KR101513089B1

KR101513089B1 - A control valve for cryogenic high pressure gas which having inflatable sealing member

Info

Publication number: KR101513089B1
Application number: KR1020140044622A
Authority: KR
Inventors: 최영환; 김규철; 석승훈
Original assignee: 주식회사 코밸
Priority date: 2014-04-15
Filing date: 2014-04-15
Publication date: 2015-04-21

Abstract

The present invention is characterized by comprising: a valve body (10) provided with gas inlet passages (12) and gas outlet passages (16) on both sides; A bonnet 20 provided at an upper portion of the valve body 10; A gas inflow hole 32 formed at one side of the valve body 10 and communicating with the gas inflow path 12 of the valve body 10 and a gas vent hole 32 formed at the other side and communicating with the gas discharge path 16 of the valve body 10 A cage 30 provided on the central passage 14 of the valve body 10; A plurality of first vertical through holes 44 formed to be spaced apart from each other by a predetermined distance and a stepped groove 46 formed in an annular shape at a corner of the upper surface, A plug (40) inserted into the plug (30); And a plurality of second vertical through holes 54 formed so as to communicate with the first vertical through holes 44 of the plug 40 are provided on the upper surface of the plug 40, A pressure plate (50) coupled thereto; A stem 60 positioned on the central axis of the bonnet 20 and having an extended end fixedly coupled to the central axis of the plug 40; A sealing member (70) having a cross section of the ∩ structure and inserted into the stepped groove (46) of the plug (40); A control valve for cryogenic ultra-high pressure gas is provided.

Description

Technical Field The present invention relates to a control valve for cryogenic high pressure gas,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a control valve for ultra-low temperature ultra-high pressure gas, and more particularly, to a control valve which can further secure the closed state of the valve by using the pressure of gas filled in the pipe, .

Valves that control cryogenic ultra-high pressure gas are widely used in LNG carrier and aerospace applications and are specifically designed to operate in extreme environments. Such a valve must satisfy conditions such as good toughness, good weldability and workability, corrosion resistance to a fluid to be used in its material, and maintain excellent airtightness in a cryogenic environment and further ensure smooth operation.

However, most of the valves used in the field are not developed to be used under the conditions of cryogenic temperature and super high pressure, so that frequent gas leakage accidents occur, and explosion accident occurs due to valve damage or breakage. Among the proposed techniques to solve such a problem, there is Korean Patent No. 0978061.

This technique focuses on improving the technology between the plug and the seat which form the contact point while opening and closing the flow path inside the valve body. In other words, as shown in Fig. 3, by proposing a configuration in which the sheets 12 and 13 are arranged in the upper and lower portions of the plug 3 that opens the flow path inside the valve body, And more stable airtightness is maintained in a closed state.

However, when the valve is closed by the plug, the portion receiving the highest pressure in the valve body internal passage is a portion of the plug exposed in the direction of the gas inlet, and the plug receives a high pressure fluid pressure vertically. However, when the high pressure acts vertically on the plug portion, it is difficult to easily maintain the airtightness by simply arranging the sheet vertically and vertically. Therefore, an improvement strategy is needed.

Korean Patent No. 0929802, Korean Patent No. 0978061

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the related art, and it is an object of the present invention to provide a control system for a cryogenic super high pressure gas control Valve.

In order to achieve the above object, the present invention provides a valve body (10) having a gas inlet (12) and a gas outlet (16) on both sides thereof; A bonnet 20 provided at an upper portion of the valve body 10; A gas inflow hole 32 formed at one side of the valve body 10 and communicating with the gas inflow path 12 of the valve body 10 and a gas vent hole 32 formed at the other side and communicating with the gas discharge path 16 of the valve body 10 A cage 30 provided on the central passage 14 of the valve body 10; A plurality of first vertical through holes 44 formed to be spaced apart from each other by a predetermined distance and a stepped groove 46 formed in an annular shape at a corner of the upper surface, A plug (40) inserted into the plug (30); And a plurality of second vertical through holes 54 formed so as to communicate with the first vertical through holes 44 of the plug 40 are provided on the upper surface of the plug 40, A pressure plate (50) coupled thereto; A stem 60 positioned on the central axis of the bonnet 20 and having an extended end fixedly coupled to the central axis of the plug 40; A sealing member (70) having a cross section of the ∩ structure and inserted into the stepped groove (46) of the plug (40); And the present invention is characterized in that it includes the technical features.

A synthetic resin body 72 having an open structure cell is interposed in the sealing member 70 and an annular support wire 74 can be inserted through the synthetic resin body 72.

According to the present invention, a through hole is formed in each of the plug and the pressure plate that ascend and descend in the cage, and in addition, an inflatable sealing member is provided on one side of the plug to press the high pressure gas flowing through the through- The valve can be easily closed by the force, and furthermore, the sealing member is inflated by the high-pressure gas so as to be brought into close contact with the inner surface of the cage so that the closed state of the valve can be made more complete.

1 is a schematic cross-sectional structural view of a control valve according to the present invention;
2 is a schematic operational construction diagram of a control valve according to the present invention.
3 is a block diagram of a conventional control valve for ultra-low temperature ultra-high pressure gas.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the technical features of the present invention, A detailed description thereof will be omitted.

1 is a schematic cross-sectional view of a control valve according to the present invention. The valve body 10 includes a valve body 10, a bonnet 20, a cage 30, a plug 40 and a pressure plate 50, a stem 60, , And a sealing member (70). Each of these configurations will be described in detail.

A gas inflow passage 12 and a gas discharge passage 16 are provided on both sides of the valve body 10 and a central passage 14 communicating with the gas inflow passage 12 and the gas discharge passage 16, ).

A bonnet 20 is provided at an upper portion of the valve body 10. The bonnet 20 seals the central passage 14 of the valve body 10 and is tightly fastened to the valve body 10 by fastening means such as the bolts shown.

The cage 30 is a part for guiding the vertical movement of the plug 40 and is mounted on the central flow passage 14 of the valve body 10. Gas inflow holes 32 and gas discharge holes 36 are formed on both sides of the cage 30. The gas inlet hole 32 communicates with the gas inlet passage 12 and the gas outlet hole 36 communicates with the gas outlet passage 16.

The plug 40 is a portion that vertically ascends and descends along the inner surface of the cage 30 and opens and closes the flow path of the valve body 10. The plug 40 includes an open end 42, a first vertical through hole 44, a stepped groove 46, And is inserted into the cage 30. The open / close end 42 is protruded downward by a predetermined length as a means for opening / closing the gas inlet hole 32 and the gas outlet hole 36 of the cage 30. The first vertical through holes 44 are passages through which high-pressure gas moves, and a plurality of the vertical through holes 44 are formed at a predetermined interval. The stepped groove 46 is annularly formed on the upper surface corner portion of the plug 40, and the sealing member 70 is inserted.

The pressure plate 50 is fixedly coupled to the upper portion of the plug 40, and the inclined surface 52 and the second vertical through hole 54 are formed. The inclined surface 52 is preferably formed in an annular shape along the upper edge corner portion, and functions to allow the high-pressure gas to move easily. It is preferable that the second vertical through hole 54 is a moving passage for the high pressure gas and communicates with the first vertical through hole 44 of the plug 40. [ The platen can be tightly coupled to the plug by fastening means such as bolts.

The stem (60) is located on the center axis of the bonnet (20), and one end portion thereof is fixedly coupled to the central axis of the plug (40). With this arrangement, when the drive motor (not shown) is operated, the stem 60 vertically lifts and lowers the plug 40. Further, since the pressure plate 50 is tightly coupled to the plug 40, when the plug 40 vertically ascends and descends, the pressure plate 50 also vertically moves up and down together.

The sealing member 70 is a means for keeping the airtight when the valve is in the closed state, and is inserted into the stepped groove 46 of the plug 40. The present invention proposes that the cross-sectional structure of the sealing member (70) is in the shape of a circle. The reason for suggesting the cross-section of the sealing member with this structure is to induce the inflow of the high-pressure gas through the downward direction. The sealing member 70 is preferably made of an elastic material such as rubber or synthetic resin so as to be inflated by the inflowing high-pressure gas.

The present invention does not exclude the case where the synthetic resin body 72 and the support wire 74 are interposed in the sealing member 70. [ The synthetic resin body 72 preferably has a structure having cells having an open structure like a conventional sponge. The support wire 74 may be made of metal or synthetic resin as a means for supporting the sealing member and the synthetic resin body, and is preferably annular like a sealing member.

The operation configuration of the present invention having such a configuration will be schematically described with reference to the above description and FIG. 2 attached hereto.

If it is necessary to close the flow path of the valve while the high-pressure fluid moves freely through the valve, the drive motor operates according to the input signal of the control device not shown. When the drive motor is operated, the stem 60 is slowly lowered so that the open / close end 42 of the plug 40 gradually closes the gas inflow hole 32 and the gas discharge hole 36 of the cage 40 . When the stem 60 is completely lowered, the valve is closed and the high-pressure gas P is stagnated in the vicinity of the gas inflow path 12 of the valve body 10.

When the high-pressure gas stagnates in the space in the gas inlet path 12, some of the high-pressure gas due to the pressure causes the first vertical through-hole 44 of the plug 40 and the second vertical through- 54, and flows into the space of the central passage 14 of the valve body 10, more specifically, the space above the pressure plate 50. [ The gas sequentially introduced into the upper space of the pressure plate 50 presses the pressure plate 50 downward at a value equal to the stagnated gas pressure P in the vicinity of the gas inflow path 12. [ As a result, the closed state of the valve is maintained more solidly.

At the same time, a part of the high-pressure gas introduced into the upper space of the pressure plate 50 is moved through the gap between the inclined surface 52 of the pressure plate 50 and the inner surface of the cage 30 and the sealing member 70, And flows into the sealing member 70 through the lower portion of the sealing member 70. Since the sealing member 70 is made of an elastic material and the synthetic resin body 72 interposed in the sealing member 70 is formed of a cell having an open structure, The sealing member expands due to the pressure of the gas and tightly adheres to each of the one side surface of the stepped groove 46 of the plug 40, the bottom edge of the pressure plate 50, and the inner surface of the cage 30 .

That is, the portion of the central flow passage 14 of the valve body 10 is completely disconnected from the gas discharge passage 16, and the valve becomes more completely sealed. As described above, according to the present invention, the high-pressure gas is introduced through the through-holes of the plug and the pressure plate, and the pressing plate is pressed with a certain force to induce the valve to be easily closed. In addition, So that a more complete closed state of the valve can be realized.

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 embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. It will be apparent that the present invention can be practiced with added features.

10: Valve body 20: Bonnet
30: Cage 40: Plug
50: pressure plate 60: stem
70: Sealing member

Claims

A valve body 10 having gas inflow paths 12 and gas discharge paths 16 on both sides thereof;
A bonnet 20 provided at an upper portion of the valve body 10;
A gas inflow hole 32 formed at one side of the valve body 10 and communicating with the gas inflow path 12 of the valve body 10 and a gas exhaust hole 32 formed at the other side and communicating with the gas exhaust path 16 of the valve body 10 A cage 30 provided on the central passage 14 of the valve body 10;
A plurality of first vertical through holes 44 formed to be spaced apart from each other by a predetermined distance and a stepped groove 46 formed in an annular shape at a corner of the upper surface, A plug (40) inserted into the plug (30);
And a plurality of second vertical through holes 54 formed so as to communicate with the first vertical through holes 44 of the plug 40 are provided on the upper surface of the plug 40, A pressure plate (50) coupled thereto;
A stem 60 positioned on the central axis of the bonnet 20 and having an extended end fixedly coupled to the central axis of the plug 40;
A sealing member (70) having a cross section of the ∩ structure and inserted into the stepped groove (46) of the plug (40);
And a control valve for controlling the cryogenic ultra-high pressure gas.

The method according to claim 1,
Characterized in that a synthetic resin body (72) having an open structure cell is interposed in the sealing member (70) and an annular support wire (74) is inserted into the synthetic resin body (72) Control valve.