KR20230078328A - Valve for cryogenic condition - Google Patents

Abstract

The present invention relates to a pressure reducing valve for cryogenic fluid that maintains a constant pressure by changing the degree of opening of the valve according to the energy of the first cold fluid, an inlet through which the fluid is introduced, and a fluid that has flowed in through the inlet is discharged to the outside. A valve body having an outlet, a nozzle seat mounted on the inlet, a decompression unit mounted on the upper side of the nozzle seat and formed to open and close the nozzle seat as it moves vertically and linearly, coupled to the upper portion of the decompression unit. In the lower part, a holder having an accommodating portion for accommodating the decompression unit is formed, and a guide hole installed on the upper part of the valve body is in close contact with the outer circumferential surface of the holder and guides the holder to move vertically within a certain range. It is characterized in that it comprises a holder guide, a stem provided on the upper side of the holder center and moved in a vertical linear direction, and an elastic unit mounted on an outer circumference of the stem to provide elastic force to the holder and the decompression unit.

Description

Pressure reducing valve for cryogenic fluid {Valve for cryogenic condition}

The present invention relates to a pressure reducing valve for cryogenic fluid, and more particularly, to a pressure reducing valve for cryogenic fluid that maintains a constant pressure by changing the degree of opening of the valve according to the energy of the first cold fluid.

In general, a valve (Globe/Gate) for cryogenic temperature (-196°C) is used to open and close an LNG discharge path in an LNG transport ship or an onshore LNG storage and transportation terminal.

In such a cryogenic valve, a horizontal flow path is formed inside the valve body, and a vertically arranged bonnet is formed on the upper side of the valve body, and the above-described flow path can be opened and closed inside the bonnet and the valve body. The valve shaft is built in with the disk having the valve seat.

In addition, a back seat fitted to the valve shaft is formed at the lower end of the bonnet to prevent the high-pressure fluid generated on the flow path from flowing out through the inside of the bonnet to the outside by the back seat.

Accordingly, when the valve shaft is rotated through a driving means such as a handle or an actuator so that the valve shaft is moved up and down, the disc at the bottom of the valve shaft opens or closes the flow path, and the fluid on the flow path is discharged or discharged to be blocked.

In recent years, the demand for clean energy has increased due to the strengthening of carbon regulations, and in response to this, the transportation of fluid fuels such as liquid gas has emerged as important. In the case of liquid gases, most of them are characterized by maintaining a liquid state at ultra-low temperature and high pressure.

Accordingly, it is required to develop a pressure reducing valve for cryogenic fluid that can withstand cryogenic and high pressure conditions and can stably transfer liquid gas while controlling the flow rate or hydraulic pressure.

Republic of Korea Patent Registration No. 10-0944167 (2010.02.18.)

The present invention has been made to solve the above problems, and an object of the present invention is to expand the pressure reduction range for the inside of the fluid passing through the valve, and to provide a pressure reducing valve for cryogenic fluid applicable to cryogenic fluid used in special fields. is to provide

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the present invention provides a valve body having an inlet through which fluid flows in and an outlet through which the fluid introduced through the inlet is discharged to the outside, a nozzle seat mounted on the inlet, and the nozzle seat. A decompression unit mounted on an upper side and formed to open and close the nozzle seat as it moves vertically, a holder coupled to an upper portion of the decompression unit and having a receiving portion accommodating the decompression unit at a lower portion, and the valve body A holder guide installed on the upper part of the holder, in close contact with the outer circumferential surface of the holder and having a guide hole for guiding the holder to move up and down linearly within a certain range, a stem provided on the upper side of the center of the holder and moved in a vertical linear direction, and and an elastic unit mounted on the outer circumference of the stem to provide elastic force to the holder and the decompression unit.

In addition, the pressure reducing unit includes a diaphragm coupled to the inner surface of the valve body and formed in a ring shape, a plate coupled to the inner surface of the diaphragm and having a through hole formed in the center to which the holder is coupled, and the diaphragm at regular intervals. It is disposed and characterized in that it comprises a sensor member for measuring the pressure and temperature of the fluid.

In addition, the decompression unit is coupled to the through hole, characterized in that it further comprises a packing member for preventing the fluid flowing into the inlet from flowing into the holder.

In addition, the valve body includes a fixing member protruding from an inner surface and having a coupling groove in which one end of the diaphragm is accommodated, and the plate is recessed inward on an outer circumferential surface and fixed in which the other end of the diaphragm is accommodated. It is characterized in that a groove is formed.

In addition, the diaphragm is characterized in that a curved portion inclined upward from the edge toward the center is formed.

In the present invention, the decompression unit is reciprocated up and down by the fluid flowing into the inlet to open and close the nozzle seat to reduce the pressure of the fluid and discharge it to the outlet, thereby reducing the fluid pressure and inducing stable operation through a simple press-in structure. provides an effect.

In addition, the pressure reducing unit reduces the area of the diaphragm through a diaphragm coupled to the inner surface of the valve body and a plate formed on the inner surface of the diaphragm and having excellent low-temperature characteristics, so that the stem and elastic unit are stable in the vertical movement, and have durability against low-temperature fluids. provides an enhancing effect.

In addition, a packing member is installed on the inner circumferential surface of the coupling hole coupled to the holder at the center of the plate to provide an effect of preventing fluid from entering between the holder and the decompression unit.

In addition, since the diaphragm and the plate are fitted and coupled to the fixing member protruding from the inside of the valve body, even if the pressure reducing unit is corroded or destroyed, it provides an effect of easy replacement.

In addition, the diaphragm has a curved portion that gradually slopes upward from the edge to the center, thereby providing an effect of improving durability due to the pressure of the fluid flowing into the inlet.

1 is a cross-sectional view showing a pressure reducing valve for cryogenic fluid according to a preferred embodiment of the present invention.
2 is a top view showing a decompression unit according to a preferred embodiment of the present invention.
3 is a side view showing a decompression unit according to a preferred embodiment of the present invention.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims.

With reference to the accompanying drawings below, specific details for the practice of the present invention will be described in detail. Like reference numbers refer to like elements, regardless of drawing, and "and/or" includes each and every combination of one or more of the recited items.

Although first, second, etc. are used to describe various components, these components are not limited by these terms, of course. These terms are only used to distinguish one component from another. Accordingly, it goes without saying that the first component mentioned below may also be the second component within the technical spirit of the present invention.

Terms used in this specification are for describing the embodiments and are not intended to limit the present invention. In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase. As used herein, "comprises" and/or "comprising" does not exclude the presence or addition of one or more other elements other than the recited elements.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used in a meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless explicitly specifically defined.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing a pressure reducing valve for cryogenic fluid according to a preferred embodiment of the present invention.

As shown in FIG. 1, the pressure reducing valve 1000 for cryogenic fluid of the present invention includes a valve body 100, a nozzle seat 200, a pressure reducing unit 300, a holder 400, a holder guide 500, a stem (600) and an elastic unit (700).

First, the valve body 100 corresponds to a body constituting the pressure-reducing valve 1000 for cryogenic fluid of the present invention, and an inlet 110 through which fluid flows is formed at the bottom and communicates with the inlet 110. An outlet 120 through which the fluid introduced through the inlet 110 is discharged to the outside is formed.

At this time, the valve body 100 is connected to a conduit through which the fluid flows, and a flow path is formed therein, and an inlet 110 and an outlet 120 are formed, and the fluid flowing through the inlet 110 is discharged through the outlet. It is discharged to the outside of the valve body 100 through 120.

The nozzle sheet 200 is mounted on the inlet 110 and is formed to be opened and closed while the decompression unit 300 is moved up and down by the fluid flowing in from the inlet 110 .

Next, the decompression unit 300 is for opening and closing the nozzle seat 200 mounted on the inlet 110 of the valve body 100, and is mounted on the upper side of the nozzle seat 200 and moves vertically up and down the nozzle. The sheet 200 is opened and closed.

Here, the decompression unit 300 opens and closes the nozzle sheet 200 while contacting or being separated from the upper surface of the nozzle sheet 200 to discharge the fluid flowing into the inlet 110 through the outlet 120. , It will be described in detail with reference to FIGS. 2 and 3 to be described later.

Next, the holder 400 is coupled to an upper portion of the decompression unit 300, and a receiving portion in which the decompression unit 300 is accommodated is formed at the lower portion so that the decompression unit 300 moves upward to a predetermined position. limit the escape.

At this time, the holder guide 500 is for guiding the holder 400 to move up and down linearly within a certain range, is installed on the upper part of the valve body 100, and is in close contact with the outer circumferential surface of the holder 400, A guide hole for guiding the holder 400 to move up and down linearly within a certain range is formed, and the holder 400 moves along the guide hole.

Next, the stem 600 is provided on the upper side of the center of the holder 400 and moves in an up and down linear direction, and the holder 400 and the decompression unit 300 are interlocked by the up and down movement of the stem 600 to move up and down. are moved

At this time, elastic force is applied to the holder 400 and the decompression unit 300 by the elastic unit 700 mounted on the outer circumference of the stem 600 .

Also, the elastic unit 700 may be made of a spring, and is not limited to any material that provides elastic force to the holder 300 and the decompression unit 300 .

In addition, the pressure reducing valve 1000 for cryogenic fluid of the present invention may further include a bonnet 700 and a lifting unit 800.

Here, the bonnet 800 is mounted coupled to the upper portion of the valve body 100, and the stem 600 and the elastic unit 700 are accommodated therein.

And the lifting unit 900 is connected to the top of the stem 600 exposed to the outside of the bonnet 700 to manually move the stem 600 up and down, coupled to the top of the bonnet 700 It consists of a lifting lever cap 910 and a lifting lever 920 rotatably coupled to the lifting lever cap 910 .

Next, the pressure reducing unit 300 of the pressure reducing valve 1000 for cryogenic fluid according to the present invention will be described in detail with reference to FIGS. 2 and 3 .

2 is a top view showing a decompression unit according to a preferred embodiment of the present invention, and FIG. 3 is a side view showing a decompression unit according to a preferred embodiment of the present invention.

As shown in FIGS. 2 and 3 , the pressure reducing unit 300 includes a diaphragm 310 , a plate 320 , a sensor member 330 and a packing member 340 .

First, the diaphragm 310 is coupled to the inner surface of the valve body 100 and is formed in a ring shape.

At this time, the outer surface of the diaphragm 310 is coupled along the inner circumferential surface of the valve body 100, and the plate 320 is coupled to the inner surface.

In addition, the diaphragm 310 has a curved portion 311 that is inclined upward from the edge to the center.

Here, the curved portion 311 is gradually curved upward from both ends of the diaphragm 310 toward the center to reduce the pressure of the fluid introduced from the inlet 110 formed in the lower part of the valve body 100 be able to

In addition, the plate 320 is coupled to the inner surface of the diaphragm 310 and a through hole 321 is formed in the center so that the lower surface of the holder 400 is fitted.

At this time, the plate 320 is made of a metal or ceramic material that is highly resistant to cryogenic fluid.

Here, the plate 320 may be made of a compound obtained by combining at least one of stainless steel, nickel, alloy, and metal, which are materials having excellent low-temperature characteristics.

Accordingly, the plate 320 is disposed on the inner surface of the diaphragm 310, and the contact area of the diaphragm 310 from the fluid flowing into the inlet 110 is reduced to improve durability against low-temperature fluid. .

In addition, the diaphragm 310 and the plate 320 are stably fixed to the inner surface of the valve body 100, and the inner surface of the valve body 100 has a coupling groove 131 in which one end of the diaphragm 310 is accommodated. ) The fixing member 130 formed is protruded.

Further, the outer circumferential surface of the plate 320 is recessed inward, and a fixing groove 321 accommodating the other end of the diaphragm 310 is formed.

At this time, the diaphragm 310 is inserted into the coupling groove 131 and the fixing groove 321, respectively, and the diaphragm 310 and the plate 320 are attached to the fixing member 130 protruding from the inside of the valve body 100. Since it is configured to be fitted, it has the advantage of being easy to replace even if it is corroded or destroyed due to frequent use.

The sensor member 330 is disposed at regular intervals on the diaphragm 310 and measures the pressure and temperature of the fluid.

Here, the sensor members 330 are arranged at regular intervals along the arc shape of the diaphragm 310 to measure the pressure and temperature of the fluid introduced from the inlet 110 and to detect fluid leakage.

The plurality of sensor members 330 formed in the diaphragm 310 may measure the pressure and temperature of the fluid, respectively, to improve measurement accuracy of the temperature and pressure of the fluid flowing into the inlet 110 .

In addition, the packing member 340 is coupled to the through hole 321 and coupled to the inner surface of the plate 320 to prevent the fluid flowing into the inlet 110 from flowing into the holder 400. do.

Accordingly, the packing member 340 is installed on the inner circumferential surface of the coupling hole 321 coupled to the holder 400 at the center of the plate 320 to prevent fluid from flowing into the holder 400 and the elastic unit 700. can

Although the embodiments of the present invention have been described with reference to the above and accompanying drawings, those skilled in the art to which the present invention pertains can implement the present invention in other specific forms without changing the technical spirit or essential features. You will understand that there is Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

1000: pressure reducing valve for cryogenic fluid
100: valve body
110: inlet
120: outlet
130: fixed member
200: nozzle seat
300: decompression unit
310: diaphragm
311: curved portion
320: plate
321: through hole
322: fixed groove
330: sensor member
340: packing member
400: holder
500: holder guide
600: stem
700: elastic unit
800: bonnet
900: lifting unit
910: lifting lever cap
920: lifting lever

Claims (5)

A valve body having an inlet through which fluid flows and an outlet through which the fluid introduced through the inlet is discharged to the outside;
a nozzle seat mounted on the inlet;
a decompression unit mounted on the upper side of the nozzle sheet and configured to open and close the nozzle sheet as it linearly moves up and down;
a holder coupled to an upper portion of the decompression unit and having an accommodating portion in the lower portion of which the decompression unit is accommodated;
a holder guide installed on an upper portion of the valve body, in close contact with an outer circumferential surface of the holder, and having a guide hole for guiding the holder to linearly move up and down within a certain range;
a stem provided on the upper side of the center of the holder and moved in a straight up and down direction; and
An elastic unit mounted on the outer circumference of the stem to provide elastic force to the holder and the pressure reducing unit; a pressure reducing valve for cryogenic fluid comprising a.
According to claim 1,
The decompression unit,
A diaphragm coupled to the inner surface of the valve body and formed in a ring shape, a plate coupled to the inner surface of the diaphragm and having a through hole formed in the center to which the holder is coupled, and a plate disposed on the diaphragm at regular intervals and having a pressure of the fluid and a sensor member for measuring temperature.
According to claim 2,
The decompression unit,
The pressure reducing valve for cryogenic fluid further comprising a packing member coupled to the through hole and preventing the fluid flowing into the inlet from flowing into the holder.
According to claim 2,
The valve body,
A fixing member protruding from the inner surface and having a coupling groove in which one end of the diaphragm is received is formed,
The plate is
A pressure reducing valve for cryogenic fluid, characterized in that the outer circumferential surface is recessed inward and a fixing groove in which the other end of the diaphragm is accommodated is formed.
According to claim 2,
The diaphragm,
A pressure reducing valve for cryogenic fluid, characterized in that a curved portion inclined upward from the edge to the center is formed.

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