Large-diameter C-shaped ball valve easy to adjust

Abstract

The utility model relates to the technical field of ball valves, and provides an easily-adjusted large-diameter C-shaped ball valve which comprises a valve body and a ball body, the upper end of the valve body is rotatably connected with an upper valve rod, the lower end of the valve body is fixedly connected with a lower valve rod, the upper end of the ball body is in transmission connection with the upper valve rod, the lower end of the ball body is rotatably connected with the lower valve rod, and the upper end of the valve body is connected with a valve rod sealing assembly. A valve seat assembly is connected to one end of the valve body runner, a threaded through hole is formed in the bottom of the ball, a supporting base is connected into the threaded through hole, a ball is arranged at the top of the lower valve rod, the supporting base abuts against the ball, and the height of the ball relative to the lower valve rod is changed by changing the depth of the supporting base screwed into the threaded through hole. The height of the ball body relative to the lower valve rod can be changed by changing the depth of screwing the supporting base into the threaded through hole, so that the situation that the ball body is separated from the sealing surface of the valve seat due to the dead weight of the ball body and the sealing fails is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, in particular to an easily adjustable large-caliber C-type ball valve. Background Art

[0002] The eccentric C-type forced seal ball valve (C-type ball valve for short) is a relatively new type of ball valve. Its structural feature is that the eccentricity between the ball core and the valve body is set to achieve rapid contact sealing and separation between the ball core and the valve seat. The advantage of this structure is that there is no friction between the ball core and the valve seat, and the opening and closing torque is small.

[0003] When the C-type valve is made larger in diameter, due to the heavy weight of the ball itself, the weight of the ball will act completely on the lower valve stem when the valve is fully closed and separated from the valve seat. Due to the assembly clearance, the center of the ball flow channel is likely to be lower than the center of the valve seat flow channel, resulting in the ball being unable to properly close on the valve seat sealing surface after multiple openings and closings, thereby causing sealing failure. Utility Model Content

[0004] The utility model aims to provide an easily adjustable large-diameter C-type ball valve to solve the above-mentioned defects.

[0005] The utility model is realized by the following technical solutions:

[0006] A large-caliber C-type ball valve that is easily adjustable comprises a valve body and a ball. The upper end of the valve body is rotatably connected to an upper valve stem, the lower end of the valve body is fixedly connected to a lower valve stem, the upper end of the ball is transmission-connected to the upper valve stem, the lower end of the ball is rotatably connected to the lower valve stem, the upper end of the valve body is connected to a valve stem sealing assembly, one end of the valve body flow channel is connected to a valve seat assembly, a threaded through hole is provided at the bottom of the ball, a support base is connected in the threaded through hole, a ball is provided at the top of the lower valve stem, the support base and the ball are abutted against each other, so that the height of the ball relative to the lower valve stem can be changed by changing the depth of the support base being screwed into the threaded through hole.

[0007] Optionally, a supporting groove for supporting the ball is provided on the top of the lower valve stem, and a clamping groove for clamping the ball is provided on the supporting base.

[0008] Optionally, the valve seat assembly includes a valve seat, a sealing packing, a pressure ring and a four-open ring arranged in sequence along a direction away from the sphere. The valve body is provided with a limiting ring groove for installing the four-open ring. The valve seat is connected to the valve body via a thread. The four-open ring is connected in the circumferential direction with a plurality of first screws for tightening the valve seat and a plurality of second screws for tightening the pressure ring.

[0009] Optionally, a gap is left between the upper valve stem and the valve stem sealing assembly in the height direction.

[0010] Optionally, a grinding process hole is provided on the top of the sphere, and the axis of the grinding process hole passes through the center of the sphere.

[0011] Optionally, an eccentricity detection process surface is provided on one side of the grinding process hole.

[0012] This practical technical solution has at least the following advantages and beneficial effects:

[0013] 1. In the utility model, a threaded through hole is provided at the bottom of the sphere, a support base is connected in the threaded through hole, a ball is provided at the top of the lower valve stem, and the support base and the ball are against each other. In this way, the height of the sphere relative to the lower valve stem can be changed by changing the depth of the support base screwed into the threaded through hole, thereby avoiding the situation where the sphere is separated from the valve seat sealing surface due to its own weight and the sealing fails.

[0014] 2. In the utility model, the valve seat is connected to the valve body through a thread. Due to the gap in the thread itself, when the medium has a reverse force, the valve seat will be pushed away from the sphere by the medium, which is prone to sealing leakage. The first screws connected in the circumferential direction of the four open rings solve this problem. After the first screws are tightened, they press on the valve seat and press the valve seat to ensure that the medium pressure cannot push the valve seat away from the sphere. At this time, the medium pressure still acts on the valve body through the valve seat thread in most cases, the screws are subjected to less force, and the valve sealing reliability is high.

[0015] 3. In the utility model, a gap is left between the upper valve stem and the valve stem sealing assembly in the height direction, so that the upper valve stem has a certain movable gap in the axial direction while it is driving, thereby preventing the ball from being pressed against each other up and down during assembly, thereby preventing the ball from being bent and deformed due to force when pressing against each other, causing the valve to fail to seal.

[0016] 4. In the utility model, a grinding process hole is provided on the top of the sphere, and the axis of the process hole passes through the center of the sphere. When the sealing surface is scratched or bumped during the valve assembly process, this hole can be used for positioning and the sealing surface can be re-sprayed and ground.

[0017] 5. In the utility model, an eccentricity detection process surface is provided on one side of the grinding process hole. The process surface is the reference position for the eccentricity detection and repair of the sphere. After adding the process plane, the eccentricity detection of the sphere no longer needs to be carried out using a three-coordinate measuring machine, which greatly reduces the inspection time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1A schematic diagram of the structure of an easily adjustable large-diameter C-type ball valve provided by the utility model;

[0020] Figure 2 for Figure 1 Schematic diagram of point A;

[0021] Figure 3 is a top view of the sphere;

[0022] Figure 4 for Figure 1 A local schematic diagram of the B direction;

[0023] Figure 5 for Figure 3 A partial schematic diagram of the CC section;

[0024] Icon: 1-valve body, 2-ball, 201-grinding process hole, 202-eccentricity detection process surface, 203-valve stem hole, 204-pin hole, 3-upper valve stem, 4-valve stem sealing assembly, 5-lower valve stem, 6-support base, 7-ball, 8-valve seat assembly, 801-valve seat, 802-sealing packing, 803-pressure ring, 804-four open rings, 9-first screw, 10-second screw. DETAILED DESCRIPTION

[0025] refer to Figure 1 , an easily adjustable large-caliber C-type ball valve, comprising a valve body 1 and a ball 2, wherein the upper end of the valve body 1 is rotatably connected to an upper valve stem 3, the lower end of the valve body 1 is fixedly connected to a lower valve stem 5, the upper end of the ball 2 is transmission-connected to the upper valve stem 3, and the specific transmission connection method is not limited. For example, in this embodiment, a valve stem hole 203 matching with the upper valve stem 3 is provided at the top of the ball 2, three pin holes 204 are provided in the valve stem hole 203, and three pin holes 204 are also provided at the corresponding positions of the bottom of the upper valve stem 3, and transmission pins are provided at the pin holes 204 corresponding to the valve stem holes 203 of the upper valve stem 3. For example, in other embodiments, a transmission hole of a rectangular structure is provided at the upper end of the ball 2, and the lower end of the upper valve stem 3 is also a rectangular structure matching with the transmission hole.

[0026] It is worth noting that the C-type valve is very sensitive to the cumulative tolerance of the flow channel axial direction. Sometimes a cumulative tolerance of 0.1mm will cause the valve to not close properly or close too much. Once the cumulative tolerance is not well controlled, the valve needs to be disassembled and reassembled for repair. Figure 1 and Figure 3In this embodiment, a grinding process hole 201 is provided on the top of the sphere 2, and the axis of the grinding process hole 201 passes through the center of the sphere 2. When the sealing surface is scratched or bumped during the valve assembly process, this hole can be used for positioning and the grinding sealing surface can be re-sprayed. Furthermore, an eccentricity detection process surface 202 is provided on one side of the grinding process hole 201 (that is, the grinding process hole 201 is a D-shaped structure from a top view). This process surface is the reference position for the eccentricity detection and repair of the sphere 2. After adding this process plane, the eccentricity detection of the sphere 2 no longer needs to be detected by a three-coordinate measuring machine, which greatly reduces the inspection time.

[0027] refer to Figure 1 and Figure 2 The lower end of the ball 2 is rotatably connected to the lower valve stem 5. A threaded through hole is provided at the bottom of the ball 2, and a support base 6 is connected in the threaded through hole. A ball 7 is provided on the top of the lower valve stem 5, and the support base 6 and the ball 7 are against each other. In this way, the height of the ball 2 relative to the lower valve stem 5 can be changed by changing the depth of the support base 6 screwed into the threaded through hole, thereby avoiding the situation where the ball 2 is separated from the sealing surface of the valve seat 801 due to its own weight and the sealing fails.

[0028] In this embodiment, the top of the lower valve stem 5 is provided with a supporting groove for supporting the ball 7, and the supporting base 6 is provided with a clamping groove for clamping the ball 7, so that it is convenient to install and limit the position of the ball 7. It is easy to understand that the above-mentioned arrangement of the ball 7 is only an option, not a limitation. In other embodiments, of course, other methods can be used to install and fix the ball 7, such as the ball 7 is embedded in the top of the lower valve stem 5.

[0029] The upper end of the valve body 1 is connected to a valve stem sealing assembly 4, and the specific form of the valve stem sealing assembly 4 is not limited. In this embodiment, a conventional box seal in the art can be used. A gap is left between the upper valve stem 3 and the valve stem sealing assembly 4 in the height direction, so that the upper valve stem 3 has a certain movable gap in the axial direction while it is driving, so as to avoid the situation that the ball 2 is pressed against each other when assembled, and further avoid the ball 2 being bent and deformed by force when pressed against each other, which causes the valve to fail to seal.

[0030] refer to Figure 1 , Figure 4 and Figure 5, and a valve seat assembly 8 is connected to one end of the flow channel of the valve body 1, the valve seat assembly 8 includes a valve seat 801, a sealing packing 802, a pressure ring 803 and a four-open ring 804 which are arranged in sequence along the direction away from the sphere 2, a limiting ring groove is provided on the valve body 1, the four-open ring 804 is installed in the limiting ring groove, the valve seat 801 is connected to the valve body 1 through a thread, and the four-open ring 804 is connected in the circumferential direction with a plurality of first screws 9 for pressing the valve seat 801, and a plurality of second screws 10 for pressing the pressure ring 803. In actual application, the first screws 9 and the second screws 10 are cross-arranged, that is, the adjacent two sides of any first screw 9 are the second screws 10, and the adjacent two sides of any second screw 10 are the first screws 9.

[0031] It is worth mentioning that the valve seat 801 is connected to the valve body 1 through a thread. Due to the gap in the thread itself, when the medium has a reverse force, the valve seat 801 will be pushed away from the sphere 2 by the medium, which is prone to sealing leakage. The several first screws 9 connected in the circumferential direction of the four open rings 804 solve this problem. After the several first screws 9 are tightened, they press on the valve seat 801 and press the valve seat 801 to ensure that the medium pressure cannot push the valve seat 801 away from the sphere 2. At this time, the medium pressure still acts on the valve body 1 through the valve seat 801 thread in most cases, the screws are subjected to less force, and the valve sealing reliability is high.

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

Claims

1. An easily adjustable large-caliber C-type ball valve, comprising a valve body (1) and a ball (2), wherein the upper end of the valve body (1) is rotatably connected to an upper valve stem (3), the lower end of the valve body (1) is fixedly connected to a lower valve stem (5), the upper end of the ball (2) is transmission-connected to the upper valve stem (3), the lower end of the ball (2) is rotatably connected to the lower valve stem (5), the upper end of the valve body (1) is connected to a valve stem sealing assembly (4), and one end of the flow channel of the valve body (1) is connected to a valve seat assembly (8), characterized in that: A threaded through hole is provided at the bottom of the sphere (2), a support base (6) is connected in the threaded through hole, a ball (7) is provided at the top of the lower valve stem (5), the support base (6) and the ball (7) abut against each other, so that the height of the sphere (2) relative to the lower valve stem (5) can be changed by changing the depth of the support base (6) screwed into the threaded through hole.

2. The easily adjustable large-diameter C-type ball valve according to claim 1 is characterized in that: The top of the lower valve stem (5) is provided with a supporting groove for supporting the ball (7), and the supporting base (6) is provided with a clamping groove for clamping the ball (7).

3. The easily adjustable large-diameter C-type ball valve according to claim 1 is characterized in that: The valve seat assembly (8) comprises a valve seat (801), a sealing packing (802), a pressure ring (803) and a four-open ring (804) which are arranged in sequence in a direction away from the sphere (2); a limiting ring groove for installing the four-open ring (804) is provided on the valve body (1); the valve seat (801) is connected to the valve body (1) via a thread; the four-open ring (804) is connected in a circumferential direction with a plurality of first screws (9) for pressing the valve seat (801) and a plurality of second screws (10) for pressing the pressure ring (803).

4. The easily adjustable large-diameter C-type ball valve according to any one of claims 1 to 3, characterized in that: A gap is left between the upper valve stem (3) and the valve stem sealing assembly (4) in the height direction.

5. The easily adjustable large-diameter C-type ball valve according to any one of claims 1 to 3, characterized in that: A grinding process hole (201) is provided on the top of the sphere (2), and the axis of the grinding process hole (201) passes through the center of the sphere (2).

6. The easily adjustable large-diameter C-type ball valve according to claim 5 is characterized in that: An eccentricity detection process surface (202) is provided on one side of the grinding process hole (201).

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