Valve seat sealing structure of bidirectional sealing track ball valve

Abstract

The utility model relates to a valve seat sealing structure of a two-way sealing track ball valve, the two-way sealing track ball valve comprises a valve body, a ball body arranged on the inner side of the valve body and a valve seat arranged between the valve body and the ball body, the valve seat sealing structure is sleeved on the valve seat, the valve seat is in a step shape, and a protrusion is arranged at the end, close to the ball body, of the valve seat along the circumferential direction; the valve seat sealing structure comprises a first pre-tightening assembly and a second pre-tightening assembly, the second pre-tightening assembly is arranged on the side, away from the ball, of the valve seat The first sealing ring and the second sealing ring are arranged at the abutting part of the ball body and the valve seat; a first end outlet of the sealing performance detection through hole is formed in the valve seat and arranged between the first sealing ring and the second sealing ring, and a second end outlet of the sealing performance detection through hole right faces an observation opening formed in the valve body. Compared with the prior art, the ball valve has the advantages that the valve seat is designed into a floating spring pre-tightening form, so that the spring pushes the valve seat to be pre-tightened and sealed with the ball body in a reverse pressure state of the valve, and the problem that bidirectional sealing cannot be realized due to a single valve seat of an existing track ball valve is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of track ball valves, in particular to a valve seat sealing structure of a bidirectional sealing track ball valve. Background Art

[0002] The track ball valve is a ball valve with a special structure. Because it has no friction during the opening and closing process under harsh working conditions of very high or very low temperatures, and can still ensure the reliability of sealing, it is increasingly widely used in the chemical field, especially in situations where rapid switching and alternating high and low temperatures are required.

[0003] The existing track ball valves need to meet the bidirectional sealing requirements on the low-temperature long-distance natural gas pipeline. However, it is difficult for the current track ball valves to achieve bidirectional full pressure differential sealing when reverse high pressure occurs, especially for high-pressure and large-diameter track ball valves. Since the track ball valve is a metal forced seal, there is no compensation for the ball and seat sealing surfaces. When the traditional structure track ball valve needs to be reversely sealed, once the valve stem is deformed, the ball and seat sealing surfaces will be separated, resulting in seal failure. The design requires very high bearing capacity of the valve stem, which will increase the valve thrust torque, make the stress-bearing parts of the transmission chain easily damaged, and increase the valve manufacturing cost. Utility Model Content

[0004] The purpose of the utility model is to provide a valve seat sealing structure of a bidirectional sealing track ball valve in order to overcome at least one of the defects of the prior art.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A valve seat sealing structure of a two-way sealed track ball valve, the two-way sealed track ball valve comprising a valve body, a ball body arranged inside the valve body, and a valve seat arranged between the valve body and the ball body, the valve seat sealing structure is sleeved on the valve seat, the valve seat is stepped, and a protrusion is arranged on the end near the ball body along the circumferential direction;

[0007] The valve seat sealing structure includes:

[0008] A first pre-tightening component disposed on the side of the protrusion facing the spherical body;

[0009] A second pre-tightening component disposed on the side of the valve seat facing away from the ball;

[0010] A first sealing ring and a second sealing ring are arranged at the abutment between the ball and the valve seat;

[0011] The sealing detection through hole is arranged on the valve seat, and its first end outlet is arranged between the first sealing ring and the second sealing ring, and its second end outlet is directly opposite to the observation port arranged on the valve body.

[0012] Furthermore, the first pre-tightening assembly includes a valve seat pressing ring arranged on the side of the protrusion facing the spherical body, and a screw arranged in the valve seat pressing ring, and the screw is screwed into the valve body.

[0013] Furthermore, there are multiple screws and they are arranged on the valve seat pressing ring along the circumference of the valve seat pressing ring.

[0014] Furthermore, the second pre-tightening assembly includes a spring seat arranged at an end of the valve seat away from the spherical body, and a spring abutting against the valve body is arranged in the spring seat.

[0015] Furthermore, the spring is a cylindrical spring.

[0016] Furthermore, there are multiple spring seats evenly distributed on the end surface of the valve seat facing away from the spherical body.

[0017] Furthermore, third sealing rings sleeved on the valve seat are symmetrically arranged on both sides of the outlet of the second end of the sealing detection through hole.

[0018] Furthermore, the outer wall of the valve seat is provided with an outer groove for accommodating the third sealing ring.

[0019] Furthermore, the third sealing ring is an O-ring.

[0020] Furthermore, the outlet of the second end of the sealing detection through hole abuts against and is communicated with an observation port arranged on the valve body.

[0021] Compared with the prior art, the utility model has the following advantages:

[0022] (1) The utility model provides a valve seat sealing structure of a two-way sealing track ball valve. By designing the valve seat into a floating spring pre-tightening form, the spring pushes the valve seat and the ball to pre-tighten the seal under the reverse pressure state of the valve, thereby solving the problem that the existing track ball valve cannot achieve two-way sealing due to the single valve seat.

[0023] (2) The utility model provides a valve seat sealing structure of a bidirectional sealed track ball valve, wherein a sealing detection through hole is arranged on the valve seat, a first end outlet of the sealing detection through hole is arranged between a first sealing ring and a second sealing ring, and a second end outlet is directly opposite to an observation port arranged on the valve body. Furthermore, the second end outlet of the sealing detection through hole is abutted against and connected to the observation port arranged on the valve body, and the sealing condition between the ball and the valve seat can be detected through the observation port. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front view of a bidirectional sealing track ball valve in the embodiment;

[0025] Figure 2 A top view of a bidirectional sealing track ball valve in an embodiment;

[0026] Figure 3 for Figure 2 A partial enlarged view of the middle A area;

[0027] As shown in the figure: 1-first sealing ring; 2-second sealing ring; 3-screw; 4-valve seat pressure ring; 5-valve seat; 6-third sealing ring; 7-spring seat; 8-spring; 9-ball; 10-valve body; 11-sealing detection hole; 12-observation port. DETAILED DESCRIPTION

[0028] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0029] Example

[0030] See also Figure 1-3 A valve seat sealing structure of a two-way sealed track ball valve, the two-way sealed track ball valve comprises a valve body 10, a ball 9 arranged inside the valve body 10, and a valve seat 5 arranged between the valve body 10 and the ball 9, the valve seat sealing structure is sleeved on the valve seat 5, the valve seat 5 is stepped, and a protrusion is arranged on the end near the ball along the circumferential direction;

[0031] The valve seat sealing structure includes: a first pre-tightening component arranged on the side of the protrusion facing the ball; a second pre-tightening component arranged on the side of the valve seat 5 away from the ball 9; a first sealing ring 1 and a second sealing ring 2 arranged at the abutment between the ball 9 and the valve seat 5; a sealing detection through hole 11 opened on the valve seat 5, a first end outlet of which is arranged between the first sealing ring 1 and the second sealing ring 2, and a second end outlet is opposite to the observation port 12 arranged on the valve body 10. Specifically, the second end outlet of the sealing detection through hole 11 abuts against and is connected with the observation port 12 arranged on the valve body 10.

[0032] In this embodiment, the first pre-tightening assembly includes a valve seat pressing ring 4 disposed on the side of the protrusion facing the ball, and a screw 3 disposed in the valve seat pressing ring 4, and the screw 3 is screwed into the valve body 10. There are multiple screws 3 and they are arranged on the valve seat pressing ring 4 along the circumference of the valve seat pressing ring 4.

[0033] In this embodiment, the second preload assembly includes a spring seat 7 disposed at the end of the valve seat 5 away from the ball 9, and a spring 8 is disposed in the spring seat 7 to abut against the valve body 10. The spring 8 is a cylindrical spring. There are multiple spring seats 7 that are evenly distributed on the end surface of the valve seat 5 away from the ball 9.

[0034] In this embodiment, the third sealing ring 6 sleeved on the valve seat 5 is symmetrically arranged on both sides of the second end outlet of the sealing detection through hole 11. The outer wall of the valve seat 5 is provided with an outer groove for accommodating the third sealing ring 6. The third sealing ring 6 is an O-ring.

[0035] The valve seat sealing structure of this embodiment designs the valve seat into a floating spring pre-tightening form, so that the spring 8 pushes the valve seat 5 and the ball 9 to pre-tighten the seal under the reverse pressure state of the valve, which changes the existing track ball valve that cannot achieve bidirectional sealing due to the single valve seat. In addition, the first end outlet of the sealing detection through hole 11 provided on the valve seat 5 is provided between the first sealing ring 1 and the second sealing ring 2, and the second end outlet is directly opposite to the observation port 12 provided on the valve body 10, through which the sealing condition between the ball 9 and the valve seat 5 can be detected.

[0036] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A valve seat sealing structure of a two-way sealed track ball valve, the two-way sealed track ball valve comprising a valve body (10), a ball (9) arranged inside the valve body (10), and a valve seat (5) arranged between the valve body (10) and the ball (9), the valve seat sealing structure being sleeved on the valve seat (5), characterized in that: The valve seat (5) is stepped, and a protrusion is provided on the end near the sphere along the circumferential direction; The valve seat sealing structure includes: A first pre-tightening component disposed on the side of the protrusion facing the spherical body; A second pre-tightening component arranged on a side of the valve seat (5) facing away from the ball (9); A first sealing ring (1) and a second sealing ring (2) arranged at the abutment portion between the ball (9) and the valve seat (5); A sealing detection through hole (11) is provided on the valve seat (5), wherein a first end outlet is arranged between the first sealing ring (1) and the second sealing ring (2), and a second end outlet is directly opposite to an observation port (12) provided on the valve body (10).

2. The valve seat sealing structure of a bidirectional sealing track ball valve according to claim 1, characterized in that: The first pre-tightening assembly comprises a valve seat pressing ring (4) arranged on the side of the protrusion facing the ball, and a screw (3) arranged in the valve seat pressing ring (4), wherein the screw (3) is screwed into the valve body (10).

3. The valve seat sealing structure of a bidirectional sealing track ball valve according to claim 2, characterized in that: There are a plurality of screws (3) which are arranged on the valve seat pressing ring (4) along the circumference of the valve seat pressing ring (4).

4. The valve seat sealing structure of a bidirectional sealing track ball valve according to claim 1, characterized in that: The second pre-tightening assembly comprises a spring seat (7) arranged at an end of the valve seat (5) facing away from the ball (9), and a spring (8) abutting against the valve body (10) is arranged in the spring seat (7).

5. The valve seat sealing structure of a bidirectional sealing track ball valve according to claim 4, characterized in that: The spring (8) is a cylindrical spring.

6. The valve seat sealing structure of a bidirectional sealing track ball valve according to claim 4, characterized in that: There are multiple spring seats (7) which are evenly distributed on the end surface of the valve seat (5) facing away from the spherical body (9).

7. The valve seat sealing structure of a bidirectional sealing track ball valve according to claim 1, characterized in that: A third sealing ring (6) sleeved on the valve seat (5) is symmetrically arranged on both sides of the second end outlet of the sealing detection through hole (11).

8. The valve seat sealing structure of a bidirectional sealing track ball valve according to claim 7, characterized in that: The outer wall of the valve seat (5) is provided with an outer groove for accommodating the third sealing ring (6).

9. The valve seat sealing structure of a bidirectional sealing track ball valve according to claim 7, characterized in that: The third sealing ring (6) is an O-ring.

10. The valve seat sealing structure of a bidirectional sealing track ball valve according to claim 1, characterized in that: The outlet at the second end of the sealing detection through hole (11) abuts against and is in communication with an observation port (12) provided on the valve body (10).

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