7 may be moved to closed position by swinging the
This invention relates to backwater valves. This appli
cation is a continuation-in-part of application, Serial No.
arm 12 in a clockwise direction (as viewed in FIGURE
1). In such position, the locking strip 15 may be recipro
9,862, ?led February 19, 1960.
cated outwardly whereby the other side of arm 12 will
It is frequent practice to provide a backwater valve in
engage the strip which therefore locks the ?ap in closed
a drain pipe or the like to prevent reverse ?ow in the
pipe such as may occur when the waste water in the drain
age system backs up due to various causes such as the
There has thus been provided a backwater valve the
position of which may be instantly determined by visual
presence of ?ooding conditions in the system. However,
inspection of the indicator arm 12. Moreover, by actua
in many cases, the valve remains in partially open posi 15 tion of the arm 12, the operator can test the operation
tion due, for instance, to fouling of the valve parts by
of the valve throughout its entire range of movement.
obstructions of foreign matter, corrosion, or insu?‘icient
Furthermore, the valve may be locked in various posi
back pressure to seat the valve. In such cases, the func
tions to meet varying conditions of use or employed in
tion of the valve is partially or wholly nulli?ed.
unlocked condition for fully automatic operation.
It is an object of this invention to provide a backwater 20
I claim:
valve of simple construction in which the operator may
A backwater valve comprising a tubular member having
readily determine the position of the valve, in which the
a passage, a valve seat in said passage, an opening in the
opening and closing movements of the valve may be con—
side wall of said tubular member communicating with said
veniently and quickly tested whereby its proper operation
passage, the axis of said opening being disposed normal
may be inspected and, if necessary, corrected, and which 25 to the axis of said passage, a closure plate for said open—
may be effectively locked in either open or closed posi
ing, said closure plate extending horizontally when said
tion as desired.
valve is in operative position, a hinge pin rotatably mount
The invention will be described with reference to the
ed in said member in parallel relation to said closure plate,
accompanying drawing, in which
a ?ap carried by said hinge pin and swingable to a closed
FIGURE 1 is a side elevation of a backwater valve in 30 position with respect to said seat to close said passage and
accordance with the invention, and
to an open position with respect to said seat to open said
FIGURE 2 is a plan view of the valve.
passage, said hinge pin having an end portion extending
In the drawing, 1 is a tubular member having a passage
outwardly of said tubular member, an indicator arm ?xed
1a therein and which is adapted to be inserted in a drain
to said end portion of said hinge pin, said indicator arm
age pipe or the like and in which the drainage ?ow is 35 having an end portion extending upwardly above the plane
normally in the direction of the arrow.
of the outer surface of said closure plate in both said
The passage 1a is provided with an annular valve seat
closed and open positions, said end portion of said arm
2 intermediate the inlet and outlet ends thereof. The
having a pair of opposed converging side edges, and a
member 1 has a circular opening 3 in the top portion
locking strip slidably mounted to move horizontally on
thereof provided with an annular ?ange 4 for reception 40 the upper surface of said closure plate, said locking strip
of a closure plate 5 which may be bolted thereon by
being slidable parallel said upper surface into a locking
bolts 6.
position wherein said strip projects outwardly beyond an
A valve disc or ?ap 7 is swingably mounted in the
edge of said closure plate and a released position wherein
member 1 for closing engagement with the seat 2 and for
said strip is con?ned within the edges of said closure plate,
opening movement with respect thereto. The mounting 115 said strip in said locking position having engagement with
means shown comprises an arm 8 ?xed to the disc 7 and
a selected one of said pair of opposed side edges of said
indicator arm to restrain swinging movement of said indi~
cator arm and ?ap, said strip in said released position be
ing free of engagement with said indicator arm to permit
to a hinge pin 9 rotatably mounted in bearing lugs 10.
One end of pin 9 projects laterally outwardly of the mem
her 1 through a suitable gas and water seal 11.
Fixed to the projecting portion of pin 9 is an indicator 50 swinging movement thereof and of said flap, engagement
arm 12. It will be apparent that, by observing the angu
of said strip with one of said opposed edges of said indi
lar position of the arm 12, the corresponding position of
cator arm de?ning said ‘open position of said ?ap and en—
the flap 7 may be readily determined.
gagement of said strip with the other of said opposed
Moreover, the arm 12 may be utilized to swing the ?ap
edges of said indicator arm de?ning said closed position
7 manually throughout its range of operating movement.
of said ?ap, an operating handle extending upwardly from
For convenience, it is proposed to provide an actuating
said indicator arm, said handle having a recess in its lower
handle 13 for this purpose, such handle constituting an
end, said recess being inwardly tapered so as to slidably
extension of the arm 12 and having a socket 14 com
receive said indicator arm, the outer end of said recess
plementarily shaped for reception of the end portion of
arm 12.
Means are also preferably provided for locking the
?ap 7 in either open or closed position. Such means may
conveniently comprise a locking strip 15 slidably mounted
being substantially larger than the upper end of said arm.
References Cited in the ?le of this patent
on closure plate 5 as by means of pins 16 which extend
through a slot 17 in the strip 15. As shown, the strip 15
is arranged in proximity to the arm 12 and parallel to the
hinge pin 9. With particular reference to FIGURE 1,
it will be observed, that in the upright position of arm
Schaded ____________ __ Dec. 29, 1931
Ruemelin ____________ __ May 3, 1932
Heisser _____________ __ Nov. 3, 1936
12, the ?ap 7 is in partially open position. Now, if the
Forcier _____________ __ Sept. 20, 1921
Ellison ______________ __ Jan. 11, 1955
Downing ____________ __ Sept. 13, 1958
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