CN116498760B - Flat valve with combined double-valve-seat precise sealing structure and working method - Google Patents
Flat valve with combined double-valve-seat precise sealing structure and working method Download PDFInfo
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- CN116498760B CN116498760B CN202310755341.9A CN202310755341A CN116498760B CN 116498760 B CN116498760 B CN 116498760B CN 202310755341 A CN202310755341 A CN 202310755341A CN 116498760 B CN116498760 B CN 116498760B
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- 238000007789 sealing Methods 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000012530 fluid Substances 0.000 claims abstract description 52
- 238000003825 pressing Methods 0.000 claims description 31
- 239000004576 sand Substances 0.000 claims description 12
- 230000002265 prevention Effects 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000000149 penetrating effect Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 235000004507 Abies alba Nutrition 0.000 description 1
- 241000191291 Abies alba Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/0227—Packings
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/04—Construction of housing; Use of materials therefor of sliding valves
- F16K27/044—Construction of housing; Use of materials therefor of sliding valves slide valves with flat obturating members
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/08—Guiding yokes for spindles; Means for closing housings; Dust caps, e.g. for tyre valves
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/60—Handles
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sliding Valves (AREA)
Abstract
The invention discloses a flat valve with a combined double-valve-seat precise sealing structure and a working method, and relates to the technical field of flat valve sealing structures; a second central hole communicated with the sinking groove is formed in the inner valve seat, and a second sealing ring positioned at the outer side of the baffle ring is sleeved on the inner valve seat; a valve plate capable of moving up and down is slidably arranged between the inner valve seats of the two combined double-valve-seat precise sealing structures, and a through hole for communicating an inlet end with an outlet end is formed in the valve plate. The beneficial effects of the invention are as follows: the leakage of fluid into the valve cavity is prevented, and the sealing precision is high.
Description
Technical Field
The invention relates to the technical field of flat valve sealing structures, in particular to a flat valve with a combined double-valve-seat precise sealing structure and a working method thereof.
Background
In the development process of oil and gas fields, the plate valve is an important component of an oil and gas production system, and is also a key unit device for controlling oil and gas switching in wellhead devices, christmas trees and manifold systems, and a valve plate in the plate valve can conduct or cut off fluid, namely, when the valve plate is opened, the fluid flows into a next pipeline, and when the valve plate is closed, the fluid flows into the next pipeline.
The structure of a flat valve used in a petroleum exploitation area is shown in fig. 1-2, the flat valve comprises a valve body 1, a valve cavity 2 penetrating through the top surface and the bottom surface of the valve body 1 is formed in the valve body 1, an outlet end 3 communicated with the valve body 1 is formed in the left side wall of the valve body 1, an inlet end 4 communicated with the valve cavity 2 is formed in the right side wall of the valve body 1, counter bores 5 are formed in the contact position of the inlet end 4 and the inner wall of the valve cavity 2 and the contact position of the outlet end 3 and the inner wall of the valve cavity 2, a valve seat 33 is embedded in the counter bores 5, the valve seat 33 extends in the valve cavity 2, a sand prevention plate 9 is fixedly arranged on the cylindrical surface of the extending end, the inner end surface of the sand prevention plate 9 is flush with the end surface in the valve seat 33, a sealing ring 34 is arranged between the outer end surface of the valve seat 33 and the step surface of the counter bore 5, a central hole 35 communicated with the counter bore 5 is formed in the valve seat 33, a valve plate 23 which can move up and down is slidably arranged between the two valve seats 33, and through holes 31 communicated with the inlet end 4 and the outlet end 3 are formed in the valve plate 23;
the top and the bottom of valve pocket 2 have set firmly upper valve gap 24 and lower valve gap 25 respectively, pass through bearing rotation installation adapter 26 in the upper valve gap 24, adapter 26 extends in the outside of upper valve gap 24, set firmly nut 27 in the adapter 26, nut 27 female screw connection has the lead screw 28 that is located in adapter 26, the bottom of lead screw 28 has set firmly upper valve rod 29, the lower tip of upper valve rod 29 extends in valve pocket 2, and extension end rotation installation is in the top of valve plate 23, the bottom of valve plate 23 has set firmly lower valve rod 30, lower valve rod 30 slidable mounting is in lower valve gap 25.
The working method of the flat valve is as follows: fluid flows into the next pipeline from the inlet end 4 through the counter bore 5 on the right side, the central hole 35 of the valve seat 33 on the right side, the through hole 31 of the valve plate 23, the central hole 35 of the valve seat 33 on the left side and the counter bore 5 on the left side in sequence, and finally flows into the next pipeline through the outlet end 3, wherein the flowing direction of the fluid is shown by an arrow in fig. 1; when the fluid is to be cut off, a worker rotates the handle at the top of the adapter 26 forward, the handle drives the adapter 26 to rotate forward, the adapter 26 drives the nut 27 to rotate synchronously, the screw rod 28 drives the upper valve rod 29 to move downwards under the cooperation of the nut 27 and the screw rod 28, the upper valve rod 29 drives the valve plate 23 to move downwards along the area surrounded by the two valve seats 33, and when the through hole 31 of the valve plate 23 is misplaced with the central hole 35 of the valve seat 33, the fluid can be cut off as shown in fig. 3.
However, such a flat valve, although capable of being used in the oil extraction area, still presents the following technical drawbacks after a long period of use:
I. after the fluid enters a gap between the right end surface of the valve seat 33 and the step surface of the counter bore 5, the fluid continuously impacts the sealing ring 34, so that a gap A appears between the right end surface of the sealing ring 34 and the step surface of the counter bore 5, the fluid sequentially passes through the gap A, the gap between the counter bore 5 and the outer wall of the valve seat 33, and finally enters the valve cavity 2 of the valve body 1, and the fluid is not allowed to enter the valve cavity 2 in practice, so that the flat valve has the technical defect of inaccurate sealing; to solve this problem, the flat valve can be frequently disassembled to replace the packing 34, but the operation is troublesome.
II. Along with the reciprocating up-and-down movement of the valve plate 23 between the two valve seats 33, the inner end surfaces of the valve seats 33 are severely worn, so that a gap B appears between the valve plate 23 and the inner end surfaces of the valve seats 33, and fluid enters the valve cavity 2 of the valve body 1 through the gap B, so that the flat valve has the technical defect of inaccurate sealing; to solve this problem, the flat valve can only be frequently disassembled to replace the valve seat 33. Therefore, a flat valve with a combined double-valve-seat precise sealing structure and a working method thereof, which can prevent fluid from leaking into a valve cavity, and have high sealing precision, are needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a flat valve with a combined double-valve seat precise sealing structure and a working method, wherein the flat valve has the advantages of compact structure, fluid leakage prevention into a valve cavity and high sealing precision.
The aim of the invention is achieved by the following technical scheme: a flat valve with combined double-valve-seat precise sealing structure comprises a valve body, wherein a valve cavity penetrating through the top bottom surface of the valve body is formed in the valve body, an outlet end communicated with the valve cavity is formed in the left side wall of the valve body, an inlet end communicated with the valve cavity is formed in the right side wall of the valve body, counter bores are formed in the contact position of the inlet end and the inner wall of the valve cavity and the contact position of the outlet end and the inner wall of the valve cavity, combined double-valve-seat precise sealing structures are arranged in the two counter bores, the combined double-valve-seat precise sealing structures on the right side comprise an outer valve seat, an inner valve seat, a sand prevention plate, a pressing ring and an annular seat, the right end part of the outer valve seat is embedded in the counter bores, a first sealing ring is arranged between the right end surface of the outer valve seat and the step surface of the counter bore, a first center hole communicated with the counter bore is formed in the outer valve seat, the left end part of the outer valve seat extends in the valve cavity, a countersink communicated with the first center hole is formed in the end surface of the extending end, the annular seat is welded on the outer end surface of the outer valve seat, a sealed annular cavity is formed in the annular cavity, an annular slider is matched with the annular cavity in an inner sliding manner in the annular seat along the radial direction, the right end face of the annular slider is embedded in the right end face along the circumferential direction, a plurality of guide posts penetrating through the annular guide posts along the radial direction, and the radial direction along the corresponding radial direction to the inner channel L is formed in the annular channel L, and the annular channel is formed along the radial direction;
the right end part of the inner valve seat is embedded in the sinking groove, a second central hole communicated with the sinking groove is formed in the inner valve seat, a baffle ring is fixedly arranged on the outer cylindrical surface of the right end part of the inner valve seat, a second sealing ring positioned on the outer side of the baffle ring is sleeved on the inner valve seat, a pressing ring is sleeved on the inner valve seat and positioned on the right side of the second sealing ring, the left end part of the inner valve seat extends out of the sinking groove, a sand control plate is fixedly arranged on the cylindrical surface of the extending end, and the right end surface of the sand control plate is level with the left end surface of the inner valve seat;
a valve plate capable of moving up and down is slidably arranged between the inner valve seats of the two combined double-valve-seat precise sealing structures, and a through hole for communicating an inlet end with an outlet end is formed in the valve plate.
The flat valve further comprises an upper valve cover and a lower valve cover which are respectively fixedly arranged at the top and the bottom of the valve cavity, the adapter is rotatably arranged in the upper valve cover through a bearing, the adapter extends outside the upper valve cover, a nut is fixedly arranged in the adapter, a screw rod positioned in the adapter is connected with the nut in an internal thread manner, an upper valve rod is fixedly arranged at the bottom of the screw rod, the lower end part of the upper valve rod extends in the valve cavity, the extending end is rotatably arranged at the top end part of the valve plate, a lower valve rod is fixedly arranged at the bottom of the valve plate, and the lower valve rod is slidably arranged in the lower valve cover.
The guide posts are uniformly distributed on the annular sliding block, and a movable sealing piece is arranged at the contact position between the guide posts and the annular seat.
The outer wall of the pressing ring is in sliding fit with the inner wall of the sinking groove, and the pressing ring is in sliding fit with the outer wall of the inner valve seat.
The right side wall of the valve cavity is provided with a plurality of threaded holes which respectively correspond to the guide posts, the guide posts are provided with external threads, and the guide posts are fixedly arranged on the right side wall of the valve cavity through the threaded connection of the external threads and the threaded holes.
The baffle ring and the inner valve seat are integrally formed.
The two combined double-valve-seat precise sealing structures are symmetrically arranged on the left side and the right side of the valve plate.
The diameter of the first central hole is equal to that of the second central hole, and the inner valve seat, the baffle ring, the second sealing ring, the pressing ring, the outer valve seat, the annular seat and the first sealing ring are coaxially arranged.
A working method of a flat valve with a combined double-valve seat precise sealing structure comprises the following steps:
s1, fluid conveyed from a wellhead sequentially passes through an inlet end, a counter bore of a combined double-valve-seat precise sealing structure on the right side, a first central hole of an outer valve seat, a counter sink, a second central hole of an inner valve seat, a through hole of a valve plate, a second central hole of an inner valve seat of the combined double-valve-seat precise sealing structure on the left side, the first central hole of the outer valve seat and the counter bore, and finally flows into a next pipeline through an outlet end to realize the conduction of the fluid;
when fluid flows through the sink groove, a part of fluid sequentially passes through a region defined between the right end face of the inner valve seat and the bottom of the sink groove, one port of the L-shaped flow passage and the other port of the L-shaped flow passage, and finally enters the closed annular cavity of the annular seat to fill the closed annular cavity, and at the moment, the fluid in the closed annular cavity applies pressure to the right side wall of the annular seat, so that the annular seat has a rightward movement trend, and the outer valve seat has a rightward movement trend, so that the outer end face of the outer valve seat compresses the first sealing ring; meanwhile, fluid in a region surrounded by the right end face of the inner valve seat and the bottom of the sinking groove applies pressure to the pressing ring and the right end face of the inner valve seat, so that the left end face of the inner valve seat is abutted against the right end face of the valve plate, and the pressing ring presses the second sealing ring between the baffle ring and the pressing ring;
s2, when a worker wants to cut off the fluid, the operation method for cutting off the fluid is as follows: the handle at the top of the adapter is rotated forward by a worker, the adapter drives the adapter to rotate forward, the adapter drives the nut to rotate synchronously, under the cooperation of the nut and the screw rod, the screw rod drives the upper valve rod to move downwards, the upper valve rod drives the valve plate to move downwards along the area surrounded by the inner valve seats of the two combined double-valve-seat precise sealing structures, and when the through holes of the valve plate are staggered with the first central holes of the outer valve seats, fluid can be cut off.
The invention has the following advantages: the structure is compact, the fluid is prevented from leaking into the valve cavity, and the sealing precision is high.
Drawings
FIG. 1 is a schematic view of a plate valve used in an oil exploitation area;
FIG. 2 is an enlarged partial view of section I of FIG. 1;
FIG. 3 is a schematic illustration of a valve plate cutting off fluid;
FIG. 4 is a schematic diagram of the invention in full section;
FIG. 5 is a schematic representation of the present invention in semi-section;
FIG. 6 is an enlarged partial view of section II of FIG. 5;
FIG. 7 is an enlarged partial view of section III of FIG. 6;
FIG. 8 is a schematic structural view of an outer valve seat;
FIG. 9 is a schematic view in section A-A of FIG. 8;
FIG. 10 is a schematic view of the structure of the annular seat;
FIG. 11 is a schematic cross-sectional view of FIG. 10;
FIG. 12 is a schematic view of the connection of the annular slider and the guide bar
FIG. 13 is a schematic illustration of the connection of the inner valve seat, the clamping ring and the second seal ring;
FIG. 14 is a schematic view of the structure of the press ring;
in the figure:
1-valve body, 2-valve cavity, 3-outlet end, 4-inlet end, 5-counter bore, 6-combined double valve seat precision sealing structure, 7-outer valve seat, 8-inner valve seat, 9-sand control plate, 10-pressing ring, 11-annular seat, 12-first sealing ring, 13-first central hole, 14-counter sink, 15-closed annular cavity, 16-annular slide block, 17-guiding column, 18-radial hole, 19-L-shaped runner, 20-second central hole, 21-baffle ring, 22-second sealing ring and 23-valve plate;
24-upper valve cover, 25-lower valve cover, 26-adapter, 27-nut, 28-lead screw, 29-upper valve rod, 30-lower valve rod, 31-through hole, 32-dynamic seal piece, 33-valve seat, 34-sealing ring and 35-central hole.
Detailed Description
The invention is further described below with reference to the accompanying drawings, the scope of the invention not being limited to the following:
as shown in fig. 4-14, a flat valve with a combined double-valve-seat precise sealing structure comprises a valve body 1, wherein a valve cavity 2 penetrating through the top surface and the bottom surface of the valve body 1 is formed in the valve body 1, an outlet end 3 communicated with the valve body 1 is formed in the left side wall of the valve body 1, an inlet end 4 communicated with the valve cavity 2 is formed in the right side wall of the valve body 1, counter bores 5 are formed in the contact part of the inlet end 4 and the inner wall of the valve cavity 2 and the contact part of the outlet end 3 and the inner wall of the valve cavity 2, combined double-valve-seat precise sealing structures 6 are arranged at the two counter bores 5, and the two combined double-valve-seat precise sealing structures 6 are symmetrically arranged left and right relative to a valve plate 23.
The combined double-valve-seat precise sealing structure 6 positioned on the right side comprises an outer valve seat 7, an inner valve seat 8, a sand control plate 9, a pressing ring 10 and an annular seat 11, wherein the right end part of the outer valve seat 7 is embedded in a counter bore 5, a first sealing ring 12 is arranged between the right end surface of the outer valve seat 7 and the step surface of the counter bore 5, a first central hole 13 communicated with the counter bore 5 is formed in the outer valve seat 7, the left end part of the outer valve seat 7 extends in a valve cavity 2, a countersink 14 communicated with the first central hole 13 is formed in the end surface of the extending end, the annular seat 11 is welded on the outer end surface of the outer valve seat 7, a closed annular cavity 15 is formed in the annular seat 11, an annular slide 16 is in sliding fit in the closed annular cavity 15, a plurality of guide columns 17 are welded on the right end surface of the annular slide 16 along the circumferential direction of the annular slide 17, the guide columns 17 penetrate through the annular seat 11 and are fixedly arranged on the right side wall of the valve cavity 2, the guide columns 17 are uniformly distributed on the annular slide 16, a contact part between the guide columns 17 and the annular seat 11 is provided with a sealing piece 32, a plurality of radial through holes 19 are formed in the inner wall of the annular seat 11 along the circumferential direction of the countersink surface, a plurality of radial through holes 19 are formed in the radial direction along the radial direction of the inner wall of the countersink hole 18, and the annular seat 11 corresponds to the radial channel 19, and the radial through hole 18 is formed in the radial channel 18L and the other end opening is formed in the radial channel 18.
The right end part of the inner valve seat 8 is embedded in the sinking groove 14, a second central hole 20 communicated with the sinking groove 14 is formed in the inner valve seat 8, a baffle ring 21 is fixedly arranged on the outer cylindrical surface of the right end part of the inner valve seat 8, the baffle ring 21 and the inner valve seat 8 are integrally formed, a second sealing ring 22 positioned on the outer side of the baffle ring 21 is sleeved on the inner valve seat 8, a pressing ring 10 is sleeved on the inner valve seat 8 and positioned on the right side of the second sealing ring 22, the outer wall of the pressing ring 10 is in sliding fit with the inner wall of the sinking groove 14, the pressing ring 10 is in sliding fit with the outer wall of the inner valve seat 8, the left end part of the inner valve seat 8 extends out of the sinking groove 14, a sand prevention plate 9 is fixedly arranged on the cylindrical surface of the extending end, and the right end surface of the sand prevention plate 9 is flush with the left end surface of the inner valve seat 8; a valve plate 23 capable of moving up and down is slidably arranged between the inner valve seats 8 of the two combined double-valve-seat precise sealing structures 6, and a through hole 31 for communicating the inlet end 4 with the outlet end 3 is formed in the valve plate 23.
The flat valve further comprises an upper valve cover 24 and a lower valve cover 25 which are respectively fixedly arranged at the top and the bottom of the valve cavity 2, an adapter 26 is rotatably arranged in the upper valve cover 24 through a bearing, the adapter 26 extends outside the upper valve cover 24, a nut 27 is fixedly arranged in the adapter 26, a screw rod 28 positioned in the adapter 26 is connected with the nut 27 in an internal thread manner, an upper valve rod 29 is fixedly arranged at the bottom of the screw rod 28, the lower end part of the upper valve rod 29 extends in the valve cavity 2, the extending end is rotatably arranged at the top end part of the valve plate 23, a lower valve rod 30 is fixedly arranged at the bottom of the valve plate 23, and the lower valve rod 30 is slidably arranged in the lower valve cover 25.
The right side wall of the valve cavity 2 is provided with a plurality of threaded holes which respectively correspond to the guide posts 17, the guide posts 17 are provided with external threads, and the guide posts 17 are fixedly connected with the right side wall of the valve cavity 2 through the external threads and the threaded holes. The diameter of the first central hole 13 is equal to that of the second central hole 20, and the inner valve seat 8, the baffle ring 21, the second sealing ring 22, the pressing ring 10, the outer valve seat 7, the annular seat 11 and the first sealing ring 12 are coaxially arranged.
A working method of a flat valve with a combined double-valve seat precise sealing structure comprises the following steps:
s1, fluid conveyed from a wellhead sequentially flows into a next pipeline through an inlet end 4, a counter bore 5 of a right combined double-valve-seat precise sealing structure 6, a first central hole 13 of an outer valve seat 7, a counter sink 14, a second central hole 20 of an inner valve seat 8, a through hole 31 of a valve plate 23, a second central hole 20 of the inner valve seat 8 of the left combined double-valve-seat precise sealing structure 6, a first central hole 13 of the outer valve seat 7 and the counter bore 5, and finally flows into the next pipeline through an outlet end 3 so as to realize the conduction of the fluid;
when the fluid flows through the sink groove 14, a part of the fluid sequentially passes through a region defined between the right end surface of the inner valve seat 8 and the bottom of the sink groove 14, one port of the L-shaped flow channel 19, and the other port of the L-shaped flow channel 19, and finally enters the closed annular cavity 15 of the annular seat 11 to fill the closed annular cavity 15, and at this time, the fluid in the closed annular cavity 15 applies pressure to the right side wall of the annular seat 11, wherein the pressure direction is shown by an arrow in fig. 7, so that the annular seat 11 has a rightward movement trend, and the outer valve seat 7 has a rightward movement trend, so that the outer end surface of the outer valve seat 7 compresses the first sealing ring 12; meanwhile, fluid in a region enclosed between the right end surface of the inner valve seat 8 and the bottom of the sinking groove 14 applies pressure to the pressing ring 10 and the right end surface of the inner valve seat 8, so that the left end surface of the inner valve seat 8 is abutted against the right end surface of the valve plate 23, and the pressing ring 10 presses the second sealing ring 22 between the baffle ring 21 and the pressing ring 10;
s2, when a worker wants to cut off the fluid, the operation method for cutting off the fluid is as follows: the handle at the top of the adapter 26 is rotated forward by a worker, the adapter 26 is driven to rotate forward by the handle, the nut 27 is driven to rotate synchronously by the adapter 26, the upper valve rod 29 is driven to move downwards by the screw rod 28 under the cooperation of the nut 27 and the screw rod 28, the valve plate 23 is driven to move downwards along the area surrounded by the inner valve seats 8 of the two combined double-valve-seat precise sealing structures 6 by the upper valve rod 29, and when the through holes 31 of the valve plate 23 are staggered with the first central holes 13 of the outer valve seats 7, fluid can be cut off.
From this step S1, it is known that, since a part of fluid sequentially passes through the area enclosed between the right end surface of the inner valve seat 8 and the bottom of the sink groove 14, one port of the L-shaped flow channel 19, and the other port of the L-shaped flow channel 19, and finally enters the closed annular cavity 15 of the annular seat 11, both the annular seat 11 and the outer valve seat 7 have a tendency to move rightward, so that the outer end surface of the outer valve seat 7 always compresses the first sealing ring 12, so when a gap a appears between the right end surface of the first sealing ring 12 and the step surface of the counter bore 5, the right end surface of the outer valve seat 7 compresses the first sealing ring 12 under the pressure of the fluid in the closed annular cavity 15, so as to compensate the gap a appearing, thereby avoiding the fluid leaking into the valve cavity 2 through the gap a.
In addition, because the fluid in the area enclosed between the right end surface of the inner valve seat 8 and the bottom of the sink groove 14 always applies pressure to the pressing ring 10 and the right end surface of the inner valve seat 8, so that the left end surface of the inner valve seat 8 leans against the right end surface of the valve plate 23, when a gap B appears between the valve plate 23 and the left end surface of the inner valve seat 8, the left end surface of the inner valve seat 8 always leans against the right end surface of the valve plate 23 under the action of the fluid to compensate the gap B, so that the leakage of the fluid into the valve cavity 2 through the gap B is avoided, and compared with the flat valve shown in fig. 1-3, the flat valve further improves the sealing precision and has the characteristic of high sealing precision.
Meanwhile, since the pressing ring 10 always presses the second sealing ring 22 between the baffle ring 21 and the pressing ring 10, when a gap C appears between the second sealing ring 22 and the inner wall of the sinking groove 14, the pressing direction is shown by an arrow in fig. 13 when the fluid presses the right end face of the pressing ring 10, so that the pressing ring 10 always presses the second sealing ring 22 on the baffle ring 21 to supplement the gap C, thereby avoiding the leakage of the fluid into the valve cavity 2 through the gap C.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a flat valve with two disk seat precision seal structures of combination, it includes valve body (1), offer in valve body (1) and run through valve pocket (2) of its top and bottom surface, offered on the left side wall of valve body (1) and linked the exit end (3) of valve body (1), offered on the right side wall of valve body (1) and linked the entrance end (4) of valve pocket (2), entrance end (4) and valve pocket (2) inner wall's contact department, exit end (3) and valve pocket (2) inner wall's contact department all offered counter bore (5), its characterized in that:
the combined double-valve-seat precise sealing structure (6) is arranged at the positions of the two counter bores (5), the combined double-valve-seat precise sealing structure (6) positioned on the right side comprises an outer valve seat (7), an inner valve seat (8), a sand prevention plate (9), a pressing ring (10) and an annular seat (11), the right end part of the outer valve seat (7) is embedded in the counter bores (5), a first sealing ring (12) is arranged between the right end surface of the outer valve seat (7) and the step surface of the counter bores (5), a first center hole (13) communicated with the counter bores (5) is formed in the outer valve seat (7), the left end part of the outer valve seat (7) extends into the valve cavity (2), a countersink (14) communicated with the first center hole (13) is formed in the end surface of the extending end, the annular seat (11) is welded on the outer end surface of the outer valve seat (7), a closed annular cavity (15) is formed in the annular seat (11), a plurality of guide posts (17) are arranged on the right end surface of the annular slider (16) in a sliding fit mode, a plurality of guide posts (17) are arranged on the right end surface of the annular slider (16) along the circumferential direction, a plurality of guide posts (17) are fixedly arranged on the inner wall of the annular seat (11), and the annular seat (11) is fixedly arranged on the circumference of the inner wall of the annular seat (11) along the circumference direction of the guide posts (17), a plurality of L-shaped flow passages (19) which respectively correspond to the radial holes (18) are formed in the outer valve seat (7) along the circumferential direction of the outer valve seat, one port of each L-shaped flow passage (19) penetrates through the bottom of the corresponding sink groove (14), and the other port of each L-shaped flow passage is communicated with the radial holes (18);
the right end part of the inner valve seat (8) is embedded in the sinking groove (14), a second center hole (20) communicated with the sinking groove (14) is formed in the inner valve seat (8), a baffle ring (21) is fixedly arranged on the outer cylindrical surface of the right end part of the inner valve seat (8), a second sealing ring (22) positioned on the outer side of the baffle ring (21) is sleeved on the inner valve seat (8), a pressing ring (10) is sleeved on the inner valve seat (8) and positioned on the right side of the second sealing ring (22), the left end part of the inner valve seat (8) extends out of the sinking groove (14), a sand prevention plate (9) is fixedly arranged on the cylindrical surface of the extending end, and the right end surface of the sand prevention plate (9) is flush with the left end surface of the outer valve seat (7);
a valve plate (23) capable of moving up and down is slidably arranged between the inner valve seats (8) of the two combined double valve seat precision sealing structures (6), and a through hole (31) for communicating the inlet end (4) and the outlet end (3) is formed in the valve plate (23).
2. A flat valve having a combined double-valve seat precision sealing structure according to claim 1, wherein: the flat valve further comprises an upper valve cover (24) and a lower valve cover (25) which are respectively fixedly arranged at the top and the bottom of the valve cavity (2), an adapter (26) is rotatably arranged in the upper valve cover (24) through a bearing, the adapter (26) extends outside the upper valve cover (24), a nut (27) is fixedly arranged in the adapter (26), a screw rod (28) positioned in the adapter (26) is connected with the inner thread of the nut (27), an upper valve rod (29) is fixedly arranged at the bottom of the screw rod (28), the lower end part of the upper valve rod (29) extends in the valve cavity (2), the extending end is rotatably arranged at the top end part of the valve plate (23), a lower valve rod (30) is fixedly arranged at the bottom of the valve plate (23), and the lower valve rod (30) is slidably arranged in the lower valve cover (25).
3. A flat valve having a combined double-valve seat precision sealing structure according to claim 2, wherein: the guide posts (17) are uniformly distributed on the annular sliding block (16), and a movable sealing piece (32) is arranged at the contact position between the guide posts (17) and the annular seat (11).
4. A flat valve having a combined double-valve seat precision sealing structure according to claim 3, wherein: the outer wall of the pressing ring (10) is in sliding fit with the inner wall of the sinking groove (14), and the pressing ring (10) is in sliding fit with the outer wall of the inner valve seat (8).
5. A flat valve having a combined double-seat precision sealing structure according to claim 4, wherein: the right side wall of the valve cavity (2) is provided with a plurality of threaded holes which respectively correspond to the guide posts (17), the guide posts (17) are provided with external threads, and the guide posts (17) are fixedly arranged on the right side wall of the valve cavity (2) through the threaded connection of the external threads and the threaded holes.
6. A flat valve having a combined double-seat precision sealing structure according to claim 5, wherein: the baffle ring (21) and the inner valve seat (8) are integrally formed.
7. A flat valve having a combined double-valve seat precision sealing structure according to claim 6, wherein: the two combined double-valve-seat precise sealing structures (6) are symmetrically arranged on the left and right sides of the valve plate (23).
8. A flat valve having a combined double-seat precision sealing structure according to claim 7, wherein: the diameter of the first central hole (13) is equal to that of the second central hole (20), and the inner valve seat (8), the baffle ring (21), the second sealing ring (22), the pressing ring (10), the outer valve seat (7), the annular seat (11) and the first sealing ring (12) are coaxially arranged.
9. A working method of a flat valve with a combined double-valve-seat precise sealing structure, which adopts the flat valve with the combined double-valve-seat precise sealing structure as claimed in claim 8, and is characterized in that: it comprises the following steps:
s1, fluid conveyed from a wellhead sequentially passes through an inlet end (4), a counter bore (5) of a combined double-valve-seat precise sealing structure (6) on the right side, a first central hole (13) of an outer valve seat (7), a counter sink (14), a second central hole (20) of an inner valve seat (8), a through hole (31) of a valve plate (23), a second central hole (20) of the inner valve seat (8) of the combined double-valve-seat precise sealing structure (6) on the left side, the first central hole (13) of the outer valve seat (7) and the counter bore (5), and finally flows into the next pipeline through an outlet end (3) to realize fluid conduction;
when fluid flows through the sink groove (14), a part of fluid sequentially passes through a region defined between the right end face of the inner valve seat (8) and the bottom of the sink groove (14), one port of the L-shaped flow passage (19), the L-shaped flow passage (19) and the other port of the L-shaped flow passage (19), and finally enters the closed annular cavity (15) of the annular seat (11) to fill the closed annular cavity (15), and at the moment, the fluid in the closed annular cavity (15) applies pressure to the right side wall of the annular seat (11), so that the annular seat (11) has a rightward movement trend, and the outer valve seat (7) has a rightward movement trend, so that the outer end face of the outer valve seat (7) compresses the first sealing ring (12); meanwhile, fluid in a region surrounded by the right end face of the inner valve seat (8) and the bottom of the sinking groove (14) applies pressure to the pressing ring (10) and the right end face of the inner valve seat (8), so that the left end face of the inner valve seat (8) is abutted against the right end face of the valve plate (23), and the pressing ring (10) presses the second sealing ring (22) between the baffle ring (21) and the pressing ring (10);
s2, when a worker wants to cut off the fluid, the operation method for cutting off the fluid is as follows: the handle at the top of the rotary joint (26) is positively rotated by a worker, the rotary joint (26) is driven by the handle to positively rotate, the nut (27) is driven by the rotary joint (26) to synchronously rotate, the upper valve rod (29) is driven by the screw (28) to downwards move under the cooperation of the nut (27) and the screw (28), the valve plate (23) is driven by the upper valve rod (29) to downwards move along the area surrounded by the inner valve seats (8) of the two combined double-valve-seat precise sealing structures (6), and when the through hole (31) of the valve plate (23) is misplaced with the first central hole (13) of the outer valve seat (7), fluid can be cut off.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310755341.9A CN116498760B (en) | 2023-06-26 | 2023-06-26 | Flat valve with combined double-valve-seat precise sealing structure and working method |
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| CN202310755341.9A CN116498760B (en) | 2023-06-26 | 2023-06-26 | Flat valve with combined double-valve-seat precise sealing structure and working method |
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| CN116498760A CN116498760A (en) | 2023-07-28 |
| CN116498760B true CN116498760B (en) | 2023-08-22 |
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| CN202310755341.9A Active CN116498760B (en) | 2023-06-26 | 2023-06-26 | Flat valve with combined double-valve-seat precise sealing structure and working method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116988759B (en) * | 2023-09-21 | 2023-12-08 | 什邡慧丰采油机械有限责任公司 | Full-automatic high-pressure-resistant intelligent manifold system and working method thereof |
| CN117685383B (en) * | 2024-02-04 | 2024-04-09 | 什邡慧丰采油机械有限责任公司 | 175MPa high pressure resistant flat valve capable of being opened and closed rapidly |
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