Fluorine-lined ball valve

Abstract

The utility model discloses a fluorine lining ball valve which comprises a valve body, a valve cover, a valve rod, a valve seat and a ball body, and fluorine lining layers are arranged on the valve body, the ball body and the valve rod. The packing sealing assembly comprises a packing gland, a pull ring, a pressing ring, a packing assembly and a supporting ring, a sealing cavity is formed in the upper end of the valve cover, the packing gland is connected with the upper end of the valve body through a bolt, and the bottom end of the packing gland abuts against the upper end of the pull ring, so that the pressing ring, the packing assembly and the supporting ring are pressed in the sealing cavity through the pull ring; a plurality of receding grooves are formed in the lower end of the pressing ring, a plurality of connecting rods with the number equal to that of the receding grooves are arranged at the lower end of the pull ring, the connecting rods sequentially penetrate through the pressing ring, the packing assembly and the supporting ring in the vertical direction and extend into the corresponding receding grooves, floating gaps are formed between the bottom ends of the connecting rods and the inner end face of the sealing cavity, and limiting rings are arranged at the lower ends of the connecting rods. According to the utility model, the convenience of packing disassembly and assembly is obviously improved, and the earlier-stage assembly and the later-stage replacement and maintenance operation are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a fluorine-lined ball valve. Background Art

[0002] Ball valves are widely used in fluid control. In fluid control applications, ball valves are mainly used in pipelines to open, close, distribute the flow of fluid media, change the flow direction and flow rate of fluid media, etc.

[0003] The ball valve on the market generally includes a valve body, a valve cover, a valve stem and a ball. The valve cover is installed on the upper part of the valve body. The valve stem passes through the valve cover and extends into the valve body to be linked with the ball. The valve seat is installed inside the valve body to form a seal with the valve seat when the valve is closed. For fluorine-lined ball valves, the valve body, valve seat and ball need to be lined with fluorine. The invention patent with patent publication (announcement) number CN105927749A discloses a leak-free fluorine-lined ball valve, which includes a valve body, a valve stem and a ball. The ball is located in the valve body, the valve stem passes through the valve body, one end of the valve stem is fixed to the ball, and the other end extends to the valve body. The ball is located outside the valve body and is integrally provided with a fluorine-lined collar fixed to the ball. The valve body is composed of a first valve body and a second valve body arranged oppositely, and the first valve body is provided with a packing cavity around the fluorine-lined collar, and the packing cavity is filled with packing. The installation structure of the packing has a defect, that is, the subsequent disassembly and replacement is rather troublesome, especially when the size is small, it is necessary to use contact tools to pry out the packing, and the fluorine-lined sleeve ring is easily damaged during the operation. Therefore, it is necessary to design a fluorine-lined ball valve that is easy to disassemble and replace the packing. Utility Model Content

[0004] The utility model aims to provide a fluorine-lined ball valve, which significantly improves the convenience of packing disassembly and assembly, and is beneficial to early assembly and later replacement and maintenance operations.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a fluorine-lined ball valve, comprising a valve body, a valve cover and a ball, wherein the valve cover is mounted on the upper part of the valve body by fasteners, the ball is arranged in the valve body, a valve stem is arranged on the upper end of the ball, and the valve stem penetrates the valve cover and extends to the outside of the valve body, and valve seats for sealing with the outer surface of the ball are also arranged in the valve body at positions corresponding to both sides of the ball, and the valve body, the ball and the valve stem are all provided with a fluorine-lined layer; and a packing sealing assembly is also included, and the packing sealing assembly includes a packing gland, a pull ring, a pressure ring, a packing assembly and a support ring which are sequentially sleeved on the outer periphery of the valve stem from top to bottom, and the A sealing cavity is provided at a position on the upper end of the valve cover corresponding to the outer periphery of the valve stem, and the sealing cavity is coaxial with the valve stem. The packing gland is connected to the upper end of the valve body by bolts, and the bottom end of the packing gland is tightly pressed against the upper end of the pull ring, so that the pull ring presses the pressure ring, the packing assembly and the support ring in the sealing cavity; a plurality of clearance grooves are provided at the lower end of the pressure ring, and a plurality of connecting rods whose number is equal to the clearance grooves are provided at the lower end of the pull ring. The connecting rods vertically penetrate the pressure ring, the packing assembly and the support ring in sequence, and extend into the corresponding clearance grooves, and a floating gap is provided between the bottom end of the connecting rod and the inner end surface of the sealing cavity, and a limiting ring is provided at the lower end of the connecting rod.

[0006] By adopting the above technical solution, during installation, the packing gland, pull ring, pressure ring, packing assembly and support ring are sleeved on the outer periphery of the valve stem from top to bottom, and the packing gland is connected to the valve cover by bolts. The packing gland provides a downward pre-tightening force to the pull ring, so that the pull ring presses the pressure ring, packing assembly and support ring in the sealing cavity, and the packing assembly is deformed under pressure, which can ensure the sealing between the packing assembly and the outer cylindrical surface of the valve stem, between the packing assembly and the inner cylindrical surface of the sealing cavity, and between the packing assembly and the connecting rod; during disassembly, since the bottom end of the connecting rod of the pull ring is provided with a limiting ring, after removing the packing gland, only the pull ring needs to be lifted upwards to take out the pressure ring, packing assembly and support ring, and then the packing assembly can be replaced and reinstalled. This structure significantly improves the convenience of packing disassembly and assembly, and is conducive to early assembly and later replacement and maintenance operations.

[0007] The utility model is further configured that the lower end surface of the outer circle of the pull ring is provided with an operating recess.

[0008] By adopting the above technical solution, an operating recess is provided at this position, so that an operator can insert his / her finger into the recess and apply force to the pull ring to lift the pull ring.

[0009] The utility model is further configured that a screw portion is provided at the lower end of the connecting rod, the outer diameter of the screw portion is smaller than the outer diameter of the connecting rod, and the limiting ring is threadedly connected to the screw portion.

[0010] By adopting the above technical solution, the connection structure between the limit ring and the connecting rod is simple and reliable, and disassembly and assembly are very convenient. Moreover, since the limit ring and the screw part are threadedly matched, the axial position of the limit ring can be changed according to actual needs, and adjustment is very convenient.

[0011] The utility model is further configured such that the packing sealing assembly includes an upper packing, an upper self-sealing packing, a lower self-sealing packing and a lower packing which are arranged in sequence from top to bottom, the lower end of the upper self-sealing packing is provided with an annular recess with a conical cross-section, the upper end of the lower self-sealing packing is provided with an annular convex portion which matches the annular recess, and the connecting rod passes through the middle of the annular recess and the annular convex portion.

[0012] By adopting the above technical solution, the greater the axial extrusion force, the better the sealing effect, which can ensure good sealing between the packing assembly and the outer cylindrical surface of the valve stem, between the packing assembly and the inner cylindrical surface of the sealing cavity, and between the packing assembly and the connecting rod.

[0013] The utility model is further configured such that an annular mounting groove is respectively provided at the position on both sides of the spherical body corresponding to the inner wall of the valve body, the valve seat is embedded in the corresponding annular mounting groove, a plurality of circular grooves are provided at one end of the valve seat close to the annular mounting groove, a cylindrical top block is axially slidably arranged in the circular groove, the outer end of the cylindrical top block is tightly pressed against the inner end surface of the annular mounting groove, and a disc spring is sandwiched between the inner end surface of the cylindrical top block and the inner end surface of the circular groove.

[0014] By adopting the above technical scheme, the disc spring provides spring force for the valve seat. After the valve seat sealing surface is worn, the disc spring squeezes the valve seat, causing the valve seat sealing surface to always press against the surface of the ball, thereby ensuring good sealing between the valve seat and the ball and improving the service life of the valve. The cylindrical top block presses against the annular mounting groove, while the disc spring directly presses against the annular mounting groove, which can protect the inner end face of the annular mounting groove and prevent its surface from being scratched by the disc spring.

[0015] The utility model is further configured that a pressure stabilizing hole is axially provided on the columnar top block.

[0016] By adopting the above technical solution, the cylindrical top block can be smoothly installed in the corresponding circular groove, and at the same time it can be ensured that it can smoothly slide axially relative to the valve seat.

[0017] The utility model is further configured such that the valve body comprises a left valve body and a right valve body, the left valve body and the right valve body are connected together by fasteners, and the ball and the valve seat are arranged in an inner cavity formed by assembling the left valve body and the right valve body.

[0018] By adopting the above technical solution, the detachable design of the valve body greatly facilitates the disassembly and assembly of internal parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the packing seal assembly of the utility model;

[0021] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of the middle part A;

[0022] Figure 4 for Figure 1 Schematic diagram of the enlarged structure of part B in the middle.

[0023] In the figure: 1. valve body; 2. valve cover; 3. ball; 4. valve stem; 5. valve seat; 6. fluorine lining layer; 7. packing seal assembly; 8. packing gland; 9. pull ring; 10. pressure ring; 11. packing assembly; 12. support ring; 13. sealing chamber; 14. bolt; 15. clearance groove; 16. connecting rod; 17. floating gap; 18. limit ring; 19. operating recess; 20. screw part; 21. upper packing; 22. upper self-sealing packing; 23. lower self-sealing packing; 24. lower packing; 25. annular recess; 26. annular protrusion; 27. annular mounting groove; 28. circular groove; 29. ​​cylindrical top block; 30. disc spring; 31. pressure stabilizing hole; 32. left valve body; 33. right valve body. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Example: As attached Figures 1 to 4A fluorine-lined ball valve shown in the figure comprises a valve body 1, a valve cover 2 and a ball 3, wherein the valve cover 2 is mounted on the upper part of the valve body 1 by fasteners, the ball 3 is arranged in the valve body 1, a valve stem 4 is arranged on the upper end of the ball 3, and the valve stem 4 penetrates the valve cover 2 and extends to the outside of the valve body 1, and valve seats 5 for sealing with the outer surface of the ball 3 are also arranged in the valve body 1 at positions corresponding to both sides of the ball 3, and a fluorine-lined layer 6 is arranged on the valve body 1, the ball 3 and the valve stem 4; the fluorine-lined ball valve also comprises a packing seal assembly 7, the packing seal assembly 7 comprises a packing gland 8, a pull ring 9, a pressure ring 10, a packing assembly 11 and a support ring 12 which are sequentially sleeved on the outer periphery of the valve stem 4 from top to bottom, a sealing cavity 13 is arranged on the upper end of the valve cover 2 corresponding to the outer periphery of the valve stem 4, and the sealing cavity 13 is coaxial with the valve stem 4, and the packing The material pressure cover 8 is connected to the upper end of the valve body 1 by bolts 14, and the bottom end of the packing pressure cover 8 is tightly pressed against the upper end of the pull ring 9, so that the pull ring 9 presses the pressure ring 10, the packing assembly 11 and the support ring 12 in the sealing cavity 13; the lower end of the pressure ring 10 is provided with a plurality of makeshift grooves 15, and the lower end of the pull ring 9 is provided with a plurality of connecting rods 16 whose number is equivalent to the makeshift grooves 15, and the number of the connecting rods 16 is at least two, and the connecting rods 16 vertically penetrate the pressure ring 10, the packing assembly 11 and the support ring 12 in sequence, that is, the pressure ring 10, the packing assembly 11 and the support ring 12 are all provided with through holes for the connecting rods 16 to pass through, and extend into the corresponding makeshift grooves 15, and a floating gap 17 is provided between the bottom end of the connecting rod 16 and the inner end surface of the sealing cavity 13, and a limiting ring 18 is provided at the lower end of the connecting rod 16. During installation, the packing gland 8, the pull ring 9, the pressure ring 10, the packing assembly 11 and the support ring 12 are sleeved on the outer periphery of the valve stem 4 from top to bottom. The packing gland 8 is connected to the valve cover 2 by bolts 14. The packing gland 8 provides a downward pre-tightening force to the pull ring 9, so that the pull ring 9 presses the pressure ring 10, the packing assembly 11 and the support ring 12 in the sealing cavity 13. The packing assembly 11 is deformed under pressure, which can ensure the sealing between the packing assembly 11 and the outer cylindrical surface of the valve stem 4, between the packing assembly 11 and the inner cylindrical surface of the sealing cavity 13, and between the packing assembly 11 and the connecting rod 16; during disassembly, since the bottom end of the connecting rod 16 of the pull ring 9 is provided with a limit ring 18, after removing the packing gland 8, only the pull ring 9 needs to be lifted upwards, and the pressure ring 10, the packing assembly 11 and the support ring 12 can be completely taken out, and then the packing assembly 11 can be replaced and reinstalled. This structure significantly improves the convenience of packing disassembly and assembly, which is conducive to early assembly and later replacement and maintenance operations.

[0026] As attached Figure 2 As shown, the lower end surface of the outer circle of the pull ring 9 is provided with an operating recess 19. The operating recess 19 is provided at this position to facilitate the operator to insert his fingers and apply force to the pull ring 9 to lift the pull ring 9.

[0027] As attached Figure 2 and attached Figure 3 As shown, the lower end of the connecting rod 16 is provided with a screw portion 20, the pull ring 9, the connecting rod 16 and the screw portion 20 are an integrated structure, the outer diameter of the screw portion 20 is smaller than the outer diameter of the connecting rod 16, the inner circumference of the limiting ring 18 is provided with an internal thread, and the limiting ring 18 is threadedly connected to the screw portion 20. The connection structure of the limiting ring 18 and the connecting rod 16 is simple and reliable, and the disassembly and assembly is very convenient. Moreover, since the limiting ring 18 and the screw portion 20 are threadedly matched, the axial position of the limiting ring 18 can be changed according to actual needs, and the adjustment is very convenient.

[0028] As attached Figure 2 As shown, the packing seal assembly 7 includes an upper packing 21, an upper self-sealing packing 22, a lower self-sealing packing 23 and a lower packing 24 arranged in sequence from top to bottom, the lower end of the upper self-sealing packing 22 is provided with an annular recess 25 with a conical cross section, the upper end of the lower self-sealing packing 23 is provided with an annular protrusion 26 that fits the annular recess 25, and the connecting rod 16 passes through the middle of the annular recess 25 and the annular protrusion 26. The greater the axial extrusion force, the better the sealing effect, which can ensure good sealing between the packing assembly 11 and the outer cylindrical surface of the valve stem 4, between the packing assembly 11 and the inner cylindrical surface of the sealing cavity 13, and between the packing assembly 11 and the connecting rod 16.

[0029] As attached Figure 1 and attached Figure 4 As shown, an annular mounting groove 27 is respectively provided at the position on both sides of the inner wall of the valve body 1 corresponding to the spherical body 3, and the valve seat 5 is embedded in the corresponding annular mounting groove 27. A plurality of circular grooves 28 are provided at one end of the valve seat 5 close to the annular mounting groove 27. A cylindrical top block 29 is axially slidably arranged in the circular groove 28. The outer end of the cylindrical top block 29 is tightly pressed against the inner end surface of the annular mounting groove 27, and a disc spring 30 is sandwiched between the inner end surface of the cylindrical top block 29 and the inner end surface of the circular groove 28, and the disc spring 30 is always kept in a compressed state. The disc spring 30 provides spring force for the valve seat 5. After the sealing surface of the valve seat 5 is worn, the disc spring 30 squeezes the valve seat 5, causing the sealing surface of the valve seat 5 to always press against the surface of the ball 3, thereby ensuring good sealing between the valve seat 5 and the ball 3 and improving the service life of the valve. The cylindrical top block 29 presses against the annular mounting groove 27, while the disc spring 30 directly presses against the annular mounting groove 27, which can protect the inner end face of the annular mounting groove 27 and prevent its surface from being scratched by the disc spring 30.

[0030] As attached Figure 4 As shown, a pressure stabilizing hole 31 is axially provided on the cylindrical top block 29. This design enables the cylindrical top block 29 to be smoothly installed in the corresponding circular groove 28, and also ensures that it can smoothly slide axially relative to the valve seat 5.

[0031] As attached Figure 1As shown, the valve body 1 includes a left valve body 32 and a right valve body 33, the left valve body 32 and the right valve body 33 are connected together by fasteners, and the ball 3 and the valve seat 5 are arranged in the inner cavity formed by the assembly of the left valve body 32 and the right valve body 33. The detachable design of the valve body 1 greatly facilitates the disassembly and assembly of the internal parts.

Claims

1. A fluorine-lined ball valve, comprising a valve body (1), a valve cover (2) and a ball (3), wherein the valve cover (2) is mounted on the upper part of the valve body (1) by means of fasteners, the ball (3) is arranged in the valve body (1), a valve stem (4) is arranged at the upper end of the ball (3), and the valve stem (4) penetrates the valve cover (2) and extends to the outside of the valve body (1), and valve seats (5) for forming a sealing fit with the outer surface of the ball (3) are also arranged in the valve body (1) at positions corresponding to both sides of the ball (3), and the valve body (1), the ball (3) and the valve stem (4) are all provided with a fluorine-lined layer (6); characterized in that: The valve body (2) further comprises a packing seal assembly (7), wherein the packing seal assembly (7) comprises a packing gland (8), a pull ring (9), a pressure ring (10), a packing assembly (11) and a support ring (12) which are sequentially sleeved on the outer periphery of the valve stem (4) from top to bottom; a sealing cavity (13) is provided at the upper end of the valve cover (2) corresponding to the outer periphery of the valve stem (4), and the sealing cavity (13) is coaxial with the valve stem (4); the packing gland (8) is connected to the upper end of the valve body (1) by means of bolts (14); the bottom end of the packing gland (8) is tightly pressed against the upper end of the pull ring (9), so that the pull ring (9) presses the pressure ring (10) , a packing assembly (11) and a support ring (12) are pressed tightly in a sealing cavity (13); a plurality of clearance grooves (15) are provided at the lower end of the pressure ring (10); a plurality of connecting rods (16) whose number is equal to the clearance grooves (15) are provided at the lower end of the pull ring (9); the connecting rods (16) vertically penetrate the pressure ring (10), the packing assembly (11) and the support ring (12) in sequence and extend into the corresponding clearance grooves (15); a floating gap (17) is provided between the bottom end of the connecting rod (16) and the inner end surface of the sealing cavity (13); a limiting ring (18) is provided at the lower end of the connecting rod (16).

2. A fluorine-lined ball valve according to claim 1, characterized in that: An operating recess (19) is provided on the lower end surface of the outer circle of the pull ring (9).

3. A fluorine-lined ball valve according to claim 1, characterized in that: A screw portion (20) is provided at the lower end of the connecting rod (16), the outer diameter of the screw portion (20) is smaller than the outer diameter of the connecting rod (16), and the limiting ring (18) is threadedly connected to the screw portion (20).

4. A fluorine-lined ball valve according to claim 1, characterized in that: The packing seal assembly (7) comprises an upper packing (21), an upper self-sealing packing (22), a lower self-sealing packing (23) and a lower packing (24) which are arranged in sequence from top to bottom, the lower end of the upper self-sealing packing (22) is provided with an annular recess (25) having a conical cross-section, the upper end of the lower self-sealing packing (23) is provided with an annular protrusion (26) which matches the annular recess (25), and the connecting rod (16) passes through the middle of the annular recess (25) and the annular protrusion (26).

5. The fluorine-lined ball valve according to claim 1, characterized in that: An annular mounting groove (27) is respectively provided at positions on both sides of the inner wall of the valve body (1) corresponding to the spherical body (3), and the valve seat (5) is embedded in the corresponding annular mounting groove (27). A plurality of circular grooves (28) are provided at one end of the valve seat (5) close to the annular mounting groove (27), and a cylindrical top block (29) is axially slidably arranged in the circular groove (28). The outer end of the cylindrical top block (29) is tightly pressed against the inner end surface of the annular mounting groove (27), and a disc spring (30) is sandwiched between the inner end surface of the cylindrical top block (29) and the inner end surface of the circular groove (28).

6. A fluorine-lined ball valve according to claim 5, characterized in that: The columnar top block (29) is provided with a pressure-stabilizing hole (31) extending therethrough in the axial direction.

7. The fluorine-lined ball valve according to claim 1, characterized in that: The valve body (1) comprises a left valve body (32) and a right valve body (33), wherein the left valve body (32) and the right valve body (33) are connected together by fasteners, and the ball (3) and the valve seat (5) are arranged in an inner cavity formed by assembling the left valve body (32) and the right valve body (33).

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