KR102697136B1 - Flow control valve - Google Patents

Abstract

An invention for a flow control valve is disclosed. The disclosed flow control valve comprises: a valve body having a fluid inlet, a fluid outlet, and a fluid channel; a seat installed in the fluid channel and having a seat surface and a seat passage; a stem inserted and installed in the valve body so as to be able to move up and down; and a stem head provided at a tip of the stem and capable of contacting the seat surface of the seat by the up and down movement of the stem, wherein the stem head comprises a sliding guide having a diameter corresponding to the diameter of the fluid channel so as to have a gap to enable the up and down movement in the fluid channel, and a conical portion formed at an end of the sliding guide to open and close the seat surface when the valve is raised and lowered, and the sliding guide forms a plurality of flow cross-sections for allowing a fluid having a wider cross-section area (D1) than the cross-section area (D2) of the seat passage to pass therethrough, thereby reducing fluid loss due to the stem head even at a small opening and preventing bending of the stem due to a high differential pressure.

Description

Flow Control Valve {FLOW CONTROL VALVE}

The present invention relates to a flow control valve, and more specifically, to a flow control valve capable of controlling a flow rate at a constant level from a micro flow rate to a large flow rate.

In general, as valves, globe valves, sluice valves, ball valves, etc. are conventionally known, and the optimal structure is selected depending on the type of fluid or usage conditions (chemical or physical properties (temperature, pressure)).

In particular, a valve for controlling the flow of high-pressure fluid includes a body portion formed by processing a metal material, a seat portion formed inside the body portion, and a stem that is controlled by the operation of a handle or a driving unit and is in close contact with the seat portion to open and close the flow of fluid.

The stem is inserted into the fluid passage formed in the body and moves up and down through screw connection to come into close contact with the sealing surface of the seat passage to block the fluid, and the flow rate of the fluid is controlled by adjusting the gap between the stem and the sealing surface of the seat passage.

However, conventionally, the stem of a regulating valve for flow control has a conical stem head, and the conical stem head obstructs the flow of fluid. In order to eliminate this obstruction, the pipes on the inlet and outlet sides of the valve have no choice but to be located between the tangential surfaces of the conical portions, and this restriction shortens the up-and-down movement orbit of the valve, thereby limiting the valve flow rate and narrowing the range of micro-flow rate and flow control.

In addition, valves with straight stems are being manufactured to eliminate these limitations, but it is difficult to apply them as valves that control large amounts of fluid because it is difficult for the fluid to escape between the stem and the flow passage.

Therefore, there is a need to improve this.

Related background technology includes Korean Patent Publication No. 2015797 (August 23, 2019, Title of the invention: Valve).

The present invention was created in response to the above-mentioned need, and its purpose is to provide a flow control valve capable of controlling the flow rate at a constant level from a micro-flow rate to a large flow rate.

In addition, the present invention aims to provide a flow control valve capable of preventing a stem from bending due to a fluid flow and minimizing flow loss on the inlet side.

In addition, the present invention aims to provide a flow control valve configured to form a plurality of flow cross-sections in a sliding guide of a stem head so as to allow a greater amount of fluid to pass through the seat path than the amount of fluid passing through it.

In addition, the present invention aims to provide a flow control valve that can control the flow rate discharged from the seat channel according to the up and down movement of the stem head by forming a protrusion at the end of the stem head cone and partially inserting it into the seat channel.

In order to achieve the above object, the flow control valve according to the present invention comprises: a valve body having a fluid inlet, a fluid outlet, and a fluid channel; a seat installed in the fluid channel and having a seat surface and a seat passage; a stem inserted and installed in the valve body so as to be able to move up and down; and a stem head provided at a tip of the stem and capable of contacting the seat surface of the seat by the up and down movement of the stem, wherein the stem head comprises a sliding guide having a diameter corresponding to a diameter of the fluid channel so as to have a gap so as to be able to move up and down in the fluid channel, and a conical portion formed at an end of the sliding guide to open and close the seat surface when raised and lowered, and the sliding guide forms a plurality of flow cross-sections for allowing a fluid having a wider cross-section area (D1) than the cross-section area (D2) of the seat passage to pass therethrough, thereby reducing fluid loss due to the stem head even at a small opening while preventing bending of the stem due to a high differential pressure.

The above conical portion is provided with a protrusion that is inserted into the seat channel and controls the flow rate of the fluid according to the amount of up-and-down movement of the stem, and the protrusion is formed in at least one of a triangular vertex shape formed at an end of the conical portion, or a protrusion shape extended from the end of the conical portion; and the contact portion of the seat surface is formed in a round shape and is characterized by making line contact with the end face of the conical portion to form an airtight seal.

In the case where the above protrusion is in the form of a projection, a narrow portion is provided whose diameter gradually narrows from the starting point of the cone to the end, and the protrusion is inserted into the seat channel and is spaced apart from the inner diameter surface of the seat channel by a set distance, thereby enabling fluid movement.

The flow control valve according to the present invention can control the flow rate constantly from a micro flow rate to a large flow rate.

In addition, the present invention can prevent the stem from bending due to the flow of fluid and minimize the loss of flow rate on the inlet side.

In addition, the present invention can be configured to form a plurality of fluid cross-sections in the sliding guide of the stem head so as to allow a greater amount of fluid to pass through the seat path.

In addition, the present invention can control the amount of fluid discharged from the seat channel according to the up-and-down movement of the stem head by forming a protrusion at the end of the stem head cone and inserting a portion of the protrusion into the seat channel.

Figure 1 is a perspective view of the exterior of a flow control valve according to one embodiment of the present invention.
FIG. 2 is a cross-sectional view of a main portion having a protrusion in the form of a projection in a flow control valve according to one embodiment of the present invention.
FIG. 3 is an exploded perspective view of a main body of a flow control valve according to one embodiment of the present invention, having a protrusion in the form of a projection at the conical end of the stem head.
Figure 4 is a partial cross-sectional view of Figure 3.
FIG. 5 is a cross-sectional view showing a state in which a stem head and a protrusion-shaped projection move up and down in a fluid passage and a seat passage in a flow control valve according to one embodiment of the present invention.
FIG. 6 is a cross-sectional view showing a state in which a conical portion of a stem head is in close contact with a seat surface and the fluid is blocked while a protrusion in the form of a projection is inserted into a seat passage in a flow control valve according to one embodiment of the present invention.
FIG. 7 is a drawing showing a state in which the cross-sectional area of a flow section of a sliding guide having a protrusion in the form of a projection is larger than the cross-sectional area of a seat passage in a flow control valve according to one embodiment of the present invention.
FIG. 8 is a cross-sectional view of a main portion having a protrusion in the shape of a triangular vertex in a flow control valve according to one embodiment of the present invention.
FIG. 9 is an exploded perspective view of a main body of a flow control valve according to one embodiment of the present invention, wherein a conical end of a stem head has a protrusion in the shape of a triangular vertex.
Figure 10 is a partial cross-sectional view of Figure 9.
FIG. 11 is a cross-sectional view showing a state in which a stem head and a triangular vertex-shaped protrusion move up and down in a fluid passage and a seat passage in a flow control valve according to one embodiment of the present invention.
FIG. 12 is a cross-sectional view showing a state in which a conical portion of a stem head is in close contact with a seat surface and a fluid is blocked while a protrusion in the shape of a triangular vertex is inserted into a seat passage in a flow control valve according to one embodiment of the present invention.
FIG. 13 is a drawing showing a state in which the cross-sectional area of a flow section of a sliding guide having a protrusion in the shape of a triangular vertex is larger than the cross-sectional area of a seat passage in a flow control valve according to one embodiment of the present invention.

Hereinafter, a flow control valve according to one embodiment of the present invention will be described with reference to the attached drawings.

In this process, the thickness of the lines depicted in the drawing and the size of the components may be exaggerated for the sake of clarity and convenience of explanation. In addition, the terms described below are terms defined in consideration of their functions in the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, the definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 is a perspective view of an exterior of a flow control valve according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a main part of a flow control valve according to an embodiment of the present invention having a protrusion in the form of a projection, FIG. 3 is an exploded perspective view of a main part of a flow control valve according to an embodiment of the present invention having a protrusion in the form of a projection at an end of a conical part of a stem head, FIG. 4 is a partial cross-sectional view of FIG. 3, FIG. 5 is a cross-sectional view showing a state in which a stem head and a protrusion in the form of a projection move up and down in a fluid channel and a seat channel in a flow control valve according to an embodiment of the present invention, FIG. 6 is a cross-sectional view showing a state in which a conical part of a stem head is in close contact with a seat surface while the protrusion in the form of a projection is inserted into a seat channel in a state in which the fluid is blocked in a state in which a flow control valve according to an embodiment of the present invention has a cross-sectional area of a fluid section of a sliding guide having a protrusion in the form of a projection larger than a cross-sectional area of a seat channel.

FIG. 8 is a cross-sectional view of a main part having a triangular apex-shaped protrusion according to an embodiment of the present invention, FIG. 9 is an exploded perspective view of a main part having a triangular apex-shaped protrusion at an end of a conical portion of a stem head according to an embodiment of the present invention, FIG. 10 is a partial sectional view of FIG. 10, FIG. 11 is a cross-sectional view showing a state in which a stem head and a triangular apex-shaped protrusion move up and down in a fluid passage and a seat channel in a flow control valve according to an embodiment of the present invention, FIG. 12 is a cross-sectional view showing a state in which a conical portion of a stem head is in close contact with a seat surface while a triangular apex-shaped protrusion is inserted into a seat channel in a flow control valve according to an embodiment of the present invention to block fluid, and FIG. 13 is a drawing showing a state in which a cross-sectional area of a fluid section of a sliding guide having a triangular apex-shaped protrusion is larger than a cross-sectional area of a seat channel in a flow control valve according to an embodiment of the present invention.

Referring to FIGS. 1 to 13, a flow control valve according to one embodiment of the present invention includes a valve body (10), a seat (20), a stem (30), and a stem head (40).

The valve body (10) is configured to have a fluid inlet (12), a fluid outlet (14), and a fluid line (16).

The fluid inlet (12) may be formed at the lower portion of the valve body (10), and the fluid outlet (14) may be formed at the upper portion of the valve body (10) compared to the fluid inlet (12).

The sheet (20) is installed in the fluid line (16) and has a sheet surface (22) and a sheet path (24). The sheet (20) is made of a soft material and can enhance airtightness.

The stem (30) is configured to be inserted and installed in the valve body (10) so as to be able to move up and down.

The stem head (40) is provided at the tip of the stem (30) and is configured to be in contact with the seat surface (22) of the seat (20) by the up-and-down movement of the stem (30) operated by the driving unit (2).

The stem head (40) may be formed of a sliding guide (42) having a diameter corresponding to the diameter of the fluid line (16) so as to have a gap to allow vertical movement in the fluid line (16), and a conical portion (44) formed at the end of the sliding guide (42) to open and close the seat surface (22) when moving up and down.

The sliding guide (42) may be configured to have a plurality of fluid cross-sections (43) cut and formed on a cylindrical stem head (40), and the uncut curved portion may be configured to be in close contact with the inner diameter surface of the fluid conduit (16) so as to have a set gap and to move up and down by the stem (20).

The cone portion (44) can be integrally formed in the shape of a cone protrusion at the lower portion of the sliding guide (42).

Referring to FIG. 7 and FIG. 13, the sliding guide (42) forms a plurality of fluid cross-sections (43) for passing a fluid having a wider cross-sectional area (D1) than the cross-sectional area (D2) of the seat passage (24), thereby reducing fluid loss due to the stem head (40) even at a small opening and preventing bending of the stem (20) due to high differential pressure.

The sliding guide (42) has a plurality of arc-shaped curved portions corresponding to the inner diameter of the fluid conduit (16) and can be configured to move up and down while having a minute gap on the inner surface of the fluid conduit (16).

Accordingly, the sliding guide (42) moves up and down without flowing left and right in the fluid conduit (14), thereby preventing the stem (20) from bending (buckling) due to high differential pressure even if resistance is applied to the cone (44) and the sliding guide (42) by the fluid moving upward through the sheet passage (24).

As shown in FIG. 7 and FIG. 13, the spacing (S2) of the fluid cross-section (43) of the sliding guide (42) can have a range of 3 to 4 times the spacing (S1) of the curvature section of the sliding guide (42).

Accordingly, the plurality of curved sections of the sliding guide (42) are arranged at narrow intervals (S1) on the inner diameter of the fluid conduit (16) and are in close contact with each other with a fine gap while moving up and down, and the fluid is moved through the fluid cross-section section (43) arranged at wide intervals (S2) while having a relatively wider cross-sectional area (D1) than the cross-sectional area (D2) of the sheet path (24), thereby preventing the flow of the stem head (40) due to the resistance of the fluid and thereby preventing the stem (20) connected to the upper side from bending (buckling).

The cone (44) may be provided with a protrusion (46) that is inserted into the seat path (24) and controls the flow rate of the fluid according to the amount of up and down movement of the stem (20).

The protrusion (46) may be formed in at least one of a triangular vertex shape formed at the end of the conical portion (44), or a protrusion shape formed by extending from the end of the conical portion (44).

Referring to FIGS. 2 to 7, a protrusion (46) in the shape of a protrusion is illustrated, and referring to FIGS. 8 to 13, a protrusion (46) in the shape of a triangular vertex is illustrated.

The contact portion of the sheet surface (22) can be formed in a round shape and sealed by making line contact with the end face of the cone portion (44).

Referring to FIG. 6 and FIG. 12, when the end of the protrusion (46) is inserted into the seat passage (24) of the seat (20), the conical portion (44) is in close contact with the dotted portion of the seat surface (22) to maintain a sealed state.

As a result, the fluid is prevented from moving through the circumference of the cone (44) and the fluid cross-section (43) of the sliding guide (42) and being discharged to the fluid outlet (14).

Meanwhile, even if the stem head (40) is slightly tilted, the conical portion (44) can always be sealed by line contact with the rounded sheet surface (22), and since line contact has a better contact force than surface contact, the sealing can be improved.

In the case of the protrusion (46) in the form of a projection, a narrow portion (50) is provided whose diameter gradually becomes narrower from the starting point of the conical portion (44) to the end, so that when the protrusion (46) is inserted into the seat channel (24), it can be spaced apart from the inner diameter surface of the seat channel (24) by a set distance, thereby enabling fluid movement.

Referring to FIGS. 3 and 4, the narrowed portion (50) may include a gently narrowed portion (52) provided around the protrusion (46) and having a diameter that gradually narrows from the starting point of the conical portion (44) to the partition (47) formed at the center of the protrusion (46), and an abruptly narrowed portion (54) having a diameter that gradually narrows from the starting point of the partition (44) to the end point of the protrusion (46).

In this way, the gap between the outer surface of the gently narrowing portion (52) and the sharply narrowing portion (54) and the inner surface of the sheet path (24) is formed to gradually widen from the top to the bottom.

The section (47) indicates the boundary between the gently narrowing section (52) and the sharply narrowing section (54).

Meanwhile, referring to FIG. 5, the abrupt narrowing portion (54) gradually narrows more abruptly than the gentle narrowing portion (52) based on the partition (47) formed at the center of the protrusion (46), so that when the fluid introduced through the flow path inlet (12) rises through the sheet flow path (24), it can be introduced into the fluid flow path (16) with the flow velocity increasing from the lower portion to the upper portion.

Next, the fluid flowing into the fluid path (16) can rise through the circumference of the cone (44) and the multiple fluid cross-sections (43) of the sliding guide (42) and be discharged through the fluid outlet (14).

Accordingly, as the gap between the protrusion (46) and the seat path (24) narrows from the bottom to the top, the stem (2) is moved up and down through the driving unit (2) to adjust the height of the protrusion (46), so the flow rate of the fluid can be easily controlled.

Meanwhile, when the fluid moves upward through the sheet path (24), the flow rate increases rapidly as it rapidly narrows in the rapid narrowing section (54), and then gradually increases in the gentle narrowing section (52) after passing through the partition section (47), thereby doubly controlling the flow rate, thereby preventing the fluid from flowing due to the generation of eddies when the fluid flows into the fluid pipe (16).

Referring to Fig. 11, even in the case where the protrusion (46) is in the shape of a triangular vertex, the fluid rising through the sheet path (24) moves through the conical portion (44) and the flow cross-section portion (43) of the sliding guide (42) and is discharged to the fluid outlet (14), just like in the case of Fig. 5 described above.

When the stem head (40) moves up and down between the seat (20) and the fluid outlet (14), the protrusion (46) can be configured to be inserted into the seat path (24) and move up and down.

The protrusion (46) may be provided with an auxiliary conical portion (48) formed in a conical shape at the starting point of the sharp narrowing portion (54). The auxiliary conical portion (48) may play a guiding role when the protrusion (46) enters the sheet path (24).

Referring to FIG. 4 and FIG. 10, the diameter (a) of the sliding guide (42) can be configured to be the same as the diameter (b) of the starting point of the conical portion (44). This can allow the fluid moving upward through the circumference of the conical portion (44) to move upward through the flow cross-section (43) with the lowest possible resistance without being caught on the bottom surface of the sliding guide (42).

That is, the cross-section of the fluid section (43) can be formed so that the lower portion is convex downward and the upper portion is convex upward. Accordingly, when the fluid moves from the lower portion to the upper portion through the fluid section (43), it can be smoothly guided upward through the side surface of the fluid section (43) from the conical portion (44) while reducing resistance.

The width (W1) of the starting point of the gently narrowing section (52) is formed to be larger than the width (W2) of the partition section (47).

The width (W2) of the section (47) is formed to be larger than the width (W3) of the end point of the sharply narrowed section (54).

The width (W4) of the sheet path (24) may be formed to be larger than at least one of the width (W1) of the starting point of the gently narrowed portion (52), the width (W2) of the partition portion (47), and the width (W3) of the ending point of the sharply narrowed portion (54), so that the protrusion (46) may be inserted into the sheet path (24) to enable movement of fluid when moving up and down.

An inner curvature portion (45) that is formed to be bent inward at the connection portion between the cone portion (44) and the protrusion portion (46) can be formed to prevent the protrusion portion (46) from being cut off from the cone portion (44) or cracks from occurring due to resistance when the fluid moves.

The inner curvature portion (45) can be formed to be curved by connecting each cutting surface while forming the cutting surface in contact with the conical portion (44) to have a larger diameter than the cutting surface in contact with the protrusion portion (46).

Therefore, the flow control valve according to one embodiment of the present invention can control the flow rate constantly from a micro flow rate to a large flow rate. In addition, the present invention can prevent the stem from bending due to the flow of fluid and minimize the flow loss on the inlet side.

In addition, the present invention can be configured to form a plurality of flow sections in the sliding guide of the stem head so that a greater amount of fluid can pass through the seat channel than the amount of fluid passing through the seat channel. In addition, the present invention can form a protrusion at the end of the stem head cone and insert a portion of it into the seat channel so that the amount of fluid discharged from the seat channel can be controlled according to the up-and-down movement of the stem head.

Although the present invention has been described with reference to the embodiments shown in the drawings, these are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

Therefore, the true technical protection scope of the present invention should be defined by the following patent claims.

2: Drive unit 10: Valve body
12: Fluid inlet 14: Fluid outlet
16: Fluid pipe 20: Sheet
22: Sheet surface 24: Sheet euro
30: Stem 40: Stem Head
42: Sliding guide 43: Floating section
44: Conical part 45: Inner curvature part
46: Protrusion 47: Compartment
48: Auxiliary cone 50: Narrow section
52: Gentle narrow section 54: Sharp narrow section

Claims (3)

A valve body having a fluid inlet, a fluid outlet, and a fluid line;
A seat installed in the above fluid line and having a seat surface and a seat path;
A stem that is inserted and installed in the valve body so as to be able to move up and down; and
A valve comprising a stem head provided at the tip of the stem and capable of contacting the seat surface of the seat by the up-and-down movement of the stem,
The above stem head is composed of a sliding guide having a diameter corresponding to the diameter of the fluid line so as to have a gap to enable vertical movement in the fluid line, and a conical portion formed at the end of the sliding guide to open and close the seat surface when moving up and down.
The above sliding guide forms a plurality of fluid cross-sections for passing a fluid having a cross-sectional area (D1) wider than the cross-sectional area (D2) of the seat tube, thereby reducing fluid loss due to the stem head even at a small opening and preventing bending of the stem due to high differential pressure.
The above conical portion is provided with a protrusion that is inserted into the seat path and controls the flow rate of the fluid according to the amount of up and down movement of the stem.
The above protrusion is formed in at least one of a triangular vertex shape formed at an end of the cone, or a protrusion shape formed extending from an end of the cone;
The spacing (S2) of the above fluid section has a range of 3 to 4 times the spacing (S1) of the curvature section of the above sliding guide (42).
The plurality of curved sections of the above sliding guide are arranged at narrow intervals (S1) on the inner diameter of the fluid conduit and are firmly supported on the inner side of the fluid conduit so as to move the fluid through the fluid cross-section portion which has a wider cross-sectional area (D1) than the cross-sectional area (D2) of the sheet path and is arranged at wide intervals (S2) while moving up and down.
A flow control valve characterized in that the diameter (a) of the sliding guide is configured to be the same as the diameter (b) of the starting point of the conical portion, so that the fluid moving upward through the circumference of the conical portion moves upward through the flow cross-section portion with reduced resistance without being caught on the bottom surface of the sliding guide.
In paragraph 1,
A flow control valve characterized in that the contact portion of the above sheet surface is formed in a round shape and is in sealing contact with the end face of the above cone portion.
In paragraph 1 or 2,
A flow control valve characterized in that, in the case where the above protrusion is in the form of a projection, a narrow portion is provided whose diameter gradually narrows from the starting point of the cone to the end, so that when the protrusion is inserted into the seat channel, it is spaced apart from the inner diameter surface of the seat channel by a set distance, thereby enabling fluid movement.

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