JP2009024856A - Composite valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite valve capable of smoothly making fluid of powder and grain flow in a valve casing sleeve, when opening a cut valve valve element for opening-closing an upper end opening part of the valve casing sleeve. <P>SOLUTION: The valve casing sleeve 5 is arranged in a valve casing 4 having a valve casing inflow port 10 and a valve casing outflow port 11. The upper end opening part 13 of the valve casing sleeve 5 is communicated with the valve casing inflow port 10, and a lower end opening part 14 is opened in the valve casing 4, and is opposed to the valve casing outflow port 11. A freely rotatable bowl-shaped cut valve valve element 6 for opening-closing the upper end opening part 13 and a retreat space 21, are arranged in the valve casing sleeve 5. The retreat space 21 is positioned on the downstream side of the upper end opening part 13 of the valve casing sleeve 5, and expands outward in the radial direction more than the upper end opening part 13. A seal valve valve element 7 for opening-closing the lower end opening part 14 of the valve casing sleeve 5 is arranged in the valve casing 4. The cut valve valve element 6 retreats to the retreat space 21 in the valve casing sleeve 5 in an opening position O. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a composite valve in which two valves are accommodated between the surfaces of one valve, and for example, relates to a valve provided in a pipeline system or the like for transferring a granular material by a carrier gas.

  Conventionally, as this type of composite valve, for example, as shown in FIG. 8, there is a composite valve 83 provided in a pipeline system 82 for transferring coal powder to the gasifier 81 by nitrogen gas. On the upstream side (inlet side) of the composite valve 83, a hopper 84 that stores and supplies coal powder is provided. An air separation device 85 that separates air into nitrogen and oxygen is provided on the downstream side (outlet side) of the composite valve 83.

  As shown in FIGS. 9 to 11, the composite valve 83 is a valve in which a cut valve 86 and a seal valve 87 are accommodated between one valve face, and a valve box 88 and a cylindrical shape provided in the valve box 88. Valve box sleeve 89. The valve box 88 has a valve box inlet 90 at the top and a valve box outlet 91 at the bottom. The upper end of the valve box sleeve 89 is joined to the valve box 88, and the upper end opening 92 of the valve box sleeve 89 communicates with the valve box inlet 90. The lower end opening 93 of the valve box sleeve 89 opens in the valve box 88 and faces the upper side of the valve box outlet 91. As a result, a flow path 94 is formed from the valve box inlet 90 through the valve box sleeve 89 to the valve box outlet 91.

  In the valve box sleeve 89, a rotatable disc-shaped cut valve valve body 96 that opens and closes the flow path 94 in the valve box sleeve 89 is provided. One side in the diameter direction of the cut valve valve body 96 is fixedly supported by a cut valve valve rod 97 orthogonal to the fluid flow direction in the valve box sleeve 89, and the other side is supported by a trunnion 98. The cut valve valve stem 97 is inserted into a first boss portion 99 provided on one side surface of the valve box 88 and is rotatably held via a cylindrical trunnion 100. An annular cut valve valve seat 101 corresponding to the cut valve valve body 96 is provided on the inner week surface of the valve box sleeve 89. The base end side of the cut valve valve rod 97 is connected to an operating device 102 for opening and closing the cut valve.

  In the valve box 88, a rotatable seal valve body 105 for opening and closing the lower end opening 93 of the valve box sleeve 89 is provided. The seal valve body 105 is formed in a bowl shape that bulges outward with respect to the rotation axis 106. One end portion of the seal valve body 105 is fixedly supported by a seal valve valve rod 107 orthogonal to the fluid flow direction in the valve box sleeve 89, and the other end portion is rotatably fitted to the outer peripheral portion of the trunnion 100. Are held together. As a result, the seal valve body 105 is supported by the valve box 88 via the seal valve valve rod 107 so as to be rotatable in a direction crossing the flow of fluid in the valve box sleeve 89. The seal valve valve rod 107 is inserted into a second boss portion 109 provided on the other side surface of the valve box 88 and is rotatably held.

  The seal valve body 105 has a spherical seat surface 110 on the inner side. A seal valve valve seat 111 made of an elastic material that elastically slides on the seat surface 110 of the seal valve body 105 is provided at the lower end of the valve box sleeve 89. The base end side of the seal valve valve rod 107 is connected to an operating device 108 for opening and closing the seal valve.

  A valve box inlet 90 of the composite valve 83 is connected to the bottom of the hopper 84 via a connecting pipe 115. The valve box outlet 91 is connected to the gasification furnace 81 via a supply pipe 116, and a nitrogen supply pipe 117 for supplying nitrogen from the air separation device 85 is connected to the upstream end of the supply pipe 116. Yes. A pressure equalizing pipe 118 communicating with the connection pipe 115 and the supply pipe 116 is connected, and the pressure equalizing pipe 118 is provided with a pressure equalizing valve 119.

  According to this, as shown in FIG. 10 (a), when the coal granular material is transferred to the gasification furnace 81 from a state in which the cut valve valve body 96 and the seal valve valve body 105 are closed, first, a pressure equalizing valve is used. 119 is opened to equalize the pressure on the downstream side and the upstream side of the composite valve 83. Next, as shown in FIG. 10B, the operating device 108 is operated to open the seal valve body 105, and then As shown in FIG. 11, the operating device 102 is operated to open the cut valve valve body 96.

  Thereby, the coal granular material in the hopper 84 passes through the flow path 94 in the valve box sleeve 89 from the valve box inlet 90 of the composite valve 83 and flows into the supply pipe 116 from the valve box outlet 91. The nitrogen generated from the air separation device 85 is transferred from the supply pipe 116 to the gasifier 81.

The composite valve 83 including the cut valve valve body 96 and the seal valve valve body 105 as described above is described in Patent Document 1 below.
JP-A-11-108225

  However, in the above-described conventional type, the cut valve valve body 96 has a disc shape, and the cut valve valve body 96 and the cut valve valve rod 97 are configured as a butterfly valve type. For this reason, as shown in FIG. When the valve body 96 is fully opened, the cut valve body 96 remains in the central portion in the radial direction of the flow path 94 in the valve box sleeve 89, so that the flow of coal powder (an example of a fluid) There is a problem that the coal particles are largely obstructed by the body 96 and the coal powder particles do not flow smoothly. In particular, when the diameter of the composite valve 83 is small, the ratio of the fully opened cut valve body 96 in the valve box sleeve 89 is large, so that the problem that the flow of coal powder is obstructed becomes significant. .

  An object of the present invention is to provide a composite valve that allows fluid to flow smoothly in a valve box sleeve when a first valve body that opens and closes one end opening of the valve box sleeve is open.

In order to achieve the above object, the composite valve according to the first aspect of the present invention is provided with a tubular valve box sleeve in a valve box having a valve box inlet and a valve box outlet,
One end opening of the valve box sleeve communicates with the valve box inlet, the other end opening of the valve box sleeve opens in the valve box and faces the valve box outlet,
In the valve box sleeve, a rotatable first valve body that opens and closes one end opening of the valve box sleeve and a retreat space are provided,
The evacuation space extends radially outward from one end opening of the valve sleeve,
A rotatable second valve body for opening and closing the other end opening of the valve box sleeve is provided in the valve box,
The second valve body is retracted between the inner periphery of the valve box and the outer periphery of the valve sleeve in the open position;
The first valve body is retracted to the retreat space in the valve box sleeve at the open position.

  According to this, by opening the first valve body and the second valve body, the fluid flows from the valve box inlet to the valve box outlet through the valve box sleeve. At this time, since the first valve body is retracted in the retreat space in the valve box sleeve, the flow of fluid is not significantly hindered by the first valve body, and the fluid flows smoothly in the valve box sleeve. .

In the composite valve according to the second aspect of the present invention, an inlet-side tapered surface is formed on the inner peripheral surface of the valve box from the valve box inlet to one end opening of the valve box sleeve,
The inlet side taper surface has a diameter that decreases from the valve box inlet side toward the one end opening of the valve box sleeve.

  According to this, when a hopper that stores fluid (powder particles, etc.) is directly connected to the valve box inlet of the composite valve, the fluid in the hopper is opened to the bottom opening of the hopper by opening the first valve body. And flows into the valve box inlet of the composite valve. At this time, since the tapered surface on the inlet side of the composite valve is continuous with the opening at the bottom of the hopper, the inflow of fluid into the valve box is promoted, and a cone having a diameter reduced downward is conventionally provided at the bottom of the hopper. The cross-sectional shape portion can be replaced (also used) with the inlet side tapered surface of the composite valve. Thereby, the height of the conical cross-sectional shape part of the bottom part opening part of a hopper can be reduced, and the height of the whole hopper can be reduced in size.

In the composite valve according to the third aspect of the invention, the first valve body has a spherical first seat surface on the outside,
The second valve body has a spherical second seat surface inside,
The valve box sleeve is provided with an annular first valve seat that is in sliding contact with the first seat surface, and a second valve seat that is in sliding contact with the second seat surface.

In the composite valve according to the fourth aspect of the invention, the first valve body has a valve body opening portion that communicates with one end opening portion of the valve box sleeve in the open position and retracts from the one end opening portion of the valve box sleeve in the closed position. ,
A pair of valve stems is provided for rotatably supporting the first valve body around an axial center in a direction transverse to the flow direction in the valve box sleeve;
The first valve seat is formed between the outer side of the first valve body and the inner peripheral surface of the valve sleeve, and extends all around the inlet side of the gap that continues from the one end opening side of the valve sleeve to the valve stem side. This prevents the fluid in the form of granular material from flowing into the gap.

  According to this, the first valve seat is formed between the outer side of the first valve body and the inner peripheral surface of the valve box sleeve, and is an inlet of a gap that continues from one end opening side of the valve box sleeve to the valve stem side. Block the side all around. As a result, it is possible to prevent a part of the granular fluid from flowing into the valve stem side through the gap, and the granular fluid bites into the rotating sliding portion of the valve stem. Can be prevented.

  As described above, according to the present invention, by opening the first valve body and the second valve body, fluid flows from the valve box inlet to the valve box outlet through the valve box sleeve. At this time, since the first valve body is retracted in the retreat space in the valve box sleeve, the flow of fluid is not significantly hindered by the first valve body, and the fluid flows smoothly in the valve box sleeve. .

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In addition, about the same member as a conventional one, the same code | symbol is attached and description is abbreviate | omitted.
Reference numeral 1 denotes a composite valve provided in a pipe line system 82 for transferring coal powder (an example of a fluid) to a gasification furnace 81 using nitrogen gas (an example of a gas). As shown in FIGS. 1 to 3, the composite valve 1 is a valve in which a cut valve 2 (an example of a first valve) and a seal valve 3 (an example of a second valve) are accommodated between the surfaces of one valve. A valve box 4, a valve box sleeve 5 provided in the valve box 4, a cut valve valve body 6 (an example of a first valve body), and a seal valve body 7 (of the second valve body). An example), a first operating device 8 for opening / closing the cut valve 2, and a second operating device 9 for opening / closing the seal valve 3.

  The valve box 4 has a valve box inlet 10 at the upper part and a valve box outlet 11 at the lower part. The valve box sleeve 5 has a cylindrical shape with both ends opened, and an upper end portion is attached to the valve box 4. An upper end opening 13 (an example of one end opening) of the valve box sleeve 5 communicates with the valve box inlet 10. Further, the lower end opening 14 (an example of the other end opening) of the valve box sleeve 5 opens in the valve box 4 and faces the valve box outlet 11, and the valve box inlet 10 passes through the valve box sleeve 5. A flow path 15 is formed through the valve box outlet 11.

  The valve box sleeve 5 has a projecting portion 16 projecting radially inward over the entire circumference on the inner peripheral surface of the upper end portion. Further, the upper end opening 13 has a tapered surface 17 whose diameter decreases toward the downstream side (lower side).

  A retreat space 21 is formed in the valve box sleeve 5. The retreat space 21 is located on the downstream side of the upper end opening 13, extends outward in the radial direction of the valve box sleeve 5 from the upper end opening 13, and is formed below the protrusion 16 over the entire circumference. .

  The cut valve body 6 of the cut valve 2 opens and closes the upper end opening 13 and is rotatably provided in the valve box sleeve 5. As shown in FIG. 4, the cut valve valve body 6 includes a bowl-shaped (hemispherical) valve body 6 a that swells radially outward with respect to the rotation axis 19, and a pair of valves provided on the valve body 6 a. Boss portions 6b and 6c. A circular valve body opening 6d is formed in the valve body 6a. As shown in FIG. 2, in the fully open position O, the cut valve valve body 6 is retracted to the retreat space 21, and the valve body opening 6 d overlaps the upper end opening 13 and communicates therewith. Further, as shown in FIG. 3, in the fully closed position S, the valve body opening 6 d is retracted from the upper end opening 13 to the retracting space 21.

  Further, the cut valve body 6 has a spherical first seat surface 6e on the outside. An annular cut valve valve seat 24 (an example of a first valve seat) that is in sliding contact with the first seat surface 6e is provided below the protrusion 16 of the valve box sleeve 5.

  The seal valve body 7 of the seal valve 3 opens and closes the lower end opening 14 and is rotatably provided in the valve box 4. The seal valve body 7 has a bowl-shaped valve body 7a that swells radially outward with respect to the rotation axis 19, and a pair of arms 7b and 7c provided on the valve body 7a. Yes. As indicated by a virtual line in FIG. 2, the seal valve body 7 is retracted between the inner peripheral surface of the valve box 4 and the outer peripheral surface of the valve box sleeve 5 in the fully open position O.

  The seal valve body 7 has a spherical second seat surface 7d on the inside. An annular seal valve seat 25 (an example of a second valve seat) is provided at the lower end (the other end) of the valve box sleeve 5 so as to be in sliding contact with the second seat surface 7d.

  The rotation axis 19 is formed in a direction crossing the fluid flow direction in the valve box sleeve 5. The cut valve body 6 is rotatably supported around the rotation axis 19 by a cut valve valve rod 27 disposed in the lateral direction. The cut valve valve rod 27 is divided into a pair of valve rods 27a and 27b. Among these, one valve rod 27 a is inserted into a cylindrical trunnion 28, and the trunnion 28 is inserted into one boss 4 a provided on one side of the valve box 4. One end of one valve rod 27a is inserted and connected to one boss portion 6b of the cut valve valve body 6, and the other end of one valve rod 27a is interlocked and connected to the first operating device 8. ing. The other end of the valve rod 27 b is fixed to the valve box sleeve 5, and the free end is inserted into the other boss 6 c of the cut valve body 6.

  The seal valve body 7 is supported by a seal valve valve rod 29 and the trunnion 28 so as to be rotatable around a rotation axis 19 coaxial with the cut valve valve body 6. The seal valve valve rod 29 is rotatably inserted into the other boss portion 4 b provided on the other side portion of the valve box 4, and one end portion of the seal valve valve rod 29 is one arm portion of the seal valve valve body 7. It is inserted and connected to the base end of 7b. The other end of the seal valve valve rod 29 is linked to the second operating device 9. Further, the base end portion of the other arm portion 7 c of the seal valve body 7 is fitted and held rotatably on the outer peripheral portion of the trunnion 28.

  As shown in FIG. 5, a gap 31 is formed between the outer surface of the cut valve body 6 and the inner peripheral surface of the valve box sleeve 5 from the upper end opening 13 side to the pair of valve rods 27a and 27b. Has been. The cut valve valve seat 24 blocks the inlet side of the gap 31 over the entire circumference.

Hereinafter, the operation of the above configuration will be described.
As shown in FIG. 3, when transferring coal granular material to the gasification furnace 81 from a state in which the cut valve body 6 and the seal valve body 7 are closed, first, the pressure equalizing valve 119 is opened, and the composite valve The pressure on the downstream side and the upstream side of 1 is equalized.

  Next, the second operating unit 9 is actuated to rotate the seal valve valve rod 29, and the seal valve valve body 7 is rotated from the fully closed position S to the fully open position O as shown by the phantom line in FIG. . As a result, the seal valve body 7 is rotated by 90 ° about the rotation axis 19 and retracted between the inner peripheral surface of the valve box 4 and the outer peripheral surface of the valve box sleeve 5 at the fully open position O, The lower end opening 14 of the sleeve 5 is opened.

  Next, the first operating device 8 is operated to rotate the cut valve valve rod 27, and the cut valve valve body 6 is rotated from the fully closed position S to the fully open position O as shown in FIG. As a result, the cut valve body 6 rotates 90 ° about the rotation axis 19 and retreats to the retreat space 21 in the valve box sleeve 5 at the fully open position O, so that the valve body opening 6d of the cut valve body 6 is obtained. Overlaps the upper end opening 13 of the valve box sleeve 5, and the upper end opening 13 is opened.

  As a result, the coal particles in the hopper 84 pass through the upper opening 13 and the valve opening 6d of the cut valve valve 6 from the valve box inlet 10 of the composite valve 1 to the valve box sleeve 5. , Flows through the lower end opening 14, flows into the supply pipe 116 from the valve box outlet 11, and is transferred from the supply pipe 116 to the gasifier 81 by the nitrogen generated from the air separation device 85.

  As described above, when the cut valve valve body 6 rotates to the fully open position O, the cut valve valve body 6 at the fully open position O retreats to the retreat space 21, so that the flow of the coal powder in the valve box sleeve 5 occurs. Is reduced, and the coal particles flow smoothly through the valve box sleeve 5. At this time, the cut valve valve seat 24 is in sliding contact with the first seat surface 6e so as to surround the periphery of the valve body opening 6d of the cut valve valve body 6.

  Further, as shown in FIG. 3, the upper opening 13 of the valve box sleeve 5 is cut by operating the first operating device 8 and rotating the cut valve body 6 from the fully open position O to the fully closed position S. The valve body 6 is closed. Further, the lower operating portion 14 of the valve sleeve 5 is closed by the seal valve valve body 7 by operating the second operating device 9 to rotate the seal valve valve body 7 from the fully open position O to the fully closed position S. The

  Further, at the fully open position O and the fully closed position S of the cut valve valve body 6, as shown in FIG. 5, the cut valve valve seat 24 blocks the inlet side of the gap 31 over the entire circumference. Thereby, it is possible to prevent a part of the coal granular material from flowing into the valve rods 27a and 27b through the gap 31, and the coal granular material is rotated each time the valve rods 27a and 27b rotate. Biting into the sliding portion A can be prevented.

Next, a second embodiment of the present invention will be described with reference to FIGS.
In the first embodiment, the composite valve 1 is connected to the bottom of the hopper 84 via the connecting pipe 115. However, in the second embodiment, the connecting pipe 115 is not provided, and FIG. 7, the composite valve 1 is directly connected to the bottom of the hopper 40.

  That is, the hopper 40 has a bottom opening 40a and a bottom flange 40b at the bottom. The inner peripheral surface of the bottom opening 40a is formed as a bottom conical surface 40c (conical section shape portion) whose diameter decreases toward the bottom.

  The valve box 4 of the composite valve 1 has a valve box inlet 10 and an inlet-side flange 43 at the top. An inlet-side tapered surface 44 is formed from the inner peripheral surface of the valve box inlet 10 to the inner peripheral surface of the upper end opening 13 of the valve box sleeve 5. The diameter of the inlet side tapered surface 44 is reduced from the upper side (that is, the valve box inlet 10 side) to the lower side (that is, the upper end opening 13 side).

  The bottom flange portion 40b of the hopper 40 and the inlet side flange portion 43 of the composite valve 1 are connected by bolts and nuts. The inlet-side tapered surface 44 is inclined at the same angle as the bottom conical surface 40c of the hopper 40 and is continuous with the bottom conical surface 40c.

  The pressure equalizing pipe 118 communicates with the bottom of the hopper 40 and the supply pipe 116. Moreover, although the entrance side taper surface 44 inclines at the same angle as the bottom part cone surface 40c of the hopper 40, it does not necessarily need to be the same angle.

Hereinafter, the operation of the above configuration will be described.
In the case where the coal powder is transferred to the gasification furnace 81 from the state where the cut valve body 6 and the seal valve body 7 are closed, first, the pressure equalizing valve 119 is opened, and the downstream side and the upstream side of the composite valve 1 are opened. And even pressure. Next, as shown by the phantom line in FIG. 7, the seal valve body 7 is rotated from the fully closed position S to the fully open position O, and then the cut valve body 6 is fully closed as shown by the solid line in FIG. Rotate from position S to fully open position O.

  Thereby, the coal granular material stored in the hopper 40 flows into the valve box inlet 10 through the bottom opening 40a. At this time, since the inlet-side tapered surface 44 of the composite valve 1 is continuous with the bottom conical surface 40c of the hopper 40, the inflow of coal powder into the valve box 4 is promoted. In addition, since the lower part of the bottom conical surface 40c can be replaced (also used) with the inlet side tapered surface 44, the height of the bottom conical surface 40c can be reduced, and the overall height of the hopper 40 can be reduced. It can be made smaller.

  In each said embodiment, although the granular material of coal was mentioned as an example of the fluid, the granular material other than coal may be sufficient. Moreover, although nitrogen gas was mentioned as an example of a gas body, gas other than nitrogen gas may be sufficient.

It is the longitudinal cross-sectional view seen from the front side of the composite valve in the 1st Embodiment of this invention. It is a XX arrow line view in FIG. 1, and shows the state which opened the cut valve valve body and the seal valve body. It is a XX arrow line view in Drawing 1, and shows the state where a cut valve valve element and a seal valve valve element were fully closed. It is a perspective view of the cut valve body of a composite valve. It is an enlarged view of the cut valve valve body part in FIG. It is a figure of the pipe line system for coal granular material transfer which provided the compound valve in the 2nd Embodiment of this invention. It is sectional drawing of a composite valve. It is a figure of the pipe line system for coal granular material transfer which provided the conventional compound valve. It is a sectional view of the composite valve, the right half from the center line shows a state where the cut valve body and the seal valve body are fully closed, and the left half is the cut valve body and the seal valve body fully opened. Indicates the state. FIG. 10 is a view taken along the line XX in FIG. 9, (a) shows a state where the cut valve body and the seal valve body are fully closed, and (b) shows a state where the cut valve body is fully closed, The body is fully opened. It is a XX arrow line view in FIG. 9, and shows the state which opened the cut valve valve body and the seal valve body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compound valve 4 Valve box 5 Valve box sleeve 6 Cut valve body (1st valve body)
6d Valve body opening 6e First seat surface 7 Seal valve body (second valve body)
7d Second seat surface 10 Valve box inlet 11 Valve box outlet 13 Upper end opening (one end opening)
14 Lower end opening (other end opening)
19 Rotating shaft center 21 Retraction space 24 Cut valve valve seat (first valve seat)
25 Seal valve seat (second valve seat)
27a, 27b Valve stem 31 Clearance 44 Inlet side taper surface

Claims (4)

A tubular valve box sleeve is provided in a valve box having a valve box inlet and a valve box outlet,
One end opening of the valve box sleeve communicates with the valve box inlet, the other end opening of the valve box sleeve opens in the valve box and faces the valve box outlet,
In the valve box sleeve, a rotatable first valve body that opens and closes one end opening of the valve box sleeve and a retreat space are provided,
The evacuation space extends radially outward from one end opening of the valve sleeve,
A rotatable second valve body for opening and closing the other end opening of the valve box sleeve is provided in the valve box,
The second valve body is retracted between the inner periphery of the valve box and the outer periphery of the valve sleeve in the open position;
The first valve body is retracted to a retracting space in the valve box sleeve in the open position. On the inner peripheral surface of the valve box, an inlet side tapered surface is formed from the valve box inlet to one end opening of the valve box sleeve,
2. The composite valve according to claim 1, wherein the inlet-side tapered surface has a diameter that decreases from the valve box inlet side toward the one end opening of the valve box sleeve. The first valve body has a spherical first seat surface on the outside,
The second valve body has a spherical second seat surface inside,
The valve box sleeve is provided with an annular first valve seat that is in sliding contact with the first seat surface, and a second valve seat that is in sliding contact with the second seat surface. Or the compound valve of Claim 2. The first valve body has a valve body opening that communicates with one end opening of the valve box sleeve in the open position and retracts from the one end opening of the valve box sleeve in the closed position;
A pair of valve stems is provided for rotatably supporting the first valve body around an axial center in a direction transverse to the flow direction in the valve box sleeve;
The first valve seat is formed between the outer side of the first valve body and the inner peripheral surface of the valve sleeve, and extends all around the inlet side of the gap that continues from the one end opening side of the valve sleeve to the valve stem side. The composite valve according to claim 3, wherein the inflow of the granular fluid into the gap is prevented.

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