CN219082306U - Six eccentric double valve seat metal hard seal ball valve - Google Patents

Abstract

The utility model provides a six eccentric double valve seat metal hard seal ball valve, includes well valve body, side valve body, spheroid, seal assembly, disk seat, valve shaft, valve gap, gland, bottom and drive mechanism, the spheroid all forms the boss on two hemispheres on a left side, right side, all install the sealing washer on the boss and make sealing between disk seat and the spheroid, sealing washer and the sealed department of disk seat be sealing washer sealing face and disk seat sealing face, the perpendicular distance of valve shaft central line and relative sealing washer plane center forms first eccentric distance E1, the distance of spheroid shaft hole central line and the sealing washer internal diameter central line on right side forms second eccentric distance E2, the distance between the sealing washer internal diameter central line on left side and the sealing washer internal diameter central line on right side forms third eccentric distance E3; the valve has the advantages that the full bidirectional pressure zero leakage sealing performance and the bidirectional flow unlimited installation effect of the valve are guaranteed, the sealing performance is high, and the efficiency can be obviously improved during installation.

Description

Six eccentric double valve seat metal hard seal ball valve

Technical Field

The utility model relates to a ball valve, in particular to a six-eccentric double-valve-seat metal hard sealing ball valve, and especially relates to a six-eccentric double-valve-seat elliptical cone bevelled perfect circle metal hard sealing ball valve.

Background

Ball valves have the characteristic of full circulation, and are widely used in many fields such as petroleum, chemical industry, metallurgy, water and electricity as a component for realizing on-off and flow control of a pipeline system.

The sealing forms of ball valves are commonly known as soft and hard seals. The traditional soft sealing ball valve is of a spherical sealing structure, and the valve seat sealing material is mainly made of various nonmetallic materials such as rubber, polytetrafluoroethylene, high polymer materials and the like. However, due to the limitation of material characteristics, the alloy is not suitable for severe working conditions such as high temperature resistance, high pressure resistance, corrosion resistance, abrasion resistance and the like. Later, on the basis of the traditional soft sealing ball valve, the valve seat is changed to be made of a metal sealing material, namely the conventional hard sealing ball valve. However, the ball body of the conventional hard seal ball valve is a complete right circular ball type, the sealing structure form is not changed at all, and the ball body is always a complete spherical sealing structure. In the whole opening and closing process of the conventional hard sealing ball valve, the metal sealing valve seat and the ball body are always in a hard friction state, so that the valve seat and the ball body surface are easy to wear and scratch, the sealing performance can be poor, and the service life of the ball valve is reduced; meanwhile, the friction state of the metal hard seal causes that the opening and closing torque of the hard seal ball valve is more than twice as high as that of the soft seal ball valve, the cost of an actuating mechanism is increased, the economy is poor, and more practicability and better functional effects are not achieved.

From the above description, the existing soft sealing ball valve and the hard sealing ball valve are both spherical position sealing structures, and the sealing is always in friction extrusion abrasion in the opening and closing process of the valve. The valve has large torque, easy abrasion, short service life and poor sealing, and the defects are obvious.

In order to solve the problems, the eccentric ball valve is gradually developed on the basis of the conventional hard seal ball valve in the later technical improvement process, and the sealing structure adopts the three-eccentric, four-eccentric and even five-eccentric sealing structure of the butterfly valve, namely the eccentric hard seal ball valve such as the eccentric half ball valve, the C-shaped ball valve and the like. The eccentric hard seal ball valve abandons the position seal under the elastic extrusion friction state, realizes the torque seal, and is opened and separated from the valve seat, and is closed and sealed when the valve seat is opened and closed in the opening and closing process of the ball valve, and the whole process between the sealing pairs is not in the friction and abrasion state. The eccentric hard sealing ball valve has the advantages of good sealing performance, small torque, long service life and the like.

However, currently, all types of eccentric hard seal ball valves such as eccentric half ball valves, C-shaped ball valves and the like have radial eccentricity relative to the center line of a valve body flow passage due to the center of a valve shaft, and the radial eccentricity leads to the sealing structure of all eccentric hard seal ball valves to have and only have one sealing pair, namely a single-sealing unidirectional pressure structure. Therefore, all common eccentric hard seal ball valves lose the most fundamental advantages of double seal pair structure, bidirectional equal pressure seal and double flow direction unrestricted installation of the traditional ball valves.

In view of the above reasons, a novel metal hard sealing ball valve is designed, and the ball valve can not only keep the inherent advantages of double valve seats, double sealing and double flow directions of the traditional ball valve, but also has the technical advantages of high temperature resistance, corrosion resistance, abrasion resistance, scouring resistance, no friction in opening and closing, small torque, flexible opening and closing, long service life, convenient disassembly and maintenance and the like, which is always the direction of the efforts of the technicians in the field.

Disclosure of Invention

In view of this, the present utility model provides a six-eccentric double-seat metal hard-seal ball valve.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model provides a six eccentric double valve seat metal ball valve, includes well valve body, side valve body, spheroid, seal assembly, disk seat, valve shaft, valve gap, gland, bottom and drive mechanism, the spheroid is connected with the valve shaft, and drive mechanism drives the valve shaft and rotates, the disk seat is installed in the side valve body, and the spheroid supports in the disk seat, form the valve pocket between well valve body and the side valve body, the spheroid is located the valve pocket, the radius of the left and right hemispheres of spheroid is the same but the centre of sphere is different, seal assembly includes the sealing washer, the spheroid all forms the boss on left and right hemispheres, all install the sealing washer on the boss and make seal between disk seat and the spheroid, sealing washer sealing face and the disk seat are in sealing washer sealing face in sealing washer, the perpendicular distance of valve shaft central line and opposite sealing washer plane center forms first eccentric distance E1, and the distance between the sealing washer internal diameter central line of spheroid shaft hole and the sealing washer internal diameter central line on right side forms third eccentric distance E3;

when the ball valve is just opened, the sealing ring is separated from the valve seat, gaps X1 and X2 are respectively formed between the sealing ring sealing surface of the left hemisphere and the corresponding valve seat sealing surface, and gaps X2 and X1 are respectively formed between the sealing ring sealing surface of the right hemisphere and the corresponding valve seat sealing surface; when the ball valve is fully opened to 90 degrees, gaps Y1 and Y2 are respectively formed between the sealing ring of the left hemisphere and the corresponding two valve seats, and gaps Y2 and Y1 are respectively formed between the sealing ring of the right hemisphere and the corresponding two valve seats.

Preferably, the sealing surfaces of the valve seats corresponding to the left hemisphere and the right hemisphere are respectively a part of an oblique elliptical cone, and the triangular section where the conical top point of each oblique elliptical cone and the long axis of the elliptical bottom surface are located is coplanar with the central line of the valve flow passage and is perpendicular to the axis of the shaft hole of the sphere.

Preferably, the central lines of the two oblique elliptical cones are parallel, and the distance between the two oblique elliptical cones is L, wherein l= 2.5E3-3E 3.

Preferably, a fourth eccentric distance E4 is formed between the vertex of each oblique elliptical cone and the central line of the valve body flow passage, and an included angle between the central line of each oblique elliptical cone and the central line of the valve body flow passage forms an eccentric angle gamma.

Preferably, the cross section taking the central line of each oblique elliptical cone as a reference has the included angles alpha and beta between the upper sealing cone line and the lower sealing cone line and the central line unequal, and the cross section can freely pass through the intersection point of the vertical line on any point on the central line of the cone on the central line section of each oblique elliptical cone and the upper cone line and the lower cone line in the section, and the upper distance and the lower distance between the vertical line and the intersection point of the central line of the oblique elliptical cone are equal.

Preferably, the sealing rings are metal sealing rings, the two metal sealing rings are respectively connected and fixed on annular bosses on two sides of the sphere through screws and pressing rings, and a gap K is formed between the inner diameter of each sealing ring and the outer diameter of the corresponding spherical annular boss, so that the sealing rings are arranged in a floating type adjusting mode on the spherical boss.

Preferably, k=2 to 4mm, and k= 0.5E3.

Preferably, when the ball valve is fully opened to 90 degrees, Y1 is less than K and less than Y2.

Preferably, the diameter of the valve path is defined as D, e3=2e2, e1=0.5d+ (5-8) E3.

The utility model has the beneficial effects that: the ball valve has the advantages of full circulation, double valve seats, double cutoff and double flow directions, and has the advantages of low torque, no interference friction of a switch, self-adaptive sealing and zero leakage of sealing; the axial eccentricity E1 ensures that the valve rod does not pass through the sealing ring, so that the sealing ring is a continuous and complete sealing ring, the second eccentricity E2 formed by the distance between the center line of the spherical shaft hole and the center line of the inner diameter of the right sealing ring enables the center line of the inner diameter of the right sealing ring to deviate from one side of the center of the shaft hole, a cam effect is formed, the two eccentric distances are matched with the fourth eccentricity E4, and the fact that the included angles between the circumference of the sealing pair and the center line of the runner are unequal in the opening and closing process of the butterfly plate is ensured, so that the cam sealing effect is formed; when the valve is just opened, the sealing ring is separated from the valve seat; when the valve is just closed, the sealing ring is contacted with the valve seat to generate sealing, so that the valve can be opened and closed quickly; the whole switching process, the sealing pair can not produce interference and friction phenomena, the two sealing pair systems can be ensured to exist independently and work normally, meanwhile, the technical problem of double sealing of the double valve seats of the eccentric metal-like hard sealing ball valve in the prior art can be solved, and the valve is ensured to realize complete bidirectional pressure zero leakage sealing performance and bidirectional flow unlimited installation effect.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a front cross-sectional view of a six-eccentric double-valve seat metal hard seal ball valve;

FIG. 2 is a left side view of the ball valve;

FIG. 3 is a top cross-sectional view of the valve when fully closed;

FIG. 4 is a top cross-sectional view of the valve when fully open;

FIG. 5 is a top cross-sectional view of the valve just before opening;

FIG. 6 is an enlarged view of FIG. 3 at A;

FIG. 7 is an enlarged view of FIG. 5 at B;

fig. 8 is an enlarged view at C in fig. 5.

Reference numerals:

1. a bottom cover; 2. a middle valve body; 3. a side valve body; 4. a flange bolt; 5. a lower valve shaft; 6. a valve seat; 7. a valve seat gasket; 8. a gasket of a sealing ring; 9. a seal ring; 10. a pressing ring; 11. a sphere; 12. an upper valve shaft; 13. a valve cover; 14. a shaft sleeve; 15. a flange gasket; 16. a filler; 17. pressing the sleeve; 18. a gland; 19. a bracket; 20. a flat key; 21. a worm wheel; 22. a boss; 23. sealing surfaces of the sealing rings; 24. sealing surface of valve seat.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model will be further described with reference to the drawings.

The utility model provides the following technical scheme:

the utility model discloses a six-eccentric double-valve-seat metal hard sealing ball valve, which is shown by referring to figures 1 to 8, and comprises a middle valve body 2, a side valve body 3, a ball 11, a sealing component, a valve seat 6, a valve shaft, a valve cover 13, a gland 18, a bottom cover 1 and a transmission mechanism, wherein the ball 11 is connected with the valve shaft, the transmission mechanism drives the valve shaft to rotate, the valve seat 6 is arranged in the side valve body 3, the ball 11 is supported in the valve seat 6, a valve cavity is formed between the middle valve body 2 and the side valve body 3, the ball 11 is positioned in the valve cavity, the radiuses of left and right hemispheres of the ball 11 are the same but the centers of the balls are different, the sealing component comprises a sealing ring 9, the ball 11 forms a boss 22 on both the left and right hemispheres, the boss 22 is provided with the sealing ring 9 so that the valve seat 6 and the ball 11 are sealed, and the sealing part between the sealing ring 9 and the valve seat 6 is a sealing ring sealing surface 23 and a valve seat 24.

Specifically, referring to fig. 1, the middle valve body 2 and the side valve body 3 are coupled together by a flange bolt 4 and maintained in a sealed state by a flange gasket 15. The bottom cover 1 is fixedly connected to the bottom of the middle valve body 2 through bolts and gaskets and is sealed with the middle valve body 2 so as to prevent medium leakage of the lower valve shaft hole. The valve cover 13 is fixedly connected to the top of the side valve body 3 through screws and gaskets and is sealed with the side valve body 3, the valve shaft comprises an upper valve shaft 12 and a lower valve shaft 5 which are arranged on two sides of the ball, an upper valve shaft hole is arranged in the valve cover 13, shaft sleeves 14 are respectively arranged in the upper valve shaft hole and the lower valve shaft hole, the upper valve shaft 12 penetrates through the shaft sleeve 14 hole, and the square head at the lower end of the upper valve shaft 12 is connected with the upper end hole of the ball 11. The top of the middle valve body is provided with a bracket 19, and the round shaft head at the upper end of the upper valve shaft 12 is connected with an actuating mechanism through a flat key 20. The lower end of the lower valve shaft 5 is connected with the middle valve body 2, and the upper end of the lower valve shaft 5 is rotatably connected with the ball 11. The packing 16 is arranged in a packing ring of the valve cover 13, the upper end of the packing ring is pressed by a pressing sleeve 17, and a pressing cover 18 is arranged on the pressing sleeve and is fixedly adjusted through bolts and nuts, so that the upper valve shaft 12 and the valve cover 13 are sealed. (see FIG. 1)

The sealing component of the ball valve mainly comprises a valve seat gasket 7, a sealing ring gasket 8, a sealing ring 9, a pressing ring 10 and screws. The metal sealing ring 9, the sealing gasket 8 and the pressing ring 10 are connected and fixed on the ball 11 through screws, keep sealing to be an integral part and rotate along with the ball, so that the switching function of the ball valve is realized. The valve seat 6 and the valve seat gasket 7 are fixedly connected on the concave surface inside the side valve body 3 through screws. The sealing rings 9 at the left end and the right end of the ball body and the valve seat 6 respectively form a left sealing pair and a right sealing pair to form a double-valve seat sealing system of the ball valve. The sealing surfaces of the sealing ring 9 and the valve seat 6 are beveled by an elliptical cone to obtain a perfect circle sealing geometry mechanism (see figure 3).

The lower end of the lower valve shaft 5 of the ball valve penetrates into the shaft hole of the valve body 2 and props against the upper plane of the bottom cover 1, the upper end of the lower valve shaft penetrates into the lower shaft hole of the ball 11 and props against the ball 11, and the ball 11 rotates around the lower valve shaft 5. The lower end head part of the upper valve shaft 12 is inserted into the square hole at the upper part of the sphere 11, the middle part of the upper valve shaft 12 passes through the inner hole of the valve cover 13, the upper end of the upper valve shaft 12 is provided with a key groove, and the upper end of the upper valve shaft 12 is connected with an actuating mechanism of the worm wheel 21 through a flat key 20. The worm wheel 21 rotates to drive the upper valve shaft 12 and the ball 11 to rotate together, thereby realizing the opening and closing functions of the ball valve (see fig. 1). The transmission mechanism of the ball valve can be one of a gear type transmission mechanism, a worm gear type transmission mechanism, a cam type transmission mechanism and the like, and the disclosure of the utility model is not limited. Specifically, a first eccentricity E1 is formed by the vertical distance between the center line of the valve shaft and the plane center of the opposite sealing ring, a second eccentricity E2 is formed by the distance between the center line of the spherical shaft hole and the center line of the inner diameter of the sealing ring on the right side, and a third eccentricity E3 is formed by the distance between the center line of the inner diameter of the sealing ring on the left side and the center line of the inner diameter of the sealing ring on the right side; when the ball valve is just opened, the sealing ring is separated from the valve seat, gaps X1 and X2 are respectively formed between the sealing ring sealing surface of the left hemisphere and the corresponding valve seat sealing surface, and gaps X2 and X1 are respectively formed between the sealing ring sealing surface of the right hemisphere and the corresponding valve seat sealing surface; when the ball valve is fully opened to 90 degrees, gaps Y1 and Y2 are respectively formed between the sealing ring of the left hemisphere and the corresponding two valve seats, and gaps Y2 and Y1 are respectively formed between the sealing ring of the right hemisphere and the corresponding two valve seats.

The unique sealing structure design of the sealing ring 9 and the valve seat 6 ensures that when the ball valve is just opened, the sealing ring is separated from the valve seat, and the two sealing surfaces respectively form gaps X1 and X2, so that the ball valve can be opened, separated and closed, namely sealed, and meanwhile, a sealing pair has no friction in the opening and closing process (see figure 5). The sphere 12 is an irregularly symmetrical sphere, but is composed of a left hemisphere and a right hemisphere, a distance eccentricity E3 exists between a sphere center B of the left hemisphere and a sphere center A of the right hemisphere, a center line of the inner diameter of the left sealing ring and the outer diameter of the valve seat is collinear with the point B of the left hemisphere, a center line of the inner diameter of the right sealing ring and the outer diameter of the valve seat is collinear with the point A of the right hemisphere, and therefore, a distance eccentricity E3 exists between the center lines of the inner diameters of the sealing rings of the two sealing pairs and the outer diameter of the valve seat. When the ball valve is fully opened to 90 degrees, the eccentric E3 ensures that a certain gap Y1 and Y2 is reserved between one sealing ring in the two sealing pairs and the two valve seats, namely, when the ball valve is fully opened, collision and interference cannot be generated between the sealing ring and the valve seats, so that the sealing effect of the double valve seats for realizing metal hard sealing on the ball valve is realized (see figure 4). The distance between the center lines of the two sealing pairs is E3, and the center lines of the elliptic conical surfaces of the two sealing pairs are distributed in mirror image asymmetry along the center line of the sphere flow passage hole. The center lines of the two sealing pairs are eccentric from the center line of the shaft hole up and down by a distance E2, but the left hemisphere, the right hemisphere, the sealing ring and the valve seat are mutually overlapped and distributed after rotating 180 degrees by the center line of the shaft hole of the sphere. The left hemisphere, the right hemisphere and the left sealing pair are in non-mirror symmetry design along the center line of the sphere flow channel, but the left hemisphere, the right hemisphere and the left sealing pair are mutually overlapped and symmetrically distributed after rotating 180 degrees along the center line of the shaft hole, so that the two sealing pairs can be ensured not to interfere with each other and collide when being opened by 90 degrees, and the two sealing pair systems can be ensured to exist independently and work normally. The structural design of non-bilateral symmetry and mutual overlapping distribution after rotating 180 degrees along the center of the shaft hole and the design of the transmission asymmetric sphere have essential help removing, can ensure that two sealing subsystems are not interfered with each other and work independently, and fundamentally solve the technical problem that the prior eccentric metal-like hard sealing ball valve cannot have double sealing of double valve seats. The valve shaft of the six-eccentric double-valve seat metal sealing ball valve is positioned at the geometric center of the valve body, and the valve shaft and the center of the flow channel have no eccentric value, so that the eccentric unbalanced moment of pressure acting on the ball body is very small, and even the eccentric unbalanced moment and the eccentric unbalanced moment can be counteracted to be zero. Any one of the sealing pairs on the left side and the right side of the ball valve can independently realize the effect of bidirectional zero leakage. When the medium passes through the first sealing pair, if a certain leakage amount exists, the leaked medium can enter the inner cavity of the valve body, the pressure of the medium in the body cavity is relatively small, and the medium is difficult to leak through the second sealing. That is, the double sealing mechanism of the six-eccentric metal hard sealing ball valve ensures that the valve realizes complete bidirectional pressure zero leakage sealing performance and the effect of unrestricted bidirectional flow installation, has high sealing performance and can obviously improve the efficiency during installation.

Specifically, the valve seat sealing surfaces corresponding to the left hemisphere and the right hemisphere of the six-eccentric double-valve seat metal hard sealing ball valve are part of an oblique elliptical cone respectively, and the triangular section where the conical top point of each oblique elliptical cone and the long axis of the elliptical bottom surface are located is coplanar with the central line of the valve flow passage and is perpendicular to the axis of the spherical shaft hole. The central lines of the two oblique elliptical cones are parallel, and the distance between the two oblique elliptical cones is L, wherein L= 2.5E3-3E 3. A fourth eccentric distance E4 is formed between each oblique elliptical cone vertex and the central line of the flow passage of the valve body, and the eccentric E4 of the cone vertex makes the central line of the elliptical cone obliquely arranged, so that the included angles between the circumference of the sealing pair and the central line of the flow passage are unequal, and a cam sealing effect is formed. When the valve is just opened, the sealing ring is separated from the valve seat; upon closing the valve, the sealing ring contacts the valve seat to produce a seal. In the whole switching process, the sealing pair does not generate interference and friction phenomena.

Preferably, the included angle between the central line of each oblique elliptic cone and the central line of the valve body flow passage forms an angle eccentric gamma. The eccentric angle gamma makes the sealing surfaces of the valve body seat and the sealing ring form oblique elliptic conical surfaces to form a cam sealing effect. The sealing ring has no interference and friction phenomenon in the whole switching process along with the rotation and opening and closing movement process of the ball body around the valve shaft. And the sealing ring is closed, i.e. is attached to the valve seat, and is opened, i.e. is separated. And friction and abrasion are not generated between the sealing pairs, so that the sealing reliability and the long service life are ensured.

Specifically, in this embodiment, the cross section of the six-eccentric double-valve seat metal hard seal ball valve with the center line of each oblique elliptical cone is taken as a reference, the included angles α and β between the upper and lower seal cone lines and the center line are unequal, and the vertical line passing through any point on the cone center line on the cross section of the center line of each oblique elliptical cone and the intersection point of the upper and lower cone lines in the cross section are arbitrarily equal to the upper and lower distance from the intersection point of the vertical line and the center line of the oblique elliptical cone. The sealing surface is an oblique elliptical conical surface, the central line of the elliptical conical surface is taken as a reference cross section, the included angles alpha and beta between the upper sealing conical line and the central line of the elliptical conical surface are unequal under the same section, the included angles alpha and beta are equal, the picture measuring angles are the same, and the angles alpha and beta are variables. The sealing structure of the existing triple offset butterfly valve is that an elliptic sealing ring is obtained after a positive cone is beveled, and the cone angle is a fixed value, namely alpha=beta; the six-eccentric double-valve seat metal hard sealing ball valve is different from the traditional three-eccentric butterfly valve, the sealing structure of the six-eccentric butterfly valve is a perfect circular sealing ring obtained by chamfering an elliptical cone, the design conception and the realization form of the six-eccentric butterfly valve are different from those of the traditional eccentric butterfly valve, and the final effect is different. The diameter of the valve diameter is defined as D, E3=2E2, E1=05D+ (5-8) E3, the valve diameter is matched with the arrangement of the right circular sealing ring and the valve seat, when the valve is sealed, the circumferential sealing ratio pressure distribution of the sealing pair is more uniform, leakage points are not easy to generate, in addition, the valve flow passage area is larger, the CV value is larger, the valve is completely close to the sealing passage of the traditional ball valve, and the circulation capacity of the valve is stronger.

The beneficial effects of the present utility model are described in more detail below: the valve shaft of the traditional soft seal and metal seal ball valve is free from eccentricity, belongs to position sealing, and the valve seat and the ball body obtain sealing specific pressure through extrusion compression deformation. Therefore, in the opening and closing process of the traditional ball valve, the sealing ring and the ball body are always in an extrusion friction state, the valve torque is large, the sealing abrasion is fast, and the sealing service life is short. Common C-shaped ball valves, eccentric half ball valves, three-eccentric and four-eccentric hard seal ball valves, because the center of a valve shaft is eccentric in a radial direction relative to a flow passage of a valve body, all the eccentric ball valves only have one sealing pair. Because of the eccentric ball valve, if a double-sealing pair structure is designed, radial eccentricity of the valve shaft inevitably leads to mutual interference collision of the double-sealing pair when the valve is fully opened, so that the double-sealing pair structure cannot be realized, and the purposes of double sealing, double cutoff, double-directional zero leakage and double-flow unrestricted installation cannot be realized. The six-eccentric metal hard seal ball valve eliminates the radial eccentric value of the valve shaft center and the valve body flow passage center, so that the valve shaft center is positioned on the valve body geometric center, thereby creating conditions for realizing double valve seat design, and in cooperation with the valve shaft center, through a unique six-eccentric structure design, the left and right sealing pairs are overlapped and symmetrical after rotating 180 degrees along the valve shaft center, after the valve shaft center is arranged, the pressures in the same direction respectively act on the two sealing pairs, and because the inner diameter centers of the two hemispheres and the sealing rings are just positioned at two sides of the flow passage center line and are equal, the eccentric unbalanced moment acted on the two hemispheres and the sealing rings is just offset to be zero, and the ball valve is equivalent to a central symmetrical valve at the moment. The six eccentric metal hard sealing ball valve sealing pair is a right circular geometric sealing shape obtained after the elliptical cone is beveled, the valve is just opened instantly, the sealing is separated from the valve, and the valve is just closed instantly, and the sealing is contacted, so that the sealing pair has no friction and no friction torque in the opening and closing process of the valve, and the opening and closing torque of the valve is very small. The six-eccentric metal hard seal ball valve realizes torque seal through a unique eccentric design, and the sealing effect is better as the pressure is larger and the specific pressure is larger.

Specifically, the sealing rings are metal sealing rings, the two metal sealing rings are respectively connected and fixed on annular bosses on two sides of the sphere through screws and pressing rings, and a gap K is formed between the inner diameter of each sealing ring and the outer diameter of the corresponding spherical annular boss, so that the sealing rings are arranged in a floating type adjusting mode on the spherical boss. The two sealing rings are movably and detachably designed, so that the maintenance and the replacement are convenient. The inner diameter of the sealing ring and the outer diameter of the spherical annular boss are provided with a certain clearance K (the K value is not limited), the clearance K ensures that the sealing ring is floatably adjustable on the spherical boss, and the sealing ring can be adaptively adjusted at any time to be matched with the sealing surface of the valve seat. The floating type self-adaptive adjusting sealing ring can still keep the optimal sealing performance of the valve even under the condition of high-temperature thermal deformation, and the sealing pair cannot generate blocking, interference or locking phenomena. Specifically, k=2 to 4mm, and k= 0.5E3. And when the ball valve is fully opened to 90 degrees, Y1 is less than K and less than Y2. After the floating self-adaptive adjusting sealing ring is arranged in the way, even under the high-temperature deformation condition, the optimal sealing performance of the valve can be maintained, and the blocking, interference or locking phenomenon can not be generated between sealing pairs; in addition, when the valve is fully opened to 90 degrees, the sealing ring and the valve body seat are always in a separated and non-contact state, so that the opening and closing torque of the valve is very small, interference friction phenomenon is avoided between sealing pairs, friction torque is not generated between the sealing pairs, and abrasion is not generated. Therefore, leakage is not easy to occur even if the valve is used for a long time, and the service life of the valve is longer.

Realize the double-valve seat double-sealing function of the eccentric metal hard-sealing ball valve:

currently, all conventional types of multi-eccentric metal hard seal ball valves, eccentric half ball valves or C-ball valves because the valve shaft center has a radial eccentricity with respect to the valve body flow passage centerline that would result in all eccentric hard seal ball valves having a seal configuration and only one seal valve seat, i.e., a single seal configuration. Therefore, the conventional eccentric hard seal ball valve has no double-valve seat double-seal structure of the traditional central symmetry ball valve, and has the advantages of bidirectional equal-pressure seal and double-flow unrestricted installation.

The six-eccentric double-valve-seat metal hard sealing ball valve combines the respective advantages of the traditional central symmetry ball valve and the eccentric hard sealing ball valve, and also realizes the purposes of double-valve-seat double sealing, bidirectional isobaric sealing and double-flow-direction unlimited installation of the six-eccentric ball valve. Traditional centrosymmetric double-seat ball valves, whether soft or hard seal ball valves, rely on position sealing. In the whole opening and closing process of the valve, the valve seat and the ball body are always in an extrusion friction state, the friction moment of the valve is large, the sealing pair is easy to abrade, leakage is generated, and the service life of the valve is short. The six-eccentric double-valve seat metal hard sealing ball valve has the advantages that torque sealing is adopted between the sealing ring and the valve seat, and the torque sealing is basically different from the position sealing in the prior art. And the unique eccentric structure design is adopted, when the valve is opened, the sealing pair is separated, and when the valve is closed, the sealing pair is contacted. In the opening and closing process of the valve, the sealing ring and the valve body seat are always in a separated and non-contact state, interference friction phenomenon is avoided between sealing pairs, friction moment is avoided between the sealing pairs, and abrasion is avoided. Therefore, the opening and closing torque of the valve is small, the valve is not easy to leak, and the service life of the valve is longer. The six-eccentric double-valve seat metal hard sealing ball valve has the advantages that the two sealing pairs are overlapped and symmetrical after rotating 180 degrees along the center line of the valve shaft, so that under the action of double-flow-direction pressure of the valve, the switching torque of the valve is the same and extremely low no matter which pressure direction the medium is in. Compared with the traditional common ball valve, the six-eccentric double-valve seat metal hard sealing ball valve has the advantages that the sealing ring and the valve body seat are made of metal stainless steel and alloy steel, and can be used in various extremely harsh working condition environments such as high and low temperature, ultrahigh pressure, corrosion resistance, scouring resistance and the like. The six-eccentric double-valve seat metal hard sealing ball valve is characterized in that the sealing ring and the valve seat are fixed on the ball body and the side flange through screws, so that the sealing ring and the valve seat are of movable detachable structures. Even if the sealing ring and the valve seat are completely damaged, the parts can be disassembled, replaced or maintained and installed on site, and the new valve does not need to be returned to factories for maintenance or purchased again. The maintenance, the repair and the replacement of the valve are simple and convenient, the maintenance cost is low, and the service life of the valve is prolonged. The six-eccentric double-valve seat metal hard seal ball valve integrates all the advantages of the ball valve and the butterfly valve, abandons the novel multi-eccentric metal hard seal butterfly valve with the respective defects, and integrates the advantages of full circulation, double valve seats, double cutoff, low torque, no interference friction of a switch, self-adaptive sealing and zero leakage sealing of the ball valve.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. The utility model provides a six eccentric double valve seat metal hard seal ball valve, includes well valve body, side valve body, spheroid, seal assembly, disk seat, valve shaft, valve gap, gland, bottom and drive mechanism, the spheroid is connected with the valve shaft, and drive mechanism drives the valve shaft and rotates, the disk seat is installed in the side valve body, and the spheroid supports in the disk seat, its characterized in that: the valve is characterized in that a valve cavity is formed between the middle valve body and the side valve body, a ball is positioned in the valve cavity, the radiuses of the left hemisphere and the right hemisphere of the ball are the same but the centers of the balls are different, the sealing assembly comprises sealing rings, bosses are formed on the left hemisphere and the right hemisphere of the ball, the sealing rings are arranged on the bosses to enable the valve seat and the ball to be sealed, the sealing positions of the sealing rings and the valve seat are sealing ring sealing surfaces and valve seat sealing surfaces, the vertical distance between the center line of a valve shaft and the center of the plane of the opposite sealing ring forms a first eccentric distance E1, the distance between the center line of the shaft hole of the ball and the center line of the inner diameter of the sealing ring on the right side forms a second eccentric distance E2, and the distance between the center line of the inner diameter of the sealing ring on the left side and the center line of the inner diameter of the sealing ring on the right side forms a third eccentric distance E3;

when the ball valve is just opened, the sealing ring is separated from the valve seat, gaps X1 and X2 are respectively formed between the sealing ring sealing surface of the left hemisphere and the corresponding valve seat sealing surface, and gaps X2 and X1 are respectively formed between the sealing ring sealing surface of the right hemisphere and the corresponding valve seat sealing surface; when the ball valve is fully opened to 90 degrees, gaps Y1 and Y2 are respectively formed between the sealing ring of the left hemisphere and the corresponding two valve seats, and gaps Y2 and Y1 are respectively formed between the sealing ring of the right hemisphere and the corresponding two valve seats.

2. The six eccentric double seat metal hard seal ball valve of claim 1, wherein: the sealing surfaces of the valve seats corresponding to the left hemisphere and the right hemisphere are respectively a part of an oblique elliptical cone, and the triangular section where the conical top point of each oblique elliptical cone and the long axis of the elliptical bottom surface are co-located is coplanar with the central line of the valve flow passage and is perpendicular to the axis of the shaft hole of the sphere.

3. The six eccentric double seat metal hard seal ball valve of claim 2, wherein: the central lines of the two oblique elliptical cones are parallel, and the distance between the two is L, wherein L=2.5E3-3E3.

4. A six eccentric double seat metal hard seal ball valve according to claim 2 or 3, wherein: a fourth eccentric distance E4 is formed between the vertex of each oblique elliptical cone and the central line of the valve body flow passage, and an included angle between the central line of each oblique elliptical cone and the central line of the valve body flow passage forms an angle eccentric gamma.

5. The six eccentric double seat metal hard seal ball valve of claim 2, wherein: and the included angles alpha and beta between the upper sealing cone line and the lower sealing cone line are unequal to the included angles beta and beta between the upper sealing cone line and the lower sealing cone line, and the vertical line passing through any point on the cone central line on the cross section of the central line of each oblique elliptical cone and the intersection point of the upper sealing cone line and the lower sealing cone line in the cross section are equal to the upper distance and the lower distance between the vertical line and the intersection point of the central line of the oblique elliptical cone.

6. The six eccentric double seat metal hard seal ball valve of claim 1, wherein: the sealing rings are metal sealing rings, the two metal sealing rings are respectively connected and fixed on annular bosses on two sides of the sphere through screws and pressing rings, and gaps K are formed between the inner diameters of the sealing rings and the outer diameters of the corresponding spherical annular bosses, so that the sealing rings are arranged on the spherical bosses in a floating mode.

7. The six eccentric double seat metal hard seal ball valve according to claim 6, wherein: k=2 to 4mm, k= 0.5E3.

8. The six eccentric double seat metal hard seal ball valve according to claim 6 or 7, wherein: when the ball valve is fully opened to 90 degrees, Y1 is less than K and less than Y2.

9. The six eccentric double seat metal hard seal ball valve of claim 1, wherein: the diameter of the valve path is defined as D, e3=2e2, e1=0.5d+ (5-8) E3.

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