CN107420573B - High-temperature-resistant high-pressure-resistant bidirectional hard sealing ball valve with pretension compensation movable valve seat - Google Patents
High-temperature-resistant high-pressure-resistant bidirectional hard sealing ball valve with pretension compensation movable valve seat Download PDFInfo
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- CN107420573B CN107420573B CN201710493905.0A CN201710493905A CN107420573B CN 107420573 B CN107420573 B CN 107420573B CN 201710493905 A CN201710493905 A CN 201710493905A CN 107420573 B CN107420573 B CN 107420573B
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- 238000007789 sealing Methods 0.000 title claims abstract description 92
- 230000002457 bidirectional effect Effects 0.000 title description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 35
- 229910002804 graphite Inorganic materials 0.000 claims description 35
- 239000010439 graphite Substances 0.000 claims description 35
- 210000004907 gland Anatomy 0.000 claims description 27
- 239000010935 stainless steel Substances 0.000 claims description 18
- 229910001220 stainless steel Inorganic materials 0.000 claims description 18
- 238000012856 packing Methods 0.000 claims description 17
- 238000011010 flushing procedure Methods 0.000 claims description 12
- 230000009471 action Effects 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 9
- 239000002344 surface layer Substances 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 9
- 238000013461 design Methods 0.000 abstract description 2
- 238000011161 development Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005493 welding type Methods 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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0663—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
- F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
- F16K27/067—Construction of housing; Use of materials therefor of taps or cocks with spherical plugs
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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
- F16K27/12—Covers for housings
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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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
-
- 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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
- F16K5/14—Special arrangements for separating the sealing faces or for pressing them together
- F16K5/20—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces
- F16K5/204—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces with the plugs or parts of the plugs mechanically pressing the seals against the housing
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
- Sealing Devices (AREA)
Abstract
The utility model provides a pretension compensation removes high temperature and high pressure resistant two-way hard seal ball valve of disk seat, including the valve body, the valve rod, ejector pin and valve clack, presume the central line of valve body along controlling the horizontal direction setting, the valve rod stretches into in the valve body along stretching into from top to bottom, rotate between valve rod and the valve body and pass through seal assembly and connect, the ejector pin stretches into in the valve body along the valve body radial from bottom to top, ejector pin and valve body fixed connection, the valve body lower extreme is provided with bottom and sealing gasket that is used for shutoff ejector pin, the central line coincidence of valve rod and ejector pin, the valve clack is established in the valve body, valve rod lower extreme and valve clack left side upper portion fixed connection, valve clack left side lower part passes through the axle sleeve rotation and connects on the ejector pin, be provided with movable disk seat seal structure between valve clack right side circumference inner wall; the invention has the advantages of easy realization of the structure process, reasonable design, good sealing effect, easy adjustment, convenient maintenance and replacement, is a novel structure, integrates the advantages of a butterfly valve and a ball valve, and is a novel valve with development and creativity.
Description
Technical Field
The invention relates to a valve, in particular to a high-temperature and high-pressure resistant bidirectional hard sealing rotary ball valve with a pretension compensation movable valve seat.
Background
The rotary ball valve is a new structure type valve developed in recent years, and is widely applied to urban central heating and high-pressure steam pipelines for opening, closing or regulating medium flow. The structure of the current ball valve is only used for a flange type structure, and because the structure is limited by the form of a baffle plate for fixing a movable valve seat, the baffle plate is fixed on a valve body by a fastening screw and needs to extend outwards for a certain section, so that the flange type structure has the position to be used, and the situation that the ball valve is only used for a flange type valve in recent years is caused. In addition, the auxiliary sealing mode of the existing movable valve seat structure and the pretightening force for motion compensation are realized by an O-shaped rubber ring, and the valve seat structure cannot be used on a high-temperature and high-pressure pipeline due to the temperature limitation of an O-shaped ring material; the welding connection mode in the valve is commonly used for pipeline connection and is used for high-temperature and high-pressure pipelines, and the external connection position is equivalent to the pipe wall due to the fact that the welding type valve does not have a flange in the existing structure mode, and the existing structure is difficult to realize.
Disclosure of Invention
The invention provides a high-temperature and high-pressure resistant bidirectional hard sealing ball valve with a pretension compensation moving valve seat, which aims to solve the defects in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a pretension compensation removes valve seat high temperature high pressure resistant two-way hard seal ball valve, which comprises a valve body, the valve rod, ejector pin and valve clack, it sets up along controlling the horizontal direction to presume the central line of valve body, the valve rod stretches into in the valve body along the valve body radial direction from top to bottom, rotate between valve rod and the valve body and pass through seal assembly and connect, the ejector pin stretches into in the valve body along the valve body radial direction from bottom to top, ejector pin and valve body fixed connection, the valve body lower extreme is provided with bottom and sealing gasket that is used for shutoff ejector pin, the central line coincidence of valve rod and ejector pin, the valve clack is established in the valve body, the valve rod lower extreme is fixedly connected with the interior square hole that valve clack left side upper portion set up, valve clack left side lower part passes through the axle sleeve rotation and connects on the ejector pin, be provided with movable valve seat seal structure between valve clack right side circumference inner wall;
the movable valve seat sealing structure comprises a valve seat, a sealing gland, a first baffle and a first clamping ring, wherein the valve seat, the sealing gland, the first baffle and the first clamping ring are integrally of a circular ring structure, an outer circular step is arranged on the circumferential inner wall of the valve body adjacent to the right side of the valve rod, an inner circular step matched with the outer circular step is arranged on the outer circumference of the valve seat, first flexible graphite positioned on the right side of the outer circular step is filled between the outer circular surface of the valve seat and the inner wall of the valve body, the outer circles of the sealing gland, the first baffle and the first clamping ring are all in contact with the inner wall of the valve body, an annular pressing plate for pressing the first flexible graphite leftwards is arranged on the left side of the sealing gland, the first baffle is positioned on the right side of the sealing gland, a first clamping ring groove positioned on the right side of the first baffle is arranged on the inner wall of the valve body, a plurality of first clamping screws are uniformly and at intervals in the circumferential direction of the first baffle, and the left end of the first clamping screws are pressed against the right side of the sealing gland, so that the annular pressing plate is pressed against the first flexible graphite to realize high-temperature sealing;
an adjustable main seal driving mechanism which is in pressing fit with the right side of the valve seat is arranged on the inner wall of the valve body; under the action of the adjustable main seal driving mechanism, the outer circumferential surface of the valve clack is in compression joint sealing fit with the left inner circumferential surface of the valve seat through the main seal pair.
The adjustable main seal driving mechanism comprises a push plate, a spring, a second baffle and a second clamping ring, wherein the whole push plate, the spring, the second baffle and the second clamping ring are all of circular ring structures, a plurality of installation grooves which are uniformly and alternately arranged are formed in the right end face of the valve seat along the circumferential direction, the spring is arranged in the installation grooves, the right end of the spring extends out of the installation grooves, the left end of the push plate is in jacking fit with the right end of the spring, the outer circle of the right side of the push plate is in contact with the circumferential inner wall of the valve body, the inner wall of the valve body is provided with a second clamping ring groove positioned on the right side of the second baffle, the second baffle is positioned on the right side of the push plate and is in threaded connection with second set screws along the left-right direction, the second set screws are uniformly and alternately arranged in a plurality, the left end of the second set screws are propped against the right end face of the push plate, and the outer edge of the right end face of the second baffle is in jacking contact with the second clamping ring.
The main sealing pair comprises a conical structure with left and right thick and thin outer circumferential surfaces of the valve clack and the left inner circumferential surface of the valve seat, and a stainless steel surface layer with a slightly-bulging middle and spherical structure is overlaid on the surface of the conical structure of the outer circumferential surface of the valve clack; under the action of the spring, the stainless steel surface layer on the valve clack is in pressure welding sealing fit with the left inner circular surface of the valve seat.
The sealing assembly comprises a valve neck which is integrated with the valve body, a valve rod penetrates through the valve neck to extend into the valve body, a limiting ring which is in contact with the outer wall of the valve rod is arranged on the valve body, a sealing cavity which is positioned above the limiting ring is arranged between the inner wall of the valve neck and the outer wall of the valve rod, a step groove is formed in the upper portion of the sealing cavity on the valve neck, a lower stainless steel sleeve, second flexible graphite and an upper stainless steel sleeve are sequentially arranged in the sealing cavity from bottom to top, a graphite sealing gasket, a anti-flushing sleeve and a packing gland are sequentially arranged at the step groove from bottom to top, graphite packing is arranged between the inner wall of the anti-flushing sleeve and the outer wall of the valve rod, the packing gland and the anti-flushing sleeve are fixedly connected with the valve neck through an inner hexagonal bolt which is parallel to the valve rod, the lower end of the anti-flushing sleeve is tightly pressed against the graphite sealing gasket and the upper stainless steel sleeve under the action of the inner hexagonal bolt, and the lower end of the packing gland is tightly pressed against the graphite packing.
By adopting the technical scheme, the invention has the following technical effects:
1. the auxiliary sealing structure adopts the first flexible graphite with high temperature resistance to replace the existing O-shaped rubber sealing ring, so that the use of the invention is not limited by temperature. The realization of the auxiliary sealing structure form is that a packing pool is formed after the assembly between the inner wall of the valve body and the outer wall of the valve seat, the first flexible graphite is placed in the packing pool, the first flexible graphite is pressed and fixed between the valve body and the valve seat by a top pressing structure consisting of a sealing gland, a first baffle plate, a first clamping ring and a first fastening screw, and the valve seat can move between the contact surfaces of the first flexible graphite.
2. The valve seat is pressed by the pre-tightening force generated by the spring instead of the pre-tightening force generated by compressing the O-shaped rubber ring, so that the valve seat is not influenced by temperature, and the generated pre-tightening force is stable and durable.
3. The valve body is internally provided with the second clamping ring, the second baffle, the second set screw, the second push plate and the spring on the right side, so that the moving range of the valve seat, the compression degree between the valve seat and the valve clack and the moving limit are regulated and fixed, and a good main sealing effect is achieved.
4. The invention adopts a main sealing pair mode: the sealing surface of the outer circumference of the valve clack adopts a stainless steel surface layer which is a spherical surface with a slightly-bulging middle part, and the sealing surface of the valve seat is a conical surface, so that the main sealing pair is in a linear sealing mode, the sealing specific pressure is increased, and good metal sealing is realized.
5. The clamping ring structure is adopted to replace the fixed form of the screw, so that the space position is saved, and the structure which cannot be applied is well expanded due to the adoption of the clamping ring structure, such as the welded ball valve.
6. The valve rod rotates to drive the valve clack to rotate to realize the opening and closing of the valve, and the valve rod and the valve neck are sealed by adopting the second flexible graphite, the graphite sealing gasket and the graphite filler, so that the sealing effect is good, and the valve can bear higher temperature.
The ball valve adopts the first flexible graphite and the second flexible graphite as auxiliary sealing materials, so that the temperature resistance of the valve is improved, namely the valve can resist high temperature, and the valve seat is pushed to the sealing surface by the thrust movement of a medium, and the sealing effect is better along with the sealing tightness of the pressure improvement, so that the valve can resist high temperature and high pressure. In addition, the pre-tightening spring is designed to give the thrust of the valve seat and simultaneously perform displacement compensation, when the medium flows from left to right, the pre-tightening thrust of the spring and the medium are opposite to each other, the acting force of the medium can be resisted, and the magnitude of the opposing force can be adjusted by the tightening screw, so that the valve can bear pressure in both directions, and a good two-way sealing effect is obtained. The main sealing pair adopts a build-up welding stainless steel material or hard alloy material layer, and is generally in metal-to-metal sealing, so the subject of the invention is called a pretension compensation movable valve seat high-temperature and high-pressure resistant bidirectional hard sealing rotary ball valve.
The invention has the advantages of easy realization of the structure process, reasonable design, good sealing effect, easy adjustment, convenient maintenance and replacement, is a novel structure, integrates the advantages of a butterfly valve and a ball valve, and is a novel valve with development and creativity.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an enlarged view at A in FIG. 1;
fig. 3 is an enlarged view at B in fig. 1.
Detailed Description
As shown in fig. 1, 2 and 3, the high-temperature and high-pressure resistant bidirectional hard seal rotary ball valve of the pre-tightening compensation movable valve seat comprises a valve body 1, a valve rod 2, a push rod 3 and a valve clack 4, wherein the valve rod 2 extends into the valve body 1 from top to bottom along the radial direction of the valve body 1, the valve rod 2 rotates with the valve body 1 and is connected with the valve body 1 through a sealing component, the push rod 3 extends into the valve body 1 from bottom to top along the radial direction of the valve body 1, the push rod 3 is fixedly connected with the valve body 1, the lower end of the valve body 1 is provided with a bottom cover 5 and a sealing gasket 6 for sealing the push rod 3, the central lines of the valve rod 2 and the push rod 3 are overlapped, the valve clack 4 is arranged in the valve body 1, the lower end of the valve rod 2 is fixedly connected with the upper left side part of the valve clack 4, the lower left side of the valve clack 4 is rotationally connected with the push rod 3 through a shaft sleeve 7, and a movable valve seat sealing structure is arranged between the right side part of the valve clack 4 and the right side circumferential inner wall of the valve body 1;
the movable valve seat sealing structure comprises a valve seat 8, a sealing gland 9, a first baffle 10 and a first clamping ring 11 which are integrally in a circular structure, an outer circular step is arranged on the circumferential inner wall of the valve body 1 adjacent to the right side of the valve rod 2, an inner circular step matched with the outer circular step is arranged on the outer circumference of the valve seat 8, first flexible graphite 12 positioned on the right side of the outer circular step is filled between the outer circular surface of the valve seat 8 and the inner wall of the valve body 1, the outer circles of the sealing gland 9, the first baffle 10 and the first clamping ring 11 are all in contact with the inner wall of the valve body 1, an annular pressing plate 13 for pressing the first flexible graphite 12 leftwards is arranged on the left side of the sealing gland 9, the first baffle 10 is positioned on the right side of the sealing gland 9, a first clamping ring groove positioned on the right side of the first baffle 10 is arranged on the inner wall of the valve body 1, first clamping rings 11 are arranged in the first clamping ring grooves, the first baffle 10 is in threaded connection with first set screws 14 along the left and right directions, the first set screws are uniformly and at intervals along the circumferential direction of the first baffle 10, and the left ends of the first set screws 14 are pressed against the sealing gland 9 to press the right side of the first flexible graphite 12 at the left ends of the first set screws 14 so as to realize high-temperature sealing;
an adjustable main seal driving mechanism which is in pressing fit with the right side of the valve seat 8 is arranged on the inner wall of the valve body 1; under the action of the adjustable main seal driving mechanism, the outer circumferential surface of the valve clack 4 is in compression joint sealing fit with the left inner circumferential surface of the valve seat 8 through a main seal pair.
The adjustable main seal driving mechanism comprises a push plate 15, a spring 16, a second baffle 17 and a second clamping ring 18, wherein the whole push plate 15, the spring 16, the second baffle 17 and the second clamping ring 18 are all of annular structures, a plurality of mounting grooves which are uniformly and alternately arranged are formed in the right end face of the valve seat 8 along the circumferential direction, the spring 16 is arranged in the mounting grooves, the right end of the spring 16 extends out of the mounting grooves, the left end of the push plate 15 is in jacking fit with the right end of the spring 16, the outer circle on the right side of the push plate 15 is in contact with the circumferential inner wall of the valve body 1, a second clamping ring groove which is positioned on the right side of the second baffle 17 is arranged on the inner wall of the valve body 1, the second clamping ring 18 is arranged in the second clamping ring groove, the second baffle 17 is positioned on the right side of the push plate 15, a plurality of second set screws 19 are uniformly and alternately arranged along the circumferential direction of the second baffle 17, the left end of the second set screws 19 are in jacking contact with the second clamping ring 18.
The main sealing pair comprises a conical structure with left thick and right thin outer circumferential surface of the valve clack 4 and left inner circumferential surface of the valve seat 8, and a stainless steel surface layer 20 with a slightly-bulging middle and spherical structure is overlaid on the conical structure surface of the outer circumferential surface of the valve clack 4; under the action of the spring 16, the stainless steel surface layer 20 on the valve clack 4 is in pressure-contact sealing fit with the left inner circular surface of the valve seat 8.
The sealing assembly comprises a valve neck 21 which is integrated with a valve body 1, a valve rod 2 penetrates through the valve neck 21 and stretches into the valve body 1, a limiting ring 22 which is in contact with the outer wall of the valve rod 2 is arranged on the valve body 1, a sealing cavity which is positioned above the limiting ring 22 is arranged between the inner wall of the valve neck 21 and the outer wall of the valve rod 2, a stepped groove is formed in the upper part of the sealing cavity on the valve neck 21, a lower stainless steel sleeve 23, second flexible graphite 24 and an upper stainless steel sleeve 25 are sequentially arranged in the sealing cavity from bottom to top, a graphite sealing gasket 6, a flushing cover 26 and a packing gland 27 are sequentially arranged at the stepped groove from bottom to top, graphite packing 28 is arranged between the inner wall of the flushing cover 26 and the outer wall of the valve rod 2, the packing gland 27 and the flushing cover 26 are fixedly connected with the valve neck 21 through an inner hexagonal bolt 29 which is parallel to the valve rod 2, and the lower end of the flushing cover 26 is tightly pressed against the graphite sealing gasket 6 and the upper stainless steel sleeve 25 under the action of the inner hexagonal bolt 29, and the lower end of the packing gland 27 is tightly pressed against the graphite packing 28.
The valve rod 2 in the invention drives the valve clack 4 to rotate to realize the opening and closing of the valve, and the spiral ball valve adopts the first flexible graphite 12 and the second flexible graphite 24 as auxiliary sealing materials, so that the temperature resistance of the valve is improved, namely the valve can resist high temperature, and the valve seat 8 is moved by the thrust of a medium to push the valve seat to a sealing surface, so that the sealing effect is better along with the improvement of pressure, and the valve can resist high temperature and high pressure. In addition, the pre-tightening spring 16 is designed to give thrust to the valve seat 8 and perform displacement compensation, when the medium flows from left to right, the pre-tightening thrust of the spring 16 and the direction opposite to the medium can resist the acting force of the medium, and the magnitude of the opposite force is regulated by the tightening screw, so that the valve can bear pressure in both directions, and a good bidirectional sealing effect is obtained. The main sealing pair adopts a build-up welding stainless steel material or hard alloy material layer, and is generally in metal-to-metal sealing, so the subject of the invention is called a high-temperature and high-pressure resistant bidirectional hard sealing rotary ball valve with a pretension compensation movable valve seat 8.
The above embodiments are only for illustrating the technical solution of the present invention, and it should be understood by those skilled in the art that although the present invention has been described in detail with reference to the above embodiments: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention, which is intended to be encompassed by the claims.
Claims (1)
1. The utility model provides a high temperature and high pressure resistant two-way hard seal rotary ball valve of pretension compensation removal disk seat, which comprises a valve body, the valve rod, ejector pin and valve clack, it sets up along controlling the horizontal direction to assume the central line of valve body, valve rod top-down radially stretches into in the valve body along the valve body, rotate between valve rod and the valve body and be connected through seal assembly, the ejector pin radially stretches into in the valve body along the valve body from bottom to top, ejector pin and valve body fixed connection, the valve body lower extreme is provided with bottom and sealing gasket that is used for shutoff ejector pin, the central line coincidence of valve rod and ejector pin, the valve clack is established in the valve body, the valve rod lower extreme is connected on the ejector pin with the interior square hole fixed connection that valve clack left side upper portion set up, valve clack left side lower part is rotated through the axle sleeve, its characterized in that: a movable valve seat sealing structure is arranged between the right side part of the valve clack and the right side circumferential inner wall of the valve body;
the movable valve seat sealing structure comprises a valve seat, a sealing gland, a first baffle and a first clamping ring, wherein the valve seat, the sealing gland, the first baffle and the first clamping ring are integrally of a circular ring structure, an outer circular step is arranged on the circumferential inner wall of the valve body adjacent to the right side of the valve rod, an inner circular step matched with the outer circular step is arranged on the outer circumference of the valve seat, first flexible graphite positioned on the right side of the outer circular step is filled between the outer circular surface of the valve seat and the inner wall of the valve body, the outer circles of the sealing gland, the first baffle and the first clamping ring are all in contact with the inner wall of the valve body, an annular pressing plate for pressing the first flexible graphite leftwards is arranged on the left side of the sealing gland, the first baffle is positioned on the right side of the sealing gland, a first clamping ring groove positioned on the right side of the first baffle is arranged on the inner wall of the valve body, a plurality of first clamping screws are uniformly and at intervals in the circumferential direction of the first baffle, and the left end of the first clamping screws are pressed against the right side of the sealing gland, so that the annular pressing plate is pressed against the first flexible graphite to realize high-temperature sealing;
an adjustable main seal driving mechanism which is in pressing fit with the right side of the valve seat is arranged on the inner wall of the valve body; under the action of the adjustable main seal driving mechanism, the outer circumferential surface of the valve clack is in compression joint sealing fit with the left inner circumferential surface of the valve seat through a main seal pair;
the adjustable main seal driving mechanism comprises a push plate, a spring, a second baffle and a second clamping ring, wherein the whole push plate, the spring, the second baffle and the second clamping ring are all in circular structures, a plurality of mounting grooves which are uniformly and alternately arranged are formed in the right end face of the valve seat along the circumferential direction, the spring is arranged in the mounting grooves, the right end of the spring extends out of the mounting grooves, the left end of the push plate is in jacking fit with the right end of the spring, the outer circle of the right side of the push plate is in contact with the circumferential inner wall of the valve body, the inner wall of the valve body is provided with a second clamping ring groove positioned on the right side of the second baffle, the second baffle is arranged in the second clamping ring groove, the second baffle is connected with second set screws along the left-right direction in a threaded manner, a plurality of second set screws are uniformly and alternately arranged along the circumferential direction of the second baffle, the left end of the second set screws are propped against the right end face of the push plate, and the outer edge of the right end face of the second baffle is in jacking contact with the second clamping ring;
the main sealing pair comprises a conical structure with left and right thick and thin outer circumferential surfaces of the valve clack and the left inner circumferential surface of the valve seat, and a stainless steel surface layer with a slightly-bulging middle and spherical structure is overlaid on the surface of the conical structure of the outer circumferential surface of the valve clack; under the action of a spring, a stainless steel surface layer on the valve clack is in pressure welding sealing fit with the left inner circular surface of the valve seat;
the sealing assembly comprises a valve neck which is integrated with the valve body, a valve rod penetrates through the valve neck to extend into the valve body, a limiting ring which is in contact with the outer wall of the valve rod is arranged on the valve body, a sealing cavity which is positioned above the limiting ring is arranged between the inner wall of the valve neck and the outer wall of the valve rod, a step groove is formed in the upper portion of the sealing cavity on the valve neck, a lower stainless steel sleeve, second flexible graphite and an upper stainless steel sleeve are sequentially arranged in the sealing cavity from bottom to top, a graphite sealing gasket, a anti-flushing sleeve and a packing gland are sequentially arranged at the step groove from bottom to top, graphite packing is arranged between the inner wall of the anti-flushing sleeve and the outer wall of the valve rod, the packing gland and the anti-flushing sleeve are fixedly connected with the valve neck through an inner hexagonal bolt which is parallel to the valve rod, the lower end of the anti-flushing sleeve is tightly pressed against the graphite sealing gasket and the upper stainless steel sleeve under the action of the inner hexagonal bolt, and the lower end of the packing gland is tightly pressed against the graphite packing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710493905.0A CN107420573B (en) | 2017-06-26 | 2017-06-26 | High-temperature-resistant high-pressure-resistant bidirectional hard sealing ball valve with pretension compensation movable valve seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710493905.0A CN107420573B (en) | 2017-06-26 | 2017-06-26 | High-temperature-resistant high-pressure-resistant bidirectional hard sealing ball valve with pretension compensation movable valve seat |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107420573A CN107420573A (en) | 2017-12-01 |
| CN107420573B true CN107420573B (en) | 2023-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710493905.0A Active CN107420573B (en) | 2017-06-26 | 2017-06-26 | High-temperature-resistant high-pressure-resistant bidirectional hard sealing ball valve with pretension compensation movable valve seat |
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| CN (1) | CN107420573B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN107420573A (en) | 2017-12-01 |
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