NO345461B1

NO345461B1 - A valve assembly for controlling the flow of a medium in a pipeline

Info

Publication number: NO345461B1
Application number: NO20190662A
Authority: NO
Inventors: Kjetil Aamodt; Oddvar Harboe-Wiig; Kenneth Rosén
Original assignee: Ik Norway As
Priority date: 2019-05-23
Filing date: 2019-05-23
Publication date: 2021-02-15
Also published as: NO20190662A1

Description

A VALVE ASSEMBLY FOR CONTROLLING THE FLOW OF A MEDIUM IN A PIPELINE

Introduction

The present invention relates to a valve assembly for controlling the flow of a medium in a pipeline. The valve assembly comprises a housing unit configured to be arranged between a first tubing and a second tubing of the pipeline, and an actuation unit configured to be connected to the housing unit and comprising a displaceable obstruction member. The housing unit comprises a housing body with a spacing comprising a seating for the obstruction member, a first port to the spacing, which first port is adapted to be connected to the first tubing, a second port from the spacing, which second port is adapted to be connected to the second tubing, and a control inlet to the spacing.

The present invention further relates to the housing unit, the actuation unit, a valve assembly set, a pipeline comprising the valve assembly, a respective method for constraining and opening-up the flow of a medium in a pipeline, and use of such valve assembly, housing unit, actuation unit and pipeline.

Prior art

Pipelines are used for conducting a flowable medium, such as oil and fluid from a hydrocarbon well or during various industrial processes. Some of these pipelines are in use for long duration, such as several years to decades. To control the flow of the flowable medium, the pipelines are provided with valves to control the flow the medium. Some of these valves are rarely used. For example, some valves are arranged for the mere purpose of enabling a section of the pipelines to be isolated in case of certain events, such as in the case of a leakage at the section or for purpose of maintenance at the section.

A problem is that the rarely used valves are costly to the overall cost of the pipeline in relation to the number of times the valves are used. A further problem is that the rarely used valves, when needed to be used, due to corrosion, erosion, aging, or similar during the long-time duration in the pipelines, have become inoperative and incapable to isolate the section of the pipeline.

US2014332707A1 discloses a valve with a removable valve seat.

Summary of the invention

The invention has for its object to remedy or to reduce at least one of the drawbacks of the prior art, or at least provide a useful alternative to prior art. A first object of the invention is to provide a valve assembly that is a cost-effective alternative to the rarely used valves used in a long duration used pipeline. A second object is of the invention is to provide a valve assembly with improved reliability for controlling the flow of a medium in a long duration used pipeline.

These objects are achieved by means of a valve assembly for controlling the flow of a medium in a pipeline, the valve assembly comprises

- a housing unit configured to be arranged between a first tubing and a second tubing of the pipeline, and

- an actuation unit configured to be connected to the housing unit and comprising a displaceable obstruction member,

wherein the housing unit comprises a housing body with a spacing comprising a seating for the obstruction member, a first port to the spacing, which first port is adapted to be connected to the first tubing, a second port from the spacing, which second port is adapted to be connected to the second tubing, and a control inlet to the spacing.

The valve assembly is characterised in that the valve assembly comprises a connection arrangement adapted to removably connect the actuation unit to the housing unit at the control inlet and, wherein the housing unit further comprises a removable or pivotable stop member, and the actuation unit comprises means for disengaging the stop member, wherein the housing unit is configured, in a first mode of operation of the valve assembly, to engage with and block the control inlet of the housing unit, and wherein the actuation unit is configured, in a second mode of operation of the valve assembly, to be connected to the housing unit, to disengage the stop member from the control inlet and displace the obstruction member between a first position outside the spacing, through the control inlet, and to a second position at the seating inside the spacing, while the spacing is in a pressurized state.

The housing unit is configured to be connected between the first tubing and the second tubing of the pipeline. The connection is configured for permanent location between the first and second tubing during the duration of use of the pipeline. The actuation unit is configured to be connected to the housing unit when the valve assembly is to be operated.

In the first mode of operation of the valve assembly, the stop member is engaged with and is blocking the control inlet of the housing unit. Thereby, the medium free to flow from the first port, into the spacing, and out of the second port. The stop member prevents the medium from being released out through the control inlet.

When control of the flow in the pipeline is needed, the actuation unit is connected to the housing unit at the control inlet. In the second mode of operation of the valve assembly, the stop member at the control inlet is disengaged by the means for disengaging the stop member and the obstruction member is displaced from the first position outside the spacing, through the control inlet, and to a second position at the seating inside the spacing, while the spacing is in a pressurized state.

Vice versa, in the second mode of operation of the valve assembly, the obstruction member is configured to be displaced from the second position to the first position when control of flow of the medium is to be discontinued.

In the second mode of operation of the valve assembly, the obstruction member obstructs the flow of the medium through the spacing at least in part or fully. Preferably, in order to isolate a section of a pipeline, the obstruction member obstructs the flow of the medium fully or essentially fully.

Preferably, the actuation unit is not connected to the housing unit during first mode of operation, i.e. during the inactive use of the valve assembly. However, it shall be understood, that actuation unit may be connected to the housing unit also during first mode of operation in order to enable valve assembly to be quickly set to the second mode of operation.

The valve assembly of the invention has the advantage of providing a cost-effective way of controlling the flow of a medium in a pipeline at location where flow control is rarely needed during the operation of the pipeline. The valve assembly further has the advantage of providing a valve assembly with improved reliability for controlling the flow of a medium where flow control is rarely needed during the operation of the pipeline.

The term “obstruction member” is to be understood as member configured to inserted into the spacing for the purpose of restricting the flow of the medium through the spacing.

The term ”seating” is to be understood as a prepared position of the obstruction member in the spacing of the housing unit. The seating comprises a surface configured to provide a sealing contact with the obstruction member when the obstruction member is in the second position.

The term “pressurized state” is to be understood as a pressure in the pipeline that is driving the flow of the medium in the pipeline.

According to an embodiment of the invention, the actuation unit comprises an actuation body defining a chamber and an actuation outlet from the chamber configured to be aligned with the control inlet of the housing unit when the actuation unit is connected to the housing unit.

By means of the alignment of the actuation outlet and the control inlet, the spacing of the housing body and the channel of the actuation unit are arranged in communication after the stop member has been disengaged from the control inlet.

According to an embodiment of the invention, the chamber is configured to accommodate the means for disengaging the stop member and the stop member.

The chamber has an extent and size that enable the means for disengaging the stop member and the stop member to be brought into the chamber. The chamber has the function of enabling the stop member to be disengaged from the control inlet, while the spacing is in a pressurized state.

According to an embodiment of the invention, the chamber is configured to accommodate the obstruction member and enabling the obstruction member to be displaced between the first position in the chamber, through the actuation outlet and the control inlet, into the spacing and to the second position at the seating inside the spacing, while the spacing is in a pressurized state.

The chamber has an extent and size that enables the obstruction member to be located in the channel in the first position and to be displaced from the first position to the second position at the seating inside the spacing, while the spacing is in a pressurized state. The chamber has the function of holding the obstruction member for introduction into the spacing of the housing unit subsequent to that the stop member has been disengaged from the control inlet.

According to an embodiment of the invention, the means for disengaging the stop member comprises a manipulator device configured to extend at least in part through the chamber to the stop member. The manipulator device enables remotely release of the stop member, while the activation unit is connected to the housing unit.

According to an embodiment of the invention, the manipulator device comprises a rod with engagement means for acting on the stop member, thereby enabling engagement or disengagement of the stop member with/from the control inlet.

According to an embodiment of the invention, the actuation unit comprises a passage in the actuation body and the manipulator device is configured to extend from an outside of the actuation body, through the passage, into the chamber and to engagement with the stop member. By means of the passage, the manipulator is enabled to be operated from an outside of chamber of the actuation unit.

According to an embodiment of the invention, the connection arrangement comprises a primary connection portion at the housing unit and a secondary connection portion at the actuation unit, wherein the primary connection portion and secondary connection portion are configured in cooperation to form a releasable connection of the actuation unit to the housing unit.

According to an embodiment of the invention, the connection arrangement comprises one of a bolt assembly, a screw joint assembly and a stud joint assembly. For example, the primary connection portion comprises threaded bolts attached in the housing unit and the secondary connection portion comprises a flange portion of the actuation body with openings for the bolts and threaded nuts to be engaged with the bolts.

According to an embodiment of the invention, the actuation unit comprises a pressurization inlet for enabling fluid to be introduced into the chamber for pressurizing the chamber. The pressurization inlet enables fluid to be introduced into chamber of the actuation unit. Thereby, the pressure of the chamber is controllable to the pressure of the spacing of the housing unit.

According to an embodiment of the invention, the valve assembly comprises means for introducing fluid into the chamber configured to be connected to the pressurization inlet. The means for introducing fluid into the chamber is for example a fluid container, such as a gas container or a liquid container. The gas is for example an inert gas, such as nitrogen, argon, and etcetera. The liquid is for example a liquid with the same of similar composition of the flowable medium that is conducted in the pipeline.

According to an embodiment of the invention, the valve assembly comprises a control unit configured to control the means for introduction fluid into the chamber prior to disengaging the stop member from the control inlet so that the chamber of the actuation unit is pressurized to a pressure in equilibrium or essentially in equilibrium with a pressure of the spacing of the housing unit.

The control unit is configured to control the introduction of the fluid into the chamber so that the pressure of the chamber is set into equilibrium or essentially in equilibrium with a pressure of the spacing of the housing unit. By setting the pressure of the chamber to the pressure of the spacing, the disengagement of the stop member from the control inlet is facilitated.

The control unit controls the introduction of the fluid into the chamber based on a known pressure in the spacing of the housing unit or based on information from a sensor located in the spacing or in vicinity of the spacing.

According to an embodiment of the invention, the valve assembly comprises a depressurization outlet comprising a control valve, and a control unit configured to control the control valve prior to disconnecting the actuation unit from the housing unit so that the chamber of the actuation unit is depressurized to a pressure in equilibrium or essentially in equilibrium with a pressure of the ambient environment.

The control valve enables the pressure of the chamber to be reduced to equilibrium or essentially in equilibrium with the pressure of the ambient environment. By setting the pressure of the chamber to equilibrium or essentially with the pressure of the ambient environment, the release of the actuation unit from the housing unit is facilitated.

According to an embodiment of the invention, the pressurization inlet and the depressurization outlet constituting a same opening to the chamber.

According to an embodiment of the invention, the pressurization inlet, the depressurization outlet and the means for introducing fluid into the chamber are arranged in a loop.

According to an embodiment of the invention, the stop member is configured to be brought to engagement with the control inlet prior to depressurization and disconnecting the actuation unit from the housing unit.

According to an embodiment of the invention, the actuation unit comprises a drive mechanism configured to displace the obstruction member between the first and the second position, while the spacing is in a pressurized state. The drive mechanism has the function of enabling an operator to displace the obstruction member from the first position to the second position from outside of the actuation unit.

According to an embodiment of the invention, the actuation unit comprises a guide member configured to guide the obstruction member to the control inlet. The guide member assures that the obstruction member is guided from the first position in the chamber to the control inlet and into the spacing of the housing unit.

According to an embodiment of the invention, the guide member comprises the chamber being shaped to act on the obstruction member so that it guides the obstruction member to the control inlet or the guide member comprises a guide rail configured to act on the obstruction member and guide the obstruction member to the control inlet.

According to an embodiment of the invention, the actuation unit comprises a further actuation outlet configured allow the stop member to be taken out of the chamber and a removable or pivotable further stop member at the further actuation outlet, wherein the further stop member is configured, in a third mode of operation of the valve assembly, to engage with and block the further actuation outlet, and wherein, in a fourth mode of operation of the valve assembly, the further stop member is configured to be disengaged from the further actuation outlet and the stop member is configured to be taken out of the further actuation outlet.

The further actuation outlet enables the stop member to be taken out of the chamber and replaced or repaired prior to reinserting the stop member.

According to an embodiment of the invention, the actuation unit comprises a further obstruction member configured to isolate the chamber in a first portion next to the actuation outlet and a second portion next to the further actuation outlet after that the stop member has been brought to the second portion of the chamber.

According to an embodiment of the invention, the chamber comprises a further seating for the further obstruction member defining a division between the first portion and the second portion of the chamber when the further obstruction has been brought to engagement with the further seating.

According to an embodiment of the invention, the depressurization outlet is arranged at said second portion of the chamber.

According to an embodiment of the invention, the valve assembly comprises a first sealing arrangement between the seating and the obstruction member.

According to an embodiment of the invention, the valve assembly comprises a second sealing arrangement at the control inlet configured to provide a sealing between the housing body, the stop member and the actuation body.

According to an embodiment of the invention, the valve assembly comprises a third sealing arrangement at the control inlet configured to provide a sealing between the control inlet and the actuation outlet.

According to an embodiment of the invention, the valve assembly comprises a forth sealing arrangement at the passage of the actuation unit configured to provide a sealing between the actuation body and the manipulator device at the passage.

According to an embodiment of the invention, the valve assembly comprises a fifth sealing arrangement at the further seating configured to provide a sealing between the further seating and the further obstruction member.

According to an embodiment of the invention, the actuation unit comprises a sixth sealing arrangement at the further actuation outlet configured to provide a sealing between the further actuation outlet and the further stop member.

According to an embodiment of the invention, any of the first, second, third, fourth, fifth and sixth sealing arrangement comprises a mechanical seal mainly comprising an elastomer, such as rubber.

According to an embodiment of the invention, the valve assembly comprises a fastening arrangement for removably connecting the stop member to the housing body at the control inlet.

According to an embodiment of the invention, the fastening arrangement comprises one or more bolts configured for being remotely disengaged and engaged by the means for disengaging the stop member, in particular a manipulator device as described in above embodiments.

According to an embodiment of the invention, the valve assembly comprises a further fastening arrangement for connecting the further stop member to the actuation body at the further actuation outlet.

According to an embodiment of the invention, any one of the first, second, third, fourth, fifth and sixth sealing arrangement is configured to withstand a pressure of 30 – 250 Bar, preferably 50 – 100 Bar.

According to an embodiment of the invention, the obstruction member has an elongated shape configured to block a flow of the medium through the spacing when the obstruction member is positioned at the seating.

According to an embodiment of the invention, the seating comprises a recess in the housing body configured to receive a portion of the obstruction member.

According to an embodiment of the invention, the further obstruction member has an elongated shape configured to block a flow of the medium between the first portion and the second portion of the chamber.

According to an embodiment of the invention, the further seating comprises a further recess configured to receive a portion of the further obstruction member.

The above objects of the invention are further obtained by means of a housing unit for controlling the flow of a medium in a pipeline, wherein the housing unit is configured to be arranged between a first tubing and a second tubing of the pipeline, wherein the housing unit comprises a body with a spacing comprising a seating, a first port to the spacing, which first port is adapted to be connected to the first tubing, a second port from the spacing, which second port is adapted to be connected to the second tubing, and a control inlet to the spacing.

The housing unit is characterised in that the housing unit is configured to enable an actuation unit to be removably connected to the body of the housing unit at the control inlet, thereby forming a valve assembly, wherein the housing unit comprises a removable or pivotable stop member,

wherein in a first mode of operation of the valve assembly, the stop member is configured to engage with and block the control inlet of the housing unit,

wherein in a second mode of operation of the valve assembly, the housing unit is configured to enable the actuation unit to be connected to the housing unit, to enable the stop member to be disengaged from the control inlet and enable the obstruction member to be displaced between a first position outside the spacing, through the control inlet, and to a second position at the seating inside the spacing, while the spacing is in a pressurized state.

According to embodiments of the invention, the housing unit comprises the corresponding features according to embodiments of it as described in connection to embodiments of the valve assembly above.

The above objects of the invention are further obtained by means of an actuation unit for controlling the flow of a medium in a pipeline. The actuation unit comprises a displaceable obstruction member. The actuation unit is characterised in that it is configured to enable removable connection to a housing unit, thereby forming a valve assembly,

wherein the housing unit comprises a housing body with a spacing comprising a seating, a first port to the spacing, which first port is adapted to be connected to a first tubing of the pipeline, a second port from the spacing, which second port is adapted to be connected to a second tubing of the pipeline, a control inlet to the spacing, and a removable or pivotable stop member, wherein the actuation unit comprises means for disengaging the stop member, and

wherein in a first mode of operation of the valve assembly, the actuation unit is configured to be inactive, and

wherein in a second mode of operation of the valve assembly, the actuation unit is configured to enable the connection to the housing unit, to enable the stop member to be disengaged from the control inlet and enable the obstruction member to be displaced between a first position outside the spacing, through the control inlet, and to a second position at the seating inside the spacing, while the spacing is in a pressurized state.

The term “the actuation unit is configured to be inactive” is to be understood as state in which the actuation unit is not active in controlling the flow of a medium in the pipeline or in the process of being activated in controlling the flow of a medium in the pipeline.

According to embodiments of the invention, the actuation unit comprises the corresponding features according to embodiments of it as described in connection to embodiments of the valve assembly above.

The above objects of the invention are further obtained by means of a valve assembly set comprising at least one valve assembly according to any of above embodiments, wherein the valve assembly set comprises two or more housing units and at least one actuation unit, wherein the number of housing units exceeds the number of actuation unit(s).

By means of the valve assembly set a single or a few actuation units are used for operating a larger number of housing units. Thereby, a cost-effective way of regulating the flow of a medium at a plurality of locations is provided, where regulation is rarely necessary in the operation.

The above objects of the invention are further obtained by means of a pipeline comprising a housing unit according to any of above embodiments, wherein the housing unit is connected between a first tubing and a second tubing of the pipeline so that the first port of the housing unit is connected to the first tubing and the second port of the housing unit is connected to the second tubing.

According to an embodiment of the invention, the pipeline comprises a valve assembly according to any of above embodiments.

According to an embodiment of the invention, the pipeline comprises a valve assembly set according to any of above embodiments.

The above objects of the invention are further obtained by means of a method for constraining the flow of a medium in a pipeline by means of a valve assembly according to any of above discussed embodiments.

The method comprises:

- connecting the actuation unit to the housing unit at the control inlet,

- disengaging the stop member from the control inlet, and

- displacing the obstruction member from a first position outside the spacing, through the control inlet, and into a second position at the seating inside the spacing, while the spacing is in a pressurized state.

According to an embodiment of the invention, the method comprises:

- prior to disengaging the stop member from the control inlet, pressurizing the chamber of the actuation unit to a pressure in equilibrium with or essentially in equilibrium with a pressure of the spacing of the housing unit.

According to an embodiment of the invention, the method comprises:

- disengaging the stop member from the control inlet by removing or pivoting the stop member out of the control inlet.

According to an embodiment of the invention, the method comprises: the method comprises:

- disengaging the stop member from the control inlet by using the means for disengaging the stop member to act on the stop member.

According to an embodiment of the invention, the method comprises:

- taking the stop member out from the chamber.

According to an embodiment of the invention, the method comprises:

- moving the stop member to a second portion of the chamber located next to the further actuation outlet,

- isolating the chamber into a first portion located next to the actuation outlet and said second portion,

- depressurizing said second portion of the chamber to a pressure in equilibrium with or essentially in equilibrium with a pressure of the ambient environment,

- disengaging the further stop member from the further actuation outlet, and

- taking the stop member out through the further actuation outlet.

The chamber is preferably isolated into the first portion and the second portion by displacing the further obstruction member to the further seating.

According to an embodiment of the invention, the method comprises:

- simultaneous or essentially simultaneously with moving the stop member to the second portion of the chamber, moving the insert member to the second portion of the chamber, and

- simultaneously or essentially simultaneously with taking the stop member out through the further actuation outlet, taking the insert member out through the further actuation outlet.

According to an embodiment of the invention, the method comprises:

- subsequent to taking the stop member out, introducing the obstruction member through the further actuation outlet and into the second portion of the chamber, and

- engaging the further stop member with the further actuation outlet.

According to an embodiment of the invention, the method comprises:

- subsequent to that the stop member has been taken out through the further actuation outlet, engaging the further stop member with the further actuation outlet,

- pressurizing the second portion of the chamber to a pressure in equilibrium with or essentially in equilibrium with a pressure of the first portion of the chamber, and

- merging the first portion and the second portion of the chamber.

The first portion and the second portion of the chamber are preferably merged by displacing the further obstruction member away from the further seating.

According to an embodiment of the invention, the method comprises:

subsequent to merging the first portion and the second portion of the chamber, displacing the obstruction member from a first position outside the spacing, through the control inlet, and into a second position at the seating inside the spacing, while the spacing is in a pressurized state.

The above objects of the invention are further obtained by means of a method for opening-up the flow of a medium in a pipeline by means of a valve assembly according to any of above embodiments.

The method comprises:

- displacing the obstruction member from a second position at the seating inside the spacing, through the control inlet and the actuation outlet, and to a first position in the chamber, while the spacing is in a pressurized state,

- engaging the stop member with the control inlet so that the control inlet is blocked, and - disconnecting the actuation unit from the housing unit.

According to an embodiment of the invention, the method comprises:

- engaging the stop member with the control inlet by reinserting or pivoting the stop member into the control inlet.

- engaging the stop member with the control inlet by using the means for disengaging the stop member to act on the stop member.

According to an embodiment of the invention, the method comprises:

- engaging the stop member or a replacement stop member with the control inlet by reinserting said stop member into the control inlet.

The replacement stop member may alternatively be a refurbished used stop member.

According to an embodiment of the invention, the method comprises:

- prior to disconnecting the actuation unit from the housing unit, depressurizing the chamber of the actuation unit to a pressure in equilibrium with or essentially in equilibrium with a pressure of the ambient environment.

According to an embodiment of the invention, the method comprises:

- prior to disconnecting the actuation unit from the housing unit, moving the obstruction member to a second portion of the chamber located next to the further actuation outlet, - isolating the chamber into a first portion and said second portion,

- disengaging the further stop member from the further actuation outlet,

- taking the obstruction member out through the further actuation outlet,

- introducing the stop member through the further actuation outlet and into the second portion of the chamber,

- engaging the further stop member with the further actuation outlet,

- pressurizing the second portion of the chamber to a pressure in equilibrium with a pressure of the first portion of the chamber,

- merging the first portion and the second portion of the chamber, and

- engaging the stop member with the control inlet of the housing unit.

According to an embodiment of the invention, the method comprises:

- simultaneous or essentially simultaneously with introducing the stop member, introducing the insert member into the second portion of the chamber, and

- simultaneously or essentially simultaneously with engaging the stop member with the control inlet of the housing unit, engaging the insert member with the seating of the housing unit.

Preferably, the insert member is introduced into the second portion of the chamber at the same time as the stop member is introduce. Alternatively, the insert member may be arranged in a separate set of steps.

According to an embodiment of the invention, the method comprises

- prior to introducing the stop member, introducing the insert member through the further actuation outlet and into the second portion of the chamber,

- engaging the further stop member with the further actuation outlet

- merging the first portion and the second portion of the chamber,

- engaging the inlet member with the seating of the housing unit.

The method thereafter comprises the steps of

- isolating the chamber into a first portion and said second portion,

- depressurizing said second portion of the chamber to a pressure in equilibrium with a pressure of the ambient environment, and

- disengaging the further stop member from the further actuation outlet.

Dependent on configuration of the chamber and the insert member, a separate set of steps according to above for introducing the insert member may be necessary.

The above objects of the invention are further obtained by means of use of a valve assembly according to any of above embodiments.

The above objects of the invention are further obtained by means of use of a housing unit according to any of above embodiments.

The above objects of the invention are further obtained by means of use of an actuation unit according to any of above embodiments.

The above objects of the invention are further obtained by means of use of a valve assembly set.

The above objects of the invention are further obtained by means of use of a pipeline according to any of above embodiments.

Brief description of drawings

In the following is described examples of preferred embodiments illustrated in the accompanying drawings, wherein:

Fig. 1a discloses a valve assembly according to an embodiment of the invention;

Fig. 1b discloses a valve assembly according to a further embodiment of the invention;

Fig. 2a-2g disclose steps of the operation of the valve assembly in fig.1a;

Where:

Fig. 2a discloses a housing unit of the valve assembly connected to a first tubing and a second tubing;

Fig. 2b discloses an actuation unit connected to the housing unit;

Fig. 2c discloses the valve assembly where a stop member has been disengaged from a control inlet of the housing unit;

Fig. 2d discloses the valve assembly where the stop member has been brought to a second portion of a chamber of the actuation unit and the second portion of the chamber has been isolated from a first portion of the chamber; Fig. 2e discloses the valve assembly where the stop member has been removed out of the chamber through a further actuation outlet and an obstruction member has been inserted into the second portion of the chamber;

Fig. 2f discloses the valve assembly where the obstruction member is being displaced from a first position inside the chamber to a second position inside the spacing of the housing unit;

Fig. 2g discloses the valve assembly where an obstruction member has been arranged at a seating in the second position inside the spacing of the housing unit;

Fig. 3 discloses a flow chart of a method for controlling the flow of a medium in a pipeline according to an embodiment of the invention;

Fig. 4 discloses a flow chart of a method for controlling the flow of a medium in a pipeline according to a further embodiment of the invention;

Fig. 5 discloses a flow chart of a method for controlling the flow of a medium in a pipeline according to a yet another embodiment of the invention;

Fig. 6 discloses a flow chart of a method for controlling the flow of a medium in a pipeline according to a yet another embodiment of the invention;

Fig. 7 discloses a flow chart of a method for or opening-up the flow of a medium in a pipeline according to an embodiment of the invention;

Fig. 8 discloses a flow chart of a method for or opening-up the flow of a medium in a pipeline according to a further embodiment of the invention;

Fig. 9 discloses a flow chart of a method for or opening-up the flow of a medium in a pipeline according to yet another embodiment of the invention; and

Fig. 10 discloses a flow chart of a method for or opening-up the flow of a medium in a pipeline according to yet another embodiment of the invention.

Detailed description

In fig.1a is a valve assembly 1 for controlling the flow of a medium in a pipeline 3 according to an embodiment of the invention disclosed. The valve assembly 1 is disclosed connected to the pipeline 3 between a first tubing 5 and a second tubing 7. In fig.1a, is only short pieces of the first tubing 5 and the second tubing 7 are shown. The valve assembly 1 is configured to replace rarely operated control valves in prior art pipelines.

In fig.1a, the valve assembly 1 is disclosed in a fictive state for the purpose of disclosing as many features of the valve assembly 1 as possible. While the fictive state being a possible state, it not a normal state in the operation of the valve assembly 1. The actual states in the operation of the valve assembly 1 are shown in fig.2a-2g.

The valve assembly 1 comprises a housing unit 10 and an actuation unit 20. The housing unit 10 is configured to be connected between the first tubing 5 and the second tubing 7 of the pipeline 3. The actuation unit 20 is configured to be connected to the housing unit 10 and comprises a displaceable obstruction member 25 for controlling the flow of the medium.

The housing unit 10 comprises a housing body 30 with a spacing 32 comprising a seating 35 for supporting the obstruction member 25 in the spacing 32, a first port 40 to the spacing 32, a second port 42 from the spacing 32, and a control inlet 45 to the spacing 32. The housing body 30 mainly comprises a form stable and durable construction material, such as steel, stainless steel, aluminum, and etcetera.

The seating 35 provides a defined position for the obstruction member 25 in the spacing 32. The seating 35 has a form configured to receive the obstruction member 25 and a surface configured for providing a sealing to the obstruction member 25. The seating 35 is for example in the form of a groove in the housing body 30.

The valve assembly 1 comprises a first sealing arrangement 36 between the seating 35 and the obstruction member 25. In the disclosed embodiment, the first sealing arrangement 36 is attached to the obstruction member 25. The first sealing arrangement 36 is configured to improve the contact between the obstruction member 25 and the seating 35 for controlling the flow of the medium in the pipeline 3. The first sealing arrangement 36 comprises for example a mechanical seal mainly comprising an elastomer, such as rubber.

In a further embodiment of the invention in fig.1b, the valve assembly 1 differs from the embodiment in fig.1a, in that the housing unit 10 comprises a removable insert member 38 configured to protect the seating 35. The insert member 38 has the advantage of assuring the quality and integrity of the surface of the seating 35.

The insert member 38 has a form shaped in conformity to the seating 35. For example, in the embodiment where the seating 35 is in the form of groove, the insert member 38 has a shape configured to fill the grove at least in part, preferably in full. Preferably, the insert member 38 has a form, which when arranged in the seating 35, provides a smooth transition between the housing body 30 and the seating 35. Thereby, turbulent flow of the medium in the spacing 32 of the housing unit 10 is prevented while the seating 35 is protected.

The insert member 38 comprises mainly a corrosive and erosive durable material, such as steel, stainless steel, aluminum, or a suitable polymeric material therefore. The insert member 38 may comprise one or more pieces that jointly protect the seating 35.

It shall be understood that the insert member 38 is an optional feature. The insert member 38 is in particular beneficial for a pipeline 3 conducting a corrosive of or erosive medium, or for long duration use.

As shown in fig.2a, the housing unit 10 is connected between the first tubing 5 and the second tubing 7 by means of that the first port 40 is connected to the first tubing 5 and the second port 42 is connected to the second tubing 7. The housing unit 10 is configured to be permanently arranged between the first tubing 5 and second tubing 7 during the use of the pipeline 3. For example, the first port 40 and second port 42 are welded to the ends of respective first tubing 5 and second tubing 7. Thereby, control of the flow of the medium in the pipeline 3 at the position of the housing unit 10 has been prepared, as will be explained in the following.

The housing unit 10 comprises a removable or pivotable stop member 50. The stop member 50 is configured, in a first mode of operation of the valve assembly 1 as shown in fig.

2a, to engage with and block the control inlet 45 of the housing unit 10. Thereby, the flowable medium within the pipeline 3 is prevented from being discharged through the control inlet 45. In the disclosed embodiment of the invention in fig.1b, in the first mode of operation of the valve assembly 1, the removable insert member 38 is arranged in the spacing 32 so that the seating 35 is protected from corrosion and erosion.

The valve assembly 1 comprises a connection arrangement 55 adapted to removably connect the actuation unit 20 to the housing unit 10 at the control inlet 45. The connection arrangement 55 is for example a bolt assembly.

The valve assembly 1 further comprises a fastening arrangement 56 for removably connecting the stop member 50 to the housing body 30 at the control inlet 70. The fastening arrangement 56 is for example a bolt assembly. The actuation unit 20 comprises means for disengaging the stop member 50, such as a manipulator device 58. For example, the fastening arrangement 56 comprises bolts configured to be remotely disengaged and engaged by the means for disengaging the stop member 50.

The actuation unit 20 is configured, in a second mode of operation of the valve assembly 1, to disengage the stop member 50 from the control inlet 45 by applying the means for disengaging the stop member 50, and thereafter displacing the obstruction member 25 between a first position outside the spacing 32, through the control inlet 45, and to a second position at the seating 35 inside the spacing 32, while the spacing 32 is in a pressurized state.

In the disclosed embodiment of the invention in fig.2g, in the second mode of operation of the valve assembly 1, the removable insert member 38 has been removed from the housing unit 10 prior to displacement of the obstruction member 25 between the first and the second position. Thereby, the seating 35 has been prepared to receive the obstruction member 25. Preferably, the insert member 38 is connected to the stop member 50, thereby enabling the stop member 50 and the insert member 38 to be jointly removed from the housing unit 10.

The first mode of operation relates to a mode where the valve assembly 1 is inactive in controlling the flow of the medium in the pipeline 3. In the first mode of operation, the medium is allowed to flow from the first tubing 5 into the first port 40 and into the spacing 32, and thereafter out of the second port 42 and into the second tubing 7. The first mode of operation of the valve assembly 1 constitutes the main mode of operation during the operation of the valve assembly 1.

Preferably, in the first mode of operation of the valve assembly 1, the actuation unit 20 is disconnected from the housing unit 10 and is located at a separate location from the housing unit 10, such as in a storage facility.

The actuation unit 20 comprises an actuation body 60 comprising a chamber 62 configured to accommodate the stop member 50 after being disengaged from the control valve and configured to accommodate and facilitating the displacement of the obstruction member 25 between the first and the second position. The actuation body 60 mainly comprises a form stable and durable construction material, such as steel, stainless steel, aluminum, and etcetera.

The second mode of operation of the valve assembly 1 relates to a mode where the valve assembly 1 is active or about to be activated in controlling the flow of the medium in the pipeline 3. In the second mode of operation of the valve assembly 1, the actuation unit 20 is connected to the housing unit 10 and the stop member 50 has been or is in the progress of being disengaged from the control inlet 45, thereby allowing the obstruction member 25 to be displaced between the first position in the chamber 62 and the second position at the seating 35 inside the spacing 32.

Preferably, the actuation unit 20 comprises a drive mechanism 64 for inducing the displacement of the obstruction member 25 between the first and the second position. The drive mechanism 64 comprises for example a hydraulic cylinder 68 and hydraulic drive unit 66.

The actuation unit 20 comprises an actuation outlet 70 from the chamber 62 configured to be aligned with the control inlet 45 of the housing unit 10 when the actuation unit 20 is connected to the housing unit 10. The actuation outlet 70 is configured to allow the obstruction member 25 to pass to the control inlet 45 and into the spacing 32 of the housing unit 10.

The actuation unit 20 comprises a pressurization inlet 72 for enabling fluid to be introduced into the chamber 62 for pressurizing the chamber 62. The actuation unit 20 further comprises means for introducing fluid into the chamber 62, such as a container 74 connected to a pump unit. The fluid is preferable the same or corresponding to the medium being conducted in the pipeline 3. In case of introduction of a gas, preferably, an inert gas is introduced, such as nitrogen, argon, and etcetera.

Preferably, the valve assembly 1 comprises a control unit 80 configured to control the means for introduction fluid into the chamber 62 so that the chamber 62 of the actuation unit 20 is pressurized to a pressure in equilibrium with or approximately in equilibrium with a pressure of the spacing 32 of the housing unit 10 prior to disengaging the stop member 50 from the control inlet 45.

The control unit 80 is configured to control the introduction of the fluid into the chamber 62 based on a known pressure in the spacing 32 of the housing unit 10. Alternatively, the valve assembly 1 comprises a sensor device at the spacing 32 or vicinity of the spacing 32. The sensor device is configured to provide information to the control unit 80.

According to an embodiment of the invention, the valve assembly 1 comprises a further sensor device at the chamber 62 of the actuation unit 20 configured to provide information to the control unit 80. By means of the further sensor device, the control unit 80 is configured to confirm that the pressure in the chamber 62 has been pressurized to a pressure in equilibrium with or approximately in equilibrium with a pressure of the spacing 32 of the housing unit 10 prior to disengaging the stop member 50 from the control inlet 45.

The valve assembly 1 further comprises a depressurization outlet 90 provided with a control valve 92. The control unit 80 is configured to control the control valve 92 so that the chamber 62 of the actuation unit 20 is depressurized to a pressure in equilibrium or essentially in equilibrium with a pressure of the ambient environment prior to detaching the actuation unit 20 from the housing unit 10. The actuation unit 20 is detached from the housing unit 10 by means of disconnecting the connection arrangement 55. In the case where the connection arrangement 55 is a bolt assembly, the actuation unit 20 is detached by releasing the bolts of the bolt assembly.

In the disclosed embodiment, the actuation unit 20 comprises a further actuation outlet 100 and a further stop member 102. The further actuation outlet 100 has the function of enabling removal of the stop member 50 and possible insert member 38 from the chamber 62.

The valve assembly 1 further comprises a further fastening arrangement 95 for removably connecting the further stop member 50 to the actuation body at the actuation outlet 100. The further fastening arrangement 95 is for example a bolt assembly.

In a third mode of operation of the valve assembly 1, the further stop member 102 is engaged with the further actuation outlet 100. Thereby, closing the further actuation outlet 100 enabling the chamber 62 to be pressurized. In a fourth mode of operation of the valve assembly 1, the further stop member 102 is disengaged from the further actuation outlet 100. Thereby, allowing the stop member 50 to be removed out and possible insert member 38 of the chamber 62 through the further actuation outlet 100 and correspondingly reintroduced through the further actuation outlet 100 and into the chamber 62.

In the disclosed embodiment, the actuation unit 20 comprises a further obstruction member 110 and further seating 112 for the further obstruction member 110 in the actuation body. The further obstruction member 110 is configured to isolate the chamber 62 in a first portion 120 next to the actuation outlet and a second portion 122 next to the further actuation outlet 100. The further obstruction member 110 has the function of separating the chamber 62 in the two portions after that the stop member 50 has been brought to the second portion 122 of the chamber 62. Thereby, enabling the stop member 50 to be be removed from the chamber 62 and correspondingly reintroduced into the chamber 62 without leakage of the medium in the pipeline 3. In the disclosed embodiment, the pressurization inlet 72 and the depressurization outlet 90 are arranged in the second portion 122 of the chamber 62.

Preferably, the actuation unit 20 comprises a further drive mechanism 130 for inducing the displacement of the further obstruction member 110. The further drive mechanism 130 comprises for example a hydraulic cylinder and hydraulic drive unit (not disclosed in detail).

The control unit 80 is configured to control the drive mechanism 64 and the further drive mechanism 130 in the operation of the valve assembly.

The configuration of actuation unit 20 with the further actuation outlet 100 has the advantage of allowing the stop member 50 to be taken out and inspected before being introduced again into the chamber 62 for engaging with the control inlet 45 of the housing unit 10. The configuration has further the advantage of allowing a replacement stop member 50 or alternatively a refurbished used stop member 50 to be introduced into the chamber 62. Accordingly, subsequent to operation of the valve assembly 1, it is assured that the valve assembly 1 is restored to the first mode of operation where stop member 50 accurately is engaging with the control valve 92 without leakage of the medium in the pipeline 3.

In fig.3 is a flow chart of method for controlling the flow of a medium in a pipeline 3 according to an embodiment of the invention disclosed. The method is executed by means of a valve assembly 1 as discussed above in connection to the figures or in embodiments in connection to the section summary of the invention.

The method originates from a state in which the housing unit 10 is connected between the first tubing 5 and the second tubing 7 of the pipeline 3, see fig.2a.

In a step 210, the method is initiated by connecting the actuation unit 20 to the housing unit 10 at the control inlet 45, see fig.2b. Thereby, the actuation outlet 70 of the actuation unit 20 is aligned with the control inlet 45 of the housing unit 10.

In a step 220, the method comprises disengaging the stop member 50 from the control inlet 45, see fig.2c. The stop member 50 is disengaged from the control inlet 45 by the means for disengaging the stop member 50, such as a manipulator device. In the event that the housing unit 10 is provided with a removable insert member 38, the insert member 38 is removed from the seating 35 of the housing unit 10 in connection with disengaging the stop member 50 from the control inlet 45.

In a step 230, the method comprises displacing the obstruction member 25 from a first position outside the spacing 32, through the control inlet 45, and into a second position at the seating 35 inside the spacing 32, while the spacing 32 is in a pressurized state, see fig. 2g. In particular, the obstruction member 25 is displace from the first position in the chamber 62 to the second position at the seating 35. The displacement of the obstruction member 25 from the first position to the second position is done while the spacing 32 in a pressurized state.

In the process of displacing the obstruction member 25, the step 230 preferably further comprises guiding the displacement of the obstruction member 25 between first and second position. The displacement is preferably induced by means of a drive mechanism 64.

In fig.4 is a flow chart of method for controlling the flow of a medium in a pipeline 3 according to a further embodiment of the invention disclosed. The method in fig.4 differs from the method in fig.3 in that it further comprises the following steps:

In a step 215 prior to disengaging the stop member 50 from the control inlet 45, pressurizing the chamber 62 of the actuation unit 20 to a pressure in equilibrium or essentially in equilibrium to a pressure of the spacing 32 of the housing unit 10. By pressurizing to the pressure of the spacing 32 of the housing unit 10, the disengagement of the stop member 50 is facilitated. In case of large pressure difference between the spacing 32 and the ambient pressure, the step of pressurizing the chamber 62 to a pressure in equilibrium or essentially in equilibrium to a pressure of the spacing 32 is essential for disengaging the stop member 50.

In fig.5 is a flow chart of method for controlling the flow of a medium in a pipeline 3 according to yet another embodiment of the invention disclosed.

The method in fig.5 differs from the method in fig.4 in that it further comprises the following steps:

In a step 221, the method comprises moving the stop member 50 to a second portion 122 of the chamber 62 located next to the further actuation outlet 100. The step of moving the stop member 50 is for example done by the means for disengaging the stop member 50, such as a manipulator device.

In a step 222, the method comprises isolating the chamber 62 into a first portion 120 located next to the actuation outlet and a second portion located next to the further actuation outlet 100, see fig.2d. The step comprises for example displacing the further obstruction member 110 to the further seating 112.

In a step 223, the method comprises depressurizing the second portion 122 of the chamber 62 to a pressure in equilibrium with a pressure of the ambient environment. The step comprises for example opening the control valve 92 at the depressurization outlet 90.

In a step 224, the method comprises disengaging the further stop member 102 from the further actuation outlet 100, and in a step 225, taking the stop member 50 out through the further actuation outlet 100.

The separation of the chamber 62 in the first portion 120 and second portion 122 enables the stop member 50 to be taken out of the chamber 62. Subsequently, the stop member 50 may be inspected and refurbished or replaced with a replacement stop member 50.

In a step 226 subsequent to taking the stop member 50 out, the method comprises introducing the obstruction member 25 through the further actuation outlet 100 and into the second portion 122 of the chamber 62, and in a step 227, engaging the further stop member 102 with the further actuation outlet 100, see fig.2e.

In a step 228, the method comprises pressurizing the second portion 122 of the chamber 62 to a pressure in equilibrium with a pressure of the first portion 120 of the chamber 62. The step comprises introducing fluid through the pressurization inlet.

In a step 229, the method comprising merging the first portion 120 and the second portion 122 of the chamber 62. The step comprises displacing the further obstruction member 110 from the fourth position at the further seating 112 to the third position.

The step 226 to 229 enables the obstruction member 25 to be introduced into the chamber 62 after the stop member 50 has been taken out of the chamber 62. The steps have the advantage of enabling a compact design on the chamber 62.

In fig.6 is a flow chart of method for controlling the flow of a medium in a pipeline 3 according to yet another embodiment of the invention disclosed.

The method in fig.6 differs from the method in fig.5 in that it further comprises the following steps or following complementary steps:

In the case where an insert member 38 is applicable, in a step 221a, the method comprises simultaneously or essentially simultaneously moving the stop member 50 and the insert member 38 to the second portion 122 of the chamber 62 located next to the further actuation outlet 100. In a step 225a, the method comprises simultaneous or essentially simultaneously taking the stop member 50 and the insert member 38 out through the further actuation outlet 100.

Preferably, the insert member 38 is moved to the second portion 122 of the chamber 62 at the same time as the stop member 50. Alternatively, the insert member 38 may be removed from the chamber 62 in a separate set of steps of moving the insert member 38 to the second portion 122 of the chamber 62, isolating the chamber 62 in the two portions, disengaging the further stop member 102 and taking out the insert member 38 from the second portion of the chamber 62.

In fig.7 is a method for opening-up the flow of a medium in a pipeline 3 according to an embodiment of the invention. The method for opening-up the flow of a medium in a pipeline 3 comprises the reverse steps of the method of for controlling the flow of a medium in the pipeline 3 as discussed in view of fig.3-6 and fig.2a-2g. The method is executed by means of a valve assembly 1 as discussed above in connection to the figures or in embodiments in connection to the section summary of the invention.

In a step 310, the method is initiated by displacing the obstruction member 25 from a second position at the seating 35 inside the spacing 32, through the control inlet 45 and the actuation outlet 70, and to a first position in the chamber 62, while the spacing 32 is in a pressurized state.

In the process of displacing the obstruction member 25, the step 310 preferably further comprises guiding the obstruction member 25 from the second position to the first position. The displacement is preferably induced by means of the drive mechanism 64.

In a step 350, the method comprises engaging the stop member 50 with the control inlet 45 so that the control inlet 45 is blocked. The step 350 preferably comprises engaging the stop member 50 or a replacement stop member 50 with the control inlet 45 by reinserting the stop member 50 into the control inlet 45. By means of step 350, the valve assembly 1 is set into the first mode of operation.

In a step 360, the method comprises disconnecting the actuation unit 20 from the housing unit 10. The step 360 involves disengaging the connection arrangement 55. In the embodiment where the connection arrangement 55 comprises a bolt assembly, the step 360 involves releasing the bolts of the bolt assembly.

In fig.8 is a method for constraining the flow of a medium in a pipeline 3 disclosed according to a further embodiment of the invention. The method in fig.7 differs from the method in fig.7 in that it further comprises the following step:

In a step 355 prior to disconnecting the actuation unit 20 from the housing unit 10, the method comprises depressurizing the chamber 62 of the actuation unit 20 to a pressure in equilibrium with a pressure of the ambient environment. The depressurizing of the chamber 62 is for example done by opening the control valve 92 at the depressurization outlet 90.

By depressurizing the chamber 62 to the pressure of the ambient environment, the removal of the actuation unit 20 is facilitated. In case of large pressure difference between the chamber 62 and the ambient pressure, the step of depressurizing the chamber 62 to a pressure in equilibrium or essentially in equilibrium with the ambient pressure is essential for disengaging the stop member 50.

In fig.9 is a method for constraining the flow of a medium in a pipeline 3 disclosed according to yet another embodiment of the invention. The method in fig.9 differs from the method in fig.8 in that it further comprises the following steps:

In a step 315, the method comprises moving the obstruction member 25 to a second portion 122 of the chamber 62 located next to the further actuation outlet 100. By moving the obstruction member 25 to the second portion 122 of the chamber 62, the obstruction member 25 is prepared for enabling removal from the chamber 62.

In a step 320, the method comprises isolating the chamber 62 into a first portion 120 and the second portion 122. The isolation is for example achieved by means of displacing the further obstruction member 110 to the further seating 112. In a step 322, the method comprises depressurizing the second portion 122 of the chamber 62 to a pressure in equilibrium with or essentially in equilibrium with a pressure of the ambient environment. In a step 324, the method comprises disengaging the further stop member 102 from the further actuation outlet 100. In a step 326, the method comprises taking the obstruction member 25 out through the further actuation outlet 100.

By means of step 320 and 322, the second portion 122 of the chamber 62 is prepared for being opened up. In step 324, the second portion 122 of the chamber 62 is opened up by disengaging the further stop member 102.

In a step 340, the method comprises introducing the stop member 50 through the further actuation outlet 100 and into the second portion 122 of the chamber 62. In a step 342, the method comprises engaging the further stop member 102 with the further actuation outlet 100, and in a step 344, the method comprises pressurizing the second portion 122 of the chamber 62 to a pressure in equilibrium with a pressure of the first portion 120 of the chamber 62. In a step 346, the method comprises merging the first portion 120 and the second portion 122 of the chamber 62.

By the steps 342 and 344, the second portion 122 of the chamber 62 is prepared for being merged with the first portion 120 of the chamber 62. Step 346 of merging the first portion 120 and the second portion 122 of the chamber 62 is for example done by displacing the further obstruction member 110 so that the isolation between the first portion 120 and second portion 122 of the chamber 62 is removed. Thereafter, the method comprises the step 350 of engaging the stop member 50 with the control inlet 45 of the housing unit 10, and the step 360 of disconnecting the actuation unit 20.

In fig.10 is a method for constraining the flow of a medium in a pipeline 3 disclosed according to yet another embodiment of the invention. The method in fig.10 differs from the method in fig.9 in that it further comprises the following complementary steps:

In the case where an insert member 38 is applicable, in a step 340a, the method comprises simultaneous or essentially simultaneously with introducing the stop member 50, introducing the insert member 38 into the second portion 122 of the chamber 62.

In a step 360a, the method comprises simultaneously or essentially simultaneously with engaging the stop member 50 with the control inlet 45 of the housing unit 10, engaging the insert member 38 with the seating 35 of the housing unit 10.

Preferably, the insert member 38 is introduced into the second portion 122 of the chamber 62 at the same time as the stop member 50 is introduce. Alternatively, the insert member 38 may be arranged in a separate set of steps opening up and introducing the insert member 38, and thereafter introducing the insert member 38 into the seating 35 of the housing unit 10 corresponding to the steps of introducing the stop member 50.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. Use of the verb "comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims

1. A valve assembly (1) for controlling the flow of a medium in a pipeline (3), the valve assembly (1) comprising

a housing unit (10) configured to be arranged between a first tubing (5) and a second tubing (7) of the pipeline (3), and

an actuation unit (20) configured to be connected to the housing unit (10) and comprising a displaceable obstruction member (25),

wherein the housing unit (10) comprises a housing body (30) with a spacing (32) comprising a seating (35) for the obstruction member (25), a first port (40) to the spacing (32), which first port (40) is adapted to be connected to the first tubing (5), a second port (42) from the spacing (32), which second port (42) is adapted to be connected to the second tubing (7), and a control inlet (45) to the spacing (32),

c h a r a c t e r i s e d i n that

wherein the valve assembly (1) comprises a connection arrangement (55) adapted to removably connect the actuation unit (20) to the housing unit (10) at the control inlet (45) and,

wherein the housing unit (10) further comprises a removable or pivotable stop member (50), and the actuation unit (20) comprises means for disengaging the stop member (50),

wherein the housing unit is configured, in a first mode of operation of the valve assembly (1), to engage with and block the control inlet (45) of the housing unit (10),

wherein the actuation unit (20) is configured, in a second mode of operation of the valve assembly (1), to be connected to the housing unit (10), to disengage the stop member (50) from the control inlet (45) and displace the obstruction member (25) between a first position outside the spacing (32), through the control inlet (45), and to a second position at the seating (35) inside the spacing (32), while the spacing (32) is in a pressurized state.

2. The valve assembly (1) according to claim 1, wherein the actuation unit (20) comprises an actuation body (60) defining a chamber (62) and an actuation outlet (70) from the chamber (62) configured to be aligned with the control inlet (45) of the housing unit (10) when the actuation unit (20) is connected to the housing unit (10), wherein said chamber (62) is configured to accommodate the means for disengaging the stop member and the stop member (50).

3. The valve assembly (1) according to claim 2, wherein said chamber (62) is configured to accommodate the obstruction member (25) and enabling the obstruction member (25) to be displaced between the first position in the chamber (62), through the actuation outlet (70) and the control inlet (45), into the spacing (32) and to the second position at the seating (35) inside the spacing (32), while the spacing (32) is in a pressurized state.

4. The valve assembly (1) according to any of the preceding claims, wherein the means for disengaging the stop member comprises a manipulator device (58) configured to extend at least in part or through the chamber (62) to the stop member (50) wherein the manipulator device (58) comprises a rod with engagement means for acting on the stop member (50).

5. The valve assembly (1) according to any of the preceding claims, wherein the actuation unit (20) comprises a pressurization inlet (72) for enabling fluid to be introduced into the chamber (62) for pressurizing the chamber (62), and means for introducing fluid into the chamber (62) configured to be connected to the pressurization inlet (72).

6. The valve assembly (1) according to claim 5, wherein the valve assembly (1) comprises a control unit (80) configured to control the means for introduction fluid into the chamber (62) prior to disengaging the stop member (50) so that the chamber (62) of the actuation unit (20) is pressurized to a pressure in equilibrium with a pressure of the spacing (32) of the housing unit (10).

7. The valve assembly (1) according to any of the preceding claims, further comprising a depressurization outlet (90) comprising a control valve (92), and a control unit (80) configured to control the control valve (92) prior to disconnecting the actuation unit (20) from the housing unit (10) so that the chamber (62) of the actuation unit (20) is depressurized to a pressure in equilibrium with a pressure of the ambient environment.

8. The valve assembly (1) according to any of the previous claims, wherein the housing unit (10) comprises a removable insert member (38) configured, in the first mode of operation of the valve, to be arranged at the spacing (32) so that said seating (35) is protected and configured, in the second mode of operation of the valve to be removed from the housing unit (10) prior to displacement of the obstruction member (25) between the first and the second position.

9. The valve assembly (1) according to claim 8, wherein the insert member (38) is connected to the stop member (50) enabling the stop member (50) and the insert member (38) to be jointly removed from the housing unit (10).

10. The valve assembly (1) according to any of claims 2 to 9, wherein the actuation unit (20) comprises a further actuation outlet (100) configured to allow the stop member (50) to be taken out of the chamber (62) and a removable or pivotable further stop member (102) at the further actuation outlet (100), wherein the further stop member (102) is configured, in a third mode of operation of the valve assembly (1), to engage with and block the further actuation outlet (100), and wherein, in a fourth mode of operation of the valve assembly, the further stop member (102) is configured to be disengaged from the further actuation outlet (100) and the stop member (50) is configured to be taken out of the further actuation outlet (100).

11. The valve assembly (1) according to claim 10, wherein the actuation unit (20) comprises a further obstruction member (110) configured to isolate the chamber (62) in a first portion (120) next to the actuation outlet (70) and a second portion (122) next to the further actuation outlet (100) after the stop member (50) has been brought to the second portion (122) of the chamber (62).

12. The valve assembly (1) according to claim 11, wherein the chamber (62) comprises a further seating (35) for the further obstruction member (110) defining a division between the first portion (120) and the second portion (122) of the chamber (62) when the further obstruction has been in the further seating (35).

13. A housing unit (10) for use in controlling the flow of a medium in a pipeline (3), wherein the housing unit (10) is configured to be arranged between a first tubing (5) and a second tubing (7) of the pipeline (3), wherein the housing unit (10) comprises a housing body (30) with a spacing (32) comprising a seating (35), a first port (40) to the spacing (32), which first port (40) is adapted to be connected to the first tubing (5), a second port (42) from the spacing (32), which second port (42) is adapted to be connected to the second tubing (7), and a control inlet (45) to the spacing (32),

c h a r a c t e r i s e d i n that

the housing unit (10) is configured to enable an actuation unit (20) to be removably connected to the body of the housing unit (10) at the control inlet (45), thereby forming a valve assembly (1), wherein the housing unit (10) comprises a removable or pivotable stop member (50),

wherein in a first mode of operation of the valve assembly (1), the stop member (50) is configured to engage with and block the control inlet (45) of the housing unit (10),

wherein in a second mode of operation of the valve assembly (1), the housing unit (10) is configured to enable the actuation unit (20) to be connected to the housing unit, to enable the stop member (50) to be disengaged from the control inlet (45) and enable the obstruction member (25) to be displaced between a first position outside the spacing (32), through the control inlet (45), and to a second position at the seating (35) inside the spacing (32), while the spacing (32) is in a pressurized state.

14. An actuation unit (20) for use in controlling the flow of a medium in a pipeline (3), the actuation unit (20) comprises a displaceable obstruction member (25), c h a r a c t e r i s e d i n that

the actuation unit (20) is configured to enable removable connection to a housing unit (10), thereby forming a valve assembly (1),

wherein the housing unit (10) comprises a housing body (30) with a spacing (32) comprising a seating (35), a first port (40) to the spacing (32), which first port (40) is adapted to be connected to a first tubing (5) of the pipeline (3), a second port (42) from the spacing (32), which second port (42) is adapted to be connected to a second tubing (7) of the pipeline (3), a control inlet (45) to the spacing (32), and a removable or pivotable stop member (50), wherein the actuation unit (20) comprises means for disengaging the stop member (50), and

wherein in a first mode of operation of the valve assembly (1), the actuation unit (20) is configured to be inactive, and

wherein in a second mode of operation of the valve assembly (1), the actuation unit (20) is configured to enable the connection to the housing unit (10), to enable the stop member (50) to be disengaged from the control inlet (45) and enable the obstruction member (25) to be displaced between a first position outside the spacing (32), through the control inlet (45), and to a second position at the seating (35) inside the spacing (32), while the spacing (32) is in a pressurized state.

15. A valve assembly set comprising at least one valve assembly (1) according to any of claims 1 to 12, wherein the valve assembly set comprises two or more housing units (10) and at least one actuation unit (20), wherein the number of housing units (10) exceeds the number of actuation unit(s) (20).

16. A pipeline (3) comprising a valve assembly (1) according to any of claims 1 to 12, wherein the housing unit (10) is connected between a first tubing (5) and a second tubing (7) of the pipeline (3) so that the first port (40) is connected to the first tubing (5) and the second port (42) is connected to the second tubing (7).

17. A method for constraining the flow of a medium in a pipeline (3) by a valve assembly (1) according to any of claims 1 to 12, wherein the method comprises:

- connecting the actuation unit (20) to the housing unit (10) at the control inlet (45), and

- disengaging the stop member (50) from the control inlet (45) by means of the actuation unit,

- displacing the obstruction member (25) from a first position outside the spacing (32), through the control inlet (45), and into a second position at the seating (35) inside the spacing (32), while the spacing (32) is in a pressurized state.

18. The method according to claim 17, which further comprises:

- prior to disengaging the stop member (50) from the control inlet (45), pressurizing the chamber (62) of the actuation unit (20) to a pressure in equilibrium to a pressure of the spacing (32) of the housing unit (10).

19. The method according to any of claims 17 or 18, which further comprises:

- moving the stop member (50) to a second portion (122) of the chamber (62) located next to the further actuation outlet (100),

- isolating the chamber (62) into a first portion (120) located next to the actuation outlet (70) and said second portion (122),

- depressurizing said second portion (122) of the chamber (62) to a pressure in equilibrium with a pressure of the ambient environment,

- disengaging the further stop member (102) from the further actuation outlet (100), and

- taking the stop member (50) out through the further actuation outlet (100).

20. The method according to claim 19, which further comprises:

- subsequent to taking the stop member (50) out, introducing the obstruction member (25) through the further actuation outlet (100) and into the second portion (122) of the chamber (62), and

- engaging the further stop member (102) with the further actuation outlet (100).

21. The method according to any of claims 17 to 20, wherein the method comprises:

- subsequent to that the stop member (50) has been taken out through the further actuation outlet (100), engaging the further stop member (102) with the further actuation outlet (100),

- pressurizing the second portion (122) of the chamber (62) to a pressure in equilibrium with a pressure of the first portion (120) of the chamber (62), and

- merging the first portion (120) and the second portion (122) of the chamber (62).

22. A method for opening-up the flow of a medium in a pipeline (3) by a valve assembly (1) according to any of claims 1 to 12, wherein the method comprises:

- displacing the obstruction member (25) from a second position at the seating (35) inside the spacing (32), through the control inlet (45) and the actuation outlet (70), and to the first position in the chamber (62), while the spacing (32) is in a pressurized state,

- engaging the stop member (50) with the control inlet (45) so that the control inlet (45) is blocked, and

- disconnecting the actuation unit (20) from the housing unit (10).

23. The method according to claim 22, wherein the method comprises:

- engaging the stop member (50) or a replacement stop member (50) with the control inlet (45) by reinserting said stop member (50) into the control inlet (45).

24. The method according to any of claims 22 or 23, wherein the method comprises:

- prior to disconnecting the actuation unit (20) from the housing unit (10), depressurizing the chamber (62) of the actuation unit (20) to a pressure in equilibrium with a pressure of the ambient environment.