Ball valve with buckling-pressing valve seat

Abstract

The ball valve comprises a valve body, a valve ball, a valve rod and a valve seat assembly, the valve body is provided with an inlet channel, an outlet channel and a valve cavity penetrating through the inlet channel and the outlet channel, the valve ball is arranged in the valve cavity and used for controlling the ball valve to be opened or closed, and the valve rod is connected to the valve ball and used for driving the valve ball to rotate. The valve seat assemblies are arranged on the two sides of the valve ball, each valve seat assembly comprises a valve seat, a supporting seat and a valve seat disc spring, each valve seat is buckled at the front end of the corresponding supporting seat, each valve seat disc spring is arranged at the rear end of the corresponding supporting seat, and an arc surface is arranged on the side, facing the valve ball, of each valve seat. And the valve seat disc spring axially extrudes the valve seat on the valve ball. According to the utility model, the valve seat is prevented from being deformed and fractured in the high-low temperature circulation process of the valve by buckling the valve seat; the valve seat disc spring provides axial compensation force to compensate deformation of the valve seat in the high and low temperature circulation process. The structure is simple, safe and reliable.

Description

Technical Field

[0001] The utility model relates to the field of valves, and particularly relates to a clamped valve seat ball valve. Background Art

[0002] Ball valves can be divided into fixed ball valves and floating ball valves. As the name implies, a floating ball valve refers to a ball valve in which the ball can produce a certain displacement under the action of the medium pressure and is pressed against the valve seat. The traditional floating ball valve cannot maintain stable sealing performance. When the ball valve is opened, the valve ball is separated from the valve seat, causing this part of the valve seat to lose support. Under the action of the fluid force, the valve seat will produce a certain bending. Each time the valve seat is opened, it bears a bending stress. In high and low temperature environments, the strength of the valve seat drops particularly significantly. Over time, the valve seat is difficult to withstand this bending stress, and serious deformation or even fracture will occur, resulting in seal failure. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a clamped valve seat ball valve, which solves the technical problems that in the background art, the strength of the valve seat of the existing floating ball valve drops in high and low temperature environments, and when the ball valve is opened, the valve seat bends and deforms under the action of the medium force, resulting in seal failure.

[0004] To achieve the above purpose, the utility model provides a clamped valve seat ball valve, which includes a valve body, a valve ball, a valve stem, and a valve seat assembly. The valve body has an inlet passage, an outlet passage, and a valve cavity that penetrates the inlet passage and the outlet passage. The valve ball is arranged in the valve cavity to control the opening or closing of the ball valve. The valve stem is connected to the valve ball to drive the valve ball to rotate. The valve seat assembly is arranged on both sides of the valve ball. The valve seat assembly includes a valve seat, a support seat, and a valve seat disc spring. The valve seat is clamped at the front end of the support seat, the valve seat disc spring is placed at the rear end of the support seat, an arc surface is arranged on the side of the valve seat facing the valve ball, and the valve seat disc spring axially presses the valve seat against the valve ball.

[0005] Further, a clamping portion is arranged at the front end of the support seat. After the valve seat is clamped with the support seat, a gap is left between the lower end surface of the clamping portion and the valve seat.

[0006] Further, the clamping angle of the clamping portion is 90°.

[0007] Further, at least two groups of valve seat disc springs are provided.

[0008] Further, a valve seat washer and a washer pressing pad are further arranged at the rear end of the support seat, and the washer pressing pad is located between the valve seat disc spring and the valve seat washer.

[0009] Further, the valve seat and the valve seat washer are made of engineering plastics.

[0010] Compared with the prior art, the beneficial effects of the present utility model are that the valve seat can be prevented from deforming and breaking during the high and low temperature cycling process by crimping the valve seat; the valve seat disc spring provides an axial compensation force to compensate for the deformation of the valve seat during the high and low temperature cycling process. The structure of the present utility model is simple, safe and reliable, and can still maintain good sealing performance under high and low temperature cycling conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Shows a structural cross-sectional view of the present utility model;

[0012] Figure 2 Shows a structural cross-sectional view of the valve seat assembly;

[0013] Figure 3 Shows a schematic structural view of the support seat before crimping;

[0014] Figure 4 Shows a schematic structural view of the valve seat and the support seat after crimping;

[0015] Figure 5 Shows Figure 4 the schematic structural view of the support seat in

[0016] Figure 6 Shows Figure 4 the schematic structural view of the valve seat in

[0017] Figure 7 Shows another schematic structural view of the valve seat and the support seat after crimping;

[0018] Figure 8 Shows Figure 7 the schematic structural view of the support seat in

[0019] Figure 9 Shows another schematic structural view of the valve seat and the support seat after crimping;

[0020] Figure 10 Shows Figure 9 the schematic structural view of the support seat in

[0021] Figure 11 Shows another schematic structural view of a derivative structure of the present utility model;

[0022] Figure 12 Shows another schematic structural view of the valve seat assembly, showing 4 groups of valve seat disc springs;

[0023] In the figure, 1 is the valve body; 2 is the valve ball; 3 is the valve seat, 4 is the support seat; 5 is the valve seat disc spring; 6 is the washer pressing pad; 7 is the valve seat washer; 8 is the valve stem; 9 is the packing pad; 10 is the lower packing; 11 is the upper packing; 12 is the valve stem disc spring; 13 is the packing gland; 14 is the end joint; 15 is the joint sealing gasket; 16 is the inlet passage; 17 is the outlet passage; 18 is the valve cavity; 19 is the valve stem passage; 20 is the central hole; 21 is the shoulder; 30 is the inner ring surface; 31 is the arc surface; 32 is the step surface; 33 is the side surface; 34 is the outer circumferential surface; 41 is the clamping portion; 42 is the support portion; 43 is the lower end surface; 44 is the side portion; 45 is the bottom. Detailed implementation mode

[0024] In order 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 accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0026] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the present utility model is customarily placed during use. It is 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 therefore should not be construed as a limitation of the present utility model.

[0028] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0029] In the description of the present utility model, it should also be noted that, unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] The following will describe in detail some embodiments of the present utility model with reference to the accompanying drawings.

[0031] See the attached Figures 1 - 2 As shown, a clamping valve seat ball valve of the present utility model includes a valve body 1, a valve ball 2, and a valve stem 8. The valve body 1 is provided with an inlet passage 16 and an outlet passage 17 in its horizontal direction, and a valve stem passage 19 opening upward in its vertical direction. The hollow valve cavity 18 communicates with the inlet passage 16, the outlet passage 17, and the valve stem passage 19. The valve ball 2 is arranged in the valve cavity 18. The valve ball 2 is spherical and has a through central hole 20 in the axial direction. The valve stem 8 is arranged in the valve stem passage 19. The lower end of the valve stem 8 is connected to the valve ball 2, and the upper end extends out of the valve stem passage 19. The valve stem 8 can drive the valve ball 2 to rotate axially. A valve stem seal assembly is arranged in the valve stem passage 19. The valve stem seal assembly includes a packing gasket 9, a lower packing 10, an upper packing 11, and a valve stem disc spring 12. The valve stem seal assembly is pressed by a packing gland 13 connected by threads at the outlet of the valve stem passage 19. The lower packing 10 and the upper packing 11 are in a V shape and are inverted with each other. They can be made of engineering plastics such as PTFE + glass fiber, PTFE, PCTFE, and PEEK. The V-shaped packing can reduce the operating torque and increase the self-sealing function. The valve stem disc spring 12 can compensate for the deformation of the packing caused by pressure and temperature changes and compensate for the wear of the packing. When the valve ball 2 rotates until the central hole 20 is flush with the inlet passage 16 and the outlet passage 17, the valve opens; when the valve ball 2 rotates until the central hole 20 is perpendicular to the inlet passage 16 and the outlet passage 17, the valve closes.

[0032] Valve seat assemblies are arranged on both sides of the valve ball 2. The valve seat assembly includes a valve seat 3, a support seat 4, and a valve seat disc spring 5. The valve seat 3 is adjacent to the valve ball 2 and is clamped at the front end of the support seat 4. The valve seat disc spring 5 is arranged at the rear end of the support seat 4. One side of the valve seat 3 facing the ball valve 2 is provided with an arc surface 31 that fits the spherical surface of the ball valve 2. See the attached specifically Figures 3 - 10, the support seat 4 has a larger front end and a smaller rear end, the larger front end includes a bottom 45, a side 44 and a buckling portion 41, and the smaller rear end includes a support portion 42, and the support portion 42 is opposite to the bottom 45. Before buckling, the larger front end of the support seat 4 is a rectangle with three closed sides and an opening to the left. The valve seat 3 is roughly annular, with an inner ring surface 30, the inner ring surface 30 is adjacent to the arc surface 31 in front, and adjacent to the side surface 33 in the back, the arc surface 31 upwardly receives the step surface 32, and the step surface 32 is connected to the outer circumferential surface 34. The valve seat 3 can be made of engineering plastics such as PTFE+glass fiber, PTFE, PCTFE, PEEK, etc. The valve seat 3 is arranged at the front end of the support seat 4, specifically, the inner ring surface 30 of the valve seat 3 is placed on the bottom 45 of the support seat 4, and the side 33 is against the side 44. When buckling, the buckling portion 41 of the support seat 4 is bent downward until the buckling portion 41 holds the valve seat 3. The benefits of this buckling structure are particularly evident in high and low temperature applications, because the valve seat 3 is softer and more easily deformed or even broken at high and low temperatures than at room temperature. The support seat 4 can hold the valve seat 3 so that it does not bend or deform, effectively solving the problem of bending and deformation caused by the loss of support when the traditional ball valve falls off the valve seat.

[0033] After the buckling molding, there is a gap L between the lower end 43 of the buckling portion 41 and the step surface 32 of the valve seat 3. The gap L is preferably controlled between 1 / 5 and 2 / 5 of the thickness H of the buckling portion 41. The gap L can prevent the support seat 4 from generating internal stress on the valve seat 3, and effectively avoid deformation of the arc surface 31 of the valve seat 3. The buckling angle α of the buckling portion 41 is controlled between 60° and 150°. Figures 7 - 8 The buckling angle of the middle buckling portion 41 is 60°. Figures 9 - 10 The buckling angle of the middle buckling portion 41 is 150°. If the buckling angle is too small, the front end of the buckling portion 41 is easy to cut into the valve seat 3, which damages the integrity of the valve seat 3 and reduces the service life of the valve seat 3; if the buckling angle is too large, the valve seat 3 is not buckled firmly and may become loose. Preferably, the buckling angle α is 90°, which is a right angle. On the one hand, the buckling portion 41 can half-enclose the valve seat 3, and on the other hand, the front end of the buckling portion 41 will not cut into the valve seat 3, which ensures the integrity of the valve seat 3.

[0034] The front valve seat assembly is arranged at the shaft shoulder 21 formed by the inlet channel 16 and the valve cavity 18, and the rear valve seat assembly is arranged on the left side of the end joint 14. The end joint 14 is threadedly connected to the outlet channel 17 of the valve body 1, and the front valve seat assembly and the rear valve seat assembly are kept on both sides of the valve ball 2. A joint sealing gasket 15 is arranged between the end joint 14 and the valve body 1. The joint sealing gasket 15 is a sealing pair between the end joint 14 and the valve body 1. The main material is 316L, and it can also be made of alloy. The metal hard seal prevents it from being deformed due to temperature changes, and realizes reliable sealing in high and low temperature cycle applications.

[0035] AttachedFigure 11 Another derivative structure of the present utility model is shown. Among them, the end connectors 14 are symmetrically connected to both ends of the valve body 1, and a washer pressing pad 6 and a valve seat washer 7 are arranged on the valve seat assembly. The valve seat pressing pad 6 and the valve seat washer 7 are arranged at the rear end of the support seat 4. The valve seat pressing pad 6 is located between the valve seat disc spring 5 and the valve seat washer 7. The valve seat washer 7 can be made of the same material as the valve seat 3. The valve seat pressing pad 6 and the valve seat washer 7 are confined in the space formed by the support seat 4, the valve seat disc spring 5, and the end connectors 14. The gap between the washer pressing pad 6 and the end connectors 14 and the support seat 4 is less than 0.05 mm. The smaller gap can prevent the valve seat washer 7 from being extruded by the medium. The valve seat disc spring 5 can compensate for the deformation and mechanical wear of the valve seat 3 and the valve seat washer 7 caused by pressure and temperature changes in both directions. Multiple groups of valve seat disc springs 5 can be set according to actual needs, as shown in the appendix Figure 12 shown

[0036] The basic principles and advantages of the present utility model have been described above. For those skilled in the art, the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit them. Although the present utility model has been described in detail with reference to the foregoing embodiments, after reading this specification, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features therein. Without departing from the concept of the present utility model, any obvious replacement is within the protection scope of the present utility model

Claims

1. A ball valve with a pressed seat, characterized in that: include: A valve body (1), wherein the valve body (1) has an inlet channel (16) and an outlet channel (17), and a valve chamber (18) that passes through the inlet channel (16) and the outlet channel (17); A valve ball (2), the valve ball (2) being arranged in the valve chamber (18) and used for controlling the ball valve to open or close; a valve stem (8), the valve stem (8) being connected to the valve ball (2) and used for driving the valve ball (2) to rotate; A valve seat assembly, wherein the valve seat assembly is arranged on both sides of a valve ball (2), and the valve seat assembly comprises a valve seat (3), a support seat (4), and a valve seat disc spring (5); the valve seat (3) is buckled on the front end of the support seat (4), and the valve seat disc spring (5) is arranged at the rear end of the support seat (4); a circular arc surface (31) is arranged on the side of the valve seat (3) facing the valve ball (2), and the valve seat disc spring (5) axially presses the valve seat (3) onto the valve ball (2).

2. A press-fit seat ball valve according to claim 1, characterized in that: The front end of the support seat (4) is provided with a pressing portion (41), and after the valve seat (3) and the support seat (4) are pressed together, a gap is left between the lower end surface of the pressing portion (41) and the valve seat (3).

3. A press-fit seat ball valve according to claim 2, characterized in that: The buckling angle of the buckling portion (41) is 90°.

4. A press-fit seat ball valve according to claim 3, characterized in that: The valve seat disc springs (5) are at least two groups.

5. The press-fit seat ball valve according to claim 4, characterized in that: A valve seat gasket (7) and a gasket pressure pad (6) are also provided at the rear end of the support seat (4); the gasket pressure pad (6) is located between the valve seat disc spring (5) and the valve seat gasket (7).

6. A press-fit seat ball valve according to any one of claims 1 to 5, characterized in that: The valve seat (3) and the valve seat gasket (7) are made of engineering plastics.

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