GB1593262A - Pressure reducing devices - Google Patents
Pressure reducing devices Download PDFInfo
- Publication number
- GB1593262A GB1593262A GB39039/76A GB3903976A GB1593262A GB 1593262 A GB1593262 A GB 1593262A GB 39039/76 A GB39039/76 A GB 39039/76A GB 3903976 A GB3903976 A GB 3903976A GB 1593262 A GB1593262 A GB 1593262A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hollow spigot
- bush
- pressure reducing
- reducing device
- pressure
- 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
- 229920006395 saturated elastomer Polymers 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims description 2
- 238000009987 spinning Methods 0.000 claims description 2
- POIUWJQBRNEFGX-XAMSXPGMSA-N cathelicidin Chemical compound C([C@@H](C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CO)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H]([C@@H](C)CC)C(=O)NCC(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](C(C)C)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC(O)=O)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](C(C)C)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CO)C(O)=O)NC(=O)[C@H](CC=1C=CC=CC=1)NC(=O)[C@H](CC(O)=O)NC(=O)CNC(=O)[C@H](CC(C)C)NC(=O)[C@@H](N)CC(C)C)C1=CC=CC=C1 POIUWJQBRNEFGX-XAMSXPGMSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23126—Diffusers characterised by the shape of the diffuser element
- B01F23/231263—Diffusers characterised by the shape of the diffuser element having dome-, cap- or inversed cone-shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0042—Degasification of liquids modifying the liquid flow
- B01D19/0052—Degasification of liquids modifying the liquid flow in rotating vessels, vessels containing movable parts or in which centrifugal movement is caused
- B01D19/0057—Degasification of liquids modifying the liquid flow in rotating vessels, vessels containing movable parts or in which centrifugal movement is caused the centrifugal movement being caused by a vortex, e.g. using a cyclone, or by a tangential inlet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0036—Flash degasification
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/20—Activated sludge processes using diffusers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Measuring Fluid Pressure (AREA)
Description
(54) IMPROVEMENTS RELATING TO PRESSURE REDUCING DEVICES
(71) We, BABCOCK WATER
TREATMENT LIMITED, a British Company, of "Unifilter House", 25 Raleigh Gardens, London Road, Mitcham, CR4 3UP,
Surrey, England, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to pressure reducing devices and, more particularly, to pressure reducing devices arranged to achieve a sudden pressure reduction in a flow of water or other liquid saturated or substantially saturated with dissolved air or other gas from a pressure of approximately 3.5 atmospheres to atmospheric pressure, in order to urge the dissolved air or other gas out of solution and promote the continuous formation of a cloud of micro bubbles in the flow of water.
According to the present invention there is provided a pressure reducing device arranged to achieve a sudden pressure reduction in a flow of liquid saturated, or substantially saturated, with dissolved gas including a bush adapted to be positioned on the wall of a pressure tube conveying the liquid and dissolved gas, a hollow spigot positioned to extend through the bush into the interior of the pressure tube, substantially perpendicular to the pressure tube longitudinal axis, with a mouth portion within the bush and a closed end remote therefrom and formed with inlet orifices for the flow of the liquid and dissolved gas from the pressure tube inwardly into the hollow spigot having axes in a plane or planes substantially perpendicular to the hollow spigot longitudinal axis and a discharge cap mounted on the bush and positioned to be external of the pressure tube.
The invention will now be described, by way of example, with reference to the accompanying drawing showing a crosssectional elevation of a pressure reducing device mounted on a pressure tube 2 for immersion in a body of water to be aerated.
The pressure tube 2 is formed of plastics material and an inwardly flanged, internally threaded, plastics bush 4 is inserted, and secured by means of an adhesive weld 6, into a corresponding aperture 8 in the cylindrical wall of the pressure tube. A hollow spigot 10 which may be of brass, stainless steel or other material having resistance to corrosion by water, if formed with a lip 12 at the mouth thereof which fits within the bush to bear against an O-ring seal 14 seated on the inwardly directed flange 16. A discharge cap 18 which serves to distribute the water flow is formed with a threaded boss 20 mating with the bush 4 such that the boss, when threaded into the bush, serves to urge the lip 12 of the hollow spigot 10 into engagement with the O-ring seal 14 which in turn bears against the inwardly directed flange 16 on the bush. The boss 20 is formed with an outwardly directed flange 22 which is swaged over a rim 24 provided on a slotted, hemi-spherical, dome 26.
The hollow spigot 10 is, in the portion projecting from the bush into the pressure tube, formed with two, diametrically opposed, co-axial, orifices 28 approximately 1.75 mmto 2.5 mm in diameter.
In operation, a flow of water substantially saturated with air at a pressure of approximately 3.5 atmospheres is supplied to the pressure tube 2 to produce a flow through the hollow spigot 10. The respective streams of saturated water emerging from the diametrically opposed orifices 28 impinge to produce a vortex region in which, by virtue of the shearing effect and the sudden pressure drop arising from the throttling effect of the orifices and the vortex, the saturated air comes out of solution as minute, or micro, bubbles. The stream of water and bubbles then flows through the boss 20 of the discharge cap 18 to the slotted dome 26 and diffuses into the body of water.
In alternative embodiments (not shown), the formation of minute, or micro, bubbles is enhanced by the provision of a further pressure reducing device, such as a ball or a freely spinning insert restrained by a spring within a bore divergent toward the mouth of the hollow spigot, the end portion of the spring remote from the ball or insert being held between the boss and the lip of the hollow spigot, or an orifice plate held in abutment with the lip of the hollow spigot, or an orifice plate held in abutment with the lip on the mouth of the hollow spigot. The restrictive effect of the ball is varied by arranging that the retaining spring is appreciably compressible dependent upon the pressure differential across the ball thereby, by virtue of the tapering bore of the spigot, varying the area of the annulus between the ball and the wall of the hollow spigot.
Other configurations of the inlet orifices may be utilised, such as offset opposition or an abreast arrangement. Furthermore, in addition to positioning the two axes of the orifices in a single plane, the orifices may be positioned such that the axes lie on spaced planes substantially perpendicular to the longitudinal axis of the hollow spigot. Alternatively, the orifices may be positioned such that the axes intersect or are skew.
WHAT WE CLAIM IS:
1. A pressure reducing device arranged to achieve a sudden pressure reduction in a flow of liquid saturated, or substantially saturated, with dissolved gas including a bush adapted to be positioned on the wall of a pressure tube conveying the liquid and dissolved gas, a hollow spigot positioned to extend through the bush into the interior of the pressure tube, substantially perpendicular to the pressure tube longitudinal axis, with a mouth portion within the bush and a closed end remote therefrom and formed with inlet orifices for the flow of the liquid and dissolved gas from the pressure tube inwardly into the hollow spigot having axes in a plane or planes substantially perpendicular to the hollow spigot longitudinal axis and a discharge cap mounted on the bush and positioned to be external of the pressure tube.
2. A pressure reducing device as claimed in Claim 1, wherein two, diametrically opposed, inlet orifices are provided in the hollow spigot.
3. A pressure reducing device as claimed in Claim 2, wherein the axes of the inlet orifices lie in the same diametrical plane.
4. A pressure reducing device as claimed in Claim 3, wherein the inlet orifices are
co-axial.
5. A pressure reducing device as claimed
in any preceding claim, wherein the mouth of
the hollow spigot is formed with an outwardly extending lip co-acting with an inwardly directed flange formed on the bush.
6. A pressure reducing device as claimed in Claim 5, wherein the discharge cap is formed with a boss arranged to be threaded into the bush to urge the lip on the hollow spigot toward the outwardly directed flange on the bush.
7. A pressure reducing device as claimed in Claim 6, wherein a deformable toroidal washer is interposed between the lip on the hollow spigot and the inwardly directed flange on the bush.
8. A pressure reducing device arranged to achieve a sudden pressure reduction in a flow of liquid saturated, or substantially saturated, with dissolved gas formed and adapted to operate substantially as hereinbefore described with reference to the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (8)
1. A pressure reducing device arranged to achieve a sudden pressure reduction in a flow of liquid saturated, or substantially saturated, with dissolved gas including a bush adapted to be positioned on the wall of a pressure tube conveying the liquid and dissolved gas, a hollow spigot positioned to extend through the bush into the interior of the pressure tube, substantially perpendicular to the pressure tube longitudinal axis, with a mouth portion within the bush and a closed end remote therefrom and formed with inlet orifices for the flow of the liquid and dissolved gas from the pressure tube inwardly into the hollow spigot having axes in a plane or planes substantially perpendicular to the hollow spigot longitudinal axis and a discharge cap mounted on the bush and positioned to be external of the pressure tube.
2. A pressure reducing device as claimed in Claim 1, wherein two, diametrically opposed, inlet orifices are provided in the hollow spigot.
3. A pressure reducing device as claimed in Claim 2, wherein the axes of the inlet orifices lie in the same diametrical plane.
4. A pressure reducing device as claimed in Claim 3, wherein the inlet orifices are
co-axial.
5. A pressure reducing device as claimed
in any preceding claim, wherein the mouth of
the hollow spigot is formed with an outwardly extending lip co-acting with an inwardly directed flange formed on the bush.
6. A pressure reducing device as claimed in Claim 5, wherein the discharge cap is formed with a boss arranged to be threaded into the bush to urge the lip on the hollow spigot toward the outwardly directed flange on the bush.
7. A pressure reducing device as claimed in Claim 6, wherein a deformable toroidal washer is interposed between the lip on the hollow spigot and the inwardly directed flange on the bush.
8. A pressure reducing device arranged to achieve a sudden pressure reduction in a flow of liquid saturated, or substantially saturated, with dissolved gas formed and adapted to operate substantially as hereinbefore described with reference to the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB39039/76A GB1593262A (en) | 1977-09-21 | 1977-09-21 | Pressure reducing devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB39039/76A GB1593262A (en) | 1977-09-21 | 1977-09-21 | Pressure reducing devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1593262A true GB1593262A (en) | 1981-07-15 |
Family
ID=10407249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB39039/76A Expired GB1593262A (en) | 1977-09-21 | 1977-09-21 | Pressure reducing devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1593262A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0259938A1 (en) * | 1986-09-11 | 1988-03-16 | Nijhuis Water B.V. | Throttling device, method for using the throttling device and also device for using the method |
| EP0332157A1 (en) * | 1988-03-08 | 1989-09-13 | Walter Roediger | Arrangement for joining a distribution device to a fluid supply conduit |
| EP0546335A1 (en) * | 1991-12-09 | 1993-06-16 | Karl-Heinz SCHÜSSLER | Device for introducing gas in fluids |
-
1977
- 1977-09-21 GB GB39039/76A patent/GB1593262A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0259938A1 (en) * | 1986-09-11 | 1988-03-16 | Nijhuis Water B.V. | Throttling device, method for using the throttling device and also device for using the method |
| US4961857A (en) * | 1986-09-11 | 1990-10-09 | Nijhuis Water B. V. | Throttling device and method for feeding gas dissolved in liquid under high pressure into liquid under low pressure |
| EP0332157A1 (en) * | 1988-03-08 | 1989-09-13 | Walter Roediger | Arrangement for joining a distribution device to a fluid supply conduit |
| EP0546335A1 (en) * | 1991-12-09 | 1993-06-16 | Karl-Heinz SCHÜSSLER | Device for introducing gas in fluids |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19970920 |