CN210770307U

CN210770307U - Hard-sealing double-eccentric butterfly valve with high-pressure valve seat

Info

Publication number: CN210770307U
Application number: CN201921917714.3U
Authority: CN
Inventors: 王铨; 王勇星
Original assignee: Wuxi Kelk Apparatus & Valve Co ltd
Current assignee: Wuxi Kelk Apparatus & Valve Co ltd
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2020-06-16
Anticipated expiration: 2029-11-08

Abstract

The utility model provides a high pressure disk seat seals double eccentric butterfly valve firmly, it can solve the sealed very big magnitude of interference that needs between disk seat and the butterfly plate of current conventional double eccentric butterfly valve, can only lean on hard extrusion to realize effectual sealed, and the moment of torsion power that needs actuating mechanism output is very big, and this structure is not suitable for the problem of high pressure environment moreover. The butterfly valve comprises a valve body, a valve rod, a valve seat, a butterfly plate and an insert, wherein the valve rod is rotatably arranged in the valve body, the upper end of the valve rod is sealed with the valve body through a packing box, the butterfly plate is fixed on the valve rod, and the valve seat is pressed on the valve body through the insert; the metal pressing ring is arranged in the pressing ring mounting groove, threaded holes communicated with the pressing ring mounting groove are further processed in the insert at intervals along the circumferential direction of the insert, and the inner hexagonal flat end holding screw is arranged in the threaded holes and used for pressing the metal pressing ring.

Description

Hard-sealing double-eccentric butterfly valve with high-pressure valve seat

Technical Field

The utility model relates to a double-eccentric butterfly valve field specifically is a high pressure disk seat seals double-eccentric butterfly valve firmly.

Background

The double-eccentric butterfly valve is also called as a high-performance butterfly valve, is mainly suitable for drainage of systems such as water plants, power plants, steel plant smelting, chemical engineering, water source spring engineering, environmental facility construction and the like, is particularly suitable for water pipelines, and is used as regulating and intercepting equipment. Compared with a center line butterfly valve, the double-eccentric butterfly valve is more resistant to high pressure, longer in service life and good in stability.

Fig. 1 is a front sectional view of a conventional double eccentric butterfly valve, and fig. 2 is an enlarged view of a region a of fig. 1. The conventional double-eccentric butterfly valve mainly comprises a valve body 1, a valve rod 2, a valve seat 3, a butterfly plate 4 and an insert 5, wherein the valve rod is rotatably installed in the valve body, the upper end of the valve rod is sealed with the valve body through a packing box, the butterfly plate is fixed on the valve rod, the valve seat is pressed on the valve body through the insert, an executing mechanism provides output torque, the valve rod is driven to rotate, the valve rod further drives the butterfly plate to rotate, the sealing surface of the butterfly plate extrudes the valve seat, and the sealing of the valve. However, in the conventional structure, the sealing between the valve seat and the butterfly plate needs a large interference, effective sealing can be realized only by hard extrusion, the torque force output by the actuating mechanism is required to be large, and the structure can only be used in a low-to-medium pressure environment, and once the structure is used in a high-pressure environment, the requirements of the torque force and the sealing property cannot be met.

Disclosure of Invention

The sealed very big magnitude of interference that needs between disk seat and the butterfly plate to current conventional double-eccentric butterfly valve can only rely on hard extrusion to realize effectual sealing, and the moment of torsion that needs actuating mechanism output is very big, and this structure is not suitable for the technical problem in high pressure environment moreover, the utility model provides a high pressure disk seat seals double-eccentric butterfly valve firmly, its disk seat adopts the design of autogenous pressure type, enables to reach the best sealed effect between disk seat and the butterfly plate to reach minimum operating torque, be applicable to high pressure environment.

The technical scheme is as follows: a high-pressure valve seat hard sealing double-eccentric butterfly valve comprises a valve body, a valve rod, a valve seat, a butterfly plate and an insert, wherein the valve rod is rotatably arranged in the valve body, the upper end of the valve rod is sealed with the valve body through a packing box, the butterfly plate is fixed on the valve rod, and the valve seat is pressed on the valve body through the insert; the method is characterized in that: the metal pressing ring is mounted in the pressing ring mounting groove, threaded holes communicated with the pressing ring mounting groove are further formed in the insert at intervals along the circumferential direction of the insert, and the inner hexagonal flat end set screws are mounted in the threaded holes and used for tightly pressing the metal pressing ring.

It is further characterized in that:

the threaded holes are uniformly distributed along the circumferential direction of the insert.

And two hexagon socket flat-end fastening screws are vertically arranged in each threaded hole.

The valve seat comprises a metal circular ring and a metal O-shaped ring, the metal O-shaped ring is fixedly welded on the bottom surface of the metal circular ring and is close to one side of an inner hole of the metal circular ring, and the sealing surface of the butterfly plate can extrude the side wall of the metal O-shaped ring to realize sealing; keep away from of metal ring hole one side by the inserts pressure equipment is in on the valve body, the metal clamping ring is pressed be close to of metal ring on the top surface of hole one side, metal O type circle towards one side of valve body medium is followed its circumference interval and is opened there is the through-hole.

The through holes are uniformly distributed along the circumferential direction of the metal O-shaped ring.

And a sealing ring is arranged between the valve body and the valve seat.

And two ends of the valve rod are rotatably installed with the valve body through shaft sleeves respectively.

The stuffing box comprises a stuffing gasket, formed stuffing and a stuffing pressing ring which are sequentially arranged from inside to outside of the valve body, wherein the stuffing pressing ring is pressed by a stuffing pressing cover, and the stuffing pressing cover is fixed on the valve body through a bolt.

The lower end of the valve rod is provided with an annular boss, the part of the valve rod corresponding to the packing pressing ring is provided with a groove along the circumferential direction, and a bushing is arranged between the groove and the packing pressing ring.

And the bottom plug is arranged in the valve body and is welded on the valve body.

The utility model has the advantages that:

the utility model discloses a double eccentric butterfly valve, through installing metal clamping ring and hexagon socket head cap end holding screw additional, thereby accessible hexagon socket head cap end holding screw applys even pressure to the metal clamping ring, and then applys even pressure to the disk seat, can adjust the sealing performance of disk seat, let the disk seat make sealing performance more reliable under medium and metal clamping ring dual pressure, can reduce the magnitude of interference requirement between disk seat and the butterfly plate simultaneously, and then compromise operating torque and sealed effect, use under being applicable to the high pressure environment.

Drawings

FIG. 1 is a front sectional view of a conventional double eccentric butterfly valve;

FIG. 2 is an enlarged view of area A of FIG. 1;

fig. 3 is a main sectional view of the present invention;

fig. 4 is an enlarged view of the region B in fig. 3.

Reference numerals: 1-a valve body; 2-a valve stem; 3-valve seat; 4-a butterfly plate; 5-an insert; 6-shaft sleeve; 7-cylindrical pins; 8-metal pressing ring; 9-a flat end fastening screw of an inner hexagon; 10-pressing ring mounting groove; 11-a threaded hole; 12-a sealing ring; 13-a packing pad; 14-a shaped filler; 15-packing and pressing a ring; 16-a packing gland; 17-a bolt; 18-an annular boss; 19-a groove; 20-a liner; 21-bottom plug; 31-a metal ring; 32-metal O-rings; 33-through holes.

Detailed Description

Referring to fig. 3 to 4, the utility model discloses a high pressure valve seat hard seal double eccentric butterfly valve, it includes valve body 1, valve rod 2, valve seat 3, butterfly plate 4 and inserts 5, the both ends of valve rod 2 are installed in valve body 1 through axle sleeve 6 rotation and the upper end of valve rod 2 is sealed with valve body 1 through packing box, butterfly plate 4 is fixed on valve rod 2 through cylindric lock 7, valve seat 3 is on valve body 1 by the pressure equipment of inserts 5, install sealing ring 12 between valve body 1 and the valve seat 3; it still includes metal clamping ring 8 and hexagon socket head cap end holding screw 9, and the last one side that is close to disk seat 3 of inserts 5 is processed the clamping ring mounting groove, and metal clamping ring 8 is installed in clamping ring mounting groove 10, and it has the screw hole 11 with clamping ring mounting groove 10 intercommunication still to process at even interval along its circumference on inserts 5, and hexagon socket head cap end holding screw 9 is installed and is used for compressing tightly metal clamping ring 8 in screw hole 11.

See fig. 4, all install two hexagon socket head cap end holding screw 9 from top to bottom in every screw hole 11, the hexagon socket head cap end holding screw that is located the below is used for providing pressure to the metal clamping ring, and the hexagon socket head cap end holding screw that is located the top is used for preventing the hexagon socket head cap end holding screw of below from flying out under high pressure, plays the safety insurance effect.

Referring to fig. 4, the valve seat 3 includes a metal ring 31 and a metal O-ring 32, the metal O-ring 32 is welded and fixed on the bottom surface of the metal ring 31 and is close to one side of an inner hole of the metal ring 31, and a sealing surface of the butterfly plate 4 can press the side wall of the metal O-ring 32 to realize sealing; one side of the metal ring 31, which is far away from the inner hole, is pressed on the valve body 1 through the insert 5, the metal pressing ring 8 is pressed on the top surface of the metal ring 31, which is close to the inner hole, and through holes 33 are uniformly distributed at intervals along the circumferential direction on one side of the metal O-shaped ring 32, which faces to the medium in the valve body 1. So design, because the through-hole on the metal O type circle is towards the medium, so the medium can be full of inside the metal O type circle by the through-hole to metal O type circle internal pressure can increase along with outside medium pressure increase, in order to reach pressure balance, not only can reduce the pipe wall deformation that metal O type circle takes place under the high pressure, moreover at high pressure a small amount of inflation of metal O type circle self can further improve the leakproofness, make the valve be applicable to high pressure environment more.

Referring to fig. 3, the stuffing box comprises a stuffing gasket 13, a formed stuffing 14 and a stuffing pressing ring 15 which are sequentially arranged from inside to outside of the valve body 1, the stuffing pressing ring 15 is pressed by a stuffing pressing cover 16, and the stuffing pressing cover 16 is fixed on the valve body 1 through a bolt 17. The design is simple in structure and convenient to install and maintain.

Referring to fig. 3, the lower end of the valve rod 2 is provided with an annular boss 18, a groove 19 is formed on the part of the valve rod 2 corresponding to the packing pressing ring 15 along the circumferential direction, and a bushing 20 is arranged between the groove 19 and the packing pressing ring 15. The annular boss and the bushing are designed for preventing the valve rod from blowing off, so that safety accidents caused by the fact that the valve rod flies out due to medium pressure in the valve body when the valve rod is broken can be prevented, and the safety performance of the whole valve is improved.

Referring to fig. 3, a bottom plug 21 is further installed in the valve body 1 at the lower end of the valve rod 2, and the bottom plug 21 is welded to the valve body 1. Because the annular boss is processed on the valve rod, the valve rod needs to be penetrated by the lower end of the valve body, and the bottom plug can seal the lower end of the valve body after the valve rod penetrates into the valve body, so that the bottom of the valve is sealed.

Claims

1. A high-pressure valve seat hard sealing double-eccentric butterfly valve comprises a valve body, a valve rod, a valve seat, a butterfly plate and an insert, wherein the valve rod is rotatably arranged in the valve body, the upper end of the valve rod is sealed with the valve body through a packing box, the butterfly plate is fixed on the valve rod, and the valve seat is pressed on the valve body through the insert; the method is characterized in that: the metal pressing ring is mounted in the pressing ring mounting groove, threaded holes communicated with the pressing ring mounting groove are further formed in the insert at intervals along the circumferential direction of the insert, and the inner hexagonal flat end set screws are mounted in the threaded holes and used for tightly pressing the metal pressing ring.

2. The high pressure valve seat hard seal double eccentric butterfly valve of claim 1, wherein: the threaded holes are uniformly distributed along the circumferential direction of the insert.

3. A high pressure valve seat hard seal double offset butterfly valve according to claim 1 or 2, wherein: and two hexagon socket flat-end fastening screws are vertically arranged in each threaded hole.

4. The high pressure valve seat hard seal double eccentric butterfly valve of claim 1, wherein: the valve seat comprises a metal circular ring and a metal O-shaped ring, the metal O-shaped ring is fixedly welded on the bottom surface of the metal circular ring and is close to one side of an inner hole of the metal circular ring, and the sealing surface of the butterfly plate can extrude the side wall of the metal O-shaped ring to realize sealing; keep away from of metal ring hole one side by the inserts pressure equipment is in on the valve body, the metal clamping ring is pressed be close to of metal ring on the top surface of hole one side, metal O type circle towards one side of valve body medium is followed its circumference interval and is opened there is the through-hole.

5. The high pressure valve seat hard seal double eccentric butterfly valve of claim 4, wherein: the through holes are uniformly distributed along the circumferential direction of the metal O-shaped ring.

6. The high pressure valve seat hard seal double eccentric butterfly valve of claim 1, wherein: and a sealing ring is arranged between the valve body and the valve seat.

7. The high pressure valve seat hard seal double eccentric butterfly valve of claim 1, wherein: and two ends of the valve rod are rotatably installed with the valve body through shaft sleeves respectively.

8. The high pressure valve seat hard seal double eccentric butterfly valve of claim 1, wherein: the stuffing box comprises a stuffing gasket, formed stuffing and a stuffing pressing ring which are sequentially arranged from inside to outside of the valve body, wherein the stuffing pressing ring is pressed by a stuffing pressing cover, and the stuffing pressing cover is fixed on the valve body through a bolt.

9. The high pressure valve seat hard seal double offset butterfly valve of claim 8, wherein: the lower end of the valve rod is provided with an annular boss, the part of the valve rod corresponding to the packing pressing ring is provided with a groove along the circumferential direction, and a bushing is arranged between the groove and the packing pressing ring.

10. The high pressure valve seat hard seal double offset butterfly valve of claim 9, wherein: and the bottom plug is arranged in the valve body and is welded on the valve body.