Adjusting ball valve with movable valve seat

Abstract

The utility model discloses a movable valve seat adjusting ball valve which comprises a valve body, a valve rod, a ball body and a valve seat, an inlet flow channel, a middle cavity and an outlet flow channel which are communicated with one another are sequentially arranged in the valve body, the valve rod is connected with the ball body, and the valve seat is installed in the inlet flow channel and used for abutting against the ball body to form sealing fit when the valve is closed. Opposite hole plates are arranged in the middle of the ball body, the valve seat can be arranged in the inlet flow channel in a sliding mode in the axial direction, an annular cavity is formed in the inner wall of the inlet flow channel in the circumferential direction, a sliding part extending towards the periphery is arranged on the valve seat, the outer circle face of the sliding part is attached to the inner circle face of the annular cavity, and the annular cavity is divided into a first cavity and a second cavity through the sliding part. The outer wall of the valve body is provided with a first medium channel and a second medium channel which are communicated with the first cavity and the second cavity respectively. The valve not only has a flow adjusting function, but also greatly reduces friction force borne by the valve seat during opening and closing operation, so that the opening and closing operation is easier, and the service life of the valve is longer.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a movable valve seat regulating 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 utility model patent with patent publication (announcement) number CN205639682U discloses a regulating ball valve, which includes a valve body, a valve cover, a ball, a valve seat, a valve stem and a driving mechanism for driving the valve stem to rotate. The valve body is provided with a valve cavity and a medium inlet and a medium outlet communicated with the valve cavity. The ball is arranged in the valve cavity and is linked to the valve stem. The ball includes a closing portion capable of closing the medium inlet and the medium outlet and a conducting portion capable of conducting the medium inlet and the medium outlet. The conducting portion includes a conducting entry portion, an intermediate through groove and a conducting outflow portion which are sequentially connected from the medium inlet to the medium outlet. The conducting entry portion is provided with a plurality of inlet through holes distributed in parallel with each other, and the conducting outflow portion is provided with a plurality of outflow through holes distributed in parallel with each other. The inner ends of the inlet through holes and the inner ends of the outflow through holes are both connected with the intermediate through groove. Since the valve seat of the regulating ball valve is always pressed against the spherical surface of the ball during the opening and closing process, the rotational resistance of the ball is large and the wear on the valve seat is also large, which reduces the service life of the regulating ball valve and increases the user's cost of use. Utility Model Content

[0004] The purpose of the utility model is to provide a movable valve seat regulating ball valve, which not only has the function of flow regulation, but also greatly reduces the friction force on the valve seat during opening and closing operations, making the opening and closing operations easier and extending the service life of the valve.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a movable valve seat regulating ball valve, comprising a valve body, a valve stem, a ball and a valve seat, wherein the valve body is sequentially provided with an inlet flow channel, a middle cavity and an outlet flow channel which are interconnected, the valve stem passes through the valve body and is linked to the ball arranged in the middle cavity, the valve seat is installed in the inlet flow channel for abutting against the ball and forming a sealing fit when the valve is closed; a split orifice plate is provided in the middle of the ball body, the valve seat can be slidably arranged in the inlet flow channel along the axial direction, and an annular cavity is circumferentially provided on the inner wall of the inlet flow channel, the valve seat is provided with a sliding portion extending toward the outer circumference, and the outer circular surface of the sliding portion is in contact with the inner circular surface of the annular cavity, the sliding portion divides the annular cavity into a first chamber and a second chamber, and a first medium channel and a second medium channel which are respectively connected to the first chamber and the second chamber are provided on the outer wall of the valve body.

[0006] By adopting the above technical solution, the valve seat can move toward or away from the ball under the thrust of the external medium, and then cooperate with the external actuator to operate the valve stem to rotate, thereby driving the ball to rotate to realize the opening and closing of the valve, which greatly reduces the friction force on the valve seat during opening and closing operations, making opening and closing operations easier and the service life of the valve longer; and a split orifice plate is set in the middle of the ball. When the ball valve opens in different degrees, the angle at which the medium flows through the orifice plate is different, so that the flow rate or pressure at the outlet reaches a constant value, realizing the function of flow regulation.

[0007] The utility model is further configured such that an installation groove is opened inwardly at the outer end of the inlet flow channel, and a pressure plate is detachably mounted on the valve body at a position corresponding to the outer end of the inlet flow channel through fasteners, and the space between the pressure plate and the inner end of the installation groove forms the annular cavity.

[0008] The adoption of the above technical solution facilitates the processing of the annular cavity and the disassembly and assembly of the movable valve seat.

[0009] The utility model is further configured such that a limiting flange is provided at the inner end of the pressure plate for limiting the axial stroke of the sliding part, a clearance space is formed between the outer circular surface of the limiting flange and the inner circular surface of the annular cavity, and the inner end of the first medium channel is connected to the clearance space.

[0010] By adopting the above technical solution, it can be ensured that the medium can flow into and out of the first chamber smoothly, so that the valve seat can move smoothly.

[0011] The present invention is further configured such that the inner end of the second medium channel is arranged on the inner end surface of the mounting groove, and an annular recess is provided on an end surface of the sliding portion close to the sphere, and the orthographic projection of the inner end of the second medium channel on the sliding portion falls within the range of the annular recess.

[0012] By adopting the above technical solution, it can be ensured that the medium can flow into and out of the second chamber smoothly, so that the valve seat can move smoothly.

[0013] The utility model is further configured such that the outer circular surface of the valve seat is provided with a first sealing ring for forming a sealing fit with the inner circular surface of the pressure plate and a second sealing ring for forming a sealing fit with the inner circular surface of the inlet flow channel, and the outer circular surface of the sliding part is provided with a third sealing ring for forming a sealing fit with the inner circular surface of the annular cavity.

[0014] By adopting the above technical solution, the sealing performance between the valve seat and each matching part can be ensured, and leakage of the medium can be avoided.

[0015] The utility model is further configured such that an annular groove is provided at one end of the sphere close to the valve seat, and a spherical sealing ring for cooperating with the valve seat is mounted on the annular groove via a fastener.

[0016] By adopting the above technical solution, a detachable spherical sealing ring is provided on the sphere. When the spherical sealing ring is worn or aged, it only needs to be replaced, which greatly reduces the subsequent maintenance cost.

[0017] The utility model is further configured such that a threaded groove is provided on the outer periphery of the valve seat, and a metal sealing ring is threadedly connected to the threaded groove for pressing tightly against the ball when the valve is closed.

[0018] By adopting the above technical solution, a detachable metal sealing ring is provided on the valve seat. When the metal sealing ring is worn or aged, it only needs to be replaced, which greatly reduces the subsequent maintenance cost.

[0019] The utility model is further configured such that an annular groove for embedding a soft sealing ring is provided at one end of the metal sealing ring close to the sphere, and a tightening flange is respectively provided on the inner and outer surfaces of the annular groove.

[0020] By adopting the above technical solution, a soft sealing ring is embedded in the annular groove of the metal sealing ring to achieve a soft sealing function, and the sealing type can be flexibly selected according to the use environment.

[0021] The utility model is further configured such that an elastic sealing gasket is sandwiched between the metal sealing ring and the inner end surface of the thread groove.

[0022] By adopting the above technical solution, not only the sealing performance between the metal sealing ring and the valve seat can be ensured, but also when the metal sealing ring is tightened, the elastic sealing gasket can exert a reverse force on the metal sealing ring, thereby increasing the thread friction between the metal sealing ring and the valve seat and achieving an anti-loosening effect.

[0023] The utility model is further configured to include an O-ring, a first annular sealing groove is provided on the outer circumferential surface of the valve seat corresponding to the threaded groove, a second annular sealing groove is provided on the inner circumferential surface of the metal sealing ring, part of the O-ring is embedded in the first annular sealing groove, and the other part of the O-ring is embedded in the second annular sealing groove, and a conical guide surface is provided on the end of the metal sealing ring away from the sphere.

[0024] By adopting the above technical solution, the sealing performance between the metal sealing ring and the valve seat can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of the middle part A;

[0027] Figure 3 for Figure 1 Schematic diagram of the enlarged structure of part B in the middle.

[0028] In the figure: 1. valve body; 2. valve stem; 3. sphere; 4. valve seat; 5. inlet flow channel; 6. middle cavity; 7. outlet flow channel; 8. orifice plate; 9. annular cavity; 10. sliding part; 11. first chamber; 12. second chamber; 13. first medium channel; 14. second medium channel; 15. mounting groove; 16. pressure plate; 17. limiting flange; 18. clearance space; 19. annular recess; 20. first sealing ring; 21. second sealing ring; 22. third sealing ring; 23. annular groove; 24. spherical sealing ring; 25. threaded groove; 26. metal sealing ring; 27. annular clamping groove; 28. tightening flange; 29. elastic sealing gasket; 30. O-ring; 31. first annular sealing groove; 32. second annular sealing groove; 33. tapered guide surface DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example: As shown in the attached Figures 1 to 3The movable valve seat regulating ball valve shown in the figure includes a valve body 1, a valve stem 2, a ball 3 and a valve seat 4. The valve body 1 is sequentially provided with an inlet flow channel 5, a middle cavity 6 and an outlet flow channel 7 that are interconnected. The valve stem 2 passes through the valve body 1 and is linked to the ball 3 provided in the middle cavity 6. The valve seat 4 is installed in the inlet flow channel 5 and is used to abut against the ball 3 and form a sealing fit when the valve is closed; a split orifice plate 8 is provided in the middle of the ball 3, and the valve seat 4 can be slidably arranged in the inlet flow channel 5 along the axial direction, and the inlet An annular cavity 9 is circumferentially provided on the inner wall of the flow channel 5, and a sliding portion 10 extending toward the outer circumference is provided on the valve seat 4, and the outer circumferential surface of the sliding portion 10 is in contact with the inner circumferential surface of the annular cavity 9. The sliding portion 10 divides the annular cavity 9 into a first chamber 11 and a second chamber 12. A first medium channel 13 and a second medium channel 14 are respectively connected to the first chamber 11 and the second chamber 12 on the outer wall of the valve body 1. The first medium channel 13 and the second medium channel 14 can be connected to an external oil pipe to realize the passage or discharge of hydraulic oil. The valve seat 4 is acted upon by the thrust of the external medium and can move toward or away from the sphere 3. The valve stem 2 is then rotated in conjunction with the external actuator to drive the sphere 3 to rotate, thereby realizing the opening and closing of the valve. This greatly reduces the friction force on the valve seat 4 during the opening and closing operations, making the opening and closing operations easier and the service life of the valve longer. A split orifice plate 8 is provided in the middle of the sphere 3. When the ball valve is opened in different degrees, the angle at which the medium flows through the orifice plate 8 is different, so that the flow rate or pressure at the outlet reaches a constant value, thereby realizing the function of flow regulation.

[0031] As attached Figure 1 and attached Figure 2 As shown, the outer end of the inlet flow channel 5 is provided with an inward mounting groove 15, and the valve body 1 is detachably mounted with a pressure plate 16 at a position corresponding to the outer end of the inlet flow channel 5 via fasteners, such as screws. The space between the pressure plate 16 and the inner end of the mounting groove 15 forms the annular cavity 9. This design facilitates the processing of the annular cavity 9 and the disassembly and assembly of the movable valve seat 4.

[0032] As attached Figure 2 As shown, a limiting flange 17 is provided at the inner end of the pressure plate 16 for limiting the axial travel of the sliding portion 10. A clearance space 18 is formed between the outer circumferential surface of the limiting flange 17 and the inner circumferential surface of the annular cavity 9. The inner end of the first medium channel 13 communicates with the clearance space 18. This design ensures smooth flow of medium into and out of the first chamber 11, thereby enabling smooth movement of the valve seat 4.

[0033] As attached Figure 2As shown, the inner end of the second medium channel 14 is disposed on the inner end surface of the mounting groove 15, and an annular recess 19 is provided on the end surface of the sliding portion 10 close to the sphere 3. The orthographic projection of the inner end of the second medium channel 14 on the sliding portion 10 falls within the range of the annular recess 19. This design ensures smooth flow of medium into and out of the second chamber 12, thereby enabling smooth movement of the valve seat 4.

[0034] As attached Figure 2 As shown, the outer surface of the valve seat 4 is mounted with a first sealing ring 20 for sealingly cooperating with the inner surface of the pressure plate 16, and a second sealing ring 21 for sealingly cooperating with the inner surface of the inlet flow channel 5. The outer surface of the sliding portion 10 is mounted with a third sealing ring 22 for sealingly cooperating with the inner surface of the annular cavity 9. This design ensures the sealing between the valve seat 4 and each mating part, preventing medium leakage.

[0035] As attached Figure 3 As shown, an annular groove 23 is defined at one end of the ball 3 near the valve seat 4. A ball sealing ring 24 is mounted on the annular groove 23 via fasteners, such as screws, and is made of polytetrafluoroethylene rubber. The detachable ball sealing ring 24 on the ball 3 allows for replacement of the ball sealing ring 24 when it becomes worn or aged, significantly reducing subsequent maintenance costs.

[0036] As attached Figure 3 As shown, the outer periphery of the valve seat 4 is provided with a threaded groove 25, onto which is threadedly connected a metal sealing ring 26 for abutting against the ball 3 when the valve is closed. That is, the inner periphery of the metal sealing ring 26 has an internal thread that mates with the threaded groove 25. The metal sealing ring 26 serves as part of the valve seat 4, and the second sealing ring 21 is provided on the metal sealing ring 26. The detachable metal sealing ring 26 is provided on the valve seat 4. When the metal sealing ring 26 is worn or aged, it only needs to be replaced, which greatly reduces subsequent maintenance costs.

[0037] As attached Figure 3 As shown, the metal sealing ring 26 has an annular groove 27 at one end near the sphere 3 for inserting a soft sealing ring, and the inner and outer surfaces of the annular groove 27 are each provided with a tightening flange 28. Inserting the soft sealing ring in the annular groove 27 of the metal sealing ring 26 achieves a soft seal, and the sealing type can be flexibly selected according to the usage environment.

[0038] As attached Figure 3As shown, an elastic sealing gasket 29 is sandwiched between the metal sealing ring 26 and the inner end surface of the thread groove 25. The elastic sealing gasket 29 can be a rubber gasket. This design not only ensures the sealing between the metal sealing ring 26 and the valve seat 4, but also, when the metal sealing ring 26 is tightened, the elastic sealing gasket 29 can exert a reverse force on the metal sealing ring 26, thereby increasing the thread friction between the metal sealing ring 26 and the valve seat 4 and preventing it from loosening.

[0039] As attached Figure 3 As shown, the ball valve also includes an O-ring 30. A first annular sealing groove 31 is defined on the outer circumferential surface of the valve seat 4 corresponding to the threaded groove 25. A second annular sealing groove 32 is defined on the inner circumferential surface of the metal sealing ring 26. Part of the O-ring 30 is embedded in the first annular sealing groove 31, while the other part is embedded in the second annular sealing groove 32. A tapered guide surface 33 is provided on the end of the metal sealing ring 26 away from the ball 3. This design can further enhance the sealing performance between the metal sealing ring 26 and the valve seat 4.

[0040] Working Principle: The movable-seat regulating ball valve is closed and opened by the actuator driving the rotation of the valve stem 2 and ball 3. When the actuator rotates counterclockwise, the ball valve opens, and when it rotates clockwise, the ball valve closes. Before opening the valve, pressurized oil enters the second medium channel 14 and is discharged from the first medium channel 13, pushing the valve seat 4 leftward. Once in position, the actuator drives the rotation of the valve stem 2 and ball 3 to open the valve. When the actuator rotates counterclockwise, the ball valve opens. The actuator drives the rotation of the valve stem 2 and ball 3 to close the valve. When the actuator rotates clockwise, the ball valve closes. Pressurized oil enters the first medium channel 13 and is discharged from the second medium channel 14, pushing the valve seat 4 rightward. Once in position, the ball valve closes.

[0041] Ball valve adjustment: Since there is a split orifice plate 8 in the middle of the ball body 3 of the ball valve, the angle at which the medium flows through the orifice plate 8 is different at different openings of the ball valve, so that the flow or pressure of the outlet flow channel 7 reaches a constant value. The flow or pressure of this regulating ball valve increases as the valve opening increases.

Claims

1. A movable valve seat regulating ball valve, comprising a valve body (1), a valve stem (2), a ball (3) and a valve seat (4), wherein the valve body (1) is provided with an inlet flow channel (5), a middle cavity (6) and an outlet flow channel (7) which are interconnected in sequence, the valve stem (2) passes through the valve body (1) and is linked to the ball (3) provided in the middle cavity (6), and the valve seat (4) is installed in the inlet flow channel (5) to abut against the ball (3) and form a sealing fit when the valve is closed; and characterized in that: A split orifice plate (8) is provided in the middle of the sphere (3), the valve seat (4) can be slidably arranged in the inlet flow channel (5) along the axial direction, and an annular cavity (9) is circumferentially provided on the inner wall of the inlet flow channel (5), the valve seat (4) is provided with a sliding portion (10) extending toward the outer periphery, and the outer circular surface of the sliding portion (10) is in contact with the inner circular surface of the annular cavity (9), and the sliding portion (10) divides the annular cavity (9) into a first chamber (11) and a second chamber (12), and a first medium channel (13) and a second medium channel (14) are provided on the outer wall of the valve body (1) and are respectively connected to the first chamber (11) and the second chamber (12).

2. The movable seat regulating ball valve according to claim 1, characterized in that: The outer end of the inlet flow channel (5) is provided with an installation groove (15) facing inward, and the valve body (1) is detachably mounted with a pressure plate (16) at a position corresponding to the outer end of the inlet flow channel (5) via fasteners, and the space between the pressure plate (16) and the inner end of the installation groove (15) forms the annular cavity (9).

3. The movable seat regulating ball valve according to claim 2, characterized in that: The inner end of the pressure plate (16) is provided with a limiting flange (17) for limiting the axial stroke of the sliding portion (10), and a clearance space (18) is formed between the outer circular surface of the limiting flange (17) and the inner circular surface of the annular cavity (9), and the inner end of the first medium channel (13) is connected to the clearance space (18).

4. The movable seat regulating ball valve according to claim 2, characterized in that: The inner end of the second medium channel (14) is arranged on the inner end surface of the mounting groove (15), and an annular recess (19) is provided on an end surface of the sliding portion (10) close to the sphere (3), and the orthographic projection of the inner end of the second medium channel (14) on the sliding portion (10) falls within the range of the annular recess (19).

5. The movable seat regulating ball valve according to claim 1, characterized in that: The outer circular surface of the valve seat (4) is provided with a first sealing ring (20) for forming a sealing fit with the inner circular surface of the pressure plate (16) and a second sealing ring (21) for forming a sealing fit with the inner circular surface of the inlet flow channel (5). The outer circular surface of the sliding portion (10) is provided with a third sealing ring (22) for forming a sealing fit with the inner circular surface of the annular cavity (9).

6. The movable seat regulating ball valve according to claim 1, characterized in that: An annular groove (23) is formed at one end of the sphere (3) close to the valve seat (4), and a spherical sealing ring (24) for matching with the valve seat (4) is mounted on the annular groove (23) via a fastener.

7. The movable seat regulating ball valve according to claim 1, characterized in that: A threaded groove (25) is provided on the outer periphery of the valve seat (4), and a metal sealing ring (26) is threadedly connected to the threaded groove (25) for tightly contacting the ball (3) when the valve is closed.

8. The movable seat regulating ball valve according to claim 7, characterized in that: An annular groove (27) for embedding a soft sealing ring is provided at one end of the metal sealing ring (26) close to the sphere (3), and a tightening flange (28) is provided on the inner and outer surfaces of the annular groove (27).

9. The movable seat regulating ball valve according to claim 7, characterized in that: An elastic sealing gasket (29) is sandwiched between the metal sealing ring (26) and the inner end surface of the thread groove (25).

10. The movable seat regulating ball valve according to claim 7, characterized in that: It also includes an O-ring (30), a first annular sealing groove (31) is provided on the outer circumferential surface of the valve seat (4) corresponding to the thread groove (25), a second annular sealing groove (32) is provided on the inner circumferential surface of the metal sealing ring (26), a portion of the O-ring (30) is embedded in the first annular sealing groove (31), and another portion of the O-ring (30) is embedded in the second annular sealing groove (32), and a conical guide surface (33) is provided on the end of the metal sealing ring (26) away from the sphere (3).

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