JP2016102517A - Fire Safety valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire safety valve capable of keeping its basic valve function even if a diaphragm is damaged by extinction or deterioration under a high temperature atmosphere such as fire and the like.SOLUTION: This invention comprises a body 11 having an upper body 21 and a lower body 31 and a diaphragm arranged between both members, and fluid flowing from an upstream side part 33 toward a downstream part 34 is controlled by ascending or descending of a pressing part 44 at the extremity end of a valve rod 41. The body 11 and the pressing part 44 have heat resistance. The pressing part 44 has a closing close contact part 45 capable of closing a flow passage under a close contacted state of the lower body 31 under a damaged state in which the diaphragm is extinct and modified due to high temperature. Under the damaged state, the valve rod 41 is fastened down to a further lower emergency valve closing position 49 than the valve closing position 48 before its damage, the pressing part 44 is closely contacted with the lower body 13 to stop flow of fluid.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fire safety valve that can be used even when the operating environment of the valve is in a high temperature atmosphere such as when a fire breaks out.

Conventionally, as a diaphragm valve, in particular, a diaphragm valve used for a fire hydrant loaded on a ship, the one disclosed in Patent Document 1 is known.
The diaphragm valve of Patent Document 1 includes a valve rod above the diaphragm, and adjusts the opening degree of the flow path from the upstream side to the downstream side by raising and lowering the valve rod. Since this diaphragm is mainly composed of rubber, when it is in a high-temperature atmosphere such as in the event of a fire, the diaphragm dissolves and part or all of it disappears or deteriorates. Or damage. As a result, the function as a valve may be lost, or fluid leakage may occur.

Correspondingly, it is possible to change the material of the diaphragm to one with high heat resistance, but when it is placed in a high temperature atmosphere for a long time, such as in the event of a fire, while maintaining the good valve function of the diaphragm In addition, it is difficult to completely eliminate the possibility of breakage.

Registered Utility Model No. 3121151

The present invention provides a fire safety valve capable of maintaining a basic valve function even when a diaphragm is damaged such as being extinguished or altered in a high temperature atmosphere such as a fire. Let it be an issue. Another object of the present invention is to suppress leakage from the diaphragm valve in a high temperature atmosphere.

The present invention includes a body having a flow path through which fluid can pass from an upstream portion to a downstream portion, a diaphragm arranged in the flow path, and moving the diaphragm to open and close the flow path The valve stem is provided with a screw shaft that can be moved up and down by a screwing operation, and a pressing portion that is provided at the tip of the screw shaft and abuts against the upper surface of the diaphragm. It will be improved and provided with a fire safety function.
In the fire safety valve according to the present invention, the body and the pressing portion are provided with heat resistance. The pressing portion has a close structure capable of closing the flow path by being in close contact with the body in a damaged state in which the diaphragm has disappeared and deteriorated at a high temperature. Thereby, when the diaphragm is in the damaged state, the valve rod is tightened to the emergency valve closing position further lower than the valve closing position before the damage, the pressing portion is brought into close contact with the body, It has a structure capable of stopping the flow of fluid between the upstream portion and the downstream portion.
As a result, even under a damaged state in a high temperature atmosphere, the body can be brought into close contact with the pressing portion by closing the valve stem, and the valve closed state can be maintained.

The present invention can be implemented as the body in which the upper body and the lower body are joined. The upper body includes the valve chamber and a valve holding portion that supports the valve rod above the valve chamber, and the lower body includes the upstream portion and the downstream portion with a central portion interposed therebetween. Can be formed.
In such a body structure, the diaphragm valve is sandwiched between the upper body and the lower body. The upstream portion includes an upstream opening that opens to the upstream side of the central portion, the downstream portion includes a downstream opening that opens to the downstream side of the central portion, and the upstream portion is opened in the state where the flow path is opened. The opening and the downstream opening are conducted through the valve chamber, and the closing close part that is in close contact with the opening edge of the upstream opening and the downstream opening at the emergency valve closing position in the damaged state is the pressing It can be implemented as being formed on the lower surface of the part.

Accordingly, the diaphragm valve in which the peripheral portion is supported by being sandwiched between the upper body and the lower body, the peripheral portion functions as a packing, and prevents leakage from between the upper body and the lower body. Although the function is fulfilled, there is a possibility that the function of the packing may be impaired under the damaged condition. Even under such a broken state, a closing close portion that is in close contact with the opening edge of the upstream opening and the downstream opening is formed on the lower surface of the pressing portion at the emergency valve closing position. Fluid flow can be blocked on the body side.

Further, the present invention includes an opening close contact portion on at least one of the upper surface of the pressing portion and the valve stem, and by raising the valve stem in the damaged state, the opening close contact portion Can be implemented as having a structure in close contact with the body to prevent fluid leakage from around the valve stem.
As a result, even when the high temperature atmosphere is damaged, the valve stem can be raised so that the valve can be opened, and the fluid flowing through the flow path is prevented from leaking from around the valve stem. can do.

Further, in the present invention, the lower body includes a receiving seat that supports a lower surface of the peripheral portion of the diaphragm valve, and a fixed stem that presses the upper surface of the peripheral portion of the diaphragm valve is inserted into the fixed stem of the upper body. It is arranged in a hole and tightens the fixed stem to fix the periphery of the diaphragm between the lower end of the fixed stem and the seat, and the fixed stem has a hole close contact portion, The hole intimate portion can be brought into close contact with the fixed stem insertion hole of the upper body to prevent leakage of fluid from around the fixed stem.
As a result, leakage from around the fixed stem for fixing the diaphragm can be suppressed.

In the present invention, the fixed stem has an upper end protruding from the upper body, a handle is provided at the upper end of the fixed stem, and the handle is lifted and rotated to rotate the fixed stem to the tool. It can also be implemented as being able to be tightened without.
As a result, the handle operation of the fixed stem can be performed without a tool, so that it is easy to deal with an emergency such as a fire.

Further, according to the present invention, the upper body includes a cover portion on the entire outer periphery thereof, the cover portion includes a close contact portion that is in close contact with the lower body, and the close contact portion of the cover portion is in close contact with the body. In this state, the upper body and the lower body can be assembled.
As a result, the upper body and the lower body are in a state of high sealing performance on the entire circumference of the joint surface, and it is possible to suppress fluid leakage from between the upper body and the lower body even in a damaged state of the diaphragm. Can do.

According to the present invention, an opening adjustment bolt that defines the ascending position of the valve stem is disposed in the opening adjustment bolt hole of the upper body, and the opening adjustment bolt includes a bolt contact portion, The bolt tightly contacting portion can be brought into close contact with the opening adjusting bolt hole of the upper body to prevent leakage of fluid from around the opening adjusting bolt.

The present invention provides a fire safety valve capable of maintaining the basic valve function even when the diaphragm is damaged such as being extinguished or altered in a high temperature atmosphere such as a fire. Was able to.
In addition, the present invention has been able to provide a fire safety valve that can suppress fluid leakage from the diaphragm valve in a high temperature atmosphere.

The half sectional view which looked at the fire safety valve concerning an embodiment of the invention from the side. A half cross section of the same fire safety valve as seen from above. FIG. 3 is a half sectional view of the same fire safety valve taken along the center vertical center line of FIG. 2. The principal part sectional drawing which cut | disconnected the fire safety valve at the center side of FIG. The half sectional view which looked at the fire safety valve concerning other embodiments of the present invention from the side.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Overview)
The fire safety valve 10 according to this embodiment is a diaphragm valve having a function of adjusting the flow rate of various fluids, and in this example, a fire safety valve that is suitable for use as a fire hydrant used as ship equipment is shown. The present invention should not be understood as being limited to fire hydrants.

The fire safety valve 10 includes a body 11 in which an upper body 21 and a lower body 31 are assembled, a diaphragm 12 that opens and closes a flow path in the body 11 and adjusts a flow rate, and a valve rod 41 that raises and lowers the diaphragm 12. Prepare.
The lower body 31 includes an upstream portion 33 on the right side of the central portion 32 in FIG. 1 and a downstream portion 34 on the left side. The upstream portion 33 and the downstream portion 34 are respectively cylindrical spaces, and the upstream opening 35 and the downstream opening 36 are opened in the lower body 31 with the central portion 32 interposed therebetween. The upstream part 33 and the downstream part 34 have an upstream end 37 and a downstream end 38 at their respective tips, and each is connected to the movable flow path by another fixed installation flow path or hose. The form of the upstream end 37 and the downstream end 38 can be variously changed according to the application and the mounting position. For example, the upstream end 37 may be provided below as shown in FIG. 5 may be provided with an upstream end 37 in the lateral direction.

The upper body 21 includes a valve chamber 22 positioned above the central portion 32, the upstream opening 35, and the downstream opening 36, and is stretched in a state where the diaphragm 12 is sandwiched between the upper body 21 and the lower body 31. ing. A valve rod 41 is disposed above the valve chamber 22. The valve stem 41 includes a screw shaft 42, an operation portion 43 provided on the upper end side thereof and protruding from the upper body 21, and a pressing portion 44 provided on the lower end side thereof. The screw shaft 42 is held by a valve holding portion 23 provided in the upper body 21 so as to be movable up and down. The screw shaft 42 and the valve holding portion 23 have male and female screws, and the screw shaft 42 is moved up and down by rotating the operation portion 43 by working clothes. By this raising and lowering, the pressing portion 44 moves up and down in the valve chamber 22, whereby the diaphragm 12 in contact with the lower surface of the pressing portion 44 is raised and lowered to open and close the valve.

In the closed state, the diaphragm 12 is in close contact with the peripheral edge of the upstream opening 35 and the downstream opening 36 to close the flow path. In the valve open state, the diaphragm 12 is separated from the upstream opening 35 and the downstream opening 36 to open the flow path, so that the fluid from the upstream portion 33 (water in this example) flows from the upstream opening 35 to the valve above the central portion 32. It flows from the downstream opening 36 to the downstream portion 34 through the chamber 22, and the flow rate can be adjusted by the degree of the rise of the diaphragm 12.

(Fire response)
The above-mentioned form is a general form as a diaphragm valve, and the body 11 (the upper body 21 and the lower body 31), the valve rod 41, the pressing part 44, and the like are made of a metal having high heat resistance such as casting. . On the other hand, sealing means such as the diaphragm 12 and the O-ring is inferior in heat resistance such as rubber. In addition, the heat resistance in this invention means providing heat resistance of the grade which maintains the original objective of a valve function under the temperature conditions at the time of a fire.
The rubber diaphragm 12 is melted and disappeared or deteriorated under a high temperature condition such as a fire. Since the conventional diaphragm valve has not been sufficiently adapted to the case where the diaphragm 12 is in a broken state, the present invention provides the fire safety valve 10 that ensures the correspondence. .

(When water does not pass in case of fire)
First, a means for ensuring a closed valve state in a damaged state will be described.
In general, the upper body 21 and the lower body 31 are fixed by the assembly bolts 27 so that the assembled state is maintained. The peripheral edge portion 13 of the diaphragm 12 is fixed by a fixed stem 51. Specifically, the lower surface of the peripheral portion 13 is supported by a receiving seat 39 of the lower body 31, and an annular diaphragm retainer 14 is disposed on the upper surface of the peripheral portion 13. The diaphragm retainer 14 is retained from above by a fixed stem 51. It has been. The fixed stem 51 is supported by a fixed stem insertion hole 52 provided in the upper body 21 so as to be movable up and down. The fixed stem 51 and the fixed stem insertion hole 52 are formed with a male screw and a female screw. By tightening the fixed stem 51, the diaphragm holder 14 presses the entire periphery of the diaphragm 12 against the seat 39, and the peripheral portion of the diaphragm 12. 13 is fixed.

As a result, under normal conditions, the upstream opening 35 and the downstream opening 36 on the lower body 31 side, and the diaphragm 12 stretched on the upper body 35, regardless of whether the valve is closed or open, Thus, the fluid does not leak to the upper body 21 side or the outside. However, when the diaphragm 12 is in a damaged state, the fluid flows above the diaphragm 12 and leaks to the outside through various paths.

Therefore, as shown in FIG. 3, the lower surface of the pressing portion 44 is used as a close contact portion 45, and the pressing portion 44 is brought into close contact with each opening edge of the upstream opening 35 and the downstream opening 36 (shown only in FIG. 2). As a result, even when the diaphragm 12 disappears, the valve closed state can be maintained. That is, under normal conditions, the valve stem 41 remains down to the valve closing position 48, but in a damaged state in which the diaphragm 12 disappears and deteriorates at a high temperature, the valve stem 41 is further tightened to the emergency valve closing position 49 below. The closing close portion 45 on the lower surface of the pressing portion 44 is brought into close contact with the opening edge of the upstream opening 35 and the opening edge of the downstream opening 36 in the lower body 31 to close the upstream opening 35 and the downstream opening 36. This stops the fluid flow and its leakage.

Therefore, the shape of the lower surface of the pressing portion 44 that becomes the closing close portion 45 is a surface defined by a circle such as a hemispherical shape, a conical shape, a truncated cone shape, and the other closing close contact portion 45 and the closing close contact portion 45. Each opening edge with the portion 45 is also an opening surface defined by a circle such as a hemispherical shape, a conical shape, or a truncated cone shape that is in close contact with the lower surface of the pressing portion 44. Further, the screw shaft 42 and the valve holding portion 23 of the upper body 21 are provided with screws in a range in which the valve rod 41 can be lowered to the emergency valve closing position 49.

(When water flows in case of fire)
When water flows in the event of a fire, the flow path will be open, so fluid can flow even if slight leakage occurs, but there is no leakage from each part, etc. Is unlikely to occur. Therefore, in this embodiment, the countermeasure for suppressing leakage from each part when water is passed in the event of a fire is performed as follows.

(Corresponding to leakage from around the valve stem 41)
An O-ring or the like is also arranged between the valve stem 41 and the upper body 21 to cope with a normal fluid leakage. However, in the event of a fire, the O-ring may be dissolved and lost. is there.

In view of this, in this embodiment, the valve rod 41 is raised to the valve open state (fully open state), so that the fluid leakage from around the valve rod 41 can be suppressed.
Specifically, the opening pressing portion close contact portion 46 is formed on the outer periphery of the upper surface of the pressing portion 44. The opening pressing portion close contact portion 46 is a continuous annular plane portion. Corresponding to the opening pressing portion close contact portion 46, the valve chamber 22 of the upper body 21 is also provided with a step portion 24, and the lower surface of the step portion 24 is formed in an annular flat portion. Thereby, it was set as the structure which suppresses that a fluid leaks upward rather than the press part 44, when plane parts closely_contact | adhere.

In addition to this, a valve stem close contact portion 47 for opening is also formed on the valve stem 41. The opening valve stem close contact portion 47 has a flange shape with a tapered annular flat surface portion on the outer surface near the lower end of the valve stem 41. Correspondingly, the lower surface near the lower end of the valve holding portion 23 of the upper body 21 is a tapered planar portion. Thereby, it was set as the structure which suppresses that a fluid leaks upwards rather than the valve stem 41, when plane parts closely_contact | adhere.
The opening pressing portion close contact portion 46 and the opening valve stem close contact portion 47 may be implemented by only one of them, but in this example, for the sake of completeness, a leakage prevention structure is provided at two locations. It is.

(Corresponding to leakage from around fixed stem 51)
As described above, regarding the valve stem 41, different measures were taken according to the two types of correspondence between the case of not passing water and the case of passing water in the event of a fire. Regardless of whether it is an effective response.
First, as shown in FIG. 4, a hole close portion 53 is formed in the fixed stem 51 in order to prevent fluid from leaking from between the fixed stem 51 and the fixed stem insertion hole 52. The hole close contact portion 53 is a tapered flat portion formed on the lower surface of the step portion in the middle of the fixed stem 51. Correspondingly, a step portion is also formed in the fixed stem insertion hole 52, and A tapered planar portion was provided on the upper surface. Thereby, it was set as the structure which suppresses that a fluid leaks upwards rather than the valve rod 41, when plane parts closely_contact | adhere. By forming the stepped portion, the fixed stem 51 and the fixed stem insertion hole 52 have an upper diameter larger than the lower diameter of the stepped portion. In this example, male screws are formed on both upper and lower sides. ing.
In a normal use state, the lower end of the fixed stem 51 presses the peripheral portion 13 of the diaphragm 12 via the diaphragm retainer 14. Even in this state, the hole close portion 53 of the fixed stem 51 is substantially in close contact with the step portion of the fixed stem insertion hole 52. However, since the diaphragm 12 is made of rubber, the hole close portion is set to ensure the tightening. In some cases, both of the tapered planar portions of 53 and the fixed stem insertion hole 52 are not in close contact with each other, and a slight gap exists. In such a case, when leakage occurs from around the fixed stem 51, the fixed stem 51 is further tightened so that both tapered flat portions of the hole close contact portion 53 and the fixed stem insertion hole 52 are in close contact with each other.

In order to perform this emergency operation without tools, it is desirable to provide a handle 54 on the upper part protruding from the lower body 31 of the fixed stem 51. The handle 54 may be in various forms, but in this example, the handle 54 is attached so as to be rotatable up and down. In addition, the handle 54 is normally suspended, and the fixed stem 51 can be rotated while the handle 54 is pulled up in the event of a fire.

(Corresponding to leakage from between upper body 21 and lower body 31)
When the diaphragm 12 is in a damaged state, there is a risk of leakage from between the upper body 21 and the lower body 31. Therefore, a cover portion 25 is provided on the entire outer periphery of the upper body 21 (see FIGS. 3 and 4). In the conventional body 11, since the diaphragm 12 ensures the sealing between the upper body 21 and the lower body 31, the upper body 21 and the lower body 31 are assembled in a state where there is no complete sealing. It was. On the other hand, in this embodiment, the cover portion 25 is provided on the entire outer periphery of the upper body 21, and the lower surface thereof is a close contact portion 26 that is a flat portion, and also on the upper surface of the lower body 31. An annular planar portion was formed. By this, it is set as the structure which suppresses that a fluid leaks from between the upper body 21 and the lower body 31 by clamping | tightening and fixing with the assembly | attachment bolt 27 so that both plane parts may contact | adhere. .

(Responding to leakage from the opening adjustment bolt 61)
Depending on the model, there may be provided an opening adjustment bolt 61 that defines the raised position of the valve stem 41 during normal use (see FIG. 3). The opening adjustment bolt 61 is inserted into and supported by an opening adjustment bolt hole 63 on the upper body 21 side. In the example of the figure, the opening adjustment bolt hole 63 is implemented as being formed in a bush 65 that is mounted integrally with the upper body 21. The opening adjustment bolt 61 adjusts the protruding length into the valve chamber 22 so as to come into contact with the raised pressing portion 44 so that the pressing portion 44 cannot be raised any further. The degree of opening is adjusted. In FIG. 3, the length of the opening adjustment bolt 61 is drawn relatively long. However, when actually installed, the opening adjustment bolt 61 is cut to a size according to individual use conditions, etc. Used to set the degree position.

In this embodiment, in order to suppress leakage around the opening adjustment bolt 61, the bolt contact portion 62 is formed on the opening adjustment bolt 61. The bolt contact portion 62 is a tapered flat portion formed on the lower surface of the step portion of the opening adjustment bolt 61, and correspondingly, a tapered flat surface on the opening edge 64 of the opening adjustment bolt hole 63. A part was provided. Accordingly, the planar portion is in close contact with the opening adjustment bolt 61 being tightened to the lower limit position, thereby preventing fluid from leaking upward from the bolt contact portion 62. Further, by providing a cover 66 that covers the periphery of the opening adjustment bolt 61 in close contact with the upper body 21, even when fluid leaks from around the opening adjustment bolt 61, leakage to the outside is caused by the cover 66. It is suppressed.

(Example of change)
The present invention can be implemented with various modifications in addition to the examples described above.
For example, the planar portion constituting each of the intimate portions is configured to increase the contact area by being implemented as a tapered shape, but can also be implemented as a step portion orthogonal to the axial direction.
In addition, the planar portion constituting each of the intimate portions is such that one intimate contact is provided on the upper surface and the other intimate contact is provided on the lower surface. The other may be provided on the upper surface.
Moreover, although it is preferable that it is a fire safety valve provided with all the above-mentioned means, even if it is provided with only a part of the means, it improves the fluid leakage compared with the one not provided at all. It can be implemented with various modifications depending on the conditions under which the valve is used.
The positional relationship such as up, down, left, and right in the present invention is relative, and the absolute position is changed depending on the mounting position and direction of the fire safety valve.

DESCRIPTION OF SYMBOLS 10 Fire safety valve 11 Body 12 Diaphragm 13 Peripheral part 14 Diaphragm presser 21 Upper body 22 Valve chamber 23 Valve holding part 24 Step part 25 Cover part 26 Close part 27 Assembly bolt 31 Lower body 31 Central part 33 Upstream part 34 Downstream part 35 Upstream opening 36 Downstream opening 37 Upstream end 38 Downstream end 39 Receiving seat 41 Valve rod 42 Screw shaft 43 Operation part 44 Pressing part 45 Closing close part 46 Opening pressing part close part 47 Opening valve stick close part 48 Valve closing position 49 Emergency valve closing position 51 Fixed stem 52 Fixed stem insertion hole 53 Close hole 54 Handle 61 Opening adjustment bolt 62 Close bolt 63 Opening adjustment bolt hole 64 Opening edge 65 Bush 66 Cover

Claims (7)

A body internally provided with a flow path through which fluid can pass from upstream to downstream;
A diaphragm coordinated in the flow path;
A valve stem for moving the diaphragm to open and close the flow path,
The valve stem is a screw shaft that can be raised and lowered by a screwing operation;
A diaphragm valve provided at a tip of the screw shaft and having a pressing portion that comes into contact with an upper surface of the diaphragm,
The body and the pressing part have heat resistance,
The pressing portion has a close structure capable of closing the flow path by close contact with the body in a damaged state in which the diaphragm disappears and deteriorates at high temperature,
When the diaphragm is in a damaged state, the valve rod is tightened to an emergency valve closing position that is further lower than the valve closing position before the damage, the pressing portion is brought into close contact with the body, the upstream portion and the downstream portion Fire safety valve with a structure that can stop the flow of fluid between the two parts. The body is obtained by joining an upper body and a lower body,
The upper body includes a valve chamber and a valve holding portion that supports the valve rod above the valve chamber,
The lower body is formed with the cylindrical upstream portion and the cylindrical downstream portion with a central portion in between,
The diaphragm valve has a peripheral portion sandwiched between the upper body and the lower body,
The upstream portion includes an upstream opening that opens to the upstream side of the central portion,
The downstream portion includes a downstream opening that opens downstream from the central portion,
With the flow path opened, the upstream opening and the downstream opening are conducted through the valve chamber,
2. A close contact portion for closing, which is in close contact with an opening edge between the upstream opening and the downstream opening at the emergency valve closing position in the damaged state, is formed on the lower surface of the pressing portion. The described fire safety valve. At least one of the upper surface of the pressing portion and the valve stem is provided with a close contact portion for opening,
2. The structure according to claim 1, further comprising a structure in which, in the damaged state, the valve stem is raised so that the opening close contact portion is brought into close contact with the body to prevent fluid leakage from around the valve stem. Item 3. A fire safety valve according to item 1 or 2. The lower body includes a receiving seat that supports a lower surface of the peripheral portion of the diaphragm valve,
A fixed stem that presses against an upper surface of the peripheral portion of the diaphragm valve is disposed in a fixed stem insertion hole of the upper body;
The fastening stem is tightened, and the periphery of the diaphragm is fixed between the lower end of the stationary stem and the seat.
The fixed stem includes a hole intimate portion;
3. The fire safety valve according to claim 2, wherein, in the damaged state, the hole contact portion is brought into close contact with the fixed stem insertion hole of the upper body to prevent fluid leakage from around the fixed stem. The fixed stem has an upper end protruding from the upper body,
5. The fire safety valve according to claim 4, wherein a handle is provided at the upper end of the fixed stem, and the fixed stem can be tightened without a tool by lifting and rotating the handle. . The upper body has a cover portion on the entire outer periphery thereof,
The cover portion includes a close portion that is in close contact with the lower body,
The fire safety valve according to any one of claims 2 to 5, wherein the upper body and the lower body are assembled in a state where the close portion of the cover portion is in close contact with the body. An opening adjustment bolt that defines the raised position of the valve stem is disposed in the opening adjustment bolt hole of the upper body,
The opening adjustment bolt includes a bolt close contact portion,
The said bolt close part is made to closely_contact | adhere to the said opening degree adjustment bolt hole of the said upper body under the said damage state, The leak of the fluid from the said opening degree adjustment bolt periphery is prevented. A fire safety valve according to any one of the above.

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