CN217381669U

CN217381669U - Two-piece floating metal sealing butterfly valve

Info

Publication number: CN217381669U
Application number: CN202220695407.0U
Authority: CN
Inventors: 潘建达; 郝文明; 王奕彤
Original assignee: Founder Valve Group Co ltd
Current assignee: Founder Valve Group Co ltd
Priority date: 2022-03-25
Filing date: 2022-03-25
Publication date: 2022-09-06
Anticipated expiration: 2032-03-25

Abstract

The utility model discloses a two-piece floating metal sealing butterfly valve, which comprises a two-piece valve body, wherein the two-piece valve body is formed by fixedly connecting a main valve body and a connecting disc through a fastener, the connecting disc is coaxial with the center of the main valve body, and a medium channel is arranged inside the connecting disc; still including two floating seal pair mechanisms, including the metal disk seat sets up between the main valve body and connection pad, the metal disk seat can radial movement and axial fixity for the main valve body and connection pad, and the cover is equipped with on the surface of revolution of dish board the metal seal ring, the dish board clamping ring for the metal seal ring leans on tightly on the dish board, the metal seal ring can radial movement for dish board and dish board clamping ring, the metal seal ring can with the sealed cooperation of metal disk seat. Above-mentioned technical scheme has realized two formula valve body structures, the two floating structures of metal seal ring, metal disk seat. The scheme reduces the processing precision requirement of the metal sealing pair and saves the maintenance period and cost.

Description

Two-piece floating metal sealing butterfly valve

Technical Field

The utility model relates to a butterfly valve further relates to two formula metal seal butterfly valves that float.

Background

The existing butterfly valve is a common valve, including the valve block, the upper valve bonnet, actuator and valve shaft, there are fluid medium channels in the valve block, the upper valve bonnet is set up in the upper portion of the valve block, the actuator is set up in the upper portion of the upper valve bonnet, the valve shaft rotates axially along the vertical direction in the valve block, one end of the valve shaft connects the actuator, driven by the actuator, the part that the valve shaft locates in flow path installs the butterfly plate rotating synchronously with the valve shaft, there are metal valve seats integrally on the valve block, the metal valve seat cooperates with butterfly plate seal, because the metal valve seat is integrally set up in the valve block, can't adjust the relative position of butterfly plate and metal valve seat after the butterfly plate is fixed, the requirement for the machining precision is greater, and after the metal valve seat is damaged, can only dismantle or cut the valve block from the pipeline and repair, the maintenance difficulty is great, the downtime is long, the cost is high; still some butterfly valves's metal disk seat does not set up with valve body an organic whole, but its fixed establishment is complicated, has increased the degree of difficulty of assembly and processing, need place metal disk seat and three division snap rings at valve body cavity processing slot, and it is limited to install holding screw through three division snap rings and to limit the metal disk seat, also does not improve the relative position of metal disk seat and dish board, and is great to the machining precision requirement of metal disk seat, and the life of valve is shorter.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the shortcoming and not enough that prior art exists, and provide two formula metal seal butterfly valves that float.

The technical scheme of the utility model is that the two-piece floating metal seal butterfly valve comprises a valve body, a disc plate, a valve shaft, an actuator, a metal valve seat, a metal seal ring and a disc plate pressing ring, wherein the valve body is a two-piece valve body, the two-piece valve body is formed by fixedly connecting a main valve body and a connecting disc through a fastener, the connecting disc is coaxial with the center of the main valve body, and a medium channel is arranged inside the connecting disc; still including two floating seal pair mechanisms, including the metal disk seat sets up between the main valve body and connection pad, the metal disk seat can radial movement and axial fixity for the main valve body and connection pad, and the cover is equipped with on the surface of revolution of dish board the metal seal ring, the dish board clamping ring for the metal seal ring leans on tightly on the dish board, the metal seal ring can radial movement for dish board and dish board clamping ring, the metal seal ring can with the sealed cooperation of metal disk seat.

According to the technical scheme, the double-floating sealing pair structure is adopted, the sealing pair is automatically aligned and matched, and the sealing performance is reliable. By adopting the structural design of the two-piece type valve body, the specification number of parts is reduced compared with the butterfly valves of the same type, the parts are disassembled simply and conveniently, the field replacement is simple and easy, the maintenance period and the cost are saved, and the pure metal sealing pair matching structure is adopted, so that the valve is scouring-resistant and long in service life.

The butterfly valve adopts a three-eccentric metal sealing structure, namely, the valve shaft is rotatably arranged in a radial eccentric shaft hole of the main valve body, the valve shaft in the axial medium channel of the main valve body is fixedly connected with the disc plate, the disc plate and the valve shaft are eccentrically arranged in the direction of the medium channel of the main valve body, the disc plate and the valve shaft can swing in the axial medium channel of the main valve body around the central line of the valve shaft, and the sealing matching surface of the metal sealing ring and the valve seat on the disc plate is at the eccentric position of the valve shaft.

According to the technical scheme, the two-piece floating metal seal butterfly valve adopts a three-eccentric metal seal structure, the valve seal pair is in contact and sealing, the valve is opened and separated, the torque generates elastic sealing, and zero leakage can be realized.

And further, a sealing ring groove is formed in the axial end face of one side of the metal valve seat, and a sealing ring is arranged in the sealing ring groove and used for sealing and matching the main valve body and the metal valve seat.

Further, the connecting disc is a rotary hollow body, a pipeline flange fixedly connected with the main valve body is arranged on one axial end side of the connecting disc, a pipeline flange fixedly connected with a pipeline is arranged on the other axial end side of the connecting disc,

further, the inner diameter of the middle medium channel of the connecting disc is between the inner diameter and the outer diameter of the metal valve seat.

Further the main valve body with the terminal surface that the connection pad is connected sets up the metal valve seat and holds the chamber, hold the chamber with main valve body axial medium passageway is coaxial, hold the chamber diameter and be equivalent to the outer axial face diameter of the corresponding complex of metal valve seat plus 1 to 2 millimeters, the metal valve seat holds the intracavity and sets up the plane with the sealed complex of metal valve seat.

And further, a sealing ring groove is formed in the end face, connected with the connecting disc, of the main valve body, and a sealing ring is arranged in the sealing ring groove and used for sealing the main valve body and the connecting disc.

And a sealing groove is formed in the annular surface of the disc plate, which is in axial contact with the metal sealing ring, and a sealing gasket is arranged in the sealing groove and used for sealing and matching the disc plate and the metal sealing ring.

Further, the inner diameter of the metal sealing ring is equal to the size of the shaft matched with the disc plate and the metal sealing ring plus 1 to 2 millimeters.

Further, the inner ring surface of the metal valve seat is provided with a hard alloy coating with the thickness of 0.2 mm.

The scheme is further optimized, leakage is reduced or eliminated in the process of using the butterfly valve, the strength of the sealing pair is strengthened, the service life of the butterfly valve is further prolonged, and the like.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and obviously, the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for a person skilled in the art to obtain other drawings according to these drawings without creative efforts;

FIG. 1 is a schematic structural view of a two-piece floating metal seal butterfly valve of the present invention;

FIG. 2 is an enlarged sectional view of a portion A of the two-piece floating metal seal butterfly valve of the present invention;

in the figure, 1-connecting disc, 2-O-shaped ring, 3-metal valve seat, 4-metal sealing ring, 5-butterfly plate pressing ring, 6-inner hexagonal cylindrical head screw, 7-butterfly plate, 8-valve shaft, 9-main valve body, 91-medium channel, 92-valve seat accommodating cavity, 10-sealing gasket, 11-upper valve cover, 12-actuator and 13-valve shaft cover.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings.

Fig. 1 and 2 show an embodiment of the two-piece floating metal seal butterfly valve of the present invention, which includes a valve shaft 8 made of stainless steel, a main valve body 9, a connection disc 1, a disc 7 and a disc pressing ring 5, where the two-piece valve body is divided into two pieces, the valve body is formed by fixedly connecting the main valve body 9 and the connection disc 1 through a fastener, the connection disc 1 is coaxial with the main valve body 9, and a medium passage 91 is provided inside the connection disc 1; the adoption of the three-eccentric metal sealing structure means that the valve shaft 8 is rotatably arranged in a radial eccentric shaft hole of the main valve body 9, the disc plate 7 is fixedly connected on the valve shaft 8 in the axial medium channel 91 of the main valve body 9, the disc plate 7 and the valve shaft 8 are eccentrically arranged in the medium channel direction of the main valve body 9, the disc plate 7 and the valve shaft 8 can swing in the axial medium channel 91 of the main valve body 9 around the central line of the valve shaft 8, and the sealing matching surface of the metal sealing ring 4 and the metal valve seat 3 on the disc plate 7 is at the eccentric position of the valve shaft 8; the upper end of the valve shaft 8 is connected with an actuator 12, the upper part of the main valve body 9 is connected with an upper valve cover 11, the actuator 12 is fixed on the upper valve cover 11, the lower part of the main valve body 9 is provided with a valve shaft cover 13 in a sealing way, and the metal sealing pair double-floating mechanism is arranged below: the metal valve seat 3 is arranged between the main valve body 9 and the connecting disc 1, the metal valve seat 3 can move radially and is fixed axially relative to the main valve body 9 and the connecting disc 1, a metal sealing ring 4 is sleeved on the revolution surface of the disc 7, the metal sealing ring 4 is tightly attached to the disc 7 through a disc pressing ring 5 and an inner hexagonal socket head cap screw 6, and the metal sealing ring 4 can move radially relative to the disc 7 and the disc pressing ring 5; the actuator 12 drives the valve shaft 9 to drive the disc plate 7 and the metal sealing ring 4 to swing together, when the metal sealing ring 4 and the metal valve seat 3 are on the same side and have the same axial direction, the metal sealing ring 4 and the metal valve seat 3 float in the radial direction and then are coaxial, the metal sealing ring 4 is in sealing fit with the metal valve seat 3, and the valve is closed; when the actuator 12 drives reversely, the metal sealing ring 4 swings reversely, an included angle is formed between the metal sealing ring 4 and the metal valve seat 3 in the axial direction, the metal sealing ring and the metal valve seat 3 cannot be in sealing fit, the valve is opened, and theoretically, the valve medium passing capacity is the maximum when the metal sealing ring 4 is perpendicular to the metal valve seat 3 in the axial direction.

An O-shaped ring sealing ring groove is formed in the axial end face of one side of the metal valve seat 3, and a fluororubber O-shaped ring 2 is arranged in the sealing ring groove and used for sealing and matching the main valve body 9 and the metal valve seat 3; the connecting disc 1 is a rotary hollow body, a pipeline flange fixedly connected with the main valve body 9 is arranged on one axial end side of the connecting disc 1, a pipeline flange fixedly connected with a pipeline is arranged on the other axial end side of the connecting disc 1, and the inner diameter of a middle medium channel of the connecting disc 1 is between the inner diameter and the outer diameter of the metal valve seat 9; the end face of the main valve body 9 connected with the connecting disc 1 is provided with a metal valve seat accommodating cavity 92, the accommodating cavity 92 is coaxial with the axial medium channel 91 of the main valve body 9, the diameter of the accommodating cavity 92 is equal to the diameter of the outer axial face correspondingly matched with the metal valve seat 3 plus 1-2 mm, and a plane hermetically matched with the metal valve seat 3 is arranged in the metal valve seat accommodating cavity 92; an O-shaped ring sealing ring groove is formed in the end face, connected with the connecting disc 1, of the main valve body 9, and a fluororubber O-shaped ring 2 is arranged in the sealing ring groove and used for sealing the main valve body 9 and the connecting disc 1. The annular surface of the disk plate 7, which is in axial contact with the metal sealing ring 4, is provided with a sealing groove, a sealing gasket 10 is arranged in the sealing groove and used for sealing and matching the disk plate 7 and the metal sealing ring 4, and the sealing gasket 10 is made of polytetrafluoroethylene. The metal sealing ring 4 is made of stainless steel, and the inner diameter of the metal sealing ring 4 is equal to the sum of the axial size of the disc plate 7 matched with the metal sealing ring 4 and 1-2 mm. The metal valve seat 3 is made of stainless steel, and the inner ring surface of the metal valve seat 3 is sprayed with a hard alloy coating at high temperature, wherein the thickness of the hard alloy coating is 0.2 mm

According to the technical scheme, the three-eccentric metal sealing structure is adopted, the metal sealing ring and the metal valve seat are in floating fit, the production difficulty of the butterfly valve is reduced, particularly the processing difficulty of the metal valve seat is reduced, the problem of simple and convenient maintenance of the valve on site is solved, the maintenance period of the valve is shortened, the service life of the valve is prolonged, the use and maintenance cost of a user is saved, and the working benefit is improved.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the scope of the present invention is not to be limited by the embodiments, but only by the appended claims.

Claims

1. Two formula floating metal seal butterfly valves, including valve body, dish board, valve shaft, executor, its characterized in that: the valve body is a two-piece valve body which is formed by fixedly connecting a main valve body and a connecting disc through a fastener, the connecting disc is coaxial with the center of the main valve body, and a medium channel is arranged inside the connecting disc; still including the metal disk seat sets up between the main valve body and connection pad, the metal disk seat can radial movement and axial fixity for the main valve body and connection pad, and the cover is equipped with on the surface of revolution of dish board the metal seal ring, the dish board clamping ring for the metal seal ring leans on tightly on the dish board, the metal seal ring can radial movement for dish board and dish board clamping ring, the metal seal ring can with the sealed cooperation of metal disk seat.

2. The two-piece floating metal seal butterfly valve of claim 1, wherein: the valve shaft is rotatably arranged in a radial eccentric shaft hole of the main valve body, the disc plate is fixedly connected to the valve shaft in the axial medium channel of the main valve body, the disc plate and the valve shaft are eccentrically arranged in the direction of the medium channel of the valve body, the disc plate and the valve shaft can swing in the axial medium channel of the valve body around the central line of the valve shaft, and the sealing matching surface of the metal sealing ring and the valve seat on the disc plate is at the eccentric position of the valve shaft.

3. The two-piece floating metal seal butterfly valve of claim 2, wherein: and a sealing ring groove is arranged on the axial end face of one side of the metal valve seat, and a sealing ring is arranged in the sealing ring groove and used for sealing and matching the main valve body and the metal valve seat.

4. The two-piece floating metal seal butterfly valve of claim 3, wherein: the connecting disc is a rotary hollow body, a pipeline flange fixedly connected with the main valve body is arranged on one axial end side of the connecting disc, and a pipeline flange fixedly connected with a pipeline is arranged on the other axial end side of the connecting disc.

5. The two-piece floating metal seal butterfly valve of claim 4, wherein: the inner diameter of the connecting disc middle medium channel is between the inner diameter and the outer diameter of the metal valve seat.

6. The two-piece floating metal seal butterfly valve of claim 5, wherein: the end face of the main valve body connected with the connecting disc is provided with a metal valve seat containing cavity, the containing cavity is coaxial with the axial medium channel of the main valve body, the diameter of the containing cavity is equal to the diameter of the outer shaft face of the metal valve seat correspondingly matched with the diameter of the outer shaft face plus 1 mm to 2 mm, and a plane matched with the metal valve seat in a sealing mode is arranged in the containing cavity of the metal valve seat.

7. The two-piece floating metal seal butterfly valve of claim 6, wherein: the end face of the main valve body connected with the connecting disc is provided with a sealing ring groove, and a sealing ring is arranged in the sealing ring groove and used for sealing the main valve body and the connecting disc.

8. The two-piece floating metal seal butterfly valve of any of claims 1 to 7, wherein: the sealing device is characterized in that a sealing groove is formed in the annular surface, axially contacted with the metal sealing ring, of the disc plate, and a sealing gasket is arranged in the sealing groove and used for sealing and matching the disc plate and the metal sealing ring.

9. The two-piece floating metal seal butterfly valve of claim 8, wherein: the inner diameter of the metal sealing ring is equal to the size of the shaft matched with the disc plate and the metal sealing ring plus 1-2 mm.

10. The two-piece floating metal seal butterfly valve of claim 9, wherein: and a hard alloy coating is arranged on the inner ring surface of the metal valve seat, and the thickness of the hard alloy coating is 0.2 mm.