Valve seat assembly and fixed ball valve adopting same

Abstract

The utility model relates to the technical field of valve seats, in particular to a valve seat assembly and a fixed ball valve with the valve seat assembly. The valve seat assembly comprises a spring abutting against the valve body, and the end, away from the valve body, of the spring is connected with a spring seat. The side, close to the ball, of the spring seat abuts against a screw hole seat. The screw hole seat surrounds the outer peripheral surface of the valve seat, and matched threads are arranged on the inner peripheral surface of the screw hole seat and the outer peripheral surface of the valve seat; a smooth surface is further arranged on the peripheral surface of the valve seat; the inner circumferential surface of the spring seat is opposite to the threaded surface and / or the smooth surface; a first groove is formed in the sealing face, opposite to the arc face of the ball body, of the valve seat, a sealing part in interference fit is arranged in the first groove, the width of the outer circumferential face of the sealing part is matched with that of the outer circumferential face of the first groove, and the width of the inner circumferential face of the sealing part is larger than that of the inner circumferential face of the first groove. The sealing face of the sealing part forms an inclined face matched with the arc face of the ball body, sealing contact is formed, the spring is compressed by screwing the screw hole base, the sealing effect is improved, and replacement of the sealing part is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valve seats, in particular to a valve seat component and a fixed ball valve using the component. Background Art

[0002] In the prior art, the valve seat of the fixed ball valve uses a spring that applies a preload and / or the pressure of the medium to press the sealing part against the ball to achieve a sealing effect. Since the sealing part and the ball are in contact, during the long-term use of the fixed ball valve, the ball will experience friction and vibration with the sealing part during rotation, causing the sealing part to wear and / or accelerate aging, resulting in a gradual decrease in its sealing performance, and thus requiring multiple replacements. However, the replacement of the sealing part requires the removal of the ball, which is time-consuming; and during the multiple replacements, the probability of damage to other parts of the valve seat increases; and the multiple replacements of the sealing part also increase labor and material costs.

[0003] Therefore, how to reduce the number of replacement times of the sealing part and increase the service life of a single sealing part is a technical problem that needs to be solved urgently in the prior art. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problem in the prior art that the sealing part of the valve seat needs to be replaced frequently due to wear and / or aging. Through the embodiments of the present application, a valve seat assembly and a fixed ball valve using the assembly are provided, which achieves the technical effect of reducing the number of times the ball valve seat is replaced and performing online maintenance on the valve seat.

[0005] In order to achieve the above-mentioned utility model purpose, the utility model provides the following technical solutions:

[0006] A valve seat assembly comprises: a spring, the spring abuts against a valve body, one end of the spring away from the valve body is connected to a spring seat; the side of the spring seat close to a ball abuts against a screw hole seat;

[0007] The screw hole seat surrounds the outer circumference of the valve seat, and the inner circumference of the screw hole seat and the outer circumference of the valve seat are provided with matching threads; the outer circumference of the valve seat is also provided with a smooth surface; the inner circumference of the spring seat is opposite to the threaded surface and / or the smooth surface of the valve seat;

[0008] A first groove is provided on the sealing surface of the valve seat opposite to the arc surface of the sphere, and a sealing portion with an interference fit is provided in the first groove. The width of the outer circumference of the sealing portion is matched with the width of the outer circumference of the first groove, and the width of the inner circumference of the sealing portion is greater than the width of the inner circumference of the first groove, so that the sealing surface of the sealing portion forms an inclined surface matched with the arc surface of the sphere to form a sealing contact.

[0009] As a further implementation manner, the first groove is arranged along the axial direction of the valve seat.

[0010] As a further implementation manner, chamfers are arranged on the inner peripheral surface of the sealing portion and the side surface of the sealing portion facing the first groove.

[0011] As a preferred technical solution, a second groove is arranged on the inner peripheral surface of the valve seat, and the second groove is used for positioning of the assembly tooling.

[0012] As a further implementation manner, a plurality of the second grooves are symmetrically arranged in the same vertical plane, and the plurality of second grooves surround the inner peripheral surface of the valve seat in a circle.

[0013] As a further implementation manner, the second groove is arranged as an annular groove and surrounds the inner peripheral surface of the valve seat in a circle.

[0014] As a further implementation manner, the radius of the outer peripheral surface of the threaded seat is less than or equal to the radius of the outer peripheral surface of the spring seat.

[0015] As a further implementation manner, the radius of the threaded surface of the valve seat is greater than the radius of the smooth surface, so that the threaded surface and the smooth surface form a first step.

[0016] As a preferred technical solution, a second gap is reserved between the outer peripheral surface of the spring seat and the valve body; a first gap is reserved between the inner peripheral surface of the spring seat and the valve seat; the second gap and the first gap are communicated through the space where the spring is located.

[0017] As a preferred technical solution, the height of the side surface of the sealing portion facing the first groove is less than the height inside the first groove.

[0018] As a preferred technical solution, pin holes are arranged on the threaded surface of the valve seat close to the sphere.

[0019] As a preferred technical solution, a plurality of the pin holes are arranged.

[0020] As a preferred technical solution, the bottom of the pin hole is conical.

[0021] As a preferred technical solution, the valve seat is further provided with at least one third step; a limiting component is arranged between the fourth step surface of the third step and the valve body, and the limiting component is opposite to the third connecting surface of the third step; a piston cavity is formed among the limiting component, the third step and the valve body.

[0022] As a preferred technical solution, at least one elastic member is arranged in the piston cavity.

[0023] The present application provides a fixed ball valve, including the valve seat assembly, and further including: the valve body, the left and right inner sides of the valve body are respectively abutted against the valve seat assembly, the sealing portion of the valve seat assembly is abutted against the arc surface of the ball, and the upper end of the ball is connected to a valve stem passing through the opening of the valve body and the valve cover.

[0024] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0025] 1. After the sealing effect is reduced due to aging and / or wear of the sealing portion, the screw hole seat is screwed tightly in a direction away from the ball. The screw hole seat and the abutted spring seat move towards the valve body at the same time, so that the spring is further compressed, increasing the pre-tightening force of the spring; the pre-tightening force of the spring acts on the sealing portion of the valve seat through the spring seat, the screw hole seat and the valve seat threadedly connected to the screw hole seat, so that the sealing between the sealing portion and the ball is continuously maintained, reducing the replacement of the sealing portion.

[0026] 2. After the sealing effect is reduced due to aging and / or wear of the sealing portion, on the premise of keeping the position of the screw hole seat unchanged, by the cooperation of the plug rod and the plug hole, the plug rod is pulled to make the valve seat move towards the ball, so that the sealing portion and the ball are in sealing contact, and on-line maintenance of the valve seat can be realized. At the same time, the screw hole seat can also be screwed tightly in a direction away from the ball, so that the spring is compressed, increasing the pre-tightening force of the spring, and further increasing the sealing effect between the sealing portion and the ball.

[0027] 3. The second groove can also be used as a positioning groove for the assembly tool used when installing the ball valve. The assembly tool is installed at the opening where the medium of the ball valve flows, and the auxiliary guiding device is snapped into the positioning groove. Along the axial direction of the ball valve, the valve seat is pulled in a direction away from the ball, so that the distance between the left body and the right body of the valve seat is increased until the distance is greater than the diameter of the ball in the axial direction of the ball valve, and then the ball is installed or disassembled. The symmetrically arranged second grooves are beneficial to the balanced force of the valve seat during movement, making the axial movement distances of the valve seat equal, reducing the offset of the valve seat due to uneven force in the axial direction during assembly, effectively reducing the assembly difficulty, reducing the risk of damaging the sealing surface of the valve seat assembly, and improving the assembly quality.

[0028] 4. Before pulling the valve seat, the screw hole seat can also be screwed out towards the ball, so that the abutted spring seat also moves towards the ball, and the pre-tightening force of the spring is released, which is beneficial to the assembly tool to pull the valve seat.

[0029] 5. When assembling the sphere through the assembly tooling, the plug rod can also be first actuated through the cooperation between the plug rod and the plug hole, so that the valve seat moves away from the sphere until the plug rod contacts the threaded hole seat. Then, the valve seat is pulled away from the sphere through the assembly tooling, so that the distance between the left body and the right body of the valve seat is increased until the distance is greater than the diameter of the sphere in the axial direction of the ball valve, and then the sphere is installed or disassembled. This method is conducive to reducing the distance that the assembly tooling pulls the valve seat, further reducing the assembly difficulty, reducing the risk of damaging the sealing surface of the valve seat assembly, and improving the assembly quality. Description of the Drawings

[0030] Figure 1 Structural schematic diagram of the fixed ball valve provided by the present application;

[0031] Figure 2 is Figure 1 Structural schematic diagram of the valve seat assembly at position C in

[0032] Figure 3 Structural schematic diagram of the valve seat assembly provided with a plug hole;

[0033] Figure 4 is Figure 3 Partial enlarged view at position A in

[0034] Figure 5 is Figure 3 Partial enlarged view at position B in

[0035] Reference numerals: 1 - spring, 2 - spring seat, 3 - threaded hole seat, 4 - valve seat, 41 - threaded surface, 411 - first step, 412 - first connection surface, 42 - smooth surface, 43 - first groove, 44 - second groove, 5 - sealing part, 6 - valve body, 61 - second step, 611 - second connection surface, 612 - second step surface, 7 - sphere, 8 - second gap, 9 - first gap, 10 - cavity, 11 - plug hole, 12 - third step, 121 - third step surface, 122 - fourth step surface, 123 - third connection surface, 13 - third gap, 14 - limiting component, 15 - fourth gap, 16 - fourth step, 161 - fourth connection surface, 17 - elastic member. Detailed Embodiments

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model.

[0037] Accordingly, the following detailed description of the embodiments of the present utility model is not intended to limit the scope of the claimed present utility model, but merely represents some embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0038] It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments may be combined with each other.

[0039] It should be noted that like reference numerals and letters indicate similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the product of the present utility model is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0041] Embodiment 1: For example Figures 1 - 5 As shown, a valve seat assembly provided in this embodiment, for example Figure 1 at C and Figure 2 as shown, includes: a spring 1, the spring 1 abuts against the valve body 6, and one end of the spring 1 away from the valve body 6 is connected to a spring seat 2; the spring seat 2 abuts against a screw hole seat 3 on the side close to the sphere 7.

[0042] The screw hole seat 3 surrounds the outer peripheral surface of the valve seat 4, and the inner peripheral surface of the screw hole seat 3 and the outer peripheral surface of the valve seat 4 are provided with matching threads. By tightening or loosening the screw hole seat 3, the screw hole seat 3 and the spring seat 2 are simultaneously moved closer to or farther away from the valve body 6, realizing the compression or elongation of the spring 1.

[0043] The valve seat 4 includes a left body and a right body, which are respectively arranged on the left inner side and the right inner side of the valve body 6. The left body and the right body can be symmetrically arranged or asymmetrically arranged according to actual needs, and this embodiment does not make specific limitations.

[0044] The outer peripheral surface of the valve seat 4 is also provided with a smooth surface 42. The inner peripheral surface of the spring seat 2 faces the threaded surface 41 and / or the smooth surface 42 of the valve seat 4, and a first gap 9 is reserved, so that a cavity 10 is formed among the spring seat 2, the valve body 6 and the valve seat 4. After the pipeline medium enters the cavity 10, the medium pressure is applied to the first connection surface 412 of the first step 411, so that the valve seat 4 presses the sealing part 5.

[0045] One side of the valve seat 4 relative to the arc surface of the sphere 7 is set as a sealing surface, and a first groove 43 is arranged on the sealing surface. The first groove 43 is an annular groove. An interference-fitted sealing part 5 is arranged in the first groove 43. The width of the outer peripheral surface of the sealing part 5 is adapted to the width of the outer peripheral surface of the first groove 43, and the width of the inner peripheral surface of the sealing part 5 is greater than the width of the inner peripheral surface of the first groove 43, so that the sealing surface of the sealing part 5 forms an inclined surface adapted to the arc surface of the sphere 7. The two opposite inclined surfaces form a sealing contact under the action of the pre-tightening force of the spring 1 and the medium pressure.

[0046] As a further implementation manner, the first groove 43 is arranged along the axial direction of the valve seat 4, so that the sealing part 5 can be horizontally installed into the first groove 43.

[0047] As a further implementation manner, chamfers are arranged on the side surface of the sealing part 5 facing the first groove 43 and the inner peripheral surface of the sealing part 5, and / or chamfers are arranged on the side surface of the sealing part 5 facing the first groove 43 and the outer peripheral surface of the sealing part 5, so that the height of the side surface is less than the height inside the first groove 43, which is beneficial to improving the installation efficiency.

[0048] After the sealing effect of the sealing part 5 is reduced due to aging and / or wear, the screw hole seat 3 is screwed tightly in the direction away from the sphere 7. The screw hole seat 3 and the abutted spring seat 2 move towards the valve body 6 at the same time, so that the spring 1 is further compressed, and the pre-tightening force of the spring 1 is increased; the pre-tightening force of the spring 1 acts on the sealing part 5 of the valve seat 4 through the spring seat 2, the screw hole seat 3 and the valve seat 4 threadedly connected with the screw hole seat 3, so that the sealing part 5 and the sphere 7 are sealed.

[0049] Preferably, the spring 1 is fixedly connected with the spring seat 2, so that the spring seat 2 reduces the radial displacement.

[0050] Preferably, on the basis of the above method, a plurality of springs 1 are provided, and the distances from the axis lines of all the springs 1 to the axis line of the spring seat 2 are equal, so that the moments of the pre-tightening forces of all the springs 1 acting on the spring seat 2 are equal, reducing the probability of generating stress inside the spring seat 2. All the springs 1 form a spring annulus.

[0051] Preferably, on the basis of the above method, the radius of the outer peripheral surface of the screw hole seat 3 is less than or equal to the radius of the outer peripheral surface of the spring seat 2; the radius of the outer peripheral surface of the screw hole seat 3 is greater than or equal to the radius of the outer peripheral surface of the spring annulus, so that the acting force applied by the screw hole seat 3 to the spring seat 2 can be evenly distributed to the springs 1, reducing the different distances of compression or elongation of the springs 1 due to uneven force, reducing the probability of generating stress inside the spring seat 2, and improving the service life of the spring seat 2.

[0052] As a preferred embodiment, the smooth surface 42 is located between the threaded surface 41 and the valve body 6.

[0053] Preferably, on the basis of the above method, the radius of the threaded surface 41 of the valve seat 4 is greater than the radius of the smooth surface 42, so that the threaded surface 41 and the smooth surface 42 form a first step 411. The valve body 6 is provided with a second step 61 adapted to the first step 411, and the second step 61 is provided with a chamfer to reduce the wear generated during the movement of the valve seat 4. Further, the radius of the threaded surface 41 is less than the radius of the inner peripheral surface of the spring annulus, so that when the valve seat 4 is screwed into the valve body 6 in the axial direction, the first connection surface 412 can contact the second connection surface 611 of the second step 61, increasing the distance between the left body and the right body of the valve seat 4, which is beneficial to the installation of the sphere 7. The valve seat 4 realizes the movement of the valve body 6 in the axial direction through screw rotation, and realizes the stop of the valve seat 4 through the cooperation of the first step 411 and the second step 61.

[0054] As a preferred technical solution, a second groove 44 is provided on the inner peripheral surface of the valve seat 4, and the second groove 44 is used for the positioning of the assembly tooling. When installing or disassembling the fixed ball valve provided in the present application, the second groove 44 can be used as a positioning groove for installing an auxiliary guiding device in the assembly process of the tooling.

[0055] Preferably, on the basis of the above method, a plurality of the second grooves 44 are symmetrically provided in the same vertical plane, and the plurality of second grooves 44 surround the inner peripheral surface of the valve seat 4 in a circle.

[0056] As a preferred embodiment, the second groove 44 is provided as an annular groove, surrounding the inner peripheral surface of the valve seat 4 in a circle.

[0057] The second groove can also be used as a positioning groove for the assembly tooling used during the installation of the ball valve. The assembly tooling is installed at the opening where the medium of the ball valve flows. The auxiliary guiding device is snapped into the positioning groove, and along the axial direction of the ball valve, the valve seat is pulled away from the sphere, so that the distance between the left body and the right body of the valve seat is increased. After the distance is greater than the diameter of the sphere in the axial direction of the ball valve, the sphere is installed or disassembled. The symmetrically arranged second grooves are conducive to the balanced force of the valve seat during movement, making the axial movement distances of the valve seat equal, reducing the offset of the valve seat during assembly due to uneven force in the axial direction, effectively reducing the assembly difficulty, reducing the risk of damaging the sealing surface of the valve seat assembly, and improving the assembly quality. Before pulling the valve seat, the screw hole seat can also be screwed out towards the sphere, so that the abutting spring seat also moves towards the sphere, and the pre-tightening force of the spring is released, which is conducive to the assembly tooling pulling the valve seat.

[0058] In addition, when multiple second grooves are provided, after the auxiliary guiding device of the assembly tooling is snapped into the positioning groove, the valve seat can also be rotated to move the valve seat away from the sphere, which can also increase the distance between the left body and the right body of the valve seat. After the distance is greater than the diameter of the sphere in the axial direction of the ball valve, the sphere is installed or disassembled. This assembly method reduces the pre-tightening force of the spring that the assembly tooling needs to overcome, reduces the use of the spring, and is conducive to reducing the wear and aging of the spring. At the same time, this assembly method does not require the assembly tooling to pull the valve seat, so there is no need to consider the force condition of the valve seat in the axial direction, which is conducive to reducing the assembly difficulty, reducing the risk of damaging the sealing surface of the valve seat assembly, and improving the assembly quality.

[0059] Embodiment 2: For example Figures 3 - 4 As shown, on the basis of the technical solution of Embodiment 1, further, a second gap 8 is reserved between the outer peripheral surface of the spring seat 2 and the valve body 6, and the second gap 8 communicates with the valve cavity; a first gap 9 is reserved between the inner peripheral surface of the spring seat 2 and the outer peripheral surface of the valve seat 4; the second gap 8 and the first gap 9 communicate through the cavity 10 where the spring 1 is located, so that the medium in the valve cavity can enter the cavity 10, exert a pressure on the valve seat 4 towards the sphere 7, and make the sealing part 5 and the sphere 7 in sealing contact.

[0060] As a preferred technical solution, for example Figure 3As shown, a pin hole 11 is provided on the thread surface 41 of the valve seat 4 close to the sphere 7. Increasing the distance from the pin hole 11 to the screw hole seat 3 is beneficial to reducing the force required to rotate the valve seat 4. Correspondingly, a pin rod is adapted to the pin hole 11. After the sealing effect of the sealing part 5 decreases, the valve stem and the connected valve cover are taken out, the pin rod is inserted into the pin hole 11, and the pin rod is pulled to screw the valve seat 4 in the direction of the valve body 6 in a threaded manner, so that the spring 1 is compressed and the pre-tightening force is increased; correspondingly, the reaction force of the spring 1 acting on the valve seat 4 increases, so that the sealing part 5 improves the sealing effect.

[0061] Preferably, a plurality of pin holes 11 are arranged around the thread surface 41, and the pin rod can be inserted into the pin hole 11 multiple times, so that the valve seat 4 can be continuously rotated multiple times in the same rotation direction.

[0062] Preferably, the pin holes 11 are located in the same radial plane.

[0063] Preferably, the bottom of the pin hole 11 is a conical groove. Correspondingly, one end of the pin rod is provided with a matching conical protrusion, which is beneficial to the positioning of the pin rod, reduces the internal wear of the pin hole 11 when the pin rod is pulled, and reduces the probability of impurities appearing due to the wear.

[0064] After the sealing effect of the sealing part decreases due to aging and / or wear, on the premise of keeping the position of the screw hole seat, through the cooperation of the pin rod and the pin hole, the pin rod is pulled to move the valve seat in the direction close to the sphere, so that the sealing part and the sphere are in sealing contact. At the same time, the screw hole seat can also be screwed tightly in the direction away from the sphere, so that the spring is compressed, the pre-tightening force of the spring is increased, and the sealing effect between the sealing part and the sphere is further increased.

[0065] In addition, when the second groove is set as an annular groove, when assembling the sphere, first through the cooperation of the pin rod and the pin hole, the pin rod is pulled to move the valve seat in the direction away from the sphere until the pin rod contacts the screw hole seat. Then, the valve seat is pulled in the direction away from the sphere through the assembly tooling, so that the distance between the left body and the right body of the valve seat is increased until the distance is greater than the diameter of the sphere in the axial direction of the ball valve, and then the sphere is installed or disassembled. This method is beneficial to reducing the distance that the assembly tooling pulls the valve seat, further reducing the assembly difficulty, reducing the risk of damaging the sealing surface of the valve seat assembly, and improving the assembly quality.

[0066] Embodiment 3: For example Figure 3 and Figure 5As shown, based on the technical solution of the second embodiment, further, the valve seat 4 is further provided with at least one third step 12. The third step 12 is provided as an annular step. The third step surface 121 of the third step 12 and the spring seat 2 form the cavity 10, and a third gap 13 is reserved between the third step surface 121 and the second step surface 612 of the second step 61, so that the medium in the cavity 10 can flow into the third gap 13. A limiting component 14 is arranged between the fourth step surface 122 of the third step 12 and the valve body 6, and the limiting component 14 faces the third connecting surface 123 of the third step 12. A piston cavity is formed among the limiting component 14, the third step 12 and the valve body 6, and the medium enters the piston cavity through the third gap 13 or through a fourth gap 15 existing between the valve body 6 and the fourth step surface 122, realizing the conduction of the medium pressure.

[0067] Preferably, based on the above method, further, the valve body 6 is provided with a fourth step 16 matching the third step 12, and the fourth step 16 is provided as the limiting component 14.

[0068] As a preferred technical solution, at least one elastic member 17 is arranged in the piston cavity. The elastic member 17 is used to block the third gap 13 and the fourth gap 15, so that it is difficult for the third gap 13 and the fourth gap 15 to communicate through the piston cavity, realizing the sealing between the valve cavity and the pipeline cavity. The elastic member 17 deforms under the action of the medium pressure, so that the elastic member 17 is in sealing contact with the valve body 6 and the valve seat 4.

[0069] Specifically, the width of the elastic member 17 in the axial direction is smaller than the distance from the third connecting surface 123 to the fourth connecting surface 161, so that the elastic member 17 can move axially in the piston cavity due to the medium pressure to adapt to different medium pressures; the elastic member 17 can also be in interference fit with the piston cavity, so that the elastic member 17 completely blocks the gap between the valve seat 4 and the valve body 6, reducing the backflow of the medium between the valve cavity and the pipeline, and at the same time reducing the wear of the elastic member 17 caused by movement.

[0070] Embodiment 4: For example Figure 1 As shown, this embodiment provides a fixed ball valve, including the valve seat assembly provided in any of the above embodiments, and further including: the valve body 6, the left and right inner sides of the valve body 6 are respectively abutted against the valve seat assembly, and the sealing part 5 of the valve seat assembly is abutted against the arc surface of the sphere 7 to achieve sealing contact. The upper end of the sphere 7 is connected with a valve rod passing through the opening of the valve body 6 and the valve cover, and the valve rod drives the sphere 7 to rotate to connect or block the upstream channel and the downstream channel.

[0071] The above embodiments are only used to illustrate the present utility model and do not limit the technical solutions described in the present utility model. Although the present specification has described the present utility model in detail with reference to the above respective embodiments, the present utility model is not limited to the above specific embodiments. Therefore, any modification or equivalent replacement made to the present utility model; and all technical solutions and their improvements that do not depart from the spirit and scope of the utility model are covered by the scope of the claims of the present utility model.

Claims

1. A valve seat assembly, characterized in that: include: A spring, the spring abuts against the valve body, one end of the spring away from the valve body is connected to a spring seat; the side of the spring seat close to the ball abuts against a screw hole seat; The screw hole seat surrounds the outer circumference of the valve seat, and the inner circumference of the screw hole seat and the outer circumference of the valve seat are provided with matching threads; the outer circumference of the valve seat is also provided with a smooth surface; the inner circumference of the spring seat is opposite to the threaded surface and / or the smooth surface of the valve seat; A first groove is provided on the sealing surface of the valve seat opposite to the arc surface of the sphere, and a sealing portion with an interference fit is provided in the first groove. The width of the outer circumference of the sealing portion is matched with the width of the outer circumference of the first groove, and the width of the inner circumference of the sealing portion is greater than the width of the inner circumference of the first groove, so that the sealing surface of the sealing portion forms an inclined surface matched with the arc surface of the sphere to form a sealing contact.

2. A valve seat assembly according to claim 1, characterized in that: The inner circumferential surface of the valve seat is provided with a second groove, and the second groove is used for positioning the assembly tool.

3. A valve seat assembly according to claim 1, characterized in that: A second gap is reserved between the outer circumference of the spring seat and the valve body; a first gap is reserved between the inner circumference of the spring seat and the valve seat; the second gap is connected to the first gap through the space where the spring is located.

4. A valve seat assembly according to claim 1, characterized in that: A height of a side surface of the sealing portion facing the first groove is smaller than a height of an inner side of the first groove.

5. A valve seat assembly according to any one of claims 1 to 4, characterized in that: The threaded surface of the valve seat close to the sphere is provided with a pin hole.

6. A valve seat assembly according to claim 5, characterized in that: The pin holes are provided in plurality.

7. A valve seat assembly according to claim 6, characterized in that: The bottom of the pin hole is conical.

8. A valve seat assembly according to any one of claims 1 to 4, characterized in that: The valve seat is also provided with at least one third step; a limit assembly is provided between the fourth step surface of the third step and the valve body, and the limit assembly and the third connecting surface of the third step are opposite to each other; a piston chamber is formed between the limit assembly, the third step and the valve body.

9. A valve seat assembly according to claim 8, characterized in that: The piston chamber is provided with at least one elastic member.

10. A fixed ball valve, characterized in that: The valve seat assembly comprises the valve body as claimed in any one of claims 1 to 9, and further comprises: the valve body, the left and right inner sides of the valve body respectively abutting against the valve seat assembly, the sealing portion of the valve seat assembly abutting against the arc surface of the sphere, and the upper end of the sphere is connected to a valve stem passing through the opening of the valve body and the valve cover.

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