Hard sealing cut-off ball valve

Abstract

According to the technical scheme, the hard sealing cut-off ball valve is characterized in that the hard sealing cut-off ball valve comprises a first valve body and a second valve body, an installation cavity is defined by the first valve body and the second valve body, the first valve body and the second valve body are each provided with a channel for a medium to flow through, the medium flows to the second valve body along the first valve body, and a ball body is installed in the installation cavity; valve seats are arranged between the ball body and the first valve body and between the ball body and the second valve body; a first sealing piece is arranged between the valve seat and the first valve body, and a second sealing piece is arranged between the valve seat and the second valve body. The first valve body or the second valve body is provided with an auxiliary component enabling the ball body to move towards the second sealing piece. A first nickel-based hard alloy layer is arranged on the ball body, the valve seat comprises a sealing face, a second nickel-based hard alloy layer is arranged on the sealing face, and the hard sealing cut-off ball valve can reduce equipment cost and simplify process production.

Description

Technical Field

[0001] The utility model relates to a ball valve, more specifically, it relates to a hard sealing cut-off ball valve. Background Art

[0002] Valves are control components in fluid delivery systems, especially ball valves, which are widely used in many fields such as petroleum, chemical industry, medicine, metallurgy, mining, food, municipal construction, etc.

[0003] For example, an existing low-torque all-metal double graphite hard-sealed ball valve, application number CN201710464378.0, adds a disc spring and a sealing ring to the valve seat to reduce the influence of deformation or error on the initial force, thereby achieving the minimum sealing force while meeting the minimum sealing pressure ratio.

[0004] Disc spring structures are provided on both sides of the sphere, resulting in the disadvantages of high equipment cost and complicated process. In addition, during the use of the equipment, the liquid in the valve flushes the disc spring on the output side for a long time, which will reduce the service life of the disc spring, thereby weakening the sealing effect on this side and affecting the overall use of the equipment. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model aims to provide a hard-sealed cut-off ball valve, which can reduce equipment costs and simplify process production.

[0006] To achieve the above object, the utility model provides the following technical solutions: a hard-sealed cut-off ball valve, comprising a first valve body and a second valve body, wherein the first valve body and the second valve body together form an installation cavity, wherein the first valve body and the second valve body are both provided with a channel for medium circulation, wherein the medium flows along the first valve body to the second valve body, and a ball is installed in the installation cavity;

[0007] A valve seat is provided between the ball and the first valve body and the second valve body;

[0008] A first sealing member is provided between the valve seat and the first valve body, and a second sealing member is provided between the valve seat and the second valve body;

[0009] The first valve body or the second valve body is provided with an auxiliary component for moving the ball toward the second sealing member;

[0010] The sphere is provided with a first nickel-based hard alloy layer, and the valve seat comprises a sealing surface, and the sealing surface is provided with a second nickel-based hard alloy layer.

[0011] In summary, the utility model has the following beneficial effects: the first valve body and the second valve body together form an installation cavity for installing the ball, and the medium flows from the inlet end of the first valve body through the ball and finally flows out from the outlet end of the second valve body, so that the hard-sealed cut-off ball valve is a unilateral flow design.

[0012] The first seal is arranged at the fluid entry end, and the first seal has an elastic part built in, which can improve the sealing effect between the sealing seat and the ball during the medium flushing process. The lack of elastic parts at the second seal can always maintain the sealing effect of the two during the medium flushing process, reduce the process requirements on the valve seat side, and improve production efficiency.

[0013] The first nickel-based hard alloy layer is sprayed on the spherical surface of the ball, and the second nickel-based hard alloy layer is sprayed on the sealing surface of the valve seat to improve the wear resistance and corrosion resistance between the ball and the valve seat. Nickel-based hard alloy layers of different thicknesses can be sprayed according to specific needs to achieve ideal effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the first embodiment of the hard seal cut-off ball valve;

[0015] Figure 2 for Figure 1 A magnified schematic diagram of point A;

[0016] Figure 3 for Figure 1 An enlarged schematic diagram of point B;

[0017] Figure 4 is a structural schematic diagram of a second embodiment of a first sealing member;

[0018] Figure 5 It is a schematic structural diagram of the third embodiment of the first sealing member.

[0019] Figure numerals: 1. first valve body; 11. first connecting end; 2. second valve body; 21. second connecting end; 22. graphite gasket; 23. filling cavity; 24. graphite filler; 25. pressure plate; 3. mounting cavity; 4. channel; 5. sphere; 51. first nickel-based cemented carbide layer; 52. second nickel-based cemented carbide layer; 6. valve seat; 61. sealing surface; 62. mounting groove; 7. first sealing member; 71. elastic member; 711. disc spring; 712. cylindrical spring; 72. spring seat; 73. first graphite ring; 8. second sealing member; 81. second graphite ring; 9. valve stem; 91. connector; 92. connecting rod; 93. extension portion; 94. mounting hole; 95. thrust pad. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The same parts are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "bottom surface" and "top surface", "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0021] Reference Figures 1 to 5 As shown, in order to achieve the above purpose, the utility model provides the following technical solutions: a hard-sealed cut-off ball valve, comprising a first valve body 1 and a second valve body 2, the first valve body 1 and the second valve body 2 together form an installation cavity 3, the first valve body 1 and the second valve body 2 are both provided with a channel 4 for medium circulation, the medium flows along the first valve body 1 to the second valve body 2, and a ball 5 is installed in the installation cavity 3;

[0022] A valve seat 6 is provided between the ball 5 and the first valve body 1 and the second valve body 2;

[0023] A first sealing member 7 is provided between the valve seat 6 and the first valve body 1 , and a second sealing member 8 is provided between the valve seat 6 and the second valve body 2 ;

[0024] An auxiliary component for moving the ball 5 toward the second sealing member 8 is provided on the first valve body 1 or the second valve body 2;

[0025] The sphere 5 is provided with a first nickel-based hard alloy layer 51 , and the valve seat 6 includes a sealing surface 61 , on which a second nickel-based hard alloy layer 52 is provided.

[0026] In the design of the utility model, the first valve body 1 and the second valve body 2 together form an installation cavity 3 for installing the ball 5. The medium flows from the inlet end of the first valve body 1 through the ball 5 and finally flows out from the outlet end of the second valve body 2. Therefore, the hard-sealed cut-off ball valve is a unilateral flow design.

[0027] The first seal 7 is arranged at the fluid entrance end, and the first seal 7 has an elastic member 71 built in, which can improve the sealing effect between the sealing seat and the ball 5 during the medium flushing process. The second seal lacks the elastic member 71, and the sealing effect of the two is always maintained during the medium flushing process, thereby reducing the process requirements on one side of the valve seat 6 and improving production efficiency.

[0028] A first nickel-based hard alloy layer 51 is sprayed on the spherical surface of the ball 5, and a second nickel-based hard alloy layer 52 is sprayed on the sealing surface 61 of the valve seat 6, so as to improve the wear resistance and corrosion resistance between the ball 5 and the valve seat 6. Nickel-based hard alloy layers of different thicknesses can be sprayed according to specific needs, thereby achieving an ideal effect.

[0029] Due to process problems, there will be a slight deviation between the valve body and the valve stem 9, and through the design of auxiliary components, the valve body with the ball 5 is slightly biased towards the direction of the second seal 8, and the first seal always maintains a high seal with the ball under the action of the elastic part, thereby improving the sealing effect.

[0030] The first sealing member 7 includes an elastic member 71, a spring seat 72 and a first graphite ring 73. The elastic member 71 and the first graphite ring 73 are respectively arranged on both sides of the spring seat 72. The first graphite ring 73 is respectively arranged in contact with the first valve body 1, the valve seat 6 and the spring seat 72.

[0031] The elastic member 71 includes a disc spring 711 and / or a cylindrical spring 712 .

[0032] Embodiment 1, as Figure 1 As shown, it only has disc spring 711;

[0033] Embodiment 2, as Figure 4 As shown, only the cylindrical spring 712 is provided;

[0034] Embodiment three, as Figure 5 As shown, there are disc springs 711 and cylindrical springs 712.

[0035] A stable sealing force is provided by the elastic member 71, and a corresponding implementation method of the elastic member 71 is selected according to the valve size and the usage scenario.

[0036] The second sealing member 8 includes a second graphite ring 81 , and the second graphite ring 81 is disposed in contact with the valve seat 6 and the second valve body 2 , respectively.

[0037] The high temperature resistance and corrosion resistance of graphite rings are utilized to increase the service life of equipment.

[0038] The valve seat 6 is provided with a mounting groove 62 for mounting the first graphite ring 73 or the second graphite ring 81, and the mounting groove 62 is arranged in a trapezoidal structure. The design of this structure can facilitate the graphite ring and form an effective seal through extrusion.

[0039] The first valve body 1 is provided with a first connection end 11 on both upper and lower sides, and the second valve body 2 is provided with a second connection end 21 on both upper and lower sides. The first connection end 11 and the second connection end 21 are connected by bolts.

[0040] A graphite gasket 22 is disposed between the first connection end 11 and the second connection end 21 .

[0041] The design of the graphite gasket 22 can improve the wear resistance and sealing performance of the first connecting end 11 and the second connecting end 21 .

[0042] The valve stem 9 is also included, and the valve stem 9 passes through the second valve body 2 and is connected to the ball 5 .

[0043] The valve stem 9 includes a connector 91 and a connecting rod 92, the connecting rod 92 is connected to the upper end of the connector 91, and extensions 93 are provided on both sides of the connector 91. The extensions 93, the connecting rod 92, and the second valve body 2 together form a mounting hole 94, and a thrust pad 95 is installed in the mounting hole 94. The design of the thrust pad 95 can enhance the sealing performance, avoid leakage, and can fully abut against the connector 91, the connecting rod 92, and the second valve body 2.

[0044] A filling cavity 23 is provided between the second valve body 2 and the connecting rod 92 , and the filling cavity 23 is filled with a graphite filler 24 .

[0045] The filling cavity 23 is designed as a low-leakage V-shaped graphite packing 24 group, which has better sealing performance and high temperature resistance. The design can be applied to various pneumatic and electric cutting conditions, and the torque is light and balanced.

[0046] The auxiliary component includes a pressing plate 25 located above the filling cavity 23, the pressing plate 25 is sleeved above the valve stem 9, a first connecting portion is provided on one side of the pressing plate 25, a second connecting portion is provided on the second valve body 2, and the first connecting portion and the second connecting portion are connected by bolts;

[0047] The first connection portion and the second connection portion are both arranged on a side of the valve stem 9 away from the first sealing member 7 . When the first connection portion is connected to the second connection portion, the valve stem 9 is pushed toward the first sealing member 7 .

[0048] The design of the structure, such as Figure 1 As shown, when the bolts are connected to the first connection part and the second connection part, the pressing plate 25 presses down the graphite packing 24 by continuously tightening, thereby improving the sealing performance of the graphite packing 24;

[0049] During the tightening process, an abutting force will be generated on the right side of the valve stem 9. When there is a gap between the valve stem 9 and the valve body due to process problems, the upper end of the valve stem 9 will move to the left under the action of the abutting force. At this time, the middle part of the valve stem 9 abuts against the valve body, causing the ball 5 below to approach the second sealing member 8. At this time, the first sealing member 7 still maintains a high degree of close contact with the ball 5 due to the action of the elastic member 71, thereby ensuring the high efficiency of the seal.

[0050] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. A hard seal cut-off ball valve, characterized by: The invention comprises a first valve body (1) and a second valve body (2), wherein the first valve body (1) and the second valve body (2) together form a mounting cavity (3), wherein the first valve body (1) and the second valve body (2) are both provided with a channel (4) for medium circulation, wherein the medium flows along the first valve body (1) toward the second valve body (2), and a ball (5) is installed in the mounting cavity (3); A valve seat (6) is provided between the ball (5) and the first valve body (1) and the second valve body (2); A first sealing member (7) is provided between the valve seat (6) and the first valve body (1), and a second sealing member (8) is provided between the valve seat (6) and the second valve body (2); The first valve body (1) or the second valve body (2) is provided with an auxiliary component for moving the ball (5) toward the second sealing member (8); The sphere (5) is provided with a first nickel-based hard alloy layer (51), the valve seat (6) comprises a sealing surface (61), and the sealing surface (61) is provided with a second nickel-based hard alloy layer (52).

2. A hard seal cut-off ball valve according to claim 1, characterized in that: The first sealing member (7) comprises an elastic member (71), a spring seat (72) and a first graphite ring (73); the elastic member (71) and the first graphite ring (73) are respectively arranged on both sides of the spring seat (72); and the first graphite ring (73) is respectively arranged in contact with the first valve body (1), the valve seat (6) and the spring seat (72).

3. A hard seal cut-off ball valve according to claim 2, characterized in that: The elastic member (71) includes a disc spring (711) and / or a cylindrical spring (712).

4. A hard seal cut-off ball valve according to claim 2, characterized in that: The second sealing member (8) comprises a second graphite ring (81), and the second graphite ring (81) is disposed in contact with the valve seat (6) and the second valve body (2) respectively.

5. A hard seal cut-off ball valve according to claim 4, characterized in that: The valve seat (6) is provided with a mounting groove (62) for mounting the first graphite ring (73) or the second graphite ring (81), and the mounting groove (62) is arranged in a trapezoidal structure.

6. A hard seal cut-off ball valve according to any one of claims 1 to 5, characterized in that: The first valve body (1) is provided with a first connection end (11) on both upper and lower sides, and the second valve body (2) is provided with a second connection end (21) on both upper and lower sides, and the first connection end (11) and the second connection end (21) are connected by bolts; A graphite gasket (22) is provided between the first connecting end (11) and the second connecting end (21).

7. A hard seal cut-off ball valve according to any one of claims 1 to 5, characterized in that: It also includes a valve stem (9), which passes through the second valve body (2) and is connected to the ball (5).

8. A hard seal cut-off ball valve according to claim 7, characterized in that: The valve stem (9) comprises a connecting head (91) and a connecting rod (92), wherein the connecting rod (92) is connected to the upper end of the connecting head (91), and extension parts (93) are arranged on both sides of the connecting head (91), and the extension parts (93), the connecting rod (92) and the second valve body (2) together form a mounting hole (94), and a thrust pad (95) is installed in the mounting hole (94).

9. A hard-sealed cut-off ball valve according to claim 8, characterized in that: A filling cavity (23) is provided between the second valve body (2) and the connecting rod (92), and the filling cavity (23) is filled with a graphite filler (24).

10. A hard seal cut-off ball valve according to claim 9, characterized in that: The auxiliary component comprises a pressure plate (25) located above the filling cavity (23), the pressure plate (25) is sleeved above the valve stem (9), a first connecting portion is provided on one side of the pressure plate (25), a second connecting portion is provided on the second valve body (2), and the first connecting portion and the second connecting portion are connected by bolts; The first connection portion and the second connection portion are both arranged on a side of the valve stem (9) away from the first sealing member (7); when the first connection portion is connected to the second connection portion, the valve stem (9) is subjected to a thrust force in the direction of the first sealing member (7).

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