CN108223959B - Under-pressure plugging device and plugging method for root valve - Google Patents
Under-pressure plugging device and plugging method for root valve Download PDFInfo
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- CN108223959B CN108223959B CN201611153320.6A CN201611153320A CN108223959B CN 108223959 B CN108223959 B CN 108223959B CN 201611153320 A CN201611153320 A CN 201611153320A CN 108223959 B CN108223959 B CN 108223959B
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- polytetrafluoroethylene
- sleeve
- lower flange
- plug
- root valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
Abstract
The invention discloses an under-pressure leakage blocking device and method for a root valve, and belongs to the technical field of non-stop pipeline conveying under-pressure leakage blocking. Wherein the device includes: the lower flange (6) is sleeved at the position where the root valve body (2) is connected with the pressure guiding pipe (3), the sleeve (1) is sleeved outside the root valve body (2), and the lower end of the sleeve (1) is provided with an upper flange (4) along the circumferential direction; the polytetrafluoroethylene plug (5) is positioned between the sleeve (1) and the root valve body (2), and the polytetrafluoroethylene plug (5) is in interference fit with the sleeve (1); and sealing grease coatings are respectively coated between the sleeve (1) and the polytetrafluoroethylene plug (5) and between the polytetrafluoroethylene plug (5) and the outer surface of the root valve body (2). The device simple structure, simple operation can carry out quick shutoff to the leakage of root valve under the condition that the pipeline does not stop to can reach the permanent effect of not having the leakage.
Description
Technical Field
The invention relates to the technical field of pressure plugging of pipelines without stopping transportation, in particular to a pressure plugging device and a plugging method for a root valve.
Background
The root valve is an important valve on various public pipelines and process pipelines, and the bottom of the valve body of the root valve is connected with a main pipeline through a pressure guiding pipe. When the root valve leaks, corresponding measures, such as replacing a new valve, plugging a leaking part and the like, need to be taken in time to prevent the medium in the pipeline from leaking into the surrounding environment. The replacement of a new valve requires a stoppage and a long working time. In order to avoid production stoppage, a method of performing pressure plugging in the operation of a pipeline is mostly adopted to plug a root valve which has leakage.
The existing method for leaking stoppage under pressure mainly comprises a steel belt tensioning method, a low-pressure sticking method, an injection type sealing method and the like.
The steel belt tensioning method comprises the steps of placing a rubber gasket at a leakage point, fixing the rubber gasket by using a steel belt, and stopping leakage by using the rubber gasket. The method is suitable for temporary leakage stoppage of medium and low pressure pipeline leakage, and has high probability of leakage stoppage failure due to the fact that the rubber gasket is easy to age, the steel belt is easy to be influenced by factors such as external force disturbance and the like, and the medium and high pressure pipeline conveying requirements are difficult to meet only through the tensioning effect of the steel belt.
The low-pressure bonding technology is a chemical bonding technology, the method is only suitable for plugging under lower pressure, and the existing various adhesives are not easy to be directly subjected to belt pressure bonding, and a specific flow guide device is needed to realize the belt pressure bonding.
The clamp glue injection method utilizes a sealing cavity formed by the outer surface of the leakage part and the clamp to inject sealing grease into the sealing cavity to fill the sealing cavity, so that the leakage of a medium is prevented, and the leakage is blocked. The method can be used for plugging the leakage of a high-temperature and high-pressure pipeline, but the method needs complex sealing grease injection equipment, has complex operation process and slow plugging speed.
In summary, in the process of implementing the present invention, the inventors found that at least the following problems exist in the prior art: the existing method for leaking stoppage under pressure can not simultaneously meet the requirements of good leaking stoppage effect, short operation time, low cost, simple operation and the like.
Disclosure of Invention
In order to solve the technical problems, the invention provides the under-pressure leakage blocking device and the plugging method for the root valve, which have the advantages of good leakage blocking effect, short operation time, low cost and simplicity in operation.
Specifically, the method comprises the following technical scheme:
in a first aspect, an embodiment of the present invention provides an apparatus for stopping leakage under pressure for a foot valve, including:
the lower flange is sleeved at the position where the root valve body is connected with the pressure guiding pipe, and a through hole matched with the appearance of the position where the root valve body is connected with the pressure guiding pipe is formed in the center of the lower flange;
the sleeve is sleeved outside the root valve body and is in a hollow cylinder shape with a closed upper end and an opened lower end, and an upper flange used for connecting the sleeve and the lower flange is arranged at the lower end of the sleeve along the circumferential direction;
and the number of the first and second groups,
a polytetrafluoroethylene plug located between the sleeve and the root valve body, the polytetrafluoroethylene plug being in interference fit with the sleeve; and sealing grease coatings are respectively coated between the sleeve and the polytetrafluoroethylene plug and between the polytetrafluoroethylene plug and the outer surface of the root valve body.
Furthermore, a plurality of connecting holes are respectively formed in the upper flange and the lower flange, the connecting holes of the upper flange and the connecting holes of the lower flange are correspondingly formed, and the upper flange is connected with the lower flange through a first bolt.
Further, the lower flange comprises a half lower flange a and a half lower flange b; the semi-lower flange a and the semi-lower flange b both comprise semicircular main bodies, connecting lugs are arranged at two ends of the main bodies in the radial direction, connecting holes are formed in the connecting lugs, and second bolts penetrate through the connecting holes in the connecting lugs to connect the semi-lower flange a with the semi-lower flange b; and grooves matched with the shapes of the positions where the root valve body is connected with the pressure guiding pipe are formed in the centers of the half lower flange a and the half lower flange b.
Further, the polytetrafluoroethylene plug comprises a polytetrafluoroethylene half plug a and a polytetrafluoroethylene half plug b; the polytetrafluoroethylene half plug a and the polytetrafluoroethylene half plug b are both semicircular, and grooves matched with the root valve body in shape are formed in the centers of the polytetrafluoroethylene half plug a and the polytetrafluoroethylene half plug b.
Further, still be provided with injecting glue mouth and gas vent on the sleeve, the injecting glue mouth with the gas vent all is connected with the valve.
Further, the roughness of the contact area of the inner surface of the sleeve and the polytetrafluoroethylene plug is below Ra1.6, and the roughness of the inner surface of the polytetrafluoroethylene plug is below Ra1.6; chamfers are machined on the inner surface of the lower end of the sleeve and the edge of the upper surface of the polytetrafluoroethylene.
Further, the sealing grease is a non-curing sealing grease.
In a second aspect, an embodiment of the present invention provides an apparatus for plugging a root valve under pressure, where the apparatus for plugging under pressure according to the first aspect of the embodiment of the present invention is used for implementing the method for plugging under pressure, and the method includes the following steps:
installing the lower flange at the position where the root valve body is connected with a pressure guiding pipe;
coating sealing grease on the outer surface of the root valve body and the outer surface of the polytetrafluoroethylene plug;
sleeving the polytetrafluoroethylene plug on the root valve body;
and sleeving the sleeve on the polytetrafluoroethylene plug, and connecting the upper flange with the lower flange.
Further, after the upper flange and the lower flange are connected, the sleeve is filled with sealing grease.
Further, the method for leaking stoppage under pressure further comprises the following steps: and carrying out surface treatment and anticorrosion treatment on the outer surface of the whole pressurized plugging device.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
in the pressurized leakage plugging device provided by the embodiment of the invention, the leakage point is coated in the sleeve, and double sealing is formed through interference fit between the polytetrafluoroethylene plug and the sleeve and the sealing grease coating. The under-pressure leakage blocking device provided by the embodiment of the invention has the advantages of simple structure, convenience and quickness in operation, no need of fire, capability of quickly blocking the leakage of the root valve under the condition that the pipeline is not in continuous transportation, capability of achieving the effect of no leakage permanently, and capability of meeting the design strength requirement of the pipeline by the compressive strength.
The pressurized plugging device provided by the embodiment of the invention is particularly suitable for pressurized plugging under the condition of not stopping conveying when the valve at the root of the natural gas pipeline valve well slightly leaks, so that the conveying safety of natural gas is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a pressurized plugging device for a foot valve according to an embodiment of the present invention;
FIG. 2 is a schematic view of the assembly of the apparatus for plugging a root valve with pressure according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along A-A of FIG. 2;
FIG. 4 is a schematic structural diagram of a lower flange in the live leakage blocking device for the foot valve according to the embodiment of the present invention;
FIG. 5 is a cross-sectional view taken along D-D of FIG. 4;
FIG. 6 is a schematic structural diagram of a sleeve in the live leakage blocking device for the foot valve according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view taken along line B-B of FIG. 6;
FIG. 8 is a schematic structural diagram of a polytetrafluoroethylene plug in an apparatus for plugging a root valve with pressure according to an embodiment of the present invention;
FIG. 9 is a cross-sectional view taken along the line C-C of FIG. 8;
fig. 10 is an exploded schematic view of a ptfe plug in an apparatus for plugging a root valve with pressure according to an embodiment of the present invention.
The reference numerals in the drawings denote:
1-a sleeve; 11-a glue injection port; 12-an exhaust port;
2-root valve body; 21-a valve stem;
3-a pressure guiding pipe;
4-a first flange;
5-a polytetrafluoroethylene plug; 51-polytetrafluoroethylene half plug a; 52-second polytetrafluoroethylene hemi-plug b;
6-lower flange; 61-half lower flange a; 62-half lower flange b;
7-a first bolt;
8-a valve;
9-second bolt.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings. Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art.
An embodiment of the present invention provides an apparatus for plugging a root valve with pressure, and referring to fig. 1 in combination with fig. 2 and 3, the apparatus for plugging with pressure includes:
the lower flange 6 is sleeved at the position where the root valve body 2 is connected with the pressure guiding pipe 3, and a through hole matched with the shape of the position where the root valve body 2 is connected with the pressure guiding pipe 3 is formed in the center of the lower flange 6.
The sleeve 1 is sleeved outside the root valve body 2, the sleeve 1 is in a hollow cylinder shape with a closed upper end and an opened lower end, and an upper flange 4 used for connecting the sleeve 1 and a lower flange 6 is arranged at the lower end of the sleeve 1 along the circumferential direction.
The polytetrafluoroethylene plug 5 is positioned between the sleeve 1 and the root valve body 2, and the polytetrafluoroethylene plug 5 is in interference fit with the sleeve 1; and sealing grease coatings are respectively coated between the sleeve 1 and the polytetrafluoroethylene plug 5 and between the polytetrafluoroethylene plug 5 and the outer surface of the root valve body 2.
In the pressurized leakage blocking device provided by the embodiment of the invention, the leakage point of the root valve 2 is coated by the sleeve 1. The leaking stoppage device is integrally fixed by an upper flange 4 and a lower flange 6 which are arranged at the lower end of a sleeve 1, wherein the connecting position of a root valve body 2 and a pressure leading pipe 3 is of a reducing boss structure, and the lower flange 6 is fixed by arranging a through hole matched with the reducing boss structure in shape in the center of the lower flange 6 in the embodiment of the invention, so that the leaking stoppage device is prevented from moving upwards due to stress. Set up polytetrafluoroethylene stopper 5 between sleeve 1 and root valve 2, utilize interference fit and sealed fat coating between sleeve 1 and the polytetrafluoroethylene stopper 5 to carry out double sealing to guarantee sealed effect.
When the under-pressure leakage stopping device provided by the embodiment of the invention is used, the lower flange 6 is firstly installed at the position where the root valve body 2 is connected with the pressure guiding pipe 3, then the outer surface of the root valve body 2 and the outer surface of the polytetrafluoroethylene plug 5 are coated with sealing grease, then the polytetrafluoroethylene plug 5 is sleeved on the root valve body 2, finally the sleeve 1 is sleeved on the polytetrafluoroethylene plug 5, and then the upper flange 4 and the lower flange 6 are connected to finish the installation of the under-pressure leakage stopping device, namely finish the stopping of the leakage point of the root valve.
The under-pressure leakage blocking device provided by the embodiment of the invention has the advantages of simple structure, convenience and quickness in operation, no need of fire, capability of quickly blocking the leakage of the root valve under the condition that the pipeline is not in continuous transportation, capability of achieving the effect of no leakage permanently, and capability of meeting the design strength requirement of the pipeline by the compressive strength.
The pressurized plugging device provided by the embodiment of the invention is particularly suitable for pressurized plugging under the condition of not stopping conveying when the valve at the root of the natural gas pipeline valve well slightly leaks, so that the conveying safety of natural gas is ensured.
Those skilled in the art will appreciate that the inner diameter of the sleeve 1 should be greater than the width of the root valve body 2, where the width is the width of the root valve body 2 as a whole, including the width of the stem 21, and the sleeve can cover the valve vertically and centrally. The thickness of the sleeve 1 also needs to meet the design strength requirements of the pipe.
It should be noted that the lower flange 6 only serves as a fixing member, and a problem of sealing of a region where it contacts the root valve needs to be considered.
Further, referring to fig. 3 to 7, in the embodiment of the present invention, a plurality of connection holes are respectively formed in the upper flange 4 and the lower flange 6, the connection holes of the upper flange 4 and the connection holes of the lower flange 6 are correspondingly arranged, and the upper flange 4 and the lower flange 6 are connected by the first bolts 7. The number of the coupling holes of the upper flange 4 and the lower flange 6 may be 8. The diameter of the connection hole depends on the diameter of the first bolt 7, while the minimum diameter of the first bolt 7 should meet the strength and rigidity requirements. The thickness of the upper flange 4 and the lower flange 6 should also meet the strength and rigidity requirements.
Wherein the lower flange 6 comprises a half lower flange a 61 and a half lower flange b 62. Half lower flange a 61 and half lower flange b 62 all include semicircular main part, are provided with the engaging lug at the radial direction's of main part both ends, are provided with the connecting hole on the engaging lug, and second bolt 9 passes the connecting hole on the engaging lug and connects half lower flange a 61 and half lower flange b 62. And the centers of the half lower flange a 61 and the half lower flange b 62 are respectively provided with a groove which is matched with the shape of the position where the root valve body 2 is connected with the pressure guiding pipe 3, and the grooves of the half lower flange a 61 and the half lower flange b 62 are involuted to form a complete through hole which is matched with the shape of the position where the root valve body 2 is connected with the pressure guiding pipe 3.
Further, referring to fig. 8 to 10, in the embodiment of the present invention, the ptfe plug 5 includes a ptfe half plug a 51 and a ptfe half plug b 52. The polytetrafluoroethylene half plug a 51 and the polytetrafluoroethylene half plug b 52 are both semicircular, grooves matched with the shape of the root valve body 2 are formed in the centers of the polytetrafluoroethylene half plug a 51 and the polytetrafluoroethylene half plug b 52, and a complete through hole matched with the shape of the root valve body 2 is formed after the grooves of the polytetrafluoroethylene half plug a 51 and the polytetrafluoroethylene half plug b 52 are combined.
Further, referring to fig. 1, fig. 2 and fig. 6, in the embodiment of the present invention, the sleeve 1 is further provided with a glue injection port 11 and an exhaust port 12, the glue injection port 11 and the exhaust port 12 are both connected with a valve 8 and are provided with a glue injection nozzle, wherein the valve 8 is a high pressure valve. According to the field working condition, when the interference fit of the polytetrafluoroethylene sealing plug 5 and the sealing effect of the sealing grease coating coated on the sealing surface are still not ideal, the sealing can be additionally adopted by adopting a glue injection type sealing, and the specific steps are as follows: the valve at the exhaust port 12 is opened, a high-pressure glue injection gun is connected with the sleeve 1 through a glue injection nozzle, sealing grease is injected into the sleeve 1 from the glue injection port 11, after the sealing grease flows out of the exhaust port 12, the exhaust port 12 is closed, and the sealing grease is continuously injected until the pressure in the sleeve 1 meets the requirement.
In the pressurized leakage plugging device provided by the embodiment of the invention, the sleeve 1 can be obtained by processing a steel pipe, one end of the steel pipe 1 is welded and sealed, and a drift diameter flange is welded on the outer surface of the other end of the steel pipe to be used as an upper flange 4. Before welding the upper flange 4, the inner surface of the open end of the sleeve 1 is subjected to surface treatment and machined by a lathe so that the roughness of the region where the inner surface of the sleeve 1 and the polytetrafluoroethylene plug 5 are in contact is no greater than Ra1.6. Further, a port of the open end of the sleeve 1 is chamfered so that the teflon plug 5 is pressed in.
The processing steps of the polytetrafluoroethylene plug 5 include: firstly, the contact surfaces of the polytetrafluoroethylene half plug a 51 and the polytetrafluoroethylene half plug b 52 are milled flat, the outer circle and the inner circle are machined after butt joint, the smooth and flat surface is ensured, the roughness is below Ra1.6, and the periphery of the upper surface of the polytetrafluoroethylene plug 5 is chamfered so as to be better pressed into the sleeve 1 during installation.
It should be noted that the sealing surfaces of the sleeve 1 and the two ptfe half plugs should not be scratched or scratched to damage the surfaces of the parts, and the lower end (i.e., the open end) of the sleeve 1 should not be burred or flash.
In the embodiment of the invention, the interference magnitude of the polytetrafluoroethylene plug and the sleeve 1 refers to GB/T150 Steel pressure vessel, and the sealing grease is non-solidified sealing grease.
In a second aspect, an embodiment of the present invention provides an under-pressure leak stopping method for a root valve, where the under-pressure leak stopping method is implemented by using the above-mentioned under-pressure leak stopping device, and specifically includes the following steps:
step 101, mounting a lower flange 6 at the position where a root valve body 2 is connected with a pressure guiding pipe 3;
102, coating sealing grease on the outer surface of the root valve body 2 and the outer surface of the polytetrafluoroethylene plug 5;
103, sleeving a polytetrafluoroethylene plug 5 on the root valve body 2;
and 104, sleeving the sleeve 1 on the polytetrafluoroethylene plug 5, and connecting the upper flange 4 with the lower flange 6.
Further, after the upper flange 4 and the lower flange 6 are connected, if the interference fit of the teflon sealing plug 5 and the sealing effect of the sealing grease coating applied to the sealing surface are still not ideal, a glue injection type sealing may be additionally used, that is, the sleeve 1 is filled with the sealing grease. The method comprises the following specific steps: the valve at the exhaust port 12 is opened, a high-pressure glue injection gun is connected with the sleeve 1 through a glue injection nozzle, sealing grease is injected into the sleeve 1 from the glue injection port 11, after the sealing grease flows out of the exhaust port 12, the exhaust port 12 is closed, and the sealing grease is continuously injected until the pressure in the sleeve 1 meets the requirement.
Further, in the method for leaking stoppage under pressure provided by the embodiment of the invention, after all parts are installed and the detected sealing effect reaches the expected effect, the surface treatment and the corrosion prevention treatment can be carried out on the outer surface of the whole body of the device for leaking stoppage under pressure, so that the device for leaking stoppage under pressure can keep a good leaking stoppage effect for a long time. Viscoelastic body and polypropylene cold winding belt can be adopted for external corrosion prevention, and Alocit coating imported from abroad can be adopted for underwater corrosion prevention in a water environment.
In step 104, after the polytetrafluoroethylene plug 5 is sleeved on the root valve body 2, the sleeve 1 is pressed against the polytetrafluoroethylene plug 5 vertically, and then the first bolt 7 is installed to fix the upper flange 4 and the lower flange 6, and the bolts need to be crossed, symmetrical, gradually and uniformly screwed, so that the polytetrafluoroethylene plug 5 is pressed into the sleeve 1 vertically.
Before installing the pressurized plugging device provided by the embodiment of the invention, the sealing surfaces of the sleeve 1, the polytetrafluoroethylene half plug a 51, the polytetrafluoroethylene half plug b 52 and the root valve should be cleaned to ensure the sealing effect.
In practical applications, the top of the root valve is also connected to a pressure pipe, and the root valve is connected to other instruments through the pressure pipe. Under the condition, the instrument can be detached, the pressure guiding valve at the top of the root valve is cut off, and then the pressure leakage stopping device provided by the embodiment of the invention is installed. At this point, the space inside the sleeve 1 should be able to accommodate the foot valve and the remaining pilot tube.
The lower part of the valve is a 1-inch GOV (gas-liquid linkage valve) root valve and the matched specification isThe technical scheme of the embodiment of the invention is further described in detail by taking the pressurized plugging of the pressure guiding pipe (the outer diameter of the pipe is 33.7mm, and the wall thickness of the pipe is 5mm) as an example.
Firstly, cutting the specification into
A Q235 steel pipe 280mm (the outer diameter of the pipeline is 120mm, the wall thickness of the pipeline is 10mm) is used as a sleeve 1, one end of the steel pipe is welded and sealed, a drift diameter flange is welded at the other end of the steel pipe to be used as an upper flange 4, and 8 upper flanges 4 are arranged on the upper flange 4
The thickness of the upper flange 4 is 25 mm. Before welding the upper flange 4, the inner surface of the open end of the steel pipe was subjected to surface treatment with a lathe to a turning depth of 1mm, and the machining process was controlled so that the treated inner diameter was 1mm
mm, and the surface roughness reaches Ra1.6.
The thickness of the lower flange 6 is 30mm, the material is consistent with that of the sleeve 1, and 8 lower flanges are arranged on the lower flange
The hole of (2). According to the structural design of the connection position of the root valve body 2 and the pressure guiding pipe 3, a half lower flange a 6 is designed1 and a half lower flange b 62, and the lower flange 6 is fixed by a reducing boss at the connecting position of the root valve body 2 and the pressure guiding pipe 3, so that the plugging device is prevented from moving upwards due to stress.
Processing a polytetrafluoroethylene plug 5: firstly, milling the contact surfaces of a polytetrafluoroethylene half plug a 51 and a polytetrafluoroethylene half plug b 52, and processing an outer circle and an inner circle after butt joint, wherein the diameter of the inner circle is
mm, outer diameter of
The surface is ensured to be smooth and flat, the roughness reaches Ra1.6, and the circumference of the upper surface of the sleeve is chamfered so as to be better pressed into the sleeve 1 during installation.
Before the pressurized plugging device is used for plugging, whether the sealing surfaces of the sleeve 1 and the two polytetrafluoroethylene half plugs have scratches, scratches and other defects which damage the surfaces of parts or not should be checked. And the sleeve 1, the two polytetrafluoroethylene half plugs and the sealing surface of the root valve are cleaned and cleaned, so that no burr or flash is formed at the open end of the sleeve 1. The lower flange 6 is installed at the position where the root valve body 2 and the pressure guiding pipe 3 are connected, and the second bolt 9 is tightened to fix the half lower flange a 61 and the half lower flange b 62. Uniformly smearing a layer of non-solidified sealant on each sealing surface, then sleeving the polytetrafluoroethylene plug 5 on the surface of the root valve body 2, vertically pressing the sleeve 1 against the polytetrafluoroethylene plug 5, and then installing first bolts 7, wherein the first bolts 7 need to be crossed, symmetrical, gradually and uniformly screwed, so that the polytetrafluoroethylene plug 5 is vertically pressed into the sleeve 1.
In the process, the valve is used for leakage, and the sealing performance of the pressurized leakage plugging device provided by the embodiment of the invention is detected. By performing the air pressure test in a laboratory, the result shows that the pressure is maintained at 10MPa for 96 hours without any change.
In summary, the embodiment of the invention provides the under-pressure leakage blocking device and the leakage blocking method for the root valve, which have the advantages of short operation time, low construction strength and high leakage blocking efficiency, and the device and the method can realize the rapid leakage blocking of the special-shaped structures at the roots of the pipelines with different specifications under the conditions of under-pressure and with-temperature or non-stop transportation, are particularly suitable for the under-pressure leakage blocking under the condition of non-stop transportation when the root valve of the natural gas pipeline valve well slightly leaks, and ensure the transportation safety of natural gas.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. 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 (9)
1. An under-pressure plugging device for a foot valve, comprising:
the lower flange (6) is sleeved at the position where the root valve body (2) is connected with the pressure guiding pipe (3), and a through hole matched with the diameter-variable boss structure at the position where the root valve body (2) is connected with the pressure guiding pipe (3) is formed in the center of the lower flange (6);
the sleeve (1) is sleeved outside the root valve body (2), the sleeve (1) is in a hollow cylinder shape with a closed upper end and an open lower end, and an upper flange (4) used for connecting the sleeve (1) and the lower flange (6) is arranged at the lower end of the sleeve (1) along the circumferential direction;
and the number of the first and second groups,
a polytetrafluoroethylene plug (5) located between the sleeve (1) and the root valve body (2), the polytetrafluoroethylene plug (5) being in interference fit with the sleeve (1); sealing grease coatings are coated between the sleeve (1) and the polytetrafluoroethylene plug (5) and between the polytetrafluoroethylene plug (5) and the outer surface of the root valve body (2);
the lower flange (6) comprises a half lower flange a (61) and a half lower flange b (62); the half lower flange a (61) and the half lower flange b (62) respectively comprise a semicircular main body, two ends of the main body in the radial direction are provided with connecting lugs, connecting holes are formed in the connecting lugs, and a second bolt (9) penetrates through the connecting holes in the connecting lugs to connect the half lower flange a (61) and the half lower flange b (62); and grooves matched with the shapes of the positions where the root valve body (2) is connected with the pressure guiding pipe (3) are formed in the centers of the half lower flange a (61) and the half lower flange b (62).
2. The belt pressure leakage blocking device according to claim 1, wherein a plurality of connecting holes are respectively formed in the upper flange (4) and the lower flange (6), the connecting holes of the upper flange (4) and the connecting holes of the lower flange (6) are correspondingly arranged, and the upper flange (4) and the lower flange (6) are connected through first bolts (7).
3. An apparatus for lost circulation under pressure according to claim 1, characterized in that the polytetrafluoroethylene plug (5) comprises a polytetrafluoroethylene half plug a (51) and a polytetrafluoroethylene half plug b (52); the polytetrafluoroethylene half plug a (51) and the polytetrafluoroethylene half plug b (52) are both semicircular, and a groove matched with the root valve body (2) in shape is formed in the centers of the polytetrafluoroethylene half plug a (51) and the polytetrafluoroethylene half plug b (52).
4. The pressurized leakage blocking device according to claim 1, characterized in that the sleeve (1) is further provided with a glue injection port (11) and an exhaust port (12), and the glue injection port (11) and the exhaust port (12) are both connected with a valve (8).
5. The lost circulation device with pressure according to claim 1, characterized in that the roughness of the contact area of the inner surface of the sleeve (1) and the polytetrafluoroethylene plug (5) is below Ra1.6, and the roughness of the inner surface of the polytetrafluoroethylene plug (5) is below Ra1.6; chamfers are machined on the inner surface of the lower end of the sleeve (1) and the edge of the upper surface of the polytetrafluoroethylene (5).
6. The lost circulation device with pressure of claim 1, wherein the sealing grease is a non-curing sealing grease.
7. An under-pressure leakage blocking method for a root valve, which is implemented by using the under-pressure leakage blocking device as claimed in any one of claims 1 to 6, and comprises the following steps:
installing the half lower flange a (61) and the half lower flange b (62) at the position where the root valve body (2) is connected with the pressure guiding pipe (3);
coating sealing grease on the outer surface of the root valve body (2) and the outer surface of the polytetrafluoroethylene plug (5);
sleeving the polytetrafluoroethylene plug (5) on the root valve body (2);
and sleeving the sleeve (1) on the polytetrafluoroethylene plug (5), and connecting the upper flange (4) with the lower flange (6).
8. Method for leak stoppage with pressure according to claim 7, characterized in that the sleeve (1) is filled with a sealing grease after the connection of the upper flange (4) and the lower flange (6).
9. The method of claim 7 or 8, further comprising: and carrying out surface treatment and anticorrosion treatment on the outer surface of the whole pressurized plugging device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611153320.6A CN108223959B (en) | 2016-12-14 | 2016-12-14 | Under-pressure plugging device and plugging method for root valve |
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| CN201611153320.6A CN108223959B (en) | 2016-12-14 | 2016-12-14 | Under-pressure plugging device and plugging method for root valve |
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| CN108223959A CN108223959A (en) | 2018-06-29 |
| CN108223959B true CN108223959B (en) | 2020-01-03 |
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| CN113752447B (en) * | 2020-06-03 | 2023-03-21 | 中国石油化工股份有限公司 | Device and method for online leak stoppage of valve |
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| US3467141A (en) * | 1967-01-09 | 1969-09-16 | Joseph B Smith | Flange coupling repair ring |
| CN201561143U (en) * | 2009-04-16 | 2010-08-25 | 江苏苏阀高压阀门有限公司 | Sealing pair structure of flat gate valve |
| CN202580461U (en) * | 2012-06-08 | 2012-12-05 | 安徽皖维高新材料股份有限公司 | Pressure sealing structure for high-pressure fluid pipeline |
| CN202884373U (en) * | 2012-10-26 | 2013-04-17 | 中国石油天然气股份有限公司长庆石化分公司 | Inflammable gas valve on-line leaking stoppage box |
| CN103615626B (en) * | 2013-12-04 | 2015-08-26 | 刘明生 | The leak stoppage device of the low row of petrochemical equipment |
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Address after: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Patentee after: PETROCHINA Co.,Ltd. Patentee after: National Pipe Network Group Beijing Pipeline Co.,Ltd. Address before: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Patentee before: PETROCHINA Co.,Ltd. Patentee before: PETROCHINA BEIJING GAS PIPELINE CO.,LTD. |
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Effective date of registration: 20211227 Address after: Room 08-10, 6 / F, block a, No. 5, Dongtucheng Road, Chaoyang District, Beijing 100013 Patentee after: National Petroleum and natural gas pipeline network Group Co.,Ltd. Patentee after: National Pipe Network Group Beijing Pipeline Co.,Ltd. Address before: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Patentee before: PETROCHINA Co.,Ltd. Patentee before: National Pipe Network Group Beijing Pipeline Co.,Ltd. |
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