CA1198964A - Sewer restriction plate - Google Patents
Sewer restriction plateInfo
- Publication number
- CA1198964A CA1198964A CA000474959A CA474959A CA1198964A CA 1198964 A CA1198964 A CA 1198964A CA 000474959 A CA000474959 A CA 000474959A CA 474959 A CA474959 A CA 474959A CA 1198964 A CA1198964 A CA 1198964A
- Authority
- CA
- Canada
- Prior art keywords
- plate
- restrictor
- frame
- catch basin
- guide
- 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
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
- E03F5/105—Accessories, e.g. flow regulators or cleaning devices
- E03F5/106—Passive flow control devices, i.e. not moving during flow regulation
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Sewage (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A flow restrictor for application to outlet pipes of catch basins in a storm sewer system comprises a restrictor plate in vertical sliding engagement with a frame secured around the pipe opening so that the plate may be installed and removed from above and the restrictor device need not have any direct engagement with the pipe itself.
A flow restrictor for application to outlet pipes of catch basins in a storm sewer system comprises a restrictor plate in vertical sliding engagement with a frame secured around the pipe opening so that the plate may be installed and removed from above and the restrictor device need not have any direct engagement with the pipe itself.
Description
This invention relates to flow restrictors for restricting the outElow from catch basins in storm sewer systems.
I,~G~,æo~
Canadian Patent No. ~,lG r ~ 707 discloses such a restrictor in the ~orm of a specially shaped flow restricting orifice which is secured in the entrance to an out~low pipe from a catch basin to restrict the out~low from the latter under storm conditions whilst mln;m; zing the risk of obstruction due to the accumulation of debris in the catch basin.
Whilst the restrictor disclosed in this patent has proved highly effective in terms of performing its intended function, it has been found that its installation and main-tenance presents some problems. The preferred embodiment of restrictor descri.bed in the patent has a tapered tubu-lar body portion which is pressed into the outlet pipe from the catch basin. In order to adapt the restrictor to the outlet pipe, a certain amount of grouting is fre-quently necessary, as well as or instead of the sleeves and O-rin~s mentioned in the patent. This fitting work must be done at the bottom of a catch basin in conditions which may be unpleasant and hazardous if an existing catch basin is being equipped as will usually be the case. If a restrictor must be removed for any of various reasons, sUch as damage, a need to change the restrictor aperture, a need to obtain access to the pipe for pipe cleaning pur-poses,or because of blockage, the same or worse problemsarise. If a blockage has occurred, the catch basin will likely be flooded, and must be pumped out before any work can take place. Care must be taken when inserting or re-inserting a restrictor that the restrictor orifice is correctly oriented, which again entails working from the bottom of the catch pit.
Yet a further problem arises be~ause the outlet pipes from the catch basin fre~uently have a bend immediatel~ bey s,....~
~8~
the opening from the basin, and will not accept the tapered plug disclosed in the patent.
According to the invention, a flow restrictor for applica-tion to an outlet pipe from a catch basin in a storm sewer system comprises a frame constructed ~o be secured against a vertically extending wall of a catch basin surrounding A the ~ ~ aC~ to the outlet pipe, said frame presenting a supporting surface lying in a common plane and facing awa~
from said wall, a planar restrictor plate de~ining a restrictor orifice and having an operative position in which one surface of the plate contacts said supporting surface in a zone surrounding said restrictor orifice and said outlet pipe entrance, and guide and support means or said plate extending outwardly from said ~rame, said guide and support means defining slots, in which lateral edges of the plate are inserted to guide the latter for downward movement into its operative position, and stop means for preventing downward movement o the plate past said opera~
tive position, whereby the plate may be lowered into and withdrawn from engagement with the ~rame from above.
With such an arrangement, and once the frame has been attached to the catch pit wall, the restrictor plate can be installed and removed from above, without requiring entry to the catch basin. When the restrictor is opera-tive to restrict flow from the catch basin, the build upo~ water in the catch basin will press the plate securely against the frame and frame against the catch pit wall.
The restrictor opening in the plate provides a means by which a tool or grapple can be engaged with the plate to raise and lower it.
In order to facilitate still further the insertion and removal of the plate, the slots defined by the guide means preferably terminate well short of the top Q~ the plate when in its operative position, thus reducing the distance ~8~
through which the latter must be lifted to disengage it from the guide means.
We have also found that the performance of the flow res-trictor can be improved by chamfering the edges of the restrictor orifice on that side of the restrictor plate facing away from the catch basin. ~urprisingl~, although the chamfering renders the orifice walls divergent, it appears to assist in promoting a convergent flow pattern.
Further features of the invention will be apparent from the following description of a preferred embodiment there-of with reference to the accompanying drawings in which:
Figure 1 is a front elevation o a flow restrictor in accordance with the invention; and Figure 2 is a horizontal section on the line 2-2 in Figure 1.
Referring to the drawings, a flow restrictor comprises two main portions, a plate 2 and a ~rame 4. The frame comprises an outer frame fabricated from L-section members 6, 8 and 10, the outwardly extending legs of which form flanges by which the frame is secured to a vertically extending wall W of a catch basin by means of fasteners 12 such as bolts suitably anchored in the wall W. In order to seal the frame to the wall W, the frame may be grouted; in this case it may be advantageous to adhere a dressing of sand to the external surfaces of the frame.
An inner frame is formed by L-section members l~ , 18 and 20 secured within the outer frame, inwardly extending flanges of the members providing a supporting surface for the plate 2, lying in a common plane and facing away from the wall W. Further flanges 24 extending from the flanges of the members 6 and 8, outwardly of the support-ing face, define slots 26 in which the lateral edges of ~L9~
the plate 2 are inserted to guide it for downward movement into an operative position in which it is stopped by sup-port means formed by the outwardly extending flange of member 10. The slots 26 defined by the flanges 24 end well short of the top of the frame Eor reasons discussed further below.
The plate 2 is formed with an approximately central restrictor opening 30 calibrated to provide a desired degree of restriction. The shaping of this orifice is discussed in Canadian Patent No. 1,165,207 and forms per se no part of the present invention. It may be observed however that the shaping is designed to provide desirable flow control characteristics whilst also resi~ting clogg-ing by foreign matter and limiting build up of sediment in the catch basin. We have found that the performance of the plate can be enhanced by orming chamfers 28 on the edges of the orifice on the side of the plate facing away from the catch basin. These chamfers are formed both on the sides at thè main diamond shaped portion of the oriice, and on the rectangular slot 34 extending down-wardly from the bottom apex of the diamond shape. Surpris-ingly, the presence of these chamfers appear to improve the flow through the orifice inducing a desirable conver-gent flow pattern, even though the passage through the plate is divergent.
Both the plate 2 and the frame 4 may be fabricated from type 1 polyvinyl chloride, 1120 compound.
In use, and assuming that the frame 4 has already been secured to the vertically extending wall of the catch basin so as to surround an opening 32 to an outlet pipe from the catch basin, the plate 2 may be installed by introducing the lower ends of the side edges of the plate
I,~G~,æo~
Canadian Patent No. ~,lG r ~ 707 discloses such a restrictor in the ~orm of a specially shaped flow restricting orifice which is secured in the entrance to an out~low pipe from a catch basin to restrict the out~low from the latter under storm conditions whilst mln;m; zing the risk of obstruction due to the accumulation of debris in the catch basin.
Whilst the restrictor disclosed in this patent has proved highly effective in terms of performing its intended function, it has been found that its installation and main-tenance presents some problems. The preferred embodiment of restrictor descri.bed in the patent has a tapered tubu-lar body portion which is pressed into the outlet pipe from the catch basin. In order to adapt the restrictor to the outlet pipe, a certain amount of grouting is fre-quently necessary, as well as or instead of the sleeves and O-rin~s mentioned in the patent. This fitting work must be done at the bottom of a catch basin in conditions which may be unpleasant and hazardous if an existing catch basin is being equipped as will usually be the case. If a restrictor must be removed for any of various reasons, sUch as damage, a need to change the restrictor aperture, a need to obtain access to the pipe for pipe cleaning pur-poses,or because of blockage, the same or worse problemsarise. If a blockage has occurred, the catch basin will likely be flooded, and must be pumped out before any work can take place. Care must be taken when inserting or re-inserting a restrictor that the restrictor orifice is correctly oriented, which again entails working from the bottom of the catch pit.
Yet a further problem arises be~ause the outlet pipes from the catch basin fre~uently have a bend immediatel~ bey s,....~
~8~
the opening from the basin, and will not accept the tapered plug disclosed in the patent.
According to the invention, a flow restrictor for applica-tion to an outlet pipe from a catch basin in a storm sewer system comprises a frame constructed ~o be secured against a vertically extending wall of a catch basin surrounding A the ~ ~ aC~ to the outlet pipe, said frame presenting a supporting surface lying in a common plane and facing awa~
from said wall, a planar restrictor plate de~ining a restrictor orifice and having an operative position in which one surface of the plate contacts said supporting surface in a zone surrounding said restrictor orifice and said outlet pipe entrance, and guide and support means or said plate extending outwardly from said ~rame, said guide and support means defining slots, in which lateral edges of the plate are inserted to guide the latter for downward movement into its operative position, and stop means for preventing downward movement o the plate past said opera~
tive position, whereby the plate may be lowered into and withdrawn from engagement with the ~rame from above.
With such an arrangement, and once the frame has been attached to the catch pit wall, the restrictor plate can be installed and removed from above, without requiring entry to the catch basin. When the restrictor is opera-tive to restrict flow from the catch basin, the build upo~ water in the catch basin will press the plate securely against the frame and frame against the catch pit wall.
The restrictor opening in the plate provides a means by which a tool or grapple can be engaged with the plate to raise and lower it.
In order to facilitate still further the insertion and removal of the plate, the slots defined by the guide means preferably terminate well short of the top Q~ the plate when in its operative position, thus reducing the distance ~8~
through which the latter must be lifted to disengage it from the guide means.
We have also found that the performance of the flow res-trictor can be improved by chamfering the edges of the restrictor orifice on that side of the restrictor plate facing away from the catch basin. ~urprisingl~, although the chamfering renders the orifice walls divergent, it appears to assist in promoting a convergent flow pattern.
Further features of the invention will be apparent from the following description of a preferred embodiment there-of with reference to the accompanying drawings in which:
Figure 1 is a front elevation o a flow restrictor in accordance with the invention; and Figure 2 is a horizontal section on the line 2-2 in Figure 1.
Referring to the drawings, a flow restrictor comprises two main portions, a plate 2 and a ~rame 4. The frame comprises an outer frame fabricated from L-section members 6, 8 and 10, the outwardly extending legs of which form flanges by which the frame is secured to a vertically extending wall W of a catch basin by means of fasteners 12 such as bolts suitably anchored in the wall W. In order to seal the frame to the wall W, the frame may be grouted; in this case it may be advantageous to adhere a dressing of sand to the external surfaces of the frame.
An inner frame is formed by L-section members l~ , 18 and 20 secured within the outer frame, inwardly extending flanges of the members providing a supporting surface for the plate 2, lying in a common plane and facing away from the wall W. Further flanges 24 extending from the flanges of the members 6 and 8, outwardly of the support-ing face, define slots 26 in which the lateral edges of ~L9~
the plate 2 are inserted to guide it for downward movement into an operative position in which it is stopped by sup-port means formed by the outwardly extending flange of member 10. The slots 26 defined by the flanges 24 end well short of the top of the frame Eor reasons discussed further below.
The plate 2 is formed with an approximately central restrictor opening 30 calibrated to provide a desired degree of restriction. The shaping of this orifice is discussed in Canadian Patent No. 1,165,207 and forms per se no part of the present invention. It may be observed however that the shaping is designed to provide desirable flow control characteristics whilst also resi~ting clogg-ing by foreign matter and limiting build up of sediment in the catch basin. We have found that the performance of the plate can be enhanced by orming chamfers 28 on the edges of the orifice on the side of the plate facing away from the catch basin. These chamfers are formed both on the sides at thè main diamond shaped portion of the oriice, and on the rectangular slot 34 extending down-wardly from the bottom apex of the diamond shape. Surpris-ingly, the presence of these chamfers appear to improve the flow through the orifice inducing a desirable conver-gent flow pattern, even though the passage through the plate is divergent.
Both the plate 2 and the frame 4 may be fabricated from type 1 polyvinyl chloride, 1120 compound.
In use, and assuming that the frame 4 has already been secured to the vertically extending wall of the catch basin so as to surround an opening 32 to an outlet pipe from the catch basin, the plate 2 may be installed by introducing the lower ends of the side edges of the plate
2 into the slots 26. The upper portions of the members 6 and 8 provide useful guides to aid such insertion. The plate may then be inserted until its lower edge meets the stop provided by the member 10, thus positioning the ori-fice 30 in front of the opening 32. ~len the catch basin fills with an accumulation of storm water, hydrostatic pressure will tend to press the plate against the support surface formed by the flan~es 22, and the frame 4 in turn will be pressed against the catch basin ~all W. Insertion of the plate may readily be ~arried out from above, with-out entering the catch basin.
If it is desired for any reason to remove the plate, a suitable grapple may be lowered into the catch pit, even if flooded, and engaged with the opening 32, and the plate pulled upwardly until its side edges disengage from the slots 26. By making the slots end well short of the top of the frame, engagement and disenga~ement of the plate is facilitated. In the event that the opening 32 has foreign matter such as sticks jammed in it, the shortened slots permit the plate to be pulled orwardly awa~ from the frame before the whole of the opening has moved foul of the frame, thus reducing the risk of jamming. Since no part of the structure need extend into the pipe open ing, the configuration of the latter is immaterial.
Whilst the foregoing description and the appended claims refer or clarity to the restrictor plate as being planar, it should be understood that moderate curvature of the plate in one dimension would be possible provided that co-acting parts were also similar~y curved to permit proper cooperation of the parts as described above.
If it is desired for any reason to remove the plate, a suitable grapple may be lowered into the catch pit, even if flooded, and engaged with the opening 32, and the plate pulled upwardly until its side edges disengage from the slots 26. By making the slots end well short of the top of the frame, engagement and disenga~ement of the plate is facilitated. In the event that the opening 32 has foreign matter such as sticks jammed in it, the shortened slots permit the plate to be pulled orwardly awa~ from the frame before the whole of the opening has moved foul of the frame, thus reducing the risk of jamming. Since no part of the structure need extend into the pipe open ing, the configuration of the latter is immaterial.
Whilst the foregoing description and the appended claims refer or clarity to the restrictor plate as being planar, it should be understood that moderate curvature of the plate in one dimension would be possible provided that co-acting parts were also similar~y curved to permit proper cooperation of the parts as described above.
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A flow restrictor for application to an outlet pipe from a catch basin in a storm sewer system comprising a frame constructed to be secured against a vertically ex-tending wall of a catch basin surrounding the entrance to the outlet pipe, said frame presenting a supporting surface lying in a common plane and facing away from said wall, a planar restrictor plate defining a restrictor orifice and having an operative position in which one surface of the plate contacts said supporting surface in a zone surround-ing said restrictor orifice and said outlet pipe entrance, and guide and support means for said plate extending out-wardly from said frame, said guide and support means defin-ing slots, in which lateral edges of the plate are inserted to guide the latter for downward movement into its opera-tive position, and stop means for preventing downward movement of the plate past said operative position, whereby the plate may be lowered into and withdrawn from engagement with the frame from above.
2. A flow restrictor according to Claim 1, wherein the slots formed by the guide means terminate well short of the top of the plate when in its operative position.
3. A flow restrictor according to Claim 1, wherein the external surfaces of the frame have a dressing of sand adhered thereto, whereby to improve their adhesion to cement.
4. A flow restrictor according to Claim 1, 2 or 3, wherein the edges of the plate defining the restrictor orifice are chamfered on that side of the plate facing away from the catch basin.
5. A flow restrictor according to Claim 1, 2 or 3, wherein the restrictor orifice is of diamond shape, with a bottom apex extended downwardly to form a rectangular slot, and the edges of the diamond shape and the slot are chamfered on that side of the place facing away from the catch basin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000474959A CA1198964A (en) | 1985-02-22 | 1985-02-22 | Sewer restriction plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000474959A CA1198964A (en) | 1985-02-22 | 1985-02-22 | Sewer restriction plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1198964A true CA1198964A (en) | 1986-01-07 |
Family
ID=4129885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000474959A Expired CA1198964A (en) | 1985-02-22 | 1985-02-22 | Sewer restriction plate |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1198964A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1036953C2 (en) * | 2009-04-17 | 2010-10-19 | Wavin Bv | Mounting assembly with supporting bracket for mounting a water treatment unit in a water reservoir. |
| NL1036869C2 (en) * | 2009-04-17 | 2010-10-19 | Wavin Bv | Mounting assembly with a mounting tool for mounting a water treatment unit in a water reservoir. |
| EP2241689A1 (en) * | 2009-04-17 | 2010-10-20 | Wavin B.V. | Mounting assembly with supporting bracket for mounting a water treatment unit in a water reservoir |
-
1985
- 1985-02-22 CA CA000474959A patent/CA1198964A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1036953C2 (en) * | 2009-04-17 | 2010-10-19 | Wavin Bv | Mounting assembly with supporting bracket for mounting a water treatment unit in a water reservoir. |
| NL1036869C2 (en) * | 2009-04-17 | 2010-10-19 | Wavin Bv | Mounting assembly with a mounting tool for mounting a water treatment unit in a water reservoir. |
| EP2241689A1 (en) * | 2009-04-17 | 2010-10-20 | Wavin B.V. | Mounting assembly with supporting bracket for mounting a water treatment unit in a water reservoir |
| EP2241688A1 (en) * | 2009-04-17 | 2010-10-20 | Wavin B.V. | Mounting assembly with a mounting tool for mounting a water treatment unit in a water reservoir |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |