Ball valve with online maintenance and seat adjustment lock

Abstract

The application discloses a ball valve with online maintenance and valve seat adjusting locking, which comprises a valve ball, a valve body and a valve cover, the valve cover is arranged on the valve body, the valve ball is rotationally arranged in the valve body, two valve seat assemblies are arranged in the valve body and are located on the two sides of the valve ball, a worm assembly is rotationally arranged on the valve body, the valve seat assembly comprises a valve seat body and a valve seat nut, the valve seat nut and the valve seat body are matched together through thread connection, and the worm assembly and a worm wheel surface of the valve seat nut are engaged together. The ball valve has the beneficial effects that the valve seat body can be moved by only rotating the worm assembly, the adjusting and locking operation of the valve seat body is realized, online maintenance is realized, and the operation is convenient and fast.

Description

Technical Field

[0001] This invention relates to the field of valve equipment, and more particularly to a ball valve with online maintenance and valve seat adjustment locking. Background Technology

[0002] A ball valve is a rotary valve primarily used for shutting off fluid flow in pipelines. Fixed ball valves, due to their excellent sealing performance and extremely low flow resistance, have become one of the most widely used valve types, primarily in industries such as petrochemicals, fluid transportation, and water conservancy and hydropower. Valve reliability is crucial, and there are also higher requirements for valve maintainability and operability.

[0003] The structure of the top-mounted fixed ball valve is shown in patent publication document CN222910833U. The valve disclosed in this document uses a threaded valve seat structure. The valve seat is pre-tightened and disassembled by rotating the valve seat nut. When maintaining this type of valve, the rotation of the valve seat nut is required when disassembling and assembling the ball and the valve seat. Furthermore, the valve seat pre-tightening adjustment can only be completed by removing the valve cover. Therefore, maintenance is relatively difficult and troublesome, and the maintenance cycle is also relatively long. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a ball valve with online maintenance and valve seat adjustment and locking. Simply rotating the worm gear assembly moves the valve seat, thereby enabling the valve seat adjustment and locking operation, achieving online maintenance, and making the operation convenient and quick.

[0005] The technical solution adopted in this invention is as follows:

[0006] A ball valve with online maintenance and valve seat adjustment locking includes a valve ball, a valve body, and a valve cover. The valve cover is disposed on the valve body, and the valve ball is rotatably disposed in the valve body. Two valve seat assemblies are disposed in the valve body, with the two valve seat assemblies located on both sides of the valve ball. The valve valve also includes a worm gear assembly, which is rotatably disposed on the valve body. Each valve seat assembly includes a valve seat body and a valve seat nut. The valve seat nut and the valve seat body are connected by a threaded connection, and the worm gear assembly meshes with the worm wheel surface of the valve seat nut.

[0007] In this type of ball valve, valve seat assemblies are provided on both sides of the valve ball. The valve seat assembly mainly includes a valve seat body and a valve seat nut. The valve seat body and the valve seat nut are connected by a threaded connection. The worm gear assembly meshes with the worm wheel face of the valve seat nut. When the worm rotates, it can drive the valve seat nut to rotate. The rotation of the valve seat nut can drive the valve seat body to move relative to the valve seat nut. Therefore, in this type of ball valve, only the rotation of the worm gear assembly is needed to drive the valve seat body to move, thereby realizing the adjustment and locking operation of the valve seat body. At the same time, since the worm gear assembly is installed on the valve body, it can be turned without disassembling the valve cover and valve body, realizing online maintenance and making the operation convenient and quick.

[0008] In summary, simply rotating the worm gear assembly is enough to move the valve seat body, thereby enabling the adjustment and locking of the valve seat body, achieving online maintenance, and making the operation convenient and quick.

[0009] Optionally, the valve seat assembly further includes a return spring and a spring seat, the spring seat being sleeved on the valve seat body, the return spring being disposed inside the spring seat, one end of the return spring abutting against the spring seat, and the other end abutting against the valve body.

[0010] Optionally, the valve seat assembly further includes an O-ring and a valve seat seal ring, both of which are disposed on the valve seat body.

[0011] Optionally, the worm gear assembly includes a rotating shaft and a worm body. The worm body is connected to the rotating shaft via a key. A retaining ring is installed on the rotating shaft via a fastening screw, and retaining rings are provided on both sides of the worm body.

[0012] Optionally, the worm gear assembly further includes a bearing and a friction pad, the friction pad being disposed in a groove in the valve body and abutting against one end of the rotating shaft.

[0013] The friction pad and bearing are used to make the rotating shaft rotate more stably. The connection port of the rotating shaft is located outside the valve body and is used to connect to equipment such as wrenches.

[0014] Optionally, the worm gear assembly further includes a gland, mounting screws, and a gasket. The gland is mounted on the valve body by the mounting screws and abuts against one end of the rotating shaft. The gasket is located between the gland and the valve body. A thrust washer is fitted on the valve body, and an O-ring is provided between the valve cover and the rotating shaft.

[0015] Optionally, it also includes a valve stem, which is disposed on the valve ball, and an O-ring and packing are provided between the valve stem and the valve cover.

[0016] Optionally, a connecting disc is provided at one end of the valve cover, and the connecting disc is in close contact with the packing.

[0017] Optionally, the valve body and valve cover are detachably fitted together by bolts and nuts, and a sealing gasket is provided between the valve cover and the valve body.

[0018] In this type of ball valve, the valve seat body undergoes surface hardening treatment, such as nitriding, chromium plating, or nickel-phosphorus plating, to improve surface hardness and corrosion resistance, preventing thread seizing and rust-induced malfunctions. At the same time, the valve seat body is finally lubricated with a nano-lubricating coating, which effectively reduces the thread engagement friction of the valve seat nut and increases transmission efficiency.

[0019] The valve seat nut is made of corrosion-resistant metal material to prevent rust and jamming during use. It is nitrided or quenched to improve hardness and increase wear resistance. Finally, the valve seat nut is lubricated with a nano-lubricating coating to reduce the thread engagement friction of the valve seat nut and the friction between the valve seat nut and the spring seat when the valve seat nut rotates, thereby increasing transmission efficiency.

[0020] The main function of the worm gear is to transmit input torque. This part is made of high-strength and corrosion-resistant metal material. The surface is nitrided or quenched to improve hardness and increase wear resistance. At the same time, the surface is finally coated with a nano-lubricating coating to reduce friction with the valve seat nut and increase transmission efficiency.

[0021] The function of the rotating shaft is to directly apply input force to the part, so it is made of high-strength alloy steel and the surface is coated with hardened and corrosion-resistant coatings, such as nitriding, nickel-phosphorus plating, and chromium plating, to improve the service life of the rotating shaft.

[0022] The bearing is made of stainless steel and PTFE composite material, and the inner ring of the bearing is coated with PTFE, which has the advantages of low friction and low loss. The bearing thickness is 1.5 to 2.5 mm, which saves installation space and has a compact structure.

[0023] Both the friction pad and the thrust pad are made of PTFE material, which has a low coefficient of friction and extremely high corrosion resistance, effectively reducing the friction and scratch risk of the rotating shaft.

[0024] The beneficial effects of this invention are: simply rotating the worm gear assembly is enough to move the valve seat body, thereby realizing the adjustment and locking operation of the valve seat body, achieving online maintenance, and making the operation convenient and quick. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0026] Figure 1 This is a simplified structural diagram of a ball valve with online maintenance and valve seat adjustment locking.

[0027] Figure 2 yes Figure 1 A simplified cross-sectional diagram along the AA direction;

[0028] Figure 3 yes Figure 2 A simplified enlarged diagram of point B in the middle;

[0029] Figure 4 yes Figure 1 A simplified structural diagram at point D;

[0030] Figure 5 This is a simplified cross-sectional diagram of a ball valve with online maintenance and seat adjustment locking.

[0031] Figure 6 This is a simplified structural diagram of the valve seat assembly;

[0032] Figure 7 yes Figure 5 A schematic diagram showing the state of the worm gear at point C when it rotates counterclockwise.

[0033] Figure 8 yes Figure 5 A schematic diagram showing the state of the worm gear at point C when it rotates clockwise.

[0034] The figures are labeled as follows: 1. Valve body; 2. Valve cover; 3. Valve ball; 4. Valve seat assembly; 4A. Valve seat body; 4B. Valve seat seal ring; 4C. Return spring; 4D. Valve seat nut; 4E. Spring seat; 4F. O-ring; 5. Valve stem; 6. Worm gear assembly; 6A. Rotating shaft; 6B. Worm gear body; 6C. Friction pad; 6D. Bearing; 6E. Retaining ring; 6F. Fastening screw; 6G. Key; 6H. Thrust washer; 6J. O-ring seal; 6K. Gasket; 6L. Mounting screw; 6M. Gland; 7. Connecting disc; 8. Sealing gasket; 9. Packing; 10. Stud; 11. Nut; 12. O-ring seal. Detailed Implementation

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0036] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0037] 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, and therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] As attached Figure 1 ~Appendix Figure 6 As shown, a ball valve with online maintenance and valve seat adjustment locking includes a valve ball 3, a valve body 1, and a valve cover 2. The valve cover 2 is disposed on the valve body 1, and the valve ball 3 is rotatably disposed inside the valve body 1. Two valve seat assemblies 4 are disposed inside the valve body 1, and the two valve seat assemblies 4 are respectively located on both sides of the valve ball 3. It also includes a worm gear assembly 6, which is rotatably disposed on the valve body 1. The valve seat assembly 4 includes a valve seat body 4A and a valve seat nut 4D. The valve seat nut 4D and the valve seat body 4A are connected together by a threaded connection. The worm gear assembly 6 meshes with the worm wheel surface of the valve seat nut 4D.

[0039] In this type of ball valve, valve seat assemblies 4 are provided on both sides of the valve ball 3. The valve seat assembly 4 mainly includes a valve seat body 4A and a valve seat nut 4D. The valve seat body 4A and the valve seat nut 4D are connected by a threaded connection. The worm gear assembly 6 meshes with the worm wheel surface of the valve seat nut 4D. When the worm rotates, it can drive the valve seat nut 4D to rotate. The rotation of the valve seat nut 4D can drive the valve seat body 4A to move relative to the valve seat nut 4D. Therefore, in this type of ball valve, only the rotation of the worm gear assembly 6 is needed to drive the valve seat body 4A to move, thereby realizing the adjustment and locking operation of the valve seat body 4A. At the same time, since the worm gear assembly 6 is installed on the valve body 1, the worm gear assembly 6 can be turned without disassembling the valve cover 2 and the valve body 1, realizing online maintenance and making the operation convenient and quick.

[0040] In summary, simply rotating the worm gear assembly 6 moves the valve seat 4A, thereby achieving the adjustment and locking operation of the valve seat 4A. This enables online maintenance and is convenient and quick to operate. Disassembly and installation of the valve seat are very labor-saving, and no special tools are required for disassembly.

[0041] As attached Figure 1 ~Appendix Figure 6 As shown, the valve seat assembly 4 also includes a return spring 4C and a spring seat 4E. The spring seat 4E is sleeved on the valve seat body 4A, and the return spring 4C is disposed inside the spring seat 4E. One end of the return spring 4C abuts against the spring seat 4E, and the other end abuts against the valve body 1.

[0042] As attached Figure 1 ~Appendix Figure 6 As shown, the valve seat assembly 4 also includes an O-ring and a valve seat sealing ring 4B, both of which are disposed on the valve seat body 4A.

[0043] As attached Figure 1 ~Appendix Figure 6 As shown, the worm gear assembly 6 includes a rotating shaft 6A and a worm body 6B. The worm body 6B is connected to the rotating shaft 6A via a key 6G. A retaining ring 6E is installed on the rotating shaft 6A via a fastening screw 6F, and retaining rings 6E are provided on both sides of the worm body 6B.

[0044] As attached Figure 1 ~Appendix Figure 6 As shown, the worm gear assembly 6 also includes a bearing 6D and a friction pad 6C. The friction pad 6C is disposed in the groove of the valve body 1 and abuts against one end of the rotating shaft 6A.

[0045] The friction pad 6C and bearing 6D are used to make the rotation of the rotating shaft 6A more stable. The connection port of the rotating shaft 6A is located outside the valve body 1. The connection port of the rotating shaft 6A is used to connect to equipment such as wrenches.

[0046] As attached Figure 1~Appendix Figure 6 As shown, the worm gear assembly 6 also includes a pressure cap 6M, a mounting screw 6L, and a gasket 6K. The pressure cap 6M is mounted on the valve body 1 by the mounting screw 6L. The pressure cap 6M abuts against one end of the rotating shaft 6A. The gasket 6K is located between the pressure cap 6M and the valve body 1. A thrust washer 6H is fitted on the valve body 1. An O-ring is provided between the valve cover 2 and the rotating shaft 6A.

[0047] As attached Figure 1 ~Appendix Figure 6 As shown, it also includes a valve stem 5, which is mounted on the valve ball 3. An O-ring and packing 9 are provided between the valve stem 5 and the valve cover 2.

[0048] As attached Figure 1 ~Appendix Figure 6 As shown, a connecting disc 7 is provided at one end of the valve cover 2, and the connecting disc 7 is in close contact with the packing 9.

[0049] As attached Figure 1 ~Appendix Figure 6 As shown, the valve body 1 and the valve cover 2 are detachably fitted together by bolts and nuts 11, and a sealing gasket 8 is provided between the valve cover 2 and the valve body 1.

[0050] Appendix Figure 4 The two spiral arrows indicate that the axis of rotation can rotate in the two directions mentioned above.

[0051] In this type of ball valve, the valve seat body 4A is surface hardened, such as nitriding, chrome plating, nickel-phosphorus plating, etc., to improve surface hardness and corrosion resistance, and prevent thread seizing and rust-induced failures. At the same time, the valve seat body 4A is finally lubricated with a nano-lubricating coating, which effectively reduces the thread engagement friction of the valve seat nut 4D and increases transmission efficiency.

[0052] The valve seat nut 4D is made of corrosion-resistant metal material to prevent rust and jamming during use. It is nitrided or quenched to improve hardness and wear resistance. Finally, the valve seat nut 4D is lubricated with a nano-lubricating coating to reduce the thread engagement friction and the friction between the valve seat nut 4D and the spring seat 4E when the valve seat nut 4D rotates, thereby increasing transmission efficiency.

[0053] The main function of the worm gear body 6B is to transmit the input torque. This part is made of high-strength corrosion-resistant metal material. The surface is nitrided or quenched to improve hardness and increase wear resistance. At the same time, the surface is finally coated with a nano-lubricating coating to reduce the friction with the valve seat nut 4D and increase the transmission efficiency.

[0054] The function of the rotating shaft 6A is to directly apply input force to this part. Therefore, it is made of high-strength alloy steel and the surface is coated with hardened and corrosion-resistant coatings, such as nitriding, nickel-phosphorus plating, and chromium plating, to improve the service life of the rotating shaft 6A.

[0055] Bearing 6D is made of stainless steel and PTFE composite material. The inner ring of bearing 6D is coated with PTFE, which has the advantages of low friction and low loss. The thickness of bearing 6D is 1.5 to 2.5 mm, which saves installation space and has a compact structure.

[0056] Both friction pad 6C and thrust pad 6H are made of PTFE material, which has a low coefficient of friction and extremely high corrosion resistance, effectively reducing the friction and scratch risk of rotating shaft 6A.

[0057] Combined with appendix Figure 7 and appendix Figure 8 As shown in the attached diagram, the working process of this ball valve is explained in detail. First, the valve seat nut 4D is rotated until it is flush with the end face of the valve seat. Then, the valve seat assembly 4 is installed into the valve body 1. This state is shown in the attached diagram. Figure 7 As shown in the diagram, the valve ball 3 is then installed into the valve body 1, and then the worm gear assembly 6 is installed into the valve body 1. When the valve seat is pre-tightened, the worm gear is rotated clockwise to tighten the valve seat nut 4D (i.e., as shown in the attached diagram). Figure 8 (as shown in the diagram), and compress the spring to form an initial preload, so that the valve seat and the ball are sealed. See the details after the valve seat spring is preloaded. After the preload is completed, the worm gear itself locks, fixing the valve seat nut 4D. It will not loosen due to vibration, resulting in insufficient valve seat preload and leakage.

[0058] To disassemble, turn the worm gear counterclockwise to loosen the valve seat nut 4D, retract the valve seat to the bottom, lift out the ball, and then remove the valve seat assembly 4 to complete the disassembly. During the above process, if it is necessary to adjust the valve seat preload after assembly, simply rotate the connecting shaft externally to adjust the preload without disassembling any parts.

[0059] The above-described embodiments only illustrate some aspects of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A ball valve with online maintenance and valve seat adjustment locking, comprising a valve ball, a valve body, and a valve cover, wherein the valve cover is disposed on the valve body, the valve ball is rotatably disposed within the valve body, and two valve seat assemblies are disposed within the valve body, the two valve seat assemblies being respectively located on both sides of the valve ball, characterized in that, It also includes a worm gear assembly, which is rotatably mounted on the valve body. The valve seat assembly includes a valve seat body and a valve seat nut, which is threaded together with the valve seat body. The worm gear assembly meshes with the worm wheel surface of the valve seat nut.

2. A ball valve with online maintenance and seat adjustment locking according to claim 1, characterized in that, The valve seat assembly also includes a return spring and a spring seat. The spring seat is sleeved on the valve seat body, and the return spring is disposed inside the spring seat. One end of the return spring abuts against the spring seat, and the other end abuts against the valve body.

3. A ball valve with online maintenance and valve seat adjustment locking according to claim 1, characterized in that, The valve seat assembly also includes an O-ring and a valve seat sealing ring, both of which are disposed on the valve seat body.

4. A ball valve with online maintenance and valve seat adjustment locking according to claim 1, characterized in that, The worm gear assembly includes a rotating shaft and a worm body. The worm body is connected to the rotating shaft by a key. A retaining ring is installed on the rotating shaft by a fastening screw, and retaining rings are provided on both sides of the worm body.

5. A ball valve with online maintenance and seat adjustment locking according to claim 4, characterized in that, The worm gear assembly also includes a bearing and a friction pad, the friction pad being disposed in a groove in the valve body and abutting against one end of the rotating shaft.

6. A ball valve with online maintenance and valve seat adjustment locking according to claim 4, characterized in that, The worm gear assembly also includes a pressure cap, mounting screws, and a gasket. The pressure cap is mounted on the valve body by the mounting screws and abuts against one end of the rotating shaft. The gasket is located between the pressure cap and the valve body. A thrust washer is fitted on the valve body, and an O-ring is provided between the valve cover and the rotating shaft.

7. A ball valve with online maintenance and valve seat adjustment locking according to claim 1, characterized in that, It also includes a valve stem, which is disposed on the valve ball, and an O-ring and packing are provided between the valve stem and the valve cover.

8. A ball valve with online maintenance and seat adjustment locking according to claim 7, characterized in that, A connecting disc is provided at one end of the valve cover, and the connecting disc is in close contact with the packing.

9. A ball valve with online maintenance and valve seat adjustment locking according to claim 1, characterized in that, The valve body and valve cover are detachably fitted together by bolts and nuts.

10. A ball valve with online maintenance and seat adjustment locking according to claim 1, characterized in that, The valve seat is surface hardened and coated with a nano-lubricating coating. The valve seat nut is nitrided or quenched and coated with a nano-lubricating coating.

Images