Butterfly valve with automatic compensation valve seat
The combination of a floating valve seat and a lip seal, combined with a four-open ring and a limit structure, solves the problem of poor sealing performance of traditional butterfly valves in low-temperature environments, and achieves stability and reliability of the sealing effect under high pressure.
Patent Information
- Application Number
- CN202422879210.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-11-25
AI Technical Summary
Traditional butterfly valves have poor sealing performance in low-temperature environments and cannot effectively compensate for changes in the gap between the valve seat and the valve body caused by thermal expansion and contraction, resulting in leakage.
It adopts a combination of floating valve seat and lip sealing ring. The lip sealing ring is elastically squeezed to form a seal and automatically adjusts its position to adapt to pressure and temperature changes. The four-open ring and limit structure are combined to ensure the sealing effect.
In high pressure and low temperature environments, the sealing effect is significantly improved to prevent medium leakage, with strong adaptability, preventing the sealing ring from being out of position, and maintaining stability and reliability.
Smart Images
Figure CN223331164U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of butterfly valves, in particular to a butterfly valve with automatic valve seat compensation. Background Art
[0002] Nowadays, the application areas of cryogenic fluids are becoming increasingly extensive, such as the storage and transportation of ultra-low temperature media such as liquefied natural gas (LNG), liquid oxygen, and liquid nitrogen, and the performance requirements for valves are also becoming increasingly higher. In particular, for valves with extremely low working environment temperatures (such as -196°C), traditional sealing materials and structural designs are often difficult to meet their use requirements. Although the traditional fixed valve seat has a simple structure, under ultra-low temperature and high pressure conditions, the fitting clearance between the valve seat and the valve body will change due to the thermal expansion and contraction effect, which may cause leakage. Moreover, O-rings, as a common valve seat seal for butterfly valves, perform well under normal and high temperature conditions. However, due to the characteristics of their shape, they cannot effectively compensate for the valve seat in low temperature environments, resulting in a decrease in sealing effect and leakage of cryogenic fluids. Summary of the Invention
[0003] Purpose of the present invention: In order to overcome the defects of the prior art, the present invention provides a butterfly valve with automatic valve seat compensation, aiming to solve the problems existing in the prior art such as poor low-temperature sealing performance and insufficient adaptability to high-pressure working conditions.
[0004] The technical solution of the present utility model is as follows: the butterfly valve includes a valve seat, a valve body and a butterfly plate, the valve seat is installed in the valve body, the butterfly plate is installed with a seal, the valve seat includes a valve seat body, a pressure ring and a lip sealing ring, the valve seat body is floatingly installed on the inner wall of the valve body, the valve seat body can contact with the seal to form an inclined sealing surface, the pressure ring can be adjusted and movably installed on one axial side of the valve body and is in pressure contact with the axial direction of the valve seat body; right-angled ring grooves are respectively provided on both side edges of the valve seat body in the axial direction, the lip sealing ring is installed in the right-angled ring groove and elastically squeezes the two right-angled sides of the right-angled ring groove and the inner wall of the valve body.
[0005] By adopting the above technical solution, the lip sealing ring is sealed at the outer edge of the valve seat body, and its elastic extrusion effect can form an effective elastic seal on the seam. In addition, the combination of the floating valve seat and the lip sealing ring enables the valve seat to automatically adjust its position during long-term use. The lip sealing ring can maintain tight extrusion on the floating valve seat body, providing additional compensation for the butterfly valve under high pressure, thereby enhancing the sealing effect of the valve. In addition, the lip shape of the lip sealing ring enables it to better fit the sealing surface when under pressure, forming a tighter seal, which is particularly effective in low temperature environments because the elastic deformation of the lip part can compensate for the problem of increased hardness of the material at low temperatures.
[0006] In one possible design, the cross-section of the lip sealing ring is "C"-shaped, including an annular base and an outer sealing lip and an inner sealing lip respectively arranged on the outer side and inner side of the annular base, with a lip cavity between the outer sealing lip and the inner sealing lip; the outer sealing lip elastically squeezes the inner wall of the valve body, and the inner sealing lip and the annular base elastically squeeze the two right-angled sides of the right-angled ring groove respectively.
[0007] With the above design, when high-pressure medium enters the lip cavity, the lip cavity will expand and deform. This expansion and deformation causes the annular base, outer sealing lip and inner sealing lip to be squeezed more tightly against each corresponding surface, effectively preventing medium leakage, especially under high-pressure working conditions, and can automatically adjust its position to adapt to different pressure and temperature changes to maintain sealing contact; at the same time, the "C"-shaped lip sealing ring gives it good anti-extrusion ability. Even under high pressure, the expansion and deformation of the lip cavity can effectively prevent the sealing ring from being extruded, avoiding leakage caused by the sealing ring being out of position.
[0008] In one possible design, the pressure ring is a four-open ring, a limiting portion is convexly provided on the outer periphery of the pressure ring, a mounting groove is provided on the inner wall of the valve body, and the limiting portion is placed in the mounting groove to fix the pressure ring in the valve body; a stud is threadedly installed on the pressure ring, and the tail end of the stud presses on the front end face of the valve seat body.
[0009] With the above design, the shape of the four-open ring pressure ring is conducive to the convenient disassembly and assembly of the valve seat, and the limit part and the installation groove ensure the accurate positioning of the pressure ring and the valve seat body in the valve body. In addition, the position of the valve seat can be adjusted by adjusting the stud to adjust the degree of extrusion between the valve seat body and the butterfly plate seal, ensuring good sealing performance in high pressure and low temperature environments.
[0010] In a possible design, an annular boss is provided on the inner wall of the valve body, and the annular boss can abut against the rear end surface of the valve seat body to form a limit.
[0011] The above design can effectively limit the axial movement range of the valve seat body, prevent the valve seat body from excessive displacement under high pressure or temperature changes, help keep the valve seat body in a predetermined position, and ensure the stability and reliability of the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural diagram of a specific embodiment of the utility model;
[0013] Figure 2 For this utility model Figure 1 A partial enlarged view of point A in the middle;
[0014] Among them, 1. valve seat; 11. valve seat body; 111. right-angle ring groove; 12. pressure ring; 121. limit part; 122. stud; 13. lip sealing ring; 131. annular base; 132. outer sealing lip; 133. inner sealing lip; 134. lip cavity; 2. valve body; 21. mounting groove; 22. ring boss; 3. butterfly plate; 31. seal. DETAILED DESCRIPTION
[0015] like Figure 1 、 Figure 2The butterfly valve shown is a butterfly valve with automatic seat compensation. The butterfly valve includes a valve seat 1, a valve body 2 and a butterfly plate 3. The valve seat 1 is installed in the valve body 2. A seal 31 is installed on the butterfly plate 3. The valve seat 1 includes a valve seat body 11, a pressure ring 12 and a lip seal ring 13. The valve seat body 11 is floatingly installed on the inner wall of the valve body 2. The outer side surface of the valve seat body 11 and the inner wall of the valve body 2 can slide relative to each other. When the valve is closed, the valve seat body 11 contacts the seal 31 to form an inclined sealing surface. The pressure ring 12 can be adjusted and moved. On one axial side of the valve body 2 and in pressure contact with the axial direction of the valve seat body 11, the pressure ring 12 is used to locate the position of the valve seat body 11; the valve seat body 11 is provided with right-angled annular grooves 111 at the corner positions of the edges on both sides in the axial direction. The right-angled annular grooves 111 have two right-angled groove walls, which surround the outer edge of the valve seat body 11. The lip sealing ring 13 is installed in the corresponding right-angled annular groove 111 and elastically squeezes the two right-angled groove walls of the right-angled annular groove 111 and the inner wall of the valve body 2. The lip seal ring 13 is annular in shape, with a C-shaped cross-section through its center. It comprises an annular base 131, and outer and inner sealing lips 132, 133, respectively, located on the outer and inner sides of the base 131. The inner sealing lip 133 is located closer to the center of the lip seal ring 13 than the outer sealing lip 132, with a lip cavity 134 defined between the two lips. The outer sealing lip 132 elastically presses against the inner wall of the valve body 2, while the inner sealing lip 133 and the annular base 131 elastically press against the two right-angled sides of the right-angled annular groove 111. The annular surface of the annular base 131 is in close contact with one of the right-angled sides of the right-angled annular groove 111, with the inner and outer sealing lips 133, 132, respectively, tightly pressing against their respective corresponding surfaces. Before valve installation, the pressure ring 12 pre-adjusts the position of the valve seat body 11 to create a certain compressive force between the valve seat body 11 and the seal 31 of the butterfly disc 3, thereby ensuring a tight seal. When high-pressure medium enters the lip cavity 134, the lip cavity 134 expands and deforms, squeezing and expanding outward. Under the influence of the medium force, the outer sealing lip 132 and the inner sealing lip 133 are more tightly attached to the corresponding joint position, effectively preventing leakage. Furthermore, after the high-pressure medium enters the lip cavity 134, the annular base 131, the outer sealing lip 132, and the inner sealing lip 133 surround the lip cavity 134. The medium pressure squeezes along the inner wall of the lip cavity 134, only squeezing the outer sealing lip 132 and the inner sealing lip 133 closer to the corresponding surface without squeezing the outer sealing lip 132 or the inner sealing lip 133 out of place, thereby preventing leakage caused by the sealing ring being out of position.
[0016] The compression ring 12 is a four-ring design, consisting of four independent arcuate segments with gaps between each segment. This makes the ring easier to install and remove, eliminating the complex manipulations required of a complete ring. A stopper 121 protrudes outward from the outer periphery of the compression ring 12. The stopper 121 is positioned within a mounting groove 21 formed on the inner wall of the valve body 2 to form a locking mechanism, securing the compression ring 12 within the valve body 2. A stud 122 is threaded onto the compression ring 12, the tail end of which presses against the front end surface of the valve seat body 11. Tightening the stud 122 presses against the valve seat body 11, pushing it backward. This creates a tighter contact between the sealing surface of the valve seat body 11 and the seal 31, allowing for operation even after wear. Loosening the stud 122 allows the valve seat body 11 to have a greater range of movement, allowing for an appropriate degree of compression between the sealing surfaces of the valve seat body 11 and the seal 31.
[0017] The inner wall of the valve body 2 is provided with an annular boss 22, which abuts against the rear end surface of the valve seat body 11 to form a limit. The limiting action of the annular boss 22 limits the axial movement range of the valve seat body 11, making the valve seat body 11 more stable during operation and reducing the risk of seal failure due to displacement.
Claims
1. A butterfly valve with automatic valve seat compensation, comprising a valve seat (1), a valve body (2) and a butterfly plate (3), wherein the valve seat (1) is installed in the valve body (2), and a sealing member (31) is installed on the butterfly plate (3), characterized in that: The valve seat (1) includes a valve seat body (11), a pressure ring (12) and a lip seal ring (13). The valve seat body (11) is floatingly installed on the inner wall of the valve body (2). The valve seat body (11) can contact the sealing member (31) to form an inclined sealing surface. The pressure ring (12) can be adjusted and moved to be installed on one axial side of the valve body (2) and press-contact with the valve seat body (11) in the axial direction. The two side edges of the valve seat body (11) in the axial direction are respectively provided with right-angled ring grooves (111). The lip seal ring (13) is installed in the right-angled ring groove (111) and elastically squeezes the two right-angled sides of the right-angled ring groove (111) and the inner wall of the valve body (2).
2. The butterfly valve with automatic seat compensation according to claim 1, characterized in that: The cross section of the lip seal ring (13) is C-shaped, comprising an annular base (131) and an outer sealing lip (132) and an inner sealing lip (133) respectively arranged on the outer side and the inner side of the annular base (131), wherein a lip cavity (134) is provided between the outer sealing lip (132) and the inner sealing lip (133); the outer sealing lip (132) elastically squeezes the inner wall of the valve body (2), and the inner sealing lip (133) and the annular base (131) elastically squeeze the two right-angled sides of the right-angled annular groove (111).
3. The butterfly valve with automatic valve seat compensation according to claim 1 or 2, characterized in that: The pressure ring (12) is a four-open ring, and a limiting portion (121) is convexly provided on the outer periphery of the pressure ring (12). A mounting groove (21) is provided on the inner wall of the valve body (2), and the limiting portion (121) is placed in the mounting groove (21) to fix the pressure ring (12) in the valve body (2); a stud (122) is threadedly installed on the pressure ring (12), and the tail end of the stud (122) presses against the front end surface of the valve seat body (11).
4. The butterfly valve with automatic valve seat compensation according to claim 1 or 2, characterized in that: An annular boss (22) is provided on the inner wall of the valve body (2), and the annular boss (22) can abut against the rear end surface of the valve seat body (11) to form a limit.