GB2239614A - Compressed-air supply system - Google Patents
Compressed-air supply system Download PDFInfo
- Publication number
- GB2239614A GB2239614A GB9000109A GB9000109A GB2239614A GB 2239614 A GB2239614 A GB 2239614A GB 9000109 A GB9000109 A GB 9000109A GB 9000109 A GB9000109 A GB 9000109A GB 2239614 A GB2239614 A GB 2239614A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- pressure
- dryer
- pass valve
- air
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/261—Drying gases or vapours by adsorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0454—Controlling adsorption
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
A compressed-air supply system comprises an air dryer (3), a servo-controlled by-pass valve (7) connected in parallel to the dryer (3) and a pressure switch (9) connected downstream of both the dryer (3) and the by-pass valve (7) to operate the valve (7) such that when the pressure in the switch (9) and hence the system outlet (2) falls beneath a preset pressure the switch (9) operates the valve (7) to allow air to by-pass the dryer (3) and maintain supply pressure at the output. A second dryer unit (11) may be in series with the by-pass valve so that it comes into operation when the by-pass valve is open. A control system of the by-pass valve may comprise a pneumatic shuttle valve (14) to supply air pressure to pneumatically operated by-pass valve (7), the shuttle being pushed to one side by air pressure from a solenoid valve (12) operated by switch (9) and to the other side by manually controlled reset air pressure from valve (16). <IMAGE>
Description
COMPRESSED-AIR SUPPLY SYSTEM
This invention relates to a compressed-air supply system and in particular to a system incorporating a dryer unit to ensure dry air is supplied. Air dryers are susceptible to occasional blockage due to internal freezing and can cause supply pressure loss or on occasions complete loss of air supply.
This may, in constantly used systems, cause expensive failures of equipment and/or tests using the air supply.
An object of the present invention is to provide a system which automatically corrects dryer failure to maintain air supply.
According to the present invention a compressed-air supply system comprises an air dryer, a servocontrolled by-pass valve connected in parallel to the dryer and a pressure switch connected downstream of both the dryer and by-pass valve to operate the by-pass valve such that when the pressure in the pressure switch and hence the system outlet falls beneath a preset pressure the pressure switch operates at the by-pass valve to allow air to by-pass the dryer and maintain supply pressure at the output.
Preferably the by-pass valve is of the latching type.
A second dryer unit may be arranged in series with the by-pass valve so that it comes into operation when the by-pass valve is opened to by-pass the first and main dryer unit.
A second solenoid valve may be provided to cut out the dryer to isolate it when the by-pass valve is latched and/or isolation valves may be provided around the dryer to that it can be separated for servicing without interrupting the air supply.
A manual reset may be provided for the by-pass valve which may have its servo system pneumatically operated. In the latter case the control system for the by-pass valve may comprise a pneumatic shuttle valve to supply air pressure to the pneumatically operated by-pass valve and the shuttle is pushed to one side by air pressure from a solenoid valve operated by the pressure switch and to the other side for resetting by a manually controlled reset air pressure valve.
Further aspects of the present invention will become apparent from the following description, by way of example only of some embodiments of the invention
An air supply pipe 1 is arranged to provide an output air supply 2 via a main dryer unit 3 of conventional construction. Either side of the dryer unit 3 are provided isolation valves 4 and 5 and before the first isolation valve 4 a by-pass pipe 6 leads to a pneumatically controlled by-pass valve 7 which leads by a pipe 8 back to the main air supply pipe. A pressure sensitive valve 9 is provided at a T-junction connected to the main air supply output pipe 2 and a pressure dial gauge BQ is provided to indicate the output pressure.The pressure switch 9 is connected electrically to the by-pass valve 7. An optional second dryer unit IS is connected between the by-pass valve 7 and the pipe 8.
Operation of the device is that normally air through the inlet pipe 1 passes through the dryer unit 3 and out of the output pipe 2. The pressure switch 9 and gauge 10 monitor the pressure in the output pipe 2. In the event of a blockage in the dryer unit 3 the pressure switch 9 senses the loss of pressure and, at a preset pressure, sends an electric signal to the by-pass valve 7 which opens to allow air to pass through the pipes 6 and 8 to the output thus by-passing the dryer unit 3. This allows the dryer unit 3 to be isolated by the valves 4 and 5 and correction made to its system.
The electric output can also be used to operate an alarm.
A second dryer unit 11 may be provided as shown by the broken lines in the Figures and this dryer unit comes into operation when the by-pass valve is open. Restoration of the main dryer unit 3 when it has been cleared can be effected by manual 1 y switching off the by-pass valve 7 to reset the system.
An alternative arrangement is shown in Figure 2 where the same numbers are used for all the common parts and the difference in this unit relates purely to the control system.
Once again a pressure sensitive switch 9 monitors the output pressure and operates the by-pass valve 7 so that air supply is continued through pipes 6 and 8 in the same way as the first embodiment. The control system comprises however a first solenoid valve 12 which when operated by the pressure monitoring switch 9 supplies air pressure to a port 13 of a shuttle valve 14. An air supply is connected from the output pipe 2 to the shuttle valve through a pressure regulator R and this air is also supplied to the solenoid valve 12. Thus when the solenoid valve 12 is operated by means of the pressure switch 9 air is provided to the port 13 of the shuttle valve so as to provide an output pressure at the output port 15 which in turn supplies air pressure to the by-pass valve 7.In this case the by-pass valve t is pneumatically operated and is preferably of the diaphragm type.
Thus when the pressure switch 9 senses a loss of pressure it is able to send the necessary signal by means of a shuttle valve to open the by-pass valve and by-pass the dryer unit 3. A manually controlled reset valve 16 is provided which, when operated to reset the system, sends air pressure to the left-hand input port 17 of the shuttle valve to reset it and switch off the air supply to the bypass valve thus restoring the main air flow through the dryer 3.
Thus the system provides a means of by-passing the dryer unit automatically at any preset pressure below the normal supply pressure and means to isolate the dryer and correct it without interrupting the air supply or indeed, when the pressure valve is set correctly, in any substantial loss of pressure in the output 2.
Claims (8)
1. A compressed-air supply system comprising an air dryer, a servo-controlled by-pass valve connected in parallel to the dryer and a pressure switch connected downstream of both dryer and bypass valve to operate the by-pass valve such that when the pressure in the pressure switch and hence the system outlet falls beneath a preset -pressure the pressure switch operate the by-pass valve to allow air to by-pass the dryer and maintain supply pressure are the output.
2. A system according to claim 1 wherein the bypass valve is of the latching type.
3. A system according to claim 2 wherein a second dryer unit is in series with the by-pass valve so that it comes into operation when the bypass valve is open.
4. A system according to claim 2 or 3 wherein a second solenoid valve cuts out the dryer to isolate it when the by-pass valve is latched.
A A system according to any one of claims 2 to 4 wherein a manual reset is provided for the bypass valve.
6. A system according to any one of claims 2 to 5 wherein the by-pass valve control system is pneumatic.
7. A system according to claim 6 wherein the control system of the by-pass valve comprises a pneumatic shuttle valve to supply air pressure to a pneumatically operated by-pass valve and the shuttle is pushed to one side by air pressure from a solenoid valve operated by the pressure switch and to the other side a manually controlled reset air pressure.
8. A system constructed substantially as described herein and illustrated in the attached diagrammatic drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9000109A GB2239614A (en) | 1990-01-03 | 1990-01-03 | Compressed-air supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9000109A GB2239614A (en) | 1990-01-03 | 1990-01-03 | Compressed-air supply system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9000109D0 GB9000109D0 (en) | 1990-03-07 |
| GB2239614A true GB2239614A (en) | 1991-07-10 |
Family
ID=10668801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9000109A Withdrawn GB2239614A (en) | 1990-01-03 | 1990-01-03 | Compressed-air supply system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2239614A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2277462A (en) * | 1993-04-26 | 1994-11-02 | Leobersdorfer Maschf | Compressor lubricating oil quality maintenance |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1947550B2 (en) * | 1968-12-30 | 1980-04-03 | Westinghouse Air Brake Co., Wilmerding, Pa. (V.St.A.) | Device for drying air in a compressed air system |
-
1990
- 1990-01-03 GB GB9000109A patent/GB2239614A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1947550B2 (en) * | 1968-12-30 | 1980-04-03 | Westinghouse Air Brake Co., Wilmerding, Pa. (V.St.A.) | Device for drying air in a compressed air system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2277462A (en) * | 1993-04-26 | 1994-11-02 | Leobersdorfer Maschf | Compressor lubricating oil quality maintenance |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9000109D0 (en) | 1990-03-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |