CN214466190U

CN214466190U - Valve seat structure of large-diameter butterfly valve

Info

Publication number: CN214466190U
Application number: CN202120017631.XU
Authority: CN
Inventors: 苏仕平; 刘涛; 俞金龙; 苏素珍; 黄祖军
Original assignee: Shanghai NoFive Valve Factory Co ltd
Current assignee: Shanghai NoFive Valve Factory Co ltd
Priority date: 2021-01-05
Filing date: 2021-01-05
Publication date: 2021-10-22
Anticipated expiration: 2031-01-05

Abstract

The utility model discloses a valve seat structure of a large-diameter butterfly valve, which relates to the technical field of valves and comprises a valve body, a butterfly plate, a valve seat and a sealing surface, wherein the valve seat is arranged on the valve body, and the joint of the butterfly plate and the valve seat is provided with the sealing surface; the side of the valve seat is provided with at least one annular groove. Through the utility model discloses an implement, because the setting of annular groove makes the disk seat form the structure of elastic lip on the surface of annular groove, utilizes the effect of medium pressure, increases the necessary specific pressure of valve seal face, realizes good sealed effect, compensaties the influence that geometric tolerances error of heavy-calibre butterfly plate in the processing brought for the valve performance, has improved security, the reliability of equipment.

Description

Valve seat structure of large-diameter butterfly valve

Technical Field

The utility model relates to a valve field especially relates to a heavy-calibre butterfly valve disk seat structure.

Background

The butterfly valve is a commonly used cut-off valve, which is mainly used for connecting or cutting off a medium in a pipeline and can also be used for regulating the flow of the medium, thereby being widely applied to pipelines under various working conditions such as petroleum, chemical engineering, metallurgy, electric power, water treatment and the like. The conventional butterfly valve comprises a valve body, a butterfly plate, a valve seat sealing ring, a valve rod, a driving device and the like, wherein the matching surface of the butterfly plate and the valve seat forms a sealing surface, the sealing surface realizes sealing by the contact of the valve seat and the butterfly plate, and therefore the sealing specific pressure of the sealing surface determines the key of whether the valve can be normally closed. However, because the size of the sealing surface of the large-diameter butterfly plate is relatively large, and certain machining errors and form and position tolerances exist after machining, under the closing force of the valve, when the sealing surfaces of the butterfly plate and the valve seat are mutually attached, the attached sealing surfaces are difficult to reach the specific pressure necessary for sealing, and the problems are solved by mainly improving the machining precision of the butterfly plate, reducing the form and position tolerances and the like in the prior art. However, the method inevitably increases the production cost and the processing difficulty, and in the use process of the valve, the scouring of the butterfly plate by the fluid also affects the sealing performance of the valve, thereby affecting the service life of the valve.

Therefore, those skilled in the art are dedicated to develop a valve seat structure of a large-diameter butterfly valve, which reduces the production cost and the processing difficulty, improves the reliability of the product and prolongs the service life of the product under the condition of ensuring that the required specific pressure of a valve sealing surface is reached.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is: how to solve the problem of leakage caused by the form and position tolerance error or the scouring of the butterfly plate in the processing of the large-diameter butterfly plate and improve the sealing performance of the valve.

In order to achieve the above object, the utility model provides a heavy-calibre butterfly valve disk seat structure, including valve body, butterfly plate, disk seat, sealed face, the disk seat set up in on the valve body, the butterfly plate with the laminating department of disk seat sets up sealed face.

Further, the side surface of the valve seat is provided with at least one annular groove.

Further, the annular groove is distributed on at least one side of the sealing surface.

Further, the valve seat forms a structure of an elastic lip on the surface of the annular groove.

Further, the annular groove is located on a right side surface of the valve seat.

Further, the opening of the annular groove is rightward.

Further, the butterfly valve is provided with a driving device, and the driving device drives the butterfly plate to be in contact with the valve seat.

Further, a valve rod is further provided, and the butterfly plate is rotated to the closed position through the valve rod.

Further, in a closed state, under the action of medium pressure, the change rate of the sealing specific pressure of the valve seat structure of the large-diameter butterfly valve is 0.1-0.3%.

Further, a valve seat sealing ring is further arranged on the valve body.

Compared with the prior art, the utility model discloses following beneficial technological effect has at least:

1) the sealing performance is good: because the utility model discloses a set up the annular groove on the disk seat, make the disk seat have certain elastic deformation under the oppression of butterfly plate, make the disk seat change with the contact of butterfly plate laminating, form good sealed face, compensate the problem that the washing away of geometric tolerances or butterfly plate brought the leakage.

2) Safe and reliable: due to the arrangement of the annular groove, the valve seat forms an elastic lip structure on the surface of the annular groove, the necessary specific pressure of a valve sealing surface is increased under the action of medium pressure, a good sealing effect is realized, and the influence of form and position tolerance errors of the large-diameter butterfly plate in machining on the performance of the valve is compensated. Under the condition that the required specific pressure of the valve sealing surface is reached, the switching torque of the control valve is considered, and the operation is convenient.

3) The service life is long: because the annular groove elastically deforms under the action of medium pressure, the scouring of fluid to the butterfly plate is reduced, and the service life of the valve is prolonged.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.

Drawings

FIG. 1 is a schematic view of a valve seat structure of a large-diameter butterfly valve according to the present invention;

wherein: 1-a valve body; 2-a butterfly plate; 3-valve seat; 4-sealing surface; 5-annular groove.

Detailed Description

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings for clarity and understanding of the technical contents. The present invention may be embodied in many different forms of embodiments, and the scope of the invention is not limited to the embodiments described herein.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.

The large-diameter butterfly valve seat structure shown in fig. 1 comprises a valve body 1, a butterfly plate 2, a valve seat 3, a sealing surface 4 and an annular groove 5, wherein the valve seat 3 is arranged on the valve body 1, and the sealing surface 4 is arranged at the joint of the butterfly plate 2 and the valve seat 3. At least one side surface of two sides of the sealing surface 4 of the valve seat 3 is provided with an annular groove 5, and the number of the annular grooves 5 is at least one. In this embodiment a ring groove 5 is located on the right side of the valve seat, the opening of the ring groove 5 being to the right. The valve body 1 is also provided with a valve seat sealing ring.

In the use of this embodiment, owing to set up annular groove 5 on disk seat 3, disk seat 3 forms the structure of elastic lip on the surface of annular groove 5, makes disk seat 3 have certain elastic deformation under the oppression of butterfly plate 2 to disk seat 3 is changeed and is contacted with the laminating of butterfly plate 2, forms good sealed face, remedies the problem that form and position tolerance or the washing away of butterfly plate brought the leakage. Under the action of medium pressure, the necessary specific pressure of the sealing surface 4 is increased, the sealing effect is further improved, and the influence of form and position tolerance errors of the large-caliber butterfly plate in machining on the performance of the valve is compensated. Under the condition that the specific pressure is required to reach the sealing surface 4, the switching torque of the control valve is considered, and the operation is convenient.

Compared with the prior art, the utility model discloses a heavy-calibre butterfly valve disk seat structure need not through the machining precision who improves the butterfly plate, reduces methods such as geometric tolerances, has reduced manufacturing cost and the processing degree of difficulty, under the valve closed condition through experimental research, under the effect of medium pressure, the utility model discloses the sealed ratio of change of pressure of disk seat is 0.1% ~ 0.3%, has realized good sealed effect, compensaties the influence that geometric tolerances error of heavy-calibre butterfly plate in the processing brought for the valve performance, has improved security, the reliability of equipment.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the teachings of this invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. The valve seat structure of the large-diameter butterfly valve is characterized by comprising a valve body, a butterfly plate, a valve seat and a sealing surface, wherein the valve seat is arranged on the valve body, the joint of the butterfly plate and the valve seat is provided with the sealing surface, the side surface of the valve seat is provided with at least one annular groove, and the annular groove is distributed on at least one side surface of the sealing surface.

2. A large diameter butterfly valve seat structure as claimed in claim 1, wherein said valve seat is formed with a resilient lip structure on a surface of said annular recess.

3. A large diameter butterfly valve seat structure as claimed in claim 1, wherein said annular groove is located on a right side surface of the valve seat.

4. A large-bore butterfly valve seat structure as claimed in claim 3, wherein said annular recess opens to the right.

5. A large diameter butterfly valve seat structure as claimed in claim 1, further comprising a driving means for driving said butterfly plate into contact with said valve seat.

6. A large bore butterfly valve seat structure as claimed in claim 5, further comprising a valve stem, said butterfly plate being moved to a closed position by rotation of said valve stem.

7. The large-diameter butterfly valve seat structure according to claim 1, wherein a specific seal pressure change rate of the large-diameter butterfly valve seat structure is 0.1% to 0.3% under a medium pressure in a closed state.

8. The large-caliber butterfly valve seat structure according to claim 1, wherein a valve seat sealing ring is further arranged on the valve body.