Bidirectional hard-to-hard metal sealing high-frequency control butterfly valve
By employing a bidirectional hard-on-hard metal sealing structure and an air spring design, the problem of insufficient sealing performance in high-frequency butterfly valves is solved, achieving long-life sealing under high-frequency switching conditions and ensuring the valve's wear resistance, durability, and sealing effect.
Patent Information
- Application Number
- CN202511456867.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2025-09-30
- Filing Date
- 2025-10-13
- Publication Date
- 2025-11-18
AI Technical Summary
Existing high-frequency butterfly valves have insufficient sealing performance, especially under frequent switching and high temperature and high pressure conditions, resulting in a short service life and poor soft sealing performance.
It adopts a bidirectional hard-on-hard metal sealing structure, which utilizes the conical hard seal between the metal sealing ring and the butterfly plate, combined with the air spring structure and anti-rotation pin design, to ensure that the sealing ring is wedge-tight and sealed under the medium pressure. The sealing effect during high-frequency switching is achieved through the combined action of the medium pressure and the air spring.
It achieves long-life sealing under high-frequency switching conditions, with good sealing effect. The sealing performance remains basically unchanged after tens of thousands of switching cycles. It is also wear-resistant, avoiding impact and wear on the sealing surface, and ensuring the reliability and durability of the valve.
Smart Images
Figure CN120969501A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of valves, in particular to a bidirectional hard-to-hard 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 resistance and high erosion resistance, and high opening and closing life. The high-frequency butterfly valve in the current industry is generally a high-performance butterfly valve with soft sealing, but its temperature resistance, wear resistance and erosion resistance are weak, and the service life is not long. SUMMARY In order to solve the technical defects existing in the prior art, the present application provides a bidirectional hard-to-hard metal sealing high-frequency control butterfly valve.
[0003] The technical solution adopted by the present application is as follows: the bidirectional hard-to-hard metal sealing high-frequency control butterfly valve comprises a valve body, a valve rod arranged in the valve body, a butterfly plate connected to the valve rod, a pressing plate ring arranged on the butterfly plate, a recess arranged on the pressing plate ring, a metal sealing ring installed between the recess and the butterfly plate, and a taper surface of the metal sealing ring in cooperation with the valve body, an inlet hole arranged on the pressing plate ring, and the inlet hole being in communication with the metal sealing ring and the butterfly plate. The hydraulic pressure of the medium flowing in the opposite direction is transmitted through the gap between the inlet hole, the metal sealing ring and the butterfly plate to drive the metal sealing ring to move in the direction of wedge tightness which is beneficial to sealing.
[0004] An annular groove is formed on the metal sealing ring, the metal sealing ring is installed in the recess of the pressing plate ring, an enclosed cavity is formed between the annular groove and the recess, a first O-ring is arranged between the metal sealing ring and the inner wall of the recess, a certain volume of gas is enclosed by the O-ring during installation of the cavity, the volume of the gas is compressed during installation, the pressure of the compressed gas is increased, and the cavity and the gas inside form an air spring structure. A step and an annular groove are formed on the butterfly plate, the metal sealing ring is installed between the recess and the step and the annular groove, and the air spring structure pushes the metal sealing ring to tightly adhere to the step of the butterfly plate.
[0005] A rotation prevention pin is further arranged between the metal sealing ring and the butterfly plate to prevent the metal sealing ring from rotating during the erosion of the medium.
[0006] The eccentric amount between the sealing taper surface of the metal sealing ring and the sealing taper surface of the valve body is different, so that a gap is left between the sealing taper surface of the metal sealing ring and the sealing taper surface of the valve body, the metal-to-metal sealing pair is not completely contacted at the moment of closing under no load or closing under pressure, and the impact during closing is avoided to prevent damage to the sealing surface.
[0007] A first gap is further present between the end faces of the metal sealing ring and the pressing plate ring.
[0008] The metal sealing ring and the annular groove and inner side of the butterfly plate also have a second gap.
[0009] The pressing plate ring is fixedly installed on the butterfly plate by screws.
[0010] The bottom of the valve rod is also provided with a wear-resistant pad.
[0011] The beneficial effects of the present application are: the present application provides a bidirectional hard collision metal sealing 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, a pressing plate ring arranged on the butterfly plate, a recess arranged on the pressing plate ring, a metal sealing ring installed between the recess and the butterfly plate, a conical surface hard sealing cooperation between the metal sealing ring and the valve body, an inlet hole arranged on the pressing plate ring, and the inlet hole being in communication with the metal sealing ring and the butterfly plate. The medium flowing in the opposite direction pushes the metal sealing ring to move in the wedging direction conducive to sealing through the inlet hole and the second gap. By installing the metal sealing ring on the butterfly plate, the valve is designed to be pushed by the medium to move in the wedging direction conducive to sealing when bearing the pressure from the upstream and downstream, and the higher the pressure, the better the sealing effect. BRIEF DESCRIPTION OF DRAWINGS Figure 1 It is a structural schematic diagram of the present application.
[0012] Figure 2 It is a structural schematic diagram of the butterfly plate and the pressing plate ring of the present application.
[0013] Figure 3 It is a partial structural schematic diagram of the sealing structure of the present application Figure 4 It is a structural schematic diagram of the metal sealing ring of the present application Wherein 1 is a valve body, 2 is a valve rod, 3 is a butterfly plate, 4 is a pressing plate ring, 5 is a metal sealing ring, 6 is a cavity, 7 is an anti-rotation pin, 8 is a first gap, 9 is a wear-resistant pad, 10 is a wear-resistant bushing, 11 is a second O-ring, 31 is an annular groove of the butterfly plate, 32 is a second gap, 33 is a step of the butterfly plate, 41 is a recess, 42 is an inlet hole, 51 is a ring groove, 52 is an annular boss, and 61 is a first O-ring. DETAILED DESCRIPTION
[0014] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0015] The utility model provides a bidirectional hard metal seal high frequency control butterfly valve, including the valve body 1, be equipped with the valve stem 2 in the valve body 1, the valve stem 2 is connected with the butterfly plate 3, the butterfly plate 3 is equipped with the pressing plate ring 4, the pressing plate ring 4 is equipped with recess 41, metal seal ring 5 is installed between recess 41 and butterfly plate 3, the metal seal ring 5 is cooperated with the conical surface hard sealing of valve body 1, adopts the hard sealing surface of hard, and the sealing surface is resistant to scouring, wear -resisting, high temperature resistance. The pressing plate ring 4 is equipped with the pressure inlet hole 42, the pressure inlet hole 42 is communicated with metal seal ring 5 and butterfly plate 3 through the second gap 32, and the medium of reverse flow is communicated with the second gap 32 through the pressure inlet hole 42 and pushes metal seal ring 5 to the direction of movement that is beneficial to sealing in wedge. The metal seal ring 5 is formed with ring groove 51, the metal seal ring 5 is installed in the recess 41 of pressing plate ring 4, the ring groove 51 and recess 41 form a closed cavity 6 between, the metal seal ring 5 and the inner wall of recess 41 are equipped with O type ring 61, the cavity 6 is sealed with a certain volume of gas, the gas in the cavity 6 is the gas compressed during installation, and the internal pressure is greater than atmospheric pressure, and the internal gas forms air spring structure. The metal seal ring 5 and butterfly plate 3 are further equipped with the anti-rotation pin 7 of avoiding the rotation of metal seal ring 5 in the scouring process of medium. Recess and metal seal ring are sealed through O type ring, seal a certain volume of gas in the inside, compress the gas during installation, and the gas generates a force to push the metal seal ring to adhere to the step of butterfly plate, to ensure that the metal seal ring adheres to the butterfly plate and does not shake when the valve is in the open state. In addition, the anti-rotation pin avoids the rotation of metal seal ring in the scouring process of medium.
[0016] The ring groove on the metal sealing ring, together with the installation groove on the pressing plate ring, forms a closed volume, and the pressure applied to the metal sealing ring after installation is designed according to the principle of the gaseous equation (P1V1=P2V2 at constant temperature), which is equivalent to the principle of the air spring. This elastic force acts on the metal sealing ring. The clever design combination of the butterfly plate, the metal sealing ring, the pressing plate ring, and the valve body makes the metal sealing ring tightly pressed on the step of the butterfly plate by the air spring after the valve is opened, preventing shaking and rotating. When the valve is closed and the medium is pressurized along the main flow direction, the metal sealing ring is subjected to the pressure on the torus formed by the sealing surfaces C and D of the valve body, which is much greater than the pressure of the enclosed air in the metal valve seat and the pressing plate ring. At this time, the air in the closed cavity is compressed, and the metal valve seat is pushed to the outlet direction by the high-pressure medium, and the pressure is tighter, the sealing effect is good, and after long-term use, if there is wear between the sealing pairs, it can be compensated to ensure that the metal-to-metal surface is completely attached. It also ensures that the wear compensation after high-frequency switching ensures that the sealing effect after tens of thousands of switches is basically the same as that of a new valve. That is, when the medium pressure acts in the forward direction, the metal sealing ring can be compensated for the expected wear under the action of the medium force to ensure long-term and reliable forward sealing. When the medium pressure acts in the reverse direction, the forward pressure is low or basically non-existent. At this time, an initial seal is formed between the metal sealing pairs, and the medium pushes the metal valve seat to compress the air spring between A and B, making the valve seat move in the direction of the wedge direction that is conducive to sealing, so that the sealing pairs can better compensate for wear under the action of the medium pressure after high-frequency switching, scouring, and wear. By reasonably designing the sizes of A, B, C, and D and reasonably arranging the positions of the first O-ring and the second O-ring, the metal sealing ring can float in the direction conducive to sealing under the action of the forward or reverse medium pressure when the valve is closed, so that the sealing effect is better, and the wear can be compensated in time after scouring or wear, ensuring that the valve sealing pairs after tens of thousands of high-frequency switches are basically the same as those of a new valve.
[0017] The step 33 and the annular groove 31 are formed on the butterfly plate 3, the metal sealing ring 5 is installed between the groove 41 and the step 33 and the annular groove 31, and the air spring structure pushes the metal sealing ring 5 to tightly adhere to the step 33 of the butterfly plate 3.
[0018] The eccentricity between the sealing cone surface of the metal sealing ring 5 and the sealing cone surface of the valve body 1 is different, so that a gap is left between the sealing cone surface of the metal sealing ring 5 and the sealing cone surface of the valve body 1, and the metal-to-metal sealing pair is not completely contacted at the instant of empty load closing or pressure closing, so as to avoid the impact of the sealing surface at the closing time. The key setting to realize the hard-to-hard sealing surface that is not damaged by impact at high frequency closing is that the metal-to-metal sealing pair is not completely contacted at the instant of empty load closing or pressure closing, and a small gap is left to avoid the impact of the sealing surface at the closing time, but at this time, a very large pressure difference is formed between the upstream and the downstream, and the pressure difference pushes the metal sealing ring to completely adhere, so as to realize complete sealing. The automatic sealing effect of the metal sealing ring pushed by the pressure medium after the hard sealing is closed to the position is realized. The frictionless, scratch-free and impact-free during the closing process are realized. The effect setting of the small gap of the metal sealing pair at the instant of closing is realized by controlling the inconsistent amount of the valve body seat sealing surface eccentricity and the butterfly plate assembly metal sealing eccentricity.
[0019] The first gap 8 is further left between the end surface of the metal sealing ring 5 and the pressing plate ring 4.
[0020] The second gap 32 is further left between the metal sealing ring 5 and the groove and inner surface of the butterfly plate 3.
[0021] The pressing plate ring 4 is fixedly installed on the butterfly plate 3 through a screw.
[0022] The bottom of the valve stem 2 is further provided with a wear-resistant pad 9, and the valve stem and the wear-resistant bushing are hardened to ensure that the wear is controlled within the expected range during high-frequency operation.
[0023] It should be noted that although the present application has been described in the above specific embodiments, the inventive idea of the present application is not limited to this application, and any modification using the inventive idea will be included in the patent protection scope of the present patent.
[0024] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above embodiments. Any technical solution belonging to the idea of the present application is included in the protection scope of the present application. It should be noted that for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principle of the present application are also considered as the protection scope of the present application.
Claims
1. A bidirectional hard-on-hard 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 butterfly plate (3) is provided with a pressure ring (4), the pressure ring (4) is provided with a groove (41), a metal sealing ring (5) is installed between the groove (41) and the butterfly plate (3), the metal sealing ring (5) and the valve body (1) are in a conical hard seal fit, the pressure ring (4) is provided with a pressure inlet hole (42), the pressure inlet hole (42) is connected to the metal sealing ring (5) and the butterfly plate (3), the reverse flow medium pushes the metal sealing ring (5) to move in a wedge-tight direction that is conducive to sealing through the pressure inlet hole (42).
2. The bidirectional hard-on-hard metal seal high-frequency control butterfly valve according to claim 1, characterized in that, The metal sealing ring (5) has an annular groove (51) and an annular boss (52). The metal sealing ring (5) is installed in the groove (41) of the pressure plate ring (4). A closed cavity (6) is formed between the annular groove (51) and the groove (41). A first O-ring (61) is provided between the metal sealing ring (5) and the inner wall of the groove (41). A certain volume of gas is sealed in the cavity (6). The cavity (6) and the gas inside form an air spring structure.
3. The bidirectional hard-on-hard metal seal high-frequency control butterfly valve according to claim 2, characterized in that, The butterfly plate (3) has a step (33) formed on it, and an annular groove (31) and a second O-ring (11) mounting groove are provided on the outside of the annular groove (31). The metal sealing ring (5) is installed between the groove (41) and the annular groove (31) and the butterfly plate step (33). The air spring structure pushes the metal sealing ring (5) to stick tightly to the butterfly plate step (33).
4. The bidirectional hard-on-hard metal seal high-frequency control butterfly valve according to claim 3, characterized in that, An anti-rotation pin (7) is also provided between the metal sealing ring (5) and the butterfly plate (3) to prevent the metal sealing ring (5) from rotating during the scouring process of the medium.
5. The bidirectional hard-on-hard metal seal high-frequency control butterfly valve according to claim 1, characterized in that, The eccentricity between the sealing cone surface of the metal sealing ring (5) and the sealing cone surface of the valve body (1) is different, so that there is a gap between the sealing cone surface of the metal sealing ring (5) and the sealing cone surface of the valve body (1). When the metal is closed under no-load or under pressure, the metal-to-metal sealing pair does not come into complete contact, thus avoiding the impact that damages the sealing surface when closing.
6. The bidirectional hard-on-hard metal seal high-frequency control butterfly valve according to claim 1, characterized in that, There is also a first gap (8) between the end faces of the metal sealing ring (5) and the pressure plate ring (4).
7. The bidirectional hard-on-hard metal seal high-frequency control butterfly valve according to claim 1, characterized in that, There is also a second gap (32) between the metal sealing ring (5) and the butterfly plate (3).
8. The bidirectional hard-on-hard metal seal high-frequency control butterfly valve according to claim 1, characterized in that, The pressure plate ring (4) is fixedly installed on the butterfly plate (3) by screws.
9. The bidirectional hard-on-hard metal seal 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 (9), and a wear-resistant bushing (10) is provided in the valve stem (2) and the valve body shaft hole.