CA2450304C - Check valve floor drain - Google Patents
Check valve floor drain Download PDFInfo
- Publication number
- CA2450304C CA2450304C CA002450304A CA2450304A CA2450304C CA 2450304 C CA2450304 C CA 2450304C CA 002450304 A CA002450304 A CA 002450304A CA 2450304 A CA2450304 A CA 2450304A CA 2450304 C CA2450304 C CA 2450304C
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- CA
- Canada
- Prior art keywords
- drain
- valve
- liquid
- check valve
- stop
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
- E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
- E03C1/12—Plumbing installations for waste water; Basins or fountains connected thereto; Sinks
- E03C1/28—Odour seals
- E03C1/298—Odour seals consisting only of non-return valve
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
- E03F5/0407—Floor drains for indoor use
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
- E03F2005/0416—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps with an odour seal
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
- E03F2005/0416—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps with an odour seal
- E03F2005/0417—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps with an odour seal in the form of a valve
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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Check Valves (AREA)
- Sink And Installation For Waste Water (AREA)
- Prevention Of Fouling (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Float Valves (AREA)
Abstract
A method and apparatus (100) for admitting liquid from a draining surface (10) into a drain conduit (110) and for preventing discharge of waste gas from the drain conduit (110) into the atmosphere in response to a higher pressure in the drain conduit (110) than at the draining surface (10).
Description
Title: CHECK VALVE FLOOR DRAIN
TECHNICAL FIELD
The invention relates to drains for building floors, basements, exterior paved areas, and the like. The invention provides floor drain asseinblies and check valves providing improved drainage performance and minimized backflow, particularly where drainage is an irregular occurrence.
BACKGROUND OF THE INVENTION
U-shaped or "gooseneck" traps have long been used in the plumbing industry to prevent backflow of harmful or annoying sewer or pipe gasses into buildings while permitting drainage of unwanted water from floors and other horizontal surfaces. Such traps operate by leaving a small quantity of fluid within the lower portion of a U-shaped trap section to act as a gas barrier. In many applications, however, particularly where access is difficult or where drainage is infrequent, it is disadvantageous to use such drains. Fluid may evaporate from the trap, permitting free flow of obnoxious gases through the drain; insects may breed in the fluid, or in some instances the fluids may harden so as to actually block or restrict flow through the drain. Such conventional drains are also relatively difficult and expensive to install. In addition to floor drain applications, these problems are also common to other areas of fluid control, wherever fluid drainage is an occasional problem.
One solution to these problems has been the use of trap primers, which operate to ensure that a minimum level of fluid is left in the drain to act as a trap for gasses which acculnulate within drains. Trap primers are usually difficult and expensive to install, and require maintenance and constant monitoring to ensure their functionality.
Outside the floor drain environment, the use of check valves has been suggested. As demonstrated herein, check valves can be efficient both in facilitating draining operations and in trapping drain-pipe gasses and preventing backflow. Heretofore, however, no one has suggested placing simple and efficient check valves in floor drains, either alone or in combination or in series with other types of valves.
DISCLOSURE OF THE INVENTION
In accordance with one aspect of the invention, there is provided a check valve floor drain assembly for draining liquid from a draining surface into a drain conduit. The floor drain assembly includes a drain basin having a drain inlet for liquid draining from the draining surface and an outlet for attachment to the drain conduit. The floor drain assembly includes a check valve disposed within the drain basin, the check valve adapted to permit substantially unrestricted flow of liquid from the drain inlet to the drain conduit, and to prevent backflow of gasses located within the drain conduit to the drain inlet.
The floor drain assembly also includes the check valve being constructed entirely from a substantially flexible elastomeric material with memory properties that allow the check valve to open for fluid passage and then return to its original shape; whereby the check valve allows liquid to drain from the draining surface and achieves a seal to prevent backflow of gases from the drain conduit after liquid has drained.
In accordance with another aspect of the invention, there is provided a valve assembly for use in substantially vertically draining drain surfaces. The valve assembly includes a support structure adapted for disposition within a drain basin, the support structure adapted to support a plurality of check valves.
The valve assembly also includes at least two of the check valves removably or interchangeably disposed within the support structure and placed in series so as to form between a first valve and a second valve a chamber, the check valves adapted to permit drainage of a liquid from the drain inlet and from the chamber, and to prevent backflow of gasses located within the drain conduit and the chamber to the inlet, whereby a redundant seal is achieved to prevent backflow of gases in the event one of the serial valves fails to close.
TECHNICAL FIELD
The invention relates to drains for building floors, basements, exterior paved areas, and the like. The invention provides floor drain asseinblies and check valves providing improved drainage performance and minimized backflow, particularly where drainage is an irregular occurrence.
BACKGROUND OF THE INVENTION
U-shaped or "gooseneck" traps have long been used in the plumbing industry to prevent backflow of harmful or annoying sewer or pipe gasses into buildings while permitting drainage of unwanted water from floors and other horizontal surfaces. Such traps operate by leaving a small quantity of fluid within the lower portion of a U-shaped trap section to act as a gas barrier. In many applications, however, particularly where access is difficult or where drainage is infrequent, it is disadvantageous to use such drains. Fluid may evaporate from the trap, permitting free flow of obnoxious gases through the drain; insects may breed in the fluid, or in some instances the fluids may harden so as to actually block or restrict flow through the drain. Such conventional drains are also relatively difficult and expensive to install. In addition to floor drain applications, these problems are also common to other areas of fluid control, wherever fluid drainage is an occasional problem.
One solution to these problems has been the use of trap primers, which operate to ensure that a minimum level of fluid is left in the drain to act as a trap for gasses which acculnulate within drains. Trap primers are usually difficult and expensive to install, and require maintenance and constant monitoring to ensure their functionality.
Outside the floor drain environment, the use of check valves has been suggested. As demonstrated herein, check valves can be efficient both in facilitating draining operations and in trapping drain-pipe gasses and preventing backflow. Heretofore, however, no one has suggested placing simple and efficient check valves in floor drains, either alone or in combination or in series with other types of valves.
DISCLOSURE OF THE INVENTION
In accordance with one aspect of the invention, there is provided a check valve floor drain assembly for draining liquid from a draining surface into a drain conduit. The floor drain assembly includes a drain basin having a drain inlet for liquid draining from the draining surface and an outlet for attachment to the drain conduit. The floor drain assembly includes a check valve disposed within the drain basin, the check valve adapted to permit substantially unrestricted flow of liquid from the drain inlet to the drain conduit, and to prevent backflow of gasses located within the drain conduit to the drain inlet.
The floor drain assembly also includes the check valve being constructed entirely from a substantially flexible elastomeric material with memory properties that allow the check valve to open for fluid passage and then return to its original shape; whereby the check valve allows liquid to drain from the draining surface and achieves a seal to prevent backflow of gases from the drain conduit after liquid has drained.
In accordance with another aspect of the invention, there is provided a valve assembly for use in substantially vertically draining drain surfaces. The valve assembly includes a support structure adapted for disposition within a drain basin, the support structure adapted to support a plurality of check valves.
The valve assembly also includes at least two of the check valves removably or interchangeably disposed within the support structure and placed in series so as to form between a first valve and a second valve a chamber, the check valves adapted to permit drainage of a liquid from the drain inlet and from the chamber, and to prevent backflow of gasses located within the drain conduit and the chamber to the inlet, whereby a redundant seal is achieved to prevent backflow of gases in the event one of the serial valves fails to close.
In accordance with another aspect of the invention, there is provided a drain assembly for use in substantially vertical drainage of drain surfaces. The assembly includes a drain basin having an inlet and an outlet, the outlet adapted for attachment of a drain conduit. The drain basin further includes a plurality of check valves disposed within the drain basin, the plurality of check valves comprising at least one check valve placed in series with a second check valve so as to form a chamber between the first valve and the second valve, the check valves adapted to permit drainage of a liquid from the drain inlet and from the chamber, and to prevent backflow of gasses located within the drain conduit and the chamber to the inlet, whereby a redundant seal is achieved to prevent backflow of gases in the event one of the serial valves fails to close.
In accordance with another aspect of the invention, there is provided a check valve for a floor drain. The check valve adapted for disposition within a floor drain includes a drain sealing surface located proximate to an inlet to the floor drain and a stop adapted for sealing engagement of the drain sealing surface, the stop further adapted to provide substantial flow of liquid in the open position around the periphery of the stop. The check valve also includes a means adapted to urge the stop into sealing engagement with the drain sealing surface, the means adapted to permit disengagement of the stop from the sealing surface as liquid enters the drain, whereby free flowing drainage of liquid is permitted through the floor drain, and backflow of gasses from the floor drain is prevented after liquid has drained.
In accordance with another aspect of the invention, there is provided a side port floor drain apparatus for admitting liquid from a draining surface into a drain conduit and for preventing discharge of waste gas from the drain conduit into the atmosphere in response to a higher pressure in the drain conduit than at the draining surface. The floor drain apparatus includes a housing having circumferential walls with an exterior surface and an interior surface, an open bore extending throughout, a first section, a second inwardly tapered midsection, a third section designed for connection with the drain conduit, and a cover joined over the first section, forming a chamber adapted for connection with the drain conduit. The floor drain apparatus includes a drain port through the walls of the housing having a non-horizontal drain sealing surface on the interior surface, the drain port creating a path for liquid from the exterior surface into the drain conduit. The floor drain apparatus also includes a stop disposed on the interior surface, located between the non-horizontal drain sealing surface and the drain conduit, configured to sealingly engage the drain sealing surface and movably operate within the chamber, and further configured to admit liquid proximate to the exterior surface into the chamber and into the drain conduit and to prevent discharge of waste gas from the drain conduit into the atmosphere in response to a higher pressure in the drain conduit than at the draining surface.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic plan view of a preferred embodiment of a drain assembly according to the invention ;
Figure 2 is a schematic cutaway cross section view of Figure 1 Figure 3 is a schematic cutaway side view of another preferred embodiment of a valve assembly according to the invention;
Figure 4 is a schematic perspective view of another preferred embodiment of a check valve according to the invention;
Figure 5 is a schematic cross-sectional view of the apparatus of Fig. 4.
In accordance with another aspect of the invention, there is provided a check valve for a floor drain. The check valve adapted for disposition within a floor drain includes a drain sealing surface located proximate to an inlet to the floor drain and a stop adapted for sealing engagement of the drain sealing surface, the stop further adapted to provide substantial flow of liquid in the open position around the periphery of the stop. The check valve also includes a means adapted to urge the stop into sealing engagement with the drain sealing surface, the means adapted to permit disengagement of the stop from the sealing surface as liquid enters the drain, whereby free flowing drainage of liquid is permitted through the floor drain, and backflow of gasses from the floor drain is prevented after liquid has drained.
In accordance with another aspect of the invention, there is provided a side port floor drain apparatus for admitting liquid from a draining surface into a drain conduit and for preventing discharge of waste gas from the drain conduit into the atmosphere in response to a higher pressure in the drain conduit than at the draining surface. The floor drain apparatus includes a housing having circumferential walls with an exterior surface and an interior surface, an open bore extending throughout, a first section, a second inwardly tapered midsection, a third section designed for connection with the drain conduit, and a cover joined over the first section, forming a chamber adapted for connection with the drain conduit. The floor drain apparatus includes a drain port through the walls of the housing having a non-horizontal drain sealing surface on the interior surface, the drain port creating a path for liquid from the exterior surface into the drain conduit. The floor drain apparatus also includes a stop disposed on the interior surface, located between the non-horizontal drain sealing surface and the drain conduit, configured to sealingly engage the drain sealing surface and movably operate within the chamber, and further configured to admit liquid proximate to the exterior surface into the chamber and into the drain conduit and to prevent discharge of waste gas from the drain conduit into the atmosphere in response to a higher pressure in the drain conduit than at the draining surface.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic plan view of a preferred embodiment of a drain assembly according to the invention ;
Figure 2 is a schematic cutaway cross section view of Figure 1 Figure 3 is a schematic cutaway side view of another preferred embodiment of a valve assembly according to the invention;
Figure 4 is a schematic perspective view of another preferred embodiment of a check valve according to the invention;
Figure 5 is a schematic cross-sectional view of the apparatus of Fig. 4.
Figure 6 is a schematic cross-sectional view of the apparatus of Fig. 4 with the diaphragm opened by presence of a liquid;
Figure 7 is a schematic cross-sectional view of an alternative preferred embodiment of a check valve floor drain according to the invention;
Figure 8 is a schematic perspective partial section view of another alternative preferred embodiment of a check valve floor drain according to the invention; and Figure 9 is a schematic cross-sectional view of yet another alternative preferred embodiment of a check valve floor drain according to the invention.
BEST MODE OF CARRYING OUT THE INVENTION
Turning now to the drawings, the invention will be described in a preferred embodiment by reference to the numerals of the drawing figures wherein like numbers indicate like parts.
The invention pertains to an apparatus for allowing substantially unrestricted flow from any draining surface while preventing backflow from the drain conduit. References in the specifications and claims to a draining surface, a floor, or the like, mean any surface requiring a drain. The surface being drained could be a roof, a compartment, a sink, a counter top, a floor, an on-grade surface, or a below-grade surface. The surface could be on land or onboard a ship.
Figure 7 is a schematic cross-sectional view of an alternative preferred embodiment of a check valve floor drain according to the invention;
Figure 8 is a schematic perspective partial section view of another alternative preferred embodiment of a check valve floor drain according to the invention; and Figure 9 is a schematic cross-sectional view of yet another alternative preferred embodiment of a check valve floor drain according to the invention.
BEST MODE OF CARRYING OUT THE INVENTION
Turning now to the drawings, the invention will be described in a preferred embodiment by reference to the numerals of the drawing figures wherein like numbers indicate like parts.
The invention pertains to an apparatus for allowing substantially unrestricted flow from any draining surface while preventing backflow from the drain conduit. References in the specifications and claims to a draining surface, a floor, or the like, mean any surface requiring a drain. The surface being drained could be a roof, a compartment, a sink, a counter top, a floor, an on-grade surface, or a below-grade surface. The surface could be on land or onboard a ship.
Specific references to a type surface being drained are to illustrate the invention and not limit its specifications or claims.
Figure 1 shows a schematic plan view of a preferred embodiment of a drain assembly according to the invention. Figure 2 shows a schematic cross section view of the drain assembly 5a of Figure 1. Drain assembly 100 is installed in drain surface 10 so that water or other liquids present on and above the drain surface may drain freely through the drain assembly wllile gasses present beneath the drain remain trapped in place. Drain assembly 100 comprises drain basin 101, which includes inlet 102 and outlet 103; outlet 103 is attached to drain conduit 110. A check valve assembly 120 is disposed with two check valves 125 and 126 being placed in series so as to form chamber 130 within the drain basin. By virtue of their substantially vertical orientation and their design opening or actuating pressures, check valve assembly 120 is adapted to permit drainage of a liquid from said drain inlet and from said chamber, and to prevent backflow of liquids and / or gasses located within said drain conduit and said chamber to said inlet (as shown by arrows 150 in Figure 3). Thus the drain assembly acts as both a drain valve and a trap, without the difficulties and expense of installing prior art p-shaped drain traps, and without the necessity and expense for employing a trap primer.
In preferred embodiments ofthe invention, the substantially vertical orientation ofthe drain assembly and the selection and use of valves having appropriate actuation or opening pressures, prevents substantial amounts of liquid from building up witliin chamber the chamber 130 as liquid drains through the assembly.
Preferably, valves are chosen such that their actuation or opening pressures permit air or other liquids to bleed through the drain assembly in order to relieve any vacuum which may build up in the drain conduit.
The use of more than one check valve, with the valves disposed' in series and adapted to operate independently of each other, helps to ensure proper functioning of the drain, particularly in case foreign matter intercedes between the check valve itself and any surrounding structure in such manner as to prevent the valve from closing properly or completely. This is particularly useful in ensuring that unwanted gasses remain trapped within the drain conduit, and are not permitted to escape into the atmosphere above the drain; and in preventing back flow througli the drain due to floods, etc. This structure also precludes access by insects to liquids in the drain.
A particularly useful optional feature of preferred embodiments of the drain assembly according to the invention is the placement or mounting of the check valves in a removable stiltcture to facilitate cleaning, repair, replacement, or other maintenance of the valves. For exainple, in the embodiment shown in Figures 1 and 2 check valve assembly 120 is mounted in frame 140, which rests upon shoulder 142 in the drain basin. Proper functioning of the drain is aided, in the embodiment shown, by the use of optional sealing ring 143, which is in place between the frame 140 and drain basin 101. Frame 140 is removable from the drain assembly by means of ring 141, or any other structure suitable or mechanism suitable for the purpose.
As indicated above, check valves used with the invention may be of any suitable type. In the einbodiment shown in Figures 1 and 2 flapper valves 121 are used. Flapper valves 121 comprise flexible valve portions 123 and optional substantially rigid back plates 122. The construction and operation of flapper valves, with or without back plates, is well understood by those having ordinary skill in the art, and will not trouble the designer of systems of the type described herein.
Figure 3 is a schematic cutaway side view of a prefeiTed embodiment of a valve assembly 190 according to the invention. In the embodiment shown, first check valve assembly 120 and second check valve assembly 120a each comprise two spring-biased valves 128 and 128a comprising a valve plate 129 and 129a and a spring 127 and 127a. As will be readily appreciated by the artisan of ordinary skill, valves 128 and 128a open under the action of a relatively higher pressure above the drain and a relatively lower pressure beneath the drain. It is to be noted that valve assembly 190 is inserted directly into drain basin 101, which may consist of, for example, an open end of a drain conduit 103. It should also be noted that chamber 130 may comprise either a single annular (or arbitrarily shaped) chamber or a set of multiple chambers between different groups of check valves.
Figure 4 is a schematic perspective view of another preferred embodiment of a check valve according to the invention. Figures 5 and 6 are schematic cross-sectional views of the device of Fig. 4. Check valve 100 is in place in floor drain 10. Check valve 200 comprises diaphragm 203 adapted for sealing engagement of drain sealing surface 201, which when check valve 100 is installed in a floor drain is located proximate inlet 14 of drain 10, such that when diaphragm 203 is sealingly engaged with sealing surface 201, a liquid tight seal is produced between the drain basin 11 or the exterior of the drain and drain conduit 110 attached to the drain. Thus, gasses trapped within the interior of the drain or within drain conduit I 10 are prevented from escaping from the drain.
Most typically, sealing surface 201 is formed by a circumferential rim or other surface disposed about an outlet to the drain conduit, or by a part of a removable housing such as optional housing 210 for check valve 100, which is provided for ease installation or removal. In the embodiment shown in Figures 1 - 3, sealing surface 101 is a part of housing 110, which together with optional gasket 112 serves to form a seal between diaphragm 203 and the wall of drain 110.
Figure 1 shows a schematic plan view of a preferred embodiment of a drain assembly according to the invention. Figure 2 shows a schematic cross section view of the drain assembly 5a of Figure 1. Drain assembly 100 is installed in drain surface 10 so that water or other liquids present on and above the drain surface may drain freely through the drain assembly wllile gasses present beneath the drain remain trapped in place. Drain assembly 100 comprises drain basin 101, which includes inlet 102 and outlet 103; outlet 103 is attached to drain conduit 110. A check valve assembly 120 is disposed with two check valves 125 and 126 being placed in series so as to form chamber 130 within the drain basin. By virtue of their substantially vertical orientation and their design opening or actuating pressures, check valve assembly 120 is adapted to permit drainage of a liquid from said drain inlet and from said chamber, and to prevent backflow of liquids and / or gasses located within said drain conduit and said chamber to said inlet (as shown by arrows 150 in Figure 3). Thus the drain assembly acts as both a drain valve and a trap, without the difficulties and expense of installing prior art p-shaped drain traps, and without the necessity and expense for employing a trap primer.
In preferred embodiments ofthe invention, the substantially vertical orientation ofthe drain assembly and the selection and use of valves having appropriate actuation or opening pressures, prevents substantial amounts of liquid from building up witliin chamber the chamber 130 as liquid drains through the assembly.
Preferably, valves are chosen such that their actuation or opening pressures permit air or other liquids to bleed through the drain assembly in order to relieve any vacuum which may build up in the drain conduit.
The use of more than one check valve, with the valves disposed' in series and adapted to operate independently of each other, helps to ensure proper functioning of the drain, particularly in case foreign matter intercedes between the check valve itself and any surrounding structure in such manner as to prevent the valve from closing properly or completely. This is particularly useful in ensuring that unwanted gasses remain trapped within the drain conduit, and are not permitted to escape into the atmosphere above the drain; and in preventing back flow througli the drain due to floods, etc. This structure also precludes access by insects to liquids in the drain.
A particularly useful optional feature of preferred embodiments of the drain assembly according to the invention is the placement or mounting of the check valves in a removable stiltcture to facilitate cleaning, repair, replacement, or other maintenance of the valves. For exainple, in the embodiment shown in Figures 1 and 2 check valve assembly 120 is mounted in frame 140, which rests upon shoulder 142 in the drain basin. Proper functioning of the drain is aided, in the embodiment shown, by the use of optional sealing ring 143, which is in place between the frame 140 and drain basin 101. Frame 140 is removable from the drain assembly by means of ring 141, or any other structure suitable or mechanism suitable for the purpose.
As indicated above, check valves used with the invention may be of any suitable type. In the einbodiment shown in Figures 1 and 2 flapper valves 121 are used. Flapper valves 121 comprise flexible valve portions 123 and optional substantially rigid back plates 122. The construction and operation of flapper valves, with or without back plates, is well understood by those having ordinary skill in the art, and will not trouble the designer of systems of the type described herein.
Figure 3 is a schematic cutaway side view of a prefeiTed embodiment of a valve assembly 190 according to the invention. In the embodiment shown, first check valve assembly 120 and second check valve assembly 120a each comprise two spring-biased valves 128 and 128a comprising a valve plate 129 and 129a and a spring 127 and 127a. As will be readily appreciated by the artisan of ordinary skill, valves 128 and 128a open under the action of a relatively higher pressure above the drain and a relatively lower pressure beneath the drain. It is to be noted that valve assembly 190 is inserted directly into drain basin 101, which may consist of, for example, an open end of a drain conduit 103. It should also be noted that chamber 130 may comprise either a single annular (or arbitrarily shaped) chamber or a set of multiple chambers between different groups of check valves.
Figure 4 is a schematic perspective view of another preferred embodiment of a check valve according to the invention. Figures 5 and 6 are schematic cross-sectional views of the device of Fig. 4. Check valve 100 is in place in floor drain 10. Check valve 200 comprises diaphragm 203 adapted for sealing engagement of drain sealing surface 201, which when check valve 100 is installed in a floor drain is located proximate inlet 14 of drain 10, such that when diaphragm 203 is sealingly engaged with sealing surface 201, a liquid tight seal is produced between the drain basin 11 or the exterior of the drain and drain conduit 110 attached to the drain. Thus, gasses trapped within the interior of the drain or within drain conduit I 10 are prevented from escaping from the drain.
Most typically, sealing surface 201 is formed by a circumferential rim or other surface disposed about an outlet to the drain conduit, or by a part of a removable housing such as optional housing 210 for check valve 100, which is provided for ease installation or removal. In the embodiment shown in Figures 1 - 3, sealing surface 101 is a part of housing 110, which together with optional gasket 112 serves to form a seal between diaphragm 203 and the wall of drain 110.
In the embodiment shown in Figures 1- 3, flexible diaphragm 203 is formed to engage sealing surface 201. As shown in Figures 1 and 3, diaphragm 203 has sufficient flexibility to flex under action of a liquid (represented by arrows 17) as it enters drain basin 11, and thus to allow drainage of the liquid, and to return substantially to its original, unflexed condition, so that sealing between the diaphragm and the drain sealing surface is restored as the liquid drains. In preferred einbodiments of this aspect of the invention diapliragm 203 is adapted to flex under the action of a preselected head pressure within said drain. This may be accomplished in any number of ways, most of which will occur to those of ordinary skill in the art once they have been exposed to the material herein. For example, diaphragm 203 may be made of a suitable uniform thickness such as thickness 205 shown in Figure 1, or from a variable tliickness tailored for any desired change in flow rate witli respect to pressure, such as thickness 206 in Figures 2 and 3. The structural properties of diaphragms being relatively well known, and hydrostatic pressure being given by the equation sp = pgh, where p = pressure, p'= the specific gravity of the liquid to be drained through the valve, g= the local acceleration due to gravity or other body force acting on the liquid, and h= head, as shown by reference 204 in Figure 5. Thus, is it a straightforward matter for one having ordinary skill in the art, once armed with this disclosure, to select an appropriate head 204 and to design a diaphragm 203 which will deflect suitably in the presence of that head and permit the liquid to drain into the conduit 110.
An optional alternative means for tailoring the deflection of diaphragin 203 under any given head of water or for otherwise increasing or affecting the stiffness of the plate is through the use of a back plate on one side of the diaphragm. Most commonly such a plate will be placed on the drain side of the diaphragm, as shown in Figure 9, but the effect of water accumulating in the drain basin on the diaphragm may be affected as well by placing the back plate before the diaphragm.
Typically a back plate such as plate 107 in Figure 9 will support at least a portion of the diaphragm, and depending upon the stiffness of the diaphragin and the plate may support the entire diaphragm.
In alternative preferred embodiments of this aspect of the invention the check valve comprises a spring or extendable mounting cord adapted to urge the stop into sealing engagement with the drain sealing surface. Such an embodiment is shown in Figure 7. Check valve 300 comprises stop 302 and spring 309, which serves to bias stop 302 into sealing contact with sealing surface 301. As shown in Figure 7, spring 309 is compressed under action of liquid in the drain, the motion of which is represented by arrows 17, so as to allow stop 302 to disengage from sealing surface 301, and therefore to allow the liquid to drain. As will appear to those of ordinary skill in the art, it is a relatively simple matter to select a spring 309 having an appropriate stiffness to allow stop 302 to disengage the sealing surface when a desired level of liquid has accuinulated in the drain. In general, it has been observed that under some circumstances the selection and fabrication of a spring having just the desired stiffness may be more difficult than making a flexible diaphragm of the type described herein having an appropriate flexibility and elasticity.
One advantage of providing check valves according to the invention with on optional housing such as housing 110 or 210 in the Figures is that the housing may be provided with convenient means for installing and removing the check valve in a floor drain.
For example, ring 111 in Figures 4-6 permits removal of the check valve. In addition to providing an attachment for the installation and removal means housing 110 or 120 provides structural support for stop 302 or diaphragm and the biasing means, and optionally a drain sealing surface 201.
In embodiments of the invention coinprising flexible diaphragms 203, the housing may include cross members 114 or other structure to provide direct attachment for the diapllragm, as by means of fastener 115, which may consist of a rivet, nut and bolt, or other mechanical fastener.
Alternatively, the diaphragm may be attached with adhesive or with a bonding process, or integrally molded.
Similarly, diaphragm 203 and spring 309 may be supported by means of cross members 114 and fasteners 115 or by any other suitable method.
It may be seen that check valves according to the invention may be of arbitrary cross section or plan view. That is, they are readily adaptable to use with drains of circular cross section, as in the case of an ordinary drain pipe, or with rectangular conduit or conduit of any other shape.
Einbodiments of the invention adapted for use with pipes or conduits of substantially circular cross section are shown in Figures 4 and 8.
A further advantage of the use of check valves according to the invention is that they may be used singularly, as preferred, or in combination with other valves in any number. For example, two check valves according to the invention may be used in series, or in parallel. One particularly useful combination is shown in Figures 8 and 9, wherein a check valve according to the invention is housed in series with a series of side-port flapper valves 121. Side port flapper valves 121 are set in the side of housing 110 and comprise ports 122 and valve covers 123. A
valve cover 123 is hinged along one edge of each of ports 122 and adapted to open under influence of liquid present in drain basin 11, as shown in Figure 5. In preferred embodiments, valve covers 123 are fabricated from flexible elastic material such as sheet rubber (which may be either natural or synthetic, and coinposed of any suitable material) and are fastened or adhered along the top edge of their associated ports. As in the case of flexible diaphragms 203, valve covers 123 may be tailored by means of thickness (uniform or nonuniform) or material to open under any design hydrostatic pressure. It is advantageous, but not necessary, in making side port flapper valves to provide housing 110 with sloping sides 124, so that valve covers 123 are assisted by gravity or otlier body force in closing, so as to help prevent back flow of gasses from the interior of the drain conduit.
Check valves and associated coniponents of the invention are advantageously made from any suitable materials. For example, diaphragms and stops' may be fabricated from natural or synthetic rubbers, or other suitable pliant and resilient materials, including a great many polymers, while stops and housings may be made of plastics such as PVC or APP, metals, or any of a wide variety of other materials.
With regard to systems and components above referred to, but not otherwise specified or described in detail herein, the workings and specifications of such systems and components and the manner in which they may be made or asseinbled or used, both cooperatively with each other and with the otller elements of the invention described herein to effect the purposes herein disclosed, are all believed to be well within the knowledge of those skilled in the art. No concerted attempt to repeat here what is generally known to the artisan has therefore been made.
INDUSTRIAL APPLICABILITY
The invention has applicability in the field of plumbing and liquid control or removal. In particular, the invention represents improvements in drain systems for floors and otlier surfaces in which infrequent drainage must be reliably and efficiently processed.
In compliance with the statute, the invention has been described in language more or less specific as to structural features. It is to be understood, however, that the invention is not limited to the specific features shown, since the means and construction shown comprise preferred forms of putting the invention into effect. The invention is, therefore, claimed in any of its forms or modifications within the legitimate and valid scope of the appended claims, appropriately interpreted in accordance with the doctrine of equivalents.
An optional alternative means for tailoring the deflection of diaphragin 203 under any given head of water or for otherwise increasing or affecting the stiffness of the plate is through the use of a back plate on one side of the diaphragm. Most commonly such a plate will be placed on the drain side of the diaphragm, as shown in Figure 9, but the effect of water accumulating in the drain basin on the diaphragm may be affected as well by placing the back plate before the diaphragm.
Typically a back plate such as plate 107 in Figure 9 will support at least a portion of the diaphragm, and depending upon the stiffness of the diaphragin and the plate may support the entire diaphragm.
In alternative preferred embodiments of this aspect of the invention the check valve comprises a spring or extendable mounting cord adapted to urge the stop into sealing engagement with the drain sealing surface. Such an embodiment is shown in Figure 7. Check valve 300 comprises stop 302 and spring 309, which serves to bias stop 302 into sealing contact with sealing surface 301. As shown in Figure 7, spring 309 is compressed under action of liquid in the drain, the motion of which is represented by arrows 17, so as to allow stop 302 to disengage from sealing surface 301, and therefore to allow the liquid to drain. As will appear to those of ordinary skill in the art, it is a relatively simple matter to select a spring 309 having an appropriate stiffness to allow stop 302 to disengage the sealing surface when a desired level of liquid has accuinulated in the drain. In general, it has been observed that under some circumstances the selection and fabrication of a spring having just the desired stiffness may be more difficult than making a flexible diaphragm of the type described herein having an appropriate flexibility and elasticity.
One advantage of providing check valves according to the invention with on optional housing such as housing 110 or 210 in the Figures is that the housing may be provided with convenient means for installing and removing the check valve in a floor drain.
For example, ring 111 in Figures 4-6 permits removal of the check valve. In addition to providing an attachment for the installation and removal means housing 110 or 120 provides structural support for stop 302 or diaphragm and the biasing means, and optionally a drain sealing surface 201.
In embodiments of the invention coinprising flexible diaphragms 203, the housing may include cross members 114 or other structure to provide direct attachment for the diapllragm, as by means of fastener 115, which may consist of a rivet, nut and bolt, or other mechanical fastener.
Alternatively, the diaphragm may be attached with adhesive or with a bonding process, or integrally molded.
Similarly, diaphragm 203 and spring 309 may be supported by means of cross members 114 and fasteners 115 or by any other suitable method.
It may be seen that check valves according to the invention may be of arbitrary cross section or plan view. That is, they are readily adaptable to use with drains of circular cross section, as in the case of an ordinary drain pipe, or with rectangular conduit or conduit of any other shape.
Einbodiments of the invention adapted for use with pipes or conduits of substantially circular cross section are shown in Figures 4 and 8.
A further advantage of the use of check valves according to the invention is that they may be used singularly, as preferred, or in combination with other valves in any number. For example, two check valves according to the invention may be used in series, or in parallel. One particularly useful combination is shown in Figures 8 and 9, wherein a check valve according to the invention is housed in series with a series of side-port flapper valves 121. Side port flapper valves 121 are set in the side of housing 110 and comprise ports 122 and valve covers 123. A
valve cover 123 is hinged along one edge of each of ports 122 and adapted to open under influence of liquid present in drain basin 11, as shown in Figure 5. In preferred embodiments, valve covers 123 are fabricated from flexible elastic material such as sheet rubber (which may be either natural or synthetic, and coinposed of any suitable material) and are fastened or adhered along the top edge of their associated ports. As in the case of flexible diaphragms 203, valve covers 123 may be tailored by means of thickness (uniform or nonuniform) or material to open under any design hydrostatic pressure. It is advantageous, but not necessary, in making side port flapper valves to provide housing 110 with sloping sides 124, so that valve covers 123 are assisted by gravity or otlier body force in closing, so as to help prevent back flow of gasses from the interior of the drain conduit.
Check valves and associated coniponents of the invention are advantageously made from any suitable materials. For example, diaphragms and stops' may be fabricated from natural or synthetic rubbers, or other suitable pliant and resilient materials, including a great many polymers, while stops and housings may be made of plastics such as PVC or APP, metals, or any of a wide variety of other materials.
With regard to systems and components above referred to, but not otherwise specified or described in detail herein, the workings and specifications of such systems and components and the manner in which they may be made or asseinbled or used, both cooperatively with each other and with the otller elements of the invention described herein to effect the purposes herein disclosed, are all believed to be well within the knowledge of those skilled in the art. No concerted attempt to repeat here what is generally known to the artisan has therefore been made.
INDUSTRIAL APPLICABILITY
The invention has applicability in the field of plumbing and liquid control or removal. In particular, the invention represents improvements in drain systems for floors and otlier surfaces in which infrequent drainage must be reliably and efficiently processed.
In compliance with the statute, the invention has been described in language more or less specific as to structural features. It is to be understood, however, that the invention is not limited to the specific features shown, since the means and construction shown comprise preferred forms of putting the invention into effect. The invention is, therefore, claimed in any of its forms or modifications within the legitimate and valid scope of the appended claims, appropriately interpreted in accordance with the doctrine of equivalents.
Claims (27)
PROPERTY OR PRIVIELGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A check valve floor drain assembly for draining liquid from a draining surface into a drain conduit, the floor drain assembly comprising:
a drain basin having a drain inlet for liquid draining from the draining surface and an outlet for attachment to the drain conduit; and a check valve disposed within said drain basin, said check valve adapted to permit substantially unrestricted flow of liquid from the drain inlet to the drain conduit, and to prevent backflow of gasses located within said drain conduit to said drain inlet;
the check valve being constructed entirely from a substantially flexible elastomeric material with memory properties that allow said check valve to open for fluid passage and then return to its original shape; whereby the check valve allows liquid to drain from the draining surface and achieves a seal to prevent backflow of gases from the drain conduit after liquid has drained.
a drain basin having a drain inlet for liquid draining from the draining surface and an outlet for attachment to the drain conduit; and a check valve disposed within said drain basin, said check valve adapted to permit substantially unrestricted flow of liquid from the drain inlet to the drain conduit, and to prevent backflow of gasses located within said drain conduit to said drain inlet;
the check valve being constructed entirely from a substantially flexible elastomeric material with memory properties that allow said check valve to open for fluid passage and then return to its original shape; whereby the check valve allows liquid to drain from the draining surface and achieves a seal to prevent backflow of gases from the drain conduit after liquid has drained.
2. A valve assembly for use in substantially vertically draining drain surfaces, the valve assembly comprising:
a support structure adapted for disposition within a drain basin, said support structure adapted to support a plurality of check valves; and at least two of said check valves removably or interchangeably disposed within said support structure and placed in series so as to form between a first valve and a second valve a chamber, said check valves adapted to permit drainage of a liquid from said drain inlet and from said chamber, and to prevent backflow of gasses located within said drain conduit and said chamber to said inlet, whereby a redundant seal is achieved to prevent backflow of gases in the event one of the serial valves fails to close.
a support structure adapted for disposition within a drain basin, said support structure adapted to support a plurality of check valves; and at least two of said check valves removably or interchangeably disposed within said support structure and placed in series so as to form between a first valve and a second valve a chamber, said check valves adapted to permit drainage of a liquid from said drain inlet and from said chamber, and to prevent backflow of gasses located within said drain conduit and said chamber to said inlet, whereby a redundant seal is achieved to prevent backflow of gases in the event one of the serial valves fails to close.
3. The assembly of claim 2, wherein at least one of said check valves comprises a flapper valve.
4. The assembly of claim 2, wherein at least one of said check valves comprises a spring-biased valve.
5. A drain assembly for use in substantially vertical drainage of drain surfaces, the assembly comprising:
a drain basin having an inlet and an outlet, said outlet adapted for attachment of a drain conduit; and a plurality of check valves disposed within said drain basin, said plurality of check valves comprising at least one check valve placed in series with a second check valve so as to form a chamber between said first valve and said second valve, said check valves adapted to permit drainage of a liquid from said drain inlet and from said chamber, and to prevent backflow of gasses located within said drain conduit and said chamber to said inlet, whereby a redundant seal is achieved to prevent backflow of gases in the event one of the serial valves fails to close.
a drain basin having an inlet and an outlet, said outlet adapted for attachment of a drain conduit; and a plurality of check valves disposed within said drain basin, said plurality of check valves comprising at least one check valve placed in series with a second check valve so as to form a chamber between said first valve and said second valve, said check valves adapted to permit drainage of a liquid from said drain inlet and from said chamber, and to prevent backflow of gasses located within said drain conduit and said chamber to said inlet, whereby a redundant seal is achieved to prevent backflow of gases in the event one of the serial valves fails to close.
6. The assembly of claim 5, wherein said check valves are supported in a removable structure.
7. The assembly of claim 5, comprising at least two pairs of parallel said first and second check valves in series.
8. The assembly of claim 5, wherein at least one of said check valves comprise a flapper valve.
9. The assembly of claim 5, wherein at least one of said check valves comprise a spring-biased valve.
10. The assembly of claim 5, further comprising a second set of at least two check valves in parallel with said first set.
11. A check valve for a floor drain, the check valve adapted for disposition within a floor drain and comprising:
a drain sealing surface located proximate to an inlet to said floor drain;
a stop adapted for sealing engagement of said drain sealing surface, said stop further adapted to provide substantial flow of liquid in the open position around the periphery of said stop; and a means adapted to urge said stop into sealing engagement with said drain sealing surface, said means adapted to permit disengagement of the stop from the sealing surface as liquid enters said drain, whereby free flowing drainage of liquid is permitted through said floor drain, and backflow of gasses from said floor drain is prevented after liquid has drained.
a drain sealing surface located proximate to an inlet to said floor drain;
a stop adapted for sealing engagement of said drain sealing surface, said stop further adapted to provide substantial flow of liquid in the open position around the periphery of said stop; and a means adapted to urge said stop into sealing engagement with said drain sealing surface, said means adapted to permit disengagement of the stop from the sealing surface as liquid enters said drain, whereby free flowing drainage of liquid is permitted through said floor drain, and backflow of gasses from said floor drain is prevented after liquid has drained.
12. The check valve of Claim 11, wherein said stop is an elastic diaphragm having sufficient flexibility to flex into a open position under action of said liquid and to allow drainage of said liquid, and to return to a substantially unflexed condition in which sealing engagement of said drain sealing surface by said diaphragm is restored following drainage of said liquid.
13. The check valve of Claim 12, wherein said elastic diaphragm is adapted to flex under the action of a preselected liquid head pressure within said drain.
14. The check valve of Claim 13, wherein said diaphragm comprises a substantially uniform thickness.
15. The check valve of Claim 12, wherein said diaphragm comprises a substantially uniform thickness.
16. The check valve of Claim 12, further comprising a back plate adapted to support at least a portion of said diaphragm.
17. The check valve of Claim 11, wherein said check valve is a spring-biased valve and said means adapted to urge said stop into sealing engagement comprises a spring adapted to urge said stop into sealing engagement with said drain sealing surface.
18. The check valve of Claim 17, wherein said spring has a stiffness adapted to permit disengagement of said stop from said sealing surface when a selected liquid head pressure had been reached inside said drain.
19. The check valve of Claim 11, said valve comprising a housing to support said stop and said means for urging said stop into sealing contact with said drain sealing surface, said housing adapted for removable or interchangeable disposition of said check valve within said drain.
20. The check valve of Claim 11, wherein said valve is adapted for sealing engagement of a substantially circular drain.
21. The check valve of Claim 11, wherein said valve is adapted for sealing engagement of a rectangular drain.
22. The check valve of Claim 11, connected in series with any other valve.
23. A side port floor drain apparatus for admitting liquid from a draining surface into a drain conduit and for preventing discharge of waste gas from the drain conduit into the atmosphere in response to a higher pressure in the drain conduit than at the draining surface, the floor drain apparatus comprising:
a housing having circumferential walls with an exterior surface and an interior surface, an open bore extending throughout, a first section, a second inwardly tapered midsection, a third section designed for connection with the drain conduit, and a cover joined over the first section, forming a chamber adapted for connection with the drain conduit;
a drain port through the walls of the housing having a non-horizontal drain sealing surface on the interior surface, the drain port creating a path for liquid from the exterior surface into the drain conduit; and a stop disposed on the interior surface, located between the non-horizontal drain sealing surface and the drain conduit, configured to sealingly engage the drain sealing surface and movably operate within the chamber, and further configured to admit liquid proximate to the exterior surface into the chamber and into the drain conduit and to prevent discharge of waste gas from the drain conduit into the atmosphere in response to a higher pressure in the drain conduit than at the draining surface.
a housing having circumferential walls with an exterior surface and an interior surface, an open bore extending throughout, a first section, a second inwardly tapered midsection, a third section designed for connection with the drain conduit, and a cover joined over the first section, forming a chamber adapted for connection with the drain conduit;
a drain port through the walls of the housing having a non-horizontal drain sealing surface on the interior surface, the drain port creating a path for liquid from the exterior surface into the drain conduit; and a stop disposed on the interior surface, located between the non-horizontal drain sealing surface and the drain conduit, configured to sealingly engage the drain sealing surface and movably operate within the chamber, and further configured to admit liquid proximate to the exterior surface into the chamber and into the drain conduit and to prevent discharge of waste gas from the drain conduit into the atmosphere in response to a higher pressure in the drain conduit than at the draining surface.
24. The floor drain of Claim 23 wherein said stop comprises an elastic valve having sufficient flexibility to flex under action of liquid being drained and to allow drainage of said liquid, and to return to a substantially unflexed condition in which sealing engagement of said drain sealing surface by said elastic valve is restored following drainage of said liquid;
25. The floor drain of Claim 24 wherein said elastic valve is adapted to flex under the action of a preselected head pressure within said drain.
26. The floor drain of Claim 24 wherein said elastic valve comprises a substantially uniform thickness.
27. The floor drain of Claim 24 said valve comprising a housing to support said stop and said means for urging said stop into sealing contact with said drain sealing surface, said housing adapted for removable or interchangeable disposition of said floor drain within an inlet to a drain conduit.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2001/019651 WO2002103233A1 (en) | 2001-06-19 | 2001-06-19 | Check valve floor drain |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2450304A1 CA2450304A1 (en) | 2002-12-27 |
| CA2450304C true CA2450304C (en) | 2008-01-08 |
Family
ID=21742659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002450304A Expired - Fee Related CA2450304C (en) | 2001-06-19 | 2001-06-19 | Check valve floor drain |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1397607A4 (en) |
| JP (1) | JP2004536981A (en) |
| CN (1) | CN1520497A (en) |
| CA (1) | CA2450304C (en) |
| MX (1) | MXPA03011845A (en) |
| WO (1) | WO2002103233A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4952222B2 (en) * | 2006-12-05 | 2012-06-13 | トヨタ自動車株式会社 | Vehicle equipped with fuel cell |
| EP2088252A3 (en) * | 2007-05-17 | 2013-12-18 | Personnel Hygiene Services Limited | Odour seal for an urinal |
| GB0725126D0 (en) * | 2007-12-22 | 2008-01-30 | Mcalpine & Co Ltd | Improved plumbing sealing arrangement |
| AU2008243269B1 (en) | 2008-11-18 | 2009-04-23 | Larkin & Shoushani Solutions Pty Ltd | Plumbing Fitting |
| CN105178408B (en) * | 2009-05-05 | 2018-04-24 | 李奎德布瑞科尔公司 | Drainage filter core with detachable valve system |
| CN102459972B (en) * | 2009-05-05 | 2015-09-23 | 李奎德布瑞科尔公司 | There is the discharge channel filter core of detachable valve system |
| JP2010261891A (en) * | 2009-05-11 | 2010-11-18 | Hitachi-Ge Nuclear Energy Ltd | Floor drainage funnel |
| CH702893A2 (en) * | 2010-03-30 | 2011-09-30 | Enswico Ip Ag | Valve for installation in a sanitary apparatus. |
| ITTO20120797A1 (en) * | 2012-09-14 | 2012-12-14 | Ferplast S R L | WASTE FLUID DISCHARGE DEVICE. |
| CN105839770B (en) * | 2016-05-27 | 2017-10-31 | 宁波市鄞州安琪阀门有限公司 | Odour-proof floor drain |
| GB2552659B (en) | 2016-08-01 | 2019-06-12 | Mcalpine & Co Ltd | High flow drain control |
| US10415227B2 (en) | 2017-05-26 | 2019-09-17 | Ips Corporation | Drain valve assembly |
| FR3074057B1 (en) * | 2017-11-30 | 2023-03-31 | Piscines Desjoyaux Sa | SUBMERGED FILTRATION DEVICE FOR SWIMMING POOLS |
| IT201800007257A1 (en) * | 2018-07-17 | 2018-10-17 | Water dispensing device for a washing appliance. |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2675823A (en) * | 1949-09-07 | 1954-04-20 | Jesse D Langdon | Backflow preventer |
| US2882923A (en) * | 1955-06-28 | 1959-04-21 | Smolensky Michael | Backwater check means for drainage systems |
| GB1229918A (en) * | 1967-11-14 | 1971-04-28 | ||
| US4232704A (en) * | 1978-03-28 | 1980-11-11 | Amtrol Inc. | In line back flow preventer |
| US4180875A (en) * | 1978-05-16 | 1980-01-01 | Wilson Porter C | Urine disposal bypass unit |
| US4594739A (en) * | 1984-05-21 | 1986-06-17 | Watts Brian R | Protective drain |
| FR2637040A1 (en) * | 1988-09-28 | 1990-03-30 | Mathis Jean | Automatic anti-flood/pollution shutter |
| US5584315A (en) * | 1995-12-18 | 1996-12-17 | Ames Company, Inc. | Check valve assembly and method for mounting and installing check valves within a housing |
-
2001
- 2001-06-19 WO PCT/US2001/019651 patent/WO2002103233A1/en active Application Filing
- 2001-06-19 EP EP01946567A patent/EP1397607A4/en not_active Withdrawn
- 2001-06-19 MX MXPA03011845A patent/MXPA03011845A/en not_active Application Discontinuation
- 2001-06-19 CA CA002450304A patent/CA2450304C/en not_active Expired - Fee Related
- 2001-06-19 CN CNA018233872A patent/CN1520497A/en active Pending
- 2001-06-19 JP JP2003505513A patent/JP2004536981A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP1397607A4 (en) | 2007-10-10 |
| WO2002103233A1 (en) | 2002-12-27 |
| JP2004536981A (en) | 2004-12-09 |
| MXPA03011845A (en) | 2005-03-07 |
| CN1520497A (en) | 2004-08-11 |
| CA2450304A1 (en) | 2002-12-27 |
| EP1397607A1 (en) | 2004-03-17 |
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Legal Events
| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKLA | Lapsed |