Elastic hard sealing two-way butterfly valve

Abstract

The utility model discloses an elastic metal hard seal two-way butterfly valve, which structurally comprises a valve body, a movable valve seat, a valve rod, a butterfly plate, a sealing element, a filler and the like, and is mainly characterized in that the valve seat adopts a floating structure with a spring, and a butterfly plate sealing ring adopts an elastic material of which the outer part contacted with the valve seat is thinned, namely, the butterfly plate sealing ring is pressed on a table top of the butterfly plate through a pressing ring; the outward extending part can slightly elastically deform under contact force, the pressing ring is installed on another table top of the butterfly plate through a screw, and under the action of medium pressure, the movable valve seat can automatically adjust the magnitude of interference between the butterfly plate sealing ring and the movable valve seat sealing face, so that a sealing pair reaches the best sealing state, and the sealing effect is good. The sealing matching state between the butterfly plate sealing ring and the valve seat cover under the bidirectional medium pressure can be borne, the appropriate sealing specific pressure of the circumference of a sealing pair is kept, the sealing performance is good, and the butterfly valve is very suitable for the bidirectional medium working condition.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to valve technology, and specifically to a two-way butterfly valve with elastic hard sealing. Background Art

[0002] In the prior art, hard-seal butterfly valves can be categorized by their sealing structure into two types: pure metal-sealed and multi-layered. Pure metal-sealed butterfly valves rely on a perfect fit between the valve seat and the disc seal ring on the valve body when the valve is closed to achieve a secure seal. Their main drawbacks are: the valve seat material is susceptible to fatigue and wear during frequent opening and closing, failing to achieve a perfect seal. Under high-temperature conditions, the valve seat is prone to annealing and deformation, also failing to meet sealing requirements. The valve seal pair is a surface seal, requiring extremely high processing requirements, significantly limiting its service life and range. In contrast, the multi-layered butterfly valve's disc seal pair is constructed of alternately bonded metal and rubber asbestos. When the disc is open, the medium's flow rate erodes the rubber asbestos, degrading the valve's sealing performance over time. Consequently, both butterfly valve structures suffer from unreliable sealing performance and a short service life. Therefore, an improved technology is urgently needed to address these issues in the prior art. Utility Model Content

[0003] The purpose of the utility model is to provide a two-way butterfly valve with an elastic hard seal, which adopts an elastic butterfly plate sealing ring structure with a sealing gasket. When the sealing surface of the butterfly valve is worn, the elastic deformation of the sealing gasket can adjust the matching of the sealing surface of the butterfly plate sealing ring to achieve a sealing fit with the sealing surface of the movable valve seat again, thereby extending the service life of the product and solving the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a two-way butterfly valve with elastic hard sealing, comprising a valve body, a valve stem, a butterfly plate, a butterfly plate sealing ring, a movable valve seat, a packing gland and a turbine box, wherein an axis groove is provided in the middle position of the lower portion of the valve body, an end cover is provided at the bottom of the valve body and located at the axis groove, a packing groove is opened in the middle position of the upper portion of the valve body, packing is provided in the packing groove, a packing gland is provided at the top of the valve body and located at the packing groove, the packing gland is pressed on the packing, a turbine box is provided at the top of the packing gland, the turbine box is cooperated with the top of the valve stem, the valve stem passes through the packing gland, the packing and the valve body and is rotatably arranged at the bottom in the axis groove, a left flow channel and a right flow channel are provided inside the valve body, a limiting annular boss is provided on the inner wall of the valve body and located at the right flow channel, a movable valve seat is provided in the right flow channel and located on the left side of the limiting annular boss, and the movable valve seat is close to one side of the limiting annular boss The cam is secured to the valve body with an angular channel formed between a channel and a cam face, and the channel is locked with a check valve in the channel. The cam face has an angular channel formed between a channel and a cam face, and the channel is locked with a check valve in the channel. The cam face has a cam face, and the channel is locked with a check valve in the channel.

[0005] Preferably, the utility model provides an elastic hard-sealed bidirectional butterfly valve, wherein a plurality of annular grooves are provided on the outer edge of the movable valve seat and along the circumferential direction, an O-ring is provided in the annular groove on the outer edge of the movable valve seat, and the O-ring is tightly connected to the corresponding position of the inner wall of the valve body.

[0006] Preferably, the utility model provides a bidirectional butterfly valve with elastic hard sealing, wherein a split ring is further provided in the shaft groove at the lower part of the valve body, and the bottom of the valve stem is rotatably engaged with the split ring.

[0007] Preferably, the utility model provides an elastic hard-sealed bidirectional butterfly valve, wherein the valve stem is fastened to the butterfly plate by bolts.

[0008] Preferably, the utility model provides an elastic hard-sealed bidirectional butterfly valve, wherein flanges are provided at both ends of the valve body.

[0009] Preferably, the utility model provides a two-way butterfly valve with elastic hard seal, wherein the outer diameter of the butterfly plate at the groove is smaller than the inner diameter of the butterfly plate sealing ring.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] The butterfly plate sealing ring adopts a floating elastic structure through the sealing gasket and the movable valve seat adopts a spring. The movable valve seat can float axially under the action of external force, and the butterfly plate sealing ring can float axially and radially under the action of external force. During the valve closing process, the butterfly plate sealing ring can automatically squeeze to the position where the circumferential sealing pressure is smaller, automatically adjust the circumferential sealing pressure of the sealing surface to be uniform, and maintain the seal. When the valve is open, under the action of medium pressure and elastic deformation of the sealing gasket, the movable valve seat can automatically adjust the interference between it and the butterfly plate sealing ring through the spring. When the sealing surface of the butterfly valve is worn, due to the elastic deformation of the sealing gasket, the sealing surface of the butterfly plate sealing ring can be adjusted to meet the sealing surface of the movable valve seat again, thereby extending the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the utility model;

[0013] Figure 2 For attachment Figure 1 The enlarged structural diagram at the mark A in the middle;

[0014] Figure 3 This is a schematic diagram of the front view structure of the butterfly plate sealing ring;

[0015] Figure 4 It is a schematic diagram of the cross-sectional structure of the butterfly plate sealing ring.

[0016] In the figure: valve body 1, valve stem 2, butterfly plate 3, butterfly plate sealing ring 4, movable valve seat 5, packing gland 6, turbine box 7, shaft groove 8, end cover 9, packing 10, left flow channel 11, right flow channel 12, limiting annular boss 13, spring 14, groove 15, pressure ring 16, sealing gasket 17, O-ring 18, split ring 19, flange 20. DETAILED DESCRIPTION

[0017] The following will be combined with the embodiments and drawings of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0018] It should be noted that, in the description of the present invention, the terms "inside", "outside", "up", "down", "both sides", "one end", "the other end", "left", "right", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the present invention.

[0019] See also Figure 1-4The utility model provides a technical solution: a two-way butterfly valve with elastic hard sealing, including a valve body 1, a valve stem 2, a butterfly plate 3, a butterfly plate sealing ring 4, a movable valve seat 5, a stuffing gland 6 and a turbine box 7. A shaft groove 8 is provided in the middle position of the lower part of the valve body 1, and an end cover 9 is provided at the bottom of the valve body 1 and located at the shaft groove 8. A stuffing groove is provided in the middle position of the upper part of the valve body 1, and a stuffing 10 is provided in the stuffing groove. A stuffing gland 6 is provided at the top of the valve body 1 and located at the stuffing groove. The stuffing gland 6 is pressed on the stuffing 10, and a turbine box 7 is provided at the top of the stuffing gland 6. The turbine box 7 is matched with the top end of the valve stem 2. The valve stem 2 passes through the stuffing gland 6, the stuffing 10 and the valve body 1 and the bottom is rotatably provided in the shaft groove 8 In the shaft groove 8 at the lower part of the valve body 1, a split ring 19 is also provided in the shaft groove 8. The bottom of the valve stem 2 rotates with the split ring 19. The split ring 19 is used to ensure the stability of the bottom of the valve stem 2. A left flow channel 11 and a right flow channel 12 are provided inside the valve body 1. A limited annular boss 13 is provided on the inner wall of the valve body 1 and located on the right flow channel 12. A movable valve seat 5 is provided in the right flow channel 12 and on the left side of the limited annular boss 13. The outer edge of the movable valve seat 5 is provided with a plurality of annular grooves along the circumferential direction. An O-ring 18 is provided in the annular groove on the outer edge of the movable valve seat 5. The O-ring 18 is tightly connected to the corresponding position of the inner wall of the valve body 1, and the connection between the outer edge of the movable valve seat 5 and the valve body 1 is ensured by the O-ring 18. In order to improve the sealing performance, a number of spring jacks are evenly arranged along the circumferential direction on one side of the movable valve seat 5 close to the limiting annular boss 13. A spring 14 is arranged in the spring jack of the movable valve seat 5. One end of the spring 14 is supported on the left surface of the limiting annular boss 13 away from the movable valve seat 5. The valve stem 2 is also passed through the butterfly plate 3 and is fastened to the butterfly plate 3. The valve stem 2 is fastened to the butterfly plate 3 by bolts to realize the connection and disassembly of the butterfly plate 3 and the valve stem 2. The butterfly plate 3 is rotatably arranged in the valve body 1. A groove 15 is arranged on the periphery of the butterfly plate 3 close to the right flow channel 12. The butterfly plate sealing ring 4 is arranged in the groove 15 on the periphery of the butterfly plate 3. The outer diameter of the butterfly plate 3 at the groove 15 is smaller than the inner diameter of the butterfly plate sealing ring 4. The butterfly plate sealing ring 4 is located in the radial direction to achieve a certain floating amount. A pressure ring 16 is also provided on the side of the butterfly plate 3 near the right flow channel 12 through bolts. The butterfly plate sealing ring 4 is pressed between the pressure ring 16 and the butterfly plate 3. A sealing gasket 17 is clamped at the connection between the butterfly plate 3 and the butterfly plate sealing ring 4. The outer edge of the butterfly plate sealing ring 4 is tightly attached to the inner wall of the movable valve seat 5. The inner wall of the movable valve seat 5 is an oblique conical surface. The inner diameter of the movable valve seat 5 gradually decreases from left to right. The outer edge of the butterfly plate sealing ring 4 is an oblique conical surface. The outer diameter of the butterfly plate sealing ring 4 gradually decreases from left to right. The oblique conical surface of the outer edge of the butterfly plate sealing ring 4 matches the inner wall of the movable valve seat 5. Flanges 20 are provided at both ends of the valve body 1 to achieve connection with the pipeline.

[0020] Assembly method and operating principle: First, put the butterfly plate sealing ring 4 and sealing gasket 17 on the corresponding side of the butterfly plate 3, with the sealing gasket 17 located between the butterfly plate sealing ring 4 and the butterfly plate 3. Then, connect the pressure ring 16 to the butterfly plate 3 with bolts, and press the butterfly plate sealing ring 4 between the butterfly plate 3 and the pressure ring 16 through the pressure ring 16. Then, insert the spring 14 into each spring insertion hole of the movable valve seat 5, and then put the O-ring 18 into the annular groove on the outer periphery of the movable valve seat 5. Then, put the movable valve seat 5 into the valve body 1 from the left flow channel 11 and move it to the right flow channel 12. Then, put the butterfly plate 3 into the valve body 1 from the left flow channel 11 and move it to the right flow channel 12. At the same time, apply pressure to press the pressure ring 16 against the movable valve seat 5. Place the packing 10 into the packing groove on the upper part of the valve body 1, then install the packing gland 6 on the top of the valve body 1 with bolts and press the packing 10, and pass the valve stem 2 connected to the turbine box 7 from top to bottom through the packing gland 6, packing 10, valve body 1 and butterfly plate 3 until the bottom of the valve stem 2 is inserted into the shaft groove 8 and matched with the split ring 19. The split ring 19 is limited to the bottom of the shaft groove 8, align the holes and connect the valve stem 2 and butterfly plate 3 with bolts, and install the end cover 9 at the same time to complete the assembly. An elastically deformable sealing gasket 17 is provided between the butterfly plate sealing ring 4 and the butterfly plate 3, and the elastic sealing gasket 17 is composed of the butterfly plate sealing ring 4 pressed onto the outer side of the butterfly plate 3 through the pressing ring 16, so the butterfly plate sealing ring 4 has a certain amount of floating in both radial and axial directions. The movable valve seat 5 is in contact with the limiting annular boss 13 of the valve body 1 by a spring 14 installed therein. In addition, one side of the movable valve seat 5 is limited by the valve stem 2. When the valve is closed, the movable valve seat 5 fits tightly against the butterfly plate sealing ring 4, maintaining a seal under the pressure of the medium and the elastic pressure. When the valve is opened, the movable valve seat 5 moves toward the valve stem 2 under the force of the spring 14, maintaining a certain amount of movement. The inner sealing surface of the movable valve seat 5 is an oblique conical surface, and the outer edge of the butterfly plate sealing ring 4 has an oblique conical sealing surface with the same angle. The oblique conical surface of the sealing surface of the movable valve seat 5 and the oblique conical surface of the butterfly plate sealing ring 4 are sealed with an anastomosing fit. The floating amount of the butterfly plate sealing ring 4 ensures that the sealing surfaces are completely aligned. The utility model has a reasonable structure. The butterfly plate sealing ring 4 adopts a floating elastic structure through the sealing gasket 17 and the movable valve seat 5 through the spring 14. The movable valve seat 5 can float axially under the action of external force, and the butterfly plate sealing ring 4 can float axially and radially under the action of external force. During the valve closing process, the butterfly plate sealing ring 4 can automatically be squeezed to a position where the circumferential sealing pressure is small, automatically adjust the circumferential sealing pressure of the sealing surface to be uniform, and maintain the seal. When the valve is in the open state, under the action of the medium pressure and the elastic deformation of the sealing gasket 17, the movable valve seat 5 can automatically adjust the interference between it and the butterfly plate sealing ring 4 through the spring 14. When the sealing surface of the butterfly valve is worn, due to the elastic deformation of the sealing gasket 17, the cooperation of the sealing surface of the butterfly plate sealing ring can be adjusted to achieve a sealing fit with the sealing surface of the movable valve seat 5, thereby extending the service life of the product.

[0021] Anything not described in detail in the present invention is well known to those skilled in the art.

[0022] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified and replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A two-way butterfly valve with elastic hard seal, characterized by: The invention comprises a valve body (1), a valve stem (2), a butterfly plate (3), a butterfly plate sealing ring (4), a movable valve seat (5), a stuffing gland (6) and a turbine box (7); an axial groove (8) is provided at the middle position of the lower part of the valve body (1); an end cover (9) is provided at the bottom of the valve body (1) and located at the axial groove (8); a stuffing groove is provided at the middle position of the upper part of the valve body (1); a stuffing gland (6) is provided at the top of the valve body (1) and located at the stuffing groove; the stuffing gland (6) is pressed on the stuffing (10); a turbine box (7) is provided at the top of the stuffing gland (6) ), the turbine box (7) is connected with the top of the valve stem (2), the valve stem (2) passes through the packing gland (6), the packing (10) and the valve body (1) and the bottom is rotatably arranged in the shaft groove (8), the valve body (1) is provided with a left flow channel (11) and a right flow channel (12), the valve body (1) is provided with a limiting annular boss (13) on the inner wall of the right flow channel (12), the right flow channel (12) is provided with a movable valve seat (5) and is provided on the left side of the limiting annular boss (13), and the movable valve seat (5) is evenly provided with a plurality of valves along the circumferential direction on the side close to the limiting annular boss (13). A plurality of spring jacks, a spring (14) is provided in the spring jack of the movable valve seat (5), and one end of the spring (14) away from the movable valve seat (5) is supported on the left side surface of the limiting annular boss (13), the valve stem (2) is also passed through the butterfly plate (3) and is fastened to the butterfly plate (3), the butterfly plate (3) is rotatably provided in the valve body (1), the outer periphery of the butterfly plate (3) close to the right flow channel (12) is provided with a groove (15), the butterfly plate sealing ring (4) is provided in the groove (15) on the outer periphery of the butterfly plate (3), and the butterfly plate (3) close to the right flow channel (12) is also provided with a bolt. The butterfly plate sealing ring (4) is pressed between the pressing ring (16) and the butterfly plate (3); a sealing gasket (17) is provided at the connection between the butterfly plate (3) and the butterfly plate sealing ring (4); the outer edge of the butterfly plate sealing ring (4) is in close contact with the inner wall of the movable valve seat (5); the inner wall of the movable valve seat (5) is an oblique conical surface; the inner diameter of the movable valve seat (5) decreases gradually from left to right; the outer edge of the butterfly plate sealing ring (4) is an oblique conical surface; the outer diameter of the butterfly plate sealing ring (4) decreases gradually from left to right; the oblique conical surface of the outer edge of the butterfly plate sealing ring (4) matches the inner wall of the movable valve seat (5).

2. The elastic hard-sealed bidirectional butterfly valve according to claim 1, characterized in that: The outer edge of the movable valve seat (5) is provided with a plurality of annular grooves along the circumferential direction. An O-ring (18) is provided in the annular groove on the outer edge of the movable valve seat (5). The O-ring (18) is tightly connected to the corresponding position of the inner wall of the valve body (1).

3. The elastic hard-sealed bidirectional butterfly valve according to claim 1, characterized in that: A split ring (19) is also provided in the shaft groove (8) at the lower part of the valve body (1), and the bottom of the valve stem (2) is rotatably matched with the split ring (19).

4. The elastic hard-sealed bidirectional butterfly valve according to claim 1, characterized in that: The valve stem (2) is fastened to the butterfly plate (3) via bolts.

5. The elastic hard-sealed bidirectional butterfly valve according to claim 1, characterized in that: Flanges (20) are provided at both ends of the valve body (1).

6. The elastic hard-sealed bidirectional butterfly valve according to claim 1, characterized in that: The outer diameter of the butterfly plate (3) at the groove (15) is smaller than the inner diameter of the butterfly plate sealing ring (4).

Images