High-pressure ball valve capable of eliminating pressure difference and reducing impact

Abstract

The utility model discloses a high-pressure ball valve capable of eliminating pressure difference and reducing impact, and relates to the technical field of ball valves. Comprising a valve body, two check rings and two valve seats are rotationally connected to the valve body, the valve seats are rotationally connected to the check rings, a ball valve rod is rotationally connected to the valve body, the ball valve rod is rotationally connected with the valve seats, a base is further rotationally connected to the ball valve rod, a ball valve is arranged on the ball valve rod, and a ball center channel and two balance holes are formed in the ball valve. The balance hole which deflects 45 degrees relative to the axis of the ball center channel and penetrates through the ball valve is formed in the ball valve, the pressure difference between the front portion of the valve and the ball center is reduced or eliminated when the valve is opened and closed, impact and scouring of circulating media to the ball center and the like are reduced, noise of the valve is reduced, and the service life of the valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, in particular to a high-pressure ball valve capable of eliminating pressure differences and reducing impacts. Background Art

[0002] As a common fluid control device, ball valves are widely used in industries, municipal administration, construction, etc. When the ball valve is closed, the inertia and pressure changes of the medium fluid often cause the pressure difference between the front of the valve and the center of the ball to increase, resulting in greater impact and noise, and even damage to the valve sealing surface, shortening the service life of the valve.

[0003] The invention patent with announcement number CN111577922A provides a ball valve, which drives the piston rod to slide along the first installation cavity through the ball rod, thereby changing the pressure between the first installation cavity and the second installation cavity, so that the clamping part installed in the second installation cavity can extend into or out of the clamping groove, thereby realizing the unlocking and locking of the ball valve, thereby preventing the ball valve from being easily opened and preventing the medium in the ball valve from being stolen, which is beneficial to improving the safety of the ball valve.

[0004] The above patent lacks the balance between the ball valve ball core channel and the flow channel pressure, which will cause large noise and impact when opening and closing the valve, thereby reducing the wear and tear of the ball valve and the practical life. In the prior art, in order to reduce these problems, a balancing hole is usually set in the ball valve structure. However, the existing balancing hole setting method may have problems such as incomplete effect, complicated operation or affecting the sealing performance of the ball valve. Utility Model Content

[0005] In view of the above technical problems, the present application solves the problem in the prior art that the ball valve lacks a balance between the valve ball center channel and the flow channel pressure.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted in the present application is: a high-pressure ball valve capable of eliminating pressure difference and reducing impact, comprising a valve body, on which two retaining rings and two valve seats are rotatably connected, the valve seats are rotatably connected to the retaining rings, a ball valve stem is rotatably connected to the valve body, the ball valve stem is rotatably connected to the valve seats, a base is also rotatably connected to the ball valve stem, a ball valve is arranged on the ball valve stem, and the ball valve is provided with a ball center channel and two balancing holes.

[0007] In order to better realize the utility model, further, the two balancing holes on the ball valve are set through.

[0008] In order to better realize the utility model, further, the two balance holes on the ball valve are communicated with the ball center channel.

[0009] In order to better implement the utility model, further, the angle between the two balancing holes on the ball valve and the ball center channel is 45 degrees.

[0010] In order to better implement the present utility model, further, the hole area of the balance hole is less than 2% of the valve passage area.

[0011] The technical solution provided by the present utility model has the following beneficial effects compared with the prior art:

[0012] 1. By providing a balance hole deflected by forty-five degrees, the present utility model significantly reduces the pressure difference and fluid impact during the opening and closing of the ball valve, reduces the noise level during the operation of the valve, and at the same time extends the service life of the valve. This structural design is simple and has a low cost, is applicable to various ball valve application scenarios, and has high practical value and market application prospects.

[0013] 2. The present utility model improves the setting method of the balance hole in the traditional ball valve structure, improves the safety, stability and economy of the ball valve, and is applicable to various engineering requirements and application scenarios in liquid control systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0015] Figure 2 is a schematic diagram of the structure of the ball valve stem of the present utility model in the open state;

[0016] Figure 3 is a sectional view of the ball valve stem of the present utility model;

[0017] Figure 4 is a schematic diagram of the structure of the ball valve stem of the present utility model in the closed state;

[0018] Figure 5 is a schematic diagram of the ball valve stem of the present utility model;

[0019] In the figure: 101 - valve body; 102 - ball valve stem; 103 - retaining ring; 104 - valve seat; 105 - base. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations.

[0021] Accordingly, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0022] Embodiment 1:

[0023] As Figures 1 to 5 shown, a high-pressure ball valve capable of eliminating pressure difference and reducing impact includes a valve body 101. Two retaining rings 103 and two valve seats 104 are rotatably connected to the valve body 101. The valve seats 104 are rotatably connected to the retaining rings 103. A ball valve stem 102 is rotatably connected to the valve body 101. The ball valve stem 102 is rotatably connected to the valve seats 104. A base 105 is also rotatably connected to the ball valve stem 102. A ball valve is provided on the ball valve stem 102. The ball valve is provided with a ball center channel and two balance holes.

[0024] During use, the valve body 101 is fixed on the pipeline, and the pipeline is connected through the retaining rings 103 and the valve seats 104 to form a flow channel. When it is necessary to open the valve flow channel, the ball valve stem 102 is controlled to rotate counterclockwise on the base 105 and the valve body 101, so that the channel on the ball center of the ball valve stem 102 is connected to the flow channels of the retaining rings 103 and the valve seats 104, thereby realizing the transportation of the two sides of the pipeline. When the ball valve stem 102 rotates counterclockwise, the balance holes on the ball center will be connected to the flow channel prior to the ball center channel, so that the transported medium enters the ball center channel through the balance holes, thereby reducing the pressure of the medium on this side and balancing the pressure of the flow channels on both sides of the ball valve stem 102. Then, as the ball valve stem 102 continues to rotate, the ball center channel on the ball valve stem 102 begins to contact the flow channel, and thus the medium begins to be transported. As the area of connection between the ball center channel and the flow channel becomes larger and larger, the balance holes gradually leave the flow channel, that is, they are no longer connected to the flow channel.

[0025] As Figure 5 shown, the two balance holes on the ball valve are provided in a penetrating manner.

[0026] The two balance holes on the ball valve communicate with the ball center channel.

[0027] By providing the balance holes in a penetrating manner, it is convenient for the medium to enter the ball center channel and then communicate with the flow channel on the other side, and the flow channels on both sides are synchronously connected to the ball center channel. It is avoided that after one side's balance hole has been connected to the ball center channel, the other side has not, so that before the other side is connected, the ball center channel has been filled with the medium through the balance hole on this side, thus unable to achieve the effect of balancing pressure.

[0028] The included angle between the two balance holes on the ball valve and the ball center channel is 45 degrees.

[0029] The hole area of the balance hole is less than 2% of the valve passage area. Preferably, the valve is DN32, the hole diameter is 4 mm, and the hole area is 1.5% of the through-hole area of the valve ball center. Thus, the effect of the balance hole in reducing pressure and noise in the flow channel and the ball center channel reaches a good level.

[0030] Two collinear balance holes are drilled in the direction where the axis of the ball center channel deflects by 45 degrees. When the ball center is opened or closed, the balance holes are outside the valve seat and do not affect the leakage rate when the ball valve is closed; when the ball center is opened, the balance holes contact the medium and pressure before the ball center channel. At this time, the medium and pressure fill the ball center channel through the balance holes, making the pressure in the ball center channel consistent with the pressure before the valve; at this time, when the valve is opened and the ball center continues to rotate, the ball center is fully opened. Due to the effect of the balance holes, the pressure before the valve and the pressure in the ball center channel are balanced, reducing or eliminating the pressure difference between the pressure before the valve and the ball center during the opening and closing of the ball center, and also reducing the impact and erosion of the medium pressure on the ball center and the sealing surface of the valve seat, achieving the effects of reducing the valve noise and extending the service life of the valve.

[0031] When the ball valve is closed, reverse the ball valve stem 102. Thus, the connected area between the ball center channel and the flow channel gradually decreases, and the balance hole gradually communicates with the flow channel. After the ball center channel no longer communicates with the flow channel, as the ball valve stem 102 is reversed, the balance hole also gradually moves away from the flow channel, that is, it no longer communicates with the flow channel. If the pressure difference between the two sides of the medium is large, it may increase the operation force of the ball valve, especially more obvious in high-pressure or large-diameter ball valves. Through the balance hole, the force required for operating the ball valve can be reduced, improving the convenience and safety of operation.

[0032] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-pressure ball valve capable of eliminating pressure difference and reducing impact, comprising a valve body (101), characterized in that: The valve body (101) is rotatably connected to two retaining rings (103) and two valve seats (104), the valve seat (104) is rotatably connected to the retaining ring (103), the valve body (101) is rotatably connected to a ball valve stem (102), the ball valve stem (102) is rotatably connected to the valve seat (104), the ball valve stem (102) is also rotatably connected to a base (105), a ball valve is provided on the ball valve stem (102), and the ball valve is provided with a ball center channel and two balancing holes.

2. A high-pressure ball valve capable of eliminating pressure difference and reducing impact according to claim 1, characterized in that: The two balancing holes on the ball valve are arranged through.

3. A high-pressure ball valve capable of eliminating pressure difference and reducing impact according to claim 2, characterized in that: The two balance holes on the ball valve are communicated with the ball center channel.

4. A high-pressure ball valve capable of eliminating pressure difference and reducing impact according to claim 3, characterized in that: The angle between the two balancing holes on the ball valve and the ball center channel is 45 degrees.

5. A high-pressure ball valve capable of eliminating pressure difference and reducing impact according to claim 4, characterized in that: The hole area of ​​the balancing hole is less than 2% of the valve channel area.

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