KR20200000915U - Velocity control disk trim with non-dead stage for control valve - Google Patents

Abstract

The present invention is a valve-trimmed structure of a control valve having a flow path communicating with a hollow portion communicating with an outer circumferential portion and a second space (R2) contacting a first space (R1) of a valve, and a flow path communicating with a hollow portion, a plate having a disc shape A plurality of first long grooves 15 having a circumferential width W1 larger than the radial length L1 in the body P form a straight or curved arrangement, and are arranged in a shape that gradually approaches the center from the outer side. 1 A plurality of second long grooves 25 having a radial length L2 larger than the circumferential width W2 in the flow path forming parts 10, A, and horizontal plate body P, are straight or A first disk (Disk, 100) having a second flow path forming portion (20, B type, vertical type), which is arranged in a shape that gradually becomes closer to the center from the outer side in a curved shape arrangement; And the first flow path formation Sphere in the same shape as the second flow path forming part 20 at a position corresponding to the part 10 The third flow path forming portion (30, B-type, vertical) and the fourth flow path forming the same shape as the first flow path forming portion 10 at a position corresponding to the second flow path forming portion 20 Second disk (Disk, 200) having a portion (40, A, horizontal); It relates to a valve trim structure of a multi-stage flow rate control type control valve without a private open continuous flow path, characterized in that comprises a.

Description

The valve trim structure of the multi-stage flow rate control type control valve without a historic open flow passage {Velocity control disk trim with non-dead stage for control valve}

 The present invention relates to a multi-velocity control disk trim with non-dead stage & cyclone open flow path, Multi cyclone flow path trim with non-dead stage.

In the case of a control valve used for flow control under a provided temperature and pressure environment, such as a conventional refinery, petrochemical, power plant, etc., the pressure drop phenomenon due to a rapid increase in the flow rate in the valve as the fluid flowing from the fluid inlet passes through the valve to the outlet This will happen. Due to this, the pressure falls below the vapor pressure at the temperature, and the fluid in the liquid state vaporizes to generate bubbles.

When air bubbles are generated, the volume per unit mass of the fluid is rapidly increased, and the flow of the fluid may be stopped due to a plurality of air bubbles. In addition, there is a problem that the burst energy generated during the collision of the air bubbles and the air bubbles the valve components and the inner wall, thereby eroding and damaging the valve components and the inner walls. In addition, noise is generated by bursting or striking bubbles.

In particular, this phenomenon occurs severely when the valve starts to open or when the degree of opening is small. This phenomenon is also compared to the phenomenon of passing through a vena contraction or orifice.

<Former structure of valve trim for flow control>

 1) Figure 1, Flow Control Trim with 1-step perforated opening: This is a basic flow control trim, and the flow control capability is poor.

2) Fig. 2, Flow Control Trim with Multi-step Perforated Opening: It is an advanced flow control trim that is more advanced than the single-stage perforated type. Continuity is limited.

 3) Figure 3. Multi-stage disc zigzag flow control trim with flow path and opening

It is an advanced flow control trim that is more advanced than the single-stage and multi-stage porous type, and has improved flow control ability. However, it is a blocked passage (black arrow part) that occurs at the bottom of the opening of the disc. There is a problem

     <Picture 3>

<Comparison item 1, number of turns>

<Figure 4> Previous technology: When two-dimensional (X, Y-axis) zigzag processing on one disc (DISK), the flow path and the bends are radially formed toward the center of the disc, so the number of bends is relatively small.

<Comparison item 2, historical site (死 積: dead area) occurrence>

            <Figure 5> Previous technology: In the case of two-dimensional (X, Y-axis) zigzag processing on one disc (DISK)

     In the case of X, Y two-dimensional zigzag processing on one disk, the thickness of the lower part must be left to prevent the disk from bursting. In valve operation, the section becomes a private (적: dead area) and the fluid Passing becomes impossible.

<Comparative item 3, number of bends and occurrence of historical sites (死 積: dead area)>

     <Figure 6> Previous technology: In the case of zigzag processing with 2 open discs + 1 clogged disc

As a prior art, Patent No. 10-1238501 (designation name: noise reduction device for control valves) relates to a noise reduction device for control valves, wherein a hollow portion in which a plug is elevated is vertically formed, and the hollow portion and an outer peripheral portion In the noise reduction device for a control valve having a flow path for communicating and having a first protection cap at the top and a second protection cap at the bottom, a plug through groove is formed in the center, and the first groove and the first block are alternately opened. (I) A first disk formed with a first flow path forming portion disposed radially and a plug passing groove in the center) is formed, and is in contact with the lower surface of the first disk 10, the second groove and the second A second disk having a second flow path forming portion disposed radially alternately in a blocking zone and radially forming a plug passage groove in the center, and being located above the first disc, located above the first flow path, the upper side of the first flow path forming portion To AJU is composed of a blocking plate and a blocking plate positioned below the second original plate and blocking a lower side of the second flow path forming part.The first original plate and the second protective cap are located between the first protective cap and the second protective cap. Providing a noise reduction device for a control valve, characterized in that the original plate and the blocking plate are formed in a plurality of layers in order, and the first flow path forming portion and the second flow path forming portion overlap to form a flow path communicating the hollow portion and the outer peripheral portion. do.

In the control valve, depending on whether or not the speed of the fluid flow of the valve interior trim (the main internal velocity such as trim: valve plug, cage, seat ring, etc.) is adjusted, flashing, cavitation, water hammer, etc. may occur in the liquid condition. In the case of gas, noise and vibration may occur.

Particularly, in a liquid condition, when the pressure on the secondary side passing through the valve trim falls below the vapor pressure (Vp: Vapor pressure) of the fluid, the fluid that was the liquid is flashed and the volume expands to prevent fluid flow. In severe cases, the secondary side flow rate is not generated, or the flashed bubbles return to the secondary pressure again and become isolated, expanded, and burst, causing cavitation that damages the valve inner wall and the pipe inner wall according to the impact. The phenomenon also occurs.

In particular, high (differential) pressure control valves used in power plants, oil refineries, and chemical plants usually have a primary pressure of 100 to 300 Kgf / cm2g, and a differential pressure (DP) of 0 to 300 Kgf / cm2. , In this case, depending on the flow rate control capability of the trim of the control valve, it plays an important role that determines the operational safety (positiveness) of the plant.

Depending on the flow rate control ability of the high (differential) pressure control valve, that is, how to decelerate the flow rate in the high differential pressure state, the fluid passing through the valve trim can maintain a stable flow without dropping below the vapor pressure (Vp) instantaneously. In other words, the performance of the control valve and the operational stability of the plant can be considered.

In the valve trim structure of the control valve having a flow path connecting the outer circumferential portion and the hollow portion communicating with the second space (R2) and the outer circumferential portion contacting the first space (R1) of the valve,

A plurality of first long grooves 15 having a circumferential width W1 larger than a radial length L1 in a plate-shaped plate body P form a straight or curved shape, and gradually become closer to the center from the outer side. A first flow path forming part (10, A type, horizontal type) and

A shape in which a plurality of second long grooves 25 having a radial length L2 larger than a circumferential width W2 in a disk-shaped plate body P form a straight or curved shape and gradually get closer to the center from the outer side The second flow path forming portion (20, B-type, vertical type),

A first disk (Disk, 100) having a;

A third flow path forming part (30, B type, vertical type) provided in the same shape as the second flow path forming part 20 at a position corresponding to the first flow path forming part 10,

A fourth flow path forming part (40, A type, horizontal type) provided in the same shape as the first flow path forming part 10 at a position corresponding to the second flow path forming part 20,

A second disk (Disk, 200) having a;

A valve trim structure of a multi-stage flow rate-controlled control valve, comprising a continuous open flow passage without historic features, comprising:

The present invention is to control the flow rate of the high (differential) pressure control valve, that is, how to decelerate the flow rate in the high differential pressure state, so that the fluid passing through the valve trim cannot instantly drop below the vapor pressure (Vp) and maintain a stable flow. In order to provide a valve trim structure for a multi-stage flow rate control type control valve with a continuous open oil that does not have excellent performance, control valve performance and plant operation stability.

1 (a, b) is a valve trim structure and a control valve according to an embodiment of the present invention.
Figure 2 (a, b) is a disk configuration of the valve trim structure of the multi-stage flow rate control type control valve without continuous historical flow path according to an embodiment of the present invention.
3 is a detailed view of the configuration of the original plate 2a.
4 is an explanatory view of a state in which a disk of a valve trim structure according to an embodiment of the present invention overlaps to form a flow path.
5 is an explanatory view of a flow path formed by overlapping a disk of a valve trim structure according to an embodiment of the present invention.
6 is an overall configuration of a valve trim structure of a multi-stage flow rate control type control valve without a private open continuous flow path according to an embodiment of the present invention.

Hereinafter, a valve trim structure of a multi-stage flow rate control type control valve without a historic site according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 (a, b) is a valve trim structure and a control valve according to an embodiment of the present invention, and FIG. 2 (a, b) is a continuous open flow path without multi-stage flow rate control valve according to an embodiment of the present invention Fig. 3 is an explanatory diagram of the configuration of the valve trim structure, Fig. 3 is a detailed view of the configuration of the disc 2a, and Fig. 4 is an explanatory view of a state in which the disk of the valve trim structure is overlapped to form a flow path. It is an explanatory view of a flow path formed by overlapping the original plate of the valve trim structure according to an embodiment, and FIG. 6 is an overall configuration diagram of the valve trim structure of the multi-stage flow rate control type control valve without a historic open passage according to an embodiment of the present invention.

1 to 6, the valve trim structure and the control valve according to an embodiment of the present invention are provided with a hollow part communicating with a first space R1 of the valve and a second space R2 It relates to a valve trim structure of a control valve having a flow path communicating the outer circumference with the hollow.

1 to 6, the valve trim structure and the control valve according to an embodiment of the present invention include a first disk (Disk, 100) and a second disk (Disk, 200).

2 to 4, the first disk (Disk, 100) has a plurality of first long grooves having a circumferential width (W1) greater than the radial length (L1) in the disk-shaped plate body (P) (15) The first flow path forming portion (10, A type, horizontal type) arranged in a shape that gradually forms closer to the center from the outer side and forms a straight or curved shape, and the radial length of the plate-shaped plate body (P) A plurality of second long grooves (L2) is greater than the circumferential width (W2) of the second flow path forming portion (20, B) arranged in a shape that gradually forms closer to the center from the outer side and forms a straight or curved arrangement Type, vertical type).

2 to 4, the second disk (Disk, 200) is provided in the same shape as the second flow path forming portion 20 at a position corresponding to the first flow path forming portion 10 A flow path forming portion (30, B-shaped, vertical), and a second flow path forming portion (40) provided in the same shape as the first flow path forming portion (10) at a position corresponding to the second flow path forming portion (20), A type, horizontal type).

2 to 6, in the valve trim structure and the control valve according to an embodiment of the present invention, the first flow path forming portion (10, A type, horizontal type) and the second flow path forming portion (20, The first disk (Disk, 100) having a B-shaped, vertical type, the third disk (30, B-type) and the second disk (40, A-type) having a fourth flow-path forming portion (Type 40, A) 200) are alternately stacked.

Here, the upper and lower protective caps 310 and the upper protective caps 320 are provided on the upper and lower portions of the stack of the first disks 100 and the second disks 200, respectively, and the first flow path forming part ( 10, A type, horizontal type) and the third flow path forming parts 30, B type, vertical type, forming a continuous open flow path without historical features. The second flow path forming portion (20, B type, vertical type) and the fourth flow path forming portion (40, A type, horizontal type) form a continuous opening-type flow path without history.

2, 3, and 4, in the valve trim structure and the control valve according to an embodiment of the present invention, the first flow path is formed by an arrangement formed by a plurality of first long grooves 15 The second flow path forming part 20 formed by the arrangement formed by the part 10 and the plurality of second long grooves 25 is formed in a spiral pattern having a shape facing from the outer circumferential surface to the center. It forms a longer play with a disc and has an advantageous effect in terms of the size of the groove and the combination of the upper and lower disc grooves.

2, 3, and 4, in the valve trim structure and the control valve according to an embodiment of the present invention, the first long groove 15 forming the first flow path forming part 10 is one 5 to 30 pieces are formed in the arrangement, and 5 to 30 pieces of the second long grooves 25 forming the second flow path forming part 20 are formed in one arrangement. The disk having the same size is formed in the same number as the first flow path forming portion 10 and the second flow path forming portion 20 in one disc and is formed in the shape of 2 to 10 wings facing outward from the center. It is preferred in terms of forming a long play, forming the required size of the groove, and combining between the upper and lower disc grooves.

Hereinafter, the valve trim structure and the control valve according to an embodiment of the present invention will be described in detail.

2 (a, b), when forming a flow path, as shown in FIG. 3, has an advantageous effect of easily increasing or decreasing the number of flow path bends.

<Figure 2a> is the first disc (DISK, 10).

① The first disc is formed of two “type” flow paths in which the horizontal direction is longer than the vertical direction, and two “B shape” flow paths in which the vertical direction is longer than the horizontal direction.

② Among the flow paths of the 'A shape', the size in the horizontal direction is the same as the size of the A width = 2B + middle spacing on the same circumferential line, and the size in the vertical direction is 1/3 of the height dimension of the 'B shape' flow path. .

③ Among the flow paths of ‘B shape’, the size in the horizontal direction is the same as the B width = A width-(B + middle interval) on the same circumferential line, and the size in the vertical direction is three times the 'A length'.

④ Basically, the size of the 'A' and 'B' flow paths is a value calculated by interlocking with the entire lift (stroke) of the control valve, depending on the flow rate that the individual discs must handle (pass through).

⑤ Arrange the flow paths of 'A' and 'B' in the direction of a whirlwind according to the number of bends calculated to slow the flow rate.

   <Figure 2b> Figure 2b is a disk (DISK).

① The original plate No. 2 is formed of two flow paths having a longer transverse direction than the vertical direction, and two flow paths of a 'B shape' longer than the horizontal direction.

     ② Among the flow paths of the 'A shape', the horizontal size (circumferential size) is the same as the A width = 2B + the size of the middle gap on the same circumference line, and the vertical size (radial size) is the 'B shape' flow path. It is 1/3 of the height dimension.

     ③ Among the flow paths of ‘B-shaped’, the size in the horizontal direction is the same as B horizontal = A horizontal − (B + middle interval) on the same circumferential line, and the vertical size is three times the 'A vertical'.

     ④ Basically, the size of the 'A' and 'B' flow paths is a value calculated by interlocking with the entire lift (stroke) of the control valve, depending on the flow rate that the individual discs must handle (pass through).

     ⑤ Arrange the flow paths of 'A' and 'B' in the direction of a whirlwind shape according to the number of bends calculated to slow the flow rate.

     ⑥ In this structure, the digits 'A' and 'B' of the first disc are changed and arranged at the same position.

<Drawing 4 & 5>

① As shown in Fig. 4, the first disk and the second disk are stacked and stacked.

② When two discs are stacked, as shown in Fig. 5, the open flow paths appear continuously in the X, Y, and Z directions (3D, because the thickness of one disc, for example, 0.1 to cm). When switching from the X-direction to the Y-direction and from the Y-direction to the Z-direction, each of the curves (Turn) occurs, through which it is possible to obtain a flow velocity deceleration effect according to the energy reduction of the fluid. ③ The two discs with the above open structure will have a total of 32 curved structures. ④ Depending on how the whirlwind and spiral flow paths are constructed, the number of curves can be formed more or less. Can be.

6 is a structure of a control valve equipped with a continuous open type multi-stage flow rate control valve trim without dead spots (死 積: dead area). It shows a built-in control valve trim structure in which two discs (one set) each having a trim of an A and B rectangular flow path open structure are stacked successively.

<For the second embodiment>

① As shown in Fig. 7 (a, b), a rectangular open flow path of different shapes A and B is processed on the first disc DISK, and A and the disc A of different shapes are processed on the second disc DISK. By processing the B-shaped rectangular open flow path, the first and second circular plates are repeatedly stacked.

② In the case of Figure 7 (a, b), the total Cv = 8, the number of turns (Turn) = 32 is a laminated disk structure (Valve Cage) having a linear flow characteristics. ③ At this time, as shown in the figure, each disc has an open flow path, and continuously open flow paths are formed without dead spots (면적: dead areas), which can solve the problem of intermittent flow path control. You can confirm that there is.

  <For the third embodiment>

① As shown in Fig. 8, A and B-shaped rectangular open flow paths of different shapes are processed in the first disk DISK, and A and B-shaped rectangular openings of different shapes are opened in the second disk DISK. After processing the flow path, the plates 1 and 2 are repeatedly stacked.

② In the case of Figure 8, the total Cv = 16, the number of turns (Turn) = 32 is a laminated disk structure (Valve Cage) having a linear flow characteristics.

③ At this time, as shown in the figure, each disc has an open flow path, and continuously open flow paths are formed without dead spots (면적: dead areas), which can solve the problem of intermittent flow path control. You can confirm that there is.

④ FIG. 8 is a structure capable of extinguishing twice the flow rate under the same external dimension condition when the differential pressure is relatively smaller than the structure of FIG. 7 and a large flow rate (Valve Cv) is required.

<For the fourth embodiment>

② FIG. 9 is a structure in which 50% of the disk structure (Cv = 8) of FIG. 7 and 50% of the disk structure (Cv = 16) of FIG. 8 are stacked. ② In the case of Fig. 8, the lower 50% is Cv = 4, the upper 50% is Cv = 8, the total Cv = 12, the number of turns = 32. to be.

③ At this time, as shown in the figure, each disc has an open flow path, and continuously open flow paths are formed without dead spots (면적: dead areas), which can solve the problem of intermittent flow path control. You can confirm that there is.

④ Fig. 9 is a structure that can be applied when the control valve is initially operated, when the differential pressure is maximized at a low opening degree, when the flow rate is small, and when the operation flow rate characteristic is not linear, but requires EQ-%.

<Secure flow rate coefficient>

To realize the rated flow coefficient of the control valve (Rated Cv), obtain the total area (opening area through which the fluid passes) corresponding to the specific required flow rate coefficient, and then calculate the opening area of each disc and divide it by the total area. The total number of disks to be stacked is shown. See Figure 10

<Implementing flow characteristics of control valves>

In order to realize the flow characteristics of the control valve, the flow characteristics of each linear, EQ%, Modified%, etc. can be achieved by adjusting the opening area of each disc according to the Cv diagram according to the desired valve opening. have. See Figure 11

The present invention has been described in connection with the preferred embodiment mentioned above, but the scope of the invention is not limited to these examples, and the scope of the invention is defined by the following claims, and the scope of the invention and the equivalent It will include various modifications and variations belonging to.

The reference numerals described in the claims below are merely intended to assist in the understanding of the design and do not affect the interpretation of the scope of rights, and the scope of rights should not be interpreted narrowly by the reference numerals described.

10: first flow path forming portion (type A)
10: first flow path forming portion (type A)
15: Chapter 1 Home
20: second flow path forming portion (type B)
25: Chapter 2 groove 30: 3rd flow path forming part (B type)
40: fourth flow path forming portion (type A) 100: first disk (Disk)
200: second disk (Disk) 310: lower protective cap
320: upper protective cap
L1, L2 radial length
W1, W2: circumferential width

Claims (4)

In the valve trim structure of the control valve having a flow path connecting the outer circumferential portion and the hollow portion communicating with the second space (R2) and the outer circumferential portion contacting the first space (R1) of the valve,
A plurality of first long grooves 15 having a circumferential width W1 larger than a radial length L1 in a plate-shaped plate body P form a straight or curved shape, and gradually become closer to the center from the outer side. A first flow path forming part (10, A type, horizontal type) and
A shape in which a plurality of second long grooves 25 having a radial length L2 larger than a circumferential width W2 in a disk-shaped plate body P form a straight or curved shape and gradually get closer to the center from the outer side The second flow path forming portion (20, B-type, vertical type),
A first disk (Disk, 100) having a;

A third flow path forming part (30, B type, vertical type) provided in the same shape as the second flow path forming part 20 at a position corresponding to the first flow path forming part 10,
A fourth flow path forming part (40, A type, horizontal type) provided in the same shape as the first flow path forming part 10 at a position corresponding to the second flow path forming part 20,
A second disk (Disk, 200) having a;
A valve trim structure of a multi-stage flow rate-controlled control valve, comprising a continuous open flow passage without historic features, comprising:
According to claim 1,
The first disk (Disk, 100) having a first flow path forming portion (10, A type, horizontal type) and a second flow path forming portion (20, B type, vertical type), and the third flow path forming portion (30, B) Type) and a second disk (Disk, 200) having a fourth flow path forming portion (40, A type) are alternately stacked,

The upper and lower protective caps 310 and the upper protective caps 320 are provided on the upper and lower portions of the stacked body of the first and second disks (Disk, 100) and the second disk (Disk, 200), respectively.

The first flow path forming portion (10, A type, horizontal type) and the third flow path forming portion (30, B type, vertical type) form a continuous open flow path without history,

The second flow path forming portion (20, B-type, vertical type) and the fourth flow path forming portion (40, A-type, horizontal type) form a continuous open flow path without a feature, characterized in that forming a continuous open flow path without historical features. The valve trim structure of the multi-stage flow rate control valve.
According to claim 1,
The first flow path forming portion 10 formed by the arrangement formed by the plurality of first long grooves 15 and the second flow path forming portion 20 formed by the arrangement formed by the plurality of second long grooves 25 are formed on the outer circumferential surface. A valve trim structure of a multi-stage flow rate control valve that has a continuous open flow path without a feature, characterized in that it is a spiral pattern of a shape facing the center.
According to claim 3,
5 to 30 first long grooves 15 forming the first flow path forming part 10 are formed in one arrangement,
The second long grooves 25 forming the second flow path forming part 20 are 5 to 30 in one arrangement,

The first flow path forming portion 10 and the second flow path forming portion 20 in one disc are formed in the same number and are formed in the shape of 2 to 10 wings facing outward from the center. The valve trim structure of a multi-stage flow control valve with an open flow path.

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