A ball valve

Abstract

This utility model belongs to the field of valve technology, and particularly relates to a ball valve, comprising: a valve core; a valve body having a space for accommodating the valve core, an inlet and an outlet horizontally communicating with the space, and an opening communicating upwards; further comprising: a first metal valve seat; a second metal valve seat; a valve cover, the valve cover being detachably fixed to the upper part of the valve body; a valve stem, the valve stem vertically passing through the valve cover and connected to the valve core; a stop member, the stop member fixing the second metal valve seat to the valve body; wherein, the second metal valve seat has a groove portion formed along its outer periphery, and the stop member has at least one pin, the space having an insertion hole, the pin penetrating from the upper part of the valve body into the space and inserting into the insertion hole, and being assembled into the groove portion of the second metal valve seat. Compared with the prior art, this utility model effectively reduces the maintenance difficulty of the ball valve and facilitates the maintenance of the ball valve.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and in particular relates to a ball valve. Background Technology

[0002] A ball valve is a type of valve in which the opening and closing element (ball) is driven by the valve stem and rotates around the axis of the ball valve. For example, a ball valve with a multi-seal structure stuffing box disclosed in patent application number CN202421992115.9 includes a valve body, a valve stem is vertically installed inside the valve body, a stuffing groove is provided at the upper part of the valve body near the valve stem, a metal spacer ring is provided in the middle of the stuffing groove, the metal spacer ring is sleeved on the valve stem, dividing the stuffing groove into upper and lower spaces, and stuffing rings are installed on the upper and lower surfaces of the metal spacer ring.

[0003] The existing ball valve has problems such as the metal seat getting stuck due to thermal expansion at high temperatures, making it difficult to disassemble, and the accumulation of impurities leading to maintenance difficulties. The ball valve is difficult to maintain, so it is necessary to make improvements. Utility Model Content

[0004] The purpose of this utility model is to address the aforementioned technical problems by providing a ball valve that effectively facilitates ball valve maintenance.

[0005] In view of this, the present invention provides a ball valve, comprising:

[0006] The valve core is spherical;

[0007] A valve body having a space for accommodating a valve core, an inlet and an outlet communicating horizontally with the space, and an opening communicating upward.

[0008] Also includes:

[0009] A first metal valve seat, which is detachably mounted in the direction of the entrance to the space;

[0010] A second metal valve seat is detachably mounted in the outlet direction of the space;

[0011] A valve cover, which is detachably fixed to the upper part of the valve body;

[0012] A valve stem that passes vertically through the valve cover and is connected to the valve core;

[0013] A stop element that secures the second metal valve seat to the valve body;

[0014] The second metal valve seat has a groove portion formed along its outer periphery, and the plate stop has at least one pin. The space has an insertion hole, and the pin penetrates from the upper part of the valve body into the insertion hole of the space and is fitted into the groove portion of the second metal valve seat.

[0015] In this technical solution, the ball valve's maintenance is effectively facilitated by the detachable design of the first and second metal valve seats and the valve cover, eliminating the need to disassemble the pipeline. Simultaneously, the second metal valve seat is fixed by a stop, ensuring its installation stability while facilitating disassembly. Compared to existing technologies, this invention effectively reduces the maintenance difficulty of the ball valve and makes its upkeep more convenient.

[0016] Furthermore, the above technical solution also includes:

[0017] An elastic member is located between the outer surface of the first metal valve seat and the inlet side surface of the valve body to press the first metal valve seat against the valve core.

[0018] In the above technical solution, the elastic component is further described as a disc spring, a helical spring, or a corrugated spring.

[0019] Furthermore, the above technical solution also includes:

[0020] A tapered rod is disposed between a valve stem and a valve core for connecting the valve stem and the valve core. The tapered rod includes a first end and a second segment opposite to each other, a first portion and a second portion between the first end and the second end, and at least one sealing ring.

[0021] The first portion has a circular cross-section and is formed into a cone extending along the central direction, and has a first groove around its outer surface, with at least one sealing ring disposed in the first groove.

[0022] In the above technical solution, the first part further includes a second groove around its outer surface, and one of the at least one sealing ring is disposed in the first groove, and the other sealing ring is disposed in the second groove.

[0023] In the above technical solution, the second part has a circular cross-section, the axial direction of its outer surface is parallel to the central direction, and it has a third groove formed around its outer surface, wherein one of the at least one sealing rings is disposed in the third groove.

[0024] The beneficial effects of this utility model are:

[0025] 1. The detachable design of the first and second metal valve seats and valve cover can effectively facilitate the maintenance of the ball valve without disassembling the pipeline. At the same time, the second metal valve seat is fixed by a stop, which facilitates the disassembly of the second metal valve seat while ensuring the installation stability of the second metal valve seat.

[0026] 2. The design of the elastic component maintains the preload of the first metal valve seat on the valve core, ensuring the sealing effect. At the same time, it allows the first metal valve seat to move, preventing the valve core from becoming difficult to disassemble due to thermal expansion of the first metal valve seat at high temperatures, which further facilitates the maintenance of the ball valve.

[0027] 3. The tapered rod design allows the valve stem to automatically press tightly against the sealing surface under its own weight and external pressure, ensuring a good seal. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a specific embodiment of the present utility model.

[0030] Figure 2 This is a schematic diagram of the main structure of the ball valve of this utility model.

[0031] Figure 3 This is a schematic diagram of the assembled structure of the ball valve of this utility model.

[0032] Figure 4 This is an enlarged structural schematic diagram of the second metal valve seat of this utility model.

[0033] Figure 5 This is a schematic diagram of the stop component of this utility model.

[0034] Figure 6 This is an enlarged structural schematic diagram of the tapered rod of this utility model.

[0035] Figure 7 This is a schematic diagram of the tapered rod structure of this utility model.

[0036] The markings in the diagram are as follows:

[0037] 1. Valve core; 2. Valve body; 200. Inlet; 201. Outlet; 202. Opening; 3. First metal valve seat; 4. Second metal valve seat; 40. Groove portion; 5. Valve cover; 6. Valve stem; 7. Stop; 70. Pin; 8. Elastic member; 9. Tapered rod; 90. First end; 91. Second end; 92. First part; 93. Second part; 94. First groove; 95. Second groove; 96. Third groove; 10. Sealing ring; 11. Packing gland; 12. Metal C-ring; 13. Upstream insertion hole; 14. Downstream insertion hole; 15. Clamp bolt; 16. Bushing. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0040] In one embodiment of this utility model, a ball valve includes: a valve core 1, which is spherical; a valve body 2, which has a space for accommodating the valve core 1, an inlet 200 and an outlet 201 horizontally communicating with the space, and an opening 202 upwardly communicating; it also includes: a first metal valve seat 3, which is detachably mounted in the direction of the inlet 200 of the space; a second metal valve seat 4, which is detachably mounted in the direction of the outlet 201 of the space; a valve cover 5, which is detachably fixed to the upper part of the valve body 2; a valve stem 6, which vertically passes through the valve cover 5 and is connected to the valve core 1; and a stop member 7, which fixes the second metal valve seat 4 to the valve body 2.

[0041] The second metal valve seat 4 has a groove portion 40 formed along its outer periphery, and the plate stop 7 has at least one pin 70 with an insertion hole in the space. The pin 70 penetrates from the upper part of the valve body 2 into the insertion hole in the space and is fitted into the groove portion 40 of the second metal valve seat 4.

[0042] It also includes: an elastic member 8, which is located between the outer surface of the first metal valve seat 3 and the inlet 200 side surface of the valve body 2, so as to press the first metal valve seat 3 against the valve core 1.

[0043] The elastic component 8 is one of a disc spring, a helical spring, or a corrugated spring.

[0044] When the ball valve is installed in the pipeline, fluid flows into the valve body 2 through the inlet 200, passes through the valve core 1, and is discharged through the outlet 201. The valve core 1 has a through hole in the center for fluid flow, and the upper part of the valve core 1 is connected to the valve stem 6.

[0045] The valve cover 5 is detachably mounted on the upper part of the valve body 2 by fastening devices such as hex bolts and / or stud bolts. The valve stem 6 passes vertically through the valve cover 5, and the lower part of the valve stem 6 is connected to the upper part of the valve core 1. The upper part of the valve stem 6 is fastened with a drive source (not shown) that causes the valve stem 6 to rotate or move up and down. The drive source can be, for example, an electric motor or a hydraulic motor, but is not particularly limited to these.

[0046] The valve stem 6 is configured to rotate or move up and down relative to the valve cover 5. A packing gland 11 is clamped between the valve cover 5 and the valve stem 6 to seal the valve interior from the outside. A flange of the packing gland 11 can be installed on the upper part of the valve cover 5 by means of bolts or other fastening methods, supporting the packing gland 11. In addition, a bracket is provided, which can be attached upward to the valve body 2 to facilitate the installation of the ball valve in a pipeline or the replacement of the ball valve installed in the pipeline.

[0047] Preferably, in the ball valve according to the present invention, the construction of each metal valve seat differs depending on the respective functions of the upstream first metal valve seat 3 and the downstream second metal valve seat 4. The upstream first metal valve seat 3 has a guiding function that allows the valve core 1 to be positioned at the center of the valve body 2, and for this purpose, it may include an elastic member 8 such as a disc spring or a coil spring. For example, an elastic member 8 is sandwiched between the outer surface of the first metal valve seat 3 and the surface of the valve body 2 on the inlet 200 side, which presses the first metal valve seat 3 against the valve core 1 so that the valve core 1 is always in close contact with the downstream second metal valve seat 4.

[0048] The downstream second metal valve seat 4 performs the main function of the valve, namely the blocking function. For this purpose, a metal C-ring 12 is installed between the second metal valve seat 4 and the valve body 2.

[0049] An opening 202 is formed in the upper part of the valve body 2 to communicate with the ball receiving space for receiving the ball, and the valve core 1 can be inserted into the valve body 2 through the opening 202, or the valve core 1 inside the valve body 2 can be moved to the outside to replace the valve core 1.

[0050] Two insertion holes communicating with the space are also formed around the opening 202. The upstream insertion hole 13 is for inserting the clamp bolt 15 when replacing the valve core 1, and the downstream insertion hole 14 is for inserting the stop 7 for fixing the second metal valve seat 4.

[0051] The upstream first metal valve seat 3 is an annular component, installed within the space of the valve body 2, between the inner surface of the inlet 200 and the valve core 1. An elastic member 8 is installed between the outer surface of the first metal valve seat 3 and the surface of the valve body 2. The elastic member 8 can be implemented as multiple disc springs. The elastic member 8 presses the first metal valve seat 3 against the valve core 1, causing the valve core 1 to be in close contact with the downstream second metal valve seat 4.

[0052] When valve core 1 needs to be replaced, clamp bolt 15 can be inserted into upstream insertion hole 13 to remove the first metal plate valve seat. That is, when clamp bolt 15 with a tapered tip is inserted into upstream insertion hole 13 of valve body 2 and descends, the tip of clamp bolt 15 contacts and presses against the inclined surface of the first metal valve seat 3 due to the inclination of the inclined surface, thereby compressing the elastic member 8 and causing the first metal valve seat 3 to fall off the valve core 1. When the first metal valve seat 3 separates from the valve core 1, the force exerted by the first metal valve seat 3 on the valve core 1 is released, and in this state, the valve core 1 can be removed through opening 202.

[0053] The second metal valve seat 4 on the downstream side is installed as a ring-shaped component in the space between the valve core 1 and the valve body 2. The second metal valve seat 4 contacts the valve core 1 to seal the contact surface between the valve core 1 and the second metal valve seat 4.

[0054] A groove portion 40 is formed along the outer surface of the second metal valve seat 4, allowing the stop member 7 to be fitted into the groove portion 40. The stop member 7, used to secure the second metal valve seat 4 to the valve body 2, consists of a strip-shaped member having a predetermined length in the horizontal direction and pins 70 bent at right angles and extending from both ends thereof. The pins 70 on both sides are inserted through the downstream insertion hole 14 in the upper part of the valve body 2 and engage with the groove portion 40 of the second metal valve seat 4, thereby firmly securing the second metal valve seat 4 to the valve body 2.

[0055] Additionally, the second metal valve seat 4 includes a metal C-ring 12, which is disposed in a groove formed on the surface of the valve body 2 in the downstream direction, and the metal C-ring 12 is used to prevent leakage and seal between the second metal valve seat 4 and the valve body 2.

[0056] The metal C-ring 12 can be composed of a ring-shaped spring and a ring-shaped outer sleeve surrounding the spring. The spring is ring-shaped, and the sleeve is a ring that surrounds the outside of the spring, but with a C-shaped cross-section.

[0057] In this embodiment, firstly, during the assembly of the ball valve, a first metal valve seat 3 and a second metal valve seat 4 are installed on the upstream and downstream sides of the space of the valve body 2, respectively. At this time, with the first metal valve seat 3 in place, the first metal valve seat 3 is further fixed by inserting an elastic member 8 made of a disc spring. With the second metal valve seat in place, the second metal valve seat 4, on which a metal C-ring 12 is installed, is attached to the valve body 2. The stop 7 is inserted into the downstream insertion hole at the upper part of the valve body 2, and the pin 70 is embedded in the groove portion 40 to secure the stop 7.

[0058] Next, the clamp bolt 15 is inserted into the upstream insertion hole 13 of the valve body 2 so that the first metal valve seat 3 moves backward toward the inlet 200 to provide enough space to insert the valve core 1 into the space. Then, the valve core 1 is inserted into the space through the opening 202 of the valve body 2 and the clamp bolt 15 is removed so that the valve core 1 is in close contact with the metal valve seats on both sides. Then, the upper parts such as the valve cover 5 and the valve stem 6 are assembled and tightened to complete the ball valve assembly.

[0059] Disassembling the ball valve can be done in the reverse order of the ball valve assembly process described above.

[0060] In another embodiment of the present invention, it further includes: a tapered rod 9, which is disposed between the valve stem 6 and the valve core 1 for connecting the valve stem 6 and the valve core 1. The tapered rod 9 includes a first end 90 and a second end 91 opposite to each other, a first part 92 and a second part 93 between the first end 90 and the second end 91, and at least one sealing ring 10.

[0061] The first part 92 has a circular cross-section and is formed as a cone extending along the central direction, and has a first groove 94 around its outer surface, with at least one sealing ring 10 disposed in the first groove 94.

[0062] The first part 92 also includes a second groove 95 surrounding its outer surface, and at least one of the sealing rings 10 is disposed in the first groove 94, and the other sealing ring 10 is disposed in the second groove 95.

[0063] The second part 93 has a circular cross-section, the axial direction of its outer surface is parallel to the central direction, and has a third groove 96 formed around its outer surface, wherein one of the sealing rings 10 is disposed in the third groove 96.

[0064] A corresponding bushing 16 is installed in the valve body 2 or valve cover 5 to mate with the tapered rod 9. The tapered rod 9 is rotatably disposed within the bushing 16, and the rotation of the tapered rod 9 causes the valve core 1 to rotate, thereby controlling the opening and closing of the ball valve. The tapered rod 9 passes through the valve body 2, and its first end 90 is connected to the valve core 1, while its second end 91 is connected to the valve stem 6. The outer surfaces of the first portion 92 and the second portion 93 of the tapered rod 9, installed in the bushing 16, are in close contact with the inner surface of the bushing 16 and have an elastic sealing ring 10. The sealing ring 10 is appropriately compressed between the tapered rod 9 and the bushing 16 to fill the internal space of the valve body 2 or valve cover 5. That is, the inner surface of the bushing 16 and the first portion 92 of the tapered rod 9 form an inclined surface, thereby ensuring a tight connection between the two.

[0065] In this embodiment, during the use of the ball valve, the valve stem 6 and the valve core 1 are connected by a tapered rod 9. Under the action of its own weight and external pressure, the tapered rod 9 automatically presses against the inner wall of the bushing 16, so that the seal can still be maintained even if the sealing ring 10 is worn. Furthermore, the design of multiple grooves can combine multiple sealing rings 10, thereby increasing the reliability of the seal.

[0066] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A ball valve, comprising: Valve core (1), wherein the valve core (1) is spherical; The valve body (2) has a space for accommodating the valve core (1) and an inlet (200) and an outlet (201) that are horizontally connected to the space, and an opening (202) that is upwardly connected. Its characteristic is that it further includes: First metal valve seat (3), the first metal valve seat (3) is detachably installed in the direction of the entrance (200) of the space; The second metal valve seat (4) is detachably mounted in the direction of the outlet (201) of the space; Valve cover (5), which is detachably fixed to the upper part of valve body (2); Valve stem (6), which passes vertically through valve cover (5) and is connected to valve core (1); Stop (7), which fixes the second metal valve seat (4) to the valve body (2); The second metal valve seat (4) has a groove portion (40) formed along its outer periphery, and the stop (7) has at least one pin (70) in the space, the pin (70) penetrating from the upper part of the valve body (2) into the space insertion hole and fitting into the groove portion (40) of the second metal valve seat (4).

2. A ball valve according to claim 1, characterized in that, Also includes: An elastic member (8) is located between the outer surface of the first metal valve seat (3) and the inlet (200) side surface of the valve body (2) to press the first metal valve seat (3) against the valve core (1).

3. A ball valve according to claim 2, characterized in that: The elastic member (8) is one of a disc spring, a helical spring, or a corrugated spring.

4. A ball valve according to claim 1, characterized in that, Also includes: A tapered rod (9) is disposed between the valve stem (6) and the valve core (1) for connecting the valve stem (6) and the valve core (1). The tapered rod (9) includes a first end (90) and a second end (91) opposite to each other, a first portion (92) and a second portion (93) between the first end (90) and the second end (91), and at least one sealing ring (10). The first portion (92) has a circular cross-section and is formed as a cone extending along the central direction, and has a first groove (94) around its outer surface, and at least one sealing ring (10) is disposed in the first groove (94).

5. A ball valve according to claim 4, characterized in that: The first portion (92) further includes a second groove (95) surrounding its outer surface, and one of the at least one sealing ring (10) is disposed in the first groove (94) and the other sealing ring (10) is disposed in the second groove (95).

6. A ball valve according to claim 5, characterized in that: The second part (93) has a circular cross-section, the axial direction of its outer surface is parallel to the central direction, and has a third groove (96) formed around its outer surface, wherein one of the at least one sealing rings (10) is disposed in the third groove (96).

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