Ball valve

Abstract

The ball valve comprises a valve body, a valve ball, a valve seat and a combined sealing piece, the valve ball, the valve seat and the combined sealing piece are arranged in the valve body, a through flow channel is arranged in the valve body, the valve ball is installed in the flow channel through a valve rod, the valve seat is installed on the pipe wall of the flow channel through a valve seat supporting seat, and the combined sealing piece is arranged on the contact face of the valve ball and the valve seat. The combined sealing piece comprises an ultra-high molecular weight polyethylene valve seat jacket and a ball valve seat memory metal spring arranged in the ultra-high molecular weight polyethylene valve seat jacket. The ball valve has good weather resistance and high and low temperature resistance, sealing strength and abrasion resistance are improved, energy storage and stability are provided, and the problems that an existing reversing valve seat is poor in sealing performance, and when a pressure medium is extremely small, valve seat pre-tightening force cannot achieve due thrust, and inner leakage occurs in the ball valve are solved.

Description

Technical Field

[0001] The utility model relates to the field of sealing elements, in particular to a ball valve. Background Art

[0002] At present, most of the reversing valves are ball valves, which need to have good sealing properties. Therefore, the requirements for fluid valves and joints are very stringent, and leakage and other situations need to be avoided. Especially for industries with strict sealing requirements, the sealing problems of ball valves will bring huge safety hazards, and the cost waste of labor, work delays, materials, etc. caused by frequent maintenance and replacement is also huge.

[0003] In CN202010145353.6, a high sealing ball valve is disclosed, which includes an inlet valve body, an outlet valve body, a ball valve, a valve seat, a first sealing member, a spring, a handle and a valve stem control mechanism. Two valve seats are installed in the inlet valve body and the outlet valve body, and the ball valve is installed in the two valve seats. The first sealing member that abuts against the ball valve is installed at one end of the valve seat close to the ball valve, and the other end of the valve seat abuts against the spring. The valve stem control mechanism is provided with a connecting seat, a valve stem shaft, a sleeve, an X-shaped sealing member and a second sealing member. The outer periphery of the connecting seat is provided with a second sealing member that closely matches the inner wall of the connecting cavity. The sleeve is sleeved on the outside of the valve stem shaft, and the valve stem shaft and the sleeve are installed in the connecting seat. An X-shaped sealing member is provided between the bottom of the sleeve and the connecting seat, and the bottom of the valve stem shaft is connected to the ball valve, and a handle is installed on the top of the valve stem shaft. The ball valve has good sealing performance. The patent uses the sealing bevel and the first sealing lip on the first sealing member, which can abut against the ball valve to achieve a double sealing effect. Existing soft seals generally use engineering plastics such as polytetrafluoroethylene and modified polytetrafluoroethylene, nylon, PEEK, DEVLONE, etc. After repeated frequent switching, the valve seat will continue to wear, thereby affecting the service life of the valve seat. In addition, after the polytetrafluoroethylene (PTFE) valve seat is worn, the pre-tightening force will continue to decrease, causing the ball valve to leak. When the outlet end is worn and the pre-tightening force is insufficient, the valve seal will fail. When the pressure medium is extremely small, the valve seat pre-tightening force cannot play the due thrust, causing the ball valve to leak internally, reducing the service life of the sealed ball valve, and failing to meet the demand. Utility Model Content

[0004] The utility model is to solve the sealing problem of the valve seat of the existing reversing valve mentioned in the above background technology, and the utility model provides a ball valve.

[0005] The technical solution adopted by the utility model is:

[0006] A ball valve comprises a valve body, a valve ball, a valve seat and a combined seal arranged inside the valve body, wherein a through flow channel is arranged inside the valve body, the valve ball is installed in the flow channel through a valve stem, the valve seat is installed on the pipe wall of the flow channel through a valve seat support seat, and a combined seal is arranged on the contact surface of the valve ball and the valve seat; the combined seal comprises a valve seat jacket and a memory metal spring arranged in the valve seat jacket. The utility model adopts a combined seal containing a metal spring between the valve ball and the valve seat to achieve an excellent sealing effect under low pressure, and at the same time, the seal becomes more stable as the pressure increases, and zero leakage can be achieved.

[0007] Furthermore, the valve seat jacket includes a sealing base and a sealing lip, a memory metal spring is provided in the sealing lip, and the inclination angle between the bottom plane of the sealing base and the plane of the jacket is 30 to 60 degrees. Through the angle design of the valve seat jacket, it can better fit with the spherical surface.

[0008] Furthermore, the inclination angle between the bottom plane of the sealing base and the plane of the jacket is 30°, 45° or 60°.

[0009] Furthermore, the valve seat jacket is made of ultra-high molecular weight polyethylene material, which has reliable weather resistance and is suitable for temperatures between -180°C and 120°C, covering the use requirements of the reversing valve seat sealing structure in various occasions. Therefore, the dynamic sealing structure has high temperature adaptability. At the same time, the friction coefficient between the ultra-high molecular weight polyethylene material and the metal is low. The low level of friction not only reduces the wear of the sealing lip, but also reduces the friction heat, which greatly extends the service life of the sealing jacket.

[0010] Furthermore, the memory metal spring is an O-shaped spring with a spiral reverse double-layer structure. Preferably, the internal memory metal spring can be made of nickel alloy, which has very strong low temperature resistance and chemical properties, will not corrode and affect performance under special environments, and its service life is greatly extended.

[0011] Furthermore, the diameter of the O-shaped spring is 2.8 mm to 6.35 mm.

[0012] Furthermore, the flow channel in the valve body is a two-way, three-way or four-way structure.

[0013] Furthermore, the valve ball is installed at the intersection center of the flow channels of the three-way or four-way structure, and the valve seat is installed on the pipe wall of each flow channel at the intersection of the flow channels.

[0014] Furthermore, the combined sealing element is installed on the valve seat.

[0015] Furthermore, the valve seat includes a base and an energy storage spring on the base, the combined seal is installed on the base, and the energy storage spring is in contact with the combined seal.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The exterior of the valve ball of the utility model adopts a combined seal of an ultra-high molecular polyethylene jacket and an internal ball valve seat memory metal spring. The ultra-high molecular polyethylene has good weather resistance and high and low temperature resistance. The ultra-high molecular molecular weight of not less than 9 million increases its strength and wear resistance. The O-type memory metal spring with a spiral reverse double-layer structure provides better energy storage and stability.

[0018] Through structural innovation, the utility model optimizes the cross-sectional structure of the ball valve seat memory metal spring into an O-type energy storage spring structure, and is designed as a 60°, 45°, and 30° structure, so that the sealing valve seat can better fit with spherical surfaces of various diameters, achieving excellent sealing effects under low pressure. At the same time, the special structure makes the seal more stable as the pressure increases, and zero leakage can be achieved. Through repeated design and testing, the original seal will have low leakage in different situations after 2,000 times of sealing, and needs to be replaced in time. The utility model passed the normal temperature sealing test for 6,000 working times, and then added 5,000 low temperature tests, and met a total of 11,000 tests with a leakage rate of zero leakage, which also verified that its weather resistance performance fully met the standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 : A schematic diagram of a top view of a ball valve;

[0020] Figure 2 : A schematic diagram of the cross-sectional structure of a ball valve;

[0021] Figure 3 : A schematic structural diagram of a ball valve assembly seal;

[0022] Figure 4 : Schematic diagram of the structure of a ball valve combined with an ultra-high molecular weight polyethylene valve seat jacket.

[0023] In the figure: 1. valve ball; 2. combined seal; 3. valve seat; 4. valve body; 5. valve stem; 6. valve seat jacket; 7. memory metal spring. DETAILED DESCRIPTION

[0024] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through a specific implementation method and in combination with its drawings. In the following description, many specific details are described to facilitate a full understanding of the present application, but the present application can also be implemented in other ways different from those described herein, so the scope of protection of the present application is not limited by the specific embodiments disclosed below. In addition, in the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application 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 cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly specified and specifically defined. In this application, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection, an electrical connection, or a communication; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In this application, unless otherwise clearly specified and defined, the first feature "on" or "under" the second feature can be the first and second features directly contacting, or the first and second features indirectly contacting through an intermediate medium. In the description of this specification, the description of the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0025] Example 1

[0026] This embodiment provides a ball valve, including a valve body 4, and a valve ball 1, a valve seat 3 and a combined seal 2 arranged inside the valve body 4. The valve body 4 is provided with a flow channel with two ends passing through, the valve ball 1 is installed in the flow channel through a valve stem 5, the valve seat 3 is installed on the pipe wall of the flow channel through a valve seat 3 support seat, and the contact surface of the valve ball 1 and the valve seat 3 is provided with a combined seal 2.

[0027] The combined seal comprises a valve seat jacket 6 made of ultra-high molecular polyethylene material, the valve seat jacket 6 comprises a sealing base and a sealing lip, and an O-shaped memory metal spring 7 with a diameter of 2.8 mm to 6.35 mm and a spiral reverse double-layer structure is arranged in the sealing lip.

[0028] The valve ball 1 of this embodiment adopts a combined seal of an ultra-high molecular polyethylene jacket on the outside and a memory metal spring 7 on the internal ball valve seat 3. The ultra-high molecular polyethylene has good weather resistance and high and low temperature resistance. Its strength and wear resistance are increased by an ultra-high molecular molecular weight of not less than 9 million. The O-type memory metal spring 7 with a spiral reverse double-layer structure provides better energy storage and stability.

[0029] Example 2

[0030] This embodiment provides a ball valve, including a valve body 4, and a valve ball 1, a valve seat 3, and a combined seal 2 arranged inside the valve body 4. The valve body 4 is provided with three intersecting flow channels, the valve ball 1 is installed at the intersection center of the flow channels of the three-way structure through the valve stem 5, the valve seat 3 is installed on the pipe wall of each flow channel at the intersection of the flow channels, and the contact surface of the valve ball 1 and the valve seat 3 is provided with a combined seal 2.

[0031] The combined seal comprises a valve seat jacket 6 made of ultra-high molecular polyethylene material, the valve seat jacket 6 comprises a sealing base and a sealing lip, the bottom plane of the sealing base and the plane of the jacket have an inclination angle of 30°, and an O-shaped memory metal spring 7 with a diameter of 2.8 mm to 6.35 mm and a spiral reverse double-layer structure is arranged in the sealing lip.

[0032] The valve ball 1 of this embodiment adopts a combined seal of an ultra-high molecular polyethylene jacket on the outside and a memory metal spring 7 on the internal ball valve seat 3. The ultra-high molecular polyethylene has good weather resistance and high and low temperature resistance. Its strength and wear resistance are increased by an ultra-high molecular weight of not less than 9 million. The O-type memory metal spring 7 with a spiral reverse double-layer structure can better provide energy storage and stability. In addition, the angle design of the valve seat jacket 6 allows the sealing valve seat 3 to better fit the valve ball 1 with various spherical diameters.

[0033] Example 3

[0034] This embodiment provides a ball valve, including a valve body 4, and a valve ball 1, a valve seat 3, and a combined seal 2 arranged inside the valve body 4. The valve body 4 is provided with four cross-through flow channels, the valve ball 1 is installed at the intersection center of the flow channels of the four-way structure through the valve stem 5, the valve seat 3 is installed on the pipe wall of each flow channel at the intersection of the flow channels, and the contact surface of the valve ball 1 and the valve seat 3 is provided with a combined seal 2.

[0035] The combined seal comprises a valve seat jacket 6 made of ultra-high molecular polyethylene material, the valve seat jacket 6 comprises a sealing base and a sealing lip, the bottom plane of the sealing base and the plane of the jacket have an inclination angle of 60°, and an O-shaped memory metal spring 7 with a diameter of 2.8 mm to 6.35 mm and a spiral reverse double-layer structure is arranged in the sealing lip.

[0036] The valve ball 1 of this embodiment adopts a combined seal of an ultra-high molecular polyethylene jacket on the outside and a memory metal spring 7 on the internal ball valve seat 3. The ultra-high molecular polyethylene has good weather resistance and high and low temperature resistance. Its strength and wear resistance are increased by an ultra-high molecular weight of not less than 9 million. The O-type memory metal spring 7 with a spiral reverse double-layer structure can better provide energy storage and stability. In addition, the angle design of the valve seat jacket 6 allows the sealing valve seat 3 to better fit the valve ball 1 with various spherical diameters.

[0037] Example 4

[0038] This embodiment provides a ball valve, including a valve body 4, and a valve ball 1, a valve seat 3 and a combined seal 2 arranged inside the valve body 4. The valve body 4 is provided with four cross-through flow channels, the valve ball 1 is installed at the intersection center of the flow channels of the four-way structure through the valve stem 5, the valve seat 3 is installed on the pipe wall of each flow channel at the intersection of the flow channels, the valve seat 3 includes a base, an energy storage spring, and the combined seal 2 is installed on the base through a threaded connection, and an energy storage spring is provided on the base to fit with the combined seal 2, and the difference with the valve ball 1 can be automatically compensated under the compression of the energy storage spring, ensuring that the combined seal 2 always keeps a close fit with the valve ball 1.

[0039] The combined seal comprises a valve seat jacket 6 made of ultra-high molecular polyethylene material, the valve seat jacket 6 comprises a sealing base and a sealing lip, the bottom plane of the sealing base and the plane of the jacket are inclined at an angle of 90°, and an O-shaped memory metal spring 7 with a diameter of 2.8 mm to 6.35 mm and a spiral reverse double-layer structure is arranged in the sealing lip.

[0040] The valve ball 1 of this embodiment adopts a combined seal of an ultra-high molecular polyethylene jacket on the outside and a memory metal spring 7 on the internal ball valve seat 3. The ultra-high molecular polyethylene has good weather resistance and high and low temperature resistance. Its strength and wear resistance are increased by an ultra-high molecular weight of not less than 9 million. The O-type memory metal spring 7 with a spiral reverse double-layer structure can better provide energy storage and stability. In addition, the angle design of the valve seat jacket 6 allows the sealing valve seat 3 to better fit the valve ball 1 with various spherical diameters.

[0041] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A ball valve, characterized in that: It includes a valve body, a valve ball, a valve seat and a combined seal arranged inside the valve body, wherein a through flow channel is arranged in the valve body, the valve ball is installed in the flow channel through a valve stem, the valve seat is installed on the pipe wall of the flow channel through a valve seat support seat, and a combined seal is provided on the contact surface of the valve ball and the valve seat; the combined seal includes a valve seat jacket and a memory metal spring arranged in the valve seat jacket.

2. A ball valve according to claim 1, characterized in that: The valve seat jacket comprises a sealing base and a sealing lip, a memory metal spring is arranged in the sealing lip, and the inclination angle between the bottom plane of the sealing base and the plane of the jacket is 30-60 degrees.

3. A ball valve according to claim 2, characterized in that: The inclination angle between the bottom plane of the sealing base and the plane of the jacket is 30°, 45° or 60°.

4. A ball valve according to claim 1, characterized in that: The valve seat jacket is made of ultra-high molecular polyethylene material.

5. A ball valve according to claim 1, characterized in that: The memory metal spring is an O-shaped spring with a helical reverse double-layer structure.

6. A ball valve according to claim 5, characterized in that: The diameter of the O-shaped spring is 2.8 mm to 6.35 mm.

7. A ball valve according to claim 1, characterized in that: The flow channel in the valve body is a two-way, three-way or four-way structure.

8. A ball valve according to claim 1, characterized in that: The valve ball is installed at the intersection center of the flow channels of the three-way or four-way structure, and the valve seat is installed on the pipe walls of each flow channel at the intersection of the flow channels.

9. A ball valve according to claim 1, characterized in that: The combined sealing element is installed on the valve seat.

10. A ball valve according to claim 1, characterized in that: The valve seat comprises a base and an energy storage spring on the base, a combined sealing component is installed on the base, and the energy storage spring is in contact with the combined sealing component.

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