Track ball valve with good sealing effect

Abstract

The utility model discloses a track ball valve with a good sealing effect, the structure of a valve seat of the track ball valve is less limited, the track ball valve is convenient to disassemble, a gap between a ball body and the valve seat is further reduced during sealing, and the sealing effect is better. The ball valve comprises a valve body, an axial flow channel is formed in the valve body, a ball body is arranged in the middle of the axial flow channel, and a valve seat sealing structure is arranged on one side of the ball body and on the axial flow channel, and is characterized in that the valve seat sealing structure comprises a valve seat, a graphite ring and an inner hexagonal flat end set screw, the valve seat is annular and is arranged in a multi-layer sealing mode, and the graphite ring is arranged on the valve seat. A valve seat sealing face can be bent to be attached to a ball body sealing face, the valve seat is installed on the valve body through a hexagon socket set screw with a flat end, the hexagon socket set screw with the flat end does not completely limit the valve seat, displacement allowance exists in the valve seat during sealing, and a graphite ring is installed in a gap between the valve seat and the valve body.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valve devices, in particular to a track ball valve with good sealing effect. Background Art

[0002] The track ball valve is a relatively new type of ball valve. According to different structural forms, the track ball valve can be divided into floating ball valve, fixed ball valve and elastic ball valve. Its working principle is that when the valve is in the fully open position, the valve stem begins to descend and drives the ball to start rotating. When the valve is about to close, the valve stem drives the ball to rotate 90 degrees without friction with the valve seat sealing surface. Then the valve stem continues to descend, mechanically pressing the ball so that it is tightly pressed on the valve seat to achieve a complete seal. Conversely, when the valve is in the fully closed position, the valve stem rises and drives the ball to rotate, so that the valve is opened. Then the existing track ball valve seat structure has many restrictions and is inconvenient to disassemble. When the ball contacts and seals the valve seat, the gap between the ball and the valve seat is still large, and the sealing effect cannot be guaranteed. Utility Model Content

[0003] In view of the shortcomings of the existing track ball valve, such as the ball seat structure is restricted and inconvenient to disassemble, and the gap between the ball and the valve seat may be large after the ball contacts and seals, and the sealing effect cannot be guaranteed, the utility model provides a track ball valve with good sealing effect. Its valve seat structure has fewer restrictions and is easy to disassemble. It further reduces the gap between the ball and the valve seat during sealing, and has a better sealing effect.

[0004] The utility model provides the following technical solutions:

[0005] A track ball valve with good sealing effect, which includes a valve body, an axial flow channel is opened inside the valve body, a ball is arranged in the middle part of the axial flow channel, and a valve seat sealing structure is provided on one side of the ball in the axial flow channel, characterized in that: the valve seat sealing structure includes a valve seat, a graphite ring and a hexagonal flat-end set screw, the valve seat is annular and has a multi-layer sealing arrangement, the valve seat sealing surface can be bent and fits the ball sealing surface, the valve seat is installed on the valve body by the hexagonal flat-end set screw, the hexagonal flat-end set screw does not completely define the valve seat, and the valve seat has a displacement margin when sealing, and a graphite ring is installed in the gap between the valve seat and the valve body.

[0006] It is further characterized by:

[0007] A connecting bracket is installed on the top of the upper valve cover, and the valve stem in the connecting bracket passes through the upper valve cover and the valve body in sequence and is inserted into the ball. A guide groove is provided in the middle part of the valve stem, and the connecting bracket is installed with a guide groove for inserting a support pin into the valve stem. An upper bearing matching the valve stem is provided in the upper valve cover, and the lower end of the ball is inserted into the bottom of the valve body, and a lower bearing matching the ball is provided at the bottom of the valve body.

[0008] A valve core pin is installed in parallel at the connection between the valve stem and the ball, and the valve core pin has a guiding function.

[0009] A sewage discharge channel is provided at the bottom of the valve body, a bottom cover is provided at the opening of the sewage discharge channel, and the bottom cover is connected to the valve body by bolts.

[0010] The connection positions between the connecting bracket and the upper valve cover, and between the upper valve cover and the valve body are all provided with flat keys.

[0011] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0012] The valve seat in the valve seat sealing structure is installed partially by the hexagon socket flat-end set screw. On the one hand, the disassembly and assembly of the valve seat is more convenient. On the other hand, it ensures that the valve seat can be slightly displaced during sealing, ensuring the sealing effect of the valve seat. The valve seat is set as a multi-layer sealing structure, which has a better sealing effect. At the same time, the sealing surface of the valve seat can be slightly curved to better fit the sealing surface of the ball, further enhancing the sealing performance of the valve.

[0013] The graphite ring itself has good sealing performance and after the graphite ring is burned, it relies on the back side of the valve seat and the valve body to form a sealing surface, which has a fire-proof effect;

[0014] Flat keys are added between the connecting bracket and the upper valve cover, as well as between the upper valve cover and the valve body, to ensure the relative position of the valve during installation, so that the ball will not be deflected when the valve stem is in the closed position, and the connecting bracket and the upper valve cover are prevented from rotating together when the torque is too large. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is an enlarged schematic diagram of structure A of the present utility model;

[0017] Figure 3 Schematic diagram of the valve seat multi-layer sealing arrangement structure.

[0018] Description of reference numerals:

[0019] 1. Valve body; 2. Upper valve cover; 3. Valve seat; 4. Ball; 5. Valve stem; 6. Upper bearing; 7. Lower bearing; 8. Bottom cover; 9. Valve core pin; 10. Support pin; 11. Connecting bracket; 12. Graphite ring; 13. Hexagon socket flat point set screw; 14. Flat key. DETAILED DESCRIPTION

[0020] The utility model provides Figure 1The invention shows a track ball valve with good sealing effect, which includes a valve body 1, an upper valve cover 2 inserted into the valve body 1 and fixedly connected by bolts, an axial flow channel is opened inside the valve body 1, a ball 4 is provided in the middle part of the axial flow channel, and the ball 4 is an incomplete hollow sphere. On one side of the ball 4, a valve seat sealing structure is provided in the axial flow channel, and the valve seat sealing structure includes a valve seat 3, a graphite ring 12 and a hexagonal flat-end set screw 13. The valve seat 3 is annular and has a multi-layer sealing arrangement, which includes a graphite layer (see Figure 3 ), its sealing effect is better and the sealing surface of the valve seat 3 can be slightly curved to better fit the sealing surface of the ball 4. The valve seat 3 is installed on the valve body 1 by the hexagonal flat-end set screw 13. The hexagonal flat-end set screw 13 does not completely limit the valve seat 3. The valve seat 3 can be slightly displaced when sealing, further improving the sealing performance. A graphite ring 12 is installed in the gap between the valve seat 3 and the valve body 1. The graphite ring 12 has good sealing and corrosion resistance. When the graphite ring 12 burns, it relies on the back side of the valve seat 3 and the valve body 1 to form a sealing surface and has a fire-proof effect;

[0021] A connecting bracket 11 is installed on the top of the upper valve cover 2. The valve stem 5 in the connecting bracket 11 passes through the upper valve cover 2 and the valve body 1 in sequence and is inserted into the ball 4. A guide groove is provided in the middle part of the valve stem 5. A support pin 10 is installed on the connecting bracket 11 to insert into the guide groove of the valve stem 5. An upper bearing 6 matching the valve stem 5 is provided in the upper valve cover 2. The lower end of the ball 4 is inserted into the bottom of the valve body 1. A lower bearing 7 matching the ball 4 is provided at the bottom of the valve body 1.

[0022] A valve core pin 9 is installed in parallel at the connection between the valve stem 5 and the ball 4, and the valve core pin 9 has a guiding function;

[0023] A sewage discharge channel is provided at the bottom of the valve body 1, and a bottom cover 8 is provided at the opening of the sewage discharge channel. The bottom cover 8 is connected to the valve body 1 by bolts.

[0024] Flat keys 14 are provided at the connection points between the connecting bracket 11 and the upper valve cover 2 as well as between the upper valve cover 2 and the valve body 1. The flat keys 14 ensure the relative position of the valve during installation.

[0025] The working principle of this utility model:

[0026] When the valve needs to close, the valve stem 5 begins to descend, causing the ball 4 to separate from the valve seat 3 and begin to rotate. As the valve stem 5 continues to descend, the support pins act on it, causing both the valve stem 5 and the ball 4 to rotate 90° simultaneously. Nearing closing, the ball 4 has already rotated 90° without contacting the valve seat 3. As the valve stem 5 continues to descend, it mechanically wedges the ball 4, pressing it tightly against the valve seat 3 to complete the seal. During this downward pressure, slight compression occurs between the valve seat 3 and the graphite ring 12, enhancing the sealing performance of the valve seat 3.

Claims

1. A track ball valve with good sealing effect, comprising a valve body, an upper valve cover inserted into the valve body and fixedly connected by bolts, an axial flow channel defined within the valve body, a ball disposed in the middle of the axial flow channel, and a valve seat sealing structure disposed on one side of the ball, characterized in that: The valve seat sealing structure includes a valve seat, a graphite ring and a hexagonal flat-end set screw. The valve seat is annular and has a multi-layer sealing arrangement. The valve seat sealing surface can be bent and fits the spherical sealing surface. The valve seat is installed on the valve body by means of a hexagonal flat-end set screw. The hexagonal flat-end set screw does not completely define the valve seat. There is a displacement margin for the valve seat when sealing. A graphite ring is installed in the gap between the valve seat and the valve body.

2. The track ball valve with good sealing effect according to claim 1, characterized in that: A connecting bracket is installed on the top of the upper valve cover, and the valve stem in the connecting bracket passes through the upper valve cover and the valve body in sequence and is inserted into the ball. A guide groove is provided in the middle part of the valve stem, and the connecting bracket is installed with a guide groove for inserting a support pin into the valve stem. An upper bearing matching the valve stem is provided in the upper valve cover, and the lower end of the ball is inserted into the bottom of the valve body, and a lower bearing matching the ball is provided at the bottom of the valve body.

3. The track ball valve with good sealing effect according to claim 2, characterized in that: A valve core pin is installed in parallel at the connection between the valve stem and the ball, and the valve core pin has a guiding function.

4. The track ball valve with good sealing effect according to claim 3, characterized in that: A sewage discharge channel is provided at the bottom of the valve body, a bottom cover is provided at the opening of the sewage discharge channel, and the bottom cover is connected to the valve body by bolts.

5. The track ball valve with good sealing effect according to claim 4, characterized in that: The connection positions between the connecting bracket and the upper valve cover, and between the upper valve cover and the valve body are all provided with flat keys.

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