NO344697B1 - Metal-to-metal sealing valve - Google Patents
Metal-to-metal sealing valve Download PDFInfo
- Publication number
- NO344697B1 NO344697B1 NO20171559A NO20171559A NO344697B1 NO 344697 B1 NO344697 B1 NO 344697B1 NO 20171559 A NO20171559 A NO 20171559A NO 20171559 A NO20171559 A NO 20171559A NO 344697 B1 NO344697 B1 NO 344697B1
- Authority
- NO
- Norway
- Prior art keywords
- sealing surface
- needle
- main bore
- metal
- inlet port
- Prior art date
Links
- 238000007789 sealing Methods 0.000 title claims description 86
- 239000002184 metal Substances 0.000 title claims description 22
- 239000012530 fluid Substances 0.000 claims description 25
- 238000004891 communication Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 4
- 235000009854 Cucurbita moschata Nutrition 0.000 description 3
- 240000001980 Cucurbita pepo Species 0.000 description 3
- 235000009852 Cucurbita pepo Nutrition 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 235000020354 squash Nutrition 0.000 description 3
- 241000191291 Abies alba Species 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000002783 friction material Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/44—Details of seats or valve members of double-seat valves
-
- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
-
- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/42—Valve seats
-
- 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
- F16K25/00—Details relating to contact between valve members and seats
- F16K25/005—Particular materials for seats or closure elements
-
- 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
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Secondary Cells (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Description
METAL-TO-METAL SEALING VALVE
The invention relates to a valve providing metal-to-metal sealing both in its open and its closed position, sealing a pressurised fluid led to the valve, or sealing a pressurised fluid flowing through the valve, from a surrounding environment.
More specifically it relates to a valve, which due to its metal-to-metal sealing in both its open and its closed position is particularly well suited for use within areas where the valve may be exposed to excessive pressures/temperature without loss of sealing function.
Such areas may for example be the immediate surroundings of a wellhead or a christmas tree such as found in the oil and gas production industry. However, this shall not be limiting as there may be numerous other areas and applications where a process professional will find that such a valve providing metal-to-metal sealing in both operational positions is desirable.
In general, according to industry practice and several national and international regulations, codes and standards, there is a need for isolation valves in instrumented systems.
Such valves are required so that an instrument, typically a pressure-measuring instrument, may be disconnected without affecting the process it is connected to. There are several different types of instrument valves on the market and several different methods of arranging such valves with an instrument such as a block, a block and bleed, double block and bleed etc.
The needle valve (20) illustrated in Figures 6a and 6b is typical for such a valve and represents prior art referred in order to explain the drawbacks and limitations of current art. In the following the typical needle valve (20) from prior art will be referred to as the “prior-art valve (20)”.
In an example, the prior-art valve (20) is located on a petroleum production tree which is surrounded by a liquid pool fire producing core temperatures in the range of 500 °C to 1000 °C, temperatures at which synthetic gaskets/ packers break down.
In the example the prior-art valve (20) has an inlet port (P<1>) that is connected to a christmas tree producing outlet line carrying pressurized flammable fluids. Fluids shall be understood to include both liquids and gases.
The prior-art valve has a valve body (21) arranged with several bores: a fluid-inlet bore (P<1>) perpendicular to an axis (Y); a fluid-outlet bore (P<2>) perpendicular to the axis (Y); and a passage bore (B) coincident with the axis (Y) accommodating a needle (22) and associated devices used for opening and closing the fluid passage connecting the fluid-inlet bore (P<1>) and the fluid-outlet bore (P<2>).
When closing the valve, a crown nut (27) is turned clockwise and the needle (22) is pushed downward so that the needle (22) tip closes the fluid passage connecting the fluid-inlet bore (P<1>) with a cavity (C) and the fluid-outlet bore (P<2>). See Figure 6a.
Often the angle of opposing sealing surfaces differ slightly thereby concentrating the closing or sealing force on a very small surface allowing some mechanical deformation. Even though surface-roughness tolerances of sealing areas are very small, typically in the region of 1/1000 – 1/100 mm, slight mechanical deformation ensures that no leakage paths caused by excessive roughness of the sealing surfaces remain, thereby providing a gas tight seal able to withstand very high pressure (typically > 1000 MPa). Typically, the needle (22) tip will be conical with a slope of 60° relative to the axis (Y) and an opposing sealing surface will also be conical with a slope less than the tip ensuring that the tip will cut into the edge of the sealing surface.
When opening the valve (20), the crown nut (27) is turned counter-clockwise and the needle (22) is pulled upwards so that the needle (22) tip opens the fluid passage connecting the fluid-inlet bore (P<1>) with the cavity (C) and the fluid-outlet bore (P<2>).
While the valve (20) is in its open position (Figure 6b) and fluid is flowing freely from the fluidinlet bore (P<1>) to the fluid-outlet bore (P<2>), the pressurised fluid in the cavity (C) is held from escaping through the passage bore (B) to the surrounding environment (E) by the needle (22), the passage bore (B) walls and packers (23<1>, 23<2>), which seal the annulus formed between the needle (22) and the passage bore (B) walls. See Figure 6b.
The packers (23<1>, 23<2>)are typically made from synthetic materials such as PEEK, PTFE or NBR, which are subject to unacceptable mechanical degradation at temperatures above 350 °C such as may be found in a typical hydrocarbon pool fire which may rise up to 1000 – 1100 °C within five minutes of ignition.
By turning a crown (25) clockwise, a squash plate (24) exerts force on the packers (23<1>, 23<2>) leading to mechanical compression and elongation of the packers (23<1>, 23<2>) thus forming a tighter seal resilient to higher pressure.
Washers (28, 26) made of low friction material are ensuring that the crown nut (27) rotates freely unaffected by friction against the needle (22) and a castle nut (29), thus the needle (22) is not rotationally bound to the crown nut (27) in order to prevent galling when the needle (22) tip contacts the valve body (21). The castle nut (29) locks the vertical position of the needle (22) along the axis (Y) relative to the crown nut (27) and a split pin (30) rotationally locks the crown nut (29).
If the valve (20) in its open position is subject to excessive temperature and/or pressure, the packers (23<1>, 23<2>) will likely be damaged and the pressurised fluid contained within the valve cavity (C) will have free passage to escape through the annulus between the wall of the valve bore (B) and the needle (22) to the surrounding environment, potentially escalating a critical situation.
Further prior art is described in the following documents: US3620251A; US4047695A;
US2014/020909A1; and US4714237A.
The invention has for its object to remedy or to reduce at least one of the drawbacks of the prior art, or at least to provide a useful alternative to prior art. The object is achieved through features, which are specified in the description below and in the claims that follow. The invention is defined by the independent patent claims. The dependent claims define advantageous embodiments of the invention.
In a first aspect, the invention relates to an apparatus for opening and closing a fluid passage between an inlet port and an outlet port, where the inlet port is isolated from an environment through the apparatus by metal-to-metal seals both in open and closed position, the apparatus comprising:
a valve body having a cylindrical main bore with a lower and an upper main bore sealing surface; the inlet port; and the outlet port;
a needle having a needle stem and a lower end head section, the lower end head section having an upper needle sealing surface on its upper end and a lower needle sealing surface on its lower end, wherein the lower end head section has a greater diameter than the needle stem; and
a plug having an inner and an outer plug sealing surface; and a hole with a diameter smaller than the diameter of the lower end head section of the needle, the plug being arranged in the main bore and around the needle stem, so as to occupy an annular space between a wall of the main bore and the needle stem,
where:
the inlet port is fluidly connected to the main bore below the lower main bore sealing surface and the outlet port is fluidly connected to the main bore above the lower main bore sealing surface and below the inner plug sealing surface and the outer plug sealing surface; the lower main bore sealing surface and the lower needle sealing surface are configured to interact to make up a metal-to-metal seal for isolating the inlet port from being in fluid communication with the environment through the main bore;
the upper main bore sealing surface and the outer plug sealing surface are configured to interact to make up a metal-to-metal seal for isolating the inlet port and the outlet port from being in fluid communication with the environment through the main bore; and
the upper needle sealing surface and the inner plug sealing surface are configured to interact to make up a metal-to-metal seal for isolating the inlet port and the outlet port from being in fluid communication with the environment through the main bore.
The annular space between the needle and the plug may be closed off by one or more circular packers sealing the main bore from the environment while the needle is in an intermediate position, the intermediate position being a position wherein the valve is not closed and not open.
The opposing sealing surfaces may have differing angles relative to an axis running in parallel with the main bore through the apparatus. The angle relative to the axis of a minor diameter sealing surface is lower than the angle relative to the axis of a major diameter sealing surface.
Loose seals may be applied to any of the parts described.
In the following is described a preferred embodiment illustrated by the accompanying drawings, wherein:
Figure 1 Illustrates a cross-sectional representation of the apparatus in a schematic, exploded representation for identification of the apparatus parts;
Figure 2 Shows a cross-sectional view of an embodiment of the apparatus and its metal sealing surfaces;
Figure 3 Illustrates the basic valve block of the apparatus with its inlet port, its outlet port and the main bore in where a closing device is fitted seen in a closed position;
Figure 4 Illustrates the basic valve block of the apparatus with its inlet port, its outlet port and the main bore in where a closing device is fitted seen in an intermediate position;
Figure 5 Illustrates the basic valve block of the apparatus with its inlet port, its outlet port and the main bore in where a closing device is fitted seen in an open position; Figure 6a Illustrates a valve according to prior art in a closed position; and
Figure 6b Illustrates a valve according to prior art in an open position.
The apparatus A of the invention as described and illustrated (Figures 1, 2, 3, 4 and 5) provides metal-to-metal sealing in both operational positions, open and closed. The basic part of the apparatus A is a valve body 1 which can be in any shape or form. It can be a single valve or part of a block with a plurality of valves.
In the embodiment of the valve body 1, shown in Figure 1, there is an inlet port P<1>, an outlet port P<2>and a main bore B. Further there are four sealing surfaces in the valve body 1 arranged to mate with corresponding sealing surfaces of other parts of the apparatus A. The four sealing surfaces are an inlet port sealing surface S<P1>, an outlet port sealing surface S<P2>, a lower main bore sealing surface S<11>, and an upper main bore sealing surface S<31>.
The main bore B may be stepped, typically in three steps where a first step B<T>is threaded to accommodate a plug 3 and a crown 6. The second step B<C>is smooth and forms a cavity for fluid B<C>, and the third step B<P>is a narrow bore fluidly connecting the cavity B<C>in the main bore B with the inlet port P<1>.
The inlet port P<1>and the outlet port P<2>are fluidly connected through the cavity B<C>and may typically in operation be externally connected with threaded ferrules to tubes carrying the fluid.
The needle 2 consists of a single part configured with different sections where a first section 2<1>is the needle head having two sealing surfaces, a lower needle sealing surface S<12>and an upper needle sealing surface S<21>. The needle head may also bear vertical grooves to ease fluid passage during vertical movement in the cavity B<C>.
A second stem section 2<2>is smooth and fits tightly into holes in two packers 4<1>, 4<2>, which in turn fit tightly into the plug 3, forming a tight seal between the cavity B<C>and an environment E while the needle is in an intermediate position (not open and not closed).
A third stem section 2<3>fits into a crown nut 8 and is finished by a threaded fourth stem section 2<4>adapted to fit a castle nut 10 and a hole in which a split pin 11 (shown on Fig.3, 4, and 5) is inserted to rotationally lock the crown nut 10 to the needle 2.
The plug 3 (see Fig.2 for details) is threaded on its outside, so that it fits the thread B<T>in the main bore B, and has two sealing surfaces, an outer plug sealing surface S<32>on its lower outer edge, and an inner plug sealing surface S<22>on its lower inner edge.
The two packers 4<1>, 4<2>are adapted to fit tightly into the plug 3 in the annular space formed between the inner side of the plug 3 and the needle 2. The plug 3 is castellated on its upper end allowing securely tightening by use of a tool (not shown) when inserted into the main bore B.
A squash plate 5 is adapted to fit above the plug 3, with a lower section adapted to fit inside the plug 3 and exert mechanical force onto the packers 4<1>, 4<2>situated inside the plug 3 when the crown 6 is tightened in a clockwise direction.
The crown 6 is threaded on its outside to fit into the valve bore B<T>and may be adjusted rotationally around an axis Y increasing or decreasing mechanical force exerted onto the packers 4<1>, 4<2>, resulting in compression and elongation of the packers 4<1>, 4<2>subsequently increasing or reducing the pressure tightness between the needle 2 and the plug 3.
On the inside, the crown 6 is threaded to fit the crown nut 8. The crown nut 8 is adapted such that the needle 2 passes through it and is locked in position relative to the crown nut 8 by a castle nut 10 which fits the needle’s 2 threaded portion 2<4>. The castle nut 10 is held rotationally in place on the needle 2 by a split pin 11 passing through the slots in the castle nut 10 and a hole in the needle 2.
The crown nut 8 is interfaced with the castle nut 10 through a washer 9 and with the needle 2 through a washer 7 allowing free rotation of the crown nut 8 independent of the needle 2.
The needle 2 is not rotationally bound to the crown nut 8 such as to prevent galling when the lower needle sealing surface S<12>and the lower main bore sealing surface S<11>are in contact or when the upper needle sealing surface S<21>and the inner plug sealing surface S<22>are in contact.
Operation of the crown nut 8 may be by use of an ordinary tool (not shown), or a handle 12 may be placed on to the crown nut 8 to ease operation of the crown nut 8.
There are typically sealing surfaces on each connection port. The inlet port P1 has an inlet port sealing surface S<P1>and the outlet port P<2>has an outlet port sealing surface S<P2>, both suited to mate with corresponding sealing surfaces of connection ferrules (not shown) securing tubes (not shown) to each port.
The seal made from the lower main bore sealing surface S<11>and the lower needle sealing surface S<12>making contact, make up the apparatus’ A closed position seal isolating the inlet port P1 from the cavity B<C>.
The seal made by the upper needle sealing surface S<21>and the inner plug sealing surface S<22>making contact, and the seal made by the upper main bore sealing surface S<31>and the outer plug sealing surface S<32>being in contact, form the apparatus’ A first open position seal and second open position seal, respectively, isolating the inlet P1 and cavity B<C>from the surrounding environment E through the main bore B.
This feature is particularly useful in situations where there is a demand for an instrument isolation valve to be open at all times within an area subject to fire classification, for instance when continuous pressure monitoring may be required, and the valve needs to be open at all times.
In Figure 3, the apparatus is seen in a closed position. The lower needle sealing surface (S<12>) of the needle (2) can be seen connecting and forming a closed position seal with the lower main bore sealing surface (S<11>) of the valve body (1), thereby isolating the inlet port P<1>from the cavity B<C>. The closed position seal is a metal-to-metal seal.
In Figure 4, the apparatus is seen in an intermediate position. In this position, the apparatus has two seals. One seal is formed by the packers 4<1>, 4<2>. The other seal is formed by the upper main bore sealing surface (S<31>) of the valve body (1) connecting with the outer plug sealing surface (S<32>) of the plug (3). The seals formed isolates the cavity B<C>from the surrounding environment E. The seal formed by the main bore sealing surface (S<31>) and the outer plug sealing surface (S<32>) is a metal-to-metal seal, but the seal formed by the packers 4<1>, 4<2>is not metal-to-metal.
In Figure 5, the apparatus is seen in an open position. The first and second open position seals are formed, isolating the inlet port P<1>, the outlet port P2 and the cavity from the surrounding environment by forming a double seal in the main bore. Both of said seals are metal-to-metal.
The valve as presented may then be open in all situations without risk of leakage due to excessive temperature and/ or pressure caused by extraneous circumstances such as fire, without the risk of leaking potentially hazardous fluids.
The apparatus (A) fulfils this requirement by employing a gas and fluid tight metal-to-metal seal in its closed position as well as in its open position.
The valve 20, seen in Figure 6a and 6b, is a typical example of prior art. There is only one metal-to-metal sealing function which is when the valve 20 is in its closed position and the needle 22 point is in contact with the valve body 21 forming a metal-to-metal seal. When the valve 20 is in any other position the pressure from the inlet port P1 enters the cavity B<C>and is retained only by the packers 23<1>, 23<2>sealing the annular space between the valve body 21 and the needle 22. The packers 23<1>, 23<2>are held in place by a squash plate 24 and the crown 25 which may be used to adjust the mechanical force exerted onto the packers 23<1>, 23<2>. The castle nut 29 keeps the needle 22 vertically locked towards the crown nut 27 which if rotated clockwise will force the needle 22 down into a closed position and if rotated counter clockwise will pull the needle 22 up into an open position. The castle nut 29 is locked rotationally with the needle 22 by a split pin 30 passing through a hole in the needle 22 and the slots in the castle nut 29.
As the seals preventing pressurised fluid from leaking through the passage bore B and into the surrounding environment E in the valves intermediate or open positions are not metal-tometal the valve packers 23<1>, 23<2>will when exposed to excessive pressure/ temperature break down leading to leakage of fluids from the cavity B<C>through the passage bore B to the surrounding environment E.
Claims (2)
1. An apparatus (A) for opening and closing a fluid passage between an inlet port (P<1>) and an outlet port (P<2>), where the inlet port (P<1>) is isolated from an environment (E) through the apparatus (A) by metal-to-metal seals both in open and closed position, the apparatus (A) comprising:
a valve body (1) having a cylindrical main bore (B) having a lower main bore sealing surface (S<11>) and an upper main bore sealing surface (S<31>); the inlet port (P<1>); and the outlet port (P<2>);
a needle (2) having a needle stem (2<2>) and a lower end head section (2<1>), the lower end head section (2<1>) having an upper needle sealing surface (S<21>) on its upper end and a lower needle sealing surface (S<12>) on its lower end, wherein the lower end head section (2<1>) has a greater diameter than the needle stem (2<2>); and
a plug (3) having an inner plug sealing surface (S<22>) and an outer plug sealing surface (S<32>); and a hole with a diameter smaller than the diameter of the lower end head section (2<1>) of the needle (2), the plug (3) being arranged in the main bore (B) and around the needle stem (2<2>), so as to occupy an annular space between a wall of the main bore (B) and the needle stem (2<2>),
where:
the inlet port (P<1>) is fluidly connected to the main bore (B) below the lower main bore sealing surface (S<11>) and the outlet port (P<2>) is fluidly connected to the main bore (B) above the lower main bore sealing surface (S<11>) and below the inner plug sealing surface (S<22>) and the outer plug sealing surface (S<32>);
the lower main bore sealing surface (S<11>) and the lower needle sealing surface (S<12>) are configured to interact to make up a metal-to-metal seal for isolating the inlet port (P<1>) from being in fluid communication with the environment (E) through the main bore (B);
the upper main bore sealing surface (S<31>) and the outer plug sealing surface (S<32>) are configured to interact to make up a metal-to-metal seal for isolating the inlet port (P<1>) and the outlet port (P<2>) from being in fluid communication with the environment (E) through the main bore (B); and
the upper needle sealing surface (S<21>) and the inner plug sealing surface (S<22>) are configured to interact to make up a metal-to-metal seal for isolating the inlet port (P<1>) and the outlet port (P<2>) from being in fluid communication with the environment (E) through the main bore (B).
2. The apparatus (A) according to the previous claim where the annular space between the needle (2) and the plug (3) is closed off by one or more circular packers (4<1>, 4<2>) sealing the main bore (B) from the environment (E) while the needle (2) is in an intermediate position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20171559A NO344697B1 (en) | 2017-10-02 | 2017-10-02 | Metal-to-metal sealing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20171559A NO344697B1 (en) | 2017-10-02 | 2017-10-02 | Metal-to-metal sealing valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NO20171559A1 NO20171559A1 (en) | 2019-04-03 |
| NO344697B1 true NO344697B1 (en) | 2020-03-09 |
Family
ID=66429964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO20171559A NO344697B1 (en) | 2017-10-02 | 2017-10-02 | Metal-to-metal sealing valve |
Country Status (1)
| Country | Link |
|---|---|
| NO (1) | NO344697B1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3620251A (en) * | 1970-01-21 | 1971-11-16 | Duriron Co | Valves |
| US4047695A (en) * | 1975-03-28 | 1977-09-13 | Chappell Industries, Inc. | Adjustable choke |
| US4714237A (en) * | 1986-05-14 | 1987-12-22 | Whitey Co. | Soft seat for metering valve |
| US20140020909A1 (en) * | 2012-07-20 | 2014-01-23 | Cameron International Corporation | Flow control system with interchangeable actuators |
-
2017
- 2017-10-02 NO NO20171559A patent/NO344697B1/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3620251A (en) * | 1970-01-21 | 1971-11-16 | Duriron Co | Valves |
| US4047695A (en) * | 1975-03-28 | 1977-09-13 | Chappell Industries, Inc. | Adjustable choke |
| US4714237A (en) * | 1986-05-14 | 1987-12-22 | Whitey Co. | Soft seat for metering valve |
| US20140020909A1 (en) * | 2012-07-20 | 2014-01-23 | Cameron International Corporation | Flow control system with interchangeable actuators |
Also Published As
| Publication number | Publication date |
|---|---|
| NO20171559A1 (en) | 2019-04-03 |
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| Date | Code | Title | Description |
|---|---|---|---|
| CHAD | Change of the owner's name or address (par. 44 patent law, par. patentforskriften) |
Owner name: ICONIC AS, NO |