Dual seal ball valve

Abstract

The application discloses a double-channel sealing compensation ball valve, which comprises a main valve body, a ball body, a left sealing cabin and a right sealing cabin; the ball body is arranged in the main valve body; the left sealing cabin is arranged on the left side of the main valve body, a fluid passage is arranged in the middle of the left sealing cabin, a left main sealing ring for sealing the ball body is arranged on the inner side of the left sealing cabin around the fluid passage, a left outer gasket, a left O-shaped sealing ring and a left inner gasket are arranged in a region between the left main sealing ring and the left sealing cabin, and the left O-shaped sealing ring is located between the left outer gasket and the left inner gasket; the right side of the ball body is also provided with the corresponding structure. When the main sealing ring is worn to form a gap, the outer gasket, the sealing O-shaped ring and the inner gasket assembly between the upstream main sealing ring and the side sealing cabin play a bidirectional self-sealing role of a piston, and automatically compensate the sealing; the application has good sealing effect and low manufacturing cost.

Description

Technical Field

[0001] This invention relates to the field of pipeline fluid control valve technology, specifically to a double-seal compensating ball valve. Background Technology

[0002] Existing floating ball valves have simple seat designs, typically using a single circular sealing ring for direct compression. Under the pressure of the medium, the ball and downstream seat are tightly sealed. However, with frequent opening and closing or prolonged operation, wear occurs along the upstream and downstream sides of the seat, creating gaps between the ball and seat. Since existing seats lack automatic compensation, fluid leakage is likely, resulting in poor sealing performance under low pressure and a short valve lifespan. Another type, the pipe-pressure ball valve, has an excessively long body and pipes at both ends, making it impossible to achieve standardized single-seat sealing, dual-seal, or bidirectional automatic sealing functions. Summary of the Invention

[0003] This invention provides a dual-seal compensation ball valve, one of the technical problems it aims to solve: existing floating ball valves are prone to fluid leakage and poor sealing performance due to wear caused by prolonged use.

[0004] In view of the above-mentioned problems of the prior art, according to one aspect disclosed in this invention, the present invention adopts the following technical solution:

[0005] A double-seal compensating ball valve, comprising:

[0006] Main valve body;

[0007] A sphere, which is disposed within the main valve body;

[0008] A left sealing chamber is provided on the left side of the main valve body. A fluid channel is provided in the middle of the left sealing chamber. A left main sealing ring for sealing the ball is provided on the inner side of the left sealing chamber around the fluid channel. A left outer gasket, a left O-ring and a left inner gasket are provided in an area between the left main sealing ring and the left sealing chamber. The left O-ring is located between the left outer gasket and the left inner gasket.

[0009] A right-side sealing chamber is located on the right side of the main valve body. A fluid channel is provided in the middle of the right-side sealing chamber. A right main sealing ring for sealing the ball is provided on the inner side of the right-side sealing chamber around the fluid channel. A right outer gasket, a right O-ring, and a right inner gasket are provided in an area between the right main sealing ring and the right-side sealing chamber. The right O-ring is located between the right outer gasket and the right inner gasket.

[0010] To better realize the present invention, a further technical solution is:

[0011] Furthermore, it also includes:

[0012] The left side body is connected to the left sealed compartment.

[0013] Furthermore, it also includes:

[0014] The right side body is connected to the right side sealed chamber.

[0015] Furthermore, an upper filling seat is provided on the upper part of the main valve body, and an upper valve stem is provided inside the upper filling seat. The lower end of the upper valve stem is connected to the ball.

[0016] Furthermore, an upper bearing is provided between the upper filling seat and the upper valve stem.

[0017] Furthermore, a positioning piece is provided between the top of the upper filling seat and the upper valve stem, and a retaining spring is provided on the upper side of the positioning piece.

[0018] Furthermore, an upper O-ring and an upper second O-ring are provided between the upper filling seat and the upper valve stem, and an upper sealing bearing is provided above the upper O-ring and the upper second O-ring.

[0019] Furthermore, the left sealing chamber bends and protrudes to the left, and the right sealing chamber bends and protrudes to the right.

[0020] Furthermore, the left outer gasket, the left O-ring, and the left inner gasket are located at the protruding corner of the left sealing chamber.

[0021] Furthermore, the right outer gasket, the right O-ring seal, and the right inner gasket are disposed at the protruding corner of the right side sealing chamber.

[0022] One of the advantages of this invention compared to the prior art is:

[0023] This invention discloses a dual-seal compensating ball valve. The front ends of the left and right main sealing rings are tightly fitted to the ball, while their rear ends are pressed against the left and right sealing chambers on their respective sides, forming a tight seal. When prolonged switching causes wear on the main sealing rings, creating gaps, the outer gasket, sealing O-ring, and inner gasket assembly between the upstream main sealing ring and the side sealing chamber provide a bidirectional self-sealing effect for the piston. This ensures that the upstream main sealing ring remains tightly sealed against the ball surface, and the downstream main sealing ring also remains tightly sealed against the ball surface. The rear end of the downstream main sealing ring is pressed against the side sealing chamber. Because the main sealing rings have a yielding elasticity, the ball is prevented from shifting or sliding down, maintaining the basic accuracy of the ball relative to its center. This fully demonstrates that this sealing structure provides both rigid protection and automatic compensating sealing, while each valve seat at both ends has the structural advantage of bidirectional double sealing. The left and right sealing chambers are made of extruded steel plates, resulting in an aesthetically pleasing, environmentally friendly, and cost-effective design. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for reference to some embodiments in this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a double-seal compensating ball valve according to an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of the left-side sealed compartment according to an embodiment of the present invention.

[0027] The figures corresponding to the reference numerals are:

[0028] 1-Main valve body, 2-Left side sealing chamber, 3-Left side body, 4-Right side sealing chamber, 5-Right side body, 6-Ball, 7-Left outer gasket, 8-Left O-ring seal, 9-Left inner gasket, 10-Left main sealing ring, 11-Upper valve stem, 12-Upper filler seat, 13-Upper bearing, 14-Positioning plate, 15-Snap ring, 16-Upper sealing bearing, 17-Upper first O-ring, 18-Upper second O-ring, 19-Right main sealing ring, 20-Right outer gasket, 21-Right O-ring seal, 22-Right inner gasket. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto.

[0030] See Figure 1 As shown, a dual-seal compensating ball valve includes a main valve body 1, a ball 6, a left sealing chamber 2, and a right sealing chamber 4. The ball 6 is disposed within the main valve body 1. The left sealing chamber 2 is disposed on the left side of the main valve body 1. A fluid channel is provided in the middle of the left sealing chamber 2. A left main sealing ring 10 for sealing the ball 6 is disposed on the inner side of the left sealing chamber 2 surrounding the fluid channel. A left outer gasket 7, a left O-ring 8, and a left inner gasket 9 are disposed in a region between the left main sealing ring 10 and the left sealing chamber 2. The sealing ring 8 is located between the left outer gasket 7 and the left inner gasket 9; the right sealing chamber 4 is located on the right side of the main valve body 1, and a fluid channel is provided in the middle of the right sealing chamber 4. A right main sealing ring 19 for sealing the ball 6 is provided inside the right sealing chamber 4 around the fluid channel. A right outer gasket 20, a right O-ring 21 and a right inner gasket 22 are provided in a region between the right main sealing ring 19 and the right sealing chamber 4. The right O-ring 21 is located between the right outer gasket 20 and the right inner gasket 22.

[0031] The front ends of the left main sealing ring 10 and the right main sealing ring 19 are tightly attached to the ball 6, and the rear ends are pressed against the left sealing chamber 2 and the right sealing chamber 4 on their respective sides, forming a tight seal. When the opening and closing time is long, the main sealing rings wear and gaps are formed. The outer gasket, sealing O-ring, and inner gasket assembly between the upstream main sealing ring and the side sealing chamber play a bidirectional self-sealing role for the piston, keeping the upstream main sealing ring tightly attached to the surface of the ball, and the downstream main sealing ring also tightly attached to the surface of the ball. The rear end of the downstream main sealing ring is pressed against the side sealing chamber. Because the main sealing ring has a yielding elasticity, the ball will not deviate or slide down, maintaining the basic accuracy of the ball and the center. This fully demonstrates that the sealing structure has both rigid protection and automatic compensation sealing functions. At the same time, each valve seat at both ends has the structural advantage of bidirectional double sealing.

[0032] The aforementioned left-side sealing chamber 2 and right-side sealing chamber 4 can be formed by extrusion molding of steel plates, resulting in an aesthetically pleasing, environmentally friendly, and cost-effective product. However, the molding methods for the left-side sealing chamber 2 and right-side sealing chamber 4 are not limited to this.

[0033] For example Figure 1 As shown, the left side body 3 is connected to the left sealed chamber 2. The right side body 5 is connected to the right sealed chamber 4.

[0034] An upper filling seat 12 is provided on the upper part of the main valve body 1. An upper valve stem 11 is provided inside the upper filling seat 12, and the lower end of the upper valve stem 11 is connected to the ball 6. An upper bearing 13 is provided between the upper filling seat 12 and the upper valve stem 11. A positioning piece 14 is provided between the top of the upper filling seat 12 and the upper valve stem 11, and a retaining ring 15 is provided on the upper side of the positioning piece 14. An upper first O-ring 17 and an upper second O-ring 18 are provided between the upper filling seat 12 and the upper valve stem 11, and an upper sealing bearing 16 is provided above the upper first O-ring 17 and the upper second O-ring 18.

[0035] Figure 1 , Figure 2 In the middle, the left sealing chamber 2 bends and protrudes to the left, and the right sealing chamber 4 bends and protrudes to the right. The left outer gasket 7, the left O-ring seal 8, and the left inner gasket 9 are located at the protruding corner of the left sealing chamber 2. The right outer gasket 20, the right O-ring seal 21, and the right inner gasket 22 are located at the protruding corner of the right sealing chamber 4.

[0036] In summary, in this invention, the left side of the sphere has a left-side sealing chamber and a left-side sealing assembly to cooperate with the opening or closing sealing function when the sphere rotates. The left end of the main valve body is connected to the left-side sealing chamber. A left outer gasket is installed between the left-side sealing chamber and the left main sealing ring to protect the left O-ring on the outside and to create a pressure chamber on the outside. The left sealing O-ring is installed to seal the valve seat side and to automatically advance and compensate for automatic sealing after the main valve seat wears. The left inner gasket is installed to protect the left sealing O-ring on the inside and to create a pressure chamber on the inside. The rear end of the left main sealing ring presses against the inner plane of the left-side sealing chamber, and the front end presses against the surface of the sphere to play a major sealing role. The protrusion of the left-side sealing chamber is fixedly and sealed to the left side body, which is then connected to other pipes or equipment. On the right side of the sphere, there is a right-side sealing chamber and a right-side sealing assembly to cooperate with the opening or closing sealing function when the sphere rotates. The right end of the main valve body is connected to the right side sealing chamber. A right outer gasket is installed between the right side sealing chamber and the right main sealing chamber to protect the right O-ring seal from the outside and to create a pressure chamber on the outside. The right sealing O-ring provides side sealing for the valve seat and automatically compensates for wear of the main valve seat, creating an automatic seal. A right inner gasket protects the right sealing O-ring from the inside and creates a pressure chamber on the inside. The rear end of the right main sealing ring presses against the inner plane of the right sealing chamber, while the front end presses against the surface of the ball, providing the main seal. The protrusion of the right sealing chamber is fixedly sealed to the right side body, which is then connected to other pipelines or equipment.

[0037] An upper filler seat is located at the upper center of the main valve body. The upper valve stem is housed within the upper filler seat's inner cavity. The lower end of the upper valve stem connects to a groove on the ball, while the upper end connects to an operating handle or other actuator to control the rotation of the ball, thus opening or closing the valve. An upper O-ring and an upper double O-ring both provide a sealing function for the upper valve stem. An upper sealing bearing reduces valve stem torque and provides an additional seal. The upper bearing stabilizes the valve stem and reduces wear on the upper O-rings. A positioning plate stabilizes the rotational position of the upper valve stem; a retaining ring holds the uppermost part in place to prevent the upper bearing from slipping off the positioning plate.

[0038] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0039] In this specification, terms such as "one embodiment," "another embodiment," "embodiment," etc., refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, it is intended to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0040] Although the invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the disclosure and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A double-seal compensating ball valve, characterized in that... include: Main valve body (1); A ball (6) is disposed inside the main valve body (1); A left sealing chamber (2) is provided on the left side of the main valve body (1). A fluid channel is provided in the middle of the left sealing chamber (2). A left main sealing ring (10) for sealing the ball (6) is provided on the inner side of the left sealing chamber (2) around the fluid channel. A left outer gasket (7), a left O-ring (8) and a left inner gasket (9) are provided in a region between the left main sealing ring (10) and the left sealing chamber (2). The left O-ring (8) is located between the left outer gasket (7) and the left inner gasket (9). A right-side sealing chamber (4) is located on the right side of the main valve body (1). A fluid channel is provided in the middle of the right-side sealing chamber (4). A right main sealing ring (19) for sealing the ball (6) is provided inside the right-side sealing chamber (4) around the fluid channel. A right outer gasket (20), a right O-ring (21) and a right inner gasket (22) are provided in a region between the right main sealing ring (19) and the right-side sealing chamber (4). The right O-ring (21) is located between the right outer gasket (20) and the right inner gasket (22).

2. The dual-seal compensating ball valve according to claim 1, characterized in that... Also includes: The left side body (3) is connected to the left sealed chamber (2).

3. The dual-seal compensating ball valve according to claim 1, characterized in that... Also includes: The right side body (5) is connected to the right side sealed chamber (4).

4. The dual-seal compensating ball valve according to claim 1, characterized in that... The upper part of the main valve body (1) is provided with an upper filling seat (12), and an upper valve stem (11) is provided inside the upper filling seat (12). The lower end of the upper valve stem (11) is connected to the ball (6).

5. The dual-seal compensating ball valve according to claim 4, characterized in that... An upper bearing (13) is provided between the upper filler seat (12) and the upper valve stem (11).

6. The dual-seal compensating ball valve according to claim 4, characterized in that... A positioning piece (14) is provided between the top of the upper filling seat (12) and the upper valve stem (11), and a retaining ring (15) is provided on the upper side of the positioning piece (14).

7. The dual-seal compensating ball valve according to claim 4, characterized in that... An upper O-ring (17) and an upper second O-ring (18) are provided between the upper filler seat (12) and the upper valve stem (11), and an upper sealing bearing (16) is provided above the upper O-ring (17) and the upper second O-ring (18).

8. The double-seal compensating ball valve according to claim 1, characterized in that... The left sealing chamber (2) bends and protrudes to the left, and the right sealing chamber (4) bends and protrudes to the right.

9. The dual-seal compensating ball valve according to claim 8, characterized in that... The left outer gasket (7), the left O-ring seal (8), and the left inner gasket (9) are located at the protruding corner of the left side sealing chamber (2).

10. The dual-seal compensating ball valve according to claim 8, characterized in that... The right outer gasket (20), the right O-ring seal (21), and the right inner gasket (22) are located at the protruding corner of the right side sealing chamber (4).

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