An Improved Combined Syphon Outlet and Non-return Valve for Street Gullies.
Year: 1896

page_text: An Improved Combined Syphon Outlet and Non-return Valve for
Street Gullies.
I, JAMES KING of White Horse Yard, Lower North Street, Poplar, E. Engineer;
do hereby declare the nature of this Invention to be as follows:-
This Invention relates to an improved combined syphon outlet and non-return
valve for street gullies, of the kind for which former Letters Patent were granted
to me dated December 7th 1893 No. 23,601; the object of the present improvement
being to simplify the construction of the syphon outlet and non-return valve and
adapt it to suit gullies of the existing kind in which the outlet to the sewer leads
from the side wall of the gully, so as to avoid the necessity of re-constructing the
gully in order to lead the outlet pipe through the bottom of the gully as described
in my said former Patent.
With this twofold object the valve box is constructed with a circular flange
adapted to be bolted to the correspondingly flanged end of the outlet pipe the
valve chamber being of somewhat the same form as and occupying a corresponding
position to one of the valve chambers described in my former Patent and having
an aperture in its lower side closed by a leather faced Hap valve closing by gravity
and opening inwards and upwards as before. The outlet pipe to which the
valve chamber is bolted as above described is elbowed so that from the valve
chamber it leads in an upward and then in a horizontal direction for attachment
to the wall of the gully over or in connection with the ordinary outlet passage
from the upper part thereof into which the outlet from the valve chamber
discharges.
This improved combined syphon outlet and non-return valve effectually
prevents the escape of sewer gas at all times and the overflowing of storm waters
in low-lying districts in the event of the sewer becoming stopped or overcharged
with water from a higher level. The valve chamber being supported below the
level of the outlet, the valve is always submerged to a considerable depth in the
water within the gully chamber by which the trap is sealed, and as the valve is
closed by back pressure whether of water or sewer gas it is equally efficient in wet
or dry weather, even should the water-seal of the trap dry away.
In practice I should generally employ a pair of valves of the character above
referred to, closing against seats at opposite sides of the valve chamber.
Doted this 3-d dor of Nonember 1908
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.

page_text: COMPLETE SPECIFICATION.
An Improved Combined Syphon Outlet and Non-return Valve for
Street Gullies.
I, JAMES KING of White Horse Yard, Lower North Street, Poplar, E. Engineer;
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 a combined syphon outlet and non-return valve for
street gullies, of the kind for which former Letters Patent were granted to me
dated December 7th 1893 No. 23,601; the object of the present improvement
being to simplify the construction of the syphon outlet and non-return valve and
adapt it to suit gullies of the existing kind in which the outlet to the sewer leads
from the side wall of the gully, so as to avoid the necessity of re-constructing the
gully in order to lead the outlet pipe through the bottom of the gully as described
in my said former Patent.
Reference is to be had to the accompanying drawings forming part of this
Specification wherein Figure 1 is a vertical section of a gully, the combined
syphon outlet and non-return valve being shown (partly in section) in position
therein. Figure 2 is a view at right angles to Figure 1. The same letters of
reference denote like parts in both figures.
With the twofold object of simplifying the construction and adapting the
apparatus to existing gullies the valve box A is constructed with a socket joint B
or with a circular flange on top adapted to receive or be bolted to the spigot or
flanged end of the outlet pipe C. The outlet pipe C to which the valve chamber A
is connected as above described forms a syphon which leads in an upward direction
from the valve chamber and then in a horizontal direction and is affixed to or
passes through the wall of the gulley and is connected to the ordinary outlet pipo
leading from the upper part of the gulley chamber down to the sewer. The valve
chamber A has apertures in its inclined lower sides, each closed by a leather-
faced flap-valve D hinged at d, the valve opening inwards and upwards and
closing by gravity. The valve chamber A is supported by a bracket a (cast in
one with the chamber) which is let into the side wall of the gully, as shewn.
This improved combined syphon outlet and non-return valve effectually pre-
vents at all times the escape of sewer gas and the overflowing of storm waters in
low-lying districts in the event of the sewer becoming stopped or overcharged
with water from a higher level. The valve chamber A being supported below the
level of the bend of the syphon outlet, the valve D is always submerged to a
considerable depth in the water within the gully chamber whereby the trap is
sealed. As the valve is closed by back pressure whether of water or sewer gas,
it is equally efficient in wet or dry weather, even should the water-seal of the trap
dry away.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed I declare that what
I claim is
The herein described combined syphon outlet and non-return valve chamber
arranged within a street gully as described, the non-return valve chamber being
suspended within the gully chamber and having its outlet at top connected with

page_text: the short leg of the syphon outlet, for operation substantially as shewn and
described.
Dated this 3rd day of August 1897.
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.