Centralized V-shaped adjusting ball valve

Abstract

The invention discloses a positive V-shaped adjusting ball valve, and aims to provide a positive V-shaped adjusting ball valve which is good in sealing performance, long in service life and capable of effectively solving the problem that the sealing performance and the service life between a valve seat and a spherical surface of a valve element are affected due to abrasion of a sealing surface in the using process of the valve. The valve comprises a valve body, a valve element, a valve seat and a valve seat sealing assembly, an inlet and an outlet are formed in the valve body, the valve seat sealing assembly comprises a threaded sleeve, the threaded sleeve is connected into the inlet of the valve body in a threaded mode, the valve seat is arranged in the inlet in a sliding mode, the valve seat is provided with a valve seat sleeve extending in the direction of the threaded sleeve, and an annular cavity is formed between the valve seat sleeve and the inner wall of the inlet; the sliding base, the elastic element and the valve seat pressing ring are sequentially arranged in the annular cavity, the sliding base is in sliding sealing connection with the outer wall of the valve seat sleeve and the inner wall of the inlet, and the valve seat abuts against the valve element under the action of the elastic element so that the valve seat can be in sealing connection with the valve element.

Description

Technical Field

[0001] The present invention relates to the field of valve equipment, and particularly to a centric V-type regulating ball valve. Background Art

[0002] Since the valve core of an eccentric V-type ball valve has a certain offset distance from the center line of the valve body flow channel, the valve core sealing surface and the valve seat sealing surface are in a non-contact state except at the fully closed position, which cannot meet the working conditions of precise flow regulation. At the same time, due to the certain offset distance between the valve body and the valve core, the processing / measurement difficulty increases; and the valve seat position is immovable, and due to the cumulative processing error during assembly, it may be necessary to separately adapt the valve core and the valve seat sealing surface, increasing the difficulty and cost of manufacturing and maintenance. In addition, after using for a period of time later, on-line maintenance and repair are relatively difficult, and there is a risk of leakage after the sealing surface is worn, and the service life of the valve is relatively short.

[0003] The valve core of the centric V-type ball valve is consistent with the center line of the valve body flow channel, which can effectively solve the deficiencies of the eccentric V-type ball valve. The centric V-type ball valve has both cutting and regulating functions at the same time. The valve core is designed with a V-shaped notch with a special shape and contacts the valve seat during the closing process, having a large shearing force and self-cleaning function, especially suitable for working conditions of media containing fibers or tiny solid particles. It is widely used in the automatic control systems of industrial departments such as papermaking, chemical industry, petroleum, chemical fiber, electric power, metallurgy, pharmacy, and environmental protection.

[0004] At present, the valve seat of the centric V-type ball valve is generally fixedly arranged or pressed on the valve core through a threaded sleeve. Among them, for the centric V-type ball valve with the valve seat fixedly arranged, due to the influence of manufacturing precision and cumulative error, there is a problem of poor sealing between the valve seat and the spherical surface of the valve core; and there is also a problem that the sealing performance between the valve seat and the spherical surface of the valve core is affected due to the wear of the sealing surface during the use of the valve. For the centric V-type ball valve with the valve seat pressed on the valve core through a threaded sleeve, there is also a problem that the sealing performance between the valve seat and the spherical surface of the valve core is affected due to the wear of the sealing surface during the use of the valve. For example, for the V-type ball valve with the invention creation name of V-type ball valve disclosed in Chinese Patent Publication No. CN117189905A, there is also a problem that the sealing performance and service life between the valve seat and the spherical surface of the valve core are affected due to the wear of the sealing surface during the use of the valve. Summary of the Invention

[0005] The purpose of the present invention is to provide a centric V-type regulating ball valve with good sealing performance, long service life, and capable of effectively solving the problems that the sealing performance and service life between the valve seat and the spherical surface of the valve core are affected due to the wear of the sealing surface during the use of the valve.

[0006] The technical solution of the present invention is: A centric V-type regulating ball valve, comprising a valve body, a valve core and a valve seat, with an inlet and an outlet provided on the valve body; further comprising a valve seat sealing assembly, which includes: A threaded sleeve, threadedly connected inside the inlet of the valve body, the valve seat is slidably arranged inside the inlet, a valve seat sleeve extending towards the threaded sleeve is provided on the valve seat, and an annular cavity is formed between the valve seat sleeve and the inner wall of the inlet; A sliding base, an elastic element and a valve seat pressing ring are sequentially arranged in the annular cavity. The sliding base is slidably and sealingly connected between the outer wall of the valve seat sleeve and the inner wall of the inlet. The sliding base abuts against the threaded sleeve under the action of the elastic element, the valve seat pressing ring abuts against the valve seat under the action of the elastic element, and the valve seat abuts against the valve core under the action of the elastic element, so that the valve seat is sealingly connected to the valve core. In the centric V-type regulating ball valve of this solution, the valve seat abuts against the valve core under the action of the elastic element, so that the valve seat is sealingly connected to the valve core; at the same time, the compression amount of the elastic element can be adjusted by rotating the threaded sleeve to ensure that there is sufficient pre-tightening force between the valve seat and the valve core, thereby ensuring the sealing performance between the valve seat and the valve core. On the other hand, during the use of the valve, when the sealing surface between the valve seat and the valve core wears, the valve seat will abut against the valve core under the action of the elastic element to ensure good sealing connection performance between the valve seat and the valve core, thus effectively solving the problem that the sealing performance and service life between the valve seat and the spherical surface of the valve core are affected due to the wear of the sealing surface during the use of the valve. Therefore, a centric V-type regulating ball valve of this application has the characteristics of good sealing performance and long service life.

[0007] Preferably, the valve seat sealing assembly further includes an inner cone end ring, which is located between the valve seat pressing ring and the valve seat. One end of the inner cone end ring facing the valve seat is an end ring cone surface, and the inner edge of the end ring cone surface is inclined towards the valve seat pressing ring side. A valve seat cone surface cooperating with the end ring cone surface is provided on the valve seat. The inner cone end ring makes the end ring cone surface sealingly connected to the valve seat cone surface under the action of the elastic element, and makes the inner cone end ring sealingly connected to the inner wall of the inlet. Since the inner cone end ring makes the end ring cone surface press against the valve seat cone surface under the action of the elastic element, not only can the end ring cone surface be sealingly connected to the valve seat cone surface, but also under the combined action of the elastic element and the cone surface, the inner cone end ring will expand outwards, making the inner cone end ring sealingly connected to the inner wall of the inlet; at the same time, since the sliding base is slidably and sealingly connected between the outer wall of the valve seat sleeve and the inner wall of the inlet, this can effectively avoid the problem that tiny particulate media enters the space where the elastic element is located and accumulates at the position of the elastic element, affecting the normal operation of the elastic element and even causing the elastic element to fail.

[0008] Preferably, a scraper is provided on the valve seat and is engaged with the spherical surface of the outer wall of the valve core. Under the action of an elastic element, the scraper abuts against the spherical surface of the outer wall of the valve core. This design enables the centering V-type regulating ball valve to have a self-cleaning function. During the opening and closing process of the valve, the scraper can scrape off media such as particles, fibers, and crystals adhering to the sealing surface of the valve core, protecting the sealing surface of the valve core, and thus ensuring effective sealing between the valve seat and the valve core during long-term use.

[0009] Preferably, it further includes a cleaning structure, which includes: A cleaning channel is provided on the valve seat. The annular cavity between the sliding base and the valve seat pressing ring forms an installation cavity. The elastic element is located in the installation cavity. The cleaning channel communicates the outer wall of the valve seat with the installation cavity. One end of the cleaning channel is provided with a detachable sealing plug; A discharge channel is provided on the valve seat. The cleaning channel and the discharge channel are located on opposite sides of the annular cavity. The discharge channel communicates the outer wall of the valve seat with the installation cavity. One end of the discharge channel is provided with a detachable sealing plug. During the long-term use of the current centering V-type regulating ball valve, if particulate medium enters the space where the elastic element is located and affects the normal operation of the elastic element, the valve needs to be disassembled from the pipeline, and then the valve is disassembled to clean the space where the elastic element is located, and then the valve is assembled and installed on the pipeline; this not only has cumbersome operation steps, low efficiency, but also affects the normal operation of the pipeline. To solve these problems, this solution specifically provides a cleaning structure. During the long-term use of the centering V-type regulating ball valve, the space where the elastic element is located can be regularly cleaned through the cleaning structure without disassembling the valve and without affecting the normal operation of the pipeline, so as to avoid the accumulation of fine particulate medium at the position of the elastic element, which affects the normal operation of the elastic element and even causes the elastic element to fail. Specifically, open the sealing plugs on the cleaning channel and the discharge channel; then, inject a fluid medium (such as air or water) into the installation cavity through the cleaning channel, and then discharge it through the discharge channel. During this process, the fluid medium will drive the particulate medium in the installation cavity to be discharged; then, seal the cleaning channel and the discharge channel through the sealing plugs; thus, by regularly cleaning the space where the elastic element is located, the problem of fine particulate medium accumulating at the position of the elastic element, which affects the normal operation of the elastic element and even causes the elastic element to fail, can be avoided.

[0010] Preferably, the cleaning structure further includes a buffer cavity formed in the annular cavity between the valve seat pressing ring and the valve seat. There is a gap between the valve seat pressing ring and the valve seat sleeve, and this gap constitutes a connection channel connecting the placement inner cavity and the buffer cavity. On the end face of the valve seat pressing ring facing the elastic element, there are several chip removal grooves. The chip removal grooves extend radially along the valve seat sleeve and connect the connection channel with the outer wall of the valve seat pressing ring. There is an annular groove on the inner wall of the inlet, and there are several communication holes on the valve seat pressing ring that connect the annular groove with the buffer cavity. One end of the discharge channel is connected to the outer wall of the valve seat, and the other end of the discharge channel is connected to the annular groove. The elastic element generally uses a disc spring (the disc spring has a compact structure and large elasticity). During the process of the fluid medium flowing through the placement inner cavity, in order to prevent particulate media from getting stuck between the disc spring and the valve seat pressing ring and the particulate media that has not been discharged in time from staying in the placement inner cavity, which may affect the normal operation of the elastic element; this solution further improves the cleaning structure. Specifically, when the cleaning structure works, After the fluid medium (such as air or water) is injected into the placement inner cavity through the cleaning channel, it flows into the buffer cavity through the connection channel. Then, it flows into the annular groove through the communication hole, and then is discharged through the discharge channel. During this process, the particulate media between the disc spring and the valve seat pressing ring will flow into the buffer cavity through the chip removal groove and the connection channel, and then be discharged; while the particulate media that has not been discharged in time will stay in the buffer cavity and / or the annular groove, thus effectively preventing particulate media from getting stuck between the disc spring and the valve seat pressing ring and the particulate media that has not been discharged from staying in the placement inner cavity, which may affect the normal operation of the elastic element.

[0011] Preferably, it further includes: A valve stem rotatably arranged in the valve stem installation hole of the valve body, and the valve stem is fixedly connected to the valve core; A bottom plug shaft arranged on the valve body and coaxially distributed with the valve stem. The bottom plug shaft and the valve stem are located on opposite sides of the valve core, and the bottom plug shaft is rotatably connected to the valve core. Since the valve core is supported by the valve stem and the bottom plug shaft together, the stability of the valve core can be ensured, and the excessive torque caused by the huge sealing load formed by the inlet pressure pushing the valve core against the valve seat can be eliminated, which may affect the sealing performance between the valve core and the valve seat, thereby improving the sealing performance between the valve core and the valve seat.

[0012] Preferably, it further includes: A retaining ring, a clamping groove is provided on the outer wall of the valve stem near the valve core, and the retaining ring is clamped in the clamping groove; An upper guide sleeve sleeved on the valve stem, located in the valve stem installation hole; A retaining ring ring sleeved on the valve stem, and the retaining ring ring is located between the upper guide sleeve and the retaining ring; The stuffing box is fixed to the valve body by bolts. There is a valve stem through-hole on the stuffing box. The valve stem passes through the valve stem through-hole. The valve core and the upper guide sleeve are on the same side of the stuffing box. Through the cooperation of the retaining ring, the upper guide sleeve, the retaining ring washer and the stuffing box, the valve stem can be restricted within the valve stem installation hole, effectively preventing the valve stem from ejecting.

[0013] Preferably, it further includes: A valve stem, which is rotatably arranged in the valve stem installation hole of the valve body and is fixedly connected to the valve core; A stuffing box, which is fixed to the valve body by bolts. There is a sealing ring between the stuffing box and the valve body. There is a valve stem through-hole on the stuffing box. The valve stem passes through the valve stem through-hole. There is a stuffing cavity between the stuffing box and the valve stem, and the stuffing cavity is provided with packing; A packing gland and a packing sleeve. The valve body passes through the packing sleeve and the packing gland in sequence. The packing sleeve is located between the packing gland and the packing. The packing sleeve is connected to the valve body or the stuffing box by bolts, and the packing sleeve presses tightly on the packing. In this solution, the design of a separate stuffing box can also achieve online addition or replacement of the packing in the later stage, ensuring the safety of valve use and increasing the service life of the valve. At the same time, the split design of the packing gland and the packing sleeve is convenient for on-site installation and later maintenance.

[0014] Preferably, one end of the packing sleeve facing the packing gland is a sleeve spherical surface, and the packing gland is provided with a gland spherical surface that cooperates with the sleeve spherical surface. The gland spherical surface presses against the sleeve spherical surface. The packing gland and the packing sleeve are in spherical contact, so that the packing sleeve always presses vertically on the packing, avoiding the packing sleeve being driven to tilt and press on the packing due to the inclination of the packing gland, thereby improving the sealing effect of the packing.

[0015] Preferably, it further includes: A valve stem, which is rotatably arranged in the valve stem installation hole of the valve body and is fixedly connected to the valve core; A rotating actuator, which is arranged on the valve body and drives the valve stem to rotate. During specific operation, the rotating actuator drives the valve stem to rotate, thereby driving the valve core to rotate within a 90-degree range, separating a part of the sealing surface of the valve core from the valve seat, allowing the medium to flow through the valve, and realizing the automatic opening and closing and flow regulation of the valve.

[0016] The beneficial effects of the present invention are: good sealing performance, long service life, and it can effectively solve the problem that the sealing performance and service life between the valve seat and the spherical surface of the valve core are affected due to the wear of the sealing surface during the use of the valve. Brief Description of the Drawings

[0017] Figure 1 It is a schematic cross-sectional structure diagram of a concentric V-type regulating ball valve of the present invention.

[0018] Figure 2It is a schematic diagram of a partial cross-sectional structure at the valve seat sealing assembly of a regular-centered V-type regulating ball valve according to the second specific embodiment of the present invention.

[0019] Figure 3 It is Figure 2 a partial enlarged view of the position A in

[0020] Figure 4 a schematic diagram of a partial cross-sectional structure at the valve stem of a regular-centered V-type regulating ball valve according to the second specific embodiment of the present invention.

[0021] Figure 5 a schematic diagram of a partial structure at the valve stem rotation limiting structure of a regular-centered V-type regulating ball valve according to the second specific embodiment of the present invention.

[0022] Figure 6 a schematic diagram of a partial cross-sectional structure at the valve seat sealing assembly of a regular-centered V-type regulating ball valve according to the third specific embodiment of the present invention.

[0023] In the figure: Valve body 1, inlet 1.1; Valve core 2; Valve seat 3, valve seat sleeve 3.1, valve seat sealing surface 3.2, scraper 3.3; Valve seat sealing assembly 4, threaded sleeve 4.1, sliding base 4.2, elastic element 4.3, valve seat retaining ring 4.4, inner tapered end ring 4.5, chip removal groove 4.6, radial groove 4.7; Valve stem 5; Bottom plug shaft 6; Rotating actuator 7; Bracket 8; Upper guide sleeve 9; Packing gland 10; Sealing packing 11; Packing gland 12, gland spherical surface 12.1; Packing pressing plate 13; Circlip 14; Circlip ring 15; Limit block 16; Cleaning channel 17; Placement cavity 18; Annular groove 19; Communication hole 20; Buffer cavity 21; Connection channel 22. Specific embodiments

[0024] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments: Specific embodiment one, as Figure 1 ,Figure 2 As shown in the figure, a regular-centered V-type regulating ball valve includes a valve body 1, a valve core 2, a valve seat 3 and a valve seat sealing assembly 4. The valve body 1 is provided with a valve body cavity, an inlet 1.1 and an outlet connected to the connecting cylinder of the valve body cavity. The valve seat 3 is slidably arranged in the inlet. The valve seat sealing assembly 4 includes a threaded sleeve 4.1, a sliding base 4.2, an elastic element 4.3 and a valve seat pressing ring 4.4. The threaded sleeve 4.1 is threadedly connected in the inlet of the valve body 1. The valve seat 3 and the valve body cavity are on the same side of the threaded sleeve 4.1. The valve seat 3 is provided with a valve seat sleeve 3.1 extending towards the threaded sleeve 4.1. An annular cavity is formed between the valve seat sleeve 3.1 and the inner wall of the inlet.

[0025] The sliding base 4.2, the elastic element 4.3 and the valve seat pressing ring 4.4 are sequentially arranged in the annular cavity. Specifically, the sliding base 4.2, the elastic element 4.3 and the valve seat pressing ring 4.4 are sequentially arranged in the annular cavity along the axial direction of the threaded sleeve 4.1. The sliding base 4.2, the elastic element 4.3 and the valve seat pressing ring 4.4 are on the same side of the threaded sleeve 4.1.

[0026] The sliding base 4.2 is in a circular ring shape and is sleeved outside the valve seat sleeve 3.1. The valve seat pressing ring 4.4 is sleeved outside the valve seat sleeve 3.1. The sliding base 4.2 can slide along the valve seat sleeve 3.1. The sliding base 4.2 is in sliding seal connection with the outer wall of the valve seat sleeve 3.1 and the inner wall of the inlet, that is, the sliding base 4.2 is in sliding seal connection with the outer wall of the valve seat sleeve 3.1, and the sliding base 4.2 is in sliding seal connection with the inner wall of the inlet.

[0027] The elastic element 4.3 is located between the sliding base 4.2 and the valve seat pressing ring 4.4. The elastic element 4.3 is a disc spring or a helical spring. In this embodiment, the elastic element 4.3 is a disc spring. The sliding base 4.2 abuts against the threaded sleeve 4.1 under the action of the elastic element 4.3. The valve seat pressing ring 4.4 abuts against the valve seat 3 under the action of the elastic element 4.3. The valve seat 3 abuts against the valve core 2 under the action of the elastic element 4.3 so that the valve seat 3 and the valve core 2 are in sealed connection.

[0028] In this embodiment, the valve seat 3 of the centering V-type regulating ball valve is pressed against the valve core 2 under the action of the elastic element 4.3, so that the valve seat 3 is hermetically connected to the valve core 2. At the same time, the compression amount of the elastic element 4.3 can be adjusted by rotating the threaded sleeve 4.1 to ensure that there is sufficient pre-tightening force between the valve seat 3 and the valve core 2, thereby ensuring the sealing performance between the valve seat 3 and the valve core 2. On the other hand, during the use of the valve, when the sealing surface between the valve seat 3 and the valve core 2 wears, the valve seat 3 will be pressed against the valve core 2 under the action of the elastic element 4.3 to ensure good sealing connection performance between the valve seat 3 and the valve core 2, thereby effectively solving the problem that the sealing performance and service life between the valve seat 3 and the spherical surface of the valve core 2 are affected due to the wear of the sealing surface during the use of the valve. Therefore, a centering V-type regulating ball valve of this embodiment has the characteristics of good sealing performance and long service life.

[0029] Specific Embodiment Two, as Figure 1 、 Figure 2 shown, a centering V-type regulating ball valve includes a valve body 1, a valve core 2, a valve seat 3 and a valve seat sealing assembly 4. A valve body cavity and an inlet 1.1 and an outlet connected to the valve body cavity are provided in the valve body 1. The valve seat 3 is slidably arranged in the inlet.

[0030] The valve seat sealing assembly 4 includes a threaded sleeve 4.1, a sliding base 4.2, an elastic element 4.3 and a valve seat pressing ring 4.4.

[0031] The threaded sleeve 4.1 is threadedly connected to the inlet of the valve body 1. The valve seat 3 and the valve body cavity are on the same side of the threaded sleeve 4.1. A valve seat sleeve 3.1 extending towards the threaded sleeve 4.1 is provided on the valve seat 3. An annular cavity is formed between the valve seat sleeve 3.1 and the inner wall of the inlet.

[0032] The sliding base 4.2, the elastic element 4.3 and the valve seat pressing ring 4.4 are sequentially arranged in the annular cavity. Specifically, the sliding base 4.2, the elastic element 4.3 and the valve seat pressing ring 4.4 are sequentially arranged in the annular cavity along the axial direction of the threaded sleeve 4.1. The sliding base 4.2, the elastic element 4.3 and the valve seat pressing ring 4.4 are on the same side of the threaded sleeve 4.1.

[0033] The sliding base 4.2 is circular-ring-shaped, and the sliding base 4.2 is sleeved outside the valve seat sleeve 3.1. The valve seat pressing ring 4.4 is sleeved outside the valve seat sleeve 3.1. The sliding base 4.2 can slide along the valve seat sleeve 3.1. The sliding base 4.2 is slidably and hermetically connected to the outer wall of the valve seat sleeve 3.1 and the inner wall of the inlet, that is, the sliding base 4.2 is slidably and hermetically connected to the outer wall of the valve seat sleeve 3.1, and the sliding base 4.2 is slidably and hermetically connected to the inner wall of the inlet.

[0034] In one example, sealing rings are provided on both the inner wall and the outer wall of the sliding base 4.2 to enable the sliding base 4.2 to be slidably and hermetically connected to the outer wall of the valve seat sleeve 3.1 and the inner wall of the inlet.

[0035] In another example, graphite sealing rings are provided on both the inner wall and the outer wall of the sliding base 4.2, so that the sliding base 4.2 is slidably and sealingly connected to the outer wall of the valve seat sleeve 3.1 and the inner wall of the inlet. This example utilizes the high-temperature resistance performance of the graphite sealing ring, so that the sliding sealing connection structure between the sliding base 4.2 and the outer wall of the valve seat sleeve 3.1 and the inner wall of the inlet can be adapted to be applied under high and low temperature working conditions.

[0036] The elastic element 4.3 is located between the sliding base 4.2 and the valve seat pressing ring 4.4. The elastic element 4.3 is a disc spring or a helical spring. In this embodiment, the elastic element 4.3 is a disc spring. The sliding base 4.2 abuts against the threaded sleeve 4.1 under the action of the elastic element 4.3. The valve seat pressing ring 4.4 abuts against the valve seat 3 under the action of the elastic element 4.3. The valve seat 3 abuts against the valve core 2 under the action of the elastic element 4.3, so that the valve seat 3 is sealingly connected to the valve core 2.

[0037] In the regular-centered V-type regulating ball valve of this embodiment, the valve seat 3 abuts against the valve core 2 under the action of the elastic element 4.3, so that the valve seat 3 is sealingly connected to the valve core 2; at the same time, the compression amount of the elastic element 4.3 can be adjusted by rotating the threaded sleeve 4.1 to ensure that there is sufficient pre-tightening force between the valve seat 3 and the valve core 2, thereby ensuring the sealing performance between the valve seat 3 and the valve core 2. On the other hand, during the use of the valve, when the sealing surface between the valve seat 3 and the valve core 2 wears, the valve seat 3 will abut against the valve core 2 under the action of the elastic element 4.3 to ensure the good sealing connection performance between the valve seat 3 and the valve core 2, thereby effectively solving the problem that the sealing performance and service life between the spherical surfaces of the valve seat 3 and the valve core 2 are affected due to the wear of the sealing surface during the use of the valve. Therefore, a regular-centered V-type regulating ball valve of this embodiment has the characteristics of good sealing performance and long service life.

[0038] Specifically, as Figure 1 shown, a regular-centered V-type regulating ball valve further includes a valve stem 5 and a rotating actuator 7. The valve stem installation hole of the valve body 1 is communicated with the inner cavity of the valve body. The valve stem 5 is rotatably arranged in the valve stem installation hole of the valve body 1. The valve stem 5 is fixedly connected to the valve core 2. The rotating actuator 7 is arranged on the valve body 1. In this embodiment, the rotating actuator 7 is installed on the valve body 1 through a bracket 8. The rotating actuator 7 drives the valve stem 5 to rotate, so as to open or close the regular-centered V-type regulating ball valve. The rotating actuator 7 is a pneumatic actuator or an electric actuator. Specifically, during operation, the rotating actuator 7 drives the valve stem 5 to rotate, thereby driving the valve core 2 to rotate within a range of 90 degrees, separating a part of the sealing surface of the valve core 2 from the valve seat 3, allowing the medium to flow through the valve, and realizing the automatic opening and closing and flow regulation of the valve.

[0039] In this embodiment, the valve body 1 is an integrally formed structure. The valve core 2 can pass through the outlet on the valve body 1, so that when the valve core 2 is installed, it can enter the inner cavity of the valve body through the outlet, and then be connected to the valve stem 5.

[0040] Furthermore, as Figure 1 shown, a concentric V-type regulating ball valve further includes a bottom plug shaft 6. The bottom plug shaft 6 is arranged on the valve body 1 and is coaxially distributed with the valve stem 5. In this embodiment, the bottom plug shaft 6 is fixed to the valve body 1 by bolts. A sealing ring is provided between the bottom plug shaft 6 and the valve body 1. The bottom plug shaft 6 and the valve stem 5 are located on opposite sides of the valve core 2. The bottom plug shaft 6 is rotatably connected to the valve core 2. In this way, the valve core 2 can be jointly supported by the valve stem 5 and the bottom plug shaft 6 to ensure the stability of the valve core 2, eliminate the excessive torque caused by the huge sealing load formed by the inlet pressure pushing the valve core 2 against the valve seat 3, and affect the sealing performance between the valve core 2 and the valve seat 3, thereby improving the stability of the valve core 2 and the sealing performance between the valve core 2 and the valve seat 3.

[0041] Furthermore, as Figure 1 、 Figure 4 shown, a concentric V-type regulating ball valve further includes a retaining ring 14, an upper guide sleeve 9, a retaining ring 15 and a stuffing box 10. The retaining ring 14, the upper guide sleeve 9 and the stuffing box 10 are sequentially distributed along the axial direction of the valve stem 5. A clamping groove is provided on the outer wall of the valve stem 5 near the valve core 2, and the retaining ring 14 is clamped in the clamping groove. The upper guide sleeve 9 is located in the valve stem installation hole. The upper guide sleeve 9 is sleeved on the valve stem 5. The valve stem 5 is rotatably arranged in the valve stem installation hole through the upper guide sleeve 9. The retaining ring 15 is sleeved on the valve stem 5. The retaining ring 15 is located between the upper guide sleeve 9 and the retaining ring 14. In this embodiment, the retaining ring 15 is further provided with a retaining ring extension extending towards the retaining ring 14, and the retaining ring 14 is located within the retaining ring extension. The stuffing box 10 is fixed to the valve body 1 by bolts. The stuffing box 10 is provided with a valve stem through hole. The valve stem 5 passes through the valve stem through hole. The valve core 2 and the upper guide sleeve 9 are located on the same side of the stuffing box 10. One end of the upper guide sleeve 9 is close to or abuts against the retaining ring 15, and the other end of the upper guide sleeve 9 is close to or abuts against the stuffing box 10. Through the cooperation of the retaining ring 14, the upper guide sleeve 9, the retaining ring 15 and the stuffing box 10, the valve stem 5 can be restricted within the valve stem installation hole, effectively preventing the valve stem 5 from ejecting.

[0042] Furthermore, as Figure 1 、 Figure 4As shown in the figure, a regular-centered V-type regulating ball valve further includes a packing gland 13 and a packing sleeve 12. A sealing ring is provided between the stuffing box 10 and the valve body 1. A packing cavity is provided between the stuffing box 10 and the valve stem 5. The packing cavity is provided with packing 11. An annular limiting boss is provided at one end of the packing cavity close to the upper guide sleeve 9. The valve body 1 passes through the packing sleeve 12 and the packing gland 13 in sequence. The packing 11 is located between the packing sleeve 12 and the annular limiting boss. The packing sleeve 12 is located between the packing gland 13 and the packing 11. The packing sleeve 12 is connected to the valve body 1 or the stuffing box 10 by bolts. The packing sleeve 12 presses tightly on the packing 11. In this solution, the separate design of the stuffing box 10 can also realize the on-line addition or replacement of packing in the later stage, ensuring the safety of valve use and increasing the service life of the valve. At the same time, the split design of the packing gland 13 and the packing sleeve 12 is convenient for on-site installation and later maintenance.

[0043] In one example, the packing 11 adopts a graphite packing seal structure. The graphite packing seal structure includes a molded flexible graphite packing. The flexible graphite packing effectively converts the pressing force of the packing sleeve 12 and the medium force into a sealing structure of the valve stem 5 and can be used in working conditions with large temperature fluctuations (high and low temperatures) to ensure good sealing of the valve.

[0044] Furthermore, as Figure 1 、 Figure 4 shown, one end of the packing sleeve 12 facing the packing gland 13 is a sleeve spherical surface 12.1. The packing gland 13 is provided with a gland spherical surface that cooperates with the sleeve spherical surface 12.1. The gland spherical surface presses against the sleeve spherical surface 12.1. The packing gland 13 and the packing sleeve 12 are in spherical contact, so that the packing sleeve 12 always presses vertically on the packing 11, avoiding the situation that the packing sleeve 12 is driven to tilt and press on the packing 11 due to the tilt of the packing gland 13, thereby improving the sealing effect of the packing 11.

[0045] Furthermore, as Figure 1 、 Figure 4 、 Figure 5 shown, a regular-centered V-type regulating ball valve further includes a valve stem rotation limiting structure. The packing gland 13 is provided with a gland through hole. The valve stem 5 passes through the gland through hole. The valve stem rotation limiting structure includes an arc-shaped groove provided on the inner wall of the gland through hole and a limiting block 16 provided on the valve stem 5. The limiting block extends into the arc-shaped groove. In this way, the rotation angle of the valve stem 5 can be limited by the cooperation of the limiting block and the arc-shaped groove. When the valve is opened and closed, the valve core 2 and the valve seat 3 will stop at the expected positions, thereby preventing the valve from leaking due to excessive opening and closing and ensuring a good sealing effect.

[0046] Furthermore, as Figure 2 、 Figure 3As shown in the figure, a scraper 3.3 is provided on the valve seat 3 and is engaged with the spherical surface of the outer wall of the valve core 2. Under the action of the elastic element 4.3, the scraper 3.3 abuts against the spherical surface of the outer wall of the valve core 2. This design enables the centering V-type regulating ball valve to have a self-cleaning function. During the opening and closing process of the valve, the scraper 3.3 can scrape off media such as particles, fibers, and crystals attached to the sealing surface of the valve core 2, protecting the sealing surface of the valve core 2, so as to ensure that the valve seat 3 and the valve core 2 can be effectively sealed during long-term use.

[0047] In this embodiment, a valve seat sealing surface 3.2 is provided on the valve seat 3 and is engaged with the spherical surface of the outer wall of the valve core 2. The valve seat sealing surface 3.2 is a spherical surface in a circular ring shape. Sharp edges are provided at both the inner and outer edges of the valve seat sealing surface 3.2 in a circular ring shape, and these edges constitute the scraper 3.3. That is, two annular scrapers 3.3 are formed at the valve seat sealing surface 3.2 on the valve seat 3 in this embodiment. In this way, not only can two annular scrapers 3.3 be directly formed at the valve seat sealing surface 3.2, eliminating the need for an additional scraper 3.3 structure, but also during the opening and closing process of the valve, the two annular scrapers 3.3 can scrape off media such as particles, fibers, and crystals attached to the sealing surface of the valve core 2, improving the scraping and cleaning effect; moreover, it can avoid affecting the sealing effect between the valve seat 3 and the valve core 2 due to the design of the scraper 3.3. At the same time, during the use of the valve, when the sealing surface between the valve seat 3 and the valve core 2 wears, the scraper 3.3 will always remain in contact with the surface of the valve core 2 under the action of the elastic element 4.3 to ensure the scraping and cleaning effect of the scraper 3.3, so that the valve is suitable for applications under complex working conditions such as particles and fibers.

[0048] Further, as Figure 2As shown, the valve seat sealing assembly 4 further includes an inner conical end ring 4.5. The inner conical end ring 4.5 is located between the valve seat pressing ring 4.4 and the valve seat 3. One end of the inner conical end ring 4.5 facing the valve seat 3 is an end ring conical surface, and the inner edge of the end ring conical surface inclines towards the valve seat pressing ring 4.4. The valve seat 3 is provided with a valve seat 3 conical surface that cooperates with the end ring conical surface. Under the action of the elastic element 4.3, the inner conical end ring 4.5 makes the end ring conical surface and the valve seat 3 conical surface in sealed connection, and makes the inner conical end ring 4.5 and the inner wall of the inlet in sealed connection. In this embodiment, the inner conical end ring 4.5 is a graphite sealing ring (by utilizing the high-temperature resistance performance of the graphite sealing ring, the inner conical end ring can be adapted to be applied under high and low temperature conditions). Since the inner conical end ring 4.5 makes the end ring conical surface press against the valve seat 3 conical surface under the action of the elastic element 4.3, not only can the end ring conical surface and the valve seat 3 conical surface be in sealed connection, but also under the combined action of the elastic element 4.3 and the conical surface, the inner conical end ring 4.5 will expand and deform outwards, making the inner conical end ring 4.5 and the inner wall of the inlet in sealed connection; at the same time, since the sliding base 4.2 is in sliding and sealing connection between the outer wall of the valve seat sleeve 3.1 and the inner wall of the inlet, this can effectively prevent tiny particle media from entering the space where the elastic element 4.3 is located and accumulating at the position of the elastic element 4.3, which affects the normal operation of the elastic element 4.3 and even causes the failure of the elastic element 4.3.

[0049] Specific Embodiment Three. The rest of the structure of this embodiment refers to Specific Embodiment One or Specific Embodiment Two, and the difference is that As Figure 6 shown, a centering V-type regulating ball valve further includes a cleaning structure. The cleaning structure includes a cleaning channel 17 and a discharge channel.

[0050] The cleaning channel is arranged on the valve seat 3. The annular cavity between the sliding base 4.2 and the valve seat pressing ring 4.4 forms an installation inner cavity 18, and the elastic element 4.3 is located in the installation inner cavity. The cleaning channel communicates the outer wall of the valve seat 3 with the installation inner cavity. One end of the cleaning channel is provided with a detachable sealing plug. Specifically, one end of the cleaning channel communicating with the outer wall of the valve seat 3 is provided with a detachable sealing plug.

[0051] The discharge channel is arranged on the valve seat 3. The cleaning channel and the discharge channel are located on opposite sides of the annular cavity. The discharge channel communicates the outer wall of the valve seat 3 with the installation inner cavity. One end of the discharge channel is provided with a detachable sealing plug. Specifically, one end of the discharge channel communicating with the outer wall of the valve seat 3 is provided with a detachable sealing plug.

[0052] During the long-term use of the current centering V-type regulating ball valve, if particulate medium enters the space where the elastic element 4.3 is located and affects the normal operation of the elastic element 4.3, the valve needs to be disassembled from the pipeline, then the valve is disassembled to clean the space where the elastic element 4.3 is located, and then the valve is assembled and installed back onto the pipeline; this not only involves cumbersome operation steps and low efficiency, but also affects the normal operation of the pipeline. To solve these problems, a cleaning structure is specifically provided in this solution. During the long-term use of the centering V-type regulating ball valve, the space where the elastic element 4.3 is located can be regularly cleaned through the cleaning structure without disassembling the valve and without affecting the normal operation of the pipeline, so as to avoid the accumulation of minute particulate medium at the position of the elastic element 4.3, which may affect the normal operation of the elastic element 4.3 or even cause the elastic element 4.3 to fail. Specifically, the sealing plugs on the cleaning channel and the discharge channel are opened; then, a fluid medium (such as air or water) is injected into the placement cavity through the cleaning channel and then discharged through the discharge channel. During this process, the fluid medium will drive the particulate medium in the placement cavity to be discharged; then, the cleaning channel and the discharge channel are sealed by the sealing plugs; thus, by regularly cleaning the space where the elastic element 4.3 is located, the problem of the accumulation of minute particulate medium at the position of the elastic element 4.3, which may affect the normal operation of the elastic element 4.3 or even cause the elastic element 4.3 to fail, is avoided.

[0053] Further, as Figure 6 shown, the cleaning structure further includes a buffer cavity 21. The buffer cavity is formed in the annular cavity between the valve seat pressing ring 4.4 and the valve seat 3. In this embodiment, an annular seat plate is provided at one end of the valve seat pressing ring 4.4 facing the elastic element 4.3, and the buffer cavity is formed in the annular cavity between the annular seat plate and the valve seat 3. There is a gap between the valve seat pressing ring 4.4 and the valve seat sleeve 3.1. In this embodiment, there is a gap between the annular seat plate and the valve seat sleeve 3.1. This gap constitutes a connection channel 22 connecting the placement cavity and the buffer cavity. A plurality of chip removal grooves 4.6 are provided on one end face of the valve seat pressing ring 4.4 facing the elastic element 4.3. In this embodiment, a plurality of circumferentially uniformly distributed chip removal grooves are provided on one end face of the annular seat plate facing the elastic element 4.3. The chip removal grooves extend radially along the valve seat sleeve 3.1 and communicate the connection channel with the outer wall of the valve seat pressing ring 4.4. An annular groove 19 is provided on the inner wall of the inlet. A plurality of communication holes 20 connecting the annular groove and the buffer cavity are provided on the valve seat pressing ring 4.4. One end of the discharge channel communicates with the outer wall of the valve seat 3, and the other end of the discharge channel communicates with the annular groove. In this embodiment, a plurality of radial grooves 4.7 are provided on one end face of the sliding base 4.2 facing the elastic element 4.3. The radial grooves extend radially along the valve seat sleeve 3.1 and penetrate through the end face of the sliding base 4.2.

[0054] In this embodiment, the elastic element 4.3 is a disc spring (the disc spring has a compact structure and large elasticity). During the process of the fluid medium flowing through the placement inner cavity, in order to prevent particulate media from getting stuck between the disc spring and the valve seat pressing ring 4.4 and the particulate media that fails to be discharged from staying in the placement inner cavity, which may affect the normal operation of the elastic element 4.3; the cleaning structure is further improved in this solution. Specifically, when the cleaning structure works, After the fluid medium (such as air or water) is injected into the placement inner cavity through the cleaning channel, it flows into the buffer cavity through the connecting channel. Then, it flows into the annular groove through the communication hole and is then discharged through the discharge channel. During this process, the particulate media between the disc spring and the valve seat pressing ring 4.4 will flow into the buffer cavity through the chip removal groove and the connecting channel and then be discharged; while the particulate media that fails to be discharged in time will stay in the buffer cavity and / or the annular groove, thus effectively preventing particulate media from getting stuck between the disc spring and the valve seat pressing ring 4.4 and the particulate media that fails to be discharged in time from staying in the placement inner cavity, which may affect the normal operation of the elastic element 4.3.

[0055] The above are only the preferred embodiments of the present invention, and do not impose any limitations on the present invention. Any simple modifications, changes, and equivalent transformations made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A positive center V-type regulating ball valve, characterized in that: The invention comprises a valve body, a valve core and a valve seat, wherein the valve body is provided with an inlet and an outlet; the invention is characterized in that the valve seat sealing assembly is also provided, which comprises: A threaded sleeve is threadedly connected in the inlet of the valve body, a valve seat is slidably arranged in the inlet, a valve seat sleeve is provided on the valve seat and extends toward the threaded sleeve, and an annular cavity is formed between the valve seat sleeve and the inner wall of the inlet; The sliding base, elastic element and valve seat pressure ring are arranged in the annular cavity in sequence. The sliding base is slidingly and sealingly connected with the outer wall of the valve seat sleeve and the inner wall of the inlet. The sliding base is pressed against the threaded sleeve under the action of the elastic element, the valve seat pressure ring is pressed against the valve seat under the action of the elastic element, and the valve seat is pressed against the valve core under the action of the elastic element, so that the valve seat and the valve core are sealed and connected.

2. The V-shaped regulating ball valve according to claim 1 is characterized in that: The valve seat sealing assembly also includes an inner cone end ring, which is located between the valve seat pressure ring and the valve seat. The end of the inner cone end ring facing the valve seat is an end ring cone surface, and the inner edge of the end ring cone surface is inclined toward the valve seat pressure ring. The valve seat is provided with a valve seat cone surface that cooperates with the end ring cone surface. Under the action of the elastic element, the inner cone end ring makes the end ring cone surface and the valve seat cone surface sealed, and the inner cone end ring is sealed to the inner wall of the inlet.

3. The V-shaped regulating ball valve according to claim 1 is characterized in that: The valve seat is provided with a scraper matched with the spherical surface of the outer wall of the valve core. The scraper is pressed against the spherical surface of the outer wall of the valve core under the action of the elastic element.

4. A positive center V-type regulating ball valve according to claim 1, 2 or 3, characterized in that: Also included is a cleanup structure, which includes: A cleaning channel is arranged on the valve seat, the annular cavity between the sliding base and the valve seat pressure ring constitutes an installation cavity, the elastic element is located in the installation cavity, the cleaning channel communicates with the outer wall of the valve seat and the installation cavity, and a detachable sealing plug is arranged at one end of the cleaning channel; The discharge channel is arranged on the valve seat. The cleaning channel and the discharge channel are located on opposite sides of the annular cavity. The discharge channel communicates with the outer wall of the valve seat and the placement inner cavity. A detachable sealing plug is arranged at one end of the discharge channel.

5. The V-shaped regulating ball valve according to claim 4 is characterized in that: The cleaning structure also includes a cache cavity, which is formed in an annular cavity between the valve seat pressure ring and the valve seat. A gap is provided between the valve seat pressure ring and the valve seat sleeve, and the gap constitutes a connecting channel connecting the inner cavity and the cache cavity. A plurality of chip removal grooves are provided on an end surface of the valve seat pressure ring facing the elastic element, and the chip removal grooves extend radially along the valve seat sleeve and connect the connecting channel with the outer wall of the valve seat pressure ring. An annular groove is provided on the inner wall of the inlet, and a plurality of connecting holes connecting the annular groove and the cache cavity are provided on the valve seat pressure ring. One end of the discharge channel is connected to the outer wall of the valve seat, and the other end of the discharge channel is connected to the annular groove.

6. A positive center V-type regulating ball valve according to claim 1, 2 or 3, characterized in that: include: A valve stem, which is rotatably disposed in a valve stem mounting hole of the valve body and is fixedly connected to the valve core; The bottom plug shaft is arranged on the valve body and coaxially distributed with the valve stem. The bottom plug shaft and the valve stem are located on opposite sides of the valve core, and the bottom plug shaft is rotatably connected to the valve core.

7. The V-shaped regulating ball valve according to claim 6 is characterized in that: include: The retaining ring has a groove on the outer wall of the valve stem close to the valve core, and the retaining ring is clamped in the groove; An upper guide sleeve sleeved on the valve stem is located in the valve stem mounting hole; The retaining ring is sleeved on the valve stem and is located between the upper guide sleeve and the retaining ring; The stuffing box is fixed to the valve body by bolts. A valve stem through-hole is arranged on the stuffing box. The valve stem passes through the valve stem through-hole. The valve core and the upper guide sleeve are located on the same side of the stuffing box.

8. A positive center V-type regulating ball valve according to claim 1, 2 or 3, characterized in that: include: A valve stem, which is rotatably disposed in a valve stem mounting hole of the valve body and is fixedly connected to the valve core; A stuffing box is fixed to the valve body by bolts, a sealing ring is arranged between the stuffing box and the valve body, a valve stem through hole is arranged on the stuffing box, the valve stem passes through the valve stem through hole, a stuffing cavity is arranged between the stuffing box and the valve stem, and a sealing stuffing is arranged in the stuffing cavity; The packing pressing plate and the packing pressing sleeve, the valve body passes through the packing pressing sleeve and the packing pressing plate in sequence, the packing pressing sleeve is located between the packing pressing plate and the sealing packing, the packing pressing sleeve is connected to the valve body or the stuffing box by bolts, and the packing pressing sleeve is pressed tightly on the sealing packing.

9. The V-shaped regulating ball valve according to claim 8 is characterized in that: One end of the packing pressing sleeve facing the packing pressing plate is a pressing sleeve spherical surface, and the packing pressing plate is provided with a pressing plate spherical surface matched with the pressing sleeve spherical surface, and the pressing plate spherical surface presses against the pressing sleeve spherical surface.

10. A positive center V-shaped regulating ball valve according to claim 1, 2 or 3, characterized in that: include: A valve stem, which is rotatably disposed in a valve stem mounting hole of the valve body and is fixedly connected to the valve core; Rotate the actuator, set it on the valve body, and drive the valve stem to rotate.

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