CN115199777A - A top-mounted metal hard-sealed hemispherical valve with bidirectional sealing and online disassembly and maintenance - Google Patents

Abstract

The invention discloses a top-mounted metal hard-sealed half-ball valve with bidirectional sealing and online disassembly and maintenance, comprising a valve body, a ball body, a valve cover and a valve stem. The first flow channel and the second flow channel, the valve cover is installed on the upper end of the valve body, the valve stem penetrates the valve cover, and the inner end of the valve stem is connected with the ball body; it also includes a valve seat assembly, and the valve seat assembly includes a valve seat ring, and the valve seat ring is provided with There is a metal hard seal part, a slideway is arranged in the first flow channel, the valve seat ring is slidably arranged in the slideway, and the first flow channel is provided with a front floating seal component and a rear floating seal component acting on the valve seat ring. When the valve is opened, the valve A preset gap is set between the outer end surface of the seat ring and the outer end surface of the slideway. When the valve is closed, the valve seat ring is pushed by the ball, and the outer end surface of the valve seat ring is in conflict with the outer end surface of the slideway. The invention has the advantages of long-term stable and reliable sealing performance with bidirectional full pressure difference and anti-jamming and anti-scouring, and can be easily and conveniently disassembled and maintained online.

Description

A top-mounted metal hard-sealed hemispherical valve with bidirectional sealing and online disassembly and maintenance

technical field

The invention relates to the technical field of valves, in particular to a top-mounted metal hard-sealed hemispherical valve with bidirectional sealing and online disassembly and maintenance.

Background technique

In oil and gas field exploitation, oil refining chemical industry, coal chemical industry, polysilicon and other chemical industries, the working condition parameters are getting higher and higher, the severity of the medium is getting higher and higher, and the valve requirements for this harsh working condition are getting higher and higher. It not only requires tight sealing, but also must be suitable for reliable application in high temperature, high pressure and multi-phase flow medium, and cannot cause the problem of blocking, poor operation, or even valve failure of the applied valve due to the harsh medium. At the same time, in some devices , It is also required that the valve can be safely and conveniently disassembled and maintained online when the pipeline or device is overhauled.

Before that, various metal hard-sealed ball valves emerged in the valve industry, which could be used reliably in harsh media. However, since metal hard-sealed ball valves usually have valve seats at both ends, the ball is clamped between the two valve seats. The medium working condition with high solid content can easily cause the valve cavity medium to be difficult to discharge and deposit, which will cause the valve to run poorly, or even to be blocked and unable to close.

As a result, many valve companies have successively launched the design of a single-seat metal hard-sealed ball valve, but they have not really achieved the performance guarantee of the valve's bidirectional full pressure difference and complete sealing. At the same time, because the valve is mainly side-mounted, it cannot be realized Disassembly and maintenance function.

In recent years, top-mounted single-seat ball valves have also appeared in the valve industry, such as "C" ball, "U" ball and other design structures, all of which promise to achieve two-way sealing and online disassembly, but after practical application, it is found that, The valve can achieve full differential pressure sealing performance in a single flow direction, but the reverse differential pressure cannot achieve full differential pressure sealing and long-term operation reliability, and there are many design parts, and online disassembly and assembly is very cumbersome, and even requires special tooling. To achieve, the cost is high and the operation is difficult, and it is not suitable for mass production.

In order to solve these problems, especially to achieve long-term stable and reliable sealing performance of true bidirectional full pressure difference, anti-jamming and anti-scouring, and simple and convenient online disassembly and maintenance, a more advanced and more simple and convenient method must be adopted. The structure is designed and applied.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a top-mounted metal hard-sealed hemispherical valve with two-way sealing and online disassembly and maintenance. Convenient online disassembly and maintenance.

In order to achieve the above purpose, the present invention provides the following technical solutions: a top-mounted metal hard-sealed hemispherical valve with bidirectional sealing that can be disassembled and maintained online, including a valve body, a sphere, a valve cover and a valve stem, and a valve body is provided in the valve body. The two ends of the valve body are respectively provided with a first flow channel and a second flow channel that communicate with the valve cavity, the ball is arranged in the valve cavity, the valve cover is installed on the upper end of the valve body, and the valve stem The valve cover is arranged through the valve cover, and the inner end of the valve stem extends into the valve cavity to be linked with the ball; it also includes a valve seat assembly installed in the first flow channel, and the valve seat assembly includes a valve seat ring, so The valve seat ring is provided with a metal hard sealing part for abutting on the surface of the sphere, a slideway is arranged in the first flow channel, the valve seat ring is slidably arranged in the slideway, and the first flow channel is located at both ends of the valve seat ring. There is also a front floating seal assembly and a rear floating seal assembly acting on the seat ring respectively. When the valve is opened, there is a preset gap between the outer end face of the valve seat ring and the outer end face of the slideway. When the valve is closed, the valve is closed. When the seat ring is pushed by the ball, the outer end face of the valve seat ring collides with the outer end face of the slideway.

By adopting the above technical solution, the valve is sealed with a single valve seat on one side, so that the downstream of the valve body can be unblocked, and the medium flow channel is not blocked at all, eliminating the possibility of the medium, especially the solid particles that are easy to deposit, being clamped by the valve seats at the front and rear ends. Problem: The front floating seal assembly and the rear floating seal assembly act on the valve seat ring, no matter whether the medium is flowing in the forward flow channel or in the reverse direction, the metal hard sealing part on the valve seat ring can be pressed against the sphere, and it can also ensure The tightness between the valve seat ring and the inner wall of the slideway can achieve completely reliable and stable sealing performance under the same full differential pressure in the forward and reverse directions, which greatly improves the safety of the valve.

According to the present invention, the valve seat ring is further provided with an annular flange that fits with the inner wall of the slideway, and the front floating seal assembly includes a front disc spring, a front pressure sleeve and The front sealing ring of the seat, the inner end of the slideway is provided with a limit component for abutting the inner end of the front disc spring, and the outer end of the front disc spring is abutted on the front pressure sleeve, so that the front pressure sleeve will hold the front sealing ring of the seat abuts on the inner end face of the annular flange, and the inner circumference of the sealing ring in front of the seat is in close contact with the outer circumference of the valve seat ring, and the outer circumference of the sealing ring in front of the seat is in close contact with the peripheral side of the slideway; the The rear floating seal assembly includes a rear disc spring, a rear pressure sleeve and a rear sealing ring arranged in sequence from the outside to the inside. the rear pressure sleeve, so that the rear pressure sleeve presses the rear sealing ring against the outer end surface of the annular flange, and the inner circumference of the rear sealing ring is closely fitted with the outer circumference of the valve seat ring, and the rear sealing ring The inner circumference of the slideway closely fits the circumference of the slideway.

By adopting the above technical solution, the valve seat ring and the inner wall of the slideway can always be kept highly sealed without leakage.

According to the present invention, the cross-sections of the sealing ring at the front of the seat and the sealing ring at the rear of the seat are both in the shape of an isosceles trapezoid, which is large on the outside and small on the inside. The end face and the end face of the rear pressure sleeve close to the rear sealing ring of the seat are both inclined surfaces, so that a front sealing cavity is formed between the front pressure sleeve and the annular flange, and a rear sealing cavity is formed between the rear pressure sleeve and the annular flange. The sealing ring is arranged in the front sealing cavity, and the rear sealing ring of the seat is arranged in the rear sealing cavity.

By adopting the above technical solution, no matter whether the medium is flowing in the forward direction or in the reverse direction, since the front pressing sleeve acts on the front sealing ring of the seat or the rear pressing sleeve acts on the rear sealing ring of the seat, the front sealing ring or the rear sealing ring of the seat is generated inwardly. The slight deformation in the two directions of the circumference and the outer circumference further improves the sealing performance between the valve seat ring and the inner wall of the slideway.

According to the present invention, a first limit step is provided on the side of the valve seat ring, a first support flange is provided on the rear pressure sleeve for forming a limit with the first limit step, and the A movable gap is provided between the first support flange and the first limit step.

By adopting the above technical solution, the rear pressure sleeve can be limited, which can not only exert a pressing force on the rear sealing ring of the seat, but also avoid damage to the rear sealing ring caused by excessive pressure.

According to the present invention, the outer end of the slideway is provided with an annular groove, the outer end of the valve seat ring is provided with an extension part matched with the annular groove, and the outer periphery of the extension part is provided with the annular groove. Sand control ring that fits tightly around the groove.

By adopting the above technical solution, the effect of dust prevention can be achieved, sand particles can be prevented from entering the slideway, and the wear of the valve seat ring when sliding is reduced.

The present invention further provides that the limiting assembly includes three open rings and a pressure plate, an installation groove is provided at the inner end of the first flow channel, the three open rings are embedded in the installation groove, and the inner wall of the installation groove is provided with an installation groove. A positioning groove is arranged along the circumferential direction, the three open rings are provided with a positioning flange that fits with the positioning groove, the pressure plate is installed on the inner end of the three open rings through a plurality of screws, and the pressure plate is provided with a limit Flange, the position of the front disc spring close to the outer circumference is in conflict with the limit flange, the position of the front disc spring close to the inner circumference is in conflict with the front pressure sleeve, and the position of the front disc spring close to the inner circumference and the pressure plate are provided with activity gap.

By adopting the above technical solution, the structure is simple and reliable, and the position-limiting installation of the valve seat assembly, the front floating seal assembly and the rear floating seal assembly can be realized.

According to the present invention, a first inclined surface is provided on the side of the front pressure sleeve close to the front disc spring, a first movable angle is formed between the first inclined surface and the front disc spring, and the rear pressure sleeve is close to the rear disc spring. One side of the disc spring is provided with a second inclined surface, and a second included angle is set between the second inclined surface and the rear disc spring.

By adopting the above technical solution, not only the elastic effect of the front disc spring and the rear disc spring can be improved, but also a sufficient space for movement of the valve seat ring can be provided.

According to the present invention, the upper and lower ends of the sphere are respectively provided with an upper positioning shaft and a lower positioning shaft, the upper positioning shaft and the lower positioning shaft are arranged coaxially, and the valve cover is provided with an upper positioning shaft corresponding to the upper positioning shaft. The matching upper positioning circular groove, the inner wall of the valve is provided with a lower positioning circular groove matching with the lower positioning shaft, an upper shaft sleeve is arranged between the upper positioning shaft and the upper positioning circular groove, and the lower positioning shaft is provided with an upper shaft sleeve. A lower shaft sleeve is arranged between the positioning shaft and the lower positioning circular groove, a quadrangular shaft hole is formed on the upper positioning shaft, and a quadrangular linkage part that fits with the quadrangular shaft hole is arranged on the inner end of the valve rod.

By adopting the above technical solution, the positioning and installation of the sphere and the linkage connection between the valve stem and the sphere can be realized, the structure is stable and reliable, and the frictional force is small.

According to the present invention, the sphere is an eccentric spherical cap, the center of the sphere and the center of the upper positioning shaft are not on the same center line, the valve cavity is provided with a convex anti-scour portion, and the valve body In the fully open state, the ball is arranged in the anti-scour portion.

By adopting the above technical solution, the eccentric ball can be tightly fitted with the metal hard sealing part of the valve seat ring through the forced eccentric moment to achieve the complete sealing performance of the valve. When the valve is opened, due to the eccentricity of the ball, the sealing surface of the ball will instantly The metal hard seal part separated from the seat ring reduces the friction and wear between the sealing surfaces. At the same time, the sphere is arranged in the anti-scour part, which avoids the scour of the sphere by the medium.

The present invention is further configured to further include a packing seal assembly, the upper end of the valve cover is provided with a sealing groove coaxial with the valve stem, the packing seal assembly includes a packing pressure plate, a packing pressure sleeve and a sealing packing, and the packing pressure plate passes through the bolts It is connected to the upper end of the valve cover, and the packing pressing plate is pressed against the upper end of the packing pressing sleeve, so that the packing pressing sleeve presses the sealing packing in the sealing groove.

By adopting the above technical solution, the sealing performance between the valve stem and the valve cover can be improved, and the leakage of the internal medium from the gap between the two can be avoided.

Description of drawings

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

Fig. 2 is the left side sectional view of the whole of the present invention;

Fig. 3 is the D-D sectional view of Fig. 1;

Fig. 4 is the structural representation of the sphere of the present invention;

5 is a schematic diagram of the flow of a sphere and a fluid in the half-open and half-closed state of the present invention;

6 is a schematic diagram of the flow of a sphere and a fluid in a fully closed state of the present invention;

Fig. 7 is the structural representation of three open loops of the present invention;

8 is a schematic structural diagram of the valve seat assembly in a fully closed state of the present invention;

Figure 9 is a schematic structural diagram of the present invention when the sphere is completely separated from the valve seat ring;

Fig. 10 is a three-dimensional exploded view of the whole of the present invention.

In the figure: 1, valve body; 2, ball; 3, valve cover; 4, valve stem; 5, valve cavity; 6, first flow channel; 7, second flow channel; 8, valve seat assembly; 9, valve seat Ring; 10. Metal hard seal; 11. Slideway; 12. Front floating seal assembly; 13. Rear floating seal assembly; 14. Preset clearance; 15. Ring flange; 16. Front disc spring; 17. Front pressure Sleeve; 18, front sealing ring of seat; 19, limit component; 20, rear disc spring; 21, rear pressure sleeve; 22, rear sealing ring of seat; 23, front sealing chamber; 24, rear sealing chamber; 25, first Limit step; 26, first support flange; 27, movable gap; 28, annular groove; 29, extension; 30, sand control ring; 31, three open rings; 32, pressure plate; 33, installation groove; 34, Positioning groove; 35, positioning flange; 36, screw; 37, limit flange; 38, movable clearance; 39, first slope; 40, first movable angle; 41, second slope; 42, second clip Angle; 43, upper positioning shaft; 44, lower positioning shaft; 45, upper positioning circular groove; 46, lower positioning circular groove; 47, upper shaft sleeve; 48, lower shaft sleeve; 49, quadrilateral shaft hole; 50, quadrilateral linkage part; 51, anti-scour part; 52, packing sealing assembly; 53, sealing groove; 54, packing pressure plate; 55, packing pressure sleeve; 56, sealing packing.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example: As shown in Figures 1 to 10, a top-mounted metal hard-sealed hemi-ball valve with bidirectional sealing that can be disassembled and maintained online includes a valve body 1, a sphere 2, a valve cover 3 and a valve stem 4. The valve The body 1 is provided with a valve cavity 5, and the two ends of the valve body 1 are respectively provided with a first flow channel 6 and a second flow channel 7 that communicate with the valve cavity 5, and the ball 2 is arranged in the valve cavity 5, so The valve cover 3 is installed on the upper end of the valve body 1 by bolts. A middle flange gasket is sandwiched between the valve body 1 and the valve cover 3. The valve cover 3 is connected with a bracket through bolts, and the bracket is used for the installation of various actuators. , such as the matching installation of manual devices, pneumatic devices, electric devices, hydraulic devices, etc., the valve stem 4 is arranged through the valve cover 3, and the inner end of the valve stem 4 extends into the valve cavity 5 and the valve The ball body 2 is linked and connected; the ball valve also includes a valve seat assembly 8 installed in the first flow channel 6 , and the valve seat assembly 8 includes a valve seat ring 9 . The metal hard sealing part 10, the first flow channel 6 is provided with a slideway 11, the valve seat ring 9 is slidably arranged in the slideway 11, and the positions at both ends of the valve seat ring 9 in the first flow channel 6 are also respectively There is a front floating seal assembly 12 and a rear floating seal assembly 13 acting on the valve seat ring 9. When the valve is opened, a preset gap 14 is set between the outer end surface of the valve seat ring 9 and the outer end surface of the slideway 11, and the valve is closed. When the valve seat ring 9 is pushed by the ball 2, the outer end surface of the valve seat ring 9 collides with the outer end surface of the slideway 11. The valve is sealed with a single valve seat on one side, which can make the downstream of valve body 1 unblocked, and the medium flow channel is not blocked at all, which eliminates the problem that the medium, especially the solid particles that are easy to deposit, is clamped by the valve seats at the front and rear ends; the front floating seal The assembly 12 and the rear floating seal assembly 13 act on the valve seat ring 9, and no matter whether the medium flows in the forward flow channel or in the reverse direction, the metal hard sealing part 10 on the valve seat ring 9 can be pressed against the sphere 2, and it can also be To ensure the sealing between the valve seat ring 9 and the inner wall of the slideway 11, so as to achieve completely reliable and stable sealing performance under the same full differential pressure in the forward and reverse directions, and greatly improve the safety of the valve.

As shown in FIG. 8 , the valve seat ring 9 is provided with an annular flange 15 that fits with the inner wall of the slideway 11 , and the front floating seal assembly 12 includes front disc springs arranged in sequence from the inside to the outside. 16. The front pressure sleeve 17 and the seat front sealing ring 18, the inner end of the slideway 11 is provided with a limit assembly 19 for abutting against the inner end of the front disc spring 16, and the outer end of the front disc spring 16 is abutting on the front pressure on the sleeve 17, so that the front pressure sleeve 17 presses the seat front sealing ring 18 against the inner end surface of the annular flange 15, and the inner circumference of the seat front sealing ring 18 closely fits with the outer circumference of the valve seat ring 9, The outer circumference of the front sealing ring 18 of the seat is in close contact with the peripheral side of the slideway 11; the rear floating seal assembly 13 includes a rear disc spring 20, a rear pressure sleeve 21 and a rear seat sealing ring 22, which are sequentially arranged from outside to inside. The outer end of the rear disc spring 20 abuts on the outer end surface of the slideway 11, and the inner end of the rear disc spring 20 abuts on the rear pressure sleeve 21, so that the rear pressure sleeve 21 abuts the rear sealing ring 22 against the annular protrusion. The inner circumference of the seated sealing ring 22 closely fits with the outer circumference of the valve seat ring 9 , and the inner circumference of the seated sealing ring 22 closely contacts the peripheral side of the slideway 11 . The sealing ring 18 before seat and the sealing ring 22 after seat are respectively arranged at the front and rear ends of the valve seat ring 9, and the design can keep a high degree of sealing between the valve seat ring 9 and the inner wall of the slideway 11 without leakage.

As shown in FIG. 8 , the cross-sections of the sealing ring 18 at the front of the seat and the sealing ring 22 at the rear of the seat are both in the shape of an isosceles trapezoid that is large on the outside and small on the inside. One end face of the front sealing ring 18 and one end face of the rear pressing sleeve 21 close to the rear sealing ring 22 are inclined surfaces, so that a front sealing cavity 23 is formed between the front pressing sleeve 17 and the annular flange 15, and the rear pressing sleeve 21 and the annular convex A rear sealing chamber 24 is formed between the edges 15 , the seat front sealing ring 18 is arranged in the front sealing chamber 23 , and the seat rear sealing ring 22 is arranged in the rear sealing chamber 24 . Regardless of whether the medium is flowing forward or reversely, since the front pressure sleeve 17 acts on the front sealing ring 18 of the seat or the rear pressure sleeve 21 acts on the rear sealing ring 22, the front sealing ring 18 or the rear sealing ring 22 of the seat is generated inward. The slight deformation in the two directions of the circumference and the outer circumference further improves the sealing performance between the valve seat ring 9 and the inner wall of the slideway 11 .

As shown in FIG. 8 , the side of the valve seat ring 9 is provided with a first limiting step 25 , and the rear pressing sleeve 21 is provided with a first supporting protrusion for limiting the position with the first limiting step 25 . A movable gap 27 is provided between the first support flange 26 and the first limiting step 25 . The design can limit the position of the rear pressure sleeve 21 , which can not only exert a pressing force on the rear sealing ring 22 of the seat, but also avoid damage to the rear sealing ring 22 caused by excessive pressure.

As shown in FIG. 8 , the outer end of the slideway 11 is provided with an annular groove 28 , and the outer end of the valve seat ring 9 is provided with an extension portion 29 matched with the annular groove 28 , the extension portion 29 The outer circumference of the ring groove 28 is installed with a sand control ring 30 that closely fits the circumferential side of the annular groove 28 . This design can play a dustproof effect, prevent sand particles from entering the slideway 11, and reduce the wear of the valve seat ring 9 when sliding.

As shown in FIG. 8 , the limiting assembly 19 includes three open rings 31 and a pressing plate 32 , an installation groove 33 is provided at the inner end of the first flow channel 6 , and the three open rings 31 are embedded in the installation groove 33 , the inner wall of the installation groove 33 is provided with a positioning groove 34 along the circumferential direction, the three-opening ring 31 is provided with a positioning flange 35 that fits with the positioning groove 34, and the pressing plate 32 is provided with a plurality of screws 36. Installed on the inner end of the three-open ring 31, the pressure plate 32 is provided with a limit flange 37, the position of the front disc spring 16 close to the outer circumference is in conflict with the limit flange 37, and the position of the front disc spring 16 close to the inner circumference is in contact with the limit flange 37. The front pressure sleeve 17 is in conflict, and a movable gap 38 is provided between the part of the front disc spring 16 close to the inner circumference and the pressure plate 32 . The design structure is simple and reliable, and can realize the limit installation of the valve seat assembly 8 , the front floating seal assembly 12 and the rear floating seal assembly 13 .

As shown in FIG. 8 , the side of the front pressure sleeve 17 close to the front disc spring 16 is provided with a first inclined surface 39 , and a first movable angle 40 is formed between the first inclined surface 39 and the front disc spring 16 , A second inclined surface 41 is formed on the side of the rear pressure sleeve 21 close to the rear disc spring 20 , and a second angle 42 is formed between the second inclined surface 41 and the rear disc spring 20 . This design can not only improve the elastic effect of the front disc spring 16 and the rear disc spring 20 , but also provide enough space for the valve seat ring 9 to move.

As shown in FIG. 1 , the upper and lower ends of the sphere 2 are respectively provided with an upper positioning shaft 43 and a lower positioning shaft 44 , the upper positioning shaft 43 and the lower positioning shaft 44 are coaxially arranged, and the valve cover 3 is provided with The upper positioning circular groove 45 is matched with the upper positioning shaft 43. The inner wall of the valve body 1 is provided with a lower positioning circular groove 46 matched with the lower positioning shaft 44. The upper positioning shaft 43 is connected with the upper positioning shaft 44. An upper shaft sleeve 47 is arranged between the circular grooves 45 , a lower shaft sleeve 48 is arranged between the lower positioning shaft 44 and the lower positioning circular groove 46 , and a quadrangular shaft hole 49 is opened on the upper positioning shaft 43 . The inner end of the rod 4 is provided with a quadrangular linkage portion 50 that fits with the quadrangular shaft hole 49 . The design can realize the positioning and installation of the ball body 2 and the linkage connection between the valve stem 4 and the ball body 2, the structure is stable and reliable, and the friction force is small.

As shown in FIG. 2 and FIG. 6 , the spherical body 2 is an eccentric missing spherical cap, the spherical cap of the spherical body 2 is one-third of the whole sphere, and the center of the spherical body 2 is not the same as the center of the upper positioning shaft 43 On the center line, it moves a certain distance on both the horizontal axis and the vertical axis. After the ball 2 is fully opened, its flow channel section is coaxial with the first flow channel 6 and the second flow channel 7. There is an anti-scour portion 51 in a convex shape. When the valve body 1 is fully opened, the ball 2 is arranged in the anti-scour portion 51 . The eccentric ball 2 can be closely fitted with the metal hard sealing part 10 of the valve seat ring through the forced eccentric moment to achieve the complete sealing performance of the valve. When the valve is opened, due to the eccentricity of the ball 2, the sealing surface of the ball 2 will be instantly separated from the metal. The sealing surface 10 of the hard sealing part reduces friction and wear between the sealing surfaces. At the same time, the sphere 2 is arranged in the anti-scour portion 51 to prevent the sphere 2 from being scoured by the medium.

As shown in FIG. 1 , the ball valve further includes a packing seal assembly 52 , the upper end of the valve cover 3 is provided with a seal groove 53 coaxial with the valve stem 4 , and the packing seal assembly 52 includes a packing pressure plate 54 and a packing pressure sleeve 55 And the packing 56 , the packing pressing plate 54 is connected to the upper end of the valve cover 3 by bolts, and the packing pressing plate 54 abuts the upper end of the packing pressing sleeve 55 , so that the packing pressing sleeve 55 presses the sealing packing 56 in the sealing groove 53 . The packing seal assembly 52 can improve the sealing performance between the valve stem 4 and the valve cover 3 to prevent the internal medium from leaking from the gap between the two.

In addition, the valve body 1 is a single integral structure, not a two-piece or three-piece type.

Working principle: a single valve seat assembly 8 is installed in the first flow channel 6, the ball 2 is installed in the valve cavity 5 formed by the valve body 1 and the valve cover 3, and is carried out through the positioning shafts at the upper and lower ends of the ball 2 at the lower end of the valve body 1. Positioning, the valve stem 4 passes through the valve cover 3 and is linked with the ball 2. When any actuator is installed on the bracket, the actuator can be driven to rotate, and the valve can be opened and closed. At this time, when the medium flows from the main flow (the direction from the first flow channel 6 to the second flow channel 7 ), the ball 2 rotates clockwise to close, and first the eccentric ball 2 and the metal hard sealing part 10 of the valve seat ring 9 gradually contact and get close to each other. At the same time, the medium pressure will push the valve seat ring 9 to closely match the ball 2 to form the necessary sealing specific pressure to achieve the tight sealing performance of the valve. At this time, the outer periphery of the valve seat ring 9 is sealed by the rear sealing ring 22. When the main flow direction is reversed (the direction in which the second flow channel 7 faces the first flow channel 6 ), similarly, the eccentric ball 2 rotates clockwise to make the sealing surface of the ball 2 gradually close to the metal hard sealing portion 10 of the valve seat ring 9. A preset gap 14 is set between the valve seat assembly 8 and the valve body 1. The preset gap 14 is smaller than the axial distance of the eccentric stroke of the sphere 2. Before the sphere 2 is about to be completely closed, the valve seat ring 9 will abut against the outer end surface of the slideway 11. Can not continue to retreat, the eccentric ball 2 can be closely fitted with the metal hard sealing part 10 on the valve seat ring 9 through the forced eccentric moment to achieve the complete sealing performance of the valve. The sealing ring 18 seals. As a result, a top-mounted bidirectional metal hard-sealed hemispherical valve that can be disassembled and assembled online fully realizes completely reliable and stable sealing performance under the same full differential pressure in the forward and reverse directions.

When the valve is opened, due to the eccentricity of the sphere 2, the sealing surface of the sphere 2 will be instantly separated from the metal hard sealing part 10 of the valve seat ring 9, reducing the friction and wear between the sealing surfaces. One side of the sphere 2 is completely open without obstruction, the downstream of the valve body 1 is unobstructed without the valve seat assembly 8, and the flow of the medium is not blocked at all, eliminating the medium, especially the solid particles that are easy to deposit, being clamped by the valve seat rings 9 at the front and rear ends. The problem is that the other side of the sphere 2 has a suitable medium flow gap with the valve body 1. When the sphere 2 is half-open and half-closed, the medium on this side flows faster, and it is easy to remove the adhesive medium on the surface of the sphere 2. , to achieve the purpose of cleaning the sphere 2. After the sphere 2 is fully opened, it is completely consistent with the flow channel of the valve body 1, and the spherical cap of the sphere 2 can be hidden in the anti-scour part 51 of the valve cavity 5 without direct contact with the medium, which not only ensures various types of The smooth flow of the medium further prevents the sphere 2 from being washed by the medium.

When the pipeline device needs to be repaired, the valve does not need to disassemble the pipeline as a whole, just open the valve cover 3 on the upper end of the valve body 1, and then the valve stem 4, the ball body 2, the valve cover 3, the valve seat assembly 8, etc. can be installed one by one. After dismantling and inspection, since the spherical cap of the sphere 2 is only 1/3 of the whole sphere, the sphere 2 can be easily taken out from the upper end of the valve body 1 with a slight side tilt. Three open rings 31, when loosening the screws 36 to remove the pressing plate 32, the three sections of the three open rings 31 can be easily removed one by one, and the front floating seal assembly 12, the valve seat assembly 8 and the rear floating seal assembly 13 can also be sequentially On the contrary, the online installation can be reversed, and no special tools are required for disassembly and assembly, so as to achieve the purpose of online maintenance and maintenance that is truly easy to disassemble and install.

Claims (10)

1. A top-mounted metal hard-sealed hemi-ball valve with bidirectional sealing that can be disassembled and maintained online, comprising a valve body (1), a sphere (2), a valve cover (3) and a valve stem (4), the valve body ( 1) A valve cavity (5) is provided inside, and both ends of the valve body (1) are respectively provided with a first flow channel (6) and a second flow channel (7) communicating with the valve cavity (5). The ball (2) is arranged in the valve cavity (5), the valve cover (3) is installed on the upper end of the valve body (1), the valve stem (4) is arranged through the valve cover (3), and the valve The inner end of the rod (4) extends into the valve cavity (5) and is linked with the ball (2); it is characterized in that it further comprises a valve seat assembly (8) installed in the first flow channel (6), the The valve seat assembly (8) includes a valve seat ring (9), the valve seat ring (9) is provided with a metal hard sealing part (10) for abutting against the surface of the ball (2), and the first flow channel (6) A slideway (11) is provided inside, the valve seat ring (9) is slidably arranged in the slideway (11), and the first flow channel (6) is also provided with two ends of the valve seat ring (9) respectively. A front floating seal assembly (12) and a rear floating seal assembly (13) acting on the valve seat ring (9), when the valve is opened, between the outer end face of the valve seat ring (9) and the outer end face of the slideway (11) is provided. There is a preset gap (14), when the valve is closed, the valve seat ring (9) is pushed by the ball (2), and the outer end surface of the valve seat ring (9) collides with the outer end surface of the slideway (11). 2. A top-mounted metal hard-sealed hemispherical valve with bidirectional sealing and online disassembly and maintenance according to claim 1, characterized in that: the valve seat ring (9) is provided with the slideway (11) ) an annular flange (15) whose inner walls are in contact with each other, the front floating seal assembly (12) includes a front disc spring (16), a front pressure sleeve (17) and a front seat seal ring (18) arranged in sequence from the inside to the outside ), the inner end of the slideway (11) is provided with a limit component (19) for abutting against the inner end of the front disc spring (16), and the outer end of the front disc spring (16) abuts the front pressure sleeve (17) ), so that the front pressure sleeve (17) presses the seat front sealing ring (18) against the inner end face of the annular flange (15), and the inner circumference of the seat front sealing ring (18) is in contact with the valve seat ring The outer circumference of (9) is closely fitted, and the outer circumference of the seat front sealing ring (18) is closely fitted with the peripheral side of the slideway (11). The spring (20), the rear pressure sleeve (21) and the rear sealing ring (22), the outer end of the rear disc spring (20) abuts the outer end surface of the slideway (11), the The inner end abuts on the rear pressure sleeve (21), so that the rear pressure sleeve (21) abuts the seat rear sealing ring (22) on the outer end surface of the annular flange (15), and the seat rear sealing ring ( The inner circumference of 22) is in close contact with the outer circumference of the valve seat ring (9), and the inner circumference of the rear sealing ring (22) is in close contact with the peripheral side of the slideway (11). 3. A top-mounted metal hard-sealed hemispherical valve with bidirectional sealing and on-line disassembly and maintenance according to claim 2, characterized in that: the sealing ring (18) in front of the seat and the sealing ring (22) behind the seat are separated from each other. The cross-section is in the shape of an isosceles trapezoid with a large outside and a small inside, the two end faces of the annular flange (15), the end face of the front pressure sleeve (17) close to the front sealing ring (18) of the seat, and the rear pressure sleeve (21) close to One end face of the rear sealing ring (22) is inclined, so that a front sealing cavity (23) is formed between the front pressing sleeve (17) and the annular flange (15), and the rear pressing sleeve (21) and the annular flange (15) form a front sealing cavity (23). A rear sealing cavity (24) is formed between ), the seat front sealing ring (18) is arranged in the front sealing cavity (23), and the seat rear sealing ring (22) is arranged in the rear sealing cavity (24). 4. A top-mounted metal hard-sealed hemispherical valve with bidirectional sealing and online disassembly and maintenance according to claim 3, characterized in that: the side of the valve seat ring (9) is provided with a first limit step (25), the rear pressing sleeve (21) is provided with a first support flange (26) for forming a limit with the first limit step (25), and the first support flange (26) is connected with the first limit step (25). A movable gap (27) is provided between the first limiting steps (25). 5. A top-mounted metal hard-sealed hemi-ball valve with bidirectional sealing and online disassembly and maintenance according to claim 2, characterized in that: an annular groove (28) is provided at the outer end of the slideway (11), The outer end of the valve seat ring (9) is provided with an extension part (29) matched with the annular groove (28); Tight-fitting sand control ring (30). 6. The top-mounted metal hard-sealed hemispherical valve with bidirectional sealing and online disassembly and maintenance according to claim 2, characterized in that: the limit assembly (19) comprises a three-open ring (31) and a pressure plate ( 32), the inner end of the first flow channel (6) is provided with an installation groove (33), the three-opening ring (31) is embedded in the installation groove (33), and the inner wall of the installation groove (33) A positioning groove (34) is arranged along the circumferential direction, a positioning flange (35) that fits with the positioning groove (34) is arranged on the three open rings (31), and the pressing plate (32) passes through a plurality of screws (36) is installed on the inner end of the three-opening ring (31), the pressure plate (32) is provided with a limit flange (37), and the position of the front disc spring (16) close to the outer periphery and the limit flange (37) In conflict, the part of the front disc spring (16) close to the inner circumference is in conflict with the front pressure sleeve (17), and there is a movable gap (38) between the part of the front disc spring (16) close to the inner circumference and the pressure plate (32) . 7. A top-mounted metal hard-sealed hemi-ball valve with bidirectional sealing and online disassembly and maintenance according to claim 2, characterized in that: the front pressure sleeve (17) is close to the side of the front disc spring (16) A first inclined surface (39) is provided, a first movable angle (40) is set between the first inclined surface (39) and the front disc spring (16), and the rear pressure sleeve (21) is close to the rear disc spring ( 20) is provided with a second inclined surface (41) on one side, and a second included angle (42) is provided between the second inclined surface (41) and the rear disc spring (20). 8. A top-mounted metal hard-sealed hemi-ball valve with bidirectional sealing and online disassembly and maintenance according to claim 1, characterized in that: the upper and lower ends of the sphere (2) are respectively provided with an upper positioning shaft ( 43) and a lower positioning shaft (44), the upper positioning shaft (43) and the lower positioning shaft (44) are coaxially arranged, and the valve cover (3) is provided with an upper positioning shaft (43) matched with the upper positioning shaft (43). A positioning circular groove (45), the inner wall of the valve body (1) is provided with a lower positioning circular groove (46) matched with the lower positioning shaft (44), and the upper positioning shaft (43) is connected with the upper positioning circle An upper shaft sleeve (47) is arranged between the grooves (45), a lower shaft sleeve (48) is arranged between the lower positioning shaft (44) and the lower positioning circular groove (46), and the upper positioning shaft (43) A quadrangular shaft hole (49) is opened on the upper part, and the inner end of the valve rod (4) is provided with a quadrangular linkage part (50) which fits with the quadrangular shaft hole (49). 9 . The top-mounted metal hard-sealed hemispherical valve with bidirectional sealing and online disassembly and maintenance according to claim 8 , wherein the sphere ( 2 ) is an eccentric spherical cap, and the sphere ( 2 ) The center of the valve and the center of the upper positioning shaft (43) are not on the same center line, the valve cavity (5) is provided with a convex anti-scour portion (51), when the valve body (1) is fully open, all The spherical cap of the spherical body (2) is arranged in the anti-scour portion (51). 10. A top-mounted metal hard-sealed hemi-ball valve with bidirectional sealing and online disassembly and maintenance according to claim 1, characterized in that: it further comprises a packing seal assembly (52), and an upper end of the valve cover (3) is provided with a There is a sealing groove (53) coaxial with the valve stem (4). The packing sealing assembly (52) includes a packing pressing plate (54), a packing pressing sleeve (55) and a sealing packing (56). The packing pressing plate (54) ) is connected to the upper end of the valve cover (3) by bolts, and the packing pressing plate (54) is pressed against the upper end of the packing pressing sleeve (55), so that the packing pressing sleeve (55) presses the sealing packing (56) in the sealing groove (53).

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