Chemical kettle top valve

Abstract

The present invention relates to the technical field of chemical valves, and discloses a chemical kettle top valve, including a valve body and a valve cover, a ball, two valve seats and two biasing components, wherein the valve body is connected to the valve cover; the ball is arranged in the valve flow channel, and the two valve seats include a reactor end valve seat arranged between the valve body and the ball and connected to the valve body, and a feed end valve seat arranged between the valve cover and the ball and connected to the valve cover; the biasing component includes a biasing member for forcing the valve seat to abut against the ball, and a sealing member filled between the reactor end valve seat and the valve body or between the feed end valve seat and the valve cover; the medium pressure of the reactor end valve seat close to one end of the valve body is greater than the medium pressure of the reactor end valve seat close to one end of the ball; and the medium pressure of the feed end valve seat close to one end of the valve cover is greater than the medium pressure of the feed end valve seat close to one end of the ball. This kettle top valve is a one-way double valve seat seal, that is, under the same pressure source direction, the two valve seats can realize the function of blocking the medium, thereby improving the pressure-maintaining safety performance of the reactor.

Description

Technical Field

[0001] The invention relates to the technical field of chemical valves, in particular to a kettle top valve for chemical industry. Background Art

[0002] In the field of chemical production, the reactor is a core equipment, and the precise control of its feeding and discharging links plays a decisive role in the stability, safety and product quality of the entire production process. The top valve of the chemical plant is generally installed vertically on the top of the reactor, and is a key component for controlling the feeding and discharging of the reactor. During the feeding stage, the valve is opened, and the medium flows smoothly into the reactor from top to bottom under the action of pressure difference, etc., to provide raw materials for the reaction; when the reactor enters the pressurized reaction stage, the valve is closed. At this time, the end of the valve connected to the reactor needs to withstand the pressure in the reactor, and its sealing direction is from bottom to top, which makes the flow direction of the medium during feeding completely opposite to the direction when the valve is closed and under pressure. This special working condition and flow direction requirement poses a very high challenge to the performance and reliability of the valve.

[0003] At present, most ball valves used in reactors adopt a design structure with two symmetrical valve seats, which gives the valve the ability to seal in both directions, that is, the valve can achieve effective sealing regardless of the direction of the pressure source. However, this conventional ball valve can only achieve single-way blocking when facing the same pressure source direction. Summary of the invention

[0004] In view of this, the present invention provides a chemical reactor top valve to solve the problem that a conventional reactor can only achieve single-channel blocking when facing the same pressure source direction.

[0005] In a first aspect, the present invention provides a chemical reactor top valve, comprising a valve body and a valve cover, a ball, two valve seats and two biasing components, wherein the valve body is connected to the valve cover and the through holes inside the two are connected to form a valve flow channel; the ball is arranged in the valve flow channel and is movably connected to the valve body; the ball is configured to block or open the valve flow channel; the two valve seats include a reactor end valve seat arranged between the valve body and the ball and connected to the valve body, and a feed end valve seat arranged between the valve cover and the ball and connected to the valve cover; the two biasing components include a valve seat arranged at the reactor end and a valve cover; the valve seat is arranged at the reactor end and a valve cover; the two biasing components include a valve seat ... A reactor end biasing assembly is provided between the valve body and the reactor end valve seat, and a feed end biasing assembly is provided between the valve cover and the feed end valve seat; the biasing assembly comprises a biasing member for forcing the valve seat to abut against the ball, and a sealing member filled between the reactor end valve seat and the valve body or between the feed end valve seat and the valve cover; wherein the medium pressure of the reactor end valve seat close to the valve body end is greater than the medium pressure of the feed end valve seat close to the ball end; and the medium pressure of the feed end valve seat close to the valve cover end is greater than the medium pressure of the feed end valve seat close to the ball end.

[0006] Beneficial effect: In the present invention, a special pressure design is adopted, that is, the medium pressure of the reactor end valve seat near the valve body is greater than the medium pressure of the reactor end valve seat near the sphere, so that the reactor end valve seat can better fit closely with the sphere under the action of the medium pressure, thereby enhancing the sealing effect. This design can effectively prevent the leakage of the medium in the reactor and ensure production safety. Even when the pressure in the reactor fluctuates greatly, the valve seat can maintain good sealing performance. When the valve is in the closed state, under normal circumstances, the reactor end valve seat and the feed end valve seat work together to block the valve flow channel and prevent the medium from flowing. However, during long-term use, the reactor end valve seat may fail to seal due to wear, corrosion and other reasons. Once the reactor end valve seat seal fails, the medium pressure P in the reactor will enter the valve cavity. At this time, the medium pressure of the feed end valve seat near the valve cover is greater than the medium pressure near the sphere, and the feed end valve seat will be subjected to a force toward the sphere under the action of this pressure difference. This force enables the valve seat at the feed end to abut the ball more closely, just like applying an extra "pressure lock" to the valve seat, which enhances the fit between the two. The tight fit greatly improves the sealing performance between the valve seat at the feed end and the ball, and can effectively prevent the medium from continuing to leak from the middle cavity. In chemical production, many materials are dangerous, such as toxic, flammable, and explosive. Material leakage will not only cause environmental pollution, but may also cause safety accidents. The secondary sealing effect of the valve seat at the feed end avoids these potential dangers and ensures the safety of personnel and equipment at the production site.

[0007] In an optional embodiment, the medium contact area of ​​the valve seat at the reactor end close to the valve body is larger than the medium contact area at the spherical end, and the medium contact area of ​​the valve seat at the feed end close to the valve cover is larger than the medium contact area of ​​the valve seat at the feed end close to the spherical end.

[0008] Beneficial effects: By designing that the media contact area of ​​the reactor end valve seat near the valve body is larger than the media contact area of ​​the ball end, and the media contact area of ​​the feed end valve seat near the valve cover is larger than the media contact area of ​​the ball end, the medium pressure can be cleverly used to enhance the sealing effect between the valve seat and the ball. Due to the difference in media contact area at both ends of the valve seat, the pressures at both ends of the valve seat are different under the same medium pressure. Taking the reactor end valve seat as an example, the pressure at the end near the valve body is greater, and the pressure at the end near the ball is smaller, which will form a combined force on the valve seat toward the ball. This combined force enables the valve seat to abut the ball more tightly, thereby improving the sealing performance. Similarly, the feed end valve seat can achieve the purpose of strengthening the seal by using the medium's own pressure through this area difference design.

[0009] In an optional embodiment, the sealing diameter between the valve seat at the reactor end and the valve body is larger than the sealing diameter between the valve seat at the reactor end and the sphere; and the sealing diameter between the valve seat at the feed end and the valve cover is smaller than the sealing diameter between the valve seat at the feed end and the sphere.

[0010] Beneficial effects: In fluid mechanics, for a component such as a valve seat that works under pressure, the difference in sealing diameter will significantly affect the pressure distribution and sealing effect. According to the pressure calculation formula, under the same medium pressure, different sealing diameters mean different force areas, which in turn leads to different pressures on different parts of the valve seat. That is, the sealing diameter between the reactor end valve seat and the valve body is set to be larger than the sealing diameter between the sphere, and the sealing diameter between the feed end valve seat and the valve cover is set to be smaller than the sealing diameter between the sphere, so that the medium contact area of ​​the reactor end valve seat near the valve body is larger than the medium contact area near the sphere, and the medium contact area of ​​the feed end valve seat near the valve cover is larger than the medium contact area of ​​the feed end valve seat near the sphere. As a result, the valve seat generates a combined force toward the sphere under the action of the medium pressure. This combined force allows the valve seat to fit the sphere more closely, thereby achieving a better sealing effect.

[0011] In an optional embodiment, a notch is provided at the inner edge of the end of the reactor end valve seat close to the sphere, and the notch is suitable for medium filling; the sealing diameter between the reactor end valve seat and the valve body is limited by the notch.

[0012] Beneficial effect: Since it is necessary to ensure that the sealing diameter between the valve seat at the reactor end and the valve body is larger than the sealing diameter between the valve seat at the reactor end and the sphere, a notch is provided at the inner edge of the end of the valve seat at the reactor end close to the sphere, and the medium is filled inside the notch to determine the sealing diameter between the valve seat at the reactor end and the sphere, so as to realize the difference in sealing diameter between the valve seat at the reactor end and the valve body and the sphere, thereby achieving the purpose of strengthening the seal by using the medium's own pressure.

[0013] In an optional embodiment, the reactor end valve seat is stepped near one end of the valve body, and the reactor end biasing assembly includes a reactor end pressure ring, a reactor end biasing member and a reactor end sealing member. A notch is provided on one side of the reactor end pressure ring, and the reactor end pressure ring abuts against the end step surface of the reactor end valve seat through the notch; the reactor end biasing member is arranged between the valve body and the reactor end pressure ring.

[0014] Beneficial effect: The reactor end valve seat is stepped near one end of the valve body. After the reactor end valve seat is installed, there is a gap between the reactor end valve seat and the valve body due to the stepped design. A notch is provided on one side of the reactor end pressure ring, and the reactor end pressure ring abuts against the end step surface of the reactor end valve seat through the notch, so the end of the reactor end pressure ring can be inserted into the gap between the reactor end valve seat and the valve body. At the same time, the reactor end biasing member is arranged between the valve body and the reactor end pressure ring. The reactor end biasing member usually adopts an elastic element, such as a spring. Its main function is to provide a continuous biasing force to force the reactor end valve seat to abut the ball. During the working process of the valve, whether the valve is open or closed, the reactor end biasing member always maintains a certain amount of compression, thereby ensuring close contact between the reactor end valve seat and the ball.

[0015] In an optional embodiment, the reactor end seal is filled in the gap between the reactor end pressure ring, the end step surface of the reactor end valve seat and the valve body.

[0016] Beneficial effect: The seal between the reactor end valve seat and the ball is one of the key links of valve sealing, and the role of the reactor end seal is to further strengthen the seal between the reactor end valve seat and the valve body. When the reactor end valve seat abuts against the ball under the action of the reactor end biasing member, the reactor end seal simultaneously forms a seal between the reactor end valve seat and the valve body. The double sealing guarantee greatly improves the overall sealing reliability of the valve.

[0017] In an optional embodiment, the chemical reactor top valve further includes a sealing ring, which is sleeved on the valve seat at the end of the reactor, and is suitable for abutting against the valve body.

[0018] Beneficial effects: When the valve is closed, the reactor end seal fills the gap between the reactor end pressure ring, the end stepped surface of the reactor end valve seat and the valve body, forming the first sealing defense line to prevent most of the medium from leaking. The sealing ring set on the reactor end valve seat is in close contact with the valve body, forming the second sealing defense line. Under the action of the medium pressure, the reactor end seal is filled in the gap and is squeezed by pressure to further fit the surface of each component, reducing the possibility of the medium passing through the gap; the sealing ring undergoes elastic deformation under the dual action of its own elasticity and medium pressure, tightly attached to the contact surface between the valve body and the reactor end valve seat, blocking the trace leakage of the medium that may pass through the first sealing defense line.

[0019] In an optional embodiment, a notch is provided at the end of the feed end valve seat, and the sealing diameter between the feed end valve seat and the valve cover is limited by the depth of the notch; the feed end biasing assembly is provided between the notch and the valve cover.

[0020] Beneficial effect: In the present invention, the valve seat at the feed end and the valve cover are clearance-matched, and no seal is used between the two, so the medium pressure P can enter the slot behind the valve seat at the feed end; it can be seen from the above that the sealing diameter between the valve seat at the feed end and the valve cover is smaller than the sealing diameter between the valve seat at the feed end and the sphere, and the valve seat at the feed end is sealed with the valve cover through the slot provided at its end, so the sealing diameter between the valve seat at the feed end and the valve cover is limited by the depth of the slot.

[0021] In an optional embodiment, the feed end biasing assembly also includes a feed end pressure ring, which abuts against the valve cover; the feed end biasing member is arranged between the feed end valve seat and the feed end pressure ring, and the feed end sealing member is filled in the gap between the feed end pressure ring, the feed end valve seat and the valve cover.

[0022] Beneficial effect: The feed end valve seat and the valve cover adopt a clearance fit, and no seal is used between the two, but the seal is achieved by the notch. When the medium pressure P enters the notch behind the feed end valve seat, since the sealing diameter between the feed end valve seat and the valve cover is smaller than the sealing diameter between the feed end valve seat and the ball, the medium pressure will form a pressure difference toward the ball at the notch. This pressure difference makes the feed end valve seat tightly abut the ball under the dual action of the medium pressure and the biasing component, thereby achieving sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic structural diagram of a chemical kettle top valve according to an embodiment of the present invention; Figure 2 for Figure 1 A is a partial enlarged schematic diagram; Figure 3 for Figure 1 A partial enlarged schematic diagram of B in the figure.

[0025] Description of reference numerals: 1. Valve body; 2. Valve cover; 3. Ball; 4. Reactor end valve seat; 5. Feed end valve seat; 601. Reactor end pressure ring; 602. Reactor end biasing piece; 603. Reactor end sealing piece; 701. Feed end pressure ring; 702. Feed end biasing piece; 703. Feed end sealing piece; 8. Sealing ring; 9. Valve stem; 10. Pivot. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0027] In the field of chemical production, the reactor is a core equipment, and the precise control of its feeding and discharging links plays a decisive role in the stability, safety and product quality of the entire production process. The top valve of the chemical plant is generally installed vertically on the top of the reactor, and is a key component for controlling the feeding and discharging of the reactor. During the feeding stage, the valve is opened, and the medium flows smoothly into the reactor from top to bottom under the action of pressure difference, etc., to provide raw materials for the reaction; when the reactor enters the pressurized reaction stage, the valve is closed. At this time, the end of the valve connected to the reactor needs to withstand the pressure in the reactor, and its sealing direction is from bottom to top, which makes the flow direction of the medium during feeding completely opposite to the direction when the valve is closed and under pressure. This special working condition and flow direction requirement poses a very high challenge to the performance and reliability of the valve.

[0028] At present, most ball valves used in reactors adopt a design structure with two symmetrical valve seats, which gives the valve the ability to seal in both directions, that is, the valve can achieve effective sealing regardless of the direction of the pressure source. However, this conventional ball valve can only achieve single-way blocking when facing the same pressure source direction. To this end, this embodiment provides a chemical reactor top valve to solve the problem that conventional reactors can only achieve single-way blocking when facing the same pressure source direction.

[0029] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0030] According to an embodiment of the present invention, a chemical reactor top valve is provided, comprising a valve body 1, a valve cover 2, a ball 3, two valve seats and two biasing components. The valve body 1 is connected to the valve cover 2 and the through holes inside the two are connected to form a valve flow channel; the ball 3 is arranged in the valve flow channel and is movably connected to the valve body 1; the ball 3 is configured to block or open the valve flow channel; the two valve seats include a reactor end valve seat 4 arranged between the valve body 1 and the ball 3 and connected to the valve body 1, and a feed end valve seat 5 arranged between the valve cover 2 and the ball 3 and connected to the valve cover 2; the two biasing components include a reactor end biasing component arranged between the valve body 1 and the reactor end valve seat 4 The biasing assembly comprises a biasing member forcing the valve seat to abut against the ball 3, and a sealing member filled between the reactor end valve seat 4 and the valve body 1 or between the feed end valve seat 5 and the valve cover 2; wherein the medium pressure at the reactor end valve seat 4 close to the valve body 1 is greater than the medium pressure at the end close to the ball 3; and the medium pressure at the feed end valve seat 5 close to the valve cover 2 is greater than the medium pressure at the feed end valve seat 5 close to the ball 3.

[0031] In this embodiment, the valve body 1 and the valve cover 2 are interconnected, and the through holes inside the two are connected to form a valve flow channel. The valve body 1 and the valve cover 2 are usually made of high-strength, corrosion-resistant metal materials, such as stainless steel, to adapt to the harsh environment in chemical production. Its shape and size are designed according to specific usage requirements and pipeline connection requirements to ensure compatibility with the entire chemical system. The main function of the ball 3 is to block or open the valve flow channel. By rotating the ball 3, the opening and closing operations of the valve can be achieved. When the ball 3 rotates to a position aligned with the valve flow channel, the fluid can pass through the valve smoothly; when the ball 3 rotates to a position perpendicular to the valve flow channel, the ball 3 blocks the valve flow channel and prevents the fluid from flowing. The precise control of the ball 3 can achieve accurate on-off of the fluid and meet the control requirements of the fluid flow and flow direction in different process stages of chemical production. Good sealing performance can effectively prevent the medium from leaking when the valve is closed, thereby improving the safety and stability of production. In addition, the wear resistance of the ball 3 can ensure that it is not easily damaged during frequent operation, thereby extending the service life of the valve.

[0032] In this embodiment, in order to achieve sealing of the ball 3, two valve seats are provided, namely, a reactor end valve seat 4 provided between the valve body 1 and the ball 3 and connected to the valve body 1, and a feed end valve seat 5 provided between the valve cover 2 and the ball 3 and connected to the valve cover 2.

[0033] like Figure 1 and Figure 2As shown, the reactor end valve seat 4 is arranged between the valve body 1 and the ball 3, and is connected to the valve body 1. The shape and size of the reactor end valve seat 4 match the valve body 1 and the ball 3, and the end close to the ball 3 has a sealing surface to ensure a close fit with the ball 3. The reactor end valve seat 4 plays a role of sealing and supporting. When the ball 3 closes the valve, it can form a tight seal with the ball 3 to prevent the medium from leaking from the reactor end. Specifically, when the valve is closed, the reactor end biasing assembly arranged between the valve body 1 and the reactor end valve seat 4 provides sealing between the reactor valve seat and the valve body 1, and the reactor end biasing assembly pushes the reactor end valve seat 4 toward the ball 3.

[0034] In this embodiment, a special pressure design is adopted, that is, the medium pressure at the end of the reactor valve seat 4 close to the valve body 1 is greater than the medium pressure at the end of the reactor valve seat 4 close to the ball 3, so that the reactor valve seat 4 can better fit closely with the ball 3 under the action of the medium pressure, thereby enhancing the sealing effect. This design can effectively prevent the leakage of the medium in the reactor and ensure production safety. Even when the pressure in the reactor fluctuates greatly, the valve seat can maintain good sealing performance.

[0035] In this embodiment, if Figure 1 and Figure 3 As shown, the feed end valve seat 5 is arranged between the valve cover 2 and the ball 3, and is connected to the valve cover 2. The structure of the feed end valve seat 5 is similar to that of the reactor end valve seat 4, and also has a special sealing surface design to adapt to the cooperation with the ball 3. One of the functions of the feed end valve seat 5 is to achieve sealing during the feeding process to prevent the medium from leaking from the feed end. It works in conjunction with the reactor end valve seat 4 to jointly ensure the bidirectional sealing performance of the valve. Similarly, the feed end biasing assembly arranged between the valve cover 2 and the feed end valve seat 5 provides sealing between the feed end valve seat 5 and the valve cover 2, and the feed end biasing assembly pushes the feed end valve seat 5 toward the ball 3.

[0036] In this embodiment, when the valve is in the closed state, the reactor end valve seat 4 and the feed end valve seat 5 work together to block the valve flow path and prevent the medium from flowing. However, during long-term use, the reactor end valve seat 4 may fail to seal due to wear, corrosion, etc. Once the reactor end valve seat 4 fails to seal, the medium pressure P in the reactor will enter the valve cavity. At this time, if Figure 3As shown, the medium pressure at the end of the feed end valve seat 5 close to the valve cover 2 is greater than the medium pressure at the end close to the sphere 3. Under the action of this pressure difference, the feed end valve seat 5 will be subjected to a force toward the sphere 3. This force enables the feed end valve seat 5 to abut the sphere 3 more closely, just like applying an additional "pressure lock" to the valve seat, enhancing the fit between the two. The tight fit greatly improves the sealing performance between the feed end valve seat 5 and the sphere 3, and can effectively prevent the medium from continuing to leak from the middle cavity. In chemical production, many materials are dangerous, such as toxic, flammable, explosive, etc. Material leakage will not only cause environmental pollution, but may also cause safety accidents. Through the secondary sealing effect of the feed end valve seat 5, these potential dangers are avoided, and the safety of personnel and equipment at the production site is guaranteed.

[0037] In one embodiment, the medium contact area of ​​the reactor end valve seat 4 near the valve body 1 is greater than the medium contact area of ​​the reactor end valve seat 4 near the spherical body 3, and the medium contact area of ​​the feed end valve seat 5 near the valve cover 2 is greater than the medium contact area of ​​the feed end valve seat 5 near the spherical body 3. In fluid mechanics, Pascal's law states that in a closed container, the pressure applied to a stationary fluid will be transmitted to each point at the same time with equal value. For the reactor end valve seat 4 and the feed end valve seat 5, when the medium applies pressure to the valve seat, the pressure is related to the force area, and the pressure (F) is equal to the pressure (P) multiplied by the force area (A), that is, F = P×A. By designing that the medium contact area of ​​the reactor end valve seat 4 near the valve body 1 is greater than the medium contact area of ​​the feed end valve seat 5 near the valve cover 2 is greater than the medium contact area near the spherical body 3, the medium pressure can be cleverly used to enhance the sealing effect between the valve seat and the spherical body 3. Due to the difference in medium contact area between the two ends of the valve seat, the pressures on the two ends of the valve seat are different under the same medium pressure. Taking the valve seat 4 at the reactor end as an example, the pressure on the end close to the valve body 1 is greater, and the pressure on the end close to the ball 3 is smaller, which will form a combined force on the valve seat toward the ball 3. This combined force enables the valve seat to abut the ball 3 more closely, thereby improving the sealing performance. The same is true for the valve seat 5 at the feed end. Through this area difference design, the purpose of strengthening the seal by using the medium's own pressure is achieved.

[0038] During use, when there is medium pressure in the reactor, the larger medium contact area of ​​the reactor end valve seat 4 near the valve body 1 will bear greater pressure. This greater pressure makes the fit between the valve seat and the ball 3 tighter. In actual chemical production, the medium pressure in the reactor may fluctuate. This area difference design can ensure that the valve seat can maintain a good sealing state with the ball 3 under different pressure conditions. For example, in a high-pressure reactor, even if the medium pressure suddenly increases, the valve seat can be tightly pressed on the ball 3 by the combined force generated by this area difference to prevent medium leakage. This chemical kettle top valve designed based on the valve seat medium contact area difference has a wide range of application prospects. It can be applied to various types of reactors, whether it is a small laboratory reactor or a large industrial production reactor, it can play its advantages. In addition, in different chemical industries, such as petrochemicals, pharmaceuticals, food processing and other fields, as long as it involves the fluid control of the reactor, this valve can be used to provide a strong guarantee for the safe and stable operation of chemical production.

[0039] In one embodiment, the sealing diameter between the reactor end valve seat 4 and the valve body 1 is larger than the sealing diameter between the reactor end valve seat 4 and the sphere 3; and the sealing diameter between the feed end valve seat 5 and the valve cover 2 is smaller than the sealing diameter between the feed end valve seat 5 and the sphere 3. In fluid mechanics, for a component such as a valve seat that works under pressure, the difference in sealing diameter will significantly affect the pressure distribution and sealing effect. According to the pressure calculation formula, under the same medium pressure, different sealing diameters mean different force areas, which in turn leads to different pressures on various parts of the valve seat. That is, the sealing diameter between the reactor end valve seat 4 and the valve body 1 is larger than the sealing diameter between the sphere 3, and the sealing diameter between the feed end valve seat 5 and the valve cover 2 is smaller than the sealing diameter between the sphere 3, so as to achieve that the medium contact area of ​​the reactor end valve seat 4 near the valve body 1 is larger than the medium contact area of ​​the sphere 3, and the medium contact area of ​​the feed end valve seat 5 near the valve cover 2 is larger than the medium contact area of ​​the feed end valve seat 5 near the sphere 3. Then, the valve seat generates a combined force toward the ball 3 under the action of the medium pressure. This combined force enables the valve seat to fit the ball 3 more closely, thereby achieving a better sealing effect.

[0040] In this embodiment, if Figure 2 and Figure 3As shown in the figure, the sealing diameter D2 of the designed reactor end valve seat 4 is smaller than D1, and the medium pressure P provides a force F1=P×S1 on the ball 3 through the pressure bearing area difference S1 of the reactor end valve seat 4, so that the reactor end valve seat 4 is pushed toward the ball 3, so that the ball 3 and the reactor end valve seat 4 are sealed. When the seal of the reactor end valve seat 4 fails, the medium pressure P enters the valve cavity, and the designed diameter D3 of the sealing point between the feed end valve seat 5 and the ball is larger than the sealing diameter D4 between the feed end valve seat 5 and the valve cover, then the medium force P provides a force F2=P×S2 on the feed end valve seat 5 through the pressure bearing area difference S2 of the feed end valve seat 5, so that the feed end valve seat 5 is pushed toward the ball 3, so that the ball 3 and the feed end valve seat 5 are sealed.

[0041] In this embodiment, the feed end valve seat 5 and the valve cover 2 are clearance-matched, and no seal is used between the two, so the medium pressure P can enter behind the feed end valve seat 5 .

[0042] In one embodiment, a notch is provided at the inner edge of the end of the reactor end valve seat 4 close to the sphere 3, and the notch is suitable for medium filling; the sealing diameter between the reactor end valve seat 4 and the valve body 1 is limited by the notch. Figure 2 As shown, since it is necessary to ensure that the sealing diameter between the valve seat 4 at the reactor end and the valve body 1 is larger than the sealing diameter between the valve seat 4 at the reactor end and the sphere 3, a notch is provided at the inner edge of the end of the valve seat 4 at the reactor end close to the sphere 3, and the medium is filled inside the notch to determine the sealing diameter between the valve seat 4 at the reactor end and the sphere 3, so as to realize the difference in sealing diameter between the valve seat 4 at the reactor end and the valve body 1 and the sphere 3, thereby achieving the purpose of strengthening the seal by using the medium's own pressure.

[0043] In one embodiment, the reactor end valve seat 4 is stepped at one end close to the valve body 1, and the reactor end biasing assembly includes a reactor end pressure ring 601, a reactor end biasing member 602 and a reactor end sealing member 603. A notch is provided on one side of the reactor end pressure ring 601, and the reactor end pressure ring 601 abuts against the end step surface of the reactor end valve seat 4 through the notch; the reactor end biasing member 602 is arranged between the valve body 1 and the reactor end pressure ring 601.

[0044] like Figure 2 As shown, the end of the reactor end valve seat 4 close to the valve body 1 is stepped. After the reactor end valve seat 4 is installed, the end of the reactor end valve seat 4 close to the valve body 1 has a gap with the valve body 1 due to the stepped design. A notch is provided on one side of the reactor end pressure ring 601, and the reactor end pressure ring 601 abuts against the end step surface of the reactor end valve seat 4 through the notch, so the end of the reactor end pressure ring 601 can be as shown. Figure 2The reactor end biasing member 602 is inserted into the gap between the reactor end valve seat 4 and the valve body 1 in the manner shown. At the same time, the reactor end biasing member 602 is arranged between the valve body 1 and the reactor end pressure ring 601. The reactor end biasing member 602 is usually an elastic element, such as a spring. Its main function is to provide a continuous biasing force to force the reactor end valve seat 4 to abut against the ball 3. During the operation of the valve, whether the valve is open or closed, the reactor end biasing member 602 always maintains a certain amount of compression, thereby ensuring close contact between the reactor end valve seat 4 and the ball 3.

[0045] like Figure 2 As shown, the reactor end seal 603 is filled in the gap between the reactor end pressure ring, the end step surface of the reactor end valve seat 4 and the valve body 1. After the valve is installed, there is still a gap between the reactor end pressure ring 601, the end step surface of the reactor end valve seat 4 and the valve body 1. The reactor end seal 603 can completely fill these gaps with its own flexibility and plasticity to form a continuous sealing barrier. When the medium in the reactor attempts to leak through these gaps, the reactor end seal 603 will prevent its flow, ensuring that the medium is confined in the reactor or the valve flow channel to maintain the sealing of the system. At the same time, the reactor end pressure ring 601 not only plays a role in transmitting bias pressure, but also has a certain protection and fixing effect on the reactor end seal 603. The reactor end pressure ring 601 presses the reactor end seal 603 tightly between the end step surface of the reactor end valve seat 4 and the valve body 1, ensuring that the reactor end seal 603 will not be displaced or fall off during operation. The presence of the reactor end seal 603 can also enhance the sealing between the reactor end pressure ring 601 and the valve body 1, and prevent the medium from leaking from the contact portion between the reactor end pressure ring 601 and the valve body 1. The sealing between the reactor end valve seat 4 and the ball 3 is one of the key links of valve sealing, and the role of the reactor end seal 603 is to further strengthen the sealing between the reactor end valve seat 4 and the valve body 1. When the reactor end valve seat 4 abuts against the ball 3 under the action of the reactor end biasing member 602, the reactor end seal 603 simultaneously forms a seal between the reactor end valve seat 4 and the valve body 1, and the double sealing guarantee greatly improves the overall sealing reliability of the valve.

[0046] Among them, the materials of the reactor end seal 603 can be rubber, polytetrafluoroethylene (PTFE), graphite, etc. Rubber seals have good elasticity and flexibility, can adapt to a certain degree of deformation, and perform well in medium and low pressure, non-strongly corrosive chemical media environments. They can effectively fill the tiny gaps in the intervals and prevent media leakage. Polytetrafluoroethylene is known for its excellent chemical stability. It can resist corrosion from almost all chemicals and has an extremely low friction coefficient. It is suitable for severe working conditions such as strong corrosion and high temperature. Even when the medium in the reactor is highly corrosive, it can maintain good sealing performance for a long time. Graphite seals have excellent high temperature resistance and can still maintain a stable sealing effect in high temperature environments. They are often used for valve sealing of high-temperature reactors.

[0047] In one embodiment, Figure 2 As shown, the chemical kettle top valve also includes a sealing ring 8, which is sleeved on the reactor end valve seat 4, and the sealing ring 8 is suitable for abutting against the valve body 1. When the valve is closed, the reactor end seal 603 is filled in the gap between the reactor end pressure ring 601, the end step surface of the reactor end valve seat 4 and the valve body 1, first forming the first sealing defense line to prevent most of the medium from leaking. The sealing ring 8 sleeved on the reactor end valve seat 4 is tightly abutted against the valve body 1, forming the second sealing defense line. Under the action of the medium pressure, the reactor end seal 603 is filled in the gap and is further pressed by the pressure to fit the surface of each component, reducing the possibility of the medium passing through the gap; the sealing ring 8 is elastically deformed under the dual action of its own elasticity and the medium pressure, and is tightly attached to the contact surface between the valve body 1 and the reactor end valve seat 4, blocking the trace leakage of the medium that may pass through the first sealing defense line.

[0048] In one embodiment, Figure 3 As shown, a notch is provided at the end of the feed end valve seat 5, and the sealing diameter between the feed end valve seat 5 and the valve cover 2 is limited by the depth of the notch; the feed end biasing assembly is provided between the notch and the valve cover 2. In this embodiment, the feed end valve seat 5 and the valve cover 2 are clearance-matched, and no seal is used between the two, so the medium pressure P can enter the notch behind the feed end valve seat 5; it can be seen from the above that the sealing diameter between the feed end valve seat 5 and the valve cover 2 is smaller than the sealing diameter between the feed end valve seat 5 and the ball 3, and the feed end valve seat 5 is sealed with the valve cover 2 through the notch provided at its end, so the sealing diameter between the feed end valve seat 5 and the valve cover 2 is limited by the depth of the notch.

[0049] In one embodiment, Figure 3 As shown, the feed end biasing assembly also includes a feed end pressure ring 701, which abuts against the valve cover 2; the feed end biasing member 702 is arranged between the feed end valve seat 5 and the feed end pressure ring 701, and the feed end sealing member 703 is filled in the gap between the feed end pressure ring 701, the feed end valve seat 5 and the valve cover 2.

[0050] like Figure 3 As shown, the abutment between the valve cover 2 and the feed end valve seat 5 is a stepped surface. After the feed end valve seat 5 is installed, a medium cavity is formed at the notch of the valve cover 2 and the feed end valve seat 5. This medium cavity is connected with the middle cavity of the valve body 1 through the gap between the feed end valve seat 5 and the valve cover 2. When the seal of the reactor end valve seat 4 fails, the medium pressure P enters into the medium cavity through the middle cavity of the valve body 1. In order to prevent the medium in the medium cavity from entering into the valve cover 2, the feed end seal 703 is filled in the gap between the feed end pressure ring 701, the feed end valve seat 5 and the valve cover 2 to seal the medium. The feed end biasing member 702 is disposed between the feed end valve seat 5 and the feed end pressure ring 701. The feed end biasing member 702 can provide thrust to the feed end pressure ring 701, so that the feed end pressure ring 701 can always abut against the feed end seal 703, and the medium pressure P inside the medium cavity can also provide thrust to the feed end pressure ring 701, further making the feed end pressure ring 701 abut against the feed end seal 703. At the same time, the feed end biasing member 702 can also provide a force in the direction of the ball 3 to the feed end valve seat 5, so that the feed end valve seat 5 can always abut against the ball 3.

[0051] When in use, the feed end valve seat 5 and the valve cover 2 are clearance-matched, and no seal is used between the two, but the notch is used for sealing. When the medium pressure P enters the notch behind the feed end valve seat 5, since the sealing diameter between the feed end valve seat 5 and the valve cover 2 is smaller than the sealing diameter between the feed end valve seat 5 and the ball 3, the medium pressure will form a pressure difference toward the ball 3 at the notch. This pressure difference makes the feed end valve seat 5 tightly abut against the ball 3 under the dual action of the medium pressure and the biasing component, thereby achieving sealing.

[0052] In one embodiment, the lower end of the valve stem 9 extends into the interior of the valve body 1 and is connected to the sphere 3, and the upper end of the valve stem 9 is connected to an external power structure, and the valve stem 9 is driven to rotate by the external structure, thereby realizing the rotation of the sphere 3. The chemical kettle top valve also includes a pivot 10, and the upper end of the pivot 10 is suitable for rotationally connecting with the bottom of the sphere 3 after passing through the bottom of the valve body 1. The pivot 10 is usually made of high-strength alloy steel and has good wear resistance and fatigue resistance. A mounting hole adapted to the pivot 10 is provided at the bottom of the valve body 1, and the upper end of the pivot 10 is precisely machined to ensure the connection accuracy with the bottom of the sphere 3. A special connection structure, such as a boss, is designed at the bottom of the sphere 3, which is tightly matched with the upper end of the pivot 10. A bearing is provided between the upper end of the pivot 10 and the sphere 3, so that the sphere 3 can flexibly rotate around the pivot 10 to realize the opening and closing action of the ball valve.

[0053] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A chemical kettle top valve, characterized in that: include: A valve body (1) and a valve cover (2), wherein the valve body (1) and the valve cover (2) are connected and through holes inside the valve body (1) and the valve cover (2) are connected to form a valve flow channel; A ball (3) is disposed in the valve flow channel and is movably connected to the valve body (1); the ball (3) is configured to block or open the valve flow channel; Two valve seats, including a reactor end valve seat (4) arranged between the valve body (1) and the ball (3) and connected to the valve body (1), and a feed end valve seat (5) arranged between the valve cover (2) and the ball (3) and connected to the valve cover (2); Two biasing assemblies, including a reactor end biasing assembly arranged between the valve body (1) and the reactor end valve seat (4), and a feed end biasing assembly arranged between the valve cover (2) and the feed end valve seat (5); The biasing assembly comprises a biasing member for forcing the valve seat to abut against the ball (3), and a sealing member filled between the valve seat (4) at the reactor end and the valve body (1) or between the valve seat (5) at the feed end and the valve cover (2); The medium pressure at the end of the reactor end valve seat (4) close to the valve body (1) is greater than the medium pressure at the end close to the sphere (3); and the medium pressure at the end of the feed end valve seat (5) close to the valve cover (2) is greater than the medium pressure at the end of the feed end valve seat (5) close to the sphere (3).

2. The chemical kettle top valve according to claim 1, characterized in that: The medium contact area of ​​the reactor end valve seat (4) close to the valve body (1) is larger than the medium contact area of ​​the feed end valve seat (5) close to the valve cover (2) is larger than the medium contact area of ​​the feed end valve seat (5) close to the ball (3).

3. The chemical kettle top valve according to claim 2, characterized in that: The sealing diameter between the valve seat (4) at the reactor end and the valve body (1) is larger than the sealing diameter between the valve seat (4) at the reactor end and the sphere (3); and the sealing diameter between the valve seat (5) at the feed end and the valve cover (2) is smaller than the sealing diameter between the valve seat (5) at the feed end and the sphere (3).

4. The chemical kettle top valve according to claim 3, characterized in that: The reactor end valve seat (4) is provided with a notch at the inner edge of the end close to the sphere (3), wherein the notch is suitable for medium filling; the sealing diameter between the reactor end valve seat (4) and the valve body (1) is limited by the notch.

5. The chemical kettle top valve according to claim 4, characterized in that: The reactor end valve seat (4) is stepped at one end close to the valve body (1), and the reactor end biasing assembly further comprises a reactor end pressure ring (601), one side of the reactor end pressure ring (601) is provided with a notch, and the reactor end pressure ring (601) abuts against the end step surface of the reactor end valve seat (4) through the notch; The reactor end biasing member (602) is arranged between the valve body (1) and the reactor end pressure ring (601).

6. The chemical kettle top valve according to claim 5, characterized in that: The reactor end seal (603) is filled in the gap between the reactor end pressure ring, the end step surface of the reactor end valve seat (4) and the valve body (1).

7. The chemical kettle top valve according to any one of claims 2 to 6, characterized in that: It also comprises a sealing ring (8), the sealing ring (8) being sleeved on the valve seat (4) at the end of the reactor, and the sealing ring (8) being suitable for abutting against the valve body (1).

8. The chemical kettle top valve according to claim 3, characterized in that: The end of the feed end valve seat (5) is provided with a notch, and the sealing diameter between the feed end valve seat (5) and the valve cover (2) is limited by the depth of the notch; the feed end biasing assembly is arranged between the notch and the valve cover (2).

9. The chemical reactor top valve according to claim 8, characterized in that: The feed end valve seat (5) and the valve cover (2) are clearance-matched, and the medium in the central cavity of the valve body (1) flows into the notch at the end of the feed end valve seat (5) through the clearance between the feed end valve seat (5) and the valve cover (2).

10. The chemical kettle top valve according to claim 8, characterized in that: The feed end biasing assembly further comprises a feed end pressure ring (701), a feed end biasing member (702) and a feed end sealing member (703); the feed end pressure ring (701) is in contact with the valve cover (2); the feed end biasing member (702) is arranged between the feed end valve seat (5) and the feed end pressure ring (701), and the feed end sealing member (703) is filled in the gap between the feed end pressure ring (701), the feed end valve seat (5) and the valve cover (2).

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