KR20140090432A - Isolation valve unit - Google Patents

Abstract

An isolation valve unit is disclosed. The isolation valve unit of the present invention includes: an isolation valve installed in a fluid supply line to block the fluid supply line in an emergency; and two or more blocking operation units to block a flow path of the isolation valve by supplying the fluid to the isolation valve in the emergency.

Description

[0001] ISOLATION VALVE UNIT [0002]

Field of the Invention [0002] The present invention relates to an isolation valve unit, and more particularly, to an isolation valve unit that interrupts the flow of fluid in an emergency.

With the rapid development of international industrialization and industry, the use of earth resources such as petroleum is gradually increasing, and thus the stable production and supply of oil is becoming a very important issue on a global scale.

For this reason, various marine structures suitable for economical development of marginal oil fields and deep sea oil fields which have been neglected due to economic reasons have been developed recently.

Such marine structures include various forms such as floating marine equipment, semi-submersible marine equipment, stationary marine equipment, lifting marine equipment, drilling rigs and the like.

In order to drill oil and gas existing in the basement of the sea floor, a riser or drill pipe for drilling oil and gas existing under the sea floor is fixed in an offshore structure equipped with various drilling equipments And the drilling operation is carried out.

At this time, since the riser or the drill pipe descends thousands of meters below sea level, excessive movement of the drill rig due to the wave or sea condition causes damage to the riser or the drill pipe, The damage will occur.

Therefore, in order to drill oil or gas existing in the basement of the sea floor, a compensator compensating the motion of the drill ship is required unlike the drilling equipment of the onshore plant.

If the drill ship is affected by the marine conditions and the ship is moving, the ship will perform translational motion (surge, sway, heave) and rotation (roll, pitch, Yaw), and it should be designed to minimize such hull motions to prevent damage to the drilling equipment associated with the seabed.

These hull motions at sea are compensated considerably by ballast system and dynamic positioning system (DP) system, but up and down heave requires heave compensator, which is a separate compensation device. Do.

There are two types of driving methods of the up-and-down sway compensation device, one using electricity and the other using hydraulic pressure. In the case of the electric up-and-down shake compensating device, a compensating operation is performed through a wire using drawworks. In the case of the hydraulic up-and-down shake compensating device, a separate hydraulic cylinder is added to the drawworks And a compensating method is used.

Since the up-and-down shake compensation device has a great influence on the life span of the drilling equipment and the drilling period, it is necessary to study the reliability improvement of the up-and-down shake compensation device in order to reduce the drilling cost.

Especially, emergency situations such as separation or cutting of drill pipe during drilling can cause damage to human life as well as enormous economic loss. Therefore, improvement measures are needed to prevent such accidents in advance.

Korean Patent Laid-Open Publication No. 10-2012-0035432 (Khan Co., Ltd.) 2012. 04. 16

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide an isolation valve unit which can prevent the occurrence of an emergency accident by stably and promptly shutting off a fluid supply line when an emergency situation including cutting of a drill pipe occurs.

According to an aspect of the present invention, there is provided an air conditioning system comprising: an isolation valve provided in a fluid supply line to shut off the fluid supply line in an emergency; And an isolation valve unit including at least two blocking operation portions for supplying fluid to the isolation valve in an emergency to shut off the fluid passage of the isolation valve.

Wherein the at least two blocking operation portions are provided in a line to which fluid for shutting off the isolation valve is supplied and are closed in a normal operation state; A second cut-off operation portion provided in a line branched in the first line and arranged in parallel with the line of the first cut-off operation portion and closed in a normal operation state; And a normally open portion provided in a line connecting the first blocking operation portion and the second blocking operation portion and the isolation valve and opened in a normal operation state.

And a filter unit provided on a line branched from the fluid supply line before the fluid flows into the absorption valve to filter foreign substances contained in the fluid.

An isochronizer for keeping the open operation part and the cut-off operation part at a predetermined pressure; And a line connected to the isola accumulator may further include a breakage prevention unit for preventing supply of a high pressure and a large amount of fluid to the isola accumulator in an emergency so as to prevent breakage of the isola accumulator.

In an embodiment of the present invention, when an emergency situation involving cutting of a drill pipe or the like occurs, two or more blocking operation portions for shutting off the isolation valve may be provided so that even if any one blocking operation portion is not operated, So that the occurrence of a safety accident can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a hybrid control system for an offshore structure according to an embodiment of the present invention; FIG.
Fig. 2 is a view schematically showing the air supply unit shown in Fig. 1. Fig.
FIG. 3 is a schematic view of the isolation valve unit shown in FIG. 1. FIG.
Fig. 4 is a view schematically showing the isolation valve shown in Fig. 3. Fig.
5 to 9 are operational states of the isolation valve shown in Fig.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

In this embodiment, an offshore structure refers to a structure having facilities for drilling, and therefore includes all the drilling facilities such as semi-submersible, submersible, drill ship, barge rigs, and platform rigs. do.

FIG. 1 is a schematic view of a hybrid control system for an offshore structure according to an embodiment of the present invention. FIG. 2 is a schematic view of the air supply unit shown in FIG. 1, FIG. 4 is a view schematically showing the isolation valve shown in FIG. 3, and FIGS. 5 to 9 are views showing an operation state of the isolation valve shown in FIG. 3 Fig.

As shown in these drawings, the hybrid control system of an offshore structure according to the present embodiment is provided in Derrick, and includes a heave motion active compensation that actively compensates the vertical motion of a crown block (CB) A manual motion compensation unit 200 provided in the derrick and manually compensating for the vertical motion of the crown block CB and a motion compensation unit 200 provided in the fluid supply line FL of the motion compensation unit 200, And an isolation valve unit 300 for blocking the fluid supply line FL.

The active compensation unit 100 compensates for an upward or downward movement of an offshore structure caused by a wave during a drilling operation in the ocean so that the drilling apparatus can perform the drilling operation with a certain force.

1, the active mode compensation unit 100 includes an active compensating cylinder 110 connected to a lower side of the crown block CB to compensate the vertical motion of the crown block CB, A hydraulic power unit 120 provided on the hull and supplying hydraulic pressure to the active compensation cylinder 110 and a hydraulic pressure unit 120 provided on a line connecting the active compensation cylinder 110 and the hydraulic power unit 120 to be supplied to the active compensation cylinder 110 A motion reference unit 140 provided on the hull and sensing a lifting movement of the hull caused by a wave, and a control unit 130 connected to the upper side of the active compensation cylinder 110. The servo valve 130 controls the hydraulic pressure, And a first bypass valve 150 provided on a line connecting the line and the line connected to the lower side of the active compensation cylinder 110.

1, the active compensation cylinder 110 of the active compensation unit 100 is provided with a cylinder rod 111 therein, and the cylinder rod 111 is connected to the active compensation cylinder 110 And is moved up and down by the hydraulic pressure flowing into and out of the upper and lower portions.

1, the crown block CB is connected to the lower portion of the cylinder rod 111. When the cylinder rod 111 is moved in the vertical direction, the crown block CB and the crown block CB ) Is also moved up and down by a traveling block (TB) connected by a wire rope. Therefore, when the active compensation cylinder 110 controls the ascending and descending of the crown block CB, the ascending and descending of the traveling block TB can also be controlled.

The hydraulic power unit 120 of the hybrid motion active compensation unit 100 includes an oil tank (not shown) for supplying oil to the active compensation cylinder 110 and storing the oil, (Not shown) for pumping the fuel to the fuel cell 110.

The servo valve 130 of the hybrid motion active compensation unit 100 controls the hydraulic pressure supplied from the hydraulic power unit 120 based on data measured by a motion reference unit 140 described later.

The motion reference unit 140 of the heave motion active compensation unit 100 senses the elevation movement of the offshore structure caused by the waves and sends the displacement data to a control unit (not shown) And controls the opening and closing degree of the valve 130.

The first bypass valve 150 of the active mode compensation unit 100 is opened when the active compensation cylinder 110 is lowered and the flow rate discharged from the lower side of the active compensation cylinder 110 is supplied to the active compensation cylinder 110 To compensate for the response speed and to prevent the active compensation cylinder 110 from increasing the force pressing the crown block CB to an excessively high level.

The hydraulic oil supplied from the hydraulic power unit 120 is controlled by the servo valve 130 so that the displacement of the cylinder rod 111 of the active compensation cylinder 110 is actively . The control at the servo valve 130 uses the measured hull motion of the hull motion from the motion reference unit 140. [

As shown in Fig. 1, the heave motion manual compensating section 200 has a load acting on a traveling block TB, which is disposed on the lower side of the crown block CB and connected to the crown block CB by a wire rope, But also serves to compensate for the upward and downward movements of the offshore structure caused by the wave and to hold its own position.

In the present embodiment, the heave motion manual compensating part 200 includes a plurality of manual compensating cylinders 210 (hereinafter, referred to as " manual compensating cylinders ") that are coupled to the derrick at the lower part and connected to support the crown block CB to compensate the vertical motion of the crown block CB A plurality of accumulators 220 provided in the derrick and connected to the plurality of manual compensation cylinders 210 and an air supply unit 230 provided in the hull and supplying air to the plurality of accumulators 220.

3, the internal volume V _A of the manual compensating cylinder 210 is connected to the accumulator 220. The accumulator 220 is connected to the manual compensating cylinder 210. The manual compensating cylinder 210 of the hybrid motion compensating unit 200 is connected to the accumulator 220, ) May be equal to the stored internal volume (V _B ).

The accumulator 220 is moved by the stroke of the manual compensating cylinder 210 and the manual compensating cylinder 210 is moved upward by the relative movement of the oil stored in the manual compensating cylinder 210 and the accumulator 220 Or falls.

Also, the load applied to the manual compensation cylinder 210 can be supported by the high-pressure air supplied to the accumulator 220, which will be described later.

The manual compensation cylinder 210 and the accumulator 220 may be applied to a case where a plurality of the manual compensation cylinders 210 and the accumulators 220 are provided.

The accumulator 220 of the heave motion manual compensating unit 200 converts the high pressure air supplied from the air supply unit 230 described later into oil pressure to support the manual compensation cylinder 210, .

In the present embodiment, the interior of the accumulator 220 is divided into a space filled with oil and a space filled with air, and a space filled with air is connected to the air supply unit 230. And the volume V _B of the space in which the oil is filled may be equal to the internal volume V _A of the manual compensation cylinder 210 as described above.

The air supply unit 230 of the heave motion manual compensating unit 200 supplies high pressure air to the plurality of accumulators 220 so that the air compressor unit 230 for generating high pressure air A main valve 232 provided on a line connecting the air compressor 231 and the plurality of accumulators 220 to automatically open and close the line thereof; A second bypass valve 234 that bypasses the main valve 232 to supply air when the main valve 232 fails and is automatically opened and closed, And is provided on a line branched from a line connecting the main valve 232 and the plurality of accumulators 220 so that high pressure air in the line can be removed in the event of a safety problem of the manual motion compensating unit 200, A vent valve 235, Provided in a plurality in the line between the shutter 231 and the main valve 232 and includes an on-off valve 236 is manually operated.

The air storage tank 233 of the air supply unit 230 may be provided in parallel to the line connecting the air compressor 231 and the main valve 232 to store sufficient air. If the accumulator 220 requires a large amount of air, it may open all of the air storage tanks 233 to supply sufficient air. If the accumulator 220 requires less air, only one of the air storage tanks 233 may be opened, .

1, the isolation valve unit 300 is provided in a line connecting a plurality of manual compensating cylinders 210 and a plurality of accumulators 220, and when an emergency situation occurs such as disengagement or cutting of a drill pipe or the like By blocking the above-mentioned line, hydraulic pressure is not supplied to the manual compensation cylinder 210, thereby preventing the occurrence of a dangerous accident.

3, the isolation valve unit 300 is provided in a fluid supply line FL connecting a plurality of manual compensation cylinders 210 and a plurality of accumulators 220, An isolation valve 400 for shutting off the line FL and an open valve 400 for supplying fluid to the isolation valve 400 when the heave motion manual compensation unit 200 is normally operated to maintain the isolation valve 400 in an opened state, An operation part 500 and two or more interrupting operation parts 600 for interrupting the fluid passage of the isolation valve 400 by supplying a fluid to the isolation valve 400 in an emergency, An isosol accumulator 700 which keeps the operating part 600 at a predetermined pressure and a fluid supply line FL which is branched from the fluid supply line FL flowing into the isolation valve 400 and connected to the isola accumulator 700, Is includes a breakage prevention element 800 for preventing damage of the emergency isolating eye prevents a large amount of high-pressure fluid is supplied to the accumulator 700, the accumulator brush 700.

The isolation valve 400 is provided in a fluid supply line FL connecting the manual compensation cylinder 210 and the accumulator 220 and is opened in a normal state (see FIG. 5) (See FIG. 6) so as to prevent the fluid from flowing through the fluid supply line FL when an emergency such as cutting of a drill pipe or the like occurs.

4, the isolation valve 400 is provided to open and close the first space portion 411a and the first space portion 411a, which are moving passages for the fluid supplied to the inside of the isolation valve 400 A valve body 410 provided with a second space 412a serving as a fluid storage space, a valve shaft 420 provided on the valve body 410 to open and close the moving passage, And an elastic body 430 provided on the valve body 411a and elastically supporting the valve shaft 420. [

4, the valve body 410 of the isolation valve 400 includes a first body 411 provided with a first space 411a and serving as a passage through which the fluid flows, A second body 412 provided with an open hole 412b and a closing hole 412c serving as fluid passages for moving the valve shaft 420 to open and close the valve body 411a, And a cap 413 coupled to the valve shaft 420 and supporting one side of the valve shaft 420.

In this embodiment, the first space portion 411a and the second space portion 412a can be sealed from each other so that the fluid is not moved, the first space portion 411a becomes the movement path of the circulating oil, The volume of the first space portion 411a may be larger than the volume of the second space portion 412a because the portion 412a is a storage space for the fluid to move the valve shaft 420. [

The flange 421 of the valve shaft 420 is closely attached to the right side portion of the first body 411 so that the oil of the oil body 411 It can be bent so as to block the movement passage.

4, the first body may be provided with a plurality of discharge holes 411c, and the fluid introduced into the first space portion 411a may be discharged through a plurality of discharge holes 411c And then supplied to the manual compensation cylinder 210, as shown in Fig.

The right portion of the first body 411 is shown as opened in FIG. 4, but the remaining portion is omitted. The right portion of the first body 411 is hermetically closed, and holes through which the oil flows are provided.

A support hole 413a through which the valve shaft 420 passes is formed in the center of the cap 413 and a sealing member (not shown) is provided around the support hole 413a, It is possible to prevent the oil from leaking into the space between the valve shaft 420 and the valve shaft 420.

The oil supplied through the opening operation part 500 is introduced into the open hole 412b of the second body 412 to push the valve shaft 420 to the right to seal the first space part 411a The oil supplied through the cut-off operation portion 600 flows into the close hole 412c and the first space portion 411a is blocked by pushing the valve shaft 420 to the left (see FIG. 8) ).

The valve shaft 420 of the isolation valve 400 is moved in the valve body 410 to the left or to the right with reference to FIG. 4 to open or block the first space portion 411a, It serves to open or shut off the flow.

A flange 421 for blocking the oil passage is provided at the right end of the valve shaft 420 and a seat 422 for supporting the right side of the elastic body 430 is provided at the center. The valve shaft 420 in the second space 412a region is provided with an opening and closing guide protrusion 423 for partitioning the second space 412a into a closed space and the opening and closing guide protrusion 423, A sealing member (not shown) may be provided between the inner walls of the partition 412a to prevent the oil from leaking into the partitioned space.

4, the elastic body 430 of the isolation valve 400 is provided between the support groove 411b of the first body 411 and the seat 422 of the valve shaft 420 so that the valve shaft 420 ) Of the elastic member.

The elastic body 430 supports the valve shaft 420 together with the oil flowing through the open hole 412b of the second body 412 when the isolation valve 400 is open, In a state in which the isolation valve 400 is shut off, the state of being contracted and contracted by a large amount of fluid flowing into the first space portion 411a is maintained by the oil flowing through the close hole 412c.

That is, in this embodiment, the elastic body 430 is designed to have an elastic force for supporting the valve shaft 420 so that fluid flows into the first space portion 411a in a normal operating state, and flows into the first space portion 411a It can be designed to shrink when the flow rate exceeds the designed flow rate.

Therefore, when a flow rate equal to or greater than a predetermined flow rate is introduced into the first space portion 411a, the elastic body 430 is contracted to block the fluid passage in the first space portion 411a, And is retained by the oil flowing into the space portion 412a.

3, the open operation part 500 is provided on a line connecting the fluid storage tank FT and the isolation valve 400 so that the oil can flow through the fluid supply line FL in a steady state. And opens the isolation valve 400 (see Fig. 9).

That is, the oil supplied from the fluid storage tank FT flows into the open hole 412b of the isolation valve 400 via the open operation part 500. The fluid introduced into the open hole 412b flows into the valve shaft 420, To the right with reference to Fig. As a result, the oil introduced into the first space portion 411a may be discharged to the outside of the first space portion 411a and then supplied to the manual compensation cylinder 210 through the fluid supply line FL. At this time, even if the oil is not supplied to the off-hole 412b, since the elastic body 430 is expanded to the original state, the elastic body 430 can be kept open by the elastic force of the elastic body 430.

In this embodiment, the open operation part 500 includes a first solenoid valve 510 provided on a line connecting the fluid storage tank FT and the isolation valve 400 to selectively block the line, And a second solenoid valve 520, which is provided in a line connecting the rear end of the second solenoid valve 510 and the isolation valve 400 and is closed in a normal state.

When maintenance of the line connecting the first solenoid valve 510 and the second solenoid valve 520 is required in the present embodiment, the first solenoid valve 510 and the second solenoid valve 520 are closed, You can also maintain lines.

As shown in FIG. 3, the cut-off operation portion 600 includes two lines connected in parallel to the line connecting the fluid storage tank FT and the isolation valve 400, so that any one cut-off operation portion 610 may be broken The isolation valve 400 may be blocked by another isolation operation unit 620 so that the isolation valve 400 can be stably shut off in an emergency.

In this embodiment, the cut-off operation portion 600 includes a first cut-off operation portion 610, a second cut-off operation portion 620, and a normally open portion 630, which are respectively provided in parallel to the above- The cut-off operation portion 610 and the second cut-off operation portion 620 are kept closed when the fluid flows through the normal state, that is, the isolation valve 400.

Accordingly, the oil supplied through the first blocking operation portion 610 and the second blocking operation portion 620 in the fluid storage tank FT is blocked by the first blocking operation portion 610 and the second blocking operation portion 620 The valve shaft 420 does not flow into the close hole 412c of the isolation valve 400, so that the valve shaft 420 maintains the open position.

However, in the event of an emergency such as cutting or detaching of the drill pipe, the first cut-off operation portion 610 and the second cut-off operation portion 620 are changed to the open state by the applied signal, 610 and the second cut-off operation portion 520 are opened.

As a result, the oil flows into the close hole 412c of the isolation valve 400, and the fluid passage of the first space portion 411a is blocked by the elastic body 430 contracted by the inflow of a predetermined flow rate or more 420 are kept blocked by the oil flowing into the close hole 412c, as shown in Fig. Therefore, the oil does not flow into the fluid supply line FL.

In this embodiment, the first blocking operation portion 610 and the second blocking operation portion 620 may include a solenoid valve and may include a pressure transmitter PT provided at each of the leading lines. On the other hand, in the present embodiment, the pressure transmitters PT may be provided in plural as shown in Fig.

3, the normally open portion 630 is provided at the end line of the first cut-off operation portion 610 and the second cut-off operation portion 620 and is kept in the normally open state, ) Maintenance of the line can be closed if necessary.

3, the normally open portion 630 includes a third solenoid valve 631 provided on a line connecting the second cut-off operation portion 620 and the isolation valve 400, And a fourth solenoid valve 632 provided on a line connecting the third solenoid valve 631 and the isolation valve 400.

3, the iso-accumulator 700 is provided at the end of the branch line LS branched from the leading-edge fluid supply line FL of the isolation valve 400, And serves to maintain the valve of the part 600 at a predetermined pressure. In this case, there is an advantage that the response speed of the opening operation part 500 and the blocking operation part 600 can be improved.

3, the breakage preventing portion 800 is provided at the leading end branch line LS of the isola accumulator 700. When the pressure in the branch line LS is rapidly increased or the flow rate is increased, Thereby preventing the breakage of the isola accumulator 700. As shown in Fig.

3, the breakage prevention unit 800 includes a first check valve 810 that blocks oil from being supplied to the isola accumulator 700, a first check valve 810 that interrupts the supply of oil to the isola accumulator 700, And a throttle valve 820 provided on the line arranged in parallel with the line provided to gradually increase the amount of oil passing through the line.

Hereinafter, the operation of the breakage preventing section will be briefly described. The oil is not directly supplied to the isola accumulator 700 by the first check valve 810 when the flow rate supplied to the isola accumulator 700 is rapidly increased or the pressure is increased. In this case, since the flow of the oil is bypassed through the throttle valve 820, the throttle valve 820 itself has a characteristic of gradually passing the amount of the fluid through which the impact applied to the isola accumulator 700 is reduced.

As shown in FIG. 3, the present embodiment includes a filter unit 900 provided on the branch line to remove foreign substances in the fluid, and a filter unit 900 that bypasses the isolation valve 400 A first working part 1100 provided in the oil replenishing line OL and a second working part 1100 provided in the branch line LS and supplied to the filter part 900. The bypass part 1000 is provided to the manual compensation cylinder 210, And a branch line valve 1200 for opening and closing the flow of the branch line 1200.

3, the filter unit 900 includes an inline filter 910 provided on the leading line of the breakage prevention unit 800 to filter foreign substances in the fluid supplied to the branch line LS, And a second check valve 930 provided at the rear end line of the inline filter 910 to prevent the oil from flowing backward from the rear end line. The first ball valve 920 is provided at the front end line of the inline filter 910 and opens and closes the front end line. do.

The bypass unit 1000 is provided to allow oil supplied to the manual compensation cylinder 210 or supplied from the manual compensation cylinder 210 to flow without passing through the isolation valve 400, A bypass line 1010 connecting the fluid supply line FL at the front end of the solenoid valve and the fluid supply line FL at the rear end thereof and a third bypass valve 1020 provided at the bypass line 1010, .

As shown in FIG. 3, the initial operation portion 1100 is provided in the oil supplement line OL and supplies fluid to the fluid supply line FL at the initial operation of the free motion compensating portion 200, A second ball valve 1110 provided in the supplemental line OL and a second ball valve 1110 provided in the oil replenishing line OL so as to be arranged in parallel with the second ball valve 1110 to prevent the oil in the fluid supply line FL from flowing backward And a third check valve 1120. [

The reference character DW is a draw work, and DA is a dead line anchor.

Hereinafter, the operating state of the present embodiment will be briefly described with reference to the above-mentioned drawings.

First, in a steady state in which no accident such as cutting or disconnection of a drill pipe or the like occurs, an isolation (not shown) provided in a fluid supply line FL connecting a plurality of manual compensating cylinders 210 and a plurality of accumulators 220 on the upper portion of the hybrid motion- Since the valve 400 is opened as shown in FIG. 5, the fluid is supplied to the fluid supply line FL to compensate the vertical motion of the crown block CB and the like.

Next, during emergency such as cutting of the drill pipe, the flow rate of the oil flowing into the first space portion 411a exceeds the predetermined flow rate, so that the elastic body 430 is contracted due to the flow rate exceeded.

When the elastic body 430 is retracted, the valve shaft 420 is moved in the shrinking direction of the elastic body 430, so that the fluid passage in the first space portion 411a is closed as shown in FIG.

Thereafter, as shown in Fig. 7, the closed cut-off operation portion 600 is opened and oil flows into the close hole 412c of the isolation valve 400 through the cut-off operation portion 600. [ When the oil flows into the close hole 412c, the valve shaft 420 keeps the first space portion 411a blocked by the pressure of the oil. Since the fluid supply line FL is blocked by the isolation valve 400 being cut off, no further oil is supplied to the manual compensation cylinder 210, thereby preventing the occurrence of additional accidents.

Finally, when the emergency situation is ended, the valve of the cut-off operation part 600 is closed to cut off the oil supplied to the close hole 412c, and then the valve of the open operation part 500 is opened .

In this case, as shown in Fig. 8, the oil flows into the open hole 412b to move the valve shaft 420 to the right as shown in Fig. When the valve shaft 420 is moved to the right side, the fluid passage of the first space portion 411a that has been closed is opened and fluid flows through the fluid supply line FL.

5, even when the valve of the opening operation part 500 is closed, the elastic body 430 is returned to its original state, and the flow rate of the oil flowing into the first space part 411a also falls within a predetermined range So that the valve shaft 420 is supported by the elastic body 430 and remains open.

As described above, according to the present embodiment, when an emergency situation occurs due to cutting of the drill pipe or the like during drilling, two or more cut-off operation portions for cutting off the isolation valve are provided, It is possible to shut off the isolation valve so that the occurrence of a safety accident can be prevented.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

100: Hybmotion active compensation unit 110: Active compensation cylinder
120: Hydraulic power unit 130: Servo valve
140: motion reference unit 150: first bypass valve
200: Heave motion manual compensation unit 210: Manual compensation cylinder
220: accumulator 230: air supply unit
300: Isolation valve unit 400: Isolation valve
410: valve body 420: valve shaft
430: elastic body 500: open operation part
510: first solenoid valve 520: second solenoid valve
600: interrupting operation part 610: first interrupting operation part
620: second cut-off operation part 630: normally open part
700: Isol Accumulator 800: Breakage prevention part
810: first check valve 820: throttle valve
900: Filter section 910: Inline filter
920: first ball valve 930: second check valve
1000: Bypass unit 1010: Bypass line
1030: Third bypass valve 1100:
1110 Second ball valve 1120: Third check valve
CB: Crown block DA: Deadline anchor
DW: drawwalk FL: fluid supply line
FT: fluid storage tank LS: branch line
LV: Branch line valve OL: Oil supplement line
TB: Traveling block

Claims (4)

An isolation valve provided in the fluid supply line to shut off the fluid supply line in an emergency; And
And at least two shut-off operation portions for supplying fluid to the isolation valve in an emergency so as to shut off the fluid passage of the isolation valve. The method according to claim 1,
The two or more blocking operation portions
A first shut-off operation part provided on a line to which fluid for shutting off the isolation valve is supplied and closed in a normal operation state;
A second cut-off operation portion provided in a line branched in the first line and arranged in parallel with the line of the first cut-off operation portion and closed in a normal operation state; And
And a normally open portion provided in a line connecting the first cutoff operation portion and the second cutoff operation portion and the isolation valve and opened in a normal operation state. The method according to claim 1,
Further comprising a filter portion provided on a line that branches off from the fluid supply line before the fluid flows into the isolation valve to filter foreign matter contained in the fluid. The method according to claim 1,
An isochronous accumulator for maintaining the open operation part and the cut-off operation part at a predetermined pressure; And
Wherein the line connected to the isola accumulator further comprises a breakage preventing unit for preventing supply of a high pressure and a large amount of fluid to the isola accumulator during an emergency so as to prevent breakage of the isola accumulator.

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