Ball body for C-shaped wear-resistant ball valve

Abstract

The utility model relates to a ball body for a C-shaped wear-resistant ball valve, the ball body is a C-shaped ball body, a sealing belt is arranged on the outer side of the C-shaped ball body, a streamline flow guide inclined plane is formed at a lip of the C-shaped ball body, and a metal sealing ring has elasticity and radial degree of freedom; the C-shaped ball body is driven by the valve rod, the center line of the valve rod forms a first eccentric part relative to the rotation center line of the C-shaped ball body, and the center line of the valve rod and the center line of a flow channel of the ball valve form a second eccentric part. The ball valve has the advantages that the C-shaped ball body is separated from the valve seat at the opening moment, no dead cavity and no material retention area exist in a flow channel when the ball valve is fully opened, and media are all in a flowing state in a valve cavity and are prevented from scaling. Mounting and dismounting are simple and convenient, and reliable sealing performance is guaranteed.

Description

Technical Field

[0001] The utility model relates to a ball body used for a C-type wear-resistant ball valve, belonging to the field of valves for controlling fluids. Background Art

[0002] When the metal hard-sealed ball valve is fully opened, there is a dead space in the middle cavity. The medium entering the middle cavity of the valve will be retained in the dead space in the middle cavity, causing serious scaling on the ball surface, making it difficult to open and close, causing serious problems such as sticking and leakage, or even making it unable to operate, and failing to protect the pump.

[0003] For example, the patent publication number CN101737520A discloses a cryogenic ball valve, including a valve body, a hollow inner cavity, a first valve cover installed at the inlet end of the valve body, a first valve seat installed inside the first valve cover, a second valve cover installed at the outlet end of the valve body, a second valve seat installed inside the second valve cover, and a valve ball rotatably installed inside the hollow inner cavity of the valve body. When the flow channel is closed, the valve ball is in close contact with the first valve seat and the second valve seat to achieve sealing. The technical defects of the above patent document are: the inlet and outlet ends of the hollow inner cavity of the valve body are both provided with valve seats, and when the valve ball rotates to close the flow channel, both valve seats are in close contact with the valve ball. Since the volume of the hollow inner cavity of the valve body is larger than that of the valve ball, there is an empty space inside the hollow inner cavity; when the valve ball rotates to a closed state, when the temperature of the fluid contacting the valve cover on either side increases or decreases, it will cause a pressure difference between the inside of the valve cover and the inside of the hollow inner cavity, resulting in difficulty in switching, and poor sealing performance. Utility Model Content

[0004] In order to overcome the defects of the prior art, the utility model provides a ball for a C-type wear-resistant ball valve. The technical solution of the utility model is:

[0005] A ball for a C-type wear-resistant ball valve, the ball being a C-type ball, a sealing belt being arranged on the outer side of the C-type ball, a streamlined flow guide slope being formed at the lip of the C-type ball, and a metal sealing ring having elasticity and radial freedom; the C-type ball is driven by a valve stem, the center line of the valve stem forming a first eccentric portion relative to the rotation center line of the C-type ball, and the center line of the valve stem and the flow channel center line of the ball valve forming a second eccentric portion.

[0006] A hard alloy layer is spray-welded on the surface of the C-shaped sphere, and a hard alloy layer is built-up on the inner flow channel surface and the lip of the C-shaped sphere.

[0007] The C-shaped sphere is in contact with the valve seat, the alloy layer is a NI60 layer, a NI55 layer is spray-welded on the valve seat, and a hardness difference is formed between the NI60 layer and the NI55 layer.

[0008] The metal sealing ring is arranged in a disc shape.

[0009] The hard alloy layer is one of NI60, NI55, steel, tungsten carbide or chromium carbide.

[0010] The distance between the center line of the valve stem and the rotation center line of the C-shaped sphere is 1-24mm; the angle formed by the line between the center point of the valve stem and the center point of the C-shaped sphere and the horizontal direction is 2°~8°.

[0011] The advantages of the utility model are: the C-shaped ball leaves the valve seat at the moment of opening, there is no dead cavity in the flow channel when fully opened, no material retention area, the medium is in a flowing state in the valve cavity, and the medium is prevented from scaling. The installation and disassembly are simple and convenient, and the reliable sealing performance is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the main structure of the utility model.

[0013] Figure 2 yes Figure 1 C-direction view.

[0014] Figure 3 yes Figure 1 sectional view of .

[0015] Figure 4 It is a schematic diagram of the angle formed by the center line of the valve stem of the utility model, the rotation center line of the C-shaped sphere, and the connecting line between the center point of the valve stem and the center point of the C-shaped sphere and the horizontal direction. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with specific embodiments, and the advantages and features of the present invention will become clearer as the description proceeds. However, these embodiments are merely exemplary and do not constitute any limitation to the scope of the present invention. It should be understood by those skilled in the art that the details and forms of the technical solution of the present invention may be modified or replaced without departing from the spirit and scope of the present invention, but these modifications and replacements fall within the scope of protection of the present invention.

[0017] See also Figures 1 to 4 The utility model relates to a ball for a C-type wear-resistant ball valve, wherein the ball is a C-type ball 1, a sealing belt is arranged on the outer side of the C-type ball 1, and a streamlined flow guide slope is formed at the lip of the C-type ball 1, which is convenient for the liquid in the flow channel to be guided and quickly pass through, and the metal sealing ring has elasticity and radial freedom, so as to ensure the sealing performance when cooperating with the valve seat; the C-type ball 1 is driven by a valve stem (such as Figure 1As shown, an area 3 for mounting a valve stem is provided on the C-type sphere 1), and the center line h of the valve stem forms a first eccentric portion relative to the rotation center line a of the C-type sphere 1. The setting of the first eccentric portion reduces the flow velocity effect between the spherical surface of the C-type sphere and the liquid (or gas) passing through the flow channel, and the contact area between the C-type sphere and the liquid is reduced, reducing the resistance with the liquid (or gas), reducing the possibility of deposition and adhesion with impurities in the liquid during use, and further reducing the impact on sealing. The center line h of the valve stem and the flow channel center line a of the ball valve form a second eccentric portion, and the setting of the second eccentric portion reduces the impact on the flow velocity of the liquid in the flow channel.

[0018] The distance between the center line of the valve stem and the rotation center line of the C-shaped sphere is 1-24 mm; the angle formed by the line between the center point of the valve stem and the center point of the C-shaped sphere and the horizontal direction is 2°~8°.

[0019] The hard alloy layer is spray-welded according to the wear resistance and hardness requirements, wherein the hard alloy layer is one of NI60, NI55, steel, tungsten carbide or chromium carbide.

[0020] A hard alloy layer is spray-welded on the surface of the C-shaped sphere 1, and a hard alloy layer is built-up on the inner flow channel surface and the lip of the C-shaped sphere.

[0021] The C-shaped ball 1 is in contact with the valve seat, the alloy layer is a NI60 layer, and a NI55 layer is spray-welded on the valve seat. A hardness difference is formed between the NI60 layer and the NI55 layer so as to protect the C-shaped ball.

[0022] The working principle of the utility model is:

[0023] The double eccentric structure makes the valve motion trajectory similar to that of a cam mechanism, achieving frictionless travel. The sealing surface of the ball contacts the sealing surface of the valve seat when the valve is initially opened or finally closed (the C-shaped ball is 3 to 5 degrees to the center line of the flow channel).

[0024] When the valve stem drives the C-type ball to gradually close the flow channel, the sealing surface of the C-type ball gradually approaches the valve seat sealing surface, the flow channel becomes smaller, the flow rate increases, and the medium fluid flushes and cleans the valve seat sealing surface.

[0025] In the final closing stroke, the ball sealing surface contacts the valve seat and scrapes the valve seat sealing surface like a scraper, further removing particle deposits that may be attached to the valve seat sealing surface to ensure reliable sealing performance.

[0026] The bonding force of the hard alloy sprayed on the C-type ball sealing surface and the valve seat sealing surface reaches 15000psi and is not easy to fall off.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A ball for a C-type wear-resistant ball valve, characterized in that: The sphere is a C-shaped sphere, a sealing belt is arranged on the outer side of the C-shaped sphere, a streamlined guide slope is formed at the lip of the C-shaped sphere, and the metal sealing ring has elasticity and radial freedom; the C-shaped sphere is driven by a valve stem, the center line of the valve stem forms a first eccentric portion relative to the rotation center line of the C-shaped sphere, and the center line of the valve stem and the flow channel center line of the ball valve form a second eccentric portion; the center line of the valve stem and the rotation center line of the C-shaped sphere are arranged parallel to each other and form a distance; the line between the center point of the valve stem and the center point of the C-shaped sphere forms an angle with the horizontal direction.

2. The ball for a C-type wear-resistant ball valve according to claim 1, characterized in that: A hard alloy layer is spray-welded on the surface of the C-shaped sphere, and a hard alloy layer is built-up on the inner flow channel surface and the lip of the C-shaped sphere.

3. The ball for a C-type wear-resistant ball valve according to claim 2, characterized in that: The C-shaped sphere is in contact with the valve seat, the cemented carbide layer is a NI60 layer, a NI55 layer is spray-welded on the valve seat, and a hardness difference is formed between the NI60 layer and the NI55 layer.

4. The ball for a C-type wear-resistant ball valve according to claim 3, characterized in that: The metal sealing ring is arranged in a disc shape.

5. The ball for a C-type wear-resistant ball valve according to claim 3, characterized in that: The alloy layer is one of NI60, NI55, steel, tungsten carbide or chromium carbide.

6. The ball for a C-type wear-resistant ball valve according to claim 3, characterized in that: The distance between the center line of the valve stem and the rotation center line of the C-shaped sphere is 1-24 mm; the angle formed by the line between the center point of the valve stem and the center point of the C-shaped sphere and the horizontal direction is 2°~8°.

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