CN110848408A

CN110848408A - Compensable sealing plug valve

Info

Publication number: CN110848408A
Application number: CN201911200167.1A
Authority: CN
Inventors: 郑建军; 李泽玉; 张�浩; 郑坤明; 林利平; 张阳秀; 王志明
Original assignee: ZHEJIANG FURUIKE FLOW CONTROL MACHINERY CO Ltd
Current assignee: ZHEJIANG FURUIKE FLOW CONTROL MACHINERY CO Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-02-28

Abstract

The invention discloses a compensable sealing plug valve which comprises a valve body, a valve cover and a valve rod, wherein a valve cavity communicated with an inlet end and an outlet end is arranged in the valve body, a plug body is arranged at one end, in the valve cavity, of the valve rod, a lining is arranged between the plug body and the valve body, the cross section area of one end, far away from the valve rod, of the plug body is smaller than that of one end, close to the valve rod, of the plug body, one end, far away from the plug body, of the valve rod is in key connection with a driving device capable of driving the valve rod to rotate, an adjusting pressure plate is arranged at one end, outside the valve body, of the valve rod, a first fastening piece. The invention has the following advantages and effects: the plug valve has a compensable sealing structure, and the problem of sealing failure caused by abrasion between the plug and the bushing after long-term use can be solved, so that the service life of the plug valve is prolonged.

Description

Compensable sealing plug valve

Technical Field

The invention relates to a plug valve, in particular to a compensable sealing plug valve.

Background

The plug valve is a rotary valve in a closing part or a plunger shape, and the opening or the closing of the valve is realized by rotating 90 degrees to enable a passage port on the plug to be communicated with or separated from a passage port on the valve body. The valve plug can be cylindrical or conical in shape, and the channel is trapezoidal.

Chinese patent with publication number CN204961883U discloses a plug valve, including valve body, cock and valve gap, be equipped with the valve pocket in the valve body, the cock is located the valve pocket, and the top of cock is connected with the cock pole, the valve body forms for alloy steel preparation, the cock forms for ceramic manufacture, be the cylinder cooperation between cock and the valve body, be equipped with the swivel liner on the contact surface of cock and valve body, the swivel liner top still is equipped with the sealing washer, the sealing washer top is equipped with the gland, the gland compresses tightly the sealing washer on the cock top, be equipped with the interface channel on the cock, the access & exit size of interface channel matches with the size of valve pocket passageway. The prior art realizes the sealing fit between the cock and the valve body through the use of the rotary bushing, and effectively prevents the medium from leaking.

However, the sealing surface of the bushing that contacts the plug is easily worn during the opening and closing of the plug for a long time, which results in the sealing between the plug and the bushing being lost and leakage occurring, and thus is desired to be improved.

Disclosure of Invention

The invention aims to provide a compensable sealing plug valve which is provided with a compensable sealing structure and can solve the problem of sealing failure caused by abrasion between a plug and a bushing after long-term use, thereby prolonging the service life of the plug valve.

The technical purpose of the invention is realized by the following technical scheme: the utility model provides a but compensation formula sealing plug valve, includes valve body, valve gap and valve rod, the inside valve pocket that is provided with and gets into the end and discharge end and be linked together of valve body, the valve rod is provided with the cock body in the one end of valve pocket, is provided with the bush between cock body and the valve body, the one end cross-sectional area that the valve rod was kept away from to the cock body is less than the cross-sectional area that is close to valve rod one end, the one end key-type connection that the cock body was kept away from to the valve rod has and can drive the valve rod and carry out pivoted drive arrangement, the valve rod is provided with adjusting plate in the outer one end of valve body, first fastener.

The invention is further provided with: the valve rod is provided with the spacing groove in the outer one end of valve body, the spacing inslot is provided with to the ring, wear out outside the spacing groove to the one end of ring, adjust the clamp plate cover and locate on the valve rod and adjust the bottom of clamp plate and expose the spacing groove outside to the ring looks butt.

The invention is further provided with: be provided with the sealing packing subassembly between valve rod and the valve gap, the sealing packing subassembly is including supreme second packing ring, packing pad, first packing ring and the packing pressure cover that sets gradually down, one side and the valve gap looks butt of packing pad are kept away from to the second packing ring.

The invention is further provided with: the valve cover is provided with a compensation mechanism which can drive the sealing packing component to compress so as to increase the sealing performance between the valve cover and the valve rod, the compensation mechanism comprises a packing pressing plate which is abutted against the upper end face of the packing pressing plate, a second fastener penetrates through one side of the packing pressing plate, and one end of the second fastener is in threaded fit with the valve cover.

The invention is further provided with: the plug body is arranged in a round table shape or a cone shape.

The invention is further provided with: the valve rod is fixedly connected with a sealing compensation pressing plate at one end outside the valve body, the bottom of the sealing compensation pressing plate is abutted against the upper end face of the sealing filler assembly, a third fastener penetrates through one side of the sealing compensation pressing plate, and one end of the third fastener is in threaded fit with the valve cover.

The invention is further provided with: the plug body, the valve cover and the valve body jointly surround to form a gap for the plug body to rotate.

The invention is further provided with: the safety valve further comprises a safety mechanism, wherein the safety mechanism comprises a telescopic pipe assembly, one end of the telescopic pipe assembly is fixedly connected with the valve rod, the other end of the telescopic pipe assembly is fixedly connected with the sealing compensation pressing plate, a containing cavity is formed in the telescopic pipe assembly, and a plurality of expansion beads which can expand when meeting the volume of a medium are arranged in the containing cavity; a guide pipe penetrates through one side of the sealing compensation pressure plate, one end of the guide pipe is communicated with the inner cavity of the telescopic pipe assembly, and the other end of the guide pipe penetrates through the valve cover to be communicated with the gap.

The invention is further provided with: the telescopic pipe assembly comprises a telescopic sleeve seat fixedly connected with the valve rod, the inner wall of the telescopic sleeve seat is horizontally and slidably connected with a telescopic sleeve, the inner wall of the telescopic sleeve is horizontally and slidably connected with a sliding sleeve, one end of the sliding sleeve is fixedly connected with a sealing compensation pressing plate, the outer wall of one end, close to the telescopic sleeve seat, of the telescopic sleeve and the outer wall of one end, close to the sliding sleeve, of the telescopic sleeve are provided with outer edges, and the inner edges, used for abutting against the outer edges, of the telescopic sleeve seat and one end, close to the sliding.

The invention is further provided with: the medium can be an aqueous medium or an oily medium, and the expanded beads can be made of high water absorption resin or high oil absorption resin.

In conclusion, the invention has the following beneficial effects: after the plug valve is used for a long time, the sealing surface matched with the plug body and the bushing is abraded, so that the leakage probability is improved. At the moment, an operator only needs to rotate the first fastening piece on the adjusting pressure plate, so that one end of the first fastening piece is screwed into the valve cover. And then the adjusting pressure plate is driven to move towards the valve cover. Specifically, the following are mentioned: the valve rod in this application is in adopting the key-type connection with drive arrangement, and the valve rod can carry out axial removal and guarantee to receive drive arrangement's drive all the time. The plug body that the in-process that the regulation clamp plate moved can drive valve rod and valve rod one end simultaneously moves towards the direction of bush, and the plug body is the big little structure of one end, and its one end cross-sectional area of keeping away from the valve rod is less than the cross-sectional area that is close to valve rod one end. The contact area between the plug body and the lining is gradually increased when the plug body moves towards the direction of the lining, so that the plug body is tightly attached to the lining to increase the specific sealing pressure.

Drawings

FIG. 1 is a schematic structural view of a plug valve according to a first embodiment;

FIG. 2 is an enlarged partial schematic view of area A of FIG. 1;

FIG. 3 is a schematic structural view of a plug valve according to the second embodiment;

FIG. 4 is a schematic structural view of the extension tube assembly of FIG. 3;

fig. 5 is an exploded schematic view of the structure of fig. 4.

Reference numerals: 1. a valve body; 2. a valve cover; 3. a valve stem; 4. a plug body; 5. a drive device; 6. adjusting the pressure plate; 7. a first fastener; 8. a limiting groove; 9. opening the ring; 10. a seal packing assembly; 11. a second gasket; 12. a filler pad; 13. a first gasket; 14. pressing and sleeving the filler; 15. a compensation mechanism; 16. a packing press plate; 17. a second fastener; 18. a support; 19. sealing the compensation pressing plate; 20. a third fastener; 21. a gap; 22. a safety mechanism; 23. a telescoping tube assembly; 24. expanding the beads; 25. a conduit; 26. a telescopic sleeve seat; 27. a telescopic sleeve; 28. a sliding sleeve; 29. an outer edge; 30. an inner edge; 31. a bushing; 32. a belleville spring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

as shown in fig. 1-2, a compensable sealing plug valve comprises a valve body 1, a valve cover 2 and a valve rod 3, wherein a valve cavity communicated with an inlet end and an outlet end is arranged inside the valve body 1, a plug body 4 is arranged at one end of the valve rod 3 in the valve cavity, a bushing 31 is arranged between the plug body 4 and the valve body, and the cross-sectional area of one end, far away from the valve rod 3, of the plug body 4 is smaller than that of one end, close to the valve rod 3.

The end of the valve rod 3 far away from the plug body 4 is keyed with a driving device 5 which can drive the valve rod 3 to rotate. The valve rod 3 is provided with adjusting pressure plate 6 in the outer one end of valve body 1, and first fastener 7 is worn to be equipped with in one side of adjusting pressure plate 6, and the one end and the 2 screw-thread fit of valve gap of this first fastener 7.

After the plug valve is used for a long time, the probability of leakage is improved because the sealing surface of the bush 31 matched with the plug body 4 is abraded. At this time, the operator only needs to rotate the first fastening member 7 on the adjusting pressure plate 6, so that one end of the first fastening member 7 is screwed into the valve cover 2. And the adjusting pressure plate 6 is driven to move towards the valve cover 2. Specifically, the following are mentioned: the valve rod 3 in this application is in adopting the key-type connection with drive arrangement 5, and valve rod 3 can carry out axial removal and guarantee to receive drive arrangement 5's drive all the time. The plug body 4 of the valve rod 3 and one end of the valve rod 3 can be synchronously driven to move towards the direction of the bushing 31 in the moving process of the adjusting pressure plate 6, the plug body 4 is of a structure with one large end and one small end, and the cross section area of one end, far away from the valve rod 3, of the plug body is smaller than that of one end, close to the valve rod 3. The plug body 4 is caused to gradually increase the contact area with the bushing 31 when moving towards the bushing 31, so that the plug body 4 is tightly attached to the bushing 31 to increase the specific sealing pressure.

Furthermore, the movable fit between the adjusting pressure plate 6 and the valve rod 3 can be realized. The valve rod 3 is provided with a limiting groove 8 at one end outside the valve body 1, a split ring 9 is arranged in the limiting groove 8, and one end of the split ring 9 penetrates out of the limiting groove 8. The adjusting pressure plate 6 is sleeved on the valve rod 3, and the bottom of the adjusting pressure plate 6 is abutted with the split ring 9 exposed out of the limiting groove 8.

Through the arrangement, the split ring 9 and the adjusting pressure plate 6 are detachable. When the sealing specific pressure between the plug body 4 and the lining 31 needs to be adjusted, the valve does not need to be shut down and disassembled, the sealing performance of the parts inside the valve body 1 can be adjusted only by additionally installing the parts, and the operation and the use are greatly facilitated.

Further, be provided with sealed packing subassembly 10 between valve rod 3 and valve gap 2, this sealed packing subassembly 10 is including the second packing ring 11, the packing pad 12, first packing ring 13 and the packing pressure cover 14 that set gradually from supreme down, and one side that packing pad 12 was kept away from to second packing ring 11 is with valve gap 2 looks butt. Through the setting of sealing packing subassembly 10, the sealing performance between multiplicable valve rod 3 and valve gap 2 to stop the medium and spill over from between valve rod 3 and the valve gap 2, increase medium transmission stability.

Further, the valve cap 2 is provided with a compensation mechanism 15 which can drive the packing seal assembly 10 to compress so as to increase the sealing performance between the valve cap 2 and the valve rod 3.

Furthermore, the compensation mechanism 15 comprises a packing pressing plate 16 which is abutted against the upper end face of the packing pressing sleeve 14, a second fastening piece 17 is arranged on one side of the packing pressing plate 16 in a penetrating mode, and one end of the second fastening piece 17 is in threaded fit with the valve cover 2. Through rotating second fastener 17, and then make one end precession in the valve gap 2 of second fastener 17 to drive packing clamp plate 16 and move towards the direction of valve gap 2, and then support and press packing and press cover 14, make sealing packing subassembly 10 compress in order to increase the sealing performance between valve gap 2 and the valve rod 3. Specifically, the following are mentioned: the two ends of the sealing packing assembly 10 are respectively abutted by the packing press plate 16 and the valve cover 2, the valve cover 2 is stationary, and the packing press plate 16 is movable. When the distance between the packing pressing plate 16 and the valve cover 2 is reduced, the packing assembly 10 can be extruded, so that the effect of compensating the sealing performance between the valve rod 3 and the valve cover 2 is realized.

Further, the plug body 4 is arranged in a circular truncated cone shape or a conical shape.

Further, a bracket 18 is arranged on the valve cover 2, the driving device 5 is arranged on the bracket 18, and one end of the valve rod 3 penetrates through the bracket 18 to be connected with the driving device 5 in a key mode.

Further, a belleville spring 32 is arranged between the adjusting pressure plate 6 and the first fastening piece 7, one end of the belleville spring 32 is fixedly connected with the adjusting pressure plate 6, and the other end of the belleville spring 32 is fixedly connected with the first fastening piece 7. The belleville spring 32 is in a compressed state in the absence of a leak in the plug valve.

When the plug valve leaks, the specific sealing pressure after abrasion in the valve is smaller than the necessary specific pressure. The spring pressure is released by the belleville spring 32 to urge the valve stem to move toward the bushing, thereby ensuring the sealing performance and prolonging the service life of the valve. Meanwhile, when the sealing pressure released by the belleville spring is not enough to ensure the sealing performance of the valve, the valve is solved for online leakage by tightening the first fastening member 7 to apply an external force. In the above, the adjusting pressure plate 6 and the belleville spring 32 form a sealing specific pressure compensation function combining self force and applied force.

Further, one end of the plug body 4 is abutted against the valve cover 2. This application adopts contact valve gap cock body structure, and valve gap 2 is direct to be served the sealed specific pressure that increases the valve promptly with the power when just adorning on 4 big head planes of cock body, has also eliminated the phenomenon of the loss of sealed specific pressure between cock body 4 and the bush 31 that cock body 4 caused to 3 axial direction removal of valve rod because of medium pressure differential's reason effectively.

Example two:

the difference from the embodiment is that: as shown in fig. 3-5, a sealing compensation pressure plate 19 is fixedly connected to an end of the valve stem 3 outside the valve body 1, and a bottom of the sealing compensation pressure plate 19 abuts against an upper end surface of the sealing packing assembly 10. One side of the sealing compensation pressure plate 19 is penetrated with a third fastener 20, and one end of the third fastener 20 is in threaded fit with the valve cover 2.

By the above arrangement of the sealing compensation pressing plate 19 and the third fastening member 20, when one end of the third fastening member 20 is screwed into the bonnet 2 to reduce the distance between the sealing compensation pressing plate 19 and the bonnet 2. The valve rod 3 and the plug body 4 at one end of the valve rod 3 can be synchronously driven to move towards the bush 31 so as to increase the sealing contact surface between the plug body 4 and the bush 31 and increase the specific sealing pressure. In addition, the seal compensation pressure plate 19 can also compress the seal packing assembly 10 to increase the sealing performance between the valve stem 3 and the bonnet 2. The sealing performance between the valve rod 3 and the valve cover 2 and between the plug body 4 and the bushing 31 can be realized only by one sealing compensation pressing plate 19.

Further, a gap 21 for the plug body 4 to rotate is formed between the plug body 4 and the valve cover 2 and between the plug body and the valve body 1. The gap 21 is free of medium entering the valve chamber in the event of a medium leak, due to the sealing action of the bushing 31 and the sealing packing assembly 10 at both ends of the gap 21. And take place wearing and tearing when the sealed face between bush 31 and the cock body 4 after long-term use, and then when leading to the medium to leak, the medium of valve intracavity can get into in this clearance 21, if sealed packing subassembly 10 still can not realize the sealed time between valve rod 3 and the valve gap 2 this moment, the medium can leak outside the plug valve, if the medium of transmission is when inflammable, explosive, poisonous hazardous articles, can have the potential safety hazard and cause the emergence of accident.

It should be noted that, in the above technical solutions, the fastener needs to be manually rotated to enhance the internal sealing of the valve. The leakage of the medium is sudden and accidental and random, and the operator has no time to strengthen the sealing in the valve when the leakage occurs or even close the valve, so a safety mechanism 22 is needed to solve the problem.

Further, the safety mechanism 22 is further included, the safety mechanism 22 includes a telescopic pipe assembly 23, one end of the telescopic pipe assembly 23 is fixedly connected with the valve rod 3, and the other end of the telescopic pipe assembly 23 is fixedly connected with the sealing compensation pressure plate 19. Bellows assembly 23 has a chamber therein which contains a plurality of expandable beads 24 which expand in volume upon exposure to a medium.

A guide pipe 25 penetrates through one side of the sealing compensation pressure plate 19, one end of the guide pipe 25 is communicated with the inner cavity of the telescopic pipe assembly 23, and the other end of the guide pipe 25 penetrates through the valve cover 2 to be communicated with the gap 21.

When a sudden leak hazard occurs in the valve, the operator has no time to close the valve. The valve contents enter the gap 21 and are pushed under the valve contents pressure into the conduit 25 thereby pushing the contents into the chamber of the bellows assembly 23 and into contact with the expanding bead 24 within the chamber. The expansion bead 24 expands when it meets the medium, and the top valve rod 3, the bellows assembly 23 on both sides, which is in contact with the expansion bead 24, is fixed in position, while the bellows assembly 23 can only move in its circumferential direction, and the seal compensation pressure plate 19, which is in contact with the expansion bead 24, is relatively movable.

It should be further noted that both ends of the telescopic tube assembly 23 are fixedly connected to the valve rod 3 and the seal compensation pressure plate 19, respectively, and the telescopic tube assembly 23 extends axially. So that the expansion bead 24 exerts a force on the sealing compensation pressing plate 19 toward the bonnet 2 during the expansion process, thereby shortening the distance between the sealing compensation pressing plate 19 and the bonnet 2 to realize the sealing performance between the valve rod 3 and the bonnet 2 and between the plug body 4 and the bushing 31.

In the above process, the plug body 4 is moved towards the bush 31 by the valve rod 3, so that the size of the gap 21 formed by the plug body 4, the bonnet 2 and the valve body 1 together in a surrounding manner is enlarged, and once the gap 21 is enlarged, the residual medium in the conduit 25 partially flows back into the gap 21. By this process, the expanded beads 24 are gradually released from contact with the medium, and the volume of the expanded beads 24 is reduced after the expanded beads are gradually naturally dried. Furthermore, the residual medium located in the gap 21 is also naturally dried.

Further, the telescopic pipe assembly 23 comprises a telescopic sleeve seat 26 fixedly connected with the valve rod 3, the inner wall of the telescopic sleeve seat 26 is horizontally and slidably connected with a telescopic sleeve 27, the inner wall of the telescopic sleeve 27 is horizontally and slidably connected with a sliding sleeve 28, and one end of the sliding sleeve 28 is fixedly connected with the sealing compensation pressure plate 19.

The outer wall of one end of the telescopic sleeve 27 and the sliding sleeve 28 close to the telescopic sleeve seat 26 is provided with an outer edge 29, and the end of the telescopic sleeve seat 26 and the telescopic sleeve 27 close to the sliding sleeve 28 is provided with an inner edge 30 for abutting against the outer edge 29.

Further, one end of the expansion bead 24 is in contact with the seal-compensating pressure plate 19.

Further, the medium may be an aqueous medium or an oily medium, and the corresponding expanded beads 24 may be made of a super absorbent resin or a super absorbent resin.

The specific embodiments are only for explaining the present invention, and the present invention is not limited thereto, and those skilled in the art can make modifications without inventive contribution to the present embodiments as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. The utility model provides a but compensation formula sealing plug valve, includes valve body (1), valve gap (2) and valve rod (3), the valve pocket that valve body (1) inside was provided with and gets into end and discharge end and is linked together, valve rod (3) one end in the valve pocket is provided with cock body (4), be provided with bush (31) between cock body (4) and valve body (1), the one end key-type connection that cock body (4) were kept away from in valve rod (3) has can drive valve rod (3) and carry out pivoted drive arrangement (5), its characterized in that: the cross-sectional area of one end of the plug body (4) far away from the valve rod (3) is smaller than the cross-sectional area close to one end of the valve rod (3), the valve rod (3) is provided with an adjusting pressing plate (6) at one end outside the valve body (1), a first fastening piece (7) is arranged on one side of the adjusting pressing plate (6) in a penetrating mode, and one end of the first fastening piece (7) is in threaded fit with the valve cover (2).

2. A compensable sealed plug valve according to claim 1, wherein: the valve rod (3) is provided with spacing groove (8) in the outer one end of valve body (1), be provided with in spacing groove (8) and run out spacing groove (8) outward, the one end of running out spacing groove (9) outward, adjusting plate (6) cover is located on valve rod (3) and the bottom of adjusting plate (6) and the outer ring (9) looks butt that runs out spacing groove (8) that run from opposite directions of barely.

3. A compensable sealed plug valve according to claim 2, wherein: be provided with between valve rod (3) and valve gap (2) sealed packing subassembly (10), sealed packing subassembly (10) are including follow supreme second packing ring (11), packing pad (12), first packing ring (13) and the packing pressure cover (14) that set gradually down, one side and valve gap (2) looks butt of packing pad (12) are kept away from in second packing ring (11).

4. A compensable sealed plug valve according to claim 3, wherein: the valve cover (2) is provided with a compensation mechanism (15) capable of driving the sealing packing component (10) to compress to increase the sealing performance between the valve cover (2) and the valve rod (3), the compensation mechanism (15) comprises a packing pressing plate (16) which is abutted to the upper end face of a packing pressing sleeve (14), a second fastener (17) is arranged on one side of the packing pressing plate (16) in a penetrating mode, and one end of the second fastener (17) is in threaded fit with the valve cover (2).

5. A compensable sealed plug valve according to claim 1, wherein: the plug body (4) is arranged in a circular truncated cone shape or a conical shape.

6. A compensable sealed plug valve according to claim 3, wherein: the valve rod (3) is in the outer sealed pressure compensating plate (19) of one end fixedly connected with of valve body (1), the bottom of sealed pressure compensating plate (19) is contradicted in the up end of sealed packing subassembly (10), third fastener (20) are worn to be equipped with in one side of sealed pressure compensating plate (19), the one end and valve gap (2) screw-thread fit of third fastener (20).

7. The compensable sealed plug valve of claim 6, wherein: the plug body (4), the valve cover (2) and the valve body (1) jointly surround to form a gap (21) for the plug body (4) to rotate.

8. The compensable sealed plug valve of claim 7, wherein: the safety valve is characterized by further comprising a safety mechanism (22), wherein the safety mechanism (22) comprises a telescopic pipe assembly (23), one end of the telescopic pipe assembly (23) is fixedly connected with the valve rod (3), the other end of the telescopic pipe assembly (23) is fixedly connected with a sealing compensation pressing plate (19), a containing cavity is formed in the telescopic pipe assembly (23), and a plurality of expansion beads (24) which can expand when meeting media in volume are arranged in the containing cavity; a guide pipe (25) penetrates through one side of the sealing compensation pressure plate (19), one end of the guide pipe (25) is communicated with the inner cavity of the telescopic pipe assembly (23), and the other end of the guide pipe (25) penetrates through the valve cover (2) to be communicated with the gap (21).

9. The compensable sealed plug valve of claim 8, wherein: extension tube subassembly (23) including with valve rod (3) fixed connection's flexible cover seat (26), the inner wall horizontal sliding connection of flexible cover seat (26) has telescopic tube (27), telescopic tube (27) inner wall horizontal sliding connection has sliding sleeve (28), the one end and sealed compensation clamp plate (19) fixed connection of sliding sleeve (28), telescopic tube (27) and sliding sleeve (28) are close to the one end outer wall of flexible cover seat (26) and are provided with outer fringe (29), the one end that telescopic tube seat (26) and telescopic sleeve (27) are close to sliding sleeve (28) is provided with inner edge (30) that are used for conflicting outer fringe (29).

10. A compensable sealed plug valve according to claim 9, wherein: the medium can be an aqueous medium or an oily medium, and the expanded beads (24) can be made of a super absorbent resin or a super oil absorbent resin.