Fluid handling – Diverse fluid containing pressure systems – Fluid separating traps or vents
Reexamination Certificate
1999-06-10
2001-02-27
Rivell, John (Department: 3753)
Fluid handling
Diverse fluid containing pressure systems
Fluid separating traps or vents
C137S247210, C137S247330, C137S247350, C137S247390
Reexamination Certificate
active
06192915
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a sewerage inlet with a grating, a foliage-retaining basin arranged below the grating and a container provided with an outflow pipe, in which a valve controlled by a float is arranged upstream of the outflow pipe and which closes the outflow pipe when the liquid in the container is lighter than water.
BACKGROUND OF THE INVENTION
A sewerage inlet of this type is known from the Utility Model DE 93 11 176. The known sewerage inlet serves the drainage of heating cellars. It is provided with a permanently closed seal, which only opens when water runs in and remains closed, if fuel oil or another liquid which is lighter than water flows into the container.
This known sewerage inlet is unsuitable for the drainage of surface water on streets, grounds, production yards and the like because the container respectively the outflow housing has no storage volume and therefore would overflow already when running off small volumes of water and the float and the valve are arranged such in the discharge current that due to the turbulences occurring there a reliable closing of the valve upon influx of petrol, diesel oil or heating oil cannot be expected.
To protect the groundwater and the surface waters the arrangement of separators in the canalisation is known, in which light liquids such as petrol, benzol, oil or diesel are separated from water.
Despite these separators considerable damages occur frequently when, for example, in the case of a carambolage of a tanker convoy oil or petrol flow into a gully and from there via canalisation into the groundwater or streams or rivers. Here it is to be taken into consideration that the sewage pipes are frequently not joined together tightly and also are not connected tight to the inlet shaft of a gully.
SUMMARY OF THE INVENTION
The present invention is based on the task of creating a sewerage water inlet for roads, grounds or production yards, whereby the described defects of the known sewerage water inlets are avoided and whereby it is ensured that oil and petrol do not get into the canalisation. In doing so the sewerage water inlet should cost only little to manufacture, be easily mounted and be operationally reliable.
This task is solved according to the invention in that the container is subdivided by a removable separating floor into an upper sedimentation chamber and a lower collection chamber, in which the outflow inlet connected with the outflow pipe is arranged with valve and float and the sedimentation chamber is connected via a soil pipe with the collection chamber, the inlet opening whereof being located at a relatively long distance from the separating floor near to the bottom of the foliage-retaining basin and the outlet opening whereof being below the outflow pipe.
With this device a compact multiple-chamber system is created whereby a sedimentation chamber is located below the foliage-retaining basin and above the collection chamber into which collection chamber the sludge found in the sewerage water can settle. Furthermore it is compactly arranged that the path of the sewage from the inlet to the outflow pipe is relatively long and the float and the valve are located in a stabilized efflux zone. In this way it is achieved that the inflowing water, petrol or oil mixture is collected in the collection chamber, the lighter liquid is separated from the water and floats to the surface and the outflow inlet is closed when the water level in the collection chamber has dropped so far that the valve connected with the float settles on the outflow inlet and closes this.
A run-off of oil, petrol or the like into the canalisation is thereby prevented.
The outflow pipe is advantageously connected via a U-shaped, siphon-type manifold with the outflow inlet closable by the valve. On the horizontal outflow inlet there is a conical or spherical closing member, which simultaneously acts as floating member. The weight of this closing member is so counterbalanced that its specific weight is lighter than water but heavier than oil, petrol, benzol or the like. The level of the outflow inlet provided with a sealing lip is somewhat below the lowest point of the outflow pipe.
The float and closing member is fed within an essentially cylindrical housing, which is connected tightly at the bottom with the manifold and has in the upper region perforations, through which the sewerage water flows into the guide housing.
Expediently a valve chamber in which the valve with guide housing is accommodated is separated from the collection chamber via a vertical partition or separating panel. In this partition there is an overflow opening, which connects the valve chamber with the collection chamber. In this way it is achieved that the valve is located in a stabilized zone. For this purpose another coalescence filter is arranged between the overflow opening in the separating panel and the valve, so that droplets of oil in the sewage flowing through the filter are filtered out, rise upwards and settle on the water level.
In the further embodiment of the invention it is suggested that the container be slidably connected with the frame supporting the grating and the frame be supported on a concrete ring, so that the forces acting upon the grating and the frame are not conveyed to the container. The container can advantageously be made of recycled polyethylene.
REFERENCES:
patent: 288655 (1883-11-01), Muirhead
patent: 1067610 (1913-07-01), Ibbeken
patent: 1995742 (1935-03-01), Linnmann, Jr.
patent: 2551404 (1951-05-01), Wiggins
patent: 4026317 (1977-05-01), Ekstrom
patent: 4132238 (1979-01-01), Clark
patent: 4748999 (1988-06-01), Delwiche
patent: 5297367 (1994-03-01), Sainz
Langenberg Hartwig
Valperz Antonius
Hoffman & Baron LLP
Rivell John
Valperz Anke
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