KR101773036B1 - High differential pressure expansion valve for re-liquefy of cryogenic high pressure gas - Google Patents

Abstract

The present invention relates to a high differential pressure expansion valve to re-liquefy cryogenic high pressure gas, facilitating opening/closing of a passage in a disk, and removing concerns about abrasion, breakage, and excessive generation of noise. According to the present invention, the valve comprises: a valve body; a seat cage assembly including inner and outer seat cages, a seat ring member coupled to the inner seat cage, and a pick ring disposed between the inner seat cage and the seat ring member; a cylindrical cage assembly including an outer cylindrical cage and at least one inner cylindrical cage, wherein all of the outer and inner cylindrical cages have a plurality of third fluid through-holes formed therein; a hood member fixated and coupled to the valve body; and a stem and micro plug member increasing/decreasing the area of a micro passage through a change of an opening ratio through vertical movement with the pick ring disposed therebetween.

Description

TECHNICAL FIELD [0001] The present invention relates to a high-pressure expansion valve for re-liquefaction of a cryogenic high-pressure gas,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high pressure differential expansion valve for re-liquefaction of cryogenic high pressure gas, and more particularly, to a high pressure differential expansion valve for re-liquefaction of cryogenic high pressure gas, Pressure expansion valve for re-liquefaction of cryogenic high-pressure gas for re-liquefaction through decompression.

In recent years, inexpensive natural gas, which is inexpensive with oil, has been widely used as an energy source. These natural gases are made from liquefied natural gas to cool down to about -162 ° C under atmospheric pressure to reduce their volume through condensation to facilitate storage and transport. Liquefied natural gas has a volume of about 1/600 of that of natural gas under atmospheric pressure, which is very convenient for transportation and storage.

In recent years, the use of liquefied natural gas has been expanding, including the use of high-pressure liquefied natural gas as fuel instead of conventional diesel fuel. In the case of cryogenic high-pressure gas such as liquefied natural gas, surplus gas is generated during transportation, storage or use, and it is necessary to re-liquefy and store and use it.

A high differential pressure valve using the line-Thomson effect has been used for re-liquefaction of cryogenic high-pressure gas.

A representative example of such a high differential pressure valve is "High Differential Pressure Control Valve for Offshore Plant" of Patent Document 1 to be described later and "Disk Laminated High Differential Pressure Control Valve for Offshore Plant" of Patent Document 2.

The above Patent Documents 1 and 2 include a disc laminate for utilizing the fluid flow principle in accordance with the line-Thomson effect of the high differential pressure valve. The disc stacking body reduces the moving speed of the fluid while increasing the length and the passing area of the flow path for reducing the pressure of the inflow fluid so that the disc stacking body can be separated from each other And a plurality of discs each having a connection groove connecting the two flow grooves or one or both of the connection grooves are stacked.

However, in the case of a disk stack composed of a plurality of stacked disks, precise stacking is difficult when the working dimensions of the disks are different, and precise alignment at the time of stacking is not easy even if there is no problem with the machining dimensions. That is, when the machining dimensions of the respective stacked disks are different or precision alignment is not properly performed, the flow path is opened or closed by inserting it into the inner hollow portion of the disk stack body and reciprocating in the longitudinal direction to regulate the flow rate There is a problem that the plunger of the disk stack body easily wears or breaks due to friction with the disk stack body or causes severe noise.

In addition, since the plunger can not precisely control the opening or closing of the flow path, the flow rate can not be properly controlled, thereby making it impossible to control the precision flow rate of the differential pressure valve.

In addition, the disc laminate should be depressurized by the high pressure fluid alone, and if the pressure difference required to reduce the pressure is 300 bar or more, the disc laminate and the plunger cause severe wear or noise due to excessive pressure difference. .

KR 10-1356123 B1 KR 10-1376093 B1

Accordingly, it is an object of the present invention to solve the above problems and to provide a high pressure differential valve which is capable of changing the disc structure having a passage for reducing pressure in a high differential pressure valve, Pressure expansion valve for re-liquefaction of cryogenic high-pressure gas which does not cause wear, breakage or excessive noise.

Another problem to be solved by the present invention is to solve the above problems and to provide a high-pressure expansion valve for re-liquefaction of cryogenic high-pressure gas capable of precisely controlling the opening or closing of the flow path, .

Another problem to be solved by the present invention is to solve the above problems and to provide a high pressure differential valve which is capable of reducing the pressure of the fluid sequentially in a plurality of spaces in the high differential pressure valve, Pressure expansion valve for re-liquefying a cryogenic high-pressure gas which can reduce the pressure of the cryogenic high-pressure gas.

According to an aspect of the present invention, there is provided a high pressure differential expansion valve for re-liquefaction of cryogenic high-pressure gas, comprising: a valve body having an inlet portion, a discharge portion and a cage housing portion; An outer sheet cage having a plurality of first fluid passing holes penetrating from an outer diameter toward an inner seat cage receiving hole at predetermined intervals, a part of the outer sheet cage having a predetermined distance from the inner diameter of the outer sheet cage, A first micro passageway communicating with the outer seat cage while being accommodated in the inner seat cage receiving hole and having a micro plug passing hole penetrating the inside in the up and down direction is formed and penetrates from the outside diameter toward the micro plug passing hole, And a second fluid passage hole A seat cage assembly having an inner seat cage, a seat ring member coupled to the inner seat cage, and a pick located between the inner seat cage and the seat ring member, And at least one inner cylindrical cage vertically laterally received in the interior of the outer cylindrical cage, wherein the outer cylindrical cage and the at least one inner cylindrical cage both have an inner diameter direction And a plurality of third fluid pass holes are formed at predetermined intervals toward the first fluid pass hole, wherein each of the adjacent third fluid pass holes is mutually misaligned so as to reduce a cross-sectional area of a portion where mutually contacting portions are in contact with each other, A bonnet member fixedly coupled to the valve body in a state where the cylindrical cage assembly is fixed to the cage accommodating portion; and a plurality of bolt members accommodated in the seat cage assembly and the cylindrical cage assembly, And a stem and a micro plug member for adjusting the flow rate through the micro flow path by increasing or decreasing the area of the micro flow path by changing the opening ratio between the micro flow path and the micro flow path.

According to an aspect of the present invention, there is provided a high pressure differential expansion valve for re-liquefaction of cryogenic high-pressure gas, comprising a cage spacer having a stem through-hole formed therein in a vertical direction and being seated on an upper portion of the cylindrical cage assembly can do.

The inner seat cage includes an inner seat cage body, a lower seat portion coupled to a lower portion of the inner seat cage body to close a lower portion of the micro plug passage, and a seat ring member coupled to an upper portion of the inner seat cage body, And a coupling portion.

Wherein the seat ring member includes a seat ring body in which a seat cage engaging groove, a pick receiving recess and a micro plug through hole are sequentially formed from the bottom to the top in a vertical direction, And the picking recess may receive and couple the pick to an upper portion of the seat cage coupling groove.

The bonnet member includes a bonnet body having a lower pressing portion protruding downward at a lower portion thereof. The lower pressing portion contacts the upper surface of the cage spacer to press the cage spacer in a downward direction, And may be fixedly coupled.

As described above, according to the high-pressure expansion valve for re-liquefaction of cryogenic high-pressure gas according to the present invention, it is possible to precisely align it by the modified side-coupling type reduced-pressure cage structure which is not a vertical lamination type but can easily open or close the micro flow path, There is an advantageous effect that there is no fear of excessive noise generation.

Further, according to the high-pressure expansion valve for re-liquefying cryogenic high-pressure gas according to the present invention, the opening or closing of the micro-flow passage can be precisely controlled, and a precise flow rate control of the differential pressure valve can be controlled under the micro-flow passage condition.

According to the high-pressure expansion valve for re-liquefaction of cryogenic high-pressure gas according to the present invention, a plurality of pressure-reducing cages are provided so as to sequentially perform appropriate pressure reduction, thereby reducing excessive pressure difference before and after pressure reduction, thereby reducing wear and noise There is an advantageous effect that can be made.

1 and 2 are an exploded cross-sectional view and an assembled cross-sectional view, respectively, of a high-pressure expansion valve for re-liquefaction of cryogenic high-pressure gas according to an embodiment of the present invention,
FIG. 3 is an enlarged view of the 'A' region of FIG. 2,
FIG. 4 is a partially cutaway perspective view of the inner and outer seat cages, which are the ends of the high-pressure expansion valve for re-liquefying cryogenic high-pressure gas according to an embodiment of the present invention;
5 is a partially cutaway perspective view of a cylindrical cage assembly, which is a part of a high pressure differential expansion valve for re-liquefaction of cryogenic high pressure gas according to an embodiment of the present invention,
6 is a cross-sectional view illustrating a depressurization process using a high-pressure expansion valve for re-liquefaction of a cryogenic high-pressure gas according to an embodiment,
FIG. 7 is a partially cutaway perspective view for explaining a first pressure reduction process in internal and external seat cages, which are parts of a high pressure differential expansion valve for re-liquefaction of cryogenic high pressure gas according to an embodiment of the present invention;
8 is a cross-sectional view taken along line BB 'of FIG. 7,
9 is a partial cutaway perspective view for explaining a second pressure reducing process in a cylindrical cage assembly, which is a sun block of a high pressure differential expansion valve for re-liquefaction of cryogenic high pressure gas according to an embodiment of the present invention,
10 is a cross-sectional view cut along the line CC 'in FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various other forms, and it should be understood that the present embodiment is intended to be illustrative only and is not intended to be exhaustive or to limit the invention to the precise form disclosed, To fully disclose the scope of the invention to a person skilled in the art, and the invention is only defined by the scope of the claims.

Like reference numerals refer to like elements throughout the specification. The embodiments described herein will be described with reference to an ideal cross-sectional view, an enlarged view, and a partially cutaway perspective view of the present invention.

Hereinafter, with reference to the accompanying drawings, a configuration and operation method of a high pressure differential expansion valve for re-liquefaction of cryogenic high pressure gas according to an embodiment of the present invention will be described with reference to the accompanying drawings. Will be described in detail.

Hereinafter, a high-pressure expansion valve for re-liquefaction of cryogenic high-pressure gas according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5. FIG.

1 and 2 are an exploded sectional view and an assembled cross-sectional view, respectively, of a high-pressure expansion valve for re-liquefaction of cryogenic high-pressure gas according to an embodiment of the present invention. FIG. 5 is a partially cutaway perspective view of an inner and an outer seat cage, which are parts of a high pressure differential expansion valve for re-liquefaction of a cryogenic high pressure gas according to an embodiment of the present invention; and FIG. Sectional view of a cylindrical cage assembly, which is a valve part;

1 to 5, the high differential pressure expansion valve for re-liquefaction of cryogenic high pressure gas according to an embodiment of the present invention includes a valve body 100, a seat cage assembly 200, a cylindrical cage assembly 300, A spacer 400, a bonnet member 5000 and a spark and a micro plug member 600.

The valve body 100 is formed such that the inlet 110 through which the vaporized fluid flows and the outlet 120 through which the re-liquefied fluid is discharged correspond to both sides of the valve body 100, And a cage accommodating portion 130 having an open upper portion.

The seat cage assembly 200 is accommodated in a lower portion of the cage accommodating portion 130 and firstly reduces the high pressure gas introduced through the inlet portion 110. [ To this end, the seat cage assembly 200 includes an outer seat cage 210, an inner seat cage 230, a pick ring 250 and a seat ring member 270.

The outer seat cage 210 includes an outer seat cage body 212 generally cylindrical in shape. The outer sheet cage body 212 is formed with an inner seat cage receiving hole 214 through which the inside of the outer seat cage body 212 penetrates in the vertical direction and has a first fluid passage hole 216 are formed at predetermined intervals.

The inner seat cage 230 is formed in a generally cylindrical shape and a part of the inner seat cage 230 is accommodated in the inner seat cage accommodating hole 214 so as to have a flow path connecting groove 246 with a predetermined spacing from the inner diameter of the outer seat cage body 212 An inner seat cage body 232, a lower seat portion 233, and a seat ring member engagement portion 238 which are mutually coupled with the outer seat cage 210 by a fixing method such as welding.

The inner sheet cage body 232 is formed with a micro plug through hole 234 penetrating the inside of the inner seat cage body 232 in the up and down direction. The inner sheet cage body 232 is penetrated from the outer diameter toward the micro plug through hole 234, And a plurality of second fluid pass holes (236) which are not located on a straight line are formed at predetermined intervals.

The lower seating portion 233 is connected to the lower portion of the inner seat cage body 232 by a diameter larger than the diameter of the inner seat cage body 233 to close the lower portion of the micro plug passage 234, 232 of the outer sheet cage body 212. As shown in FIG.

The seat ring member engaging portion 238 is integrally coupled to the upper portion of the inner seat cage body 232 and the inner seat cage body 232 to have a diameter smaller than that of the inner seat cage body 232. [ A threaded portion is formed on the outer diameter of the seat ring member coupling portion 238 and a micro plug through hole 234 penetrating in the up and down direction is similarly formed. ).

The seat ring member 270 includes a seat ring body 272 in which a seat cage engagement groove 276 and a pick receiving recess 275 and a micro plug through hole 274 are sequentially formed from the bottom to the top in the vertical direction do.

The seat cage engaging groove 276 is formed with a thread corresponding to the outer diameter thread of the seat ring member engaging portion 238 so that the seat cushion engaging portion 238 is received and coupled to the seat ring body 272 do.

The pick receiving groove 275 has a smaller diameter than the seat cage engaging groove 276 at the upper portion of the seat cage engaging groove 276 to receive and engage the pick 250.

The micro plug through hole 274 is formed in the upper portion of the pick receiving groove 275 so as to pass through the smaller diameter than the pick receiving groove 275 in the up and down direction.

An upper coupling end 278 is formed at the upper outer diameter of the seat ring member 270, and a gasket coupling end 277 is formed at the lower outer diameter.

The gasket coupling end 277 is seated on the lower end of the cage receiving portion 130 of the valve body 100 so that the seat cage assembly 200 can directly open the fluid between the inlet portion 110 and the discharge portion 120 .

The peeling ring 250 is made of a material resistant to abrasion, friction or chemical such as natural rubber, synthetic rubber or synthetic resin and has an inner seat cage 230, a seat ring member 270 and a stem and a micro plug member 600 ) Reduce clearance of assembly and engagement tolerances. Accordingly, the pick 250 performs an auxiliary function of reducing the passage pressure of the fluid so as to be close to the zero leak during the closing operation of the valve, and precisely controls the flow rate at the time of controlling the minute passing flow rate .

The cylindrical cage assembly 300 is accommodated in a central portion of the cage receiving portion 130 while the lower portion thereof is fixedly coupled to the upper portion of the seat cage assembly 200. The cylindrical cage assembly 300 secondly reduces the pressure-reduced gas that has been firstly reduced in pressure by the seat cage assembly 200. When the secondary pressure is reduced, the pressure of the fluid of the primary pressure-reduced gas is further reduced, and the vaporization gas is re-circulated. To this end, the cylindrical cage assembly 300 includes an outer cylindrical cage 312 and at least one inner cylindrical cage 313 vertically laterally received within the outer cylindrical cage 312.

The outer cylindrical cage 312 and the inner cylindrical cage 313 have a plurality of third fluid pass holes 316 formed at equal intervals in the inner diameter direction from the outer diameter at predetermined intervals, (316) are connected to each other by fixing means such as welding with mutual misalignment so that the flow path cross-sectional area of the passage hole (316) of mutually contacting portions is reduced.

The outer cylindrical cage 312 has an upper coupling end 318 recessed along the upper periphery thereof and a lower coupling end 317 protruding along the lower periphery thereof. The lower coupling end 317 is interlockingly engaged with the upper coupling end 278 of the seat ring member 270. The innermost inner cylindrical cage 313 is formed with a stem passing hole 314 penetrating in the vertical direction. Accordingly, since the inner cylindrical cage 313 does not have a machining error in the vertical direction or a stacking error due to stacking of the disk stacked body as in the prior art, the stem 650 does not interfere with the vertical movement of the stem 650, There is an advantageous effect that it is possible to solve the problem that it easily wears or breaks due to friction between the cylindrical cages 313 or causes severe noise.

The cage spacer 400 is formed with a stem through hole 414 in the up and down direction and has a protruded lower coupling end 417 at the lower circumferential portion thereof to engage with the upper coupling end 318 of the outer cylindrical cage, And a spacer body 412 which is formed of a metal.

The cage spacer 400 may be formed by filling the space between the bonnet member 500 and the cylindrical cage assembly 300 when the bonnet member 500 to be described later is coupled to the valve body 100 to stably accommodate the cylindrical cage assembly 300 Fix and prevent flow.

The bonnet unit 500 includes a bonnet body 510 having a stem passage hole 514 formed therein and having a lower pressing part 512 protruded downward. The bonnet member 500 is inserted into the upper portion of the valve body 100 in a state where the lower pressing portion 512 contacts the upper surface of the cage spacer 400 to press the cage spacer 400 in the downward direction, And are fixedly coupled by fixing means. Accordingly, the seat cage assembly 200, the cylindrical cage assembly 300, and the cage spacer 400 are held and fixed at predetermined positions of the cage receiving portion 130 by the bonnet member 500, and unnecessary flow is prevented .

The stem and micro plug member 600 includes a rod-shaped stem 650 and a micro-plug 610 with the stem 650 extending downward.

The stem 650 is vertically moved in the vertical direction while being accommodated in the stem through holes 314, 414, and 514 by vertically moving members (not shown).

The micro plug 610 moves up and down in the micro plug through holes 234 and 274 through the vertical movement of the stem 650.

The micro plugs 610 are formed in the first and second flow rate adjusting grooves 614 and 616 whose opening degrees are increased as they are further away from the stem 600 on a part of the outer circumferential surface of the micro plug body 612, Respectively. The first flow rate adjusting groove 614 and the second flow rate adjusting groove 616 may be formed to have different opening rates.

Accordingly, when the micro plug 610 moves downward, the opening rate is reduced and a very fine flow path is formed between the micro plug 610 and the pick 250. Therefore, only the minute flow rate of the gas, which is primarily reduced through the seat cage assembly 200, It goes through the euro. On the contrary, when the micro plug 610 moves upward, the opening ratio is increased and a wider flow path is formed between the micro-plug 610 and the pick 250, so that the gas, which is primarily decompressed through the seat cage assembly, . That is, since the area of the micro flow path can be precisely increased or decreased through the movement of the micro plug 610 in the up and down direction, the micro flow rate can be controlled.

Hereinafter, a method of operating the high-pressure expansion valve for re-liquefying cryogenic high-pressure gas according to an embodiment of the present invention will be described in detail with reference to FIGS. 6 to 10. FIG.

FIG. 6 is a cross-sectional view illustrating a depressurization process using a high-pressure expansion valve for re-liquefaction of a cryogenic high-pressure gas according to an embodiment of the present invention. FIG. 8 is a cross-sectional view taken along the line BB 'of FIG. 7, and FIG. 9 is a cross-sectional view of a cryogenic temperature sensor according to an embodiment of the present invention. FIG. 10 is a partially cutaway perspective view illustrating a second pressure reduction process in a cylindrical cage assembly, which is a part of a high pressure differential expansion valve for re-liquefying high pressure gas, and FIG. 10 is a cross sectional view cut along the line CC 'in FIG.

When the cryogenic high pressure gas requiring re-injection flows into the valve body 100 through the inlet 110 as shown in FIGS. 6 to 8, the first fluid passage hole 216, The passage connecting groove 246 and the second fluid passing hole 236 in this order. At this time, the high-pressure gas that has passed through the first fluid passage hole 216 can not be directly introduced into the second fluid passage hole 236, but hits the outer peripheral wall of the inner seat cage body 232 and then flows along the oil passage connection groove 246 And then escapes into the inner diameter of the inner sheath body 232 through the second fluid passage hole 236. [ Accordingly, the length of the passage of the high-pressure gas is increased, the volume of the high-pressure gas is expanded, and the flow velocity is lowered, so that the primary pressure of the high-pressure gas is reduced.

The first decompressed gas is precisely controlled in accordance with the change of the position of the micro plug 610 along the micro flow path between the pick 250 and the micro plug 610 as shown in FIGS. 6, 9 and 10 Only the microfluid passes and then passes through the inner cylindrical cage 313 of the cylindrical seat cage assembly 300 and the third fluid pass hole 316 of the outer cylindrical cage 312. The gas that has passed through the third fluid passage hole 316 of the innermost cylindrical cage 313 is guided to the inner cylindrical cage 313 after the third fluid passage hole 316 of the innermost cylindrical cage 313 contacts the outer diameter, The first fluid pass hole 316 and the third fluid pass hole 316 of the second fluid pass hole 316 are formed in the same direction as the first fluid pass hole 316, And then sequentially moved in the same manner by the next inner cylindrical cage 313 to finally exit the third fluid passage 316 of the outer cylindrical cage 312 to the discharge section 120. Therefore, the length of the passage is increased by the third fluid holes 316, which are offset from each other, of the cylindrical seat cage assembly 300, and the volume of the first reduced pressure gas is further expanded and the flow velocity is lowered. And the re-liquefied gas is discharged through the discharging unit 120. In this case,

As described above, according to the high-pressure expansion valve for re-liquefying cryogenic high-pressure gas according to the present invention, the stem and the micro plug member can be connected to each other through the structure of the modified side- It is possible to perform precise alignment without interference with the micro flow channel 600, thereby facilitating the opening or closing of the micro flow path for controlling the minute flow rate, and there is no fear of causing wear, breakage or excessive noise.

The high differential pressure expansion valve for re-liquefying cryogenic high pressure gas according to the present invention can precisely control the opening or closing of the micro flow path through the pick 500, the stem, and the micro plug member 600, There is an advantageous effect that the precision flow rate of the differential pressure valve can be controlled.

According to the high-pressure expansion valve for re-liquefaction of cryogenic high-pressure gas according to the present invention, the depressurization cage assembly 200 and the cylindrical cage assembly 300 are provided instead of one decompression cage assembly 200, By reducing the pressure to be reduced through the decompression process, it is possible to reduce the excessive pressure difference before and after the decompression, thereby reducing the wear and noise inducing phenomenon, compared with the structure through one decompression.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

The present invention is a very useful invention that can be widely used in industrial fields related to storage and transportation or fuel use through re-liquefaction of cryogenic high-pressure gas such as liquefied natural gas.

100: valve body 110: inlet
120: discharging part 130: cage accommodating part
200: seat cage assembly 210: outer seat cage
212: outer seat cage body 214: inner seat cage seat
216: first fluid passage hole 230: inner sheet cage
232: Inner seat cage body 233: Lower seat part
234, 274: Micro plug passage hole 236: Second fluid passage hole
238: seat ring member engaging portion 239:
246: channel connection groove 250:
270: seat ring member 272: seat ring body
275: picking receiving groove 276: seat cage engaging groove
277: gasket coupling end
278, 318: upper coupling end 300: cylindrical cage assembly
312: outer cylindrical cage 313: inner cylindrical cage
314, 414, 514: stem passing hole 316: third fluid passing hole
317, 417: lower coupling stage
400: cage spacer 412: spacer body
500: bonnet member 510: bonnet body
512: lower pressing portion 600: stem and micro plug member
610: Micro plug 612: Micro plug body
614: first flow control groove 616: second flow control groove
650: Stem

Claims (5)

A valve body having an inlet portion, a discharge portion and a cage receiving portion,
An outer sheet cage in which a plurality of first fluid passing holes are formed at a predetermined interval, the first fluid passing holes passing through the inner sheet cage receiving hole from an outer diameter of the inner sheet cage receiving hole, A micro plug hole is formed which is coupled to the outer sheet cage in a state in which a part of the micro plug hole is accommodated in the inner sheet cage accommodating hole so as to have a flow path connecting groove with a predetermined spacing therebetween, A plurality of second fluid pass holes penetrating toward the plug passing hole and not positioned in a straight line with the first fluid passing hole are formed at predetermined intervals to form an inner seat cage, a seat ring member coupled to the inner seat cage, The seat cage and the seat ring member A seat cage assembly having a pick located between,
A lower portion fixedly coupled to the upper portion of the seat cage assembly and having an outer cylindrical cage and at least one inner cylindrical cage vertically laterally received within the outer cylindrical cage and having at least one inner cylindrical cage and at least one inner cylindrical cage, Wherein a plurality of third fluid passing holes are formed at predetermined intervals in the radial direction from an outer diameter of the cylindrical cage assembly, ,
A bonnet member fixedly coupled to the valve body in a state where the seat cage assembly and the cylindrical cage assembly are fixedly received in the cage accommodating portion,
A stem accommodating the inside of the seat cage assembly and the cylindrical cage assembly and adjusting a flow rate through the micro flow path by increasing or decreasing the area of the micro flow path by changing the opening ratio between the pick and the up / absence
Containing
High pressure differential expansion valve for re-liquefaction of cryogenic high pressure gas. The method of claim 1,
A stem passing hole is formed in the upper and lower direction within the cylindrical cage assembly,
Cage spacer
Further comprising
High pressure differential expansion valve for re-liquefaction of cryogenic high pressure gas. 3. The method according to claim 1 or 2,
The inner seat cage
Inner seat cage body,
A lower seat portion coupled to a lower portion of the inner seat cage body to close a lower portion of the micro plug hole,
A seat ring member engaging with an upper portion of the inner seat cage body,
Containing
High pressure differential expansion valve for re-liquefaction of cryogenic high pressure gas. 4. The method of claim 3,
The seat ring member
A seat ring body in which a seat cage engaging groove, a pick receiving recess and a micro plug passage hole are sequentially formed from the bottom to the top in a vertical direction,
/ RTI >
The seat cage engaging groove receives the seat ring member engaging portion into the seat ring body,
And the pick receiving groove is formed in the upper portion of the seat cage engaging groove to receive the pick
High pressure differential expansion valve for re-liquefaction of cryogenic high pressure gas. 3. The method of claim 2,
The bonnet member
A bonnet body having a lower pressing portion protruded downward at a lower portion thereof
/ RTI >
And the lower pressurizing portion is in contact with the upper surface of the cage spacer and presses the cage spacer in the downward direction and is fixedly coupled to the upper portion of the valve body
High pressure differential expansion valve for re-liquefaction of cryogenic high pressure gas.

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