CN213332946U - Flange type flow measurement orifice plate device - Google Patents
Flange type flow measurement orifice plate device Download PDFInfo
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- CN213332946U CN213332946U CN202022374946.8U CN202022374946U CN213332946U CN 213332946 U CN213332946 U CN 213332946U CN 202022374946 U CN202022374946 U CN 202022374946U CN 213332946 U CN213332946 U CN 213332946U
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Abstract
The utility model relates to the technical field of flow measuring devices, and provides a flange type flow measuring orifice plate device, which comprises an upstream pressure measuring flange, an upstream winding pad, an orifice plate, a downstream winding pad and a downstream pressure measuring flange which are sequentially arranged along the medium flow direction; the upstream pressure-taking flange is connected with the downstream pressure-taking flange through a fastener; the edge of the orifice plate is fixed with a handle which extends outwards along the radial direction of the orifice plate; the device also comprises a positioning pin which sequentially penetrates through the upstream pressure-taking flange, the handle and the downstream pressure-taking flange. Through setting up handle and locating pin, not only be convenient for take out the orifice plate between two flanges when overhauing, moreover when the repacking orifice plate, the position of orifice plate is carried out the accurate positioning to the cooperation of accessible locating pin and handle, compares with prior art, need not to adjust repeatedly the position of orifice plate, just can guarantee the axiality of orifice plate and flange, has reduced the operation degree of difficulty when the orifice plate is repacked, has improved workman's operating efficiency.
Description
Technical Field
The utility model belongs to the technical field of flow measuring device technique and specifically relates to a flange type flow measurement orifice plate device.
Background
Fig. 1 is a schematic structural view of a conventional flange-type orifice device for measuring flow rate. The flange type flow measurement orifice plate device comprises an upstream pressure taking flange 12, an upstream winding pad 13, an orifice plate 14, a downstream winding pad 15 and a downstream pressure taking flange 17, wherein the upstream pressure taking flange 12, the upstream winding pad 13, the orifice plate 14 and the downstream winding pad 15 are sequentially arranged along a fluid flow direction 10 and are used for being connected with an upstream pipeline 11; the upstream pressure-taking flange 12 and the downstream pressure-taking flange 17 are connected by fasteners 18, so that the upstream winding pad 13, the orifice plate 14 and the downstream winding pad 15 are clamped.
The flange type flow measurement orifice plate device is a measuring device which is used for being arranged on a pipeline to measure the flow of fluid. Although the existing flange type flow measurement orifice plate device has the characteristics of being detachable and wide in application, the orifice plate is limited mainly by bolts in fasteners in the installation process, so that the coaxiality between the orifice plate and the flange is not high, and the measurement precision of the device is further influenced. In addition, in the working process, the orifice plate is washed by fluid for a long time, so that the orifice hole on the orifice plate is easy to block or wear, the measurement accuracy of the device is further influenced, and a large measurement error is caused. Therefore, in order to ensure the measurement accuracy and reduce the measurement error, the device needs to repair or replace the orifice plate after working for a period of time.
The method for repairing the hole plate adopted at present comprises the following steps: firstly, removing a fastening piece between an upstream pressure-taking flange and a downstream pressure-taking flange, then respectively arranging chain blocks on two sides of the upstream pressure-taking flange and the downstream pressure-taking flange for traction so as to enable the upstream pressure-taking flange and the downstream pressure-taking flange to be away from each other, locking the chain blocks after the sealing surfaces of the upstream pressure-taking flange and the downstream pressure-taking flange can meet the requirement that the pore plates are easily taken out, and taking out the old pore plates for overhauling or replacing; and then installing the repaired or replaced orifice plate between the upstream winding pad and the downstream winding pad, loosening the chain block, and connecting the upstream pressure-taking flange and the downstream pressure-taking flange through a fastener.
However, the method for replacing the hole plate is not only complicated in construction, but also can apply acting force to the flange only by hooking the bolt hole on the flange by the hook on the chain block, so that the bolt hole is extremely easy to damage. In the process of reassembling the orifice plate, the position of the orifice plate needs to be adjusted manually for many times to improve the coaxiality between the orifice plate and the flanges, and because the orifice plate is completely positioned between the two flanges, the operation space is smaller, the operation difficulty is increased, and higher requirements are provided for the technical level of constructors. In addition, in the process of adjusting the position of the orifice plate, the orifice plate is easy to generate radial friction with the winding pad, so that the winding pad is damaged, and the cost is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a flange type flow measurement orifice plate device is provided to the operation degree of difficulty when reducing the orifice plate repacking.
The utility model provides a technical scheme that its technical problem adopted is: the flange type flow measurement orifice plate device comprises an upstream pressure measuring flange, an upstream winding pad, an orifice plate, a downstream winding pad and a downstream pressure measuring flange which are sequentially arranged along the flow direction of a medium; the upstream pressure measuring flange is connected with the downstream pressure measuring flange through a fastener;
a handle extending outwards along the radial direction of the orifice plate is fixed on the edge of the orifice plate; the positioning pin sequentially penetrates through the upstream pressure measuring flange, the handle and the downstream pressure measuring flange; and the upstream pressure taking flange, the handle and the downstream pressure taking flange are all provided with positioning holes for the positioning pins to pass through.
Further, the axial direction of the positioning pin is parallel to the axial direction of the upstream pressure-taking flange.
Furthermore, the inner end of the handle is connected with the pore plate in a welding mode.
Furthermore, a round hole is formed in the handle; the distance from the center of the round hole on the handle to the center of the orifice plate is L1; the distance from the center of the positioning hole in the handle to the center of the orifice plate is L2; wherein L1 is more than L2.
Further, the radius of the outer circle of the upstream pressure taking flange is R1; wherein L1 > R1.
Further, a jackscrew device is arranged between the upstream pressure measuring flange and the downstream pressure measuring flange; the jackscrew device comprises at least two jackscrew holes which are uniformly distributed on the upstream pressure-taking flange along the circumference, and jackscrew bolts which are in threaded connection with each jackscrew hole and the end parts of which are used for being abutted against the downstream pressure-taking flange.
The utility model has the advantages that: the utility model discloses flange type flow measurement orifice plate device, through setting up handle and locating pin, not only be convenient for when overhauing get the orifice plate from the upper reaches and press flange and low reaches to get and press and take out between the flange, and when first installation or repacking orifice plate, the cooperation of accessible locating pin and handle carries out the accurate positioning to the position of orifice plate, compare with prior art, need not to adjust repeatedly the position of orifice plate, just can guarantee the axiality of orifice plate and flange, the operation degree of difficulty when having reduced the orifice plate repacking, workman's operating efficiency has been improved. And when the upstream pressure-taking flange and the downstream pressure-taking flange are tightly connected through the fastener, the pore plate can be ensured not to radially shake, the radial friction between the pore plate and the winding pad is prevented, and the risk of damage of the winding pad is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below; it is obvious that the drawings in the following description are only some of the embodiments described in the present application, and that other drawings can be derived from these drawings by a person skilled in the art without inventive effort.
Fig. 1 is a schematic structural view of a conventional flange-type flow measurement orifice plate device;
fig. 2 is a schematic structural view of a flange-type flow measurement orifice plate device according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
FIG. 4 is a cross-sectional view B-B of FIG. 2;
FIG. 5 is an exploded view of FIG. 3;
fig. 6 is a schematic structural view of the connection between the orifice plate and the handle in the embodiment of the present invention.
The reference numbers in the figures are: 10-fluid flow direction, 11-upstream pipe, 12-upstream pressure-tapping flange, 13-upstream wound mat, 14-orifice plate, 15-downstream wound mat, 16-downstream pipe, 17-downstream pressure-tapping flange, 18-fastener;
20-fluid flow direction, 21-upstream pressure tapping flange, 22-upstream winding pad, 23-orifice plate, 24-downstream winding pad, 25-downstream pressure tapping flange, 26-fastener, 27-handle, 28-positioning pin, 29-positioning hole, 30-round hole, 31-jackscrew hole, 32-jackscrew bolt, 33-upstream pressure tapping hole and 34-downstream pressure tapping hole.
Detailed Description
In order to make the present invention better understood by those skilled in the art, the present invention will be further described with reference to the accompanying drawings and examples. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. In case of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.
The first embodiment is as follows:
fig. 2 to fig. 5 are schematic structural views of a flange-type flow measurement orifice plate device according to an embodiment of the present invention.
Referring to fig. 2 to 5, a flange-type flow measurement orifice plate device according to an embodiment of the present invention includes an upstream pressure measurement flange 21, an upstream winding pad 22, an orifice plate 23, a downstream winding pad 24, and a downstream pressure measurement flange 25, which are sequentially disposed along a fluid flow direction 20; the upstream pressure-taking flange 21 is connected with the downstream pressure-taking flange 25 through a fastener 26;
a handle 27 extending outwards along the radial direction of the orifice plate 23 is fixed on the edge of the orifice plate; the positioning pin 28 sequentially penetrates through the upstream pressure measuring flange 21, the handle 27 and the downstream pressure measuring flange 25; the upstream pressure-taking flange 21, the handle 27 and the downstream pressure-taking flange 25 are all provided with positioning holes 29 for the positioning pins 28 to pass through.
Referring to fig. 2 and 3, the upstream pressure-taking flange 21 is used for welding connection with an upstream pipeline. The upstream pressure-taking flange 21 is provided with an upstream pressure-taking hole 33 communicated with the inner cavity of the upstream pressure-taking flange. The upstream pressure tapping hole 33 is used for installing a pressure measuring device, and the pressure of the fluid in the upstream pressure tapping flange 21 is measured through the pressure measuring device.
The downstream pressure-taking flange 25 is used for being connected with a downstream pipeline in a welding mode. The downstream pressure-taking flange 25 is provided with a downstream pressure-taking hole 34 communicated with the inner cavity of the downstream pressure-taking flange. The downstream pressure tapping hole 34 is used for installing a pressure measuring device, and the pressure of the fluid in the downstream pressure tapping flange 25 is measured through the pressure measuring device.
The orifice plate 23 is a throttling element, and has a throttling hole with a flow area smaller than the inner cross-sectional area of the pipeline, the fluid in the pipeline can cause local contraction when passing through the throttling hole on the orifice plate 23, the flow velocity of the fluid is increased at the contraction position, the static pressure is reduced, so a certain pressure difference is generated before and after the orifice plate 23, and the flow of the fluid in the pipeline can be calculated by measuring the differential pressure before and after the orifice plate 23 and according to a functional relation between the differential pressure and the fluid flow.
The fasteners 26 are used to connect the upstream pressure-taking flange 21 with the downstream pressure-taking flange 25. The fasteners 26 comprise a plurality of studs which are uniformly distributed on the circumference and penetrate through bolt holes on the upstream pressure measuring flange 21 and the downstream pressure measuring flange 25, and nuts screwed at two ends of each stud.
The upstream pressure-taking flange 21 is connected with the downstream pressure-taking flange 25 through a fastener 26 so as to clamp the upstream winding pad 22, the orifice plate 23 and the downstream winding pad 24; and the sealing between the sealing surface of the upstream pressure-taking flange 21 and the orifice plate 23 is realized by the upstream winding pad 22, and the sealing between the sealing surface of the downstream pressure-taking flange 25 and the orifice plate 23 is realized by the downstream winding pad 24.
In this embodiment, the sealing surfaces of the upstream pressure-taking flange 21 and the downstream pressure-taking flange 25 are convex surfaces. The upstream winding pad 22 and the downstream winding pad 24 are both metal winding pads with inner and outer rings.
In the embodiment of the present invention, the upstream pressure-tapping flange 21 and the downstream pressure-tapping flange 25 can be replaced with each other according to the difference of the fluid flow direction 20. For example, referring to fig. 3, when the fluid flow direction 20 flows from left to right, the flange on the left side is the upstream pressure-taking flange 21, and the flange on the right side is the downstream pressure-taking flange 25; when the fluid flow direction 20 flows from right to left, the right flange becomes the upstream pressure-taking flange 21, and the left flange becomes the downstream pressure-taking flange 25.
Referring to fig. 5 and 6, the handle 27 is an elongated structure disposed along the radial direction of the orifice plate 23 and having an inner end fixedly connected to the edge of the orifice plate 23. The handle 27 is arranged, so that the orifice plate 23 can be conveniently taken out from between the upstream pressure taking flange 21 and the downstream pressure taking flange 25 when the handle 27 is held or the handle 27 is pulled through a pull rope during maintenance.
The handle 27 may be made of steel strip. For example, the handle 27 is made of a stainless steel band having a thickness of 10 mm. Preferably, the thickness of the steel strip is equal to the thickness of the perforated plate 23. The handle 27 and the orifice plate 23 can be connected by riveting, clamping or welding. For example, the inner end of the handle 27 is welded to the orifice plate 23.
According to the size of the orifice plate 23, the orifice plate 23 and the handle 27 can be connected by spot welding or full welding. For example, when the outer diameter of the orifice plate 23 is less than 250mm, the orifice plate 23 and the handle 27 may be connected by spot welding because the weight of the orifice plate 23 is small; when the outer diameter of the orifice plate 23 is greater than or equal to 250mm, the orifice plate 23 and the handle 27 are connected in a full-welding mode at two sides. During welding, attention should be paid to the control of the current and the cooling operation to avoid causing deformation of the orifice plate 23.
Referring to fig. 4 and 5, the positioning pins 28 are used for radially positioning the orifice plate 23. The upstream pressure-taking flange 21, the handle 27 and the downstream pressure-taking flange 25 are all provided with positioning holes 29 for the positioning pins 28 to pass through. Preferably, the axial direction of the positioning pin 28 is arranged parallel to the axial direction of the upstream pressure-taking flange 21.
Referring to fig. 5 and 6, a circular hole 30 is formed on the handle 27; the distance from the center of the round hole 30 on the handle 27 to the center of the orifice plate 23 is L1; the distance from the center of the positioning hole 29 on the handle 27 to the center of the orifice plate 23 is L2; wherein L1 is more than L2. The radius of the outer circle of the upstream pressure taking flange 21 is R1; wherein L1 > R1.
The round hole 30 is arranged, so that when the pore plate 23 is extracted through the pull rope, the pull rope passes through the round hole 30 to root the pull rope. By providing L1 > R1 to locate the circular hole 30 outside the gap between the two flanges, the operating space at the circular hole 30 is increased to facilitate the passage of a pull cord through the circular hole 30.
The flange type flow measuring orifice plate device of the embodiment of the utility model is firstly welded with the upstream pressure-taking flange 21 and the downstream pressure-taking flange 25 and the upstream pipeline when being installed, and in the process, the positioning holes 29 on the two flanges are controlled to be coaxially arranged and are both positioned right above the central line of the flanges; then placing the upstream winding pad 22, the orifice plate 23 and the downstream winding pad 24 between the upstream pressure-taking flange 21 and the downstream pressure-taking flange 25, and inserting positioning pins 28 into positioning holes 29 on the upstream pressure-taking flange 21, the handle 27 and the downstream pressure-taking flange 25 in sequence to radially position the orifice plate 23; then inserting the studs into the bolt holes of the upstream pressure measuring flange 21 and the downstream pressure measuring flange 25, and screwing nuts at two ends of the studs, so that the radial directions of the two winding pads are limited by the plurality of studs; and then the nuts are tightened to realize the connection of the upstream pressure-taking flange 21 and the downstream pressure-taking flange 25, and the upstream winding pad 22, the orifice plate 23 and the downstream winding pad 24 are clamped tightly to complete the installation of the flange type flow measurement orifice plate device.
The utility model discloses flange type flow measurement orifice plate device, through setting up handle 27 and locating pin 28, not only be convenient for take out orifice plate 23 from the upper reaches between pressure flange 21 and the low reaches pressure flange 25 of getting when overhauing, and when first installation or repacking orifice plate 23, accessible locating pin 28 and handle 27's cooperation, carry out the accurate positioning to the position of orifice plate 23, compare with prior art, need not to adjust repeatedly the position of orifice plate 23, just can guarantee the axiality of orifice plate 23 and flange, the operation degree of difficulty when having reduced the orifice plate repacking, workman's operating efficiency has been improved. And when the upstream pressure-taking flange 21 and the downstream pressure-taking flange 25 are tightly connected through the fastener 26, the orifice plate 23 can be ensured not to radially shake, the radial friction between the orifice plate 23 and the winding pad is prevented, and the risk of damage to the winding pad is avoided.
Example two:
fig. 4 to fig. 5 are schematic structural views of a flange-type flow measurement orifice plate device according to an embodiment of the present invention.
Referring to fig. 4 and 5, in the flange-type flow measurement orifice plate device provided in the embodiment of the present invention, a jackscrew device is disposed between the upstream pressure-taking flange 21 and the downstream pressure-taking flange 25; the jackscrew device comprises at least two jackscrew holes 31 which are uniformly distributed on the circumference and are arranged on the upstream pressure-taking flange 21, and jackscrew bolts 32 which are in threaded connection with each jackscrew hole 31 and the end parts of which are used for being abutted against the downstream pressure-taking flange 25.
The jackscrew device is arranged for increasing the distance between the sealing surfaces of the upstream pressure-taking flange 21 and the downstream pressure-taking flange 25 after the fasteners 26 between the upstream pressure-taking flange 21 and the downstream pressure-taking flange 25 are removed, so that the taking-out and the reinstallation work of the upstream winding pad 22, the orifice plate 23 and the downstream winding pad 24 are facilitated.
For example, the jackscrew device comprises two jackscrew holes 31 uniformly distributed on the circumference of the upstream pressure-taking flange 21, and the axial direction of each jackscrew hole 31 is parallel to the axial direction of the upstream pressure-taking flange 21; a section of internal thread section is arranged in each jackscrew hole 31, the jackscrew bolt 32 is in threaded connection with the internal thread section in the jackscrew hole 31, and the end part of the jackscrew bolt 32 is used for abutting against the downstream pressure-taking flange 25. Preferably, the jackscrew 32 is a full-thread bolt.
The length of the plug bolts 32 is determined based on the distance to be pushed open between the sealing surfaces of the upstream pressure-extracting flange 21 and the downstream pressure-extracting flange 25, and preferably, the length of the plug bolts 32 is at least 50mm longer than the thickness T of the upstream pressure-extracting flange 21.
The jackscrew bolts 32 should be sized based on the size of the flange; the larger the size of the flange, the larger the gauge of the jack screw bolt 32. For example, when the nominal diameter of the flange is less than 250mm, the jackscrew bolts 32 are of the specification M12; when the nominal diameter of the flange is greater than or equal to 250mm, the jack bolt 32 has a specification of M16 or M20 or greater.
The utility model discloses flange type flow measurement orifice plate device, when needs overhauld or change upstream winding pad 22, orifice plate 23 and low reaches winding pad 24, get rid of earlier fastener 26 between upper reaches pressure flange 21 and the low reaches pressure flange 25 of getting, then screw up jackscrew bolt 32, the tip of jackscrew bolt 32 and the low reaches pressure flange 25 butt, and then make the distance between the sealed face of upper reaches pressure flange 21 and low reaches pressure flange 25 increase to appropriate size; then removing the positioning pins 28, taking the upstream winding pad 22, the pore plate 23 and the downstream winding pad 24 out of the space between the upstream pressure-taking flange 21 and the downstream pressure-taking flange 25, and repairing or replacing the upstream winding pad 22, the pore plate 23 and the downstream winding pad 24; then arranging the repaired or replaced upstream winding pad 22, the pore plate 23 and the downstream winding pad 24 between the upstream pressure-taking flange 21 and the downstream pressure-taking flange 25, and sequentially inserting positioning pins 28 into positioning holes 29 on the upstream pressure-taking flange 21, the handle 27 and the downstream pressure-taking flange 25 to radially position the pore plate 23; then inserting the screw rods into the bolt holes on the two flanges, and screwing the nuts at two ends of the screw rods, so that the radial directions of the two winding pads are limited by the plurality of screw rods; then the jackscrew bolts 32 are loosened to the initial state, the nuts are tightened again, the connection of the two upstream pressure-taking flanges 21 and the downstream pressure-taking flange 25 is realized, and the upstream winding pad 22, the orifice plate 23 and the downstream winding pad 24 are clamped.
The utility model discloses flange type flow measurement orifice plate device, through setting up the jackscrew device, when needs overhaul orifice plate 23 or change, only need through screwing up jackscrew bolt 32, just can make the distance increase between the sealed face of upper reaches pressure flange 21 and low reaches pressure flange 25 of getting, so that easily take out orifice plate 23, compare with prior art, not only need not to set up chain block again, avoided the impaired risk of flange, easy operation, high reliability, construction convenience moreover. And, when the orifice plate 23 is reassembled, the orifice plate 23 is radially positioned through the positioning pin 28, so that the orifice plate 23 is ensured not to radially shake during loosening of the jackscrew bolt 32 and screwing of the nut, radial friction between the orifice plate 23 and the winding pad is prevented, and the risk of damage of the winding pad is avoided.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The flange type flow measurement orifice plate device comprises an upstream pressure measuring flange (21), an upstream winding pad (22), an orifice plate (23), a downstream winding pad (24) and a downstream pressure measuring flange (25) which are sequentially arranged along a fluid flow direction (20); the upstream pressure-taking flange (21) is connected with the downstream pressure-taking flange (25) through a fastener (26);
characterized in that a handle (27) extending outwards along the radial direction of the orifice plate (23) is fixed on the edge of the orifice plate; the device also comprises a positioning pin (28) which sequentially penetrates through the upstream pressure measuring flange (21), the handle (27) and the downstream pressure measuring flange (25); and the upstream pressure measuring flange (21), the handle (27) and the downstream pressure measuring flange (25) are respectively provided with a positioning hole (29) for the positioning pin (28) to pass through.
2. A flange-type flow measuring orifice device according to claim 1, characterized in that the axial direction of the positioning pin (28) is arranged parallel to the axial direction of the upstream pressure-taking flange (21).
3. A flange-type flow measuring orifice device according to claim 1, characterized in that the inner end of the handle (27) is welded to the orifice plate (23).
4. A flange-type flow measuring orifice device according to claim 1, characterized in that said handle (27) is provided with a circular hole (30); the distance from the center of the round hole (30) on the handle (27) to the center of the orifice plate (23) is L1; the distance from the center of the positioning hole (29) on the handle (27) to the center of the orifice plate (23) is L2; wherein L1 is more than L2.
5. The orifice device for flange-type flow measurement according to claim 4, characterized in that the radius of the outer circle of the upstream pressure-taking flange (21) is R1; wherein L1 > R1.
6. The orifice plate device according to any one of claims 1 to 5, characterized in that a jack screw device is provided between the upstream pressure-taking flange (21) and the downstream pressure-taking flange (25); the jackscrew device comprises at least two jackscrew holes (31) which are uniformly distributed on the circumference and are arranged on the upstream pressure-taking flange (21), and jackscrew bolts (32) which are in threaded connection with each jackscrew hole (31) and the ends of which are used for being abutted against the downstream pressure-taking flange (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202022374946.8U CN213332946U (en) | 2020-10-22 | 2020-10-22 | Flange type flow measurement orifice plate device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022374946.8U CN213332946U (en) | 2020-10-22 | 2020-10-22 | Flange type flow measurement orifice plate device |
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| CN213332946U true CN213332946U (en) | 2021-06-01 |
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| CN202022374946.8U Active CN213332946U (en) | 2020-10-22 | 2020-10-22 | Flange type flow measurement orifice plate device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526387A (en) * | 2022-02-17 | 2022-05-24 | 中海油能源发展装备技术有限公司 | Instrument flange for high-temperature and high-pressure pipeline and manufacturing method |
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2020
- 2020-10-22 CN CN202022374946.8U patent/CN213332946U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526387A (en) * | 2022-02-17 | 2022-05-24 | 中海油能源发展装备技术有限公司 | Instrument flange for high-temperature and high-pressure pipeline and manufacturing method |
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