CA1083008A - Axial flow throttling valve; and automatically varying restrictor - Google Patents
Axial flow throttling valve; and automatically varying restrictorInfo
- Publication number
- CA1083008A CA1083008A CA280,240A CA280240A CA1083008A CA 1083008 A CA1083008 A CA 1083008A CA 280240 A CA280240 A CA 280240A CA 1083008 A CA1083008 A CA 1083008A
- Authority
- CA
- Canada
- Prior art keywords
- valve
- fluid
- passage
- chamber
- flow
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
- F16K7/02—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm
- F16K7/04—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm constrictable by external radial force
- F16K7/07—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm constrictable by external radial force by means of fluid pressure
- F16K7/075—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm constrictable by external radial force by means of fluid pressure a rigid body being located within the tubular diaphragm
-
- 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
- G05D16/063—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 membrane
- G05D16/0638—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 membrane characterised by the form of the obturator
- G05D16/0641—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 membrane characterised by the form of the obturator the obturator is a membrane
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Control Of Fluid Pressure (AREA)
- Flow Control (AREA)
- Fluid-Driven Valves (AREA)
Abstract
AXIAL FLOW THROTTLING VALVE
Abstract of the Disclosure This application discloses a tube-type throttling valve assembly and the particular construction of the valve, along with the control passages and associated pilot controls.
Abstract of the Disclosure This application discloses a tube-type throttling valve assembly and the particular construction of the valve, along with the control passages and associated pilot controls.
Description
~3~
AXIAL FLOW THROTTLING VALVE
Back~round of the Invention This invention relates to a flexible tube-type throttling valve assembly particularly useful in gas pressure control.
In a preferred configuration, an expansible tube is carried on a core sleeve which is shaped for easy and economical construction and assembly. The sleeve has axially spaced inlet and outlet openings with an intermediate barrierpreventing axial flow through the sleeve. This sub-assembly is inserted into thebody of the valve and seated on bosses provided in the valve and the cover member. A chamber for control fluid is provided in the body around the flexible tube, and fluid passageway means is provided from upstream of the valve to transmit the upstream fluid to the chamber. In this passageway is an aofomatically varying flow restrictor for controlling the rate of admission of fluid to the chamber. In addition, a passageway to the downstream side of the valve, controlled by pilot means, regulates the rate of outflow of fluid from the chamber.
Objects of the lnvention It is an object of this invention to provide a flexible tube-type valve which maintains a more uniform pressure level over a wider range of flow rates than previous devices.
It is a further object of this invention to provide a variable restrictor in the upstream line to the control chamber to enhance the effect of the pilot means for regulating the outflow of fluid from the chamber.
It is a further important object of this invention to provide a compact unitary control assembly which is easy to assemble and maintain, and which is useful in a variety of services, by merely using the pilot for the desired range. ~i Brief Summary of the Invention In accordance with this invention, the assembly comprises a flexible, expansible tube stretched over a core sleeve having upstream and downstream flow openings and an intermediate barrier blocking axial flow. A seriqs of openings around the core are arranged to be selectively covered and uncovered ~ 30 by the flexible tube in response to differenetial pressures on the tube. For this -1- ~ ~
:. . : . .
::: ::
~8300~3 purpose a chamber around the tube is connected to the upstream and downstr~am flow passages. In the downstream passage is a pilot valve for controlling withdrawal of fluid from the chamber, while in the upstream passage is mounted an automatically varying restrictor Eor simultaneously automatically controlling entry of pressure fluid to the chamber. All the control fluid passages, the pilot valve, and the automatic restrictor are installed in the valve housing, making an efficient and compact installation. Provision is made for mounting a variety of pilot control elements, to allow a wide range of services from this configuration.
The part, improvement or combination in which an exclusive property or privilege is claimed is a self-contained valve assembly ~or controlling the flow of fluid in a pipeline, comprising a housing having a main fluid passage therethrough, cage means and a resilient boot member in the main passage for controlling the flow of fluid therethrough, a chamber formed in the housing around at least a portion of the boot means, upstream passage means wholly contained within the housing connecting the chamber with the main passage at a point upstream of the cage, ;~
downstream passage means wholly contained within the housing connecting the chamber with the fluid passage at a point down-stream of the cage, means on the housing for mounting a diaphragm contolled pilot valve means for controlling the flow of fluid from the chamber through the downstream passage means. The com-bination may further include a diaphragm controlled pilot valve mounted in the housing to control the flow of fluid from the chamber through the downstream passage means and means on the pilot valve to facilitate a fluid connection between the diaphragm of the valve and the pipeline downstream of the valve.
A variable restrictor may be included in the upstream passage -~
means. ;~
101330~
BRI~F DESCRIPTION OF TIIE DRAWINGS
Figure 1 is a lonyitudinal sec-tional view oE one embodiment of an expansible tube thro-ttling valve assembly;
Figure 2 is a similar sectional view of the control passages and the automatic restrictor on a larger scale, and Figure 3 is a graph of pressure vs. flow showing the improved performance attained by the au-tomatic restrictor. ,-DESCRIPTION OF THE PREFERRED EMBODIMENT
The assembly as shown in Figure 1 includes a valve 10 having a housing 11 and a control element 70. Housing 11 includes a body 20 and a cover member 28 over one end of the body. Inside body 20, in the flow passage, is a slotted cage 22 with a barrier 24, and a resilient expansible sleeve 26 held in place by a cover member 28. The assembly has an inlet passage 12 and outlet passage 14. This assembly is adapted to be mounted in a fluid line 16a-16b and to be held in place by the flanges of the pipeline. These flanges are drawn together to hold the valve between them by bolts one of whlch is shown at 18.
As depicted in Figure 1, the expansible sleeve 26 is ~20 ~ shaped with inturned flQnge members 32 on either end. Sleeve 26 is pulled o~er cage 22,; then inserted into body 20 until the flange and corresponding end of cage 22 abut shoulder 34 on outlet 14. Cover member 28, with inlet passage 12, is made to interfit with body 20, and has a shoulder 36 adapted to engage the other end of cage 22 and the other inturned flange 32 of the sleeve 26.
Suitable seaI means 38 is located between cover 28 and body 20.
A chamber 30 surrounds sleeve 26~ Referring to Figures 1 and 2, it ' -2a-.. , , : , , . .. .
~33~
can be seen that the top 40 of valve bo(ly 20 is enlaryed to accommo-iate portiny and manifold 42, which is open to chamber 30. The ports 44 ancl 46 connect manifold 42 to the upstream pressure and the downstream side of valve 10, respectively.
With reference to Figure 2, we see the inlet line consists of bore 48 in cover 28, connected to port 44. The bore 4B has a step or shoulder 50 and an enlarged portion 52 in which is mounted a floating plug 54. Plug 54 has a tapered nose portion 56 which cooperates with shoulder 50 to govern the inflow of fluid to port 44. Plug 54 also has a shoulder 58 against which a spring 60 bears. The other end of spring 60 is seated on shoulder 50 to bias plug 54 towards the openposition. A longitudinal bore 62 through plug 54 allows the upstream pressure toact agairs~ the end 64 of the plug. O-ring 66 seals the bore 52, andthreaded cap68 closes the end of the bore and provides a limit stop for plug 54.
From the foregoing, it will be seen that the upstream pressure is transmitted through bore 48 and port 44 to mqnifold 42 (and chamber 30), subjectto restriction by floating plug 54.
Referring to Figures I and 2, on the outlet side of manifold 42, port 46 connects to a pilot regulator 70. In the illustrated embodiment, regulator 70has a spring-biased diaphrqgm 72, which is acted upon by downstream pressure through port 74. Variations in this downstream pressure, which is conducted to port 74 by piping which is not shown, modify the position of the diaphragm, which is connected to a pilot valve 76 seated in a recess 78 in the top 40 of the valve body 20 by a valve stem 80, in a well-known consfruction for pilot regulators.
The construction of the pilot regulator, except as herein described is too weil-known to require further amplification. Depending on the range of service desired, any of a number of pilot regulators can be used in the manner describedherein.
The seat assembly 82 of valve 76 is threaded into the small portion af a stepped bore 84 in the bottom of regulator 70. The bottom face 86 of the regulator seats upon the top 40 of valve body 20, and is sealed, as by 0-ring seal 88.
In this embodiment, seat assembly 82 projects from the bottom of :, ~
.
l~B3~
regulallor 70 into recess 7~3 in the ~op of mairl valve bod~/ 20.
Another seal 90 seals Ihe interface between recess 7~ and seat assembly 82 in the top 40 of the main valve body.
Referring now to Figure 2, counterbore 92 of stepped bore 84 is connected to manifold 42 by outlet port 46. ~round seat assembly stem 94 radial holes 96 connect this counterbore area 92 with axial passage 98 in ~he seat stem94. Valve stem 80, connected with diaphragm 72, projects through passage 98, with an O-ring seal 100 sealing the upper portion ofthe stem 80 in passage 98.
Stem 80 has a reduced diameter portion 102, providing considerable clearance forflow of fluid in passage 98. On the bottom is sealing member 104 of stem 80 to engage the bottom of se~t stem 94, to block flow of fluid from passage 98 when the pilot regulator 7û is in one limit position. This sealing member is retained on stem 80 by a nut 106 threaded on threaded portion 108 of stem 80.
The recess 78 in the body is sufficiently deep to altow movement of stem 80 in response to movement of diaphragm 72. In the wall of recess 78 below valve 76 is an outlet port 110 which connects the recess with outlet passage 14 downstream of cage 2~. From the foregoing, it will be seen that the pressure in manifold 42 and chamber 30 is controlled in part by the pilot 70, which is itself governed by the pressure downstream of the valve 10. Modifying 2û the manifold pressure is the floating plug, or variable restrictor 54.
It is obvious that any of a number of pilot controls is useful with this assembly, and the manifold ports can be adjusted to suit the requirements of thedifferent pilots. For example~ the outlet port 46 from manifold 42 could enter recess 78 at the bottom, and outlet port 110 to the downstream passage 14 could connect with counterbore 92.
Turning now to Figure 3, we see a comparison oF the perforrnances of a given throttling valve assembly. The differences in performance were caused by changes in ~the inlet flow to the manifold. In the one case, an open line connecting the inlet 12 of the valve with manifold 42 was used. Placing a fixed restrictor in the line, as is commonly done at present, increased the range of flow rates over which the assembly was operable, but the pressure drop for each increment in flow rates was still largeO With the variable restrictor in the inlet .
3~
iine to con~rol inlet flow to Ihe marlifold, ~h~e pressure rernain~d nearly constant over essentially the en~ire ranCJe o~ flow rates. Thus, it an be seen that fluctuating demand rates downs~ream, varying the rate of flow through this assembly, has a minimal effect on downstrearn line pressure, providing improved performance in operation.
In operation, as demand changes downstream, the pilot regulator 70 changes the setting of valve 76, changing the pressure in manifold 42 and control chamber 30. Flow into chamber 30 is modified by variable restrictor 54, and provides the operating characteristics shown on Figure 3 as the curve labeled lû "with variable restrictorO" As an example, if flow through valve 10 is low or minimal, the variable restrictor is open its widest, under the influence of spring 60 and the differential pressure. If added load downstream decreases the downstream pressure9 the diaphragm of pilot regulator 70 moves downwardly, as seen in Figures I and 2, opening pilot valve 76. This produces a drop in pressure in manifold 42, and a corresponding pressure drop on shoulder 58 of piug 54.
Upstream pressure, applied through bore 62 to the top 64, moves floating plug 54downwardly into bore 48 restricting the flow around the plug into the inlet port44 and maniFold 42. This allows resitient sleeve 26 to open further, due to the increased pressure différential between inlet 12 and control chamber 30. On the opening of boot 26, increased flow takes place, which restores the pressure downstream, which in turn moves pilot regulator 70 to a more restrictive openingof its valve 76. This in turn restricts the flow through port 46 which, in its tvrn, -;
increases the pressure in manifold 42 and control chamber 3û. The increased pressure in the manifold is also transmitted to shoulder 58 of floating plug 54,floating plug 54 adjusts to the pressure increase influenced by shoulder 58 and spring 60. `
As can be seen from the above description of the operation of the floating plug in the automatic restrictor, it acts to modify the operation of the system. Obviously, if the load downstream decreases, the reverse operation of the system takes place. The modifying effect is shown in Figure 3, giving a verysmall change in pressure for relatively large changes in flow rates as compared -- to previous methods of modification of the inlet line.
.
AXIAL FLOW THROTTLING VALVE
Back~round of the Invention This invention relates to a flexible tube-type throttling valve assembly particularly useful in gas pressure control.
In a preferred configuration, an expansible tube is carried on a core sleeve which is shaped for easy and economical construction and assembly. The sleeve has axially spaced inlet and outlet openings with an intermediate barrierpreventing axial flow through the sleeve. This sub-assembly is inserted into thebody of the valve and seated on bosses provided in the valve and the cover member. A chamber for control fluid is provided in the body around the flexible tube, and fluid passageway means is provided from upstream of the valve to transmit the upstream fluid to the chamber. In this passageway is an aofomatically varying flow restrictor for controlling the rate of admission of fluid to the chamber. In addition, a passageway to the downstream side of the valve, controlled by pilot means, regulates the rate of outflow of fluid from the chamber.
Objects of the lnvention It is an object of this invention to provide a flexible tube-type valve which maintains a more uniform pressure level over a wider range of flow rates than previous devices.
It is a further object of this invention to provide a variable restrictor in the upstream line to the control chamber to enhance the effect of the pilot means for regulating the outflow of fluid from the chamber.
It is a further important object of this invention to provide a compact unitary control assembly which is easy to assemble and maintain, and which is useful in a variety of services, by merely using the pilot for the desired range. ~i Brief Summary of the Invention In accordance with this invention, the assembly comprises a flexible, expansible tube stretched over a core sleeve having upstream and downstream flow openings and an intermediate barrier blocking axial flow. A seriqs of openings around the core are arranged to be selectively covered and uncovered ~ 30 by the flexible tube in response to differenetial pressures on the tube. For this -1- ~ ~
:. . : . .
::: ::
~8300~3 purpose a chamber around the tube is connected to the upstream and downstr~am flow passages. In the downstream passage is a pilot valve for controlling withdrawal of fluid from the chamber, while in the upstream passage is mounted an automatically varying restrictor Eor simultaneously automatically controlling entry of pressure fluid to the chamber. All the control fluid passages, the pilot valve, and the automatic restrictor are installed in the valve housing, making an efficient and compact installation. Provision is made for mounting a variety of pilot control elements, to allow a wide range of services from this configuration.
The part, improvement or combination in which an exclusive property or privilege is claimed is a self-contained valve assembly ~or controlling the flow of fluid in a pipeline, comprising a housing having a main fluid passage therethrough, cage means and a resilient boot member in the main passage for controlling the flow of fluid therethrough, a chamber formed in the housing around at least a portion of the boot means, upstream passage means wholly contained within the housing connecting the chamber with the main passage at a point upstream of the cage, ;~
downstream passage means wholly contained within the housing connecting the chamber with the fluid passage at a point down-stream of the cage, means on the housing for mounting a diaphragm contolled pilot valve means for controlling the flow of fluid from the chamber through the downstream passage means. The com-bination may further include a diaphragm controlled pilot valve mounted in the housing to control the flow of fluid from the chamber through the downstream passage means and means on the pilot valve to facilitate a fluid connection between the diaphragm of the valve and the pipeline downstream of the valve.
A variable restrictor may be included in the upstream passage -~
means. ;~
101330~
BRI~F DESCRIPTION OF TIIE DRAWINGS
Figure 1 is a lonyitudinal sec-tional view oE one embodiment of an expansible tube thro-ttling valve assembly;
Figure 2 is a similar sectional view of the control passages and the automatic restrictor on a larger scale, and Figure 3 is a graph of pressure vs. flow showing the improved performance attained by the au-tomatic restrictor. ,-DESCRIPTION OF THE PREFERRED EMBODIMENT
The assembly as shown in Figure 1 includes a valve 10 having a housing 11 and a control element 70. Housing 11 includes a body 20 and a cover member 28 over one end of the body. Inside body 20, in the flow passage, is a slotted cage 22 with a barrier 24, and a resilient expansible sleeve 26 held in place by a cover member 28. The assembly has an inlet passage 12 and outlet passage 14. This assembly is adapted to be mounted in a fluid line 16a-16b and to be held in place by the flanges of the pipeline. These flanges are drawn together to hold the valve between them by bolts one of whlch is shown at 18.
As depicted in Figure 1, the expansible sleeve 26 is ~20 ~ shaped with inturned flQnge members 32 on either end. Sleeve 26 is pulled o~er cage 22,; then inserted into body 20 until the flange and corresponding end of cage 22 abut shoulder 34 on outlet 14. Cover member 28, with inlet passage 12, is made to interfit with body 20, and has a shoulder 36 adapted to engage the other end of cage 22 and the other inturned flange 32 of the sleeve 26.
Suitable seaI means 38 is located between cover 28 and body 20.
A chamber 30 surrounds sleeve 26~ Referring to Figures 1 and 2, it ' -2a-.. , , : , , . .. .
~33~
can be seen that the top 40 of valve bo(ly 20 is enlaryed to accommo-iate portiny and manifold 42, which is open to chamber 30. The ports 44 ancl 46 connect manifold 42 to the upstream pressure and the downstream side of valve 10, respectively.
With reference to Figure 2, we see the inlet line consists of bore 48 in cover 28, connected to port 44. The bore 4B has a step or shoulder 50 and an enlarged portion 52 in which is mounted a floating plug 54. Plug 54 has a tapered nose portion 56 which cooperates with shoulder 50 to govern the inflow of fluid to port 44. Plug 54 also has a shoulder 58 against which a spring 60 bears. The other end of spring 60 is seated on shoulder 50 to bias plug 54 towards the openposition. A longitudinal bore 62 through plug 54 allows the upstream pressure toact agairs~ the end 64 of the plug. O-ring 66 seals the bore 52, andthreaded cap68 closes the end of the bore and provides a limit stop for plug 54.
From the foregoing, it will be seen that the upstream pressure is transmitted through bore 48 and port 44 to mqnifold 42 (and chamber 30), subjectto restriction by floating plug 54.
Referring to Figures I and 2, on the outlet side of manifold 42, port 46 connects to a pilot regulator 70. In the illustrated embodiment, regulator 70has a spring-biased diaphrqgm 72, which is acted upon by downstream pressure through port 74. Variations in this downstream pressure, which is conducted to port 74 by piping which is not shown, modify the position of the diaphragm, which is connected to a pilot valve 76 seated in a recess 78 in the top 40 of the valve body 20 by a valve stem 80, in a well-known consfruction for pilot regulators.
The construction of the pilot regulator, except as herein described is too weil-known to require further amplification. Depending on the range of service desired, any of a number of pilot regulators can be used in the manner describedherein.
The seat assembly 82 of valve 76 is threaded into the small portion af a stepped bore 84 in the bottom of regulator 70. The bottom face 86 of the regulator seats upon the top 40 of valve body 20, and is sealed, as by 0-ring seal 88.
In this embodiment, seat assembly 82 projects from the bottom of :, ~
.
l~B3~
regulallor 70 into recess 7~3 in the ~op of mairl valve bod~/ 20.
Another seal 90 seals Ihe interface between recess 7~ and seat assembly 82 in the top 40 of the main valve body.
Referring now to Figure 2, counterbore 92 of stepped bore 84 is connected to manifold 42 by outlet port 46. ~round seat assembly stem 94 radial holes 96 connect this counterbore area 92 with axial passage 98 in ~he seat stem94. Valve stem 80, connected with diaphragm 72, projects through passage 98, with an O-ring seal 100 sealing the upper portion ofthe stem 80 in passage 98.
Stem 80 has a reduced diameter portion 102, providing considerable clearance forflow of fluid in passage 98. On the bottom is sealing member 104 of stem 80 to engage the bottom of se~t stem 94, to block flow of fluid from passage 98 when the pilot regulator 7û is in one limit position. This sealing member is retained on stem 80 by a nut 106 threaded on threaded portion 108 of stem 80.
The recess 78 in the body is sufficiently deep to altow movement of stem 80 in response to movement of diaphragm 72. In the wall of recess 78 below valve 76 is an outlet port 110 which connects the recess with outlet passage 14 downstream of cage 2~. From the foregoing, it will be seen that the pressure in manifold 42 and chamber 30 is controlled in part by the pilot 70, which is itself governed by the pressure downstream of the valve 10. Modifying 2û the manifold pressure is the floating plug, or variable restrictor 54.
It is obvious that any of a number of pilot controls is useful with this assembly, and the manifold ports can be adjusted to suit the requirements of thedifferent pilots. For example~ the outlet port 46 from manifold 42 could enter recess 78 at the bottom, and outlet port 110 to the downstream passage 14 could connect with counterbore 92.
Turning now to Figure 3, we see a comparison oF the perforrnances of a given throttling valve assembly. The differences in performance were caused by changes in ~the inlet flow to the manifold. In the one case, an open line connecting the inlet 12 of the valve with manifold 42 was used. Placing a fixed restrictor in the line, as is commonly done at present, increased the range of flow rates over which the assembly was operable, but the pressure drop for each increment in flow rates was still largeO With the variable restrictor in the inlet .
3~
iine to con~rol inlet flow to Ihe marlifold, ~h~e pressure rernain~d nearly constant over essentially the en~ire ranCJe o~ flow rates. Thus, it an be seen that fluctuating demand rates downs~ream, varying the rate of flow through this assembly, has a minimal effect on downstrearn line pressure, providing improved performance in operation.
In operation, as demand changes downstream, the pilot regulator 70 changes the setting of valve 76, changing the pressure in manifold 42 and control chamber 30. Flow into chamber 30 is modified by variable restrictor 54, and provides the operating characteristics shown on Figure 3 as the curve labeled lû "with variable restrictorO" As an example, if flow through valve 10 is low or minimal, the variable restrictor is open its widest, under the influence of spring 60 and the differential pressure. If added load downstream decreases the downstream pressure9 the diaphragm of pilot regulator 70 moves downwardly, as seen in Figures I and 2, opening pilot valve 76. This produces a drop in pressure in manifold 42, and a corresponding pressure drop on shoulder 58 of piug 54.
Upstream pressure, applied through bore 62 to the top 64, moves floating plug 54downwardly into bore 48 restricting the flow around the plug into the inlet port44 and maniFold 42. This allows resitient sleeve 26 to open further, due to the increased pressure différential between inlet 12 and control chamber 30. On the opening of boot 26, increased flow takes place, which restores the pressure downstream, which in turn moves pilot regulator 70 to a more restrictive openingof its valve 76. This in turn restricts the flow through port 46 which, in its tvrn, -;
increases the pressure in manifold 42 and control chamber 3û. The increased pressure in the manifold is also transmitted to shoulder 58 of floating plug 54,floating plug 54 adjusts to the pressure increase influenced by shoulder 58 and spring 60. `
As can be seen from the above description of the operation of the floating plug in the automatic restrictor, it acts to modify the operation of the system. Obviously, if the load downstream decreases, the reverse operation of the system takes place. The modifying effect is shown in Figure 3, giving a verysmall change in pressure for relatively large changes in flow rates as compared -- to previous methods of modification of the inlet line.
.
Claims (3)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A self-contained valve assembly for controlling the flow of fluid in a pipeline, comprising a housing having a main fluid passage therethrough, cage means and a resilient boot member in said main passage for controlling the flow of fluid therethrough, a chamber formed in the housing around at least a portion of said boot means, upstream passage means wholly con-tained within said housing connecting said chamber with said main passage at a point upstream of said cage, downstream passage means wholly contained within said housing connecting said chamber with said fluid passage at a point downstream of said cage, means on said housing for mounting a diaphragm controlled pilot valve means for controlling the flow of fluid from said chamber through said downstream passage means.
2. The invention defined in claim 1 together with a diaphragm controlled pilot valve mounted in said housing to control the flow of fluid from said chamber through said down-stream passage means and means on said pilot valve to facilitate a fluid connection between the diaphragm of said valve and said pipeline downstream of said valve.
3. The invention defined in claim 1 or 2 together with a variable restrictor in said upstream passage means.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US69749376A | 1976-06-18 | 1976-06-18 | |
| US69749276A | 1976-06-18 | 1976-06-18 | |
| US697,492 | 1976-06-18 | ||
| US697,493 | 1976-06-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1083008A true CA1083008A (en) | 1980-08-05 |
Family
ID=27106030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA280,240A Expired CA1083008A (en) | 1976-06-18 | 1977-06-10 | Axial flow throttling valve; and automatically varying restrictor |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS531328A (en) |
| AU (1) | AU514992B2 (en) |
| BR (1) | BR7703963A (en) |
| CA (1) | CA1083008A (en) |
| DE (1) | DE2727225A1 (en) |
| FR (1) | FR2355327A1 (en) |
| GB (1) | GB1582644A (en) |
| NL (1) | NL7706591A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59104326A (en) * | 1982-12-04 | 1984-06-16 | Toyo Jozo Co Ltd | Stable oral preparation of macrolide antibiotic substance, and method for stabilizing the same |
| US4624442A (en) * | 1985-01-23 | 1986-11-25 | Duffy John W | Control regulator having a rolling diaphragm |
| ITUA20161689A1 (en) * | 2016-03-15 | 2017-09-15 | Madas Srl | Hydraulic brake |
| IT201900002529A1 (en) * | 2019-02-21 | 2020-08-21 | Giacomini Spa | VALVE FOR HYDRAULIC REGULATION AND BALANCING OF FLUID FLOW |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2331291A (en) * | 1942-11-04 | 1943-10-12 | Fluid Control Engineering Co | Fluid flow control device |
| US2650607A (en) * | 1949-02-23 | 1953-09-01 | M & J Engineering Co | Gas flow control apparatus |
| US3138174A (en) * | 1961-11-13 | 1964-06-23 | William V Gilpin | Automatic excess fluid flow valve |
| US3592223A (en) * | 1969-11-06 | 1971-07-13 | Cla Val Co | Pilot-operated modulating valve system and flow stabilizer incorporated therein |
| US3669142A (en) * | 1970-10-16 | 1972-06-13 | Grove Valve & Regulator Co | Expansible tube valve with low pressure bleed |
| CA949539A (en) * | 1972-08-02 | 1974-06-18 | Ian F. Norton | Flush valve |
| US4026513A (en) * | 1975-11-06 | 1977-05-31 | Grove Valve And Regulator Company | Pilot valve |
-
1977
- 1977-06-07 AU AU25884/77A patent/AU514992B2/en not_active Expired
- 1977-06-10 CA CA280,240A patent/CA1083008A/en not_active Expired
- 1977-06-10 GB GB2431377A patent/GB1582644A/en not_active Expired
- 1977-06-15 NL NL7706591A patent/NL7706591A/en not_active Application Discontinuation
- 1977-06-16 DE DE19772727225 patent/DE2727225A1/en not_active Ceased
- 1977-06-17 FR FR7718672A patent/FR2355327A1/en active Granted
- 1977-06-17 BR BR7703963A patent/BR7703963A/en unknown
- 1977-06-17 JP JP7193077A patent/JPS531328A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR2355327B1 (en) | 1983-06-10 |
| GB1582644A (en) | 1981-01-14 |
| AU2588477A (en) | 1978-12-14 |
| FR2355327A1 (en) | 1978-01-13 |
| DE2727225A1 (en) | 1977-12-29 |
| JPS531328A (en) | 1978-01-09 |
| NL7706591A (en) | 1977-12-20 |
| BR7703963A (en) | 1978-02-21 |
| AU514992B2 (en) | 1981-03-12 |
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