A high-sealing five-eccentric rotary valve and a processing method for its valve seat

Abstract

The present invention relates to a high-sealing five-eccentric rotary valve, comprising a valve body and a valve core, wherein the outer wall surface of the valve seat comprises a first step surface, a second step surface and a third step surface in a stepped manner in sequence; the first step surface abuts against the inner wall of the valve body pipeline; the second step surface is provided with a small stopper column with a right-angled triangle cross section protruding upward, and the inclined surface of the small stopper column faces the third step surface; the third step surface abuts against the inner wall surface of the groove portion, and the third step surface is provided with a fourth step surface abutting against the inner wall of the valve body pipeline, and a first sealing gasket is provided between the third step surface and the inner side wall of the groove portion; the inner corner of the valve seat facing the valve core is a conical surface; the groove portion comprises a serrated surface corresponding to the second step surface, and the serrated shape of the serrated surface is staggered with the small stopper column, a pressure plate is installed on the side of the groove portion close to the inlet, and a second sealing gasket is filled between the pressure plate and the second step surface; a flow block is provided on the inner wall of the valve seat. The device achieves the purpose of maintenance-free valve core and high sealing performance through an automatic compensation structure.

Description

Technical Field

[0001] The invention relates to the technical field of control pipeline equipment, and in particular to a high-sealing five-eccentric rotary valve and a processing method for a valve seat thereof. Background Art

[0002] Ball valves are mainly used to cut off, distribute and change the flow direction of the medium in pipelines, and are widely used in pipelines and control equipment. In the prior art, Chinese utility model patent CN113757407A discloses a five-eccentric hard-seal welded ball valve, including: a ball shell assembly in which the valve core and the valve body are integrally arranged, a valve seat and a connecting assembly connected to both ends of the shell, both ends of the valve core are provided with conical sealing rings, the upper and lower ends of the valve body are both provided with openings, and also include a valve stem and a fixed shaft that are circumferentially fixed and coaxially arranged with the upper and lower ends of the valve core respectively through the opening, and a flow hole is provided in the valve body, and the ball valve also includes a five-eccentric structure.

[0003] However, the ball valve in the patent has a complex structure and needs to be sealed with many other parts to assist in sealing during use. As the service life increases, other parts may fail uncontrollably and need to be replaced regularly, otherwise the seal may not be tight, which will affect the sealing effect, affect the use and cause safety accidents. In particular, as the ball valve is used for a longer time, the long-term friction between the valve core and the valve seat causes wear on the valve core sealing surface; and the valve core is damaged by the long-term impact of the medium, so that the valve core and the valve seat cannot be sealed and abutted, resulting in poor sealing performance. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a high-sealing five-eccentric rotary valve, which, through an automatic compensation structure, enables the valve core to achieve the purpose of maintenance-free and high sealing when wear occurs.

[0005] In order to achieve the above-mentioned purpose of the invention, the present invention provides a high-sealing five-eccentric rotary valve, comprising a valve body and a valve core rotatably arranged in the valve body, wherein a flow cavity is arranged in the valve body, an opening is arranged at the top of the valve body, and an inlet and an outlet are arranged on both sides for the medium to flow in or out respectively; a valve seat is provided at the inlet end of the valve body and is sealed and installed on the inner wall surface of the valve body, and a groove portion matching the outer wall surface of the valve seat is provided on the inner wall surface of the valve body corresponding to the position of the valve seat;

[0006] The valve seat comprises, in sequence, a first step surface, a second step surface and a third step surface which are arranged in a stepped shape on the outer wall surface from the inlet end to the side close to the valve core; the first step surface abuts against the inner wall of the valve body pipe; the second step surface is provided with a small limit column which protrudes upward and has a right-angled triangle cross section, and the triangular inclined surface of the small limit column faces the third step surface; the third step surface abuts against the inner wall surface of the groove portion, the third step surface is provided with a fourth step surface which abuts against the inner wall of the valve body pipe, and a first sealing gasket is provided between the third step surface and the inner side wall of the groove portion; the inner corner of the valve seat facing the valve core forms a conical surface which can abut against the surface of the valve core;

[0007] The groove portion includes an annular surface corresponding to the third step surface and a serrated surface corresponding to the second step surface. The serrated shape of the serrated surface is staggered with the small limit column. A pressure plate is installed on the side of the groove portion close to the inlet, and a second sealing gasket is filled between the side of the pressure plate and the second step surface; the inner wall of the valve seat close to the valve core is provided with a flow block extending toward the flow cavity and having a shape adapted to the closing surface of the valve core.

[0008] Furthermore, the triangular inclined surface of the small limit column is set at 5-10° to the central horizontal plane of the valve seat, and the cross-section of the serrated surface is a right-angled triangle structure. One right-angled side of the serrated surface is arranged on the inner wall surface of the groove portion, and the other right-angled side faces the third step surface; the triangular inclined side of the serrated surface cross-section is set at 3-8° to the central horizontal plane of the small limit column.

[0009] Furthermore, the number of serrations on the serrated surface is 2-10, and the number of the small limit columns is 1; an inner recess extending to the outside of the second step surface is provided below the small limit column of the valve seat corresponding to the second step surface, and the inner recess is filled with a third sealing gasket.

[0010] Furthermore, the baffle block is in the shape of a ring or a plurality of blocks evenly spaced apart; a plurality of small holes are distributed on the baffle block, and a strip-shaped reinforcing rib is provided on one side of the baffle block that deviates from the valve core.

[0011] Furthermore, the baffle block is a two fan-shaped structure arranged on opposite sides of the inner wall of the valve seat, and the two fan-shaped structures are arranged at the same horizontal plane position.

[0012] Furthermore, the diameter of the liquid inlet of the valve core is smaller than the diameter of the valve seat, and the free end portion of the baffle block toward the inside extends forward, so that the baffle block covers part of the liquid inlet of the valve core on a horizontal projection plane.

[0013] Furthermore, a concave depression is provided on the inner side of the conical surface.

[0014] Furthermore, a tubular base is installed at the outlet end of the valve body, and the inner side of the tubular base is provided with an abutting surface that abuts against the outer wall of the valve core, and the outer side of the tubular base is provided with a convex edge, and the convex edge is used to install the tubular base on the outlet end of the valve body by screws, and a fourth sealing gasket is provided at the abutment between the convex edge and the valve body.

[0015] Furthermore, the valve body is provided with an eccentric structure and a spherical structure, the spherical structure is provided with a first spherical surface, a second spherical surface, a third spherical surface and a fourth spherical surface, the radius of the first spherical surface is SR1, the radius of the second spherical surface is SR2, the radius of the third spherical surface is SR3, and the radius of the fourth spherical surface is SR4; the center of the first spherical surface, the center of the second spherical surface, the center of the third spherical surface and the center of the fourth spherical surface form a four-eccentric structure, SR1=SR3 and SR2=SR4; the center of the valve body and the center of the valve core are set to be eccentric to form a fifth eccentric structure.

[0016] The second aspect of the present invention discloses a method for processing a valve seat for the above-mentioned high-sealing five-eccentric rotary valve, comprising the following steps:

[0017] Cutting the raw material bar into suitable segments according to the length required during processing;

[0018] Heating the raw material bar;

[0019] The raw material bar is formed into a valve seat blank by stamping, and the two ends of the valve seat blank are processed to form a flat portion and an outer end face chamfer; the valve seat blank is further processed to form at least one connecting pipe portion, and the connecting pipe portion passes through the upper and lower surfaces of the valve seat blank, and the outer corner of the connecting pipe portion is processed to form an inner end face chamfer; the outer side of the inner end face of the valve seat blank is continuously placed into a stamping die for stamping, so that the diameter of the connecting pipe portion outside the inner end face is larger than the diameter of the connecting pipe portion inside the inner end face;

[0020] The flash of the valve seat blank is cut off by mechanical cutting or punching to form a valve seat semi-finished product; the outer end surfaces of both sides of the valve seat semi-finished product are chamfered to form a first step surface and a fourth step surface, and the inner side of the inner end surface of the valve seat semi-finished product is formed into a conical surface and a baffle block;

[0021] Continue to use mechanical cutting or punching to cut off the flash of the semi-finished valve seat to form a rough valve seat; the outer end surface of the rough valve seat forms a second step surface and a third step surface, a small limit column with a right-angled triangle structure is formed on the second step surface, and a recessed portion is cut below the small limit column corresponding to the second step surface; the baffle block is cut into a setting shape and a small hole is cut;

[0022] Processing each end surface and recessed portion of the rough finished valve seat by broaching, grinding or electrochemical method;

[0023] Hot-melt rubber sealing material is poured into the recessed portion, and the surface is cut and leveled after the temperature drops to room temperature.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The high-sealing five-eccentric rotary valve of the present invention has the ability to self-compensate for damage to the valve core surface through a unique valve seat structure; the baffle block structure of the valve seat serves as a power plate for the movement of the valve seat, and the medium impacts the baffle block, the valve body moves slightly and is limited by the chamfered clamping of the small limit column and the serrated surface, so that it drives the valve seat to always fit the closed surface of the valve core, automatically realizing compensation for the wear of the outer surface of the valve core; it realizes that when the valve core is worn, the stable sealing performance of the rotary valve is always maintained. The device does not need manual adjustment and can automatically realize sealing compensation through medium impact.

[0026] The arrangement of the pressure plate and the sealing gasket structure of the valve seat of the present invention not only realizes the sealing performance of the valve body, but also makes the installation and maintenance operations simple; when the valve core needs to be replaced and the valve seat needs to be adjusted, the pressure plate can be removed for operation.

[0027] In addition, the processing method provided by the present invention enables the improved valve seat blank to be integrally processed and formed, ensuring that the valve seat with the baffle block structure is simple to process and relatively guaranteed in terms of accuracy. In addition, the sealing gasket material of the recessed part is placed by pouring, which simplifies the installation method and ensures that the sealing gasket is completely filled into the narrow recessed part, making the operation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0029] Figure 1 It is an overall cross-sectional view of the high-sealing five-eccentric rotary valve of the present invention;

[0030] Figure 2 for Figure 1 A magnified structural diagram of part A;

[0031] Figure 3 Schematic diagrams of various forms of the baffle block of the present invention;

[0032] Figure 4 A schematic diagram of an embodiment of a baffle block of the present invention;

[0033] Figure 5 The figure is a schematic diagram of the eccentric structure of the high-sealing five-eccentric rotary valve of the present invention in a longitudinal section. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] like Figure 1-2 As shown, the embodiment provides a high sealing five-eccentric rotary valve, comprising a valve body 1 and a valve core 2 rotatably arranged in the valve body 1, wherein a flow cavity 3 is arranged in the valve body 1, an opening 10 is arranged at the top of the valve body 1, and an inlet 11 and an outlet 12 are arranged on both sides for the medium to flow in or out, respectively, and a valve stem 9 is installed on the opening 10 to connect with the valve core 2. The outer side of the inlet 11 and the outer side of the outlet 12 can be connected with the pipes on both sides through bolts, nuts and gaskets.

[0037] The inlet end 11 of the valve body 1 is provided with a valve seat 4 which is sealingly mounted on the inner wall surface of the valve body 1, and the inner wall surface of the valve body 1 corresponding to the position of the valve seat 4 is provided with a groove portion which cooperates with the outer wall surface of the valve seat 4; the valve seat 4 sequentially includes a first step surface 40, a second step surface 41 and a third step surface 42 which are arranged on the outer wall surface from the inlet end to the side close to the valve core 2 in a stepped manner; the first step surface 40 abuts against the inner wall of the pipe of the valve body 1; the second step surface 41 is provided with a small limit column 44 which protrudes upward and has a right-angled triangle cross section, and the triangular inclined surface of the small limit column 44 faces the third step surface 42; the third step surface 42 abuts against the inner wall surface of the groove portion, and the third step surface 42 is provided with a fourth step surface 43 which abuts against the inner wall of the pipe of the valve body 1, and a first sealing gasket 6 is provided between the third step surface 42 and the inner side wall of the groove portion; the sealing gasket is made of elastic rubber material, so that the valve seat can move slightly in the same direction of the flow under the impact force of the high-speed medium. The inner corner of the valve seat 4 facing the valve core 2 forms a tapered surface 45 that can contact the surface of the valve core 2 .

[0038] The groove portion includes an annular surface corresponding to the third step surface 42 and a serrated surface 16 corresponding to the second step surface 41. The serrated shape of the serrated surface 16 is staggered with the small limit column 44. A pressure plate 17 is installed on the side of the groove portion close to the inlet. A second sealing gasket 60 is filled between the side of the pressure plate 17 and the second step surface 41. A baffle block 7 extending toward the flow cavity and having a shape adapted to the closed surface of the valve core 2 is provided on the inner wall of the valve seat 4 close to the valve core 2. The baffle block 7 serves as a power plate for the movement of the valve seat. When the medium impacts the baffle block, the valve body moves slightly and is limited by the chamfering of the serrated surface, so that it drives the valve seat to always fit the closed surface of the valve core, automatically realizing compensation for the wear of the outer surface of the valve core.

[0039] The triangular slope of the small limit post 44 is set at 5-10° to the central horizontal plane of the valve seat 4, and the cross section of the serrated surface 16 is a right-angled triangle structure. One right-angled side of the serrated surface 16 is set on the inner wall surface of the groove portion, and the other right-angled side faces the third step surface 42; the triangular slope of the cross section of the serrated surface 16 is set at 3-8° to the central horizontal plane of the small limit post 44. The serrations of the small limit post 44 and the serrated surface 16 are engaged with each other to clamp the valve seat after a slight movement to prevent the valve seat from moving in the opposite direction. The specific number of the serrated surface and the small limit post can be set according to actual conditions. In one example, the number of serrations on the serrated surface 16 is 2-10, and the number of the small limit posts 44 is 1-3. A recessed portion 47 extending to the outside of the second step surface 41 is provided below the small limit column 44 of the valve seat 4 corresponding to the second step surface 41, and the recessed portion 47 is filled with a third sealing gasket 61; the third sealing gasket allows the small limit column to perform a slight elastic movement in the longitudinal direction, thereby reducing the friction between the small limit column and the serrations of the serrated surface during movement to achieve automatic compensation.

[0040] The baffle block 7 can be set in various forms under the premise of ensuring the flow rate of the medium. The baffle block 7 is in the shape of a ring or a plurality of blocks evenly spaced. Figure 3 a, 3b, 3c; the baffle block 7 also has a decompression effect to avoid damage to the valve core due to excessive medium impact force, especially to solve the problem of severe damage caused by excessive instantaneous water flow at the valve body when the valve core is closed in an emergency; the baffle block 7 is distributed with a plurality of small holes 70, see Figure 4 , while reducing pressure, ensuring the passage of the medium, avoiding excessive flow resistance due to the block being too large. In addition, the block 7 is provided with a strip-shaped reinforcing rib 71 on the side away from the valve core 2 to improve the strength and service life of the block.

[0041] In a specific example, Figure 3As shown in b, the baffle block 7 is two fan-shaped structures arranged on opposite sides of the inner wall of the valve seat 4, and the two fan-shaped structures are arranged at the same horizontal plane position. This structure corresponds to the direction of the core body when the valve core is switched, which can effectively prevent the valve core from being seriously damaged by excessive instantaneous water flow at the valve body when the valve core is closed in an emergency.

[0042] The diameter of the liquid inlet of the valve core 2 is smaller than the diameter of the valve seat 4, and the free end portion of the baffle block 7 toward the inside extends forward, so that the baffle block 7 covers part of the liquid inlet of the valve core 2 on the horizontal projection plane. The baffle block and the valve seat are all made of a full metal hard seal structure, and the valve body is made of an integrated structure milled from F304+STL material. The conical surface of the valve seat sealing surface is strictly matched and ground with the sealing surface of the valve core. The baffle block and the valve body are made of the same strong hardness material. In order to avoid deformation caused by an excessively large resistance surface, the small hole setting of the baffle block is particularly critical; at the same time, the free end of the baffle block extends beyond the corresponding part of the valve core opening by no more than 1 / 2 of the depth of the baffle block itself.

[0043] Figure 1 As shown, a concave recess 48 is provided inside the conical surface 42; when the valve core is flowing, the recess 48 just corresponds to the edge of the opening, so as to receive the waste powder generated by the friction between the sealing surface of the valve core and the conical surface of the valve seat.

[0044] A tubular base 8 is installed at the outlet end of the valve body 1, and an abutting surface 80 is provided on the inner side of the tubular base 8 to abut against the outer wall surface of the valve core 2, and a convex edge 81 is provided on the outer side of the tubular base 8. The convex edge 81 is used to install the tubular base 8 at the outlet end of the valve body 1 by screws, and a fourth sealing gasket 62 is provided at the abutment between the convex edge 81 and the valve body 1. The structure of this end ensures that the tubular base has a certain fine-tuning space.

[0045] Figure 5 As shown, the valve body 1 is provided with an eccentric structure and a spherical structure. The spherical structure includes a first spherical surface S1, a second spherical surface S2, a third spherical surface S3 and a fourth spherical surface S4. The radius of the first spherical surface S1 is SR1, the radius of the second spherical surface S2 is SR2, the radius of the third spherical surface S3 is SR3, and the radius of the fourth spherical surface S4 is SR4; the center W of the first spherical surface S1, the center X of the second spherical surface S2, the center Y of the third spherical surface S3 and the center Z of the fourth spherical surface S4 form a four-eccentric structure. Among them, further SR1=SR3 and SR2=SR4. Among them, the center of the valve body and the center of the valve core are provided with an eccentric G to form a fifth eccentric structure. In the five-eccentric structure, the center line formed by the valve stem and the connecting port and the center of the inner flow hole of the valve body are provided with a transverse eccentric structure to ensure the eccentric angle and eccentric distance with the valve core. At the same time, the transverse eccentric distance can also ensure that the valve core will not be over-positioned during the switching process, so that the valve core 2 has a self-limiting function during the switching process.

[0046] Example 2

[0047] The second embodiment of the present invention discloses a method for processing a valve seat for the above-mentioned high-sealing five-eccentric rotary valve, comprising the following steps:

[0048] Cutting the raw material bar into suitable segments according to the length required during processing;

[0049] Heating the raw material bar;

[0050] The raw material bar is formed into a valve seat blank by stamping, and the two ends of the valve seat blank are processed to form a flat portion and an outer end face chamfer; the valve seat blank is further processed to form at least one connecting pipe portion, and the connecting pipe portion passes through the upper and lower surfaces of the valve seat blank, and the outer corner of the connecting pipe portion is processed to form an inner end face chamfer; the outer side of the inner end face of the valve seat blank is continuously placed into a stamping die for stamping, so that the diameter of the connecting pipe portion outside the inner end face is larger than the diameter of the connecting pipe portion inside the inner end face;

[0051] The flash of the valve seat blank is cut off by mechanical cutting or punching to form a valve seat semi-finished product; the outer end surfaces of both sides of the valve seat semi-finished product are chamfered to form a first step surface and a fourth step surface, and the inner side of the inner end surface of the valve seat semi-finished product is formed into a conical surface and a baffle block;

[0052] Continue to use mechanical cutting or punching to cut off the flash of the semi-finished valve seat to form a rough valve seat; the outer end surface of the rough valve seat forms a second step surface and a third step surface, a small limit column with a right-angled triangle structure is formed on the second step surface, and a recessed portion is cut below the small limit column corresponding to the second step surface; the baffle block is cut into a setting shape and a small hole is cut;

[0053] Processing each end surface and recessed portion of the rough finished valve seat by broaching, grinding or electrochemical method;

[0054] Hot-melt rubber sealing material is poured into the recessed portion, and the surface is cut and leveled after the temperature drops to room temperature.

[0055] This method optimizes and improves the existing valve seat processing method according to the specific structure of the valve body. After preparing the raw material continuous casting copper bar and the heating step, the valve seat blank is directly processed and formed in one piece by multi-level stamping, making the processing more convenient and the accuracy relatively guaranteed. In addition, the sealing gasket material of the recessed part is placed by pouring, which simplifies the installation method and ensures that the sealing gasket is completely filled into the narrow recessed part, making the operation more convenient.

[0056] The preferred specific implementation modes and embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes and embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the concept of the present invention.

Claims

1. A high-sealing five-eccentric rotary valve, comprising a valve body and a rotatable valve core arranged in the valve body, wherein a flow cavity is arranged in the valve body, an opening is arranged at the top of the valve body, and an inlet and an outlet are arranged on both sides for the medium to flow in or out respectively; characterized in that: The inlet end of the valve body is provided with a valve seat which is sealingly mounted on the inner wall surface of the valve body, and the inner wall surface of the valve body corresponding to the position of the valve seat is provided with a groove portion which matches the outer wall surface of the valve seat; The valve seat comprises, in sequence, a first step surface, a second step surface and a third step surface which are arranged on the outer wall surface from the inlet end to the side close to the valve core in a stepped shape; the first step surface abuts against the inner wall of the valve body pipe; the second step surface is provided with a small stopper column with a right-angled triangle cross section protruding upward, and the triangular slope of the small stopper column faces the third step surface; the third step surface abuts against the inner wall surface of the groove portion, the third step surface is provided with a fourth step surface abutting against the inner wall of the valve body pipe, and a first sealing gasket is provided between the third step surface and the inner side wall of the groove portion; the inner corner of the valve seat facing the valve core forms a conical surface which can abut against the surface of the valve core, and a concave recessed portion is provided on the inner side of the conical surface, the triangular slope of the small stopper column is set at 5-10° with the central horizontal plane of the valve seat, the cross section of the sawtooth surface is a right-angled triangle structure, a right-angled side of the sawtooth surface is set on the inner wall surface of the groove portion, and the other right-angled side faces the third step surface; the triangular hypotenuse of the cross section of the sawtooth surface is set at 3-8° with the central horizontal plane of the small stopper column; The groove portion includes an annular surface corresponding to the third step surface and a serrated surface corresponding to the second step surface, the serrated shape of the serrated surface is staggered with the small limit column, a pressure plate is installed on the side of the groove portion close to the inlet, and a second sealing gasket is filled between the side of the pressure plate and the second step surface; a baffle block extending toward the flow cavity and having a shape adapted to the closed surface of the valve core is provided on the side of the inner wall of the valve seat close to the valve core, and the baffle block is annular or a plurality of blocks evenly spaced; a plurality of small holes are distributed on the baffle block, and a strip-shaped reinforcing rib is provided on the side of the baffle block deviating from the valve core, and the baffle block is a two fan-shaped structure arranged on the opposite sides of the inner wall of the valve seat, and the two fan-shaped structures are arranged at the same horizontal plane position, the diameter of the liquid inlet of the valve core is smaller than the diameter of the valve seat, and the free end portion of the baffle block toward the inside extends forward, so that the baffle block covers part of the liquid inlet of the valve core on the horizontal projection plane.

2. The high sealing five-eccentric rotary valve according to claim 1, characterized in that: The number of serrations on the serrated surface is 2-10, and the number of the small limit columns is 1; a recessed portion extending to the outside of the second step surface is provided below the small limit column of the valve seat corresponding to the second step surface, and the recessed portion is filled with a third sealing gasket.

3. The high sealing five-eccentric rotary valve according to claim 1, characterized in that: A tubular base is installed at the outlet end of the valve body, and a contact surface abutting against the outer wall of the valve core is provided on the inner side of the tubular base. A convex edge is provided on the outer side of the tubular base, and the tubular base is installed on the outlet end of the valve body by screws. A fourth sealing gasket is provided at the abutment between the convex edge and the valve body.

4. The high sealing five-eccentric rotary valve according to claim 1, characterized in that: The valve body is provided with an eccentric structure and a spherical structure. The spherical structure is provided with a first spherical surface, a second spherical surface, a third spherical surface and a fourth spherical surface. The radius of the first spherical surface is SR1, the radius of the second spherical surface is SR2, the radius of the third spherical surface is SR3, and the radius of the fourth spherical surface is SR4. The center of the first spherical surface, the center of the second spherical surface, the center of the third spherical surface and the center of the fourth spherical surface form a four-eccentric structure, wherein SR1=SR3 and SR2=SR4. The center of the valve body and the center of the valve core are set to be eccentric to form a fifth eccentric structure.

5. A method for processing a valve seat of a high-sealing five-eccentric rotary valve according to claim 1, characterized in that: The steps include: Cut the raw material bars into suitable segments according to the length required during processing; Heating the raw material bar; The raw material bar is formed into a valve seat blank by stamping, and the two ends of the valve seat blank are processed to form a flat portion and an outer end face chamfer; the valve seat blank is further processed to form at least one connecting pipe portion, and the connecting pipe portion passes through the upper and lower surfaces of the valve seat blank, and the outer corner of the connecting pipe portion is processed to form an inner end face chamfer; the outer side of the inner end face of the valve seat blank is continuously placed into a stamping die for stamping, so that the diameter of the connecting pipe portion outside the inner end face is larger than the diameter of the connecting pipe portion inside the inner end face; The flash of the valve seat blank is cut off by mechanical cutting or punching to form a valve seat semi-finished product; the outer end surfaces of both sides of the valve seat semi-finished product are chamfered to form a first step surface and a fourth step surface, and the inner side of the inner end surface of the valve seat semi-finished product is formed into a conical surface and a baffle block; Continue to use mechanical cutting or punching to cut off the flash of the semi-finished valve seat to form a rough valve seat; the outer end surface of the rough valve seat forms a second step surface and a third step surface, a small limit column with a right-angled triangle structure is formed on the second step surface, and a recessed portion is cut below the small limit column corresponding to the second step surface; the baffle block is cut into a setting shape and a small hole is cut; Processing each end surface and recessed portion of the rough finished valve seat by broaching, grinding or electrochemical method; Hot-melt rubber sealing material is poured into the recessed portion, and the surface is cut and leveled after the temperature drops to room temperature.

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