CN110822105A - Self-sealing structure butterfly valve - Google Patents
Self-sealing structure butterfly valve Download PDFInfo
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- CN110822105A CN110822105A CN201911275176.7A CN201911275176A CN110822105A CN 110822105 A CN110822105 A CN 110822105A CN 201911275176 A CN201911275176 A CN 201911275176A CN 110822105 A CN110822105 A CN 110822105A
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- Prior art keywords
- valve
- seat
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- valve seat
- self
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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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
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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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/42—Valve seats
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
The invention relates to the field of valves, and particularly discloses a butterfly valve with a self-sealing structure, which comprises a valve body, a first valve seat, a valve rod and a valve plate, wherein the valve body is arranged on a pipeline; the butterfly valve is also provided with a three-way reversing valve which is respectively connected with the front valve cavity, the balance cavity and the rear valve cavity. The invention has compact structure and reasonable and reliable arrangement, increases the sealing force by utilizing the self pressure of the medium when the valve is closed, pushes the first valve seat away from the sealing surface of the valve plate by the pressure of the medium through the conversion device when the valve is opened, and reduces the friction force, thereby reducing the torque force of the required actuating mechanism and reducing the manufacturing cost.
Description
Technical Field
The invention belongs to the technical field of valves, and particularly relates to a butterfly valve with a self-sealing structure.
Background
At present, especially in the application fields of large and medium caliber and medium and low pressure, the butterfly valve becomes the dominant valve form. The existing large-caliber high-pressure butterfly valve is complex in structure, machining needs to be completed by means of a tool during machining, the sealing force required by a butterfly plate and a valve seat is large, the friction force is large, in order to guarantee reliable sealing, an actuating mechanism needs to provide large torque, and the production cost is high.
Disclosure of Invention
The invention aims to provide a butterfly valve with a self-sealing structure, which utilizes the self pressure of a medium and reduces the required moment of an actuating mechanism and the manufacturing cost by reversing of a reversing valve.
In order to solve the technical problems, the invention provides a butterfly valve with a self-sealing structure, which comprises a valve body, a first valve seat, a valve rod and a valve plate, wherein the valve body is arranged on a pipeline; the butterfly valve is characterized in that a three-way reversing valve is further arranged on the butterfly valve, the three-way reversing valve is respectively connected with the front valve cavity, the balance cavity and the rear valve cavity, and the three-way reversing valve is communicated with the front valve cavity and the balance cavity or the balance cavity and the rear valve cavity.
Further, an elastic piece is arranged between the first valve seat and the second valve seat.
Furthermore, the second valve seat comprises a valve seat body and a valve seat opening protruding from the valve seat body, three stepped inner holes gradually increasing towards the pipeline direction are formed in the valve body, and the valve seat body is tightly attached to the second stepped inner hole of the valve body; one end of the first valve seat is tightly attached to the inner wall of the valve seat opening, the other end of the first valve seat is fixed on the valve body 1, and an elastic piece is arranged between the end part of the first valve seat and the valve seat body.
Specifically, be equipped with first sealing washer between the outer wall of disk seat body and the valve body.
Furthermore, the outer wall of the first valve seat is in a step shape, the first step is inserted into the valve seat opening of the second valve seat, and a second sealing ring is arranged between the side surface of the first step and the inner wall of the valve seat opening; a third sealing ring is arranged between the side surface of the second step and the hole wall of a second step inner hole of the inner wall of the valve body; the third step is tightly attached to the third step inner hole of the inner wall of the valve body.
Further, the valve seat body is provided with a conical hole, and the valve plate is arranged in the conical hole.
Furthermore, the valve body and the pipeline are fixed through bolts and nuts, and a sealing gasket is arranged between the first valve seat and the pipeline.
Further, the first valve seat and the valve body are fixed through screws.
Furthermore, the balance cavity is composed of the valve seat bodies of the first valve seat and the second valve seat and the outer wall of the valve seat opening.
Furthermore, a communicating hole communicated with the front cavity, the balance cavity and the rear cavity of the valve is formed in the valve body, and the communicating hole is connected with the three-way reversing valve through a connecting pipe.
The invention has the beneficial effects that: the invention has compact structure and reasonable and reliable arrangement, is suitable for occasions with large caliber, large pressure difference and the like, adopts the three-way reversing valve to realize the self-sealing principle of the valve, switches the connection and the disconnection of the valve cavity through the three-way reversing valve, utilizes the self pressure of a medium to increase the sealing force when the valve is closed, and pushes the first valve seat away from the sealing surface of the valve plate through the conversion device by the pressure of the medium when the valve is opened, thereby reducing the friction force, further reducing the torque force of a required actuating mechanism and reducing the manufacturing cost.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described 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 without creative efforts.
FIG. 1 is a schematic view of the butterfly valve of the present invention;
fig. 2 is an enlarged schematic view of a part of the structure of the butterfly valve of the invention.
In the figure: the valve comprises a valve body 1, a valve body 2, a first valve seat 3, a valve rod 4, a valve plate 5, a second valve seat 6, an elastic part 7, a first sealing ring 8, a second sealing ring 9, a third sealing ring 10, a sealing gasket 11, a pipeline 12, a three-way reversing valve, an A-valve front cavity, a B-balance cavity and a C-valve rear cavity.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the specification of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In a specific embodiment of the present invention, as shown in fig. 1, a self-sealing butterfly valve is specifically disclosed, which includes a valve body 1, a first valve seat 2, a valve rod 3, and a valve plate 4, where the valve body 1 is installed on a pipeline 11, the valve body 1 and the pipeline 11 are fixed by a bolt and a nut, the first valve seat 2 is disposed at one end of the valve body 1 connected to the pipeline 11, and a sealing gasket 10 is disposed between the first valve seat 2 and the pipeline 11.
The first valve seat 2 is arranged in the valve body 1, and the first valve seat 2 and the valve body 1 are fixed through screws. A second valve seat 5 is arranged between the valve body 1 and the first valve seat 2, the valve plate 4 is arranged on the second valve seat 5, and the valve rod 3 is arranged in the valve plate 4.
A valve front cavity A is formed among the valve body 1, the valve plate 4 and the second valve seat 5; the valve body 1, the first valve seat 2 and the second valve seat 5 form a balance cavity B, and the balance cavity B consists of valve seat bodies of the first valve seat 2 and the second valve seat 5 and outer walls of valve seat openings; the pipe 11 has a valve rear cavity C; the butterfly valve is further provided with a three-way reversing valve 12, the three-way reversing valve 12 is connected with the front valve cavity A, the balance cavity B and the rear valve cavity C through pipe fittings, and the three-way reversing valve 12 is communicated with the front valve cavity A and the balance cavity B or communicated with the balance cavity B and the rear valve cavity C. The valve body is provided with a communicating hole communicated with the front cavity A, the balance cavity B and the rear cavity C of the valve, and the communicating hole is connected with the three-way reversing valve through a connecting pipe.
An elastic member 6 is arranged between the end of the first valve seat 2 and the second valve seat 5, the elastic member 6 is preferably a spring, and the second valve seat 5 can axially displace in the valve body 1 under the action of the spring.
When the valve plate rotating mechanism works, the actuating mechanism drives the valve rod 3 to rotate, the valve plate 4 rotates along with the valve rod 3, the valve rod 3 is separated from the second valve seat 5 after rotating, and a medium passes through the valve plate. When the valve is closed, the three-way reversing valve 12 cuts off the communication between the valve front cavity A and the valve rear cavity C, and simultaneously communicates the valve front cavity A and the balance cavity B, and the sealing force is increased by using the self pressure of a medium; when the valve is opened, the three-way reversing valve 12 cuts off the communication between the valve front cavity A and the balance cavity B and simultaneously communicates the balance cavity B and the valve rear cavity C, so that the balance seal cavity B is decompressed, the second valve seat 5 is separated from the valve plate 4 by using the self pressure of a medium, and the friction force between the second valve seat and the valve plate is reduced; the valve can meet the requirements of opening and closing the valve by using smaller torque.
The specific sealing process and principle are as follows: as shown in fig. 2, P1 is the pre-valve media pressure, P2 is the post-valve media pressure, P3 is the spring seal force, P4 is the balance chamber media pressure; and the design is given that P1> P3, the media flow is from pre-valve chamber A to post-valve chamber C.
When the valve is closed, the three-way reversing valve 12 reverses and cuts off the communication between the N1 and the N3 end, so that the N1 is communicated with the N2; the pressure of the cavity A before the valve is balanced with that of the balance cavity B, the first valve seat 2 is contacted with the valve plate 4 under the action of a spring, and the sealing force between the second valve seat 5 and the valve plate 4 is P2+ P3+ P4.
1. When the pressure difference is large, P1 is greater than P2, P2 can be ignored, and P4 is P1, so that P3+ P4 is greater than P1, and the reliable sealing can be realized by utilizing the self pressure of the medium;
2. when the differential pressure is small, P1 is approximately equal to P2, P4 is equal to P1 and is equal to P2, the sealing force acting on the valve plate 4 is the spring sealing force P3, and P2+ P3+ P4 is greater than P1, so that reliable sealing can be realized;
when the valve is opened, the three-way reversing valve 1 reverses and cuts off the communication between the N1 and the N2 end, so that the N2 is communicated with the N3; the valve back cavity C is communicated with the balance cavity B, the pressure relief P2 of the balance seal cavity B is P4, and the sealing force acting on the first valve seat 3 and the valve plate 4 is P2+ P3+ P4.
1. When the pressure difference is larger, P1> P2, P2 and P4 can be ignored, because P1> P3, under the action of the pressure of the medium, the second valve seat 5 moves along the inner wall of the valve body 1 axially and is separated from the valve plate 4, and the valve plate 4 overcomes the friction force of the filler and can open the valve;
2. when the pressure difference is small, P1 is approximately equal to P2, P4 is equal to P2 is equal to P1, the sealing force acting on the valve plate 4 is the spring sealing force P3, and the valve can be opened by overcoming the spring sealing force;
the above results show that the valve can realize reliable sealing by using the medium pressure P1 when being closed and only overcoming the thrust of the spring; when the valve is opened, under the action of medium pressure P1, the second valve seat 5 is sealed and automatically separated from the valve plate 4 under the action of the medium pressure, and the valve plate is opened by overcoming the friction force of the packing; greatly reduces the thrust of the actuating mechanism, reduces the manufacturing cost and plays a positive role in improving the market competitiveness of products.
The above disclosure is only one preferred embodiment of the present invention, and certainly should not be construed as limiting the scope of the invention, which is defined by the claims and their equivalents.
Claims (10)
1. A butterfly valve with a self-sealing structure comprises a valve body (1), a first valve seat (2), a valve rod (3) and a valve plate (4), wherein the valve body (1) is installed on a pipeline (11), the first valve seat (2) is arranged in the valve body (1), and the butterfly valve is characterized in that a second valve seat (5) is arranged between the valve body (1) and the first valve seat (2), the valve plate (4) is arranged on the second valve seat (5), the valve rod (3) is arranged in the valve plate (4), a valve front cavity (A) is formed among the valve body (1), the valve plate (4) and the second valve seat (5), the valve body (1), the first valve seat (2) and the second valve seat (5) form a balance cavity (B), and the pipeline (11) is provided with a valve rear cavity (C); the butterfly valve is characterized in that a three-way reversing valve (12) is further arranged on the butterfly valve, the three-way reversing valve (12) is respectively connected with the front cavity (A), the balance cavity (B) and the rear cavity (C) of the valve, and the three-way reversing valve (12) is communicated with the front cavity (A) and the balance cavity (B) of the valve or communicated with the balance cavity (B) and the rear cavity (C) of the valve.
2. A self-sealing butterfly valve according to claim 1, characterised in that an elastic element (6) is provided between said first seat (2) and said second seat (5).
3. The butterfly valve with the self-sealing structure according to claim 2, wherein the second valve seat (5) comprises a valve seat body and a valve seat opening protruding from the valve seat body, three stepped inner holes gradually increasing towards the pipeline direction are formed in the valve body (1), and the valve seat body is tightly attached to the second stepped inner hole of the valve body (1); one end of the first valve seat (2) is tightly attached to the inner wall of the valve seat opening, the other end of the first valve seat is fixed on the valve body (1), and an elastic part (6) is arranged between the end part of the first valve seat (2) and the valve seat body.
4. A butterfly valve with self-sealing structure according to claim 3, characterised in that a first sealing ring (7) is arranged between the outer wall of the valve seat body and the valve body (1).
5. A butterfly valve with a self-sealing structure according to claim 3, characterised in that the outer wall of the first seat (2) is stepped, the first step is inserted into the seat mouth of the second seat (5), and a second sealing ring (8) is arranged between the side of the first step and the inner wall of the seat mouth; a third sealing ring (9) is arranged between the side surface of the second step and the hole wall of a second stepped inner hole in the inner wall of the valve body (1); the third step is tightly attached to the third step inner hole of the inner wall of the valve body (1).
6. A self-sealing butterfly valve according to claim 3, characterised in that said valve seat body has a conical bore in which said valve plate (4) is arranged.
7. A butterfly valve with self-sealing structure according to claim 1, characterised in that the valve body (1) is fixed to the pipe (11) by means of a bolt and a nut, and a sealing gasket (10) is provided between the first valve seat (2) and the pipe (11).
8. A self-sealing butterfly valve according to claim 1, characterised in that said first seat (2) is fixed to said valve body (1) by means of screws.
9. A self-sealing butterfly valve according to claim 5, characterised in that said balancing chamber (B) is formed by the body of the first (2) and second (5) valve seats and by the outer wall of the valve seat mouth.
10. The butterfly valve with the self-sealing structure according to claim 1, wherein the valve body is provided with a communication hole for communicating the front valve cavity (A), the balance cavity (B) and the rear valve cavity (C), and the communication hole is connected with the three-way reversing valve through a connecting pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911275176.7A CN110822105A (en) | 2019-12-12 | 2019-12-12 | Self-sealing structure butterfly valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911275176.7A CN110822105A (en) | 2019-12-12 | 2019-12-12 | Self-sealing structure butterfly valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110822105A true CN110822105A (en) | 2020-02-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911275176.7A Pending CN110822105A (en) | 2019-12-12 | 2019-12-12 | Self-sealing structure butterfly valve |
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| Country | Link |
|---|---|
| CN (1) | CN110822105A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111927967A (en) * | 2020-09-21 | 2020-11-13 | 天津市塘沽第一阀门有限公司 | Two-way self sealss device of two eccentric butterfly valve hard seal disk seats |
-
2019
- 2019-12-12 CN CN201911275176.7A patent/CN110822105A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111927967A (en) * | 2020-09-21 | 2020-11-13 | 天津市塘沽第一阀门有限公司 | Two-way self sealss device of two eccentric butterfly valve hard seal disk seats |
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