Ball valve

Abstract

The utility model provides a ball valve, and belongs to the technical field of valves. The problem that manufacturing is inconvenient is solved. The valve ball and the two valve seats are both located in the valve body, the two valve seats are located on the two sides of the valve ball respectively, the two ends of each connecting pipe are a butt joint end and a connecting end respectively, and the valve body is in a cylinder shape with the two ends open. The butt joint ends of the two connecting pipes abut against the two ends of the valve body respectively, the connecting pipes are fixedly connected with the valve body in a welded mode, positioning steps are formed at the abutting positions of the butt joint ends of the two connecting pipes and the valve body respectively, and the two valve seats abut against the two positioning steps respectively. The utility model has the advantages of convenient manufacture, guaranteed service life and the like.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology and relates to ball valves. Background Technology

[0002] Traditional ball valves consist of a machined body and a machined valve cap connected by threads, but this structure results in high production costs. To reduce production costs, Chinese patent application number 202323026643.7 discloses a ball valve that includes a valve body, a pair of connecting pipes, a valve core located within the valve body, and a sealing assembly. The valve body includes locking sections at both ends, and the ball valve also includes a pair of valve seats, both located within the valve body and at the ends of the valve core. Each valve seat includes an elastic portion on the outer circumferential side and a retaining portion on the inner circumferential side. The elastic portion allows the outer circumferential wall of the valve seat to abut against the inner circumferential wall of the valve body. The constricted section axially positions the valve seat along the axial direction of the valve body, and the constricted section allows the retaining portion to press the sealing assembly against the valve core. The pair of connecting pipes are welded and fixed to the outer ends of the constricted section. During processing, the valve core is placed into the valve body, followed by the sealing assembly and valve seat. A pair of valve seats are positioned at both ends of the valve core. Under the action of the elastic part, the outer circumferential wall of the valve seat abuts against the inner circumferential wall of the valve body. Then, the two ends of the valve body are narrowed to form narrowed sections. During this process, due to the change in the outer diameter of the narrowed sections, the narrowed sections push the valve seats to move until the abutting part presses the sealing assembly onto the valve core, thus positioning the valve seat, sealing assembly, and valve core, completing the assembly. Finally, a pair of connecting pipes are welded and fixed to the outer ends of the two narrowed sections to achieve connection with the pipe fittings.

[0003] The two valve seats are axially positioned by reducing the diameter of the valve body at both ends. It is well known that reducing the diameter is inherently difficult to achieve in practice, especially since the reduction of diameter at both ends of the valve body must be performed simultaneously, which greatly increases the manufacturing difficulty. In particular, the reduction process requires extremely strict precision; the starting point of the reduction must correspond precisely to the position of the valve seat. Otherwise, the valve seat may fail to be properly positioned. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a ball valve, which solves the problem of inconvenient manufacturing.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A ball valve includes a valve body, two connecting pipes, a valve ball and two valve seats, both located within the valve body. The two valve seats are located on both sides of the valve ball. The two ends of the connecting pipes are a butt end and a connecting end, respectively. The valve body is cylindrical with open ends. The butt ends of the two connecting pipes abut against the two ends of the valve body and are welded to the valve body. The abutting points of the two connecting pipes and the valve body form positioning steps, and the two valve seats abut against the two positioning steps.

[0007] During assembly, the valve ball and two valve seats are placed into the valve body. Then, the mating ends of the two connecting pipes are placed against the two ends of the valve body and welded together. After the connecting pipes are fixed to the valve body, the mating ends of the connecting pipes form a positioning step against the valve body, which in turn positions the valve seats. In this ball valve, the valve seat is positioned directly by forming a positioning step after the connecting pipes abut against the valve body. This eliminates the need for end-reduction of the valve body, reducing production costs and manufacturing difficulty. Furthermore, it avoids valve body breakage caused by uncontrolled end-reduction, thus ensuring a longer service life.

[0008] The connecting pipe has two functions: one is to connect with the fittings, and the other is to position the valve seat. In other words, the connecting pipe serves two purposes.

[0009] In the ball valve described above, the connecting pipe has an outwardly flared, trumpet-shaped end, and the inner diameter of the connecting pipe's connecting end is smaller than the inner diameter of the valve body.

[0010] In this ball valve, the valve body is not constricted. To ensure that the connecting pipe's mating end can abut against and be welded to the valve body's end, the connecting pipe's mating end is stamped and flared during production to form a trumpet shape. The inner diameter of the connecting pipe's mating end is smaller than the valve body's inner diameter, ensuring that the aforementioned positioning step is formed at the abutment point after the connecting pipe's mating end abuts against the valve body's end.

[0011] Although this ball valve requires the connecting pipe end to be punched into a flared shape, this operation is relatively simple. It can be done by simply punching it during the production of the connecting pipe. The difficulty of this operation is far less than the difficulty of narrowing the valve body.

[0012] In the ball valve described above, an annular stepped groove is provided on the outer side of the end of the valve body, and an annular flange protrudes from the connecting end of the connecting pipe, with the annular flange abutting against the stepped groove.

[0013] The fit between the annular flange and the stepped groove enables rapid positioning of the mating end of the connection end and the end of the valve body when they come into contact, ensuring coaxiality to reliably form the aforementioned positioning step.

[0014] In the ball valve described above, both the valve body and the connecting pipe are made of stainless steel. The outer circumference of the connecting end of the connecting pipe is provided with a convex ring, and the inner circumference of the connecting end is provided with an annular groove corresponding to the position of the convex ring. A sealing ring is provided in the groove.

[0015] The connecting end of the connecting pipe is actually clamped and fixed to the pipe fitting. During connection, the pipe fitting is inserted into the connecting end of the connecting pipe, and then a clamping tool is used to squeeze the connecting end of the connecting pipe from the outer periphery, causing the connecting end and the pipe fitting to deform and fix together simultaneously. The convex ring is formed directly from the inside to the outside of the connecting end during the production of the connecting pipe, while the groove is formed naturally after the extrusion.

[0016] In the ball valve described above, the valve seat is an annular block shape, the outer peripheral wall of the valve seat abuts against the inner peripheral wall of the valve body, the cross-section of the valve seat is L-shaped, a sealing gasket is positioned on the inner side of the valve seat, and the valve ball abuts against the sealing gasket.

[0017] The valve seat is in the shape of a ring-shaped block, which allows it to better match the positioning steps to achieve stable positioning.

[0018] In the ball valve described above, the outer peripheral wall of the valve seat is provided with an annular mounting groove, and a second sealing ring is provided in the mounting groove. The second sealing ring abuts against the inner wall of the valve body to form a seal.

[0019] After the ball valve is assembled, the second sealing ring prevents leakage between the valve seat and the inner wall of the valve body. During assembly, the second sealing ring also provides friction between the valve seat and the valve body, preventing displacement of the valve seat when welding the connecting pipe to the valve body.

[0020] Compared with existing technologies, this ball valve positions the valve seat by directly forming a positioning step after the connecting pipe abuts against the valve body. This eliminates the need for the end of the valve body to be narrowed, which greatly reduces the manufacturing difficulty and avoids valve body cracking caused by the difficulty in controlling the narrowing, thus ensuring service life. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of Embodiment 1 of this ball valve.

[0022] In the diagram, 1 is the valve body; 1a is the through hole; 2 is the connecting pipe; 2a is the convex ring; 2b is the groove; 3 is the valve ball; 4 is the valve seat; 4a is the mounting groove; 5 is the stem sleeve; 6 is the valve stem; 7 is the handle; 8 is the sealing gasket; 9 is the second sealing ring; 10 is the positioning step; and 11 is the first sealing ring. Detailed Implementation

[0023] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0024] Example 1

[0025] like Figure 1 As shown, the ball valve includes a valve body 1, two connecting pipes 2, a valve ball 3 and two valve seats 4, both located within the valve body 1, with the two valve seats 4 located on either side of the valve ball 3. The valve body 1 is a cylindrical shape with openings at both ends. A through hole 1a is provided on the side of the valve body 1. A rod sleeve 5 is welded and fixed to the side of the valve body 1. A valve stem 6 is provided inside the rod sleeve 5. The inner end of the valve stem 6 passes through the through hole 1a and is connected to the valve ball 3. The outer end of the valve stem 6 extends out of the rod sleeve 5 and is fixedly connected to a handle 7. In this embodiment, the valve seat 4 is an annular block shape, and the outer peripheral wall of the valve seat 4 abuts against the inner peripheral wall of the valve body 1. The cross-section of the valve seat 4 is L-shaped. A sealing gasket 8 is positioned on the inner side of the valve seat 4, and the valve ball 3 abuts against the sealing gasket 8. An annular mounting groove 4a is provided on the outer peripheral wall of the valve seat 4. A sealing ring 9 is provided in the mounting groove 4a, and the sealing ring 9 abuts against the inner wall of the valve body 1 to form a seal.

[0026] like Figure 1As shown, the two ends of the connecting pipe 2 are a butt end and a connecting end, respectively. The butt ends of the two connecting pipes 2 abut against the two ends of the valve body 1, and the connecting pipes 2 are welded to the valve body 1 for fixation. The abutment points of the two connecting pipes 2 with the valve body 1 form positioning steps 10, and the two valve seats 4 abut against the two positioning steps 10 respectively. During assembly, the valve ball 3 and the two valve seats 4 (with the sealing gasket 8 installed on the valve seat 4) are respectively placed into the valve body 1. Then, the butt ends of the two connecting pipes 2 abut against the two ends of the valve body 1, and the connecting pipes 2 are fixed to the valve body 1 by welding. After the connecting pipes 2 are fixed to the valve body 1, the abutment points of the connecting pipes 2 with the valve body 1 form positioning steps 10, and the positioning steps 10 abut against the valve seats 4 to position the valve seats 4. In this ball valve, the valve seat 4 is positioned by directly forming a positioning step 10 after the connecting pipe 2 abuts against the valve body 1. This eliminates the need for a necking operation at the end of the valve body 1, thus preventing breakage of the valve body 1 due to difficulty in controlling the necking, extending its service life, and making manufacturing more convenient. Specifically, the mating end of the connecting pipe 2 is flared outwards into a trumpet shape, and the inner diameter of the mating end of the connecting pipe 2 is smaller than the inner diameter of the valve body 1. To ensure that the mating end of the connecting pipe 2 can abut against and be welded to the end of the valve body 1, the mating end of the connecting pipe 2 is stamped and flared to form a trumpet shape during production. The smaller inner diameter of the mating end of the connecting pipe 2 compared to the inner diameter of the valve body 1 ensures that the aforementioned positioning step 10 is formed at the abutment point after the mating end of the connecting pipe 2 abuts against the end of the valve body 1. Although the ball valve requires the connecting pipe 2 to be stamped into a flared shape at the mating end, this operation is relatively simple. It can be done by simply punching the connecting pipe 2 during production. The difficulty of this operation is far less than that of reducing the neck of the valve body 1. Moreover, this stamping and flaring process is a very mature process with guaranteed processing precision. Both the valve body 1 and the connecting pipe 2 are made of stainless steel. The outer circumference of the connecting end of the connecting pipe 2 is provided with a raised ring 2a, and the inner circumference of the connecting end, corresponding to the position of the raised ring 2a, is provided with an annular groove 2b. A sealing ring 11 is provided in the groove 2b.

[0027] Example 2

[0028] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that in this embodiment, the outer side of the end of the valve body 1 is provided with an annular stepped groove, and the connecting end of the connecting pipe 2 is provided with an annular flange that abuts against the stepped groove.

[0029] The engagement of the annular flange and the stepped groove enables rapid positioning of the mating end of the connection end and the end of the valve body 1 when they come into contact, ensuring coaxiality to reliably form the aforementioned positioning step 10.

[0030] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A ball valve, comprising a valve body (1), two connecting pipes (2), a valve ball (3) and two valve seats (4) both located within the valve body (1), the two valve seats (4) being located on opposite sides of the valve ball (3), and the two ends of the connecting pipes (2) being a butt end and a connecting end, characterized in that, The valve body (1) is a cylindrical shape with open ends. The connecting ends of the two connecting pipes (2) abut against the two ends of the valve body (1) respectively, and the connecting pipes (2) are welded and fixed to the valve body (1). The connecting ends of the two connecting pipes (2) and the abutment of the valve body (1) respectively form positioning steps (10). The two valve seats (4) abut against the two positioning steps (10) respectively.

2. The ball valve according to claim 1, characterized in that, The connecting pipe (2) has an outwardly flared end in the shape of a trumpet, and the inner diameter of the connecting pipe (2) is smaller than the inner diameter of the valve body (1).

3. The ball valve according to claim 2, characterized in that, The valve body (1) has an annular stepped groove on the outer side of its end, and the connecting pipe (2) has an annular flange protruding from its mating end, which abuts against the stepped groove.

4. The ball valve according to claim 1, 2, or 3, characterized in that, The valve body (1) and the connecting pipe (2) are both stainless steel pipes. The outer periphery of the connecting end of the connecting pipe (2) is provided with a convex ring (2a), and the inner periphery of the connecting end is provided with an annular groove (2b) corresponding to the position of the convex ring (2a). A sealing ring (11) is provided in the groove (2b).

5. The ball valve according to claim 1, 2, or 3, characterized in that, The valve seat (4) is an annular block shape. The outer peripheral wall of the valve seat (4) abuts against the inner peripheral wall of the valve body (1). The cross-section of the valve seat (4) is L-shaped. A sealing gasket (8) is positioned on the inner side of the valve seat (4). The valve ball (3) abuts against the sealing gasket (8).

6. The ball valve according to claim 5, characterized in that, The outer peripheral wall of the valve seat (4) is provided with an annular mounting groove (4a), and a sealing ring (9) is provided in the mounting groove (4a). The sealing ring (9) abuts against the inner wall of the valve body (1) to form a seal.

Images