Integrated instrument ball valve

Abstract

The present invention relates to the technical field of ball valves, and discloses an integrated instrument ball valve, including a valve body and a handle, wherein both ends of the valve body are integrally provided with connecting pipes, a valve chamber is provided in the middle, and further includes: a valve stem, which is used to control the opening and closing of the ball valve, a valve seat assembly, which is used to keep the valve ball and the valve body in a sealed state, a packing group, which is used to keep the valve stem and the valve body in a sealed state, an upper disc spring assembly, which is used to make the packing group fit tightly with the valve body and the valve stem, and a gland, which is used to compress the upper disc spring assembly. The present invention can solve or at least alleviate the problems of the existing instrument ball valve having a complex structure and poor sealing performance, and improve the sealing performance of the instrument ball valve.

Description

Technical Field

[0001] The invention relates to the technical field of ball valves, and in particular to an integrated instrument ball valve. Background Art

[0002] Instrument ball valves play the role of flow regulation and flow cutoff in instrument piping systems. Adjusting the angle of the valve ball can change the opening area, achieve medium flow regulation, and meet the demand for precise flow regulation of the valve. Instrument ball valves are often used in conjunction with instruments and meters in system pipelines to play a role in data monitoring and feedback, and the reliability of ball valve sealing is the key to ensuring long-term and accurate monitoring of system pipeline pressure values.

[0003] The elastic compensation seal instrument ball valve is a new type of floating ball instrument ball valve. It uses elastic elements to load the seal to compensate for the seal pressure loss of the valve seal due to long-term fatigue wear, thermal expansion and contraction, material creep, external impact and other factors, so that the instrument ball valve can obtain reliable and continuous sealing. Generally, instrument ball valves are small-caliber valves with compact structures. Due to the need for elastic compensation structures, the structure is more complicated.

[0004] ‌For example, an instrument ball valve with good sealing performance, published as CN211649134U, comprises a valve body, a sphere and a valve stem, the lower end of the valve stem is arranged on the sphere through a key groove, the valve body comprises a left valve body and a right valve body, the left valve body and the right valve body are respectively provided with a left fixed step and a right fixed step, the left fixed step is provided with a left valve seat, the right fixed step is provided with a right valve seat, the sphere is cooperated and arranged between the left valve seat and the right valve seat, the left valve body and the right valve body are connected by a flange, a first slot is provided on the left valve seat, a first spring is provided in the first slot, a left sealing mechanism is provided on the first spring, a second slot is provided on the right valve seat, a second spring is provided in the second slot, and a right sealing mechanism is provided on the second spring. The utility model has a simple structure, and when connected with other pipelines, the connection has good sealing performance and is not prone to leakage.

[0005] However, although this solution ensures the seal between the valve seat and the valve ball, its structure is complex, and the valve body is a split structure, which makes assembly complicated. There is a risk of leakage at the joint between the left and right valve bodies, and when a gap appears between the left and right valve bodies, it will also affect the sealing between the valve seat and the valve ball. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art, solve or at least alleviate the problems of the existing instrument ball valve having a complex structure and poor sealing performance, and provide an integrated instrument ball valve.

[0007] To achieve the above object, the present invention provides the following technical solution: an integrated instrument ball valve, comprising a valve body and a handle, wherein both ends of the valve body are integrally provided with connecting pipes, a valve chamber is provided in the middle, and further comprising:

[0008] A valve stem, which is used to control the opening and closing of the ball valve. The valve stem is rotatably arranged on the valve body. A valve ball is integrally formed at the lower part of the valve stem. The valve ball is spherical and is located in the valve chamber. The valve ball is transversely provided with a first communication hole. The first communication hole is arranged corresponding to the communication pipe. The upper end of the valve stem extends out of the valve body and the fixed sleeve is provided with the handle;

[0009] A valve seat assembly is used to keep the valve ball and the valve body in a sealed state. The valve seat assembly is located in the valve chamber and between the valve stem and the valve body. The outer surface of the valve seat assembly is in sealing contact with the inner wall of the valve chamber. The inner surface of the valve seat assembly is in sealing contact with the outer surface of the valve ball. A second communication hole is transversely arranged in the middle of the valve seat assembly. The second communication hole is coaxially connected to the communication pipe.

[0010] A packing group, which is used to keep the valve stem and the valve body in a sealed state. The packing group is sleeved outside the valve stem and located above the valve seat assembly. The outer surface of the packing group is in sealing contact with the inner wall of the valve chamber, and the inner surface of the packing group is in sealing contact with the outer surface of the valve stem;

[0011] An upper disc spring assembly is used to make the packing group fit tightly with the valve body and the valve stem. The upper disc spring assembly is sleeved outside the valve stem and located above the packing group. The lower end of the upper disc spring assembly abuts against the packing group. The upper disc spring assembly includes a plurality of disc spring bodies arranged in a longitudinal array.

[0012] The pressure cover is used to compress the upper disc spring assembly. The pressure cover is threadedly sleeved on the valve body and is located above the upper disc spring assembly. The lower end of the pressure cover abuts against the upper disc spring assembly.

[0013] In order to further realize the present invention, the following technical solutions may be preferably selected:

[0014] Preferably, a pressing assembly is also included, and the pressing assembly includes:

[0015] An upper pressure plate, which is used to make the upper part of the valve seat assembly fit tightly with the upper part of the valve ball. The upper pressure plate is axially slidably sleeved on the valve stem and rotates with the valve stem. The upper pressure plate is located between the valve seat assembly and the packing group;

[0016] A lower pressure plate, which is used to make the lower part of the valve seat assembly fit closely with the lower part of the valve ball. The lower pressure plate is axially slidably sleeved on the valve stem and rotates with the valve stem. The lower pressure plate is located at the lower side of the valve seat assembly;

[0017] A pressure groove, wherein the pressure groove is annular, the width of the top of the pressure groove is greater than the width of the bottom, the middle of the pressure groove has a smooth transition, and the two pressure grooves are respectively located on the upper surface and the lower surface of the valve seat assembly;

[0018] The pressure strip is used to cooperate with the pressure groove to make the inner side of the valve seat assembly fit tightly to the valve ball. The pressure strips are arranged on the side of the upper pressure plate and the lower pressure plate facing the valve seat assembly, and the pressure strips are slidably embedded in the pressure groove.

[0019] Preferably, the pressing assembly further comprises:

[0020] An adjustment mechanism, which is used to adjust the tightness of the valve seat assembly and the valve ball, and the adjustment mechanism includes a clearance groove, two of which are respectively located on the upper surface and the lower surface of the valve seat assembly, and the length direction of the clearance groove is perpendicular to the flow direction of the ball valve;

[0021] The pressure strip includes three strips distributed circumferentially and arranged at intervals of ninety degrees; when the ball valve is in an open state, two of the strips are respectively embedded in the pressure grooves at the upper and lower ends of the valve seat assembly, and the other strip is located in the give way groove; when the ball valve is in a closed state, two of the strips are located in the give way groove, and the other strip is embedded in the pressure groove at the upper end of the valve seat assembly.

[0022] Preferably, the upper pressing plate and the lower pressing plate are both provided with a sinking area, and the sinking area is located on a side where the upper pressing plate and the lower pressing plate are provided with the pressure strips, and the sinking area is located in the area surrounded by the pressure strips.

[0023] Preferably, the pressing assembly further comprises:

[0024] The lower disc spring assembly is used to provide a certain buffer when the lower pressure plate hits the valve seat assembly. The lower disc spring assembly is sleeved on the valve stem and is located below the lower pressure plate. The upper and lower ends of the lower disc spring assembly hit the lower pressure plate and the bottom surface of the valve chamber respectively. The lower disc spring assembly includes a plurality of disc spring bodies arranged in a longitudinal array.

[0025] Preferably, a positioning component is also included, and the positioning component includes:

[0026] A positioning post, which is used to keep the valve seat assembly and the valve body in a relatively fixed position, the positioning post is laterally slidably sleeved on the valve seat assembly, and the diameter of one end of the positioning post located in the valve seat assembly is larger than the diameter of the first communicating hole;

[0027] A receiving hole, which is used to receive the positioning column during assembly, the receiving hole is located at one end of the first communicating hole, and the diameter of the receiving hole is larger than the diameter of the first communicating hole;

[0028] A positioning hole, which is used to limit the position of the positioning column after assembly, and the positioning hole is located on one side of the valve chamber;

[0029] When assembling the ball valve, the inner end of the positioning column is located in the accommodating hole, and the outer end of the positioning column is located in the valve seat assembly; after assembly, the outer end of the positioning column extends out of the valve seat assembly and is embedded in the positioning hole, and the inner end of the positioning column contacts the valve ball.

[0030] Preferably, the positioning assembly further comprises a limiting mechanism, which is used to limit the rotation position of the valve stem, and the limiting mechanism comprises:

[0031] A limit plate, which is fixedly embedded on the upper part of the valve body, a limit block is arranged on the upper surface of the limit plate, and the limit block is located just above the positioning hole;

[0032] The stopper is arranged on an upper part of one side of the valve stem adjacent to the accommodating hole, and the lower end of the stopper slides against the limiting plate.

[0033] Preferably, the stopper is longitudinally slidably disposed in the handle, a spring is disposed between the stopper and the handle, and the spring drives the stopper downward to press against the limit plate.

[0034] Preferably, the valve seat assembly comprises:

[0035] The valve seat bodies are two mirror-image-shaped valve seat bodies, the two valve seat bodies are respectively located at the upper end and the lower end of the valve chamber, and the two valve seat bodies abut against each other;

[0036] The support ring is used to make the two valve seat bodies fit tightly together. The two support rings are respectively located in the second connecting holes of the two valve seat bodies. One end of the support ring abuts against the inner wall of the valve chamber, and the other end abuts against the valve seat body.

[0037] Preferably, the packing group comprises:

[0038] A lower packing, wherein the top surface of the lower packing is an inclined surface which is lower outside and higher inside, and the outer wall of the lower packing is in contact with the inner wall of the valve chamber;

[0039] The upper packing is located above the lower packing. The bottom surface of the upper packing is a slope that is lower outside and higher inside. The bottom surface of the upper packing is sealingly and slidingly fitted with the top surface of the lower packing, and the inner wall of the upper packing is fitted with the outer wall of the valve stem.

[0040] The beneficial effects of the present invention are:

[0041] 1. The valve body of the present invention adopts an integrated design, has a simple structure, and can also ensure the sealing performance of the valve body.

[0042] 2. The present invention seals the valve ball through a box-shaped valve seat assembly, does not require system pressure to produce a seal, allows two-way flow, has virtually no dead zone, and is easy to clean and purify.

[0043] 3. The present invention adjusts the clamping state of the valve seat assembly by the upper and lower pressure plates of the clamping assembly. Under the premise of ensuring the sealing effect, the stress value in the middle area of ​​the valve seat assembly is made smaller than the yield stress of the valve seat assembly material, so that the valve seat assembly is not prone to fatigue and the service life is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural schematic diagram of the open state of the present invention.

[0045] Figure 2 It is a structural cross-sectional view of the present invention in an open state.

[0046] Figure 3 For the present invention Figure 2 Cross-sectional view at AA in the middle.

[0047] Figure 4 For the present invention Figure 2 Cross-sectional view at the middle BB.

[0048] Figure 5 It is a structural schematic diagram of the closed state of the present invention.

[0049] Figure 6 It is a structural cross-sectional view of the closed state of the present invention.

[0050] Figure 7 For the present invention Figure 6 Cross-sectional view at CC.

[0051] Figure 8 For the present invention Figure 6 Cross-sectional view at DD in the middle.

[0052] Fig. 9 It is a structural schematic diagram of the valve body of the present invention.

[0053] Fig.10 It is a structural cross-sectional view of the valve body of the present invention.

[0054] Fig.11 It is a schematic structural diagram of the valve stem and valve ball of the present invention.

[0055] Fig.12 It is a structural cross-sectional view of the valve stem and valve ball of the present invention.

[0056] Fig.13 It is a structural schematic diagram of the valve seat assembly of the present invention.

[0057] Fig.14 It is a structural cross-sectional view of the valve seat assembly of the present invention.

[0058] Fig.15 It is a structural schematic diagram of the lower pressing plate of the present invention.

[0059] Fig.16 It is a schematic structural diagram of the limiting plate and the limiting block of the present invention.

[0060] The accompanying drawings are marked as follows:

[0061] 1-valve body; 2-handle; 3-connecting pipe; 4-valve chamber; 5-valve stem; 6-valve ball; 7-first connecting hole; 8-valve seat assembly; 9-stuffing group; 10-second connecting hole; 11-disc spring body; 12-pressure cover; 13-upper pressure plate; 14-lower pressure plate; 15-pressure groove; 16-pressure strip; 17-bar body; 18-yield groove; 19-positioning column; 20-accommodating hole; 21-positioning hole; 22-limiting plate; 23-limiting block; 24-stopper; 801-valve seat body; 802-support ring; 901-lower packing; 902-upper packing. DETAILED DESCRIPTION

[0062] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0064] Embodiment 1

[0065] The elastic compensation seal instrument ball valve is a new type of floating ball instrument ball valve. It uses elastic elements to load the seal to compensate for the seal pressure loss of the valve seal due to long-term fatigue wear, thermal expansion and contraction, material creep, external impact and other factors, so that the instrument ball valve can obtain reliable and continuous sealing. Generally, instrument ball valves are small-caliber valves with compact structures. Due to the need for elastic compensation structures, the structure is more complicated.

[0066] Existing instrument ball valves have a complex structure. For ease of assembly, the valve body 1 is mostly a split structure. However, the split structure increases the leakage probability of the ball valve and is not suitable for high-pressure environments. The current market requires 10 years of zero leakage for instrument ball valves, and this type of split ball valve is even less suitable.

[0067] Reference Figures 1 to 14 An integrated instrument ball valve comprises a valve body 1 and a handle 2. Both ends of the valve body 1 are integrally provided with connecting pipes 3, a valve chamber 4 is provided in the middle, and the valve stem 5, a valve seat assembly 8, a packing group 9, an upper disc spring assembly and a gland 12;

[0068] The valve stem 5 is used to control the opening and closing of the ball valve. The valve stem 5 is rotatably arranged on the valve body 1. A valve ball 6 is integrally formed at the lower part of the valve stem 5. The valve ball 6 is spherical and is located in the valve chamber 4. The valve ball 6 is transversely provided with a first communication hole 7. The first communication hole 7 is arranged corresponding to the communication pipe 3. The upper end of the valve stem 5 extends out of the valve body 1 and is fixedly sleeved with a handle 2.

[0069] The valve seat assembly 8 is used to keep the valve ball 6 and the valve body 1 in a sealed state. The valve seat assembly 8 is located in the valve chamber 4 and between the valve stem 5 and the valve body 1. The outer surface of the valve seat assembly 8 is sealed and fitted with the inner wall of the valve chamber 4. The inner surface of the valve seat assembly 8 is sealed and fitted with the outer surface of the valve ball 6. A second communication hole 10 is transversely arranged in the middle of the valve seat assembly 8. The second communication hole 10 is coaxially connected to the communication pipe 3.

[0070] The packing group 9 is used to keep the valve stem 5 and the valve body 1 in a sealed state. The packing group 9 is sleeved outside the valve stem 5 and is located above the valve seat assembly 8. The outer surface of the packing group 9 is sealed against the inner wall of the valve chamber 4, and the inner surface of the packing group 9 is sealed against the outer surface of the valve stem 5.

[0071] The upper disc spring assembly is used to make the packing group 9 fit tightly with the valve body 1 and the valve stem 5. The upper disc spring assembly is sleeved outside the valve stem 5 and is located above the packing group 9. The lower end of the upper disc spring assembly abuts against the packing group 9. The upper disc spring assembly includes a plurality of disc spring bodies 11 arranged in a longitudinal array.

[0072] The pressure cap 12 is used to compress the upper disc spring assembly. The pressure cap 12 is threadedly sleeved on the valve body 1 and is located above the upper disc spring assembly. The lower end of the pressure cap 12 abuts against the upper disc spring assembly.

[0073] The valve seat assembly 8 includes a valve seat body 801 and a support ring 802;

[0074] In order to facilitate processing and manufacturing, the valve seat body 801 is provided in two mirror images, and the two valve seat bodies 801 are respectively located at the upper end and the lower end of the valve chamber 4, and the two valve seat bodies 801 abut against each other;

[0075] The support ring 802 is used to make the two valve seat bodies 801 fit tightly together. The two support rings 802 are respectively located in the second connecting holes 10 of the two valve seat bodies 801. One end of the support ring 802 abuts against the inner wall of the valve chamber 4, and the other end abuts against the valve seat body 801.

[0076] The packing group 9 includes a lower packing 901 and an upper packing 902 which are stacked vertically;

[0077] The top surface of the lower packing 901 is a slope that is lower outside and higher inside, and the outer wall of the lower packing 901 fits the inner wall of the valve chamber 4;

[0078] The upper packing 902 is located above the lower packing 901 . The bottom surface of the upper packing 902 is a slope that is lower outside and higher inside. The bottom surface of the upper packing 902 is sealingly and slidingly fitted with the top surface of the lower packing 901 , and the inner wall of the upper packing 902 is fitted with the outer wall of the valve stem 5 .

[0079] The packing group 9 adopts a two-piece structure, and the upper and lower packings 901 are radially expanded respectively through axial positive pressure, thereby achieving sealing. Compared with the one-piece annular packing, such a packing structure has a higher efficiency in force transmission in a limited space. After assembly, the stress value of the sealing surface formed by the outer wall of the upper packing 902 and the inner wall of the valve chamber 4 is σA, the stress value of the sealing surface formed by the bottom surface of the upper packing 902 and the top surface of the lower packing 901 is σB, and the stress value of the sealing surface formed by the inner wall of the lower packing 901 and the outer wall of the valve stem 5 is σC, σA<σB<σC. Such stress distribution can not only ensure the sealing effect between the packing group 9 and the valve stem 5, but also prevent the packing group 9 from deformation and cracking due to excessive stress.

[0080] Embodiment 2

[0081] The existing valve seat is transversely sealed and slidably arranged in the valve chamber 4, but its structure is complex and difficult to assemble. In the first embodiment of this scheme, the valve seat body 801 is fitted to the inner wall of the valve chamber 4, and the valve seat body 801 is pressed against the valve ball 6 by the support ring 802. However, after the valve seat body 801 is damaged, the movement amount is large, and a gap will appear between the valve seat body 801 and the inner wall of the valve chamber 4, causing leakage.

[0082] At the same time, the valve seat is made of non-metallic materials and is prone to fatigue failure. The existing valve seat is pressed against the valve ball 6 by a spring, and the single-side cross-section of the valve seat is equivalent to a cantilever structure. The cantilever will bend with the change of the medium pressure upstream of the ball valve. Practice has shown that its bending change is large, the valve seat is more prone to fatigue, and the service life is reduced.

[0083] Reference Figures 1 to 15 The integrated instrument ball valve further includes a clamping assembly, which includes an upper clamping plate 13, a lower clamping plate 14, a clamping groove 15 and a clamping strip 16;

[0084] The upper pressure plate 13 is used to make the upper part of the valve seat fit tightly with the upper part of the valve ball 6. The upper pressure plate 13 is axially slidably sleeved on the valve stem 5 and rotates with the valve stem 5. The upper pressure plate 13 is located between the valve seat assembly 8 and the packing group 9.

[0085] The lower pressing plate 14 is used to make the lower part of the valve seat fit closely with the lower part of the valve ball 6. The lower pressing plate 14 is axially slidably sleeved on the valve stem 5 and rotates with the valve stem 5. The lower pressing plate 14 is located at the lower side of the valve seat assembly 8;

[0086] The pressure groove 15 is annular, the width of the top of the pressure groove 15 is greater than the width of the bottom, the middle of the pressure groove 15 is smoothly transitioned, and the two pressure grooves 15 are respectively located on the upper surface and the lower surface of the valve seat assembly 8;

[0087] The pressure strip 16 is used to cooperate with the pressure groove 15 to make the inner side of the valve seat assembly 8 fit tightly against the valve ball 6. The upper pressure plate 13 and the lower pressure plate 14 are both provided with pressure strips 16 on the side facing the valve seat assembly 8, and the pressure strips 16 are slidably embedded in the pressure groove 15.

[0088] In order to ensure the stability of the position of the upper pressing plate 13 and the lower pressing plate 14, the upper pressing plate 13 and the lower pressing plate 14 are both provided with a sinking area, which is located on the side where the upper pressing plate 13 and the lower pressing plate 14 are provided with a pressure strip 16, and the sinking area is located in the area surrounded by the pressure strip 16.

[0089] The upper pressing plate 13 and the lower pressing plate 14 are tightly fitted to a section of the valve seat assembly 8 located outside the pressing groove 15 , and do not affect the turning deformation of a section of the valve seat assembly 8 located inside the pressing groove 15 .

[0090] The clamping assembly also includes a lower disc spring assembly, which is used to provide a certain buffer when the lower pressure plate 14 hits the valve seat assembly 8. The lower disc spring assembly is sleeved on the valve stem 5 and is located below the lower pressure plate 14. The upper and lower ends of the lower disc spring assembly respectively hit the lower pressure plate 14 and the bottom surface of the valve chamber 4. The lower disc spring assembly includes a plurality of disc spring bodies 11 arranged in a longitudinal array.

[0091] When the pressure strip 16 is embedded in the pressure groove 15, the valve seat body 801 is squeezed by the pressure strip 16, and a section of the valve seat body 801 located inside the pressure groove 15 is flipped and deformed downward, so that the inner side of the valve seat body 801 is tightly fitted to the valve ball 6, and a section of the valve seat body 801 located outside the pressure groove 15 is deformed outward, so that the outer side of the valve seat body 801 is tightly fitted to the inner wall of the valve chamber 4.

[0092] The valve seat body 801 deforms in both directions to ensure the sealing performance between the valve seat body 801 and the valve chamber 4 and the valve ball 6. The valve seat body 801 deforms from the middle, which reduces the maximum displacement of the valve seat body 801, making the stress value in the center area of ​​the valve seat body 801 less than the yield stress of the valve seat material, and the valve seat body 801 is not easy to fatigue, thereby increasing the service life.

[0093] In order to further reduce the fatigue of the valve seat body 801, the clamping assembly also includes an adjustment mechanism, which is used to adjust the tightness of the valve seat assembly 8 and the valve ball 6. The adjustment mechanism includes a clearance groove 18. The two clearance grooves 18 are respectively located on the upper surface and the lower surface of the valve seat assembly 8. The length direction of the clearance groove 18 is perpendicular to the flow direction of the ball valve.

[0094] The pressure strip 16 includes three strips 17 which are distributed circumferentially and arranged at intervals of 90 degrees; when the ball valve is in an open state, two of the strips 17 are respectively embedded in the pressure grooves 15 at the upper and lower ends of the valve seat assembly 8, and the other strip 17 is located in the make way groove 18; when the ball valve is in a closed state, two of the strips 17 are located in the make way groove 18, and the other strip 17 is embedded in the pressure groove 15 at the upper end of the valve seat assembly 8.

[0095] When the instrument ball valve is in the open state, the system pressure in the instrument ball valve does not act on the valve ball 6. At this time, the pressure grooves 15 at both ends of the valve seat assembly 8 are embedded with strips 17 to ensure the sealing between the valve seat assembly 8 and the valve chamber 4 and the valve ball 6; when the instrument ball valve is in the closed state, the valve ball 6 moves downstream, and the pressure groove 15 at the upper end of the valve seat assembly 8 is embedded with a strip 17. The sealing is achieved by the combined action of the extrusion of the strip 17 and the action of the medium. The greater the action of the medium, the better the sealing performance of the valve seat body 801 at the rear end. The valve seat body 801 at the front section is deformed by the extrusion of the strip 17, which can also ensure the sealing performance. Under the premise of ensuring the sealing performance, the valve seat body 801 will not be in a deformed state all the time, thereby improving the service life.

[0096] Embodiment 3

[0097] The existing valve seat is transversely sealed and slidably arranged in the valve chamber 4, and it will not rotate in the valve chamber 4. In this solution, in order to facilitate processing, the valve chamber 4 is usually in the shape of a circular hole. Because the valve seat assembly 8 is only fitted in the valve chamber 4, when the valve ball 6 rotates, the valve seat assembly 8 will rotate with the valve ball 6, reducing the flow rate of the instrument ball valve. In severe cases, the instrument ball valve will completely lose its function.

[0098] Therefore, refer to Figures 1 to 16 The integrated instrument ball valve further includes a positioning assembly, which includes a positioning column 19, a receiving hole 20 and a positioning hole 21;

[0099] The positioning column 19 is used to keep the valve seat assembly 8 and the valve body 1 in a relatively fixed position. The positioning column 19 is laterally slidably sleeved on the valve seat assembly 8. The diameter of one end of the positioning column 19 located in the valve seat assembly 8 is larger than the diameter of the first communication hole 7.

[0100] The receiving hole 20 is used to receive the positioning column 19 during assembly. The receiving hole 20 is located at one end of the first communicating hole 7. The diameter of the receiving hole 20 is greater than the diameter of the first communicating hole 7.

[0101] The positioning hole 21 is used to limit the position of the positioning column 19 after assembly, and the positioning hole 21 is located on one side of the valve chamber 4;

[0102] In order to prevent the receiving hole 20 from rotating to the positioning column 19 during use, causing the positioning column 19 to be separated from the positioning hole 21: the positioning assembly also includes a limiting mechanism, which is used to limit the rotation position of the valve stem 5, and the limiting mechanism includes a limiting plate 22 and a stopper 24;

[0103] The limit plate 22 is fixedly embedded on the upper part of the valve body 1, and a limit block 23 is arranged on the upper surface of the limit plate 22, and the limit block 23 is located directly above the positioning hole 21;

[0104] The stopper 24 is disposed on an upper portion of one side of the valve stem 5 adjacent to the accommodating hole 20 , and the lower end of the stopper 24 slides against the limiting plate 22 .

[0105] The stopper 24 is longitudinally slidably disposed in the handle 2 , and a spring is disposed between the stopper 24 and the handle 2 , and the spring drives the stopper 24 downward to the limit plate 22 .

[0106] When assembling the ball valve, the inner end of the positioning column 19 is located in the accommodating hole 20, and the outer end of the positioning column 19 is located in the valve seat assembly 8; after assembly, the outer end of the positioning column 19 extends out of the valve seat assembly 8 and is embedded in the positioning hole 21, and the inner end of the positioning column 19 contacts the valve ball 6; during use, the positioning column 19 positions the valve seat assembly 8 in the valve chamber 4 to prevent the valve seat assembly 8 from rotating with the valve ball 6 in the valve chamber 4, and limits the rotation angle of the valve stem 5 through the limiting mechanism to prevent the positioning column 19 from detaching from the positioning hole 21.

[0107] The above are only preferred specific implementation modes 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 according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An integrated instrument ball valve, comprising a valve body and a handle, wherein both ends of the valve body are integrally provided with connecting pipes, and a valve chamber is provided in the middle, characterized in that: Also includes: A valve stem, which is used to control the opening and closing of the ball valve. The valve stem is rotatably arranged on the valve body. A valve ball is integrally formed at the lower part of the valve stem. The valve ball is spherical and is located in the valve chamber. The valve ball is transversely provided with a first communication hole. The first communication hole is arranged corresponding to the communication pipe. The upper end of the valve stem extends out of the valve body and the fixed sleeve is provided with the handle; A valve seat assembly is used to keep the valve ball and the valve body in a sealed state. The valve seat assembly is located in the valve chamber and between the valve stem and the valve body. The outer surface of the valve seat assembly is in sealing contact with the inner wall of the valve chamber. The inner surface of the valve seat assembly is in sealing contact with the outer surface of the valve ball. A second communication hole is transversely arranged in the middle of the valve seat assembly. The second communication hole is coaxially connected to the communication pipe. A packing group, which is used to keep the valve stem and the valve body in a sealed state. The packing group is sleeved outside the valve stem and located above the valve seat assembly. The outer surface of the packing group is in sealing contact with the inner wall of the valve chamber, and the inner surface of the packing group is in sealing contact with the outer surface of the valve stem; An upper disc spring assembly is used to make the packing group fit tightly with the valve body and the valve stem. The upper disc spring assembly is sleeved outside the valve stem and located above the packing group. The lower end of the upper disc spring assembly abuts against the packing group. The upper disc spring assembly includes a plurality of disc spring bodies arranged in a longitudinal array. A gland, which is used to compress the upper disc spring assembly. The gland is threadedly sleeved on the valve body and is located above the upper disc spring assembly. The lower end of the gland abuts against the upper disc spring assembly. Also included is a clamping assembly, the clamping assembly comprising: An upper pressure plate, which is used to make the upper part of the valve seat assembly fit tightly with the upper part of the valve ball. The upper pressure plate is axially slidably sleeved on the valve stem and rotates with the valve stem. The upper pressure plate is located between the valve seat assembly and the packing group; A lower pressure plate, which is used to make the lower part of the valve seat assembly fit closely with the lower part of the valve ball. The lower pressure plate is axially slidably sleeved on the valve stem and rotates with the valve stem. The lower pressure plate is located at the lower side of the valve seat assembly; A pressure groove, wherein the pressure groove is annular, the width of the top of the pressure groove is greater than the width of the bottom, the middle of the pressure groove has a smooth transition, and the two pressure grooves are respectively located on the upper surface and the lower surface of the valve seat assembly; A pressure strip, which is used to cooperate with the pressure groove to make the inner side of the valve seat assembly closely fit the valve ball. The pressure strips are provided on the side of the upper pressure plate and the lower pressure plate facing the valve seat assembly, and the pressure strips are slidably embedded in the pressure groove; The clamping assembly also includes: An adjustment mechanism, which is used to adjust the tightness of the valve seat assembly and the valve ball, and the adjustment mechanism includes a clearance groove, two of which are respectively located on the upper surface and the lower surface of the valve seat assembly, and the length direction of the clearance groove is perpendicular to the flow direction of the ball valve; The pressure strip includes three strips distributed circumferentially and arranged at intervals of ninety degrees; when the ball valve is in an open state, two of the strips are respectively embedded in the pressure grooves at the upper and lower ends of the valve seat assembly, and the other strip is located in the give way groove; when the ball valve is in a closed state, two of the strips are located in the give way groove, and the other strip is embedded in the pressure groove at the upper end of the valve seat assembly.

2. The integrated instrument ball valve according to claim 1, characterized in that: The upper pressing plate and the lower pressing plate are both provided with a sinking area, and the sinking area is located on the side where the upper pressing plate and the lower pressing plate are provided with the pressure strips, and the sinking area is located in the area surrounded by the pressure strips.

3. The integrated instrument ball valve according to claim 1, characterized in that: The clamping assembly also includes: The lower disc spring assembly is used to provide a certain buffer when the lower pressure plate hits the valve seat assembly. The lower disc spring assembly is sleeved on the valve stem and is located below the lower pressure plate. The upper and lower ends of the lower disc spring assembly hit the lower pressure plate and the bottom surface of the valve chamber respectively. The lower disc spring assembly includes a plurality of disc spring bodies arranged in a longitudinal array.

4. The integrated instrument ball valve according to claim 1, characterized in that: Also included is a positioning component, the positioning component comprising: A positioning post, which is used to keep the valve seat assembly and the valve body in a relatively fixed position, the positioning post is laterally slidably sleeved on the valve seat assembly, and the diameter of one end of the positioning post located in the valve seat assembly is larger than the diameter of the first communicating hole; A receiving hole, which is used to receive the positioning column during assembly, the receiving hole is located at one end of the first communicating hole, and the diameter of the receiving hole is larger than the diameter of the first communicating hole; A positioning hole, which is used to limit the position of the positioning column after assembly, and the positioning hole is located on one side of the valve chamber; When assembling the ball valve, the inner end of the positioning column is located in the accommodating hole, and the outer end of the positioning column is located in the valve seat assembly; after assembly, the outer end of the positioning column extends out of the valve seat assembly and is embedded in the positioning hole, and the inner end of the positioning column contacts the valve ball.

5. The integrated instrument ball valve according to claim 4, characterized in that: The positioning assembly also includes a limiting mechanism, which is used to limit the rotation position of the valve stem, and the limiting mechanism includes: A limit plate, which is fixedly embedded on the upper part of the valve body, a limit block is arranged on the upper surface of the limit plate, and the limit block is located just above the positioning hole; The stopper is arranged on an upper part of one side of the valve stem adjacent to the accommodating hole, and the lower end of the stopper slides against the limiting plate.

6. The integrated instrument ball valve according to claim 5, characterized in that: The stopper is longitudinally slidably arranged in the handle, a spring is arranged between the stopper and the handle, and the spring drives the stopper downward to the limit plate.

7. The integrated instrument ball valve according to claim 1, characterized in that: The valve seat assembly comprises: The valve seat bodies are two mirror-image-shaped valve seat bodies, the two valve seat bodies are respectively located at the upper end and the lower end of the valve chamber, and the two valve seat bodies abut against each other; The support ring is used to make the two valve seat bodies fit tightly together. The two support rings are respectively located in the second connecting holes of the two valve seat bodies. One end of the support ring abuts against the inner wall of the valve chamber, and the other end abuts against the valve seat body.

8. The integrated instrument ball valve according to claim 1, characterized in that: The packing group comprises: A lower packing, wherein the top surface of the lower packing is an inclined surface which is lower outside and higher inside, and the outer wall of the lower packing is in contact with the inner wall of the valve chamber; The upper packing is located above the lower packing. The bottom surface of the upper packing is a slope that is lower outside and higher inside. The bottom surface of the upper packing is sealingly and slidingly fitted with the top surface of the lower packing, and the inner wall of the upper packing is fitted with the outer wall of the valve stem.

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