Fixed ball valve of floating valve seat

Abstract

The utility model discloses a fixed ball valve with floating type valve seats, which relates to the technical field of ball valves and comprises a valve body, a ball body arranged in the valve body and the valve seats arranged on two sides of the ball body, a spherical surface support disc is arranged between each valve seat and the valve body, one end of each valve seat far away from the ball body is provided with a convex spherical surface, and the other end of each valve seat far away from the ball body is provided with a concave spherical surface. A convex spherical surface is arranged in the valve body, a concave spherical surface matched with the convex spherical surface is arranged on the spherical supporting disc, the spherical radius of the convex spherical surface is equal to that of the concave spherical surface, the spherical supporting disc is arranged in the valve body in a sliding mode in the axial direction, and a spring is arranged between the spherical supporting disc and the valve body. And the spring provides elastic force for driving the spherical supporting disc to move close to the ball body. The sealing spherical surface of the valve seat can automatically align the spherical surface of the ball body, and the effect of complete sealing is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, in particular to a fixed ball valve with a floating valve seat. Background Technique

[0002] A so-called fixed ball valve means that its opening and closing member is a sphere. The sphere is installed on the valve body via a valve stem and a support shaft. The sphere is driven by the valve stem and rotates around the axis of the valve stem. Only by rotating the valve stem by 90 degrees can the opening and closing of the valve be completed.

[0003] The sphere of the ball valve is arranged in the center of the valve. Two valve seats are symmetrically arranged horizontally on both sides of the sphere. The sealing surface of the valve seat coincides with the spherical surface of the sphere. The position of the sphere is fixed. After the two valve seats symmetrically arranged horizontally on both sides of the sphere are subjected to the spring force and the medium pressure, the valve seats move horizontally towards the center of the sphere of the sphere, so that the sealing spherical surface of the valve seat tightly presses on the spherical surface of the sphere to form a seal.

[0004] To achieve complete sealing, the sealing spherical surface of the valve seat and the spherical surface of the sphere must be concentric. Due to the existence of the shape and position errors in the machining of parts, the sealing spherical surface of the valve seat and the spherical surface of the sphere cannot be guaranteed to be concentric. In the existing fixed ball valves, the valve seats can only move axially in the horizontal direction, and the problem that the valve cannot be completely sealed due to the non-concentricity of the sealing spherical surface of the valve seat and the spherical surface of the sphere cannot be solved. Content of the Utility Model

[0005] The purpose of the utility model is to provide a fixed ball valve with a floating valve seat to solve the problems existing in the above-mentioned prior art, so that the sealing spherical surface of the valve seat can automatically align with the spherical surface of the sphere to achieve the effect of complete sealing.

[0006] To achieve the above purpose, the utility model provides the following scheme:

[0007] The utility model provides a fixed ball valve with a floating valve seat, which includes a valve body, a sphere arranged in the valve body, and valve seats arranged on both sides of the sphere. A spherical support plate is arranged between each valve seat and the valve body. The end of the valve seat far from the sphere is provided with a convex spherical surface. The spherical support plate is provided with a concave spherical surface matching with the convex spherical surface. The spherical radii of the convex spherical surface and the concave spherical surface are equal. The spherical support plate is slidably arranged axially in the valve body. A spring is arranged between the spherical support plate and the valve body. The spring provides an elastic force to drive the spherical support plate to move close to the sphere.

[0008] Preferably, a ring pressing plate is arranged on one side of each valve seat far from the spherical support plate. The ring pressing plate is connected with the corresponding valve seat through a corrugated pipe. The corrugated pipe is sleeved outside the valve seat. The ring pressing plate is fixed on the inner end surface of the flange of the valve body through bolts.

[0009] Preferably, both ends of the corrugated pipe are welded and connected to the annular pressing plate and the valve seat in a circumferential manner.

[0010] Preferably, the corrugated pipe is made of thin-walled steel plate.

[0011] Preferably, the annular pressing plate is provided with a circular ring-shaped convex platform, the inner end face of the flange of the valve body is provided with an annular groove corresponding to the circular ring-shaped convex platform, an elastic sealing ring is arranged in the annular groove, and the circular ring-shaped convex platform is inserted into the annular groove and presses the elastic sealing ring.

[0012] Preferably, the top of the sphere is fixedly connected to the valve stem, the bottom of the sphere is connected to the support shaft, and the support shaft is installed on the valve body.

[0013] Preferably, the flange of the valve body is provided with a circular groove for placing the spring.

[0014] The utility model has achieved the following technical effects compared with the prior art:

[0015] For the fixed ball valve with a floating valve seat provided by the utility model, when the sealing spherical surface of the valve seat is not centered with the spherical surface of the sphere, under the action of the elastic force of the spring and the medium pressure, since the convex spherical surface of the valve seat and the concave spherical surface of the spherical support disc are in spherical surface fit, the valve seat can swing, so that the sealing spherical surface of the valve seat can automatically align with the spherical surface of the sphere, thereby achieving the effect of complete sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of the fixed ball valve with a floating valve seat in the embodiment of the present invention;

[0018] Figure 2 It is Figure 1 a partial enlarged schematic view of part A in

[0019] Figure 3 It is a schematic connection structure diagram of the valve seat and the annular pressing plate in the embodiment of the present invention;

[0020] Figure 4 It is Figure 3 a partial enlarged schematic view of part B in

[0021] In the figure: 1 - valve body, 2 - sphere, 3 - valve seat, 4 - spherical support disk, 5 - convex spherical surface, 6 - concave spherical surface, 7 - spring, 8 - annular pressing plate, 9 - bellows, 10 - bolt, 11 - flange, 12 - circular boss, 13 - annular groove, 14 - elastic sealing ring, 15 - valve stem, 16 - support shaft, 17 - circular groove. Detailed implementation mode

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0023] The purpose of the present invention is to provide a fixed ball valve with a floating valve seat to solve the problems existing in the prior art, so that the sealing spherical surface of the valve seat can automatically align with the spherical surface of the sphere to achieve a completely sealed effect.

[0024] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0025] As Figures 1 - 4 shown, the present invention provides a fixed ball valve with a floating valve seat, including a valve body 1, a sphere 2 arranged in the valve body 1, and valve seats 3 arranged on both sides of the sphere 2. A spherical support disk 4 is provided between each valve seat 3 and the valve body 1. A convex spherical surface 5 is provided at one end of the valve seat 3 away from the sphere 2, and a concave spherical surface 6 matching the convex spherical surface 5 is provided on the spherical support disk 4. The spherical radii of the convex spherical surface 5 and the concave spherical surface 6 are equal. The spherical support disk 4 provides horizontal support for the valve seat 3. The spherical support disk 4 is slidably arranged along the axial direction in the valve body 1. A spring 7 is provided between the spherical support disk 4 and the valve body 1. The spring 7 provides an elastic force to drive the spherical support disk 4 to move closer to the sphere 2.

[0026] The convex spherical surface 5 of the valve seat 3 is in spherical mating connection with the corresponding concave spherical surface 6 on the spherical support disk 4, and the spherical surfaces of the two parts are in contact. The sealing spherical surface of the valve seat 3 is in contact with the spherical surface of the sphere 2. When the sealing spherical surface of the valve seat 3 and the spherical surface of the sphere 2 are not centered, under the action of the elastic force of the spring 7 and the medium pressure, since the convex spherical surface 5 of the valve seat 3 and the concave spherical surface 6 of the spherical support disk 4 are in spherical mating, the valve seat 3 can swing, so that the sealing spherical surface of the valve seat 3 can automatically align with the spherical surface of the sphere 2, thereby achieving a completely sealed effect.

[0027] Among them, the functions of the spring 7 are as follows:

[0028] (1) The elastic force of the spring 7 serves as the driving force for the spherical support disc 4 to move horizontally, so that the convex spherical surface 5 of the valve seat 3 and the concave spherical surface 6 of the spherical support disc 4 always remain in contact.

[0029] (2) The pre-tightening force of the spring 7 provides an initial sealing specific pressure between the sphere 2 and the valve seat 3. Under the combined action with the pressure of the medium, it pushes the sealing spherical surface of the valve seat 3 to press tightly against the spherical surface of the sphere 2, preventing the leakage of fluid in the flow channel.

[0030] (3) When the sealing spherical surface of the valve seat 3 or the spherical surface of the sphere 2 is worn, the valve seat 3 can automatically compensate for the worn part under the action of the spring 7, so that the valve seat 3 and the sphere 2 continue to maintain good contact.

[0031] In this embodiment, an annular pressing plate 8 is provided on one side of each valve seat 3 away from the spherical support disc 4. The annular pressing plate 8 is connected to the corresponding valve seat 3 through a bellows 9. The bellows 9 is sleeved outside the valve seat 3, and the annular pressing plate 8 is fixed to the inner end surface of the flange 11 of the valve body 1 by bolts 10. The bellows 9 can be axially stretched or compressed, and allows slight torsion and swing within its elastic range in the circumferential direction. Due to the limitations of the outer shape design of the valve seat 3, the fixation of the annular pressing plate 8 and the flange 11, and the fact that the bellows 9 can only allow slight torsion within its elastic range in the circumferential direction, the offset and swing of the valve seat 3 can be controlled within the required range, and large-scale swing and offset will not occur.

[0032] In this embodiment, both ends of the bellows 9 are welded to the annular pressing plate 8 and the valve seat 3 in a full-circle manner. The fluid outside the bellows 9 will not leak into the space formed by the bellows 9 and the valve seat 3, thus preventing the fluid that enters the space formed by the outer surface of the bellows 9 and the flange 11 through the spherical support disc 4 from leaking into the space formed by the bellows 9 and the valve seat 3.

[0033] In this embodiment, the bellows 9 is made of thin-walled steel plate.

[0034] In this embodiment, a circular ring-shaped convex platform 12 is provided on the annular pressing plate 8, and an annular groove 13 corresponding to the circular ring-shaped convex platform 12 is provided on the inner end surface of the flange 11 of the valve body 1. An elastic sealing ring 14 is provided in the annular groove 13. The circular ring-shaped convex platform 12 is inserted into the annular groove 13 and presses the elastic sealing ring 14 tightly. Among them, the elastic sealing ring 14 is a flexible high-temperature-resistant sealing ring. When the bolt 10 on the annular pressing plate 8 is tightened, the circular ring-shaped convex platform 12 is inserted into the annular groove 13 and presses the elastic sealing ring 14 to form a seal, thereby blocking the leakage channel of the fluid here.

[0035] In this embodiment, the top of the sphere 2 is fixedly connected to the valve stem 15, the bottom of the sphere 2 is connected to the support shaft 16, and the support shaft 16 is installed on the valve body 1. The round hole in the upper part of the sphere 2 is coaxially sleeved with the cylindrical section at the lower part of the valve stem 15. Key grooves are provided in the round hole of the valve stem 15 and the sphere 2, and a flat key is placed in the key groove. When the valve stem 15 rotates, the sphere 2 is driven to rotate by the flat key. The round hole in the lower part of the sphere 2 is coaxially sleeved with the cylindrical section at the upper end of the support shaft 16. The valve stem 15 and the support shaft 16 are coaxially sleeved in the corresponding round holes of the valve body 1. Restrained by the valve stem 15, the support shaft 16 and the valve body 1, the sphere 2 is fixed in all three directions of X, Y, and Z and cannot move, but can rotate around the common axis of the valve stem 15 and the support shaft 16.

[0036] In this embodiment, a round groove 17 for placing the spring 7 is provided on the flange 11 of the valve body 1, which can limit the spring 7 and ensure the stability of the spring 7.

[0037] In the present utility model, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A fixed ball valve with a floating valve seat, comprising a valve body, a ball disposed within the valve body, and valve seats disposed on both sides of the ball, characterized in that: A spherical support disk is provided between each of the valve seats and the valve body. A convex spherical surface is provided at one end of the valve seat away from the sphere. A concave spherical surface that mates with the convex spherical surface is provided on the spherical support disk. The spherical radii of the convex spherical surface and the concave spherical surface are equal. The spherical support disk is slidably arranged axially in the valve body. A spring is provided between the spherical support disk and the valve body, and the spring provides an elastic force that drives the spherical support disk to move closer to the sphere.

2. The floating valve seat fixed ball valve according to claim 1, characterized in that: An annular pressing plate is provided on one side of each of the valve seats away from the spherical support disk. The annular pressing plate and the corresponding valve seat are connected by a corrugated pipe. The corrugated pipe is sleeved outside the valve seat. The annular pressing plate is fixed to the inner end surface of the flange of the valve body by bolts.

3. The floating valve seat fixed ball valve according to claim 2, wherein: Both ends of the corrugated pipe are welded to the annular pressing plate and the valve seat in a full-circle manner.

4. The floating valve seat fixed ball valve according to claim 2, wherein: The corrugated pipe is made of thin-walled steel plate.

5. The floating valve seat fixed ball valve according to claim 2, characterized in that: A circular ring-shaped convex platform is provided on the annular pressing plate. An annular groove corresponding to the circular ring-shaped convex platform is provided on the inner end surface of the flange of the valve body. An elastic sealing ring is provided in the annular groove. The circular ring-shaped convex platform is inserted into the annular groove and compresses the elastic sealing ring.

6. The floating valve seat fixed ball valve according to claim 1, wherein: The top of the sphere is fixedly connected to the valve stem, and the bottom of the sphere is connected to the support shaft. The support shaft is installed on the valve body.

7. The floating valve seat fixed ball valve according to claim 1, characterized in that: A circular groove for placing the spring is provided on the flange of the valve body.

Images