Butterfly valve suitable for high-temperature working condition

Abstract

The utility model discloses a butterfly valve suitable for a high-temperature working condition. The butterfly valve comprises a valve body and a valve rod, a positioning disc is connected to a connecting plate at the top of the valve body through a bolt, a butterfly plate is arranged in the valve body, a valve seat is arranged between the butterfly plate and the valve body, a check ring is arranged on the outer side of the valve seat, a valve seat limiting table is arranged at the bottom of the valve body, and an elastic U-shaped ring is arranged on the back face of the valve seat. The thickness of the butterfly plate is increased, and the inclination of the outer rotation surface, making contact with the valve seat, of the butterfly plate is controlled to range from 10 degrees to 17 degrees; two lead sealing pieces welded in an inclined pulling mode are arranged on the peripheral face of the joint of the positioning disc and the connecting plate, and the inclined pulling direction of each lead sealing piece is consistent with the closing direction of the handle from the fixing point on the connecting plate to the fixing point on the positioning disc. According to the butterfly valve, the situation that the butterfly plate bites a pad in the opening and closing process due to the fact that the valve seat expands and deforms due to temperature rise under the high-temperature working condition is avoided, in addition, the strength of the positioning disc connected with the handle is enhanced, the positioning disc is prevented from loosening, leakage of the butterfly valve is prevented, and the high-temperature-resistant effect is remarkable.

Description

Technical Field

[0001] The utility model belongs to a butterfly valve, and particularly relates to a high-temperature butterfly valve for a tank body or a tank truck for transporting chemical mediums with higher temperatures. Background Art

[0002] Generally, in a butterfly valve, the contact surface between the butterfly plate and the valve seat is relatively small during the opening and closing process. Especially when transporting high-temperature media, the valve seat may undergo some physical property changes due to temperature rise. When opening and closing the butterfly valve, since the contact surface between the butterfly plate and the valve seat is relatively small during the opening and closing process, it may cause the valve seat to deform and bite, ultimately resulting in valve leakage.

[0003] The existing butterfly valve relies on the butterfly plate and the valve seat for sealing. During the rotation process of the butterfly plate when opening and closing, the valve seat will be extruded. If under high-temperature working conditions, the valve seat is prone to temperature rise, expansion, and deformation, making the expanded sealing part of the valve seat more likely to invade the rotation space of the butterfly plate, thereby causing the situation of biting the gasket during the opening and closing process of the butterfly plate, resulting in butterfly valve leakage and affecting the service life of the butterfly valve. Summary of the Utility Model

[0004] In view of the above-mentioned prior art, the utility model provides a butterfly valve applicable to high-temperature working conditions. Under high-temperature working conditions, it can avoid the situation that the butterfly plate bites the gasket during the opening and closing process due to the temperature rise, expansion, and deformation of the valve seat. In addition, the strength of the positioning disk connected to the handle is strengthened, avoiding the loosening of the positioning disk, preventing the leakage of the butterfly valve. The utility model has a remarkable high-temperature resistance effect, and the service life of the valve seat and the switching feel are significantly improved. It is more stable and reliable during long-term use, and the overall valve body is more firm.

[0005] To solve the above technical problems, a butterfly valve applicable to high-temperature working conditions proposed by the utility model includes a valve body, a valve stem, and a handle. A connecting plate is provided at the top of the valve body. A positioning disk is connected to the connecting plate by bolts. A butterfly plate is arranged inside the valve body. A valve seat is arranged between the butterfly plate and the valve body. A retaining ring is arranged outside the valve seat. A stepped surface is arranged inside the inlet of the valve body. A valve seat limiting platform is arranged at the bottom of the valve body. A U-shaped groove is arranged on the back of the valve seat, and a U-shaped ring is filled in the U-shaped groove. The distance between the butterfly plate and the inner end face of the retaining ring is 2-3 mm. The slope of the outer rotary surface of the butterfly plate in contact with the valve seat is 10-17°, so as to increase the sealing surface area between the valve seat and the butterfly plate. Two lead sealing sheets welded obliquely are arranged on the outer peripheral surface of the joint between the positioning disk and the connecting plate. The oblique pulling direction of each lead sealing sheet is from the fixed point on the connecting plate to the fixed point on the positioning disk and is consistent with the closing direction of the handle, thereby improving the connection strength between the positioning disk and the connecting plate.

[0006] Furthermore, for the butterfly valve of the utility model, wherein:

[0007] The valve seat is located within the space formed by the retaining ring, the valve body, and the butterfly plate. The outer surface of the valve seat is in close contact with the retaining ring and the U-shaped ring, and the inner surface of the valve seat is in close contact with the stepped surface and the valve seat limiting platform on the valve body. When the butterfly valve is in the normally open state, the valve seat limiting platform is used to prevent the valve seat from extending and warping outwards.

[0008] The U-shaped ring is made of an elastic material. When the butterfly plate compresses the valve seat, the U-shaped ring provides elastic compensation to the valve seat.

[0009] The valve seat can be made of a high-temperature resistant PTFE-based composite material.

[0010] Two lead seal pieces are respectively arranged on the left and right sides of the outer peripheral surface of the joint between the positioning disk and the connecting plate. The angle of the diagonal welding of the lead seal pieces is 45° relative to the axis.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] (1) Within the installation space of the butterfly plate, the thickness of the butterfly plate is widened as much as possible. For example, usually, the distance between the butterfly plate and the inner end face of the retaining ring is 3 - 6 mm. Without changing the dimensions of components such as the valve body, valve stem, and retaining ring, the present utility model only controls the distance between the butterfly plate and the inner end face of the retaining ring within 2 - 3 mm, thereby thickening the butterfly plate. At the same time, by reducing the slope between the outer rotating surface of the butterfly plate and the valve seat, the sealing surface between the valve seat and the butterfly plate becomes larger. Under the elastic compensation of the U-shaped ring to the valve seat, the sealing effect is further improved;

[0013] (2) Through the valve seat limiting platform designed inside the valve body, its function is to prevent the valve seat from deforming by extending inwards during the heat expansion process of the valve seat, thereby maintaining the fitting state between the valve seat and the butterfly plate. If the valve seat extends and deforms inwards, it is likely to invade the rotation space of the butterfly plate, resulting in the situation of the butterfly plate biting the gasket and accelerating the damage of the valve seat. Therefore, adding the valve seat limiting platform can better adapt to the use in high-temperature environments.

[0014] (3) Two groups of lead seal pieces are strengthened between the connecting plate at the top of the valve body and the positioning disk of the handle to increase the connection strength between the positioning disk and the valve body and prevent the positioning disk from rotating during the opening and closing process, which may affect the proper opening and closing of the butterfly plate.

[0015] (4) It is recommended to use a high-temperature resistant PTFE-based composite material for the material of the valve seat, and the specific type selected is not limited. Description of the Drawings

[0016] Figure 1-1 is a structural cross-sectional view of a butterfly valve in the prior art;

[0017] Figure 1-2 is Figure 1-1 the enlarged view of the partial structure shown in part A;

[0018] Figure 2-1 is the structural cross-sectional view of the butterfly valve of the present utility model applicable to high-temperature working conditions;

[0019] Figure 2-2 is Figure 2-1 the enlarged view of the partial structure shown in part B;

[0020] Figure 2-3 is the top view of the butterfly valve of the present utility model applicable to high-temperature working conditions;

[0021] Figure 2-4 is the perspective view of one angle of the butterfly valve of the present utility model applicable to high-temperature working conditions;

[0022] Figure 2-5 is Figure 2-4 the perspective view of another angle of the shown butterfly valve.

[0023] In the figure:

[0024] 1 - butterfly plate, 2 - valve seat, 3 - valve body, 31 - valve seat limit platform

[0025] 4 - U-shaped ring, 51 - first lead seal piece, 52 - second lead seal piece, 6 - positioning disc

[0026] 61 - first limit plate, 7 - valve stem, 71 - handle, 72 - second limit plate

[0027] 8 - connecting bolt, 9 - retaining ring, 10 - connecting plate Specific embodiments

[0028] The design concept of the butterfly valve of the present utility model applicable to high-temperature working conditions is: under high-temperature working conditions, the butterfly plate of the butterfly valve (as shown in Figure 2-1 and Figure 2-2 shown) relative to the butterfly plate under normal working conditions (as shown in Figure 1-1 and Figure 1-2As shown in the figure, by thickening the butterfly plate 1 and reducing the slope of the outer rotating surface of the side of the butterfly plate 1 in contact with the valve seat 2, the sealing surface area between the butterfly plate 1 and the valve seat 2 is increased. As a result, during the opening and closing movement of the butterfly plate 1, the contact surface between the butterfly plate 1 and the valve seat 2 becomes larger. The elastic U-shaped ring 4 provided on the back of the valve seat 2 can provide elastic compensation to the valve seat 2 when the butterfly plate 1 compresses the valve seat 2. In the present invention, in order to limit the tendency of the valve seat 2 (made of PTFE material) to gradually extend and warp inward due to the pressure of the fixing bolts in the normally open state of the butterfly valve, and to avoid the situation of the butterfly plate biting the gasket and accelerating the damage of the valve seat, a valve seat limiting platform 31 is added inside the valve body 3. During the thermal expansion process of the valve seat 2, it can prevent the valve seat 2 from deforming by extending inward, so as to maintain the fitting state between the valve seat 2 and the butterfly plate 1 and ensure the normal operation of the butterfly valve. To increase the strength of the positioning disc 6, lead seal pieces 51 and 52 are added at the joint between the positioning disc 6 and the top of the valve body 3, as Figure 2-4 and Figure 2-5 shown.

[0029] The following further describes the present invention in conjunction with the accompanying drawings and specific embodiments, but the following embodiments are by no means any limitation to the present invention.

[0030] A butterfly valve applicable to high-temperature working conditions proposed by the present invention, such as Figure 2-1 , Figure 2-2 , Figure 2-3 , Figure 2-4 and Figure 2-5As shown, the butterfly valve includes a valve body 3, a valve stem 7 and a handle 71. A butterfly plate 1 is provided inside the valve body 3. A valve seat 2 is provided between the butterfly plate 1 and the valve body 3. A retaining ring 9 is provided outside the valve seat 2. The distance between the inner end face of the retaining ring 9 and the butterfly plate 1 is 2 - 3 mm. The slope of the outer rotary surface of the butterfly plate 1 in contact with the valve seat 2 is 10 - 17°, so as to increase the area of the sealing surface between the valve seat 2 and the butterfly plate 1. In this embodiment, the distance between the inner end face of the retaining ring 9 and the butterfly plate 1 is 2.5 mm, and the slope of the outer rotary surface of the butterfly plate 1 in contact with the valve seat 2 is 15°. The valve seat 2 is made of high-temperature-resistant PTFE or PTFE-based composite material. A stepped surface is provided inside the inlet of the valve body 3. A valve seat limiting platform 31 is provided at the bottom of the valve body 3. The valve seat limiting platform 31 is a ring of limiting platform added at the through diameter of the valve body 3. When the valve seat 2 is installed, it is used to position the inner bottom surface of the front end of the valve seat 2, and to limit the tendency of the valve seat 2 to gradually extend and warp outwards due to the pressure of the fixing bolts in the normally open state of the butterfly valve. At the same time, the butterfly plate increases elastic compensation. A U-shaped groove is provided on the back of the valve seat 2, and a U-shaped ring 4 is filled in the U-shaped groove; the U-shaped ring 4 is made of an elastic material, and the U-shaped ring has an elastic function. The U-shaped ring is embedded in the valve seat groove to increase the elasticity of the valve seat; when the butterfly plate 1 compresses the valve seat 2, the U-shaped ring 4 provides elastic compensation for the valve seat 2. The valve seat 2 is located in the space formed by the retaining ring 9, the valve body 3 and the butterfly plate 1. The outer surface of the valve seat 2 is in close contact with the retaining ring 9 and the U-shaped ring 4, and the inner surface of the valve seat 2 is in close contact with the stepped surface and the valve seat limiting platform 31 on the valve body 3. In the normally open state of the butterfly valve, the valve seat limiting platform 31 is used to limit the valve seat 2 from extending and warping outwards.

[0031] A connecting plate 10 is provided at the top of the valve body 3. A positioning disk 6 is connected to the connecting plate 10 by bolts. A first closing limiting plate 61 is provided on the positioning disk 6. A second closing limiting plate 72 is provided on the handle 71. Rotate the handle in the direction indicated by the arrow in Figure 2-3 . When closing, it can be closed in place by relying on the first closing limiting plate 61 and the second closing limiting plate 72. In the present utility model, two obliquely welded lead seal pieces are provided on the outer peripheral surface at the joint of the positioning disk 6 and the connecting plate 10. The two lead seal pieces are respectively arranged on the left and right sides of the outer peripheral surface at the joint of the positioning disk 6 and the connecting plate 10. The oblique pulling direction of each lead seal piece is from the fixed point on the connecting plate to the fixed point on the positioning disk, which is consistent with the closing direction of the handle 71, as shown in Figure 2-4 and Figure 2-5As shown, the connection strength between the positioning disk 6 and the connecting plate 10 is thus improved. In this embodiment, the angle of the diagonal welding of the lead seal piece 5 is 45° relative to the axial direction. In the present utility model, through two lead seal pieces 51 and 52, it is prevented that the positioning disk 6 becomes loose due to manual violent operation, so that the butterfly valve passes and the valve leaks; in this embodiment, the number of lead seal pieces 5 is two, and the reinforcement of the positioning disk 6 is to add one lead seal piece between the positioning disk 6 and the connecting plate on each of the left and right sides of the positioning disk 6. The lead seal piece 5 is welded at a 45-degree diagonal angle, and the direction is along the closing direction of the butterfly valve handle. The function of the two groups of lead seal pieces 51 and 52 is to further fix the positioning disk 6 and the valve body 3 on the basis of the two groups of connecting bolts 8, preventing the positioning disk 6 from rotating during the operation of the handle, and preventing the situation that the handle and the butterfly plate 1 cannot be rotated in place.

[0032] When the rotary handle 71 is rotated to close, since the operator may perform violent operation because he is afraid that it cannot be closed tightly, when the torque of the handle 71 is too large, the first and second closing limit plates 61 and 72 will collide and be subjected to excessive force, resulting in the situation that the positioning disk 6 fixed only by the two groups of connecting bolts 8 rotates relative to the valve body 3. Once the positioning disk 6 and the valve body 3 are misaligned, it will cause the butterfly plate 1 to exceed the closing position after closing, resulting in the situation that the valve cannot be closed tightly and leaks and the gasket is damaged. Therefore, a group of diagonally welded lead seal pieces 51 and 52 are added to each side of the connecting plate 10 at the top of the positioning disk 6 and the valve body 3. The diagonal pulling directions of the two lead seal pieces are the same as the closing direction of the handle 71 from the fixed point on the connecting plate 10 to the fixed point on the positioning disk 6, that is, to be consistent with the misalignment direction when the positioning disk 6 and the connecting plate 10 are misaligned, so as to improve the connection strength between the positioning disk and the connecting plate. In addition, when using and maintaining the butterfly valve, the states of the lead seal pieces 51 and 52 can be checked in time, so as to more intuitively determine whether the closing position of the valve is accurate. Once the lead seal piece is welded open, it means that a misalignment situation has occurred, and maintenance needs to be carried out in time to prevent further damage to the valve.

[0033] In summary, compared with ordinary butterfly valves, the butterfly valve of the present utility model applicable to high-temperature working conditions has a remarkable high-temperature resistance effect, and the service life of the valve seat is significantly improved, and it is more stable and reliable during long-term use and is more firm as a whole.

[0034] Although the present utility model has been described above in conjunction with the accompanying drawings, the present utility model is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present utility model, those of ordinary skill in the art can also make many improvements and changes without departing from the purpose of the present utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A butterfly valve suitable for high temperature working conditions, comprising a valve body (3), a valve stem (7) and a handle (71), wherein a connecting plate (10) is provided on the top of the valve body (3), a positioning plate (6) is connected to the connecting plate (10) by bolts, a butterfly plate (1) is provided inside the valve body (3), a valve seat (2) is provided between the butterfly plate (1) and the valve body (3), a retaining ring (9) is provided on the outer side of the valve seat (2), a stepped surface is provided on the inner side of the inlet of the valve body (3), a valve seat limiting platform (31) is provided on the bottom of the valve body (3), a U-shaped groove is provided on the back side of the valve seat (2), and a U-shaped ring (4) is filled in the U-shaped groove; characterized in that The distance between the butterfly plate (1) and the inner end surface of the retaining ring (9) is 2 to 3 mm, and the inclination of the outer rotating surface of the butterfly plate (1) in contact with the valve seat (2) is 10 to 17 degrees, so as to increase the area of ​​the sealing surface between the valve seat (2) and the butterfly plate (1); The outer peripheral surface of the joint between the positioning plate (6) and the connecting plate (10) is provided with two obliquely welded lead sealing sheets, and the oblique pulling direction of each lead sealing sheet is from a fixed point on the connecting plate to a fixed point on the positioning plate, which is consistent with the closing direction of the handle (71), thereby improving the connection strength between the positioning plate (6) and the connecting plate (10).

2. The butterfly valve suitable for high temperature working conditions according to claim 1, characterized in that: The valve seat (2) is located in a space formed by the retaining ring (9), the valve body (3) and the butterfly plate (1); the outer surface of the valve seat (2) is in close contact with the retaining ring (9) and the U-shaped ring (4); the inner surface of the valve seat (2) is in close contact with the stepped surface on the valve body (3) and the valve seat limit platform (31); when the butterfly valve is in a normally open state, the valve seat limit platform (31) is used to limit the valve seat (2) from extending and warping outward.

3. The butterfly valve suitable for high temperature working conditions according to claim 1, characterized in that: The U-shaped ring (4) is made of elastic material, and when the butterfly plate (1) compresses the valve seat (2), the U-shaped ring (4) provides elastic compensation for the valve seat (2).

4. The butterfly valve suitable for high temperature working conditions according to claim 1, characterized in that: Two lead sealing sheets are respectively arranged on the left and right sides of the outer peripheral surface of the joint between the positioning plate (6) and the connecting plate (10), and the angle of the oblique welding of the lead sealing sheet (5) is 45 degrees relative to the axial direction.

5. The butterfly valve suitable for high temperature working conditions according to claim 1, characterized in that: The valve seat (2) is made of a high-temperature resistant PTFE-based composite material.

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