Anti-scouring sealing stop valve

Abstract

The anti-scouring sealing stop valve comprises a valve body, a valve cover, a valve rod, a valve clack and a valve seat, an inlet flow channel and an outlet flow channel which are communicated with each other are arranged in the valve body, an overflowing opening is formed between the inlet flow channel and the outlet flow channel, the valve cover is installed at the upper end of the valve body, the valve rod penetrates through the valve cover and extends into the valve body, and the valve clack is installed at the inner end of the valve rod. The valve seat is mounted on the overflowing opening; the filter assembly comprises a filter screen and a pressing ring, the filter screen comprises an annular base, a hemispherical flow guide part arranged in the middle of the annular base and an annular flange arranged on the outer edge of the annular base, the hemispherical flow guide part protrudes in the direction away from the valve clack, and the annular flange extends in the direction away from the valve clack; and the pressing ring is mounted at the bottom of the valve seat and presses the annular flange of the filter screen at the bottom end of the valve seat. Media in the flow channel can be filtered, the function of protecting the valve seat and the valve clack is achieved, the valve has good anti-scouring performance, and the service life of the valve can be remarkably prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to an anti-scouring sealing stop valve with a filtering function. Background Art

[0002] The opening and closing part of the stop valve is a plug-shaped disc, the sealing surface is a flat surface or a sea cone surface, and the disc moves linearly along the center line of the valve seat. The movement form of the valve stem also has a lifting and rotating rod type, which can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media.

[0003] The existing stop valve does not have a filtering function. Since the medium in the flow channel contains solid impurities, the valve seat and valve disc surface will be scratched and worn due to the scouring effect of the medium during long-term use, resulting in poor sealing when the valve is closed, causing medium leakage. Utility Model Content

[0004] The purpose of the utility model is to provide an anti-scouring sealing stop valve, which can filter the medium in the flow channel, protect the valve seat and the valve disc, make it have good anti-scouring performance, and can significantly increase the service life of the valve.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an anti-scour sealing stop valve, comprising a valve body, a valve cover, a valve stem, a valve disc and a valve seat, wherein the valve body is provided with an inlet flow channel and an outlet flow channel which are interconnected, a flow port is provided between the inlet flow channel and the outlet flow channel, the valve cover is mounted on the upper end of the valve body, the valve stem penetrates the valve cover and extends into the interior of the valve body, the valve disc is mounted on the inner end of the valve stem, and the valve seat is mounted on the flow port to form a sealing fit with the valve disc when the valve is closed; and further comprising a filter assembly, the filter assembly comprising a filter screen and a pressing ring, the filter screen comprising an annular base, a hemispherical guide portion arranged in the middle of the annular base and an annular flange arranged at the outer edge of the annular base, the hemispherical guide portion protrudes in a direction away from the valve disc, the annular flange extends in a direction away from the valve disc, and an annular concave cavity is formed between the annular flange, the annular base and the hemispherical guide portion, and the pressing ring is mounted on the bottom of the valve seat and presses the annular flange of the filter screen against the bottom end of the valve seat.

[0006] By adopting the above technical solution, a filter is installed on the valve seat, which can filter the medium in the flow channel, protect the valve seat and the valve disc, and significantly improve the service life of the valve. The filter is installed on the valve seat and can be installed or disassembled together with the valve seat, which is conducive to the early assembly and the disassembly and maintenance operations. In addition, since the hemispherical guide part in the middle of the filter is convex away from the valve disc, during the opening process of the valve, large particles of impurities will be washed into the annular cavity of the filter under the impact of the water flow, and the hemispherical guide part in the middle of the filter can avoid the adhesion of the medium and blockage, thereby ensuring the smooth flow of the medium.

[0007] The utility model is further configured such that a thread groove is provided on the inner circular surface of the bottom end of the valve seat, an annular positioning groove is provided on the upper end of the thread groove, the pressure ring is threadedly connected to the thread groove, and the pressure ring presses the annular flange of the filter screen tightly in the annular positioning groove.

[0008] By adopting the above technical solution, the installation structure is simple and reliable, and the assembly and disassembly is very convenient.

[0009] The utility model is further configured that an annular positioning flange is provided at the upper end of the pressure ring, the outer circumferential surface of the annular flange is fitted with the inner circumferential surface of the annular positioning groove, and the inner circumferential surface of the annular flange is fitted with the outer circumferential surface of the annular positioning flange.

[0010] By adopting the above technical solution, the stability of filter installation can be further improved.

[0011] The utility model is further configured that a conical guide surface is provided at the outer edge of the upper end of the annular positioning flange.

[0012] By adopting the above technical solution, a guide structure (conical guide surface) is provided at the upper end of the pressing ring, which further facilitates the installation of the pressing ring.

[0013] The utility model is further configured that an elastic pad is sandwiched between the pressure ring and the inner end surface of the thread groove.

[0014] By adopting the above technical solution, the elastic pad can provide a pre-tightening force for the pressing ring, thereby increasing the thread friction force on the pressing ring and achieving an anti-loosening effect.

[0015] The utility model is further configured that a plurality of grooves for inserting tools are distributed in a circular array at the bottom end of the pressing ring.

[0016] By adopting the above technical solution, it is convenient to rotate the pressure ring, which is more conducive to its disassembly and assembly.

[0017] The utility model is further configured such that the valve seat is threadedly connected to the flow port, and the upper end of the valve seat is provided with a first limiting flange extending toward the outer periphery, the first limiting flange is pressed against the position of the inner wall of the valve body corresponding to the upper end of the flow port, and a first sealing gasket is sandwiched between the first limiting flange and the inner wall of the valve body.

[0018] By adopting the above technical solution, the installation structure of the valve seat is simple and reliable, and has good sealing performance.

[0019] The utility model is further configured such that a sewage outlet is provided at a position at the bottom of the valve body corresponding to below the filter screen, the outer end of the sewage outlet is threadedly connected with a hexagonal plug, the outer end of the hexagonal plug is provided with a second limiting flange extending toward the outer periphery, and a second sealing gasket is sandwiched between the second limiting flange and the bottom of the valve body.

[0020] By adopting the above technical solution, the hexagonal plug can be opened regularly to drain the valve and remove the impurities filtered inside, thus avoiding blockage inside the valve due to excessive accumulation of impurities.

[0021] The utility model is further configured as follows: an upper cavity with an inner diameter larger than an outer diameter of a valve stem is provided at the upper end of the valve disc, the inner end of the valve stem extends into the upper cavity, an annular groove is circumferentially provided at the portion of the valve stem located in the upper cavity, a three-open ring is clamped on the annular groove, a limiting sleeve is also provided in the upper cavity and is tightly pressed against the upper end of the three-open ring, the inner circular surface of the limiting sleeve is fitted with the outer circular surface of the valve stem, the outer circular surface of the limiting sleeve is fitted with the inner circular surface of the upper cavity, a plurality of screw holes connected to the upper cavity are provided in a circular array on the outer circular surface of the valve disc, an annular limiting groove is provided on the outer periphery of the limiting sleeve, an inner hexagonal stud is threadedly connected to the screw hole, and the inner end of the inner hexagonal stud extends into the annular limiting groove.

[0022] By adopting the above technical solution, the connection structure between the valve disc and the valve stem is simple and reliable. Compared with the prior art in which the limit sleeve is installed on the valve disc by threaded connection, this structure will not cause the axial position of the valve disc to change due to thread loosening, and the structural stability is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of the middle part A;

[0025] Figure 3 for Figure 1 A schematic diagram of the enlarged structure of the middle B part;

[0026] Figure 4 It is a schematic diagram of the connection structure between the valve stem and the valve disc of the utility model.

[0027] In the figure: 1. valve body; 2. valve cover; 3. valve stem; 4. valve disc; 5. valve seat; 6. inlet flow channel; 7. outlet flow channel; 8. flow port; 9. filter screen; 10. pressure ring; 11. annular base; 12. hemispherical guide part; 13. annular flange; 14. annular cavity; 15. threaded groove; 16. annular positioning groove; 17. annular positioning flange; 18. conical guide surface; 19. elastic pad; 20. groove; 21. first limiting flange; 22. first sealing gasket; 23. drain outlet; 24. hexagon socket plug; 25. second limiting flange; 26. second sealing gasket; 27. upper cavity; 28. annular groove; 29. ​​three-open ring; 30. limiting sleeve; 31. screw hole; 32. annular limiting groove; 33. hexagon socket stud. DETAILED DESCRIPTION

[0028] 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.

[0029] Example: As attached Figures 1 to 4The anti-scour sealing stop valve shown in the figure comprises a valve body 1, a valve cover 2, a valve stem 3, a valve disc 4 and a valve seat 5. The valve body 1 is provided with an inlet flow channel 6 and an outlet flow channel 7 which are interconnected. A flow port 8 is provided between the inlet flow channel 6 and the outlet flow channel 7. The valve cover 2 is mounted on the upper end of the valve body 1. The valve stem 3 penetrates the valve cover 2 and extends into the interior of the valve body 1. The valve disc 4 is mounted on the inner end of the valve stem 3. The valve seat 5 is mounted on the flow port 8 to form a sealing fit with the valve disc 4 when the valve is closed. The stop valve also comprises a filter assembly, which comprises The filter screen 9 and the pressing ring 10 include an annular base 11, a hemispherical guide portion 12 arranged in the middle of the annular base 11, and an annular flange 13 arranged at the outer edge of the annular base 11. The hemispherical guide portion 12 protrudes in a direction away from the valve disc 4, and the annular flange 13 extends in a direction away from the valve disc 4. An annular concave cavity 14 is formed between the annular flange 13, the annular base 11 and the hemispherical guide portion 12. The pressing ring 10 is installed at the bottom of the valve seat 5 and presses the annular flange 13 of the filter screen 9 against the bottom end of the valve seat 5. A filter screen 9 is installed on the valve seat 5. The filter screen 9 is made of hard plastic or metal material. The surface of the filter screen 9 is covered with filter holes, which can filter the medium in the flow channel, protect the valve seat 5 and the valve disc 4, and make it have good anti-scouring performance, which can significantly improve the service life of the valve. The filter screen 9 is installed on the valve seat 5 and can be installed or disassembled together with the valve seat 5, which is conducive to the early assembly and the disassembly and maintenance operations. In addition, since the hemispherical guide portion 12 in the middle of the filter screen 9 protrudes away from the valve disc 4, during the valve opening process, large particles of impurities will be washed into the annular cavity 14 of the filter screen 9 under the impact of the water flow, and the hemispherical guide portion 12 in the middle of the filter screen 9 can avoid the adhesion of the medium and blockage, thereby ensuring the smooth flow of the medium.

[0030] As attached Figure 1 and attached Figure 2 As shown, a thread groove 15 is provided on the inner circumferential surface of the bottom end of the valve seat 5, and an annular positioning groove 16 is provided on the upper end of the thread groove 15. The pressing ring 10 is threadedly connected to the thread groove 15, that is, the outer periphery of the pressing ring 10 has an external thread that matches the internal thread of the thread groove 15, and the pressing ring 10 presses the annular flange 13 of the filter screen 9 tightly against the annular positioning groove 16. Its installation structure is simple and reliable, and it is very convenient to disassemble and assemble.

[0031] As attached Figure 1 and attached Figure 2 As shown, the upper end of the pressing ring 10 is provided with an annular positioning flange 17, the outer circumferential surface of the annular flange 13 fits with the inner circumferential surface of the annular positioning groove 16, and the inner circumferential surface of the annular flange 13 fits with the outer circumferential surface of the annular positioning flange 17. This design can further improve the stability of the installation of the filter screen 9.

[0032] As attached Figure 1 and attached Figure 2 As shown, a conical guide surface 18 is provided at the outer edge of the upper end of the annular positioning flange 17. A guide structure (conical guide surface 18) is provided at the upper end of the pressing ring 10, which further facilitates the installation of the pressing ring 10.

[0033] As attached Figure 1 and attached Figure 2 As shown, an elastic pad 19 is sandwiched between the pressing ring 10 and the inner end surface of the thread groove 15. The elastic pad 19 is made of silicone or rubber. The elastic pad 19 can provide a pre-tightening force for the pressing ring 10, thereby increasing the thread friction force on the pressing ring 10 and playing an anti-loosening effect.

[0034] As attached Figure 1 and attached Figure 2 As shown, a plurality of grooves 20 for inserting tools are arranged in a circumferential array at the bottom end of the pressing ring 10. This design facilitates the rotating operation of the pressing ring 10 and is more conducive to its disassembly and assembly.

[0035] As attached Figure 1 and attached Figure 2 As shown, the valve seat 5 is threadedly connected to the flow port 8, and the upper end of the valve seat 5 is provided with a first limiting flange 21 extending toward the periphery, the first limiting flange 21 is pressed against the position of the inner wall of the valve body 1 corresponding to the upper end of the flow port 8, and a first sealing gasket 22 is sandwiched between the first limiting flange 21 and the inner wall of the valve body 1. The installation structure of the valve seat 5 is simple and reliable, and has good sealing performance.

[0036] As attached Figure 3 As shown, a drain port 23 is provided at the bottom of the valve body 1 corresponding to the position below the filter screen 9, and a hexagonal plug 24 is threadedly connected to the outer end of the drain port 23, that is, the outer end of the plug drain port 23 has a hexagonal groove, and a second limiting flange 25 extending toward the outer circumference is provided at the outer end of the hexagonal plug 24, and a second sealing gasket 26 is sandwiched between the second limiting flange 25 and the bottom of the valve body 1. The hexagonal plug can be opened regularly to drain the valve and remove the impurities filtered inside, so as to avoid blockage inside the valve due to excessive accumulation of impurities.

[0037] As attached Figure 4As shown, the upper end of the valve disc 4 is provided with an upper cavity 27 whose inner diameter is larger than the outer diameter of the valve stem 3, the inner end of the valve stem 3 extends into the upper cavity 27, the portion of the valve stem 3 located in the upper cavity 27 is provided with an annular groove 28 along the circumferential direction, a three-open ring 29 is clamped on the annular groove 28, a limiting sleeve 30 which is tightly abutted against the upper end of the three-open ring 29 is further provided in the upper cavity 27, the inner circumferential surface of the limiting sleeve 30 is in contact with the outer circumferential surface of the valve stem 3, and the outer circumferential surface of the limiting sleeve 30 is in contact with the upper cavity 27. The inner circumference of the cavity 27 fits together, and the outer circumference of the valve disc 4 is provided with a plurality of screw holes 31 in a circumferential array and connected to the upper cavity 27. The outer circumference of the limiting sleeve 30 is provided with an annular limiting groove 32, and the screw hole 31 is threadedly connected with a hexagonal stud 33, that is, the outer end of the stud has a hexagonal groove, and the inner end of the hexagonal stud 33 extends into the annular limiting groove 32. The limiting sleeve 30 and the valve disc 4 are connected by the radial penetration of the hexagonal stud 33. The connection structure between the valve disc 4 and the valve stem 3 is simple and reliable. Compared with the prior art in which the limiting sleeve 30 is installed on the valve disc 4 by threaded connection, this structure will not cause the axial position of the valve disc 4 to change due to thread loosening, and the structural stability is better.

Claims

1. An anti-scour sealing stop valve, comprising a valve body (1), a valve cover (2), a valve stem (3), a valve disc (4) and a valve seat (5), wherein the valve body (1) is provided with an inlet flow channel (6) and an outlet flow channel (7) which are interconnected, a flow passage (8) is provided between the inlet flow channel (6) and the outlet flow channel (7), the valve cover (2) is mounted on the upper end of the valve body (1), the valve stem (3) penetrates the valve cover (2) and extends into the interior of the valve body (1), the valve disc (4) is mounted on the inner end of the valve stem (3), and the valve seat (5) is mounted on the flow passage (8) to form a sealing fit with the valve disc (4) when the valve is closed; characterized in that: The invention also comprises a filter assembly, wherein the filter assembly comprises a filter screen (9) and a pressing ring (10), wherein the filter screen (9) comprises an annular base (11), a hemispherical flow guide portion (12) arranged in the middle of the annular base (11), and an annular flange (13) arranged at the outer edge of the annular base (11), wherein the hemispherical flow guide portion (12) protrudes in a direction away from the valve disc (4), and the annular flange (13) extends in a direction away from the valve disc (4), and an annular concave cavity (14) is formed between the annular flange (13), the annular base (11) and the hemispherical flow guide portion (12), and the pressing ring (10) is installed at the bottom of the valve seat (5) and presses the annular flange (13) of the filter screen (9) against the bottom end of the valve seat (5).

2. The anti-scour sealing stop valve according to claim 1, characterized in that: A thread groove (15) is provided on the inner circular surface of the bottom end of the valve seat (5), and an annular positioning groove (16) is provided on the upper end of the thread groove (15). The pressing ring (10) is threadedly connected to the thread groove (15), and the pressing ring (10) presses the annular flange (13) of the filter screen (9) tightly against the annular positioning groove (16).

3. The anti-scour sealing stop valve according to claim 2, characterized in that: An annular positioning flange (17) is provided at the upper end of the pressure ring (10), the outer circumferential surface of the annular flange (13) fits with the inner circumferential surface of the annular positioning groove (16), and the inner circumferential surface of the annular flange (13) fits with the outer circumferential surface of the annular positioning flange (17).

4. The anti-scour sealing stop valve according to claim 3, characterized in that: A conical guide surface (18) is provided at the outer edge of the upper end of the annular positioning flange (17).

5. The anti-scour sealing stop valve according to claim 2, characterized in that: An elastic pad (19) is sandwiched between the pressure ring (10) and the inner end surface of the thread groove (15).

6. The anti-scour sealing stop valve according to claim 2, characterized in that: The bottom end of the pressing ring (10) is provided with a plurality of grooves (20) for inserting tools distributed in a circumferential array.

7. The anti-scour sealing stop valve according to claim 1, characterized in that: The valve seat (5) is threadedly connected to the flow port (8), and the upper end of the valve seat (5) is provided with a first limiting flange (21) extending toward the outer periphery, the first limiting flange (21) is pressed against the position of the inner wall of the valve body (1) corresponding to the upper end of the flow port (8), and a first sealing gasket (22) is sandwiched between the first limiting flange (21) and the inner wall of the valve body (1).

8. The anti-scour sealing stop valve according to claim 1, characterized in that: A sewage outlet (23) is provided at the bottom of the valve body (1) at a position corresponding to the bottom of the filter screen (9); the outer end of the sewage outlet (23) is threadedly connected to a hexagonal plug (24); the outer end of the hexagonal plug (24) is provided with a second limiting flange (25) extending toward the outer circumference; a second sealing gasket (26) is sandwiched between the second limiting flange (25) and the bottom of the valve body (1).

9. The anti-scour sealing stop valve according to claim 1, characterized in that: The upper end of the valve disc (4) is provided with an upper cavity (27) whose inner diameter is larger than the outer diameter of the valve stem (3); the inner end of the valve stem (3) extends into the upper cavity (27); the portion of the valve stem (3) located in the upper cavity (27) is provided with an annular groove (28) along the circumferential direction; a three-open ring (29) is clamped on the annular groove (28); a limiting sleeve (30) is also provided in the upper cavity (27) and is tightly abutted against the upper end of the three-open ring (29); the inner circumferential surface of the limiting sleeve (30) is in contact with the valve stem. The outer circular surfaces of the limiting sleeve (30) are in contact with the inner circular surface of the upper cavity (27); the outer circular surface of the valve flap (4) is provided with a plurality of screw holes (31) in a circular array and connected with the upper cavity (27); the outer circumference of the limiting sleeve (30) is provided with an annular limiting groove (32); the screw hole (31) is threadedly connected with an inner hexagonal stud (33), and the inner end of the inner hexagonal stud (33) extends into the annular limiting groove (32).

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