CN212107001U - Fixed forged steel ball valve - Google Patents

Abstract

The utility model provides a fixed forged steel ball valve, which comprises a valve body, a valve seat component, a valve ball and a valve rod, wherein the valve ball is arranged in the valve body through the valve rod, and medium buffer cavities are respectively reserved between the upper end surface and the lower end surface of the valve ball and the valve body; the valve seat assembly is respectively arranged on the left side and the right side of the valve ball in the valve body and comprises an annular valve seat and a spring, a discharge gap communicated with the medium buffer cavity can be formed between the inner side wall of the annular valve seat and the valve ball, and the annular valve seat can translate to seal the discharge gap; a plurality of spring grooves distributed on the circumference which is coaxial with the annular valve seat are arranged in the valve body, the springs are positioned in the spring grooves, and the left end and the right end of each spring groove are respectively connected with the annular valve seat; the annular valve seat is provided with a pressed end face extending into the main flow passage of the valve body, and the pressed end face is positioned on one side of the annular valve seat, which is far away from the valve ball, and is perpendicular to the main flow passage direction of the valve body. The utility model discloses a sealing performance of disk seat between to valve ball and valve body is reliable and stable.

Description

Fixed forged steel ball valve

Technical Field

The utility model belongs to the technical field of the valve, concretely relates to fixed forged steel ball valve.

Background

The fixed forged steel ball valve is widely applied to the industries of chemical industry, petroleum, metallurgy, natural gas and the like, is arranged on a medium pipeline and is used for cutting off or connecting a high-pressure medium in the pipeline. The valve ball in the fixed forged steel ball valve is relatively and fixedly arranged on the valve body, can only rotate and cannot move, and the gap between the valve ball and the valve body is sealed by the movement of the left valve seat and the right valve seat. A cavity is arranged between the top of the valve ball and the valve body, and part of high-pressure medium in the rotating process of the valve ball can enter the main flow channel after being buffered by the cavity.

The valve seat of the existing fixed ball valve sometimes shakes due to the pressure of the medium under pressure in the cavity, so that the gap between the valve ball and the valve body is difficult to be continuously and reliably sealed, and the working stability of the valve is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a fixed forged steel ball valve to solve the unstable problem of leakproofness of disk seat between to valve ball and the valve body.

The utility model provides a following technical scheme:

a fixed forged steel ball valve comprises a valve body, a valve seat assembly, a valve ball and a valve rod, wherein the valve ball is arranged in the valve body through the valve rod, and medium buffer cavities are respectively reserved between the upper end surface and the lower end surface of the valve ball and the valve body; the valve seat assembly is respectively arranged on the left side and the right side of the valve ball in the valve body and comprises an annular valve seat and a spring, a discharge gap communicated with the medium buffer cavity can be formed between the inner side wall of the annular valve seat and the valve ball, and the annular valve seat can translate towards one side of the valve ball to seal the discharge gap; a plurality of spring grooves are formed in the valve body, the spring grooves are distributed on the circumference which is coaxial with the annular valve seat, the opening of each spring groove faces one side of the valve ball, the spring is positioned in the spring groove, and the left end and the right end of the spring are fixedly connected with the spring groove and the annular valve seat respectively; the annular valve seat is provided with a pressed end face extending into the main runner of the valve body, and the pressed end face is located on the annular valve seat, away from one side of the valve ball and perpendicular to the main runner direction of the valve body.

Preferably, the annular valve seat is provided with a material discharge pressure bearing surface, and the material discharge pressure bearing surface is positioned on one side opposite to the pressure bearing end surface and inclines towards the direction of the valve ball.

Preferably, vertical limiting surfaces are respectively arranged on the upper side and the lower side of the spring groove on the valve body, and a matching surface which can be tightly attached to the limiting surfaces is arranged on the annular valve seat.

Preferably, an annular sealing surface clinging to the inner wall of the valve body is arranged in the circumferential direction of the annular valve seat, and a sealing ring pressing the annular sealing surface is installed on the inner wall of the valve body.

Preferably, a discharge flow passage is arranged at the bottom of the valve body, and a discharge valve is installed on a pipeline connected with the discharge flow passage.

The utility model has the advantages that:

the utility model discloses install the disk seat subassembly respectively in the left and right sides of valve ball, its ring valve seat is fixed by the spring flexibility, ring valve seat's pressurized terminal surface stretches into in the sprue of valve body and perpendicular to sprue, when the valve is opened, the high pressure medium of medium entrance side exerts pressure to the ring valve seat pressurized terminal surface of this side and makes it extrude the valve ball to valve ball one side, thereby the sealed blowdown clearance more reliably, the medium that blocks the entrance side gets into the medium cushion chamber, the ring valve seat of exit side this moment keeps away from the valve ball under the thrust action of area pressure medium in the medium cushion chamber, the blowdown clearance that makes this side is unblocked, the area in the medium cushion chamber presses the medium to flow out the medium cushion chamber through the blowdown clearance fast.

The utility model discloses an in the pressurized end face stretched into the sprue, high-pressure medium in the sprue can extrude annular disk seat to disk seat one side steadily to sealed unloading clearance more reliably, the spring of having avoided the medium entrance side receives the pressure of medium in the medium cushion chamber and presses the backpressure of medium and produce the disk seat and rock, has improved the sealing performance between annular disk seat and the valve ball, has guaranteed the stability of valve work.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view of the internal structure of the present invention;

fig. 2 is an enlarged schematic structural view of a portion a in fig. 1 according to the present invention;

fig. 3 is an enlarged schematic structural view of a portion B in fig. 1 according to the present invention;

labeled as: 1. a valve body; 2. a valve ball; 3. a valve stem; 4. a fluid channel; 5. a main channel; 6. a media buffer chamber; 7. an annular valve seat; 8. a spring; 9. a discharge gap; 10. a spring slot; 11. a compression end face; 12. a material discharge pressure bearing surface; 13. a limiting surface; 14. a mating surface; 15. a seal ring; 16. a discharge flow passage; 17. and a discharge valve.

Detailed Description

As shown in fig. 1, the embodiment provides a fixed forged steel ball valve, which is a two-way valve and comprises a valve body 1, a valve seat assembly, a valve ball 2 and a valve rod 3, wherein the valve body 1, the valve ball 2 and the valve rod 3 are made of forged steel, the valve ball 2 is installed in the valve body 1 through the valve rod 3, a fluid passage 4 communicated with a main passage 5 of the valve body is arranged in the valve ball 2, and the valve rod 3 drives the valve ball 2 to rotate so as to connect or disconnect the main passage 5 of the valve body with the fluid passage 4, thereby realizing the opening or closing of the valve.

A medium buffer cavity 6 is respectively reserved between the upper end face and the lower end face of the valve ball 2 and the valve body 1, and in the rotating process of the valve ball 2, namely in the process of opening and closing the valve, part of high-pressure medium firstly flows into the medium buffer cavity 6 and then flows out of the valve body 1 from the medium buffer cavity 6 to the outlet side.

As shown in fig. 1 to 3, valve seat assemblies are respectively installed on the left and right sides of the valve ball 2 in the valve body 1, each valve seat assembly includes an annular valve seat 7 and a spring 8, a discharge gap 9 communicating with the medium buffer chamber 6 can be formed between the inner side wall of the annular valve seat 7 and the valve ball 2, and when the valve is closed, the springs 8 on the left and right sides can press the annular valve seat 7 toward the valve ball 2 to seal the discharge gap 9.

Be equipped with a plurality of spring groove 10 in the valve body 1, a plurality of spring groove 10 distributes on the circumference with annular valve seat 7 coaxial, and the opening of spring groove 10 is towards valve ball 2 one side, and spring 8 is located spring groove 10 and spring 8's the left and right sides both ends respectively fixed connection spring groove 10 and annular valve seat 7, and spring 8 can exert pressure to annular valve seat 7 to valve ball 2 one side.

The annular valve seat 7 is provided with a pressed end face 11 extending into the main runner 5 of the valve body, the pressed end face 11 is positioned on the annular valve seat 7 and is far away from one side of the valve ball 2 and perpendicular to the main runner direction of the valve body, therefore, when the valve is opened, the pressed end face 11 is extruded by a high-pressure medium at the inlet side, the inner side wall of the annular valve seat 7 is always tightly attached to the surface of the valve ball 2, even if the spring 8 is subjected to the reverse pressure of the medium under pressure in the medium buffer cavity 6 to generate a shaking trend, the annular valve seat 7 cannot be separated from the surface of the valve ball 2, the tightness of a discharging gap is ensured, therefore, the high-pressure medium can rapidly flow out of the valve body 1 through the fluid channel 4 of the valve ball, the situation that the high-pressure medium enters the medium buffer cavity 6 to generate.

The annular valve seat 7 is further provided with a material discharge pressure bearing surface 12, and the material discharge pressure bearing surface 12 is located on the side opposite to the pressure bearing end surface 11 and is inclined towards the valve ball 2. After the valve is opened, the pressure of the medium under pressure in the medium buffer cavity 6 can be more effectively received and the spring 8 is extruded due to the inclined arrangement of the material discharge pressure bearing surface 12 of the outlet-side annular valve seat, so that the material discharge gap 9 is rapidly formed between the annular valve seat 7 and the valve ball 2, and the medium under pressure flows out of the medium buffer cavity 6 through the material discharge gap 9.

Vertical limiting surfaces 13 are respectively arranged on the upper side and the lower side of the spring groove 10 on the valve body 1, a matching surface 14 which can be tightly attached to the limiting surfaces 13 is arranged on the annular valve seat 7, and the limiting surfaces 13 and the matching surface 14 can limit the moving stroke of the annular valve seat 7, so that the discharging gap 9 between the annular valve seat 7 and the valve ball 2 keeps a stable width.

The circumferential direction of the annular valve seat 7 is provided with an annular sealing surface tightly attached to the inner wall of the valve body, the inner wall of the valve body 1 is provided with a sealing ring 15 for compressing the annular sealing surface, the sealing ring 15 further improves the sealing property between the valve body 1 and the annular valve seat 7, and a medium is prevented from entering the medium buffer cavity 6 from a gap between the valve body 1 and the annular valve seat.

The bottom of the valve body 1 is provided with a discharge flow passage 16, a discharge valve 17 is installed on a pipeline connected with the discharge flow passage 16, and when the pressure of the residual medium in the medium buffer chamber 6 is small and cannot be discharged from the discharge gap, the discharge valve 17 can be opened to discharge the residual medium in the medium buffer chamber 6.

The working principle of the fixed forged steel ball valve is as follows:

in the process of switching the valve from opening to closing, the valve ball 2 rotates to be separated from the annular valve seat 7 for a short time, so that part of high-pressure medium enters the medium buffer cavity 6, the medium with pressure in the medium buffer cavity 6 extrudes the annular valve seat 7 and the spring 8 at the outlet side, the side forms a discharge gap 9, and then the medium buffer cavity 6 flows out of the discharge gap 9; at the moment, the high-pressure medium on the inner inlet side of the valve body 1 extrudes the pressed end face 11 of the annular valve seat, so that the annular valve seat 7 is firmly attached to the valve ball 2, the high-pressure medium is prevented from entering the medium buffer cavity 6, meanwhile, the annular valve seat 7 cannot be separated from the surface of the valve ball 2 due to the reverse pressure of the medium with pressure in the medium buffer cavity 6 on the annular valve seat 7, and the sealing effect of valve closing is ensured.

In the process of opening the valve, part of high-pressure medium enters the medium buffer cavity 6 and then flows out from the discharge gap 9 on the outlet side; after the valve is completely opened, the high-pressure medium on the inlet side always presses the pressed end face 11 of the annular valve seat, so that the high-pressure medium is prevented from continuously flowing out through the medium buffer cavity 6, and the working stability of the valve ball is ensured.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. A fixed forged steel ball valve is characterized by comprising a valve body, a valve seat assembly, a valve ball and a valve rod, wherein the valve ball is arranged in the valve body through the valve rod, and medium buffer cavities are respectively reserved between the upper end surface and the lower end surface of the valve ball and the valve body; the valve seat assembly is respectively arranged on the left side and the right side of the valve ball in the valve body and comprises an annular valve seat and a spring, a discharge gap communicated with the medium buffer cavity can be formed between the inner side wall of the annular valve seat and the valve ball, and the annular valve seat can translate towards one side of the valve ball to seal the discharge gap; a plurality of spring grooves are formed in the valve body, the spring grooves are distributed on the circumference which is coaxial with the annular valve seat, the opening of each spring groove faces one side of the valve ball, the spring is positioned in the spring groove, and the left end and the right end of the spring are fixedly connected with the spring groove and the annular valve seat respectively; the annular valve seat is provided with a pressed end face extending into the main runner of the valve body, and the pressed end face is located on the annular valve seat, away from one side of the valve ball and perpendicular to the main runner direction of the valve body.

2. The fixed forged steel ball valve of claim 1, wherein said annular valve seat is provided with a discharge pressure bearing face located on a side opposite to said pressure end face and inclined in a direction of said valve ball.

3. The fixed forged steel ball valve according to claim 2, wherein vertical limiting surfaces are respectively provided on the upper and lower sides of the spring groove on the valve body, and a fitting surface against which the limiting surfaces can be fitted is provided on the annular valve seat.

4. The fixed forged steel ball valve according to claim 3, wherein an annular sealing surface is provided on the annular valve seat in a circumferential direction to be closely attached to the inner wall of the valve body, and a sealing ring is provided on the inner wall of the valve body to press the annular sealing surface.

5. The fixed forged steel ball valve according to any one of claims 1 to 4, wherein a drain runner is provided at the bottom of said valve body, and a drain valve is installed on a pipe connected to said drain runner.

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