CA1059403A - Fluid flow control valve - Google Patents
Fluid flow control valveInfo
- Publication number
- CA1059403A CA1059403A CA269,406A CA269406A CA1059403A CA 1059403 A CA1059403 A CA 1059403A CA 269406 A CA269406 A CA 269406A CA 1059403 A CA1059403 A CA 1059403A
- Authority
- CA
- Canada
- Prior art keywords
- valve
- chamber
- fluid
- valve according
- hollow member
- 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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/04—Control of fluid pressure without auxiliary power
- G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
- G05D16/0616—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a bellow
- G05D16/0619—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a bellow acting directly on the obturator
- G05D16/0622—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a bellow acting directly on the obturator characterised by the form of the obturator
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Fluid-Driven Valves (AREA)
- Lift Valve (AREA)
Abstract
ABSTRACT OF DISCLOSURE
A valve for the automatic control of the supply of a fluid to a system, the valve comprising two chambers one of which is in communication with the fluid supply via a trickle valve, and with the system, and the other of which, being open to atmosphere, is defined by a compressible hollow member disposed Within the first chamber, and whose internal volume is determined by the difference between the pressures in the two chambers, the compressible hollow member having an aperture therein formed as a seating for a valve member disposed in the first chamber such that when the valve member is unseated the two chambers are connected, the position of the valve member being adjustable by means outside said first chamber and operative according to some condition in the system to which the fluid is supplied.
A valve for the automatic control of the supply of a fluid to a system, the valve comprising two chambers one of which is in communication with the fluid supply via a trickle valve, and with the system, and the other of which, being open to atmosphere, is defined by a compressible hollow member disposed Within the first chamber, and whose internal volume is determined by the difference between the pressures in the two chambers, the compressible hollow member having an aperture therein formed as a seating for a valve member disposed in the first chamber such that when the valve member is unseated the two chambers are connected, the position of the valve member being adjustable by means outside said first chamber and operative according to some condition in the system to which the fluid is supplied.
Description
1l)59~03 This invention relates to a valve for controlling the pressure of a fluid supplied to a system~ and ha~ for its object the provision of such a valve through which the rate of flow of the fluid is controlled both by the pressures at the inlet and outlet sides of the valves and by some other condition in the system to which the fluid is being supplied. ~xamples of such a condition are given below. -`
A~ an example of the application of such a valve, it may be used to control the supply of air to a coal washing installation in which washing water is agitated by the air supplied. In this case the other condition in the system to which the fluid i8 being supplied is the amplitude of pulsation of the water in the washing installa-tion.
Another example of the application of the valve is for regulating the supply of air to apparatus controlling the mixing of two liquids or solids. In this case the other condition in the system to which the fluid i~ being supplied i8 the variation in the supply of one of the constituents to be mixed.
According to the present invention a valve for controlling the pressure of a fluid supplied to a ~ystem, the valvo comprising two chambers one of which is in communication with the fluid ~upply and with the system and the other of which has a port through which fluid therein can escape, said other chamber being defined by a
A~ an example of the application of such a valve, it may be used to control the supply of air to a coal washing installation in which washing water is agitated by the air supplied. In this case the other condition in the system to which the fluid i8 being supplied is the amplitude of pulsation of the water in the washing installa-tion.
Another example of the application of the valve is for regulating the supply of air to apparatus controlling the mixing of two liquids or solids. In this case the other condition in the system to which the fluid i~ being supplied i8 the variation in the supply of one of the constituents to be mixed.
According to the present invention a valve for controlling the pressure of a fluid supplied to a ~ystem, the valvo comprising two chambers one of which is in communication with the fluid ~upply and with the system and the other of which has a port through which fluid therein can escape, said other chamber being defined by a
- 2 -':
A
- . . - , .. . , . .~ . . , ,. . . ~ . . ,.. . ,. . ~, .. ...
compressible hollow member disposed within said first chamber and whose internal volume i8 determined by the :
difference between the pressures in the two chambers, a surface of said hollow member being formed as a seating ^
for a valve member disposed in said first chamber, such that when the valve member is unseated said two chambers are in communication one with the other, said valve member being connected to a valve stem which passes through the interior of sa~d other chamber and outwardly thereof to abut m~vable means for ad~ustingthe position of said valve member and thu~ the pressure at which the latter becomes unseated to release fluid from said first to said second chamber.
As an example of the invention, a valve for automatically controlling the supply of air to a coal- --washing installation will now be described in greater detail with reference to the accompanying drawing which shows the valve in sectional elevation.
In the embodiment shown in the drawing the fir~t chamber is defined by a hollow casing 10 vhich via a port 11 communicates with the fluid supply via a pipe 12 and trickle valve 13, and with the system to which the fluid is to be supplied, via a pipe 14.
A plug 16 closes the ca~ing 10. The second chamber is formed by flexible bellows 17 sealed to the plug
A
- . . - , .. . , . .~ . . , ,. . . ~ . . ,.. . ,. . ~, .. ...
compressible hollow member disposed within said first chamber and whose internal volume i8 determined by the :
difference between the pressures in the two chambers, a surface of said hollow member being formed as a seating ^
for a valve member disposed in said first chamber, such that when the valve member is unseated said two chambers are in communication one with the other, said valve member being connected to a valve stem which passes through the interior of sa~d other chamber and outwardly thereof to abut m~vable means for ad~ustingthe position of said valve member and thu~ the pressure at which the latter becomes unseated to release fluid from said first to said second chamber.
As an example of the invention, a valve for automatically controlling the supply of air to a coal- --washing installation will now be described in greater detail with reference to the accompanying drawing which shows the valve in sectional elevation.
In the embodiment shown in the drawing the fir~t chamber is defined by a hollow casing 10 vhich via a port 11 communicates with the fluid supply via a pipe 12 and trickle valve 13, and with the system to which the fluid is to be supplied, via a pipe 14.
A plug 16 closes the ca~ing 10. The second chamber is formed by flexible bellows 17 sealed to the plug
- 3 -, ~ , . .
iO59403 16 at 18, and capable of compression within the casin~s 10. A port 19 in the plug 16 permits free movement of air to and from the bellows 17.
The upper rlat surface 20 Or the bellows 17 has a central aperture therein which forms a seat for a valve member 21 which is formed in one piece with a spindle 22 which passes downwardly through the bellows 17 and plug 16. The lower end Or the spindle 22 as viewed in the drawing may be connected to a float in the bed o~ the coal-washing apparatus, or, alternatively, a~ shown, can be disposed against a cam 23 which moves according to a condition prevailinl 5 in the washing apparatus.
~e casing 10 is adjustable in position by means of a pair Or internally threaded collars 24 mounted on the threaded outer surrace Or the casing above and below a Pixed support member 25, so that the valve can be raised and lowered and locked relative thereto.
In operation, air is ~upplied to the interior of the casing 10 via pipe 12 and trickle valve 13. The port 19 is ooen to the atmosphere.
Thus as the pressure within the casing 10 builds up, the bellows 17 compresses downwardly as viewed in the dra~ng and, assuming that the position of the valve member 21 does not change, the latter is thus unseated and the surplus passes from the upper chamber through the aperture in the surface 20, into the bellows 17 whence it escapes into the atmosphere through the port 19. Therefore air at a constant pressure, equal to or less than that of the supply, is supplied through the delivery pipe 14 to the system.
I~ now the position o~ the valve member 21 i8 permitted to change owing to a change in the positio~
of the ~loat or the cam 23, the pressure of the air supply needed to unseat the valve member 21 changes a¢cordingly.
It will be appeciated that upward movement o~ the valve member 21 as seen in the drawing causes a decrease in the resultant pressure in the upper chamber while downward movement causes an increase.
If necessary a spring may be provided within the bellows 17 to give enhanced accuracy.
It will be realised that a very small force is sufficient to move the valve member 21 and that that force is not materially affected by the pressure existing in the upper chamber and acting on the valve member.
, '.
The valve is set up for delivery of air at a predetermined pressure by adjusting the collar 24 and thus the height of the casing 10 relative to, in this case, the cam 23 which itsel~ determines the height of the valve member 21 according to a certain condition in the system.
It is not intended to limit the invention to the above example only, many variations, such as might readily occur to one skilled in the art being possible without departing ~rom the scope of the invention.
Thus for example, the bellows can be replaced by a plurality of sealed tubular members mounted in telescopic relationship such that the internal volume o~ the memb so ~ormed is variable.
. . , . . . . ~. - -
iO59403 16 at 18, and capable of compression within the casin~s 10. A port 19 in the plug 16 permits free movement of air to and from the bellows 17.
The upper rlat surface 20 Or the bellows 17 has a central aperture therein which forms a seat for a valve member 21 which is formed in one piece with a spindle 22 which passes downwardly through the bellows 17 and plug 16. The lower end Or the spindle 22 as viewed in the drawing may be connected to a float in the bed o~ the coal-washing apparatus, or, alternatively, a~ shown, can be disposed against a cam 23 which moves according to a condition prevailinl 5 in the washing apparatus.
~e casing 10 is adjustable in position by means of a pair Or internally threaded collars 24 mounted on the threaded outer surrace Or the casing above and below a Pixed support member 25, so that the valve can be raised and lowered and locked relative thereto.
In operation, air is ~upplied to the interior of the casing 10 via pipe 12 and trickle valve 13. The port 19 is ooen to the atmosphere.
Thus as the pressure within the casing 10 builds up, the bellows 17 compresses downwardly as viewed in the dra~ng and, assuming that the position of the valve member 21 does not change, the latter is thus unseated and the surplus passes from the upper chamber through the aperture in the surface 20, into the bellows 17 whence it escapes into the atmosphere through the port 19. Therefore air at a constant pressure, equal to or less than that of the supply, is supplied through the delivery pipe 14 to the system.
I~ now the position o~ the valve member 21 i8 permitted to change owing to a change in the positio~
of the ~loat or the cam 23, the pressure of the air supply needed to unseat the valve member 21 changes a¢cordingly.
It will be appeciated that upward movement o~ the valve member 21 as seen in the drawing causes a decrease in the resultant pressure in the upper chamber while downward movement causes an increase.
If necessary a spring may be provided within the bellows 17 to give enhanced accuracy.
It will be realised that a very small force is sufficient to move the valve member 21 and that that force is not materially affected by the pressure existing in the upper chamber and acting on the valve member.
, '.
The valve is set up for delivery of air at a predetermined pressure by adjusting the collar 24 and thus the height of the casing 10 relative to, in this case, the cam 23 which itsel~ determines the height of the valve member 21 according to a certain condition in the system.
It is not intended to limit the invention to the above example only, many variations, such as might readily occur to one skilled in the art being possible without departing ~rom the scope of the invention.
Thus for example, the bellows can be replaced by a plurality of sealed tubular members mounted in telescopic relationship such that the internal volume o~ the memb so ~ormed is variable.
. . , . . . . ~. - -
Claims (10)
1. A valve for controlling the pressure of a fluid supplied to a system, the valve comprising two chambers one of which is in communication with the fluid supply and with the system and the other of which has a port through which fluid therein can escape, said other chamber being defined by a compressible hollow member disposed within said first chamber and whose internal volume is determined by the difference between the pressures in the two chambers, a surface of said hollow member being formed as a seating for a valve member disposed in said first chamber, such that when the valve member is unseated said two chambers are in communication one with the other, said valve member being connected to a valve stem which passes through the interior of said other chamber and outwardly thereof to abut movable means for adjusting the position of said valve member and thus the pressure at which the latter becomes unseated to release fluid from said first to said second chamber.
2. A valve according to claim 1, wherein said hollow member comprises flexible bellows having said valve seating at one end thereof.
3. A valve according to claim 2, wherein said valve seating is formed as an aperture in the end wall of said flexible bellows, the valve member having a portion which seats in said aperture.
4. A valve according to claim 1, comprising a valve body serving to define said first chamber inter-nally, said compressible hollow member being attached in sealing engagement to a removable plug closing said valve body.
5. A valve according to claim 4, wherein said valve body is adjustable relative to said valve member.
6. A valve according to claim 1, wherein said first chamber has a single port which communicates with a duct carrying said fluid from said fluid supply to said system.
7. A valve according to claim 1, wherein said other chamber is connected permanently to atmosphere.
8. A valve according to claim 1, wherein said first chamber communicates with said fluid supply via a trickle valve.
9. A valve according to claim 1, wherein said compressible hollow member is normally urged into an expanded condition by means of a resilient member disposed within said hollow member.
10. A valve according to claim 4, wherein said valve body is adjustable by means of a pair of internally threaded collars mounted on a threaded outer surface of the valve body above and below a fixed support member respectively, whereby the valve body may be adjusted to a desired position and locked therein.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3679/76A GB1556202A (en) | 1976-01-30 | 1976-01-30 | Fluid flow control valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1059403A true CA1059403A (en) | 1979-07-31 |
Family
ID=9762882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA269,406A Expired CA1059403A (en) | 1976-01-30 | 1977-01-10 | Fluid flow control valve |
Country Status (4)
| Country | Link |
|---|---|
| AU (1) | AU501998B2 (en) |
| CA (1) | CA1059403A (en) |
| GB (1) | GB1556202A (en) |
| ZA (1) | ZA77112B (en) |
-
1976
- 1976-01-30 GB GB3679/76A patent/GB1556202A/en not_active Expired
-
1977
- 1977-01-10 CA CA269,406A patent/CA1059403A/en not_active Expired
- 1977-01-10 ZA ZA770112A patent/ZA77112B/en unknown
- 1977-01-13 AU AU21294/77A patent/AU501998B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| AU2129477A (en) | 1978-07-20 |
| AU501998B2 (en) | 1979-07-12 |
| ZA77112B (en) | 1977-11-30 |
| GB1556202A (en) | 1979-11-21 |
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