Floating ball valve with pre-tightening function for petrochemical industry

Abstract

The invention discloses a floating ball valve with a pre-tightening function for petrochemical engineering, and relates to the field of ball valves.The floating ball valve comprises a valve body with liquid ports formed in the two ends, a ball body is arranged in the valve body, a through groove matched with the liquid ports is formed in the ball body, and a valve rod connected with the ball body is arranged at the top of the valve body; sealing washers located between the inner wall of the valve body and the ball body are arranged on the two sides of the inner wall of the valve body. According to the floating ball valve with the pre-tightening function for the petrochemical industry, through mutual cooperation of a pre-tightening ring, a pressed ring, a pre-tightening spring and a driving unit, pre-tightening force can be applied to a sealing gasket during initial adjustment of the floating ball valve, so that abrasion compensation is automatically conducted during follow-up abrasion of a sealing surface, and the sealing surface is prevented from being damaged. Therefore, the good sealing state between the ball body and the sealing gasket can be effectively guaranteed all the time, meanwhile, medium leakage can be effectively prevented, and the sealing reliability of the valve under the complicated working condition of petrochemical engineering is improved.

Description

Technical Field

[0001] The invention relates to ball valve technology, in particular to a floating ball valve with a pre-tightening function for petrochemical industry. Background Art

[0002] In the petrochemical industry, floating ball valves, as a crucial control component, are widely used in various fluid conveying and control piping systems. Floating ball valves open and close through the rotation of the ball, and their sealing performance directly impacts the safe and stable operation of the system. However, in actual petrochemical operating conditions, the media often exhibit high temperatures, high pressures, and strong corrosiveness, and the system experiences significant pressure and temperature fluctuations during operation, placing extremely high demands on the performance of floating ball valves. Existing floating ball valves face numerous problems during long-term use. Firstly, petrochemical media may contain particulate impurities. During the flow of the media, these particles can scour and abrade the valve's sealing surface. Furthermore, high-temperature and high-pressure operating conditions can cause thermal deformation and creep of the sealing surface material, further exacerbating wear. Once the sealing surface is worn, its sealing performance deteriorates dramatically, leading to media leakage. Since the media used in petrochemical production are often flammable, explosive, or toxic and hazardous substances, media leakage not only results in a significant waste of resources but can also cause serious safety incidents such as fires, explosions, and poisoning, posing a significant threat to human life and the ecological environment. On the other hand, existing floating ball valves lack an effective preload adjustment mechanism. In actual operating conditions, medium parameters such as pressure, temperature, and flow rate can vary significantly across different production stages and pipeline locations. However, after installation and commissioning, the sealing pressure ratio of traditional floating ball valves is essentially fixed, making it difficult to dynamically adjust the sealing pressure ratio based on actual operating conditions. When operating conditions deteriorate, such as a sudden increase in pressure, the fixed sealing pressure ratio may not meet the sealing requirements, leading to an increased risk of leakage. Conversely, when operating conditions are relatively mild, excessively high sealing pressure ratios can accelerate wear on the sealing surface and shorten the valve's service life. Therefore, existing floating ball valves cannot meet the petrochemical industry's stringent requirements for valve sealing reliability and stability. There is an urgent need to design a floating ball valve with a preload function that can effectively address these issues. Summary of the Invention

[0003] The object of the present invention is to provide a floating ball valve with a pre-tightening function for petrochemical industry to solve the above-mentioned deficiencies in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a floating ball valve with a pre-tightening function for use in the petrochemical industry, comprising a valve body with liquid ports at both ends, a sphere disposed within the valve body, the sphere having a through-groove formed therein to match the liquid port, a valve stem connected to the sphere disposed at the top of the valve body, and sealing gaskets disposed on both sides of the inner wall of the valve body between the inner wall of the valve body and the sphere; Both ends of the inner wall of the valve body are provided with annular grooves, the inner side surfaces of the annular grooves are slidably connected to a pressure ring, the sealing gasket is arranged on the pressure ring, the inner wall of the valve body is provided with a pre-tightening groove, the inner side surface of the pre-tightening groove is slidably connected to a pre-tightening ring, a pre-tightening spring is arranged between the pre-tightening ring and the pressure ring, a driving unit is arranged on the outside of the pre-tightening ring, the driving unit is used to drive the pre-tightening ring and the pre-tightening spring to apply a pre-tightening force to the pressure ring, so that the sealing gasket abuts against the surface of the sphere.

[0005] Furthermore, the valve body is composed of two components, and the two components are connected and fixed by bolts and nuts.

[0006] Furthermore, the drive unit includes a plurality of circular grooves equidistantly distributed in a circular ring shape, the inner side surface of the circular groove is slidingly connected to an internal threaded tube, the internal threaded tube is fixedly connected to the pre-tightening ring, the inner side surface of the internal threaded tube is threadedly connected to an adjusting screw, a driving gear is fixedly installed on the outside of the adjusting screw, both sides of the valve body are rotatably connected to control gear rings, and all the driving gears are engaged with the control gear rings.

[0007] Furthermore, a ring sleeve is installed at the end of the control gear ring, and the inner side of the ring sleeve is slidably connected to the drive sleeve. The inner side of the ring sleeve is circular and has several guide straight grooves equidistantly opened. The side of the ring sleeve is installed with a guide block adapted to the guide straight groove.

[0008] Furthermore, a return spring is installed between the guide block and the inner wall of the guide straight groove away from the sphere, a receiving groove is provided on the surface of the valve body, and a plurality of positioning grooves are equidistantly provided in a circular ring shape on the side of the receiving groove close to the sphere, and a plurality of positioning strips adapted to the positioning grooves are installed on the inner wall of the drive sleeve.

[0009] Furthermore, the width of the positioning strip is smaller than the width of the accommodating groove.

[0010] Furthermore, the sealing gasket includes an initial sealing portion and a resealing portion, the initial sealing portion is provided with an embedding protrusion, the end of the pressure ring is provided with an embedding groove, and the shape and size specifications of the embedding protrusion are adapted to the embedding groove.

[0011] Furthermore, a re-pressure ring is slidably connected to the inner side surface of the pre-tightening groove, and the position of the re-pressure ring is adapted to the re-sealing portion.

[0012] Furthermore, a plurality of pressure guide grooves are provided on the outer side surface of the pressure ring, and a pressure block adapted to the pressure guide groove is installed on the surface of the compound pressure ring. A buffer spring is installed between the side of the pressure block close to the sphere and the inner wall of the pressure guide groove, and the pre-tightening spring is fixedly connected between the pre-tightening ring and the compound pressure ring.

[0013] Furthermore, the deformation critical force value of the preload spring is greater than the deformation critical force value of the buffer spring.

[0014] Compared with the prior art, the present invention provides a floating ball valve with a pre-tightening function for petrochemical industry, which has the following beneficial effects: 1. This floating ball valve with a pre-tightening function for petrochemical industry can apply pre-tightening force to the sealing gasket during the initial adjustment of the floating ball valve through the mutual cooperation between the pre-tightening ring, pressure ring, pre-tightening spring and drive unit, so that wear compensation can be automatically performed when the sealing surface wears subsequently, thereby effectively ensuring that a good sealing state is always maintained between the ball and the sealing gasket. At the same time, it can also effectively prevent medium leakage, thereby improving the sealing reliability of the valve under complex working conditions in the petrochemical industry.

[0015] 2. The floating ball valve with pre-tightening function for petrochemical use, through the mutual cooperation between the pressure-reinforcing ring, the pressure guide groove, the pressure block and the buffer spring, can be used in special scenarios. The pressure ring can be used to squeeze the initial sealing part so that it is in close contact with the surface of the ball, and the pressure-reinforcing ring can be used to apply pressure to the secondary sealing part so that it is in close contact with the surface of the ball. In this way, two seals can be applied inside the valve body, making the ball valve more sealed and meeting the needs of different usage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention; Figure 2 A schematic diagram of the overall internal structure provided by an embodiment of the present invention; Figure 3 The embodiment of the present invention provides Figure 2 A in the middle is an enlarged structural diagram; Figure 4 The embodiment of the present invention provides Figure 2 The enlarged structural diagram at B in the middle; Figure 5A schematic diagram of a partial cross-sectional structure of a valve body provided in an embodiment of the present invention; Figure 6 A schematic diagram of a partial longitudinal cross-sectional structure of a valve body provided by an embodiment of the present invention; Figure 7 The embodiment of the present invention provides Figure 6 Enlarged structural diagram at point C in the middle.

[0018] Description of reference numerals: 1. Valve body; 101. Liquid port; 102. Ball; 103. Through groove; 104. Valve stem; 2. Sealing gasket; 201. Initial sealing part; 202. Resealing part; 203. Embedded protrusion; 21. Ring groove; 22. Pressure ring; 23. Preload ring; 24. Preload spring; 3. Internal threaded tube; 31. Adjusting screw; 32. Drive gear; 33. Control gear ring; 4. Ring sleeve; 41. Drive sleeve; 42. Guide straight groove; 43. Guide block; 44. Return spring; 45. Accommodating groove; 46. Positioning groove; 47. Positioning strip; 5. Embedded groove; 6. Re-pressure ring; 61. Pressure guide groove; 62. Pressure block; 63. Buffer spring. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] Example 1: See also Figure 1-Figure 5 A floating ball valve with a pre-tightening function for use in the petrochemical industry comprises a valve body 1 with liquid ports 101 at both ends. A ball 102 is disposed within the valve body 1. The ball 102 has a through groove 103 that matches the liquid port 101. A valve stem 104 connected to the ball 102 is disposed at the top of the valve body 1. Sealing gaskets 2 are disposed on both sides of the inner wall of the valve body 1 between the inner wall of the valve body 1 and the ball 102. Both ends of the inner wall of the valve body 1 are provided with an annular groove 21, and the inner side surface of the annular groove 21 is slidably connected to a pressure ring 22. The sealing gasket 2 is arranged on the pressure ring 22. The inner wall of the valve body 1 is provided with a pre-tightening groove, and the inner side surface of the pre-tightening groove is slidably connected to a pre-tightening ring 23. A pre-tightening spring 24 is provided between the pre-tightening ring 23 and the pressure ring 22. A driving unit is provided on the outside of the pre-tightening ring 23, and the driving unit is used to drive the pre-tightening ring 23 and the pre-tightening spring 24 to apply a pre-tightening force to the pressure ring 22, so that the sealing gasket 2 abuts against the surface of the ball 102.

[0021] The valve body 1 is composed of two components, and the two components are connected and fixed by bolts and nuts.

[0022] In this embodiment, the driving unit includes a plurality of circular grooves equidistantly distributed in a circular ring shape, the inner side surface of the circular groove is slidingly connected to an internal threaded tube 3, the internal threaded tube 3 is fixedly connected to the preload ring 23, the inner side surface of the internal threaded tube 3 is threadedly connected to an adjusting screw 31, and a driving gear 32 is fixedly installed on the outside of the adjusting screw 31. Both sides of the valve body 1 are rotatably connected to a control gear ring 33, and all the driving gears 32 are engaged with the control gear ring 33.

[0023] When the floating ball valve is initially installed, the operator manually rotates the control gear ring 33 to drive all the driving gears 32 to rotate. The rotation of the driving gear 32 drives the adjusting screw 31 to rotate. The rotation of the adjusting screw 31 drives the internal threaded tube 3 to move linearly along its axial direction, so that the preload ring 23 moves and applies pressure to the preload spring 24, so that the pressure ring 22 moves and drives the sealing gasket 2 to contact the surface of the ball 102. Moreover, as the compression degree of the preload spring 24 deepens, the contact pressure between the sealing gasket 2 and the ball 102 increases. Moreover, when the sealing surface is subsequently worn, under the pressure exerted by the preload spring 24, the sealing gasket 2 can compensate for the wear by itself, thereby effectively ensuring the sealing between the ball 102 and the sealing gasket 2, making it difficult for the liquid inside the valve body 1 to leak.

[0024] Example 2: See also Figure 4 、 Figure 6-Figure 7 , this embodiment provides a technical solution based on the above embodiment: a ring sleeve 4 is installed at the end of the control gear ring 33, and a driving sleeve 41 is slidably connected to the inner side surface of the ring sleeve 4, and a plurality of guide straight grooves 42 are equidistantly provided on the inner side surface of the ring sleeve 4 in a circular shape, and a guide block 43 adapted to the guide straight groove 42 is installed on the side of the ring sleeve 4, and a return spring 44 is installed between the guide block 43 and the side of the inner wall of the guide straight groove 42 away from the ball 102, and an accommodating groove 45 is provided on the surface of the valve body 1, and a plurality of positioning grooves 46 are equidistantly provided on the side of the accommodating groove 45 close to the ball 102, and a plurality of positioning strips 47 adapted to the positioning grooves 46 are installed on the inner wall of the driving sleeve 41.

[0025] It should be noted that the width of the positioning bar 47 is smaller than the width of the receiving groove 45 , so that the positioning bar 47 can move completely into the receiving groove 45 , thereby not hindering the normal rotation of the drive sleeve 41 .

[0026] In the non-adjustment state, the positioning bar 47 is embedded in the positioning groove 46, so that the drive sleeve 41 cannot rotate, thereby limiting the rotation of the control gear ring 33, thereby ensuring the stability of the preload ring 23 and the preload spring 24 during normal operation; When further adjustment is required, the operator manually pulls the drive sleeve 41 to move, causing the positioning bar 47 to move out of the positioning slot 46, so that it no longer restricts the rotation of the drive sleeve 41. At this time, the control gear ring 33 can be driven to rotate by rotating the drive sleeve 41, thereby achieving adjustment of the preload spring 24.

[0027] Example 3: See also Figure 3 This embodiment provides a technical solution based on the above embodiment: the sealing gasket 2 includes an initial sealing portion 201 and a resealing portion 202, the initial sealing portion 201 is provided with an embedded protrusion 203, and the end of the pressure ring 22 is provided with an embedded groove 5, the shape and size specifications of the embedded protrusion 203 are adapted to the embedded groove 5, through the setting of the embedded groove 5 and the embedded protrusion 203, the sealing gasket 2 can be replaced as needed during the subsequent maintenance of the valve body 1.

[0028] Example 4: See also Figure 3 , this embodiment provides a technical solution based on the above embodiment: the inner side surface of the pre-tightening groove is slidably connected to a re-pressure ring 6, the position of the re-pressure ring 6 is adapted to the re-sealing portion 202, and the outer side surface of the pressure ring 22 is provided with a plurality of pressure guide grooves 61, and the surface of the re-pressure ring 6 is installed with a pressure block 62 adapted to the pressure guide groove 61, and a buffer spring 63 is installed between the side of the pressure block 62 close to the sphere 102 and the inner wall of the pressure guide groove 61, and the pre-tightening spring 24 is fixedly connected between the pre-tightening ring 23 and the re-pressure ring 6.

[0029] It should be added that the deformation critical force value of the pre-tightening spring 24 is greater than the deformation critical force value of the buffer spring 63, so that when the pre-tightening spring 24 is subjected to pressure as the pre-tightening ring 23 moves, it can first overcome the deformation force of the buffer spring 63 to apply pressure to the sealing gasket 2, so that the initial sealing part 201 on the sealing gasket 2 can first abut against the surface of the sphere 102 for sealing. After the initial sealing part 201 abuts against the surface of the sphere 102, the deformation force of the buffer spring 63 gradually approaches the deformation critical force of the pre-tightening spring 24, so that when the pre-tightening ring 23 continues to move, it can continue to apply pressure to the pre-tightening spring 24 to cause it to be compressed and deformed.

[0030] When dealing with special usage environments, such as highly corrosive media environments, when the sealing gasket 2 is initially set, the pre-tightening ring 23 is continuously driven so that the pre-tightening spring 24 continues to overcome the deformation force of the buffer spring 63, so that the pressure-recovering ring 6 can move to a position a sufficient distance from the pressure ring 22, so that the pressure-recovering ring 6 can apply pressure to the re-sealing part 202, so that the re-sealing part 202 can fully contact and squeeze the surface of the ball 102, thereby forming two seals between the ball 102 and the inner wall of the valve body 1, which can make it more sealed.

[0031] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A floating ball valve with a pre-tightening function for use in petrochemical industry, comprising a valve body (1) with liquid ports (101) provided at both ends, a sphere (102) provided inside the valve body (1), a through groove (103) adapted to the liquid port (101) provided on the sphere (102), a valve stem (104) connected to the sphere (102) provided at the top of the valve body (1), characterized in that: Sealing gaskets (2) are provided on both sides of the inner wall of the valve body (1) and are located between the inner wall of the valve body (1) and the sphere (102); Both ends of the inner wall of the valve body (1) are provided with annular grooves (21), the inner side surface of the annular groove (21) is slidably connected to a pressure ring (22), the sealing gasket (2) is arranged on the pressure ring (22), the inner wall of the valve body (1) is provided with a pre-tightening groove, the inner side surface of the pre-tightening groove is slidably connected to a pre-tightening ring (23), a pre-tightening spring (24) is arranged between the pre-tightening ring (23) and the pressure ring (22), and a driving unit is arranged outside the pre-tightening ring (23), the driving unit is used to drive the pre-tightening ring (23) and the pre-tightening spring (24) to apply a pre-tightening force to the pressure ring (22), so that the sealing gasket (2) abuts against the surface of the ball (102).

2. A floating ball valve with pre-tightening function for petrochemical industry according to claim 1, characterized in that: The valve body (1) consists of two components, and the two components are connected and fixed by means of bolts and nuts.

3. A floating ball valve with pre-tightening function for petrochemical industry according to claim 2, characterized in that: The driving unit comprises a plurality of circular grooves equidistantly distributed in a circular ring shape, the inner side surface of the circular groove is slidably connected to an internal threaded tube (3), the internal threaded tube (3) is fixedly connected to a preload ring (23), the inner side surface of the internal threaded tube (3) is threadedly connected to an adjusting screw (31), the outside of the adjusting screw (31) is fixedly mounted with a driving gear (32), both sides of the valve body (1) are rotatably connected to a control gear ring (33), and all the driving gears (32) are meshed with the control gear ring (33).

4. A floating ball valve with pre-tightening function for petrochemical industry according to claim 3, characterized in that: A ring sleeve (4) is installed at the end of the control gear ring (33), and a driving sleeve (41) is slidably connected to the inner side surface of the ring sleeve (4). The inner side surface of the ring sleeve (4) is annular and has a plurality of guide straight grooves (42) equidistantly formed thereon. A guide block (43) adapted to the guide straight grooves (42) is installed on the side surface of the ring sleeve (4).

5. The floating ball valve with pre-tightening function for petrochemical industry according to claim 4, characterized in that: A return spring (44) is installed between the guide block (43) and the inner wall of the guide straight groove (42) away from the sphere (102). A receiving groove (45) is provided on the surface of the valve body (1). A plurality of positioning grooves (46) are provided in a circular shape and equidistantly on the side of the receiving groove (45) close to the sphere (102). A plurality of positioning strips (47) adapted to the positioning grooves (46) are installed on the inner wall of the drive sleeve (41).

6. The floating ball valve with pre-tightening function for petrochemical industry according to claim 5, characterized in that: The width of the positioning strip (47) is smaller than the width of the accommodating groove (45).

7. The floating ball valve with pre-tightening function for petrochemical industry according to claim 6, characterized in that: The sealing gasket (2) comprises an initial sealing portion (201) and a resealing portion (202); an embedding convex portion (203) is provided on the initial sealing portion (201); an embedding groove (5) is provided at the end of the pressure ring (22); and the shape and size of the embedding convex portion (203) are compatible with the embedding groove (5).

8. The floating ball valve with pre-tightening function for petrochemical industry according to claim 7, characterized in that: A re-pressure ring (6) is slidably connected to the inner side surface of the pre-tightening groove, and the position of the re-pressure ring (6) is adapted to the re-sealing portion (202).

9. The floating ball valve with pre-tightening function for petrochemical industry according to claim 8, characterized in that: The outer side surface of the pressure ring (22) is provided with a plurality of pressure guide grooves (61), the surface of the pressure-recovering ring (6) is provided with a pressure block (62) adapted to the pressure guide groove (61), a buffer spring (63) is provided between the side of the pressure block (62) close to the sphere (102) and the inner wall of the pressure guide groove (61), and the preload spring (24) is fixedly connected between the preload ring (23) and the pressure-recovering ring (6).

10. The floating ball valve with pre-tightening function for petrochemical industry according to claim 9, characterized in that: The deformation critical force value of the preload spring (24) is greater than the deformation critical force value of the buffer spring (63).

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