This invention relates to a backflow prevention system and in particular to a one-way valve that utilizes flexible rubber flaps to prevent fluid flow in an undesired direction.
Sewer systems containing pipes provide a way to remove dirty water and waste from residential dwellings and businesses. During rain storms and other times of high liquid volumes or when obstructions are introduced, the sewer systems can become backed up, and the waste water flows back through the pipes into homes and businesses causing serious and costly damage. Each year in the United States sewers back up in basements several hundred thousand times from the more than 50,000 municipal sanitary systems that overflow. Harmful pathogens are released and conditions are created where black mold can grow. Often the backflow problems arise when raw sewage and storm drainage use the same pipeline. During heavy rainfall, system may become overloaded causing waste water to flow back into homes and businesses. An aging pipeline system in the United States increases the chance of a poor removal of waste water and an increase in flooding. Solids and other items put into the drains may also stop the flow and cause a backup.
The current technologies that address these backflow issues have inherent deficiencies that reduce their effectiveness. These deficiencies are associated with systems that are a) not leak-proof, b) difficult to install, c) costly, d) difficult to clean, e) not strong enough to withstand heavy pressure, and f) do not communicate the occurrence of a clogged pipe or backflow situation.
Inventions that attempt to address backflow issues include duckbill type valve designs that use a shaped rubber member that closes on itself. It is anticipated this valve would be difficult to clean, and because the bottom of the valve is not mounted to the pipe a cleaning snake would snag on the valve and possibly damage it. Without attaching the bottom lip to the pipe, it is possible that the valve would turn inside out under high pressure. In one example, the valve closes because of difference in thickness of the lips in the valve. This type of valve has lips which fold to close. The folded rubber may result in a seal that is not completely leak proof at all pressures.
There is a need for a low cost backflow valve that is easy to install, easy to clean, has a leak-proof seal, requires no power, and can be installed either inside or outside of a building. The public would benefit from a reliable system that protects their homes and businesses from backflow containing harmful liquids, gases and destructive material.
The disclosed invention is a backflow prevention system consisting of a valve housing, a rubber one-way valve, and an alarm. Applications for the device include, but are not limited to, sewer systems, storm drains, pipelines, and liquid transfer systems. When sewer and other fluid systems experience heavy flow or obstructions, the fluid can be backed up, creating strong reverse pressure to residential and business plumbing systems, resulting in flooding buildings.
The system comprises two rubber flaps attached in such a way that fluid is allowed to flow through a channel between the two flaps in only one direction. The pressure of the fluid on the flaps during a backflow causes the channel to seal itself against the fluid flow. The system also employs a warning alarm to alert the user of a backflow problem. The two flaps, which lie in the valve housing, are attached to each other on the sides. The flaps may be two individual pieces of rubber or may be a single piece of rubber. The flaps are attached to an inlet pipe coming from the building in a way to keep the flaps in an open position to allow water to flow through the valve. The open position allows fluid to flow through the valve if the fluid is flowing away from the building. The edges of the flaps that run parallel with the pipes are attached to each other. At least one anchor is used to attach the flaps to the valve housing or another internal structural component in the corners of the flaps at the exit of the valve. The two flaps lie on the bottom of the valve housing, with one flap on top of the other, both flaps following the curvature of the valve housing. The flaps lie on top of one another in such a way to make a seal when fluid flows back toward the outlet pipe of the building instead of flowing away from it. The bottom flap may be attached to the bottom of the inside of the valve housing so as to prevent the bottom flap from moving and preventing the valve from folding in on itself. The sides of the flaps are sealed together to prevent the flow of fluid in or out of the channel on the sides. An alarm sensor is mounted within the valve housing but outside the one-way rubber valve. When fluid begins to flow back toward the one-way valve and inlet pipe, the fluid accumulates outside the channel, because it cannot flow back through the valve. As the fluid level rises in the valve housing, it is detected by the sensor which communicates with an alarm to notify the user of a backflow issue. This provides an early warning notification of a backflow problem. This one-way valve creates a leak-proof seal. The valve is easily cleaned and no power is needed. It provides a reliable, low-cost solution to an increasing problem. When cleaning is needed the valve can be cleaned without folding inside out. It also provides an early warning notification for users.
Understanding that drawings depict only certain preferred embodiments of the invention and are therefore not to be considered limiting of its scope, the preferred embodiments will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:
In the following description, numerous specific details are provided for a thorough understanding of specific preferred embodiments. However, those skilled in the art will recognize that embodiments can be practiced without one or more of the specific details, or with other methods, components, materials, etc. In some cases, well-known structures, materials, or operations are not shown or described in detail in order to avoid obscuring aspects of the preferred embodiments. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in a variety of alternative embodiments. Thus, the following more detailed description of the embodiments of the present invention, as represented in the drawings, is not intended to limit the scope of the invention, but is merely representative of the various embodiments of the invention.
Backflow of waste water has caused serious damage for home and business owners when their basements flood. There is a need for a simple to install, low-cost, reliable, and easily cleaned one way valve that prevents the backflow of fluid waste. The disclosed rubber one-way valve utilizes a reliable and easy to install apparatus that provides a simple solution to an increasing problem. While the actual valve does not require electrical power, the sensor does need a power source.
The backflow prevention system 11 shown in a cut away view in
Within the valve housing 12 is a one-way rubber valve that consists of a top flap 13 and a bottom flap 14 which are shown in
The upstream ends of the flaps 13, 14 are sealed to the downstream circumference of the pipe section 15. Referring to
The bottom flap 14 may be attached to the inside bottom surface of the valve housing 12 using a variety of fastening means including but not limited to adhesives, anchors, rivets, screws, bolts, and the like. This is one technique to maintain the basic shape of the flaps under backflow conditions. The top flap 13 is stacked or positioned over the bottom flap 14 as shown in
In another embodiment, shown in
A water sensor 16 is positioned within the backflow prevention system 11 to provide notification when a backflow is present. The water sensor 16 may be located within the housing 12 at a position above the normal water flow as shown in
A backflow event generally occurs when there is a large amount of waste fluid in the public sewer system or the public sewer system is plugged thus reducing the amount of water the system can accommodate and inhibiting the flow of water into the sewer system.
Under normal operating conditions, i.e. in the absence of backflow, liquid being discharged from the building 22 flows through the backflow prevention system 11 from the inlet pipe 17 through the cylindrical pipe section 15, and passes between the top flap 13 and the bottom flap 14 within the housing 12. The flow pressure is sufficient to cause the downstream end of the top flap 13 to rise from the bottom flap 14, as shown in
When a backflow event occurs, water moves in the reverse direction and enters the backflow prevention system 11 through the outlet pipe 18. Because the top flap 13 and the bottom flap 14 are in contact, as shown in
During a backflow event the waste fluid 25 accumulates in the valve housing 12. The rise of the fluid level in the valve housing 12 is detected by one or more water sensors 16 positioned inside the housing 12. The sensor sends a signal to an alarm device that communicates the occurrence of a backflow event. Since the valve housing 12 incorporates a wider area than the inlet pipe 17 and outlet pipe 18, there is additional space for the accumulation of waste fluid before the sensor 16 is activated, thus insuring that the normal flow of liquid through the backflow prevention system 11 does not trigger false alarms.
In another embodiment the water sensor 16 may be located at the top of the cylindrical pipe section 15 upstream from the rubber flaps 13, 14 as shown in
While specific embodiments of the backflow prevention system have been illustrated and described, it is to be understood that the disclosed invention is not limited to the precise configuration, components, and methods disclosed herein. Various modifications, changes, and variations apparent to those of skill in the art may be made in the arrangement, operation, and details of the device and method of the present invention disclosed herein without departing from the spirit, scope, and underlying principles of the disclosure. The described embodiments are to be considered in all respects as illustrative and not restrictive. Therefore, the scope of the invention is indicated by the appended claims, rather than by the foregoing description.
Number | Date | Country | |
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61285123 | Dec 2009 | US |