CN115405718A - Track ball valve convenient to change filler - Google Patents

Abstract

The invention discloses an orbital ball valve for easy replacement of packing, which comprises a valve body, a valve cover, a ball and a valve stem. A sealing mechanism is installed on the valve cover, the inner end of the valve stem is linked with the ball, the actuator is installed above the valve cover, the output end of the actuator is linked with the outer end of the valve stem, and the valve seat is also installed in the valve body; sealing The mechanism includes packing gland, sealing packing, upper gasket, lower gasket, force ring and prying assembly. There is a sealing cavity on the valve cover, and the upper gasket, sealing packing, lower gasket, and force ring are arranged on the sealing surface. In the cavity, the packing gland is connected with the valve cover through the swing bolt, and the packing gland presses the upper gasket, sealing packing, lower gasket, and force ring in the sealing chamber, and the components are pried off and installed on the valve stem. and cooperate with the force ring. The invention facilitates the operation of replacing the filler during later maintenance, and has the advantages of saving time and effort.

Description

Orbital ball valve for easy packing replacement

technical field

The invention relates to the technical field of valves, in particular to an orbital ball valve which is convenient for packing replacement.

Background technique

Orbital ball valve is a ball valve with a special structure, because the orbital ball valve can realize the rotary opening and closing of the valve core, the switch has no friction, and can realize forced sealing. In the field of chemical industry, it is more and more widely used, especially in the conditions of fast cut-off and high and low temperature alternating conditions, such as: natural gas molecular sieve dehydration unit, hydrogenation unit, natural gas metering station, large-scale ethylene plant low-temperature cold box import and export. Alternating temperature track ball valve and molecular sieve track ball valve, etc.

The working principle of the existing orbital ball valve is: the valve stem moves up or down under the action of the hand wheel, the guide groove on the valve stem contacts the guide pin, and after the valve stem moves in a straight line, it performs a 90-degree rotary motion. When moving in a straight line, the wedge-shaped surface at the lower end of the valve stem pushes the ball close to the valve seat to achieve sealing, or breaks away from the valve seat to open the valve; then, under the action of the guide groove and guide pin, the valve stem drives the ball to rotate 90°. The opening and closing process of the valve is realized by the rising and falling movement of the valve stem. After the existing orbital ball valve is used for a long time, it is necessary to replace and maintain the packing between the valve stem and the valve cover to ensure a good seal between the two. However, in the process of disassembling the ball valve, the packing and valve The adhesion of the inner wall of the cover sealing chamber makes it difficult to remove the packing, which brings great trouble to the operation of packing replacement.

Contents of the invention

The object of the present invention is to provide an orbital ball valve that facilitates the replacement of packing. The present invention facilitates the replacement of packing during later maintenance and has the advantages of saving time and effort.

In order to achieve the above object, the present invention provides the following technical solutions: an orbital ball valve for easy replacement of packing, including a valve body, a valve cover, a ball and a valve stem, the ball is arranged in the inner cavity of the valve body, and the valve cover is installed on the upper end of the valve body , the valve stem is set through the valve cover, and the valve cover is installed with a sealing mechanism for forming a sealing fit with the valve stem, the inner end of the valve stem is linked with the ball, and the upper part of the valve cover is installed with an actuator The actuator, the output end of the actuator is linked with the outer end of the valve stem, and a valve seat is installed in the valve body; the sealing mechanism includes a packing gland, a sealing packing, an upper gasket, a lower gasket, a force bearing Ring and pry open components, the valve cover is provided with a sealing cavity coaxial with the valve stem, the upper gasket, sealing packing, lower gasket, and force ring are sequentially arranged in the sealing cavity from the outside to the inside. The packing gland is connected with the bonnet through the joint bolt, and the packing gland presses the upper gasket, sealing packing, lower gasket and stress ring in the sealing cavity, and the prying assembly is installed on the valve stem. and cooperate with the force ring to apply axial force to the force ring when replacing the sealing packing.

By adopting the above technical scheme, when it is necessary to replace the sealing packing, it is only necessary to loosen the packing gland first, and then apply an upward axial force to the force ring by operating the pry open assembly, and then the force ring and the force ring can be set on the force ring. The upper gasket, sealing packing, and lower gasket above the force ring are pried up, and finally the valve stem is driven up by the actuator. It is very convenient to replace the packing, and it has the advantages of saving time and labor.

The present invention further provides that the prying assembly includes a pry block, a first spring, an upper slider, a plurality of middle sliders, a lower slider, a sliding sleeve, a connecting column, a support rod, a second spring, and a trigger screw sleeve, A pair of axially extending sliding chambers are symmetrically arranged on the valve stem, and an upper mounting hole communicating with the upper part of the sliding chamber and a lower mounting hole communicating with the lower part of the sliding chamber are provided on the side of the valve stem. hole, the skid block is slidably arranged in the lower mounting hole, and the outer circumference of the skid block is axially installed with at least two first sealing rings for forming a sealing fit with the inner wall of the lower mounting hole, and the valve stem corresponds to the lower mounting hole The position of the outer end is provided with a lower installation groove, and a limit block is installed on the lower installation groove by screws. A guide passage extending toward the sealing chamber, the skid is provided with a guide part matched with the guide passage, and the outer end of the guide part is provided with a first slope for tilting the force ring, the The force ring is provided with a first guide slope and a second guide slope matched with the first slope in the direction away from the first slope, and the slope of the first slope is smaller than the slope of the first guide slope and greater than the slope of the second guide The inclination of the slope, the skid block and the limit block are respectively provided with a first positioning groove and a second positioning groove, and the two ends of the first spring are respectively embedded in the first positioning groove and the second positioning groove, The upper slider, multiple middle sliders, and lower sliders are sequentially arranged in the sliding chamber from top to bottom, and the upper slider, multiple middle sliders, and lower sliders are all hollow structures to reduce weight. The inner end of the skid block is provided with a second slope, and the lower slider is provided with a third slope matched with the second slope, the upper slider, a plurality of middle sliders and the lower slider The same height, the height of the upper mounting hole is not less than the height of the upper slider, the sliding sleeve is set on the outer periphery of the valve stem, the inner side of the sliding sleeve is provided with a first circular groove, and the side of the upper slider is provided with a second Two circular grooves, the two ends of the connecting column are respectively embedded in the first circular groove and the second circular groove, and the two ends of the connecting column are respectively interference fit with the first circular groove and the second circular groove, and the upper The bottom of the inner wall of the mounting hole is provided with a spring groove, the second spring is arranged in the spring groove, the lower part of the support rod is slidably arranged in the spring groove and the lower end of the support rod is against the upper end of the second spring, the upper end of the support rod The upper end is provided with an arc-shaped support portion for supporting the connecting column, and the trigger screw sleeve is threadedly connected to a position above the corresponding sliding sleeve on the valve stem for pushing the sliding sleeve to slide axially.

By adopting the above technical scheme, when the sealing packing needs to be replaced, the packing gland should be loosened first, and then the trigger screw sleeve should be rotated, so that the trigger screw sleeve is pressed on the sliding sleeve and the sliding sleeve is driven downward, and the sliding sleeve drives the upward slide block, a plurality of middle sliders and lower sliders go down, and the lower slider cooperates with the skid block during the downward movement to make the skid block move outward. The first slope on the guide part of the skid block and the first guide slope on the force ring With the cooperation of the second guide slope, the force ring is gradually tilted up, and the force ring drives the upper gasket, sealing packing, and lower gasket upward, and cooperates with the actuator to drive the valve stem upward, so that the effect of pushing the sealing packing out of the sealing cavity can be realized. Even if the sealing packing sticks to the inner wall of the sealing cavity, the sealing packing can be effectively pried apart, which facilitates the replacement operation of the sealing packing.

The present invention is further provided that the lower end of the trigger screw sleeve is provided with multiple sets of rolling contact pieces, the rolling contact pieces include a screw, a limit screw sleeve and a ball, and the middle part of the screw rod is integrally provided with a hexagonal operating part. The lower end of the trigger screw sleeve is provided with a connecting screw hole for the upper end of the screw to be screwed in, the lower end of the screw is provided with a rolling groove, and the ball is arranged in the rolling groove, and the depth of the rolling groove is smaller than that of the ball diameter and greater than the radius of the ball, the limit screw sleeve is threadedly connected to the lower part of the screw rod, and the lower end of the limit screw sleeve is provided with a limit flange extending to the inner circumference, and the limit flange is pressed against the lower part of the ball to Balls are confined within rolling grooves.

By adopting the above technical solution, the trigger screw sleeve applies a downward force to the sliding sleeve in the form of rolling contact, which can reduce the contact friction between the two, not only makes the operation easier, but also improves the service life of the parts .

In the present invention, it is further provided that the sliding sleeve includes symmetrically arranged left half rings and right half rings, and the left half rings and right half rings are connected together by screws.

By adopting the above technical scheme, the disassembly and assembly operation of the sliding sleeve is greatly facilitated.

The present invention is further provided that the sealing packing includes a first half-ring and a second half-ring, and a V-shaped recess is respectively provided on the two end faces of the first half-ring attached to the second half-ring, and the second half-ring A V-shaped convex part matched with a corresponding V-shaped concave part is respectively provided on the two end faces of the first half ring.

By adopting the above technical solution, not only the sealing effect is good under pressure, but also the disassembly and assembly are convenient, and the sealing packing can be replaced without separating the valve stem and the valve cover, which greatly reduces the difficulty and workload of sealing packing replacement.

The present invention is further provided that a threaded groove is provided on the inner wall of the valve body, the valve seat is threadedly connected to the threaded groove, and an inner sealing ring for forming a sealing fit with the sphere is installed on the valve seat. There is also a chute on the inner wall along the circumferential direction, the outer periphery of the valve seat is provided with a pressing flange matching the chute, and an outer seal is interposed between the outer periphery of the valve seat and the inner wall of the valve. ring, the inner end of the outer sealing ring is against the outer end face of the pressing flange, and the outer end of the outer sealing ring is against the end face of the chute.

By adopting the above technical scheme, the valve seat is installed in the valve body through threaded connection, which is very convenient to disassemble and facilitate the early assembly and later maintenance operations to ensure the normal use of the ball valve. At the same time, the pressing flange of the valve seat will The outer sealing ring is pressed against the inner end of the chute on the inner wall of the valve. The tighter the valve seat is screwed, the greater the deformation of the outer sealing ring toward the inner and outer circumferences, thus realizing the gap between the seat and the inner wall of the valve. Effective sealing between to prevent leakage.

The present invention is further provided that, the valve seat is provided with an annular installation groove along the circumference, and the inner sealing ring is partially embedded in the annular installation groove.

By adopting the above technical solution, the replaceable operation of the inner sealing ring is realized, and the maintenance cost is saved.

In the present invention, it is further provided that the inner end and the outer end of the outer sealing ring are tapered with gradually decreasing width.

By adopting the above technical scheme, the contact area between the inner circumference of the outer sealing ring and the outer circumference of the valve seat and the cross-sectional area between the outer circumference of the outer sealing ring and the inner wall of the valve body are reduced, thereby improving the pressure on the outer circumference of the valve seat when the outer sealing ring deforms under pressure. And the extrusion stress of the inner wall of the valve, thereby further improving the sealing performance between the outer periphery of the valve seat and the inner wall of the valve.

The present invention is further provided that a gasket is interposed between the pressing flange and the outer sealing ring.

By adopting the above technical solution, the gasket can protect the outer sealing ring and the valve seat.

The present invention is further provided that a support ring is installed on the inner wall of the valve through a locking screw, and a seal groove is arranged on the end surface of the support ring that fits the inner wall of the valve along the circumferential direction, and a seal groove is embedded in the seal groove. There is an O-ring used to form a sealing fit with the inner wall of the valve, and the threaded groove and the sliding groove are both set on the supporting ring.

By adopting the above technical scheme, the support ring can be replaced, avoiding the problem that the thread groove is directly opened on the inner wall of the valve, which will cause the thread damage and difficult to maintain later, that is, when the thread is damaged, only the support ring needs to be replaced, which facilitates the maintenance operation and greatly Reduced maintenance costs.

The present invention is further provided that a positioning groove is provided on the inner wall of the valve along the circumferential direction, and a positioning flange matching the positioning groove is provided on the support ring.

By adopting the above technical solution, the support ring can be positioned before the support ring is installed, which facilitates the installation operation of the support ring.

The present invention is further provided that the support ring is coaxially provided with a large circular groove and a small circular hole from the inside to the outside, and a small screw hole corresponding to the small circular hole is opened on the inner wall of the valve, and the lock The screw part of the tightening screw passes through the small circular hole and is screwed into the small screw hole, and the screw head of the locking screw is embedded in the large circular groove and abuts against the inner end surface of the large circular groove.

By adopting the above technical solution, the connection between the support ring and the valve body can be realized, and the connection structure is simple and reliable, and the assembly and disassembly are convenient, which is beneficial to the assembly in the early stage and the maintenance operation in the later stage.

Description of drawings

Fig. 1 is the overall structural representation of the present invention;

Fig. 2 is the structural representation of sealing mechanism of the present invention;

Fig. 3 is a schematic diagram of an enlarged structure of part A in Fig. 2;

Fig. 4 is the schematic diagram of the enlarged structure of part B in Fig. 2;

Fig. 5 is a schematic diagram of an enlarged structure of part C in Fig. 2;

Fig. 6 is a structural schematic diagram of a sliding sleeve of the present invention;

Fig. 7 is a structural schematic diagram of the trigger screw sleeve of the present invention;

FIG. 8 is a schematic diagram of an enlarged structure of part D in FIG. 1 .

In the figure: 1. Valve body; 2. Bonnet; 3. Ball; 4. Valve stem; 5. Actuator; 6. Valve seat; 7. Thread groove; 8. Inner sealing ring; 9. Slide groove; 10. Compression flange; 11. Outer sealing ring; 12. Annular mounting groove; 13. Washer; 14. Locking screw; 15. Support ring; 16. Sealing groove; 17. O-ring; 18. Positioning groove; 19 , positioning flange; 20, large round groove; 21, small round hole; 22, small screw hole; 23, sealing mechanism; 24, packing gland; 25, sealing packing; 26, upper gasket; 27, lower gasket; 28. Stress ring; 29. Pry open assembly; 30. Seal chamber; 31. Skid block; 32. First spring; 33. Upper slider; 34. Middle slider; 35. Lower slider; 36. Sliding sleeve 37, connecting column; 38, support rod; 39, second spring; 40, trigger screw sleeve; 41, sliding chamber; 42, upper mounting hole; 43, lower mounting hole; 44, first sealing ring; 45, lower Installation groove; 46, limit block; 47, guide channel; 48, guide part; 49, first slope; 50, first guide slope; 51, second guide slope; 52, first positioning groove; 53, second Positioning groove; 54, second slope; 55, third slope; 56, first circular groove; 57, second circular groove; 58, spring groove; 59, arc support portion; 60, rolling contact piece; 61, screw 62, limit screw sleeve; 63, ball; 64, hexagonal operating part; 65, connecting screw hole; 66, rolling groove; 67, limit flange; 68, left half ring; 69, right half ring; 70. The first half ring; 71. The second half ring; 72. The V-shaped concave part; 73. The V-shaped convex part.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Embodiment: As shown in the accompanying drawings 1 to 8, the track ball valve for easy replacement of packing includes a valve body 1, a valve cover 2, a ball 3 and a valve stem 4, the ball 3 is arranged in the inner cavity of the valve body 1, and the The valve cover 2 is installed on the upper end of the valve body 1, the valve stem 4 is installed through the valve cover 2, and the valve cover 2 is equipped with a sealing mechanism 23 for forming a sealing fit with the valve stem 4, and the inside of the valve stem 4 end is linked with the sphere 3, an actuator 5 is installed above the valve cover 2, the actuator 5 is a pneumatic actuator, and the pneumatic actuator is an existing mature device, so its specific structure will not be described in detail here. The output end of the actuator 5 is linked with the outer end of the valve stem 4, and the valve seat 6 is also installed in the valve body 1; the sealing mechanism 23 includes a packing gland 24, a sealing packing 25, an upper gasket 26, a lower Gasket 27, force ring 28 and pry open assembly 29, the valve cover 2 is provided with a sealing cavity 30 coaxial to the valve stem 4, the upper gasket 26, sealing packing 25, lower gasket 27, receiving The force ring 28 is arranged in the sealing cavity 30 from the outside to the inside in turn, and the packing gland 24 is connected with the valve cover 2 through the swing bolt, and the packing gland 24 connects the upper gasket 26, the sealing packing 25, the lower gasket The sheet 27 and the force ring 28 are pressed tightly in the sealing cavity 30, and the prying assembly 29 is installed on the valve stem 4 and cooperates with the force ring 28, and is used to apply a shaft to the force ring 28 when the sealing packing 25 is replaced. Xiangli. When it is necessary to replace the sealing packing 25, you only need to loosen the packing gland 24 first, and then apply an upward axial force to the force ring 28 by operating the pry open assembly 29, so that the force ring 28 and the force ring 28 can be set on the force ring 28. The upper gasket 26, sealing packing 25, and lower gasket 27 above the ring 28 are pried up, and finally the valve stem 4 is driven up by the actuator 5, and the sealing packing 25 is taken out of the sealing chamber 30 under the action of the prying assembly 29, and then The sealing packing 25 can be taken out for replacement by removing the valve cover 2, which is very convenient to operate and has the advantages of saving time and effort.

As shown in accompanying drawings 2 to 4, the prying assembly 29 includes a pry block 31, a first spring 32, an upper slider 33, a plurality of middle sliders 34, a lower slider 35, a sliding sleeve 36, a connecting column 37, Support rod 38, second spring 39 and trigger screw sleeve 40, a pair of sliding chambers 41 extending in the axial direction are symmetrically arranged on the valve stem 4, and the side of the valve stem 4 is provided with the upper part of the sliding chamber 41 The upper mounting hole 42 communicated with the lower mounting hole 43 communicated with the lower part of the sliding chamber 41, the skid block 31 is slidably arranged in the lower mounting hole 43, and the outer circumference of the skid block 31 is axially installed with at least two The first sealing ring 44 that is used to form a sealing fit with the inner wall of the lower mounting hole 43, the outer periphery of the main body of the skid block 31 is cylindrical, and the valve stem 4 is provided with a lower mounting groove 45 at the position corresponding to the outer end of the lower mounting hole 43. A limit block 46 is installed on the lower mounting groove 45 by screws, the lower end of the limit block 46 extends into the lower mounting hole 43, and the lower end of the limit block 46 and the lower part of the inner wall of the lower mounting hole 43 form a direction toward the sealed cavity 30. Extended guide channel 47, the skid block 31 is provided with a guide part 48 matched with the guide channel 47, the bottom surface of the guide part 48 is a circular arc surface, the top surface of the guide part 48 is a plane, the guide part 47 The cross-sectional shape is the same as the cross-sectional shape of the guide part 48, and the outer end of the guide part 48 is provided with a first slope 49 for lifting the force receiving ring 28, and the force receiving ring 28 is provided in a direction away from the first slope 49. There is a first guide slope 50 and a second guide slope 51 matched with the first slope 49, the slope of the first slope 49 is smaller than the slope of the first guide slope 50 and greater than the slope of the second guide slope 51, The skid block 31 and the limiting block 46 are respectively provided with a first positioning groove 52 and a second positioning groove 53, and the two ends of the first spring 32 are embedded in the first positioning groove 52 and the second positioning groove 53 respectively. Among them, the upper slider 33, multiple middle sliders 34, and lower sliders 35 are sequentially arranged in the sliding cavity 41 from top to bottom, and the cross-sectional shapes of the upper slider 33, the middle slider 34, and the lower slider 35 The same as the cross-sectional shape of the sliding chamber 41, the inner end of the skid block 31 is provided with a second slope 54, and the lower slider 35 is provided with a third slope 55 matching the second slope 54, so The heights of the upper slider 33 , the plurality of middle sliders 34 and the lower slider 35 are the same, the height of the upper mounting hole 42 is not less than the height of the upper slider 33 , and the sliding sleeve 36 is sleeved on the outer periphery of the valve stem 4 , the sliding table can slide axially along the valve stem 4, the inner side of the sliding sleeve 36 is provided with a first circular groove 56, the side of the upper slider 33 is provided with a second circular groove 57, the two connecting columns 37 The ends are respectively embedded in the first circular groove 56 and the second circular groove 57, and the two ends of the connecting column 37 are respectively interference fit with the first circular groove 56 and the second circular groove 57, and the inner wall of the upper mounting hole 42 The bottom is provided with a spring groove 58, the second spring 39 is arranged in the spring groove 58, the lower part of the support rod 38 is slidingly arranged in the spring groove 58 and the lower end of the support rod 38 is against the upper end of the second spring 39, the Support rod 38 The upper end of the upper end is provided with an arc-shaped support portion 59 for supporting the connecting column 37, and the trigger screw sleeve 40 is threadedly connected to the position above the corresponding sliding sleeve 36 on the valve stem 4 to push the sliding sleeve 36 to slide axially, that is, the trigger screw sleeve 40 The inner wall of the sleeve 40 has an internal thread, and the outer wall of the valve stem 4 has an external thread matched with the internal thread. When it is necessary to replace the sealing packing 25, first loosen the packing gland 24, and then rotate the trigger screw sleeve 40, so that the trigger screw sleeve 40 is pressed on the sliding sleeve 36 and the sliding sleeve 36 is urged to move downward, and the sliding sleeve 36 drives the upper Slider 33, a plurality of middle sliders 34 and lower slider 35 go down. During the downward movement of lower slider 35, the skid 31 cooperates with the skid 31 to move outward. The first inclined surface 49 on the guide part 48 of the skid 31 Cooperate with the first guide inclined surface 50 and the second guide inclined surface 51 on the stress ring 28, gradually lift the stress ring 28, and the stress ring 28 drives the upper gasket 26, the sealing packing 25, and the lower gasket 27 to go upward, and cooperate to execute The device 5 drives the valve stem 4 upward, and the effect of pushing the sealing packing 25 out of the sealing cavity 30 can be realized. Even if the sealing packing 25 is adhered to the inner wall of the sealing cavity 30, the sealing packing 25 can be effectively pried apart, so that the replacement of the sealing packing 25 is convenient. operate.

As shown in Figure 5, the lower end of the trigger screw 40 is provided with a plurality of sets of rolling contacts 60, the rolling contact 60 includes a screw 61, a limit screw 62 and a ball 63, and the middle part of the screw 61 is integrated. There is a hexagonal operating part 64, the lower end of the trigger screw sleeve 40 is provided with a connecting screw hole 65 for the upper end of the screw 61 to be screwed in, the lower end of the screw 61 is provided with a rolling groove 66, and the ball 63 is set In the rolling groove 66, and the depth of the rolling groove 66 is smaller than the diameter of the ball 63 and greater than the radius of the ball 63, the limit screw sleeve 62 is screwed to the bottom of the screw rod 61, and the lower end of the limit screw sleeve 62 is provided There is a limit flange 67 extending to the inner periphery, the limit flange 67 abuts against the lower part of the ball 63 to limit the ball 63 in the rolling groove 66, and the lower end of the ball 63 extends to the outside for contact with the upper end surface of the sliding sleeve 36 . The trigger screw sleeve 40 exerts a downward force on the sliding sleeve 36 in a rolling contact manner, which can reduce the contact friction between the two, not only makes the operation easier, but also improves the service life of the parts.

As shown in FIG. 6 , the sliding sleeve 36 includes symmetrically arranged left half rings 68 and right half rings 69 , and the left half rings 68 and right half rings 69 are connected together by screws. This design greatly facilitates the dismounting operation of the sliding sleeve 36 .

As shown in Figure 7, the sealing packing 25 includes a first half-ring 70 and a second half-ring 71, and the two end faces of the first half-ring 70 and the second half-ring 71 are respectively provided with a V-shaped recess 72 The two end surfaces of the second half-ring 71 adhering to the first half-ring 70 are respectively provided with a V-shaped convex portion 73 matched with the corresponding V-shaped concave portion 72 . The structure of the sealing packing 25 not only has a good sealing effect under pressure, but also is easy to disassemble. The replacement of the sealing packing 25 can be realized without separating the valve stem 4 and the valve cover 2, which greatly reduces the difficulty and work of replacing the sealing packing 25. quantity.

As shown in Figure 8, the inner wall of the valve body 1 is provided with a threaded groove 7, the valve seat 6 is threadedly connected to the threaded groove 7, and the valve seat 6 is installed with a seal for sealing with the ball 3. Inner sealing ring 8, the inner wall of the valve body 1 is also provided with a chute 9 along the circumference, the chute 9 is coaxially arranged with the thread groove 7, the diameter of the chute 9 is greater than the diameter of the thread groove 7, and the valve seat The outer periphery of the valve seat 6 is provided with a pressing flange 10 matched with the chute 9, the pressing flange 10 is integrated with the valve seat 6, and the outer circumference of the valve seat 6 and the inner wall of the valve body 1 are provided with An outer sealing ring 11 , the inner end of the outer sealing ring 11 abuts against the outer end surface of the pressing flange 10 , and the outer end of the outer sealing ring 11 abuts against the end surface of the chute 9 . The valve seat 6 is installed in the valve body 1 through threaded connection, which is very convenient for disassembly and assembly, which is beneficial to the early assembly and later maintenance operations, so as to ensure the normal use of the ball valve. At the same time, the pressing flange 10 of the valve seat 6 will The sealing ring 11 is pressed against the inner end of the chute 9 on the inner wall of the valve body 1, and the tighter the valve seat 6 is screwed, the greater the deformation of the outer sealing ring 11 toward the inner and outer circumferences, thereby realizing the valve seat 6 Effective sealing with the inner wall of the valve body 1 prevents leakage.

As shown in FIG. 8 , the valve seat 6 is provided with an annular installation groove 12 along the circumference, and the inner sealing ring 8 is partially embedded in the annular installation groove 12 , and the two are in an interference fit. This design realizes the replaceable operation of the inner sealing ring 8 and saves the maintenance cost.

As shown in FIG. 8 , the inner end and the outer end of the outer sealing ring 11 are tapered with gradually decreasing width. This design reduces the contact area between the inner circumference of the outer sealing ring 11 and the outer circumference of the valve seat 6 and the cross-sectional area between the outer circumference of the outer sealing ring 11 and the inner wall of the valve body 1, thereby improving the pressure on the valve seat when the outer sealing ring 11 is deformed under pressure. 6 and the extrusion stress on the inner wall of the valve body 1, thereby further improving the sealing performance between the outer periphery of the valve seat 6 and the inner wall of the valve body 1.

As shown in FIG. 8 , a gasket 13 is interposed between the pressing flange 10 and the outer sealing ring 11 , and the gasket 13 is made of metal. The gasket 13 can protect the outer sealing ring 11 and the valve seat 6 .

As shown in Figure 8, a support ring 15 is installed on the inner wall of the valve body 1 through a locking screw 14, and a seal groove 16 is provided along the circumference on the end surface of the support ring 15 that fits the inner wall of the valve body 1. , the sealing groove 16 is embedded with an O-ring 17 for forming a sealing fit with the inner wall of the valve body 1, the O-ring 17 is in interference fit with the sealing groove 16, and the threaded groove 7 and the chute 9 are set on the support Circle 15 on. The support ring 15 can be replaced, avoiding the problem that the thread groove 7 is directly opened on the inner wall of the valve body 1, which will cause the thread damage in the later stage and is difficult to maintain. maintenance costs.

As shown in FIG. 8 , a positioning groove 18 is provided on the inner wall of the valve body 1 along the circumference, and a positioning flange 19 matching the positioning groove 18 is provided on the support ring 15 . This design can position the support ring 15 before the support ring 15 is installed, which facilitates the installation operation of the support ring 15 .

As shown in Figure 8, the support ring 15 is coaxially provided with a large circular groove 20 and a small circular hole 21 from the inside to the outside, and a small circular hole 21 corresponding to the small circular hole 21 is provided on the inner wall of the valve body 1. screw hole 22, the screw part of the locking screw 14 passes through the small circular hole 21 and is screwed into the small screw hole 22, the screw head of the locking screw 14 is embedded in the large circular groove 20 and is connected with the large circular groove The inner end surfaces of the groove 20 are butted against each other. This design can realize the connection between the support ring 15 and the valve body 1, and the connection structure is simple and reliable, and the disassembly and assembly are convenient, which is beneficial to the assembly in the early stage and the maintenance operation in the later stage.

Claims (10)

1. An orbital ball valve for easy replacement of packing, including a valve body (1), a valve cover (2), a ball (3) and a valve stem (4), the ball (3) is arranged in the inner cavity of the valve body (1), The valve cover (2) is installed on the upper end of the valve body (1), the valve stem (4) is arranged through the valve cover (2), and the valve cover (2) is installed with a valve stem (4) ) to form a sealing mechanism (23) for sealing fit, the inner end of the valve stem (4) is linked with the sphere (3), and an actuator (5) is installed above the valve cover (2), and the actuator (5) ) is linked with the outer end of the valve stem (4), and a valve seat (6) is also installed in the valve body (1); it is characterized in that: the sealing mechanism (23) includes a packing gland (24 ), sealing packing (25), upper gasket (26), lower gasket (27), force ring (28) and prying assembly (29), the bonnet (2) is provided with a valve coaxial The sealing cavity (30) of the rod (4), the upper gasket (26), the sealing packing (25), the lower gasket (27), and the force ring (28) are sequentially arranged in the sealing cavity (30) from outside to inside. ), the packing gland (24) is connected with the bonnet (2) by swing bolts, and the packing gland (24) connects the upper gasket (26), sealing packing (25), lower gasket ( 27), the force ring (28) is compressed in the sealing chamber (30), and the prying assembly (29) is installed on the valve stem (4) and cooperates with the force ring (28), and is used for replacing the seal Axial force is applied to the force ring (28) during packing (25). 2. The track ball valve for easy replacement of packing according to claim 1, characterized in that: the prying assembly (29) includes a prying block (31), a first spring (32), an upper slider (33), multiple Among them, slide block (34), lower block (35), sliding sleeve (36), connecting column (37), support rod (38), second spring (39) and trigger screw sleeve (40), the valve A pair of axially extending sliding chambers (41) are symmetrically arranged on the rod (4), and an upper mounting hole (42) communicating with the upper part of the sliding chamber (41) is provided on the side of the valve rod (4) And the lower installation hole (43) communicated with the bottom of the sliding chamber (41), the skid (31) is slidably arranged in the lower installation hole (43), and the outer circumference of the skid (31) is axially installed with At least two first sealing rings (44) are used to form a sealing fit with the inner wall of the lower mounting hole (43), and the valve stem (4) is provided with a lower mounting groove (45) at the position corresponding to the outer end of the lower mounting hole (43) , the limit block (46) is installed by screws on the lower mounting groove (45), the lower end of the limit block (46) extends into the lower mounting hole (43), and the lower end of the limit block (46) is in line with the The lower part of the inner wall of the lower installation hole (43) forms a guide channel (47) extending toward the sealing chamber (30), and the skid (31) is provided with a guide part (48) that matches the guide channel (47). ), the outer end of the guide portion (48) is provided with a first slope (49) for lifting the force ring (28), and the force ring (28) is in a direction away from the first slope (49) A first guide slope (50) and a second guide slope (51) matched with the first slope (49) are provided, the slope of the first slope (49) is smaller than the slope of the first guide slope (50) And greater than the inclination of the second guiding slope (51), the skid (31) and the limit block (46) are respectively provided with a first positioning groove (52) and a second positioning groove (53), the first The two ends of a spring (32) are respectively embedded in the first positioning groove (52) and the second positioning groove (53), and the upper slider (33), a plurality of middle sliders (34), the lower slider (35) are arranged in the sliding cavity (41) from top to bottom in turn, the inner end of the skid block (31) is provided with a second slope (54), and the lower slider (35) is provided with the The third inclined surface (55) that the second inclined surface (54) matches, the heights of the upper slider (33), a plurality of middle sliders (34) and the lower slider (35) are the same, and the upper mounting hole ( The height of 42) is not less than the height of the upper slider (33), the sliding sleeve (36) is sleeved on the outer circumference of the valve stem (4), and the inner side of the sliding sleeve (36) is provided with a first round groove (56), so The side of the upper slider (33) is provided with a second circular groove (57), and the two ends of the connecting column (37) are respectively embedded in the first circular groove (56) and the second circular groove (57). , and the two ends of the connecting column (37) are interference fit with the first circular groove (56) and the second circular groove (57) respectively, and the bottom of the inner wall of the upper mounting hole (42) is provided with a spring groove (58), the second spring (39) is arranged in the spring groove (58), the lower part of the support rod (38) is slidably arranged in the spring groove (58) and the lower end of the support rod (38) is against the second spring groove (58). The upper end of two springs (39), the upper end of the support rod (38) is provided with an arc-shaped support portion (59) for supporting the connecting column (37), and the trigger screw sleeve (40) is threadedly connected to the valve rod (4 ) corresponding to the position above the sliding sleeve (36) is used to push the sliding sleeve (36) to slide axially. 3. The track ball valve for easy replacement of packing according to claim 2, characterized in that: the lower end of the trigger screw sleeve (40) is provided with multiple sets of rolling contact pieces (60), and the rolling contact pieces (60) include Screw rod (61), limit screw sleeve (62) and ball (63), described screw rod (61) middle part is integrally provided with hexagonal operating part (64), the lower end of described trigger screw sleeve (40) is provided with for The upper end of the screw (61) is screwed into the connecting screw hole (65), the lower end of the screw (61) is provided with a rolling groove (66), and the ball (63) is arranged in the rolling groove (66), and The depth of the rolling groove (66) is less than the diameter of the ball (63) and greater than the radius of the ball (63), the limit screw sleeve (62) is threadedly connected to the lower part of the screw rod (61), and the limit screw sleeve The lower end of (62) is provided with a limiting flange (67) extending to the inner periphery, and the limiting flange (67) abuts against the lower part of the ball (63) to limit the ball (63) in the rolling groove (66). 4. The orbital ball valve for easy replacement of packing according to claim 2, characterized in that: the sliding sleeve (36) includes symmetrically arranged left half rings (68) and right half rings (69), and the left half rings (68 ) and the right half ring (69) are connected together by screws. 5. The track ball valve for easy replacement of packing according to claim 2, characterized in that: the sealing packing (25) includes a first half ring (70) and a second half ring (71), the first half ring (70 ) are respectively provided with a V-shaped recess (72) on the two end faces of the second half-ring (71), and the two end faces of the second half-ring (71) are respectively attached to the first half-ring (70). A V-shaped convex portion (73) is provided to cooperate with the corresponding V-shaped concave portion (72). 6. The track ball valve for easy replacement of packing according to claim 1, characterized in that: the inner wall of the valve body (1) is provided with a threaded groove (7), and the valve seat (6) is threadedly connected to the threaded groove (7), the valve seat (6) is equipped with an inner sealing ring (8) for forming a sealing fit with the ball (3), and the inner wall of the valve body (1) is also provided with a chute in the circumferential direction. (9), the outer periphery of the valve seat (6) is provided with a pressing flange (10) matched with the chute (9), and the outer periphery of the valve seat (6) and the inner wall of the valve body (1) An outer sealing ring (11) is sandwiched between, and the inner end of the outer sealing ring (11) is against the outer end surface of the pressing flange (10), and the outer end of the outer sealing ring (11) is in contact with the chute ( 9) against each other; the valve seat (6) is provided with an annular installation groove (12) along the circumference, and the inner sealing ring (8) is partially embedded in the annular installation groove (12). 7. The orbital ball valve for easy packing replacement according to claim 1, characterized in that: the inner end and the outer end of the outer sealing ring (11) are tapered with gradually decreasing width. 8. The orbital ball valve for easy packing replacement according to claim 1, characterized in that a gasket (13) is sandwiched between the pressing flange (10) and the outer sealing ring (11). 9. The track ball valve for easy replacement of packing according to claim 1, characterized in that: a support ring (15) is installed on the inner wall of the valve body (1) through locking screws (14), and the support ring (15) ) is provided with a sealing groove (16) along the circumferential direction on one end surface that fits with the inner wall of the valve body (1), and an O Shaped ring (17), the threaded groove (7) and the chute (9) are all opened on the support ring (15); the inner wall of the valve body (1) is provided with a positioning groove (18) along the circumference, The supporting ring (15) is provided with a positioning flange (19) matched with the positioning groove (18). 10. The orbital ball valve for easy replacement of packing according to claim 9, characterized in that: the support ring (15) is coaxially provided with a large circular groove (20) and a small circular hole (21) from the inside to the outside, so that A small screw hole (22) corresponding to the small round hole (21) is opened on the inner wall of the valve body (1), and the screw part of the locking screw (14) passes through the small round hole (21) and Screwed into the small screw hole (22), the screw head of the locking screw (14) is embedded in the large circular groove (20) and abuts against the inner end surface of the large circular groove (20).

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