CN213541492U - Double-sealing device for inner cavity of packing box of valve rod of control valve - Google Patents
Double-sealing device for inner cavity of packing box of valve rod of control valve Download PDFInfo
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- CN213541492U CN213541492U CN202022347916.8U CN202022347916U CN213541492U CN 213541492 U CN213541492 U CN 213541492U CN 202022347916 U CN202022347916 U CN 202022347916U CN 213541492 U CN213541492 U CN 213541492U
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- valve cover
- valve rod
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Abstract
The utility model relates to a double sealing device for an inner cavity of a stuffing box of a valve rod of a control valve, which comprises a valve cover; the valve rod is inserted in the valve cover; the first-level packing is positioned at the bottom of the gap between the valve rod and the valve cover and is suitable for sealing the valve rod and the valve cover; the downward pressing sleeve is positioned in the gap between the valve rod and the valve cover and is positioned on the upper part of the first-stage filler; the upper pressing sleeve is positioned at the gap between the valve rod and the valve cover and is positioned at the upper part of the lower pressing sleeve; the compression nut is in threaded connection with the inner wall of the valve cover and is suitable for transmitting the pressing force to the first-stage filler through the upper pressure sleeve and the lower pressure sleeve; the secondary packing is positioned in the gap between the upper pressing sleeve and the valve rod; the packing gland comprises a fixed end and an insertion end, wherein the fixed end is connected with the top of the valve cover, and the insertion end is positioned at a gap between the compression nut and the valve rod; the lower static sealing injection port penetrates through the inner wall and the outer wall of the valve cover and is in through connection with the first annular groove on the lower pressure sleeve; when the first-stage packing leaks, a medium is injected into the first annular groove through the lower static seal injection port, so that the leakage is prevented from continuously moving upwards.
Description
Technical Field
The utility model relates to a seal structure of valve rod specifically is a control valve rod packing box inner chamber double seal device.
Background
In order to prevent the leakage of hydraulic oil at the gap between the valve rod and the valve cover, it is a conventional practice to add a sealing packing at the gap between the valve rod and the valve cover; however, in the long-term use process of the control valve, the sealing filler is damaged or aged, so that leakage occurs, and the sealing performance of the whole control valve is further influenced;
the conventional method is to replace the sealing filler, so that the control valve needs to be integrally disassembled, and the time for replacing the sealing filler is increased;
how to repair the leakage position of the control valve when the control valve leaks becomes a problem which needs to be solved urgently by researchers of the company.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: how to repair the leakage position of the control valve when the control valve leaks;
in order to solve the technical problem, the utility model discloses a following technical scheme:
the utility model relates to a double sealing device for an inner cavity of a stuffing box of a valve rod of a control valve, which comprises a valve cover; a valve stem inserted in the valve cap; the first-stage packing is positioned at the bottom of the gap between the valve rod and the valve cover and is suitable for sealing the valve rod and the valve cover; the pressing sleeve is positioned in the gap between the valve rod and the valve cover and positioned on the upper part of the first-stage filler; the upper pressure sleeve is positioned in the gap between the valve rod and the valve cover and is positioned at the upper part of the lower pressure sleeve; the compression nut is in threaded connection with the inner wall of the valve cover and is suitable for transmitting the pressing force to the first-stage filler through the upper pressure sleeve and the lower pressure sleeve; the secondary packing is positioned in the gaps between the upper pressing sleeve and the valve rod and between the lower pressing sleeve and the valve rod; the packing gland comprises a fixed end and a plug-in end, wherein the fixed end is connected with the top of the valve cover, and the plug-in end is positioned in a gap between the compression nut and the valve rod and is suitable for compressing the secondary packing on the lower pressure sleeve; the lower static sealing injection port penetrates through the inner wall and the outer wall of the valve cover and is in through connection with the first annular groove in the lower pressing sleeve; when the first-stage packing leaks, a medium is injected into the first annular groove through the lower static seal injection port, so that the leakage is prevented from continuously moving upwards;
the device adopts double sealing of the primary packing and the secondary packing, so that the sealing performance of the control valve is improved; the first-stage filler is compressed and sealed by a compression nut, an upper pressure sleeve and a lower pressure sleeve which are arranged from top to bottom, and the compression force on the first-stage filler is adjusted by rotating the nut; the secondary packing is placed on the lower pressure sleeve, the top of the secondary packing is abutted against the insertion end of the packing gland, and the fixed end of the packing gland is fixed on the upper end face of the valve cover in a screw mode or the like;
the valve cover is provided with a lower static sealing injection port, the lower pressing sleeve is provided with a first annular groove, when leakage occurs in the first-stage packing, a medium is injected into the first annular groove through the lower static sealing injection port, and the medium can seal the gap so as to prevent leakage from continuously moving upwards.
When the first-level filler is further damaged in the using process and the medium injected into the lower static sealing injection port does not work at the moment, the inner wall and the outer wall of the valve cover are also provided with the pressurizing sealing injection port in a through way; the pressurizing sealing injection port is communicated with the second annular groove of the upper pressure sleeve; the upper pressing sleeve is also provided with a channel, one end of the channel is communicated with the second annular groove, and the other end of the channel is positioned in the gap between the upper pressing sleeve and the lower pressing sleeve; when the first-stage filler continues to leak, a medium is injected through the pressurizing sealing injection opening, and the medium passes through the second annular groove and the channel to the gap between the upper pressing sleeve and the lower pressing sleeve to drive the upper pressing sleeve and the lower pressing sleeve to separate, so that the first-stage filler is compressed;
a pressurizing sealing injection opening is formed in the valve cover, and a second annular groove and a channel are formed in the upper pressure sleeve; the three UNICOM in proper order transports the medium to the clearance department of supreme, push down the sheathed tube through the sealed filling opening of pressure boost, and the upper and lower sleeve pipe can be followed valve rod axis direction and do the back-to-back motion this moment, and then leads to the radial force increase of one-level filler to improved sealing performance, reached the one-level filler and further damaged, carried out the purpose of maintaining to it.
In order to improve the sealing performance of the upper and lower pressing sleeves, the utility model discloses a be provided with between upper and lower pressing sleeves and the valve gap and be used for sealed O type circle.
The utility model has the advantages that: the utility model relates to a double sealing device for the inner cavity of a packing box of a valve rod of a control valve, wherein a first-stage packing and a second-stage packing are sleeved on the valve rod, so that the double sealing effect is achieved, when the first-stage packing leaks out, a medium is injected into a first annular groove through a lower static sealing injection port, and the leakage is prevented from continuously moving upwards; under the condition of not disassembling the control valve, the leakage position can be repaired together, and the aim of maintenance is fulfilled.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of the present invention;
in the figure: 1-valve cover, 3-packing gland, 31-insertion end, 32-fixed end, 4-valve rod, 5-secondary packing, 6-primary packing, 7-pressing sleeve, 71-first annular groove, 8-gland nut, 9-lower static seal filling opening, 10-upper pressing sleeve, 101-second annular groove, 11-O-shaped ring, 12-pressurizing seal filling opening and 13-channel.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
As shown in figure 1, the utility model relates to a double sealing device for the inner cavity of a stuffing box of a valve rod of a control valve, which comprises a valve cover 1; a valve rod 4 inserted in the valve cover 1; the first-stage packing 6 is positioned at the bottom of the gap between the valve rod 4 and the valve cover 1 and is suitable for sealing the valve rod 4 and the valve cover 1; the pressing sleeve 7 is positioned in the gap between the valve rod 4 and the valve cover 1 and is positioned at the upper part of the first-stage packing 6; the upper pressing sleeve 10 is positioned at the gap between the valve rod 4 and the valve cover 1 and is positioned at the upper part of the lower pressing sleeve 7; the compression nut 8 is in threaded connection with the inner wall of the valve cover 1 and is suitable for transmitting the compression force to the first-stage packing 6 through the upper pressing sleeve 10 and the lower pressing sleeve 7; the secondary packing 5 is positioned at the gap between the upper pressing sleeve 10, the lower pressing sleeve 7 and the valve rod 4; the packing gland 3 comprises a fixed end 31 connected with the top of the valve cover 1 and an insertion end 32 positioned at the gap between the compression nut 8 and the valve rod 4, and the insertion end 32 is suitable for compressing the secondary packing 5 on the lower pressure sleeve 7; the lower static seal injection port 9 penetrates through the inner wall and the outer wall of the valve cover 1 and is in through connection with a first annular groove 71 on the lower pressure sleeve 7; when the first-stage packing 6 leaks, a medium is injected into the first annular groove 71 through the lower static seal injection port 9, so that the leakage is prevented from continuously moving upwards;
the device adopts double sealing of the primary packing and the secondary packing, so that the sealing performance of the control valve is improved; the first-stage filler is compressed and sealed by a compression nut, an upper pressure sleeve and a lower pressure sleeve which are arranged from top to bottom, and the compression force on the first-stage filler is adjusted by rotating the nut; the secondary packing is placed on the lower pressure sleeve, the top of the secondary packing is abutted against the insertion end of the packing gland, and the fixed end of the packing gland is fixed on the upper end face of the valve cover in a screw mode or the like;
the valve cover is provided with a lower static sealing injection port, the lower pressing sleeve is provided with a first annular groove, when leakage occurs in the first-stage packing, a medium is injected into the first annular groove through the lower static sealing injection port, and the medium can seal the gap so as to prevent leakage from continuously moving upwards.
As shown in fig. 1, when the primary packing is further damaged in the using process, and the medium injected from the lower static seal injection port does not work at this time, the inner and outer walls of the valve cover 1 of the utility model are also provided with a pressurizing seal injection port 12; the pressurizing sealing injection port 12 is communicated with a second annular groove 101 of the upper pressing sleeve 10; a channel 13 is further formed in the upper pressing sleeve 10, one end of the channel 13 is in through connection with the second annular groove 101, and the other end of the channel 13 is located in a gap between the upper pressing sleeve 10 and the lower pressing sleeve 7; when the first-stage filler 6 continues to leak, a medium is injected into the pressurizing sealing injection port 12, and the medium passes through the second annular groove 101 and the channel to the gap between the upper pressing sleeve 10 and the lower pressing sleeve 7 to drive the upper pressing sleeve 10 and the lower pressing sleeve 7 to separate, so that the first-stage filler 6 is compressed;
a pressurizing sealing injection opening is formed in the valve cover, and a second annular groove and a channel are formed in the upper pressure sleeve; the three UNICOM in proper order transports the medium to the clearance department of supreme, push down the sheathed tube through the sealed filling opening of pressure boost, and the upper and lower sleeve pipe can be followed valve rod axis direction and do the back-to-back motion this moment, and then leads to the radial force increase of one-level filler to improved sealing performance, reached the one-level filler and further damaged, carried out the purpose of maintaining to it.
As shown in figure 1, in order to improve the sealing performance of the upper and lower pressing sleeves, the utility model discloses a be provided with between upper and lower pressing sleeves 10, 7 and valve gap 1 and be used for sealed O type circle 11.
The utility model relates to a double sealing device for the inner cavity of a packing box of a valve rod of a control valve, wherein a first-stage packing and a second-stage packing are sleeved on the valve rod, so that the double sealing effect is achieved, when the first-stage packing leaks out, a medium is injected into a first annular groove through a lower static sealing injection port, and the leakage is prevented from continuously moving upwards; under the condition of not disassembling the control valve, the leakage position can be repaired together, and the aim of maintenance is fulfilled.
The utility model discloses an installation as follows:
1. firstly, inserting a valve rod 4 into an upper valve cover 1, wherein the up-and-down positioning size of the valve rod is determined according to the size of an internal part in an inner cavity of a valve body;
2. the primary packing 6 is placed along the valve stem 4 as shown in fig. 1;
3. the lower pressing sleeve 7 is sleeved with an O-shaped ring 11;
4. an O-shaped ring 11 is sleeved on the upper pressing sleeve 10;
5. the lower pressure sleeve 7 and the upper pressure sleeve 10 are put in along the valve rod 4;
6. the compression nut 8 is screwed in along the inner cavity of the upper valve cover and compresses the first-stage packing 6;
7. the secondary packing 5 is placed along the valve stem 4 as shown in the figure I;
8. putting a packing gland 3;
9. and (5) compressing the packing gland by using a compression bolt.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (3)
1. The utility model provides a control valve rod stuffing box inner chamber double seal device which characterized in that: comprises that
A valve cover;
a valve stem inserted in the valve cap;
the primary packing is positioned at the bottom of the gap between the valve rod and the valve cover and is suitable for sealing the valve rod and the valve cover;
the pressing sleeve is positioned in the gap between the valve rod and the valve cover and positioned on the upper part of the primary packing;
the upper pressing sleeve is positioned in the gap between the valve rod and the valve cover and positioned at the upper part of the lower pressing sleeve;
the compression nut is in threaded connection with the inner wall of the valve cover and is suitable for transmitting the compression force to the primary filler through the upper pressure sleeve and the lower pressure sleeve;
the secondary packing is positioned at the gap between the upper pressing sleeve and the valve rod, and between the lower pressing sleeve and the valve rod;
the packing gland comprises a fixed end and a fixed end, wherein the fixed end is arranged at the top of the valve cover, and an insertion end is arranged at a gap between the compression nut and the valve rod and is suitable for compressing the secondary packing on the pressing sleeve;
the lower static sealing injection port penetrates through the inner wall and the outer wall of the valve cover and is in through connection with the first annular groove in the lower pressure sleeve;
when the first-stage packing leaks, the medium is injected into the first annular groove through the lower static seal injection port, so that the leakage is prevented from continuously moving upwards.
2. A control valve stem stuffing box bore dual seal as in claim 1 wherein: the inner wall and the outer wall of the valve cover are also provided with a pressurizing sealing injection port in a penetrating way;
the pressurizing sealing injection port is communicated with the second annular groove of the upper pressure sleeve;
a channel is further formed in the upper pressing sleeve, one end of the channel is in through connection with the second annular groove, and the other end of the channel is located in a gap between the upper pressing sleeve and the lower pressing sleeve;
when the primary filler continuously leaks, a medium is injected into the pressurizing sealing injection opening and flows to the gap between the upper pressing sleeve and the lower pressing sleeve through the second annular groove and the channel to drive the upper pressing sleeve and the lower pressing sleeve to separate, so that the primary filler is compressed.
3. A control valve stem stuffing box bore dual seal as in claim 1 wherein: and O-shaped rings for sealing are arranged between the upper pressing sleeve and the valve cover and between the lower pressing sleeve and the valve cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022347916.8U CN213541492U (en) | 2020-10-20 | 2020-10-20 | Double-sealing device for inner cavity of packing box of valve rod of control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022347916.8U CN213541492U (en) | 2020-10-20 | 2020-10-20 | Double-sealing device for inner cavity of packing box of valve rod of control valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213541492U true CN213541492U (en) | 2021-06-25 |
Family
ID=76499013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022347916.8U Active CN213541492U (en) | 2020-10-20 | 2020-10-20 | Double-sealing device for inner cavity of packing box of valve rod of control valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213541492U (en) |
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2020
- 2020-10-20 CN CN202022347916.8U patent/CN213541492U/en active Active
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