Bidirectional all-metal sealing high-frequency control butterfly valve

Abstract

An annular groove is formed in a valve body, a piston ring and a valve seat ring are arranged in the annular groove, a movable valve seat is arranged at the front end of the valve seat ring, the movable valve seat is matched with a butterfly plate in a conical surface hard sealing mode, and a drainage hole is formed in the bottom of the annular groove. A reverse medium enters the annular groove through the drainage hole to push the piston ring, the piston ring pushes the valve seat ring, and the valve seat ring pushes the movable valve seat, so that the movable valve seat is wedged on the sealing surface of the butterfly plate; when a medium flows in the forward direction, the downstream is a low-pressure area, the piston ring is pushed to the bottom of the annular groove, the valve seat ring and the movable valve seat are pushed by the medium to be tightly attached to the sealing face of the butterfly plate, the larger the medium pressure is, the larger the sealing force is, and the medium pressure self-sealing effect is achieved; the movable valve seat is pushed by a medium to be tightly attached to the sealing face of the butterfly plate for compensation, and therefore the whole sealing pair can keep the sealing performance of a new valve after being opened and closed at high frequency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a bidirectional full-metal sealing high-frequency control butterfly valve. BACKGROUND

[0002] The high-frequency butterfly valve is generally used in the working condition requiring frequent opening and closing, high sealing performance, high wear and erosion resistance of the sealing surface, and high opening and closing life number. At present, the high-frequency butterfly valve in the industry is generally a high-performance butterfly valve with soft sealing, but the service life is not long due to weak temperature resistance and poor wear and erosion resistance. SUMMARY In order to solve the technical defects existing in the prior art, the present application provides a bidirectional full-metal sealing high-frequency control butterfly valve.

[0003] The technical solution adopted by the present application is as follows: the bidirectional full-metal sealing high-frequency control butterfly valve comprises a valve body, a valve rod is arranged in the valve body, a butterfly plate is connected to the valve rod, an annular groove is arranged on the valve body, a piston ring and a valve seat ring are arranged in the annular groove, a movable valve seat is further arranged at the front end of the valve seat ring, the movable valve seat can move horizontally along the flow channel, the movable valve seat is in hard sealing cooperation with the wedge surface of the butterfly plate, a drainage hole is further arranged at the bottom of the annular groove, when the medium flows reversely, the piston ring is pushed by the medium entering the annular groove at the bottom of the annular groove through the drainage hole, the valve seat ring is pushed by the piston ring, and the movable valve seat is pushed by the valve seat ring, so that the movable valve seat is tightly wedged with the sealing surface of the butterfly plate.

[0004] A first O-ring is arranged between the valve seat ring and the movable valve seat, a second O-ring is arranged between the valve seat ring and the inner wall of the annular groove, the medium reaches the circular annular space between the valve seat ring and the piston ring through the gap between the movable valve seat, the valve seat ring and the valve body, and the medium pressure pushes the valve seat ring and the movable valve seat to be tightly wedged with the sealing surface of the butterfly plate.

[0005] Step structures are arranged on the valve seat ring and the movable valve seat, and a buffer washer is further arranged between the step structures.

[0006] A first anti-rotation limiting pin is further arranged between the valve seat ring and the movable valve seat.

[0007] A second anti-rotation limiting pin is arranged between the piston ring and the valve seat ring.

[0008] A third anti-rotation limiting step pin is arranged between the piston ring and the bottom of the annular groove.

[0009] The bottom of the annular groove is further provided with an adjusting screw, the adjusting screw pushes the piston ring, the valve seat ring and the movable valve seat to form an initial pre-tightening specific pressure, and the adjusting screw also solves the problem of machining precision error compensation of the hard-to-hard sealing surface.

[0010] The bottom of the valve rod is also provided with a wear-resistant pad.

[0011] The valve rod and the valve body are also provided with a wear-resistant bearing.

[0012] The valve body and the movable valve seat are also provided with a limiting block.

[0013] The beneficial effects of the present application are: the present application provides a bidirectional full-metal sealed high-frequency control butterfly valve, which comprises a valve body, a valve rod arranged in the valve body, a butterfly plate connected to the valve rod, an annular groove arranged on the valve body, a piston ring and a valve seat ring arranged in the annular groove, a movable valve seat arranged at the front end of the valve seat ring, the movable valve seat being horizontally movable along a flow channel, the movable valve seat and the butterfly plate being in hard sealing cooperation with each other, the bottom of the annular groove being further provided with a drainage hole, when the medium flows reversely, the upstream is a low-pressure area, the reverse medium enters the annular groove through the drainage hole to push the piston ring, the piston ring pushes the valve seat ring, the valve seat ring pushes the movable valve seat, and the movable valve seat is wedged against the sealing surface of the butterfly plate; when the medium flows forwardly, the downstream is a low-pressure area, the piston ring is pushed to the bottom of the annular groove, the valve seat ring and the movable valve seat are pushed by the medium to tightly adhere to the sealing surface of the butterfly plate, the greater the medium pressure, the greater the sealing force, and the effect of self-sealing of the medium pressure is formed, the sealing surfaces of the movable valve seat and the butterfly plate are metal hard sealing surfaces, the movable valve seat is movable, and the movable valve seat tightly adheres to the sealing surface of the butterfly plate for compensation under the pushing of the medium, so that the entire sealing pair can also maintain the sealing performance of a new valve after high-frequency switching. The movable valve seat and the limiting block arranged on the valve body have a certain gap E, the gap E is set according to the number of switching service life of the valve, the wear resistance of the sealing surface material, the pressure difference of the working condition of the valve, the switching frequency requirement of the process pipeline and the system maintenance cycle, etc. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present application.

[0015] Figure 2 It is a sealing structure schematic diagram of the present application.

[0016] Figure 3 It is a local structure schematic diagram of the sealing principle of the present application.

[0017] 1-valve body, 2-valve rod, 3-butterfly plate, 4-piston ring, 5-valve seat ring, 6-movable valve seat, 7-first O-ring, 8-second O-ring, 9-buffer ring, 10-wear-resistant pad, 11-annular groove, 12-drainage hole, 13-first anti-rotation limiting pin, 14-second anti-rotation limiting pin, 15-adjusting screw, 16-third anti-rotation limiting stepped pin, 17-limiting block, 18-third O-ring, 19-fourth O-ring, 20-wear-resistant bearing. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0019] A bidirectional all-metal sealed high-frequency control butterfly valve includes a valve body 1, a valve stem 2 inside the valve body 1, and a butterfly plate 3 connected to the valve stem 2. The valve body 1 has an annular groove 11, within which a piston ring 4 and a valve seat ring 5 are located. A movable valve seat 6 is located at the front end of the valve seat ring 5. The movable valve seat 6 can move horizontally along the flow channel. The sealing principle is self-sealing based on medium pressure; that is, the higher the medium pressure, the greater the medium force acting on the valve seat, resulting in a higher sealing specific pressure and thus better sealing. The movable valve seat can compensate for wear and erosion of the sealing pair under medium thrust, ensuring a good sealing effect after high-frequency switching. The movable valve seat 6 and the butterfly plate 3 are fitted with a conical hard seal, employing a hard-on-hard sealing surface that is resistant to erosion, wear, and high temperatures. The bottom of the annular groove 11 is also provided with a drainage hole 12. Reverse medium enters the bottom of the annular groove 11 through the drainage hole 12, pushing the piston ring. The piston ring pushes the valve seat ring 5, which in turn pushes the movable valve seat 6, causing the movable valve seat 6 to wedge tightly against the sealing surface of the butterfly plate 3. When the medium flows in the forward direction, the medium pressure acts on the valve seat ring and the valve seat. The valve seat sealing surface and the butterfly plate metal sealing surface form an initial seal, similar to the ring formed by C and A in the diagram. Pushing the valve seat ring transmits force to the valve seat, making the valve seat tightly adhere to the butterfly plate sealing surface. The higher the medium pressure, the greater the force, and the better the seal. The tendency of the valve seat to move towards the butterfly plate sealing surface facilitates compensation for wear or insufficient machining accuracy, ensuring the reliability of the seal. When the medium flows in reverse, it enters the bottom of the concave annular groove through a small hole on the valve body, pushing the piston ring. The piston ring pushes the valve seat ring, which in turn pushes the valve seat, causing it to press against the butterfly plate sealing surface. The higher the pressure, the greater the pressing force, which is more conducive to sealing. It also helps compensate for wear or erosion. The force is similar to the ring formed between A and D in the diagram. Regardless of whether the medium flows in the forward or reverse direction, the valve seat will be pushed by the medium to press against the butterfly plate sealing surface. The greater the medium pressure, the greater the sealing force, creating a self-sealing effect due to medium pressure. Both the valve seat and the butterfly plate sealing surfaces are hard metal sealing surfaces. Through hardening treatment, the valve seat sealing surface has a higher hardness, while the butterfly plate sealing surface has a slightly lower hardness, creating a hardness difference. This prevents damage to the valve seat sealing surface during switching, ensuring that wear on the sealing surface occurs on the butterfly plate sealing surface after long-term use. However, the valve seat is movable, and it is pushed against the butterfly plate sealing surface by the medium to compensate for wear. Therefore, the entire sealing pair can maintain the sealing performance of a new valve even after high-frequency switching. There is a certain gap E between the movable valve seat and the limit block set on the valve body. This gap E is set by comprehensively considering factors such as the valve's service life, the wear resistance of the materials between the sealing surfaces, the differential pressure of the valve's operating conditions, the required switching frequency of the process pipeline, and the system maintenance cycle.

[0020] The first O-ring 7 is arranged between the valve seat ring 5 and the movable valve seat 6, and the second O-ring 8 is arranged between the valve seat ring 5 and the inner wall of the annular groove 11. The positive medium passes through the gap between the movable valve seat, the valve seat ring 6 and the valve body to reach the circular annular space between the valve seat ring 5 and the piston ring 4. The medium pressure pushes the valve seat ring 5 and the movable valve seat 6 to wedge the sealing surface of the butterfly plate 3.

[0021] The step structure is arranged on the valve seat ring 5 and the movable valve seat 6, and the buffer washer 9 is further arranged between the step structures. In the fast closing moment of the metal-to-metal sealing pair, the buffer washer can absorb part of the kinetic energy, so as to avoid the damage caused by the hard-to-hard sealing collision.

[0022] The first anti-rotation limiting pin 13 is further arranged between the valve seat ring 5 and the movable valve seat 6. The second anti-rotation limiting pin 14 is arranged between the piston ring 4 and the valve seat ring 5. The third anti-rotation limiting step pin 16 is arranged between the piston ring 4 and the bottom of the valve body annular groove. Through the combined action of the three anti-rotation pins, the anti-rotation limiting pin transmits the anti-rotation force of the movable valve seat 6 to the valve body, so as to ensure the reliability of the anti-rotation. The purpose of arranging the anti-rotation pins is to prevent the rotation of the valve seat in the high-frequency switching process and the washing process of the medium, so as to affect the sealing fit and the sealing effect after the rotation of the sealing surface.

[0023] The adjusting screw 15 is further arranged at the bottom of the annular groove 11. The adjusting screw pushes the piston ring 4, the valve seat ring 5 and the movable valve seat 6 to form an initial pre-tightness specific pressure. The adjusting screw can also adjust the situation that the sealing fit is not in place due to the machining error, reduce the machining precision requirement of the metal-to-metal sealing pair and compensate on the structure. The key setting to realize that the hard-to-hard sealing surface is not damaged by collision in the high-frequency closing is that the metal-to-metal sealing pair is not completely contacted in the no-load closing or pressure closing moment, so as to avoid the impact in the closing to damage the sealing surface. However, at this time, a very large pressure difference is formed between the upstream and the downstream, the pressure difference pushes the movable valve seat 6 metal sealing ring and the butterfly plate metal sealing ring to completely fit, so as to realize the complete sealing. The automatic sealing effect of the metal sealing valve seat pushed by the pressure medium after the hard sealing is closed to the position is realized. The no-friction, no-scratching and no-impact in the closing process are realized. The effect setting of the small gap of the metal sealing pair in the just-closed moment is realized by adjusting the position of the valve seat, the valve seat ring and the piston ring through the adjusting screw. The wear-resistant pad 10 is further arranged at the bottom of the valve stem 2. The valve stem and the wear-resistant bushing are subjected to hardening treatment, so as to ensure that the wear is controlled within the expected range in the high-frequency operation process.

[0024] Skilled persons should know that although the present application has been described according to the above specific embodiments, the inventive idea of the present application is not limited to this application. Any modification using the inventive idea will be included in the patent protection scope of the present patent.

[0025] The above merely describes the preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-described embodiments. Any technical solution falling within the concept of the present application shall fall within the protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, some improvements and refinements without departing from the principles of the present application shall also be considered as falling within the protection scope of the present application.

Claims

1. A bidirectional all-metal sealed high-frequency control butterfly valve, comprising a valve body (1), wherein a valve stem (2) is provided inside the valve body (1), and a butterfly plate (3) is connected to the valve stem (2), characterized in that, The valve body (1) is provided with an annular groove (11), and a piston ring (4) and a valve seat ring (5) are provided in the annular groove (11). The valve seat ring (5) is also provided with a movable valve seat (6) at the front end. The movable valve seat (6) can move horizontally along the flow channel. The movable valve seat (6) and the butterfly plate (3) are in a cone-surface hard seal fit. The bottom of the annular groove (11) is also provided with a drainage hole (12). The medium enters the annular groove (11) through the drainage hole (12) and pushes the piston ring. The piston ring pushes the valve seat ring (5), and the valve seat ring (5) pushes the movable valve seat (6), so that the movable valve seat (6) wedges tightly against the sealing surface of the butterfly plate (3).

2. The bidirectional all-metal sealed high-frequency control butterfly valve according to claim 1, characterized in that, A first O-ring (7) is provided between the valve seat ring (5) and the movable valve seat (6). The positive medium pushes the movable valve seat (6) to wed the sealing surface of the butterfly plate (3) through the gap between the movable valve seat (6) and the valve body (1).

3. The bidirectional all-metal sealed high-frequency control butterfly valve according to claim 2, characterized in that, A second O-ring (8) is provided between the piston ring (4) and the valve seat ring (5) and the inner wall of the annular groove (11). The positive medium passes through the gap between the movable valve seat (6) and the valve seat ring (5) and the valve body (1), and is pushed by the valve seat ring (5) to wed the movable valve seat (6) towards the sealing surface of the butterfly plate (3).

4. The bidirectional all-metal sealed high-frequency control butterfly valve according to claim 2, characterized in that, The valve seat ring (5) and the movable valve seat (6) are provided with stepped structures, and buffer gaskets (9) are provided between the stepped structures.

5. The bidirectional all-metal sealed high-frequency control butterfly valve according to claim 2, characterized in that, A first anti-rotation limit pin (13) is also provided between the valve seat ring (5) and the movable valve seat (6).

6. The bidirectional all-metal sealed high-frequency control butterfly valve according to claim 1, characterized in that, A second anti-rotation limiting pin (14) is provided between the piston ring (4) and the valve seat ring (5).

7. The bidirectional all-metal sealed high-frequency control butterfly valve according to claim 1, characterized in that, The piston ring (4) and the valve body (1) are provided with an annular groove (11), and a third anti-rotation limiting step pin (16) is provided between the bottom of the groove (11). The valve body (1) transmits rigid force to the movable valve seat (6) through the third anti-rotation limiting step pin (16), the second anti-rotation pin (14), and the first anti-rotation pin (13), ensuring that it will not be affected by the medium and rotate due to uneven force, thus affecting the sealing effect.

8. The bidirectional all-metal sealed high-frequency control butterfly valve according to claim 1, characterized in that, The bottom of the annular groove (11) is also provided with an adjusting screw (15), which pushes the piston ring (4), valve seat ring (5), and movable valve seat (6) to form an initial preload pressure.

9. The bidirectional all-metal sealed high-frequency control butterfly valve according to claim 1, characterized in that, The bottom of the valve stem (2) is also provided with a wear-resistant pad (10), and a wear-resistant bearing (20) is provided between the valve stem (2) and the valve body.

10. The bidirectional all-metal sealed high-frequency control butterfly valve according to claim 1, characterized in that, The movable valve seat (6) is provided with a limiting block (17) between itself and the valve body.

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