WO2008140327A2 - A constant-flow valve assembly - Google Patents

A constant-flow valve assembly Download PDF

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Publication number
WO2008140327A2
WO2008140327A2 PCT/NO2008/000168 NO2008000168W WO2008140327A2 WO 2008140327 A2 WO2008140327 A2 WO 2008140327A2 NO 2008000168 W NO2008000168 W NO 2008000168W WO 2008140327 A2 WO2008140327 A2 WO 2008140327A2
Authority
WO
WIPO (PCT)
Prior art keywords
choke
valve
choke valve
constant
piston
Prior art date
Application number
PCT/NO2008/000168
Other languages
French (fr)
Other versions
WO2008140327A3 (en
Inventor
Bernt Sigve AADNØY
Original Assignee
Universitetet I Stavanger
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Universitetet I Stavanger filed Critical Universitetet I Stavanger
Publication of WO2008140327A2 publication Critical patent/WO2008140327A2/en
Publication of WO2008140327A3 publication Critical patent/WO2008140327A3/en

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • G05D7/01—Control of flow without auxiliary power
    • G05D7/0126—Control of flow without auxiliary power the sensing element being a piston or plunger associated with one or more springs

Definitions

  • This invention relates to a constant-flow valve assembly. More particularly, it relates to a constant-flow valve assembly comprising a first adjustable choke valve and a second choke valve, and in which the relative position of a movable, sealing piston or diaphragm determines the opening of the second choke valve, and in which a supply pipe communicates with the first choke valve and the piston or the diaphragm, insofar as fluid from the supply pipe drives the piston or the diaphragm in the closing direction of the second choke valve, and in which the outlet of the first choke valve communicates with the inlet of the second choke valve, and in which fluid from the outlet of the first choke valve drives the piston or the diaphragm in the opening direction of the second choke valve, and in which the second choke valve communicates with an outlet located downstream thereof.
  • At least one first choke valve is located in a manifold separated from the second choke valve, the outlet of the first choke valve being connected to the inlet of the second choke valve by means of a pipe connection.
  • Prior art constant-flow valves are used in a number of applications to ensure that a fluid flow remains constant despite of variations occurring in, for example, the pressure, temperature or viscosity of the flowing fluid.
  • a known principle of operation for a constant-flow valve involves directing the flowing fluid through two chokes connected in series.
  • the pressure drop across the first choke is kept constant by adjusting the pressure drop across the second choke relative to variations in the total pressure drop across the constant-flow valve.
  • this second choke must be readjusted in order to change the flow rate of the constant-flow valve.
  • a larger flow rate in a constant-flow valve of this type requires an increased pressure drop across the first choke. Thereby, the adjustment area becomes relatively small, for example 1:10, if a reasonable accuracy is to be maintained.
  • the constant-flow valve must be disassembled for replacement of the first choke, after which the constant-flow valve must be recalibrated.
  • US patent 5 494 070 describes a constant-flow valve of such a construction.
  • the first choke is located in a movable, sealing piston, in which the input pressure of the fluid acts on one side of the piston, and a spring is biased against the opposite side of the piston.
  • the fluid pressure exerted by the fluid having flowed through the first choke also acts on the spring side of the piston.
  • a valve body is connected to the piston and corresponds to a valve seat within the housing of the constant-flow valve. Collectively, the valve body and valve seat comprise the second choke.
  • the flow rate is adjusted by virtue of moving the valve body relative to the piston, whereby the second choke opens in response to an altered force exerted by the spring.
  • NO 319627 and US 6.026.849 concern constant-flow valves, in which the chokes of the valves are arranged in adjacent housing portions.
  • the object of the invention is to remedy or at least reduce one or more of the disadvantages of the prior art.
  • a constant-flow valve assembly in accordance with the invention comprises a first adjustable choke valve and a second choke valve, in which the relative position of a movable sealing piston or diaphragm determines the opening of the second choke valve, and in which a supply pipe communicates with the first choke valve and the piston or the diaphragm, insofar as fluid from the supply pipe drives the piston or the diaphragm in the closing direction of the second choke valve, and in which the outlet of the first choke valve communicates with the inlet of the second choke valve, and in which fluid from the outlet of the first choke valve drives the piston or the diaphragm in the opening direction of the second choke valve, the second choke valve communicating with an outlet located downstream thereof.
  • a constant-flow valve assembly in accordance with the invention is characterized in that at least one first choke valve is located in a manifold separated from the second choke valve, the outlet of the first choke valve being connected to the inlet of the second choke valve by means of a pipe connection.
  • the manifold advantageously may be located above sea level, for example in an operating panel, whereas the second choke valve is submerged.
  • the spindle of the first choke being motor-driven, the first choke may be set remotely. Thereby, the manifold may also be submerged.
  • a flow rate gauge is associated with the first choke valve, insofar as the fluid flow passes through the first choke valve.
  • the flow rate gauge may be connected in a selective manner to each first choke valve, for example by means of a change over valve .
  • a plurality of second choke valves may be located in a joint adjustment valve housing within which each of the second choke valves is connected to its respective first choke valve .
  • the constant-flow valve assembly according to the invention renders possible to provide several advantageous configurations, which is possible to a very limited extent when using prior art constant-flow valves.
  • prior art constant-flow valves have a relatively large extent, thereby requiring a considerable area in a control panel.
  • a manifold provided with a plurality of first choke valves according to the invention so as to form the setting part of the valve occupies only an insignificant area.
  • the cooperating second choke valves, which form the adjustment part of the valve advantageously are located at the point of consumption of the fluid flowing through the valves .
  • Figure 2 shows, in section, a setting part and an adjustment part when a second choke is open
  • Figure 3 shows, in section, the setting part and the adjustment part when the second choke is closed.
  • reference numeral 1 denotes a constant-flow valve assembly comprising a manifold 2 within which three first choke valves 4 are arranged and communicate with a respective one of three cooperating second choke valves 6 located each in a respective adjustment valve housing 8.
  • the three first choke valves 4 and the three second choke valves 6 are supplied with fluid from a supply pipe 10 via a manifold inlet 12 in the manifold 2 and an adjustment inlet 14 in each of the adjustment valve housings 8, respectively.
  • the outlet 15 of each first choke 4 is connected to the inlet 16 of its respective second choke 6 by means of a pipe connection 18.
  • a cooperating first choke 4 and second choke 8 is explained. It is implied that the other first chokes 4 and second chokes 6 in the valve assembly 1 function in a corresponding manner.
  • An inlet bore 20 extends from the manifold inlet 12 to the first choke 4.
  • the first choke 4 comprises a first choke bore 22 and a corresponding choke cone 24.
  • the choke cone 24 projects in a movable manner into the first choke bore 22 by- virtue of the choke cone 24 forming an end portion of ao spindle 28 of a nanoscrew 26.
  • the nanoscrew 26, which is of a design known per se, is arranged to be able to repeatedly move the spindle 28 in the axial direction.
  • the nanoscrew 26 is connected to the manifold 2 by means of threads 30.
  • the adjustment valve housing 8 is provided with a lid 32 connected to the adjustment valve housing 8 by means of bolt connections (not shown) . o From its portion facing the lid 32, the adjustment valve housing 8 is provided with an axial bore 34 extending inwards to a first shoulder 36. From the shoulder 36, a through-going sleeve bore 38 extends concentrically with the bore 34. The sleeve bore 38 is provided with internal threads 40. 5 A cylindrical portion 42 of the lid 32 projects in a sealing manner, by means of a gasket 44, into the bore 34. Between the cylindrical portion 42 and shoulder 36, the bore 34 forms a cylinder for a piston 46.
  • the supply pipe 10 communicates with the sideo of the piston 46 facing the lid 32.
  • the pipe connection 18 connects the first choke 4 to the sleeve bore 38.
  • the piston 46 which is arranged in a sealing and movable manner in the bore 34 by means of a seal 48, is provided with a valve body 50 in its portion facing away from the lid 32.
  • a spring or pack of springs 52 is biased between the shoulder 36 and the piston 46.
  • a valve sleeve 54 is screwed in a sealing manner, by means of a gasket 56, into the threads 40 of the sleeve bore 38.
  • the valve sleeve 54 is formed with a central, axial and through- going second choke bore 58 communicating with the outlet 60 of the adjustment valve housing 8.
  • the valve sleeve 54 cooperates with the valve body 50 so as to form the main elements of the second choke 6.
  • the relative axial position of the piston 46 thus determines the opening of the second choke 6.
  • the force exerted by the spring 52 seeks to move the piston 46 in the direction of the lid 32.
  • the pressure drop, and thereby the flow rate through the second choke 6 at a given setting of the first choke 4 substantially depends on the ratio between the spring force exerted by the spring 52 and the area of the piston 46.
  • the inflowing fluid immediately flows through the adjustment inlet 14 to the bore 34. Thereby, the piston 46 with the valve body 50 is moved relatively fast towards the valve sleeve 54 so as to close the valve body 50 against the valve sleeve 54, see fig. 3.
  • the pressure drop stabilizes across the first choke 4 by virtue of the pressure drop of the second choke 6 being readjusted automatically, as described above .
  • the pressure drop across the first choke 4 remains unchanged despite of adjusting the flow area of the first choke 4 in order to change the flow rate.
  • the nanoscrews 26 are connected each to a respective electric motor for the remote- controlled setting of the first choke 4.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Safety Valves (AREA)
  • Fluid-Driven Valves (AREA)

Abstract

A constant-flow valve assembly (1) comprising a first adjustable choke valve (4) and a second choke valve (6), in which the relative position of a movable sealing piston or diaphragm (46) determines the opening of the second choke valve (6), and in which a supply pipe (10) communicates with the first choke valve (4) and the piston or the diaphragm (46), insofar as fluid from the supply pipe (10) drives the piston or the diaphragm (46) in the closing direction of the second choke valve (6), and in which the outlet (15) of the first choke valve (4) communicates with the inlet of the second choke valve (6), and in which fluid from the outlet (15) of the first choke valve (4) drives the piston or the diaphragm (46) in the opening direction of the second choke valve (6), and in which the second choke valve (6) communicates with an outlet (60) located downstream thereof, and wherein at least one first choke valve (4) is located in a manifold (2) separated from the second choke valve (6), the outlet (15) of the first choke valve (4) being connected to the inlet (16) of the second choke valve (6) by means of a pipe connection (18).

Description

A CONSTANT-FLOW VALVE ASSEMBLY
This invention relates to a constant-flow valve assembly. More particularly, it relates to a constant-flow valve assembly comprising a first adjustable choke valve and a second choke valve, and in which the relative position of a movable, sealing piston or diaphragm determines the opening of the second choke valve, and in which a supply pipe communicates with the first choke valve and the piston or the diaphragm, insofar as fluid from the supply pipe drives the piston or the diaphragm in the closing direction of the second choke valve, and in which the outlet of the first choke valve communicates with the inlet of the second choke valve, and in which fluid from the outlet of the first choke valve drives the piston or the diaphragm in the opening direction of the second choke valve, and in which the second choke valve communicates with an outlet located downstream thereof. At least one first choke valve is located in a manifold separated from the second choke valve, the outlet of the first choke valve being connected to the inlet of the second choke valve by means of a pipe connection.
Prior art constant-flow valves are used in a number of applications to ensure that a fluid flow remains constant despite of variations occurring in, for example, the pressure, temperature or viscosity of the flowing fluid.
A known principle of operation for a constant-flow valve involves directing the flowing fluid through two chokes connected in series. The pressure drop across the first choke is kept constant by adjusting the pressure drop across the second choke relative to variations in the total pressure drop across the constant-flow valve. By virtue of this working principle, this second choke must be readjusted in order to change the flow rate of the constant-flow valve. A larger flow rate in a constant-flow valve of this type requires an increased pressure drop across the first choke. Thereby, the adjustment area becomes relatively small, for example 1:10, if a reasonable accuracy is to be maintained. Upon larger changes in the adjustment area, the constant-flow valve must be disassembled for replacement of the first choke, after which the constant-flow valve must be recalibrated.
US patent 5 494 070 describes a constant-flow valve of such a construction. The first choke is located in a movable, sealing piston, in which the input pressure of the fluid acts on one side of the piston, and a spring is biased against the opposite side of the piston. The fluid pressure exerted by the fluid having flowed through the first choke, also acts on the spring side of the piston. A valve body is connected to the piston and corresponds to a valve seat within the housing of the constant-flow valve. Collectively, the valve body and valve seat comprise the second choke.
According to US 5.494.070, the flow rate is adjusted by virtue of moving the valve body relative to the piston, whereby the second choke opens in response to an altered force exerted by the spring. NO 319627 and US 6.026.849 concern constant-flow valves, in which the chokes of the valves are arranged in adjacent housing portions.
During normal setting of prior art constant-flow valves it is necessary, as mentioned, to readjust the second choke.
Generally, this is carried out by changing the bias of the constant-flow valve's spring or pack of springs acting against the piston of the constant-flow valve. A spring of this type is fairly powerful, which requires a relatively large actuating force. This condition together with the second choke requiring readjustment, causes prior art constant-flow valves to be relatively poorly suited for remote-controlled setting.
The object of the invention is to remedy or at least reduce one or more of the disadvantages of the prior art.
The object is achieved in accordance with the invention and by virtue of the features disclosed in the following description and in the subsequent claims.
A constant-flow valve assembly in accordance with the invention comprises a first adjustable choke valve and a second choke valve, in which the relative position of a movable sealing piston or diaphragm determines the opening of the second choke valve, and in which a supply pipe communicates with the first choke valve and the piston or the diaphragm, insofar as fluid from the supply pipe drives the piston or the diaphragm in the closing direction of the second choke valve, and in which the outlet of the first choke valve communicates with the inlet of the second choke valve, and in which fluid from the outlet of the first choke valve drives the piston or the diaphragm in the opening direction of the second choke valve, the second choke valve communicating with an outlet located downstream thereof. A constant-flow valve assembly in accordance with the invention is characterized in that at least one first choke valve is located in a manifold separated from the second choke valve, the outlet of the first choke valve being connected to the inlet of the second choke valve by means of a pipe connection.
In connection with e.g. recovery of petroleum, the manifold advantageously may be located above sea level, for example in an operating panel, whereas the second choke valve is submerged. By virtue of the spindle of the first choke being motor-driven, the first choke may be set remotely. Thereby, the manifold may also be submerged.
Advantageously, a flow rate gauge is associated with the first choke valve, insofar as the fluid flow passes through the first choke valve. The flow rate gauge may be connected in a selective manner to each first choke valve, for example by means of a change over valve .
A plurality of second choke valves may be located in a joint adjustment valve housing within which each of the second choke valves is connected to its respective first choke valve .
The constant-flow valve assembly according to the invention renders possible to provide several advantageous configurations, which is possible to a very limited extent when using prior art constant-flow valves. For example, prior art constant-flow valves have a relatively large extent, thereby requiring a considerable area in a control panel. By way of comparison, a manifold provided with a plurality of first choke valves according to the invention so as to form the setting part of the valve, occupies only an insignificant area. The cooperating second choke valves, which form the adjustment part of the valve, advantageously are located at the point of consumption of the fluid flowing through the valves .
The actuating force in prior art constant-flow valves is considerable, whereas the actuating force of the first choke valve according to the invention is relatively small, whereby a relatively small motor is sufficient for carrying out remote-controlled setting.
In the following, a non-limiting example of a preferred embodiment is described and is depicted in the accompanying drawings, in which:
Figure 1 shows a constant-flow valve assembly according to the invention;
Figure 2 shows, in section, a setting part and an adjustment part when a second choke is open; and
Figure 3 shows, in section, the setting part and the adjustment part when the second choke is closed.
In the drawings, reference numeral 1 denotes a constant-flow valve assembly comprising a manifold 2 within which three first choke valves 4 are arranged and communicate with a respective one of three cooperating second choke valves 6 located each in a respective adjustment valve housing 8. The three first choke valves 4 and the three second choke valves 6 are supplied with fluid from a supply pipe 10 via a manifold inlet 12 in the manifold 2 and an adjustment inlet 14 in each of the adjustment valve housings 8, respectively. The outlet 15 of each first choke 4 is connected to the inlet 16 of its respective second choke 6 by means of a pipe connection 18. In the following, referring to fig. 2 and 3, the function of a cooperating first choke 4 and second choke 8 is explained. It is implied that the other first chokes 4 and second chokes 6 in the valve assembly 1 function in a corresponding manner.
5 An inlet bore 20 extends from the manifold inlet 12 to the first choke 4. The first choke 4 comprises a first choke bore 22 and a corresponding choke cone 24. The choke cone 24 projects in a movable manner into the first choke bore 22 by- virtue of the choke cone 24 forming an end portion of ao spindle 28 of a nanoscrew 26. The nanoscrew 26, which is of a design known per se, is arranged to be able to repeatedly move the spindle 28 in the axial direction. The nanoscrew 26 is connected to the manifold 2 by means of threads 30.
The flow area of the first choke 4 is adjusted by moving thes choke cone 24, by means of the nanoscrew 26, within the first choke bore 22.
The adjustment valve housing 8 is provided with a lid 32 connected to the adjustment valve housing 8 by means of bolt connections (not shown) . o From its portion facing the lid 32, the adjustment valve housing 8 is provided with an axial bore 34 extending inwards to a first shoulder 36. From the shoulder 36, a through-going sleeve bore 38 extends concentrically with the bore 34. The sleeve bore 38 is provided with internal threads 40. 5 A cylindrical portion 42 of the lid 32 projects in a sealing manner, by means of a gasket 44, into the bore 34. Between the cylindrical portion 42 and shoulder 36, the bore 34 forms a cylinder for a piston 46. Via the regulating inlet 14 located in the lid 32, the supply pipe 10 communicates with the sideo of the piston 46 facing the lid 32. Via the outlet 15 of the first choke 4 and the inlet 16 in the adjustment valve housing 8, the pipe connection 18 connects the first choke 4 to the sleeve bore 38.
The piston 46, which is arranged in a sealing and movable manner in the bore 34 by means of a seal 48, is provided with a valve body 50 in its portion facing away from the lid 32.
A spring or pack of springs 52 is biased between the shoulder 36 and the piston 46.
A valve sleeve 54 is screwed in a sealing manner, by means of a gasket 56, into the threads 40 of the sleeve bore 38. The valve sleeve 54 is formed with a central, axial and through- going second choke bore 58 communicating with the outlet 60 of the adjustment valve housing 8. The valve sleeve 54 cooperates with the valve body 50 so as to form the main elements of the second choke 6.
The relative axial position of the piston 46 thus determines the opening of the second choke 6.
The fluid pressure coming from the first supply pipe 10 and acting on the upstream side of the first choke 4 via the manifold inlet 12, acts on the face of the piston 46 facing the lid 32 via the adjustment inlet 14. Via the outlet 15, the pipe connection 18 and the inlet 16 as well as the sleeve bore 38, the fluid pressure on the downstream side of the first choke 4 acts, together with the force exerted by the spring 52, on the opposite side of the piston 46.
Together with the fluid pressure remaining after the pressure drop across the first choke 4, the force exerted by the spring 52 seeks to move the piston 46 in the direction of the lid 32. Thus, the pressure drop, and thereby the flow rate through the second choke 6 at a given setting of the first choke 4, substantially depends on the ratio between the spring force exerted by the spring 52 and the area of the piston 46.
When fluid is first supplied to the constant-flow valve assembly 1, see fig. 2, the piston 46 with the valve body 50 has been moved to a position against the lid 32. Thus, the second choke 6 is open.
The inflowing fluid immediately flows through the adjustment inlet 14 to the bore 34. Thereby, the piston 46 with the valve body 50 is moved relatively fast towards the valve sleeve 54 so as to close the valve body 50 against the valve sleeve 54, see fig. 3.
As fluid is flowing through the first choke 4 and further through the outlet 15, the pipe connection 18, the inlet 16 and also the sleeve bore 38, a fluid pressure builds up on the side of the piston 46 facing the valve sleeve 54. After a relatively short time, this force, together with the force exerted by the spring 52, will overcome the force exerted by the fluid pressure on the face of the piston 46 facing the lid 32 so as to move the piston 46 and the valve body 50 somewhat in the direction away from the valve sleeve 54. Fluid may now discharge through the second choke bore 58 of the valve sleeve 54 and onto the outlet 60. Thereby, the fluid pressure on the spring side of the piston 46 is reduced, and the piston 46 and valve body 50 are moved in the direction towards the valve sleeve 54.
Within a relatively short time, the pressure drop stabilizes across the first choke 4 by virtue of the pressure drop of the second choke 6 being readjusted automatically, as described above . Any changes in the total pressure drop across the first and second chokes 4, 6 resulting from e.g. a pressure change in the outlet 60, are compensated by an altered pressure drop across the second choke 6, insofar as the pressure drop across the first choke 4 is affected, in general, only by structural features of the constant-flow valve 1, as described above.
The pressure drop across the first choke 4 remains unchanged despite of adjusting the flow area of the first choke 4 in order to change the flow rate.
In another embodiment (not shown) , the nanoscrews 26 are connected each to a respective electric motor for the remote- controlled setting of the first choke 4.

Claims

C l a i m s
1. A constant-flow valve assembly (1) comprising a first adjustable choke valve (4) and a second choke valve (6), in which the relative position of a movable sealing piston or diaphragm (46) determines the opening of the second choke valve (6) , and in which a supply pipe (10) communicates with the first choke valve (4) and the piston or the diaphragm (46) , insofar as fluid from the supply pipe (10) drives the piston or the diaphragm (46) in the closing direction of the second choke valve (6) , and in which the outlet (15) of the first choke valve (4) communicates with the inlet of the second choke valve (6) , and in which fluid from the outlet (15) of the first choke valve (4) drives the piston or the diaphragm (46) in the opening direction of the second choke valve (6) , and in which the second choke valve (6) communicates with an outlet (60) located downstream thereof, c h a r a c - t e r i z e d i n that at least one first choke valve (4) is located in a manifold (2) separated from the second choke valve (6) , the outlet (15) of the first choke valve (4) being connected to the inlet (16) of the second choke valve (6) by means of a pipe connection (18) .
2. The constant-flow valve assembly (1) in accordance with claim 1, c h a r a c t e r i z e d i n that the manifold (2) is located above sea level, and wherein the second choke valve (6) is submerged.
3. The constant-flow valve assembly (1) in accordance with claim 2, c h a r a c t e r i z e d i n that the manifold (2) is submerged.
4. The constant-flow valve in accordance with claim 1, cha r a c t e r i z e d i n that a spindle (28) of the first choke (6) is motor-driven.
5. The constant-flow valve assembly (1) in accordance with claim 1, c h a r a c t e r i z e d i n that a flow rate gauge is associated with the first choke valve (4) .
6. The constant-flow valve assembly (1) in accordance with claim 1, c h a r a c t e r i z e d i n that a plurality of second choke valves (6) are located in a joint adjustment valve housing (8) .
PCT/NO2008/000168 2007-05-16 2008-05-13 A constant-flow valve assembly WO2008140327A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20072521A NO326787B1 (en) 2007-05-16 2007-05-16 Constant-flow valve Together Building
NO20072521 2007-05-16

Publications (2)

Publication Number Publication Date
WO2008140327A2 true WO2008140327A2 (en) 2008-11-20
WO2008140327A3 WO2008140327A3 (en) 2008-12-31

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WO (1) WO2008140327A2 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4462566A (en) * 1982-02-08 1984-07-31 French Bruce C Pressure compensated flow control system
US6026849A (en) * 1998-06-01 2000-02-22 Thordarson; Petur High pressure regulated flow controller
US6189564B1 (en) * 1998-08-24 2001-02-20 Amhi Corporation Metering valve

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1010592C2 (en) * 1998-11-19 1999-10-01 Cornelis Maria Kipping Flow limiter.
NO319627B1 (en) * 2003-11-17 2005-09-05 Aadnoey Bernt Sigve Constant flow valve

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4462566A (en) * 1982-02-08 1984-07-31 French Bruce C Pressure compensated flow control system
US6026849A (en) * 1998-06-01 2000-02-22 Thordarson; Petur High pressure regulated flow controller
US6189564B1 (en) * 1998-08-24 2001-02-20 Amhi Corporation Metering valve

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Publication number Publication date
NO20072521L (en) 2008-11-17
NO326787B1 (en) 2009-02-16
WO2008140327A3 (en) 2008-12-31

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