The present invention relates to the technical field of plumbing, particularly, but not limited, to residential drainage fittings, although it can also find application in any kind of drainage conduction. The present invention is particularly suitable for easy connection of the drainage piping of a building and is especially suitable to prevent backflow, unpleasant odours in buildings and sewer creatures crawling up the drain pipes.
One way in-line drain valves are commonly used nowadays for preventing backflow of drainage liquids, unpleasant odours migrating towards the interior of buildings and animals crawling up from the sewer system into buildings.
To accommodate the one-way valve 510 (See
To solve the problem of puddling, in-line drain valves have been developed wherein the valve outlet is offset from the valve symmetry axis so that one side of the valve body is common to the outlet and there is no step in which liquid can remain trapped and produce puddling.
However, this solution requires that the valve must be rotationally oriented so that the outlet and valve body common side is in the lowest possible position, when the valve is not essentially vertically positioned.
This drawback can be solved by providing an independently rotatable threaded flange section at one end of the valve body. However, this independently rotatable threaded section is a potential source of leaks and odours and it is not an hermetic closure.
According to a first aspect of the invention there is provided an in-line valve comprising:
a valve body comprising a valve body inlet and a valve body outlet, the valve body inlet and the valve body outlet having a common longitudinal axis with the valve body, the valve body defining a chamber, the chamber having a cross-sectional area larger than the cross-sectional area of the valve body outlet;
a duckbill valve, the duckbill valve having an inlet and an outlet; and
an insert, the insert having an inlet and an outlet, the insert being located within the chamber and being adapted to house the duckbill valve, the insert defining a flow path between the valve body inlet and the valve body outlet such that a first side and a second opposite side of the insert funnel the flow path to an equal or narrower dimension than the valve body outlet.
In at least one embodiment of the invention, by providing an in-line drain valve with an insert that comprises a first side and a second opposite side that funnel the flow path between the valve body inlet and the valve body outlet to an equal or narrower dimension than the valve body outlet, the in-line drain one-way valve can be installed to avoid puddling much more easily and hermetically than with prior art systems. In particular, the in-line valve can be installed in two different rotational orientations in which puddling is avoided, whereas in prior art systems, only one valve rotational orientation is able to prevent puddling.
Preferably the insert inlet is equal or larger than the valve body inlet. In at least one embodiment of the present invention, an insert with an inlet with the same or larger dimensions than the valve body inlet guarantees that no puddling can take place upstream of the insert.
Preferably the insert outlet is equal or smaller than the valve body outlet.
In at least one embodiment of the present invention, an insert with an outlet with the same or smaller dimensions than the valve body outlet guarantees that no puddling can take place within the valve body or within the insert
The insert inlet may comprise a flange. The insert outlet may comprise a flange at least partially surrounding the insert outlet. In at least one embodiment of the present invention by providing flanges to the insert inlet and/or the insert outlet enables the insert to define a more hermetic flow path between the valve body inlet and the valve body outlet because then it is easier for the insert to engage with the valve body inlet and valve body outlet.
The in-line valve may comprise a seal between the flange at least partially surrounding the insert outlet and the valve body. In at least one embodiment of the present invention a seal placed between the flange at least partially surrounding the insert outlet and the valve body effectively seals the gap between the insert outlet and the valve body and avoids leaks towards the valve body from inside the insert.
Preferably the valve body comprises two portions; an inlet portion and an outlet portion. The inlet portion and the outlet portion may be engageable between them.
In at least one of the embodiments of the present invention, a valve body comprising two portions engageable between them facilitates the assembling of the valve.
The insert inlet or its flange may be engageable with the valve body. The insert outlet or its at least partially surrounding flange may be engageable with the valve body.
In at least one embodiment of the present invention, when the insert inlet or its flange is engageable with the valve body and/or when the insert outlet or its flange is engageable with the valve body, it is less likely that, in use, liquid leaks from the interior of the insert towards the valve body.
Optionally the insert outlet may extend into the valve body outlet.
In at least one embodiment of the present invention when the insert outlet extends into the valve body outlet it is less likely that, in use, liquid leaks from the insert interior towards the valve body.
Part of the duckbill valve may be secured between the insert inlet and the valve body.
In at least one embodiment of the present invention when the duckbill valve is secured between the insert inlet and the valve body, it is less likely that, in use, liquid leaks from the interior of the insert towards the valve body.
According to a second aspect of the invention there is provided an insert for an in-line valve, the insert comprising:
an inlet; and
an outlet,
wherein the insert defines a flow path between the inlet and the outlet and wherein a first side and a second opposite side of the insert funnel the flow path to an equal or narrower dimension than the outlet.
Embodiments of the second aspect of the invention may comprise one or more features of the first aspect of the invention or its embodiments, or vice versa.
Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:
Referring to
This embodiment is an in-line valve 1000. The in-line valve 1000 comprises a valve body 1002. The valve body 1002 comprises a valve body inlet 1003 and a valve body outlet 1004. The valve body inlet 1003 and the valve body outlet 1004 have a common longitudinal axis 1001 with the valve body 1002. The valve body 1002 defines a chamber 1008 and the chamber 1008 has a cross-sectional area larger than the cross-sectional area of the valve body outlet 1004. The in-line valve 1000 further comprises a duckbill valve 1005. The duckbill valve 1005 has an inlet and an outlet. The in-line valve 1000 further comprises an insert 1006. The insert 1006 has an inlet 1007 and an outlet 1009. The insert 1006 is located within the chamber 1008 and is adapted to house the duckbill valve 1005. The insert 1006 defines a flow path 1010 between the valve body inlet 1003 and the valve body outlet 1004 such that a first side 1014 and a second opposite side 1015 of the insert 1006 funnel the flow path 1010 to an equal or narrower dimension than the valve body outlet 1004.
In this embodiment the valve body 1002 comprises two portions: an inlet portion 1011 and an outlet portion 1012. The outlet portion 1012 can be threaded onto the inlet portion 1011. This facilitates the assembling of the in-line valve 1000.
The assembling of the in-line valve comprises the following sequence: first, the duckbill 1005 valve is fitted onto a support 1013. Then, the support 1013 and duckbill valve 1005 are inserted into the valve body inlet portion 1011. Then the insert 1006 is placed into the valve body inlet portion 1011, surrounding the duckbill valve 1005. Finally the valve body outlet portion 1012 is threaded onto the valve body inlet portion 1011.
Referring to
The insert 10 is made of rigid polypropylene (PP) by extrusion and blow moulding although other materials and fabrication techniques may be used.
The insert inlet (not visible) is 40 mm of internal diameter, the insert has a maximum width 18 of 40 mm and a minimum width 20 of 20 mm towards the insert outlet 14. The insert outlet 14 has also a maximum width of 40 mm and a minimum width of 20 mm.
The insert inlet (not visible) has a flange 24 of 46 mm of diameter and is 8 mm long.
The insert length 22 is 120 mm and the insert wall thickness is 1.5 mm.
Other dimensions may be used without departing from the principles of the invention.
Referring now to
Features in
This embodiment is similar to the embodiment of
Other dimensions may be used without departing from the principles of the invention.
Referring now to
Features in
This embodiment is similar than the embodiment of
Other dimensions may be used without departing from the principles of the invention.
Referring now to
Features in
This embodiment is similar than the embodiment of
Other dimensions may be used without departing from the principles of the invention.
Number | Date | Country | Kind |
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1418620.9 | Oct 2014 | GB | national |
Filing Document | Filing Date | Country | Kind |
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PCT/GB2015/053123 | 10/20/2015 | WO | 00 |