Valve

Abstract

The invention discloses a valve which comprises a valve body, a valve plate and an executing mechanism. The valve body comprises two parallel and symmetrical plates, and medium inlet and outlet holes are correspondingly formed in the plates; sealing rings a are symmetrically arranged on the inner surfaces of the two plates of the valve body, and medium inlet and outlet holes in the two plates of the valve body are completely located in holes, with the peripheries closed, of the sealing rings a. The surface of the valve plate is smooth, and the valve plate is tightly clamped between the sealing rings a when the valve is in a closed state; the fastening structure surrounds the radial periphery of the sealing ring a and is arranged on the two plates of the valve body to clamp the two plates of the valve body and / or the sealing ring a; the clamping degree of at least one part of the fastening structure can be adjusted in the direction perpendicular to the surface of the valve body. Through simple and reasonable structural design, good sealing performance is guaranteed, and the valve can be widely applied to various different environments and occasions including normal temperature, high temperature and the like and can replace various existing valves.

Description

[0001] This application is a divisional application; the original application invention title: A valve, application number: 202110317221.1, application date: 2021.03.18. Technical Field

[0002] The invention relates to a valve. Background Art

[0003] Valves are control components in fluid delivery systems, with functions such as shutoff, regulation, flow diversion, backflow prevention, pressure stabilization, flow diversion or overflow pressure relief, etc. They come in a wide variety of varieties and specifications.

[0004] The sealing performance of a valve refers to the ability of each sealing part of the valve to prevent the leakage of the medium. It is the most important technical performance indicator of the valve. There are three sealing parts of the valve: the contact between the opening and closing parts and the two sealing surfaces of the valve seat; the matching part between the packing and the valve stem and the stuffing box; the connection between the valve body and the valve cover. The leakage of the first one is called internal leakage, which is usually called loose closure. It will affect the ability of the valve to cut off the medium. For cut-off valves, internal leakage is not allowed. The leakage of the last two parts is called external leakage, that is, the medium leaks from the inside of the valve to the outside of the valve. External leakage will cause material loss, pollute the environment, and cause accidents in serious cases. For flammable, explosive, toxic or radioactive media, external leakage is even more unacceptable, so the valve must have reliable sealing performance.

[0005] In order to obtain excellent sealing performance, people strive for it, but the results are far from satisfactory.

[0006] Valves used in many occasions, such as the inlet and outlet of smoke exhausters used in refineries, some desulfurization systems and sulfur recovery systems, are required by the state for environmental protection: zero leakage or Class VI sealing of the US standard. It is very difficult to achieve this standard for valves with larger sizes. It is even more difficult to achieve in high-temperature occasions. For example, the inlet valve of a high-temperature smoke exhauster is used in flue gas occasions with a design temperature of more than 700 degrees, with a diameter of 1850, and the process requires zero leakage. This butterfly valve manufactured by Adams Company in Germany is priced at more than 500,000 to 600,000 US dollars per unit. Larger sizes and higher temperatures even exceed 10 million yuan. For example, this butterfly valve with a design temperature of 680℃ and DN2400 imported from Germany is priced at 12 million yuan. The price of this butterfly valve manufactured domestically is also 1 million to 3 million yuan per unit. Even so, after a period of use, due to the erosion and wear of the medium, there are problems of poor sealing and leakage. It is difficult to achieve zero leakage for large-sized butterfly valves unless they are soft-sealed.

[0007] There are also some domestic refineries with catalytic systems. The flue gas temperature is more than 680 degrees. In order to achieve zero leakage, water seal tanks are used to achieve sealing. The disadvantages of this sealing method include:

[0008] 1. Large pressure loss and increased energy consumption: The flue gas returns from the bottom of the inner tube to the outlet above the outer tube, making two bends, resulting in large pressure loss;

[0009] 2. Large investment: about 1 to 3 million yuan;

[0010] 3. Large area: It occupies additional land and wastes land resources;

[0011] 4. Pollution to the environment: The water used for water seal is polluted by flue gas to form acidic water. If it is discharged directly, it will pollute the environment. If it is discharged after treatment, the treatment cost will be high.

[0012] 5. High cost of use and maintenance: Flue gas is hot, and water needs to be circulated to prevent freezing. A complete control system is also required. Antifreeze and insulation measures need to be taken in some cold regions, and water needs to be replenished during operation. The maintenance of these equipments costs about 8-10% of the investment amount each year, and the equipment operation costs hundreds of thousands of yuan each year;

[0013] 6. Reliability is worse than valves: There are many types of equipment and instruments used in the water seal system, which increases the failure points, so the reliability is poor; in addition, the high-temperature sulfur-containing flue gas corrodes the inner tube after reacting with water, which can easily cause the inner tube to fall off. Several cases of inner tube falling off have occurred in China.

[0014] Gas sites also use many water-sealed tanks and need to take anti-freeze measures, which undoubtedly increases the corresponding costs and problems.

[0015] In order to achieve zero emission, some enterprises adopt double-layer butterfly valves or two plug-in valves to add blower positive pressure ventilation to achieve zero leakage. The structure is complex and the cost is high. The size of the valves used in this occasion is often large. Due to the large deformation caused by the temperature and medium pressure during manufacturing, transportation, installation and use, it is very difficult to achieve zero leakage. Because of the large deformation caused by various reasons, the double-layer butterfly valve or two plug-in valves are ventilated by blowers to form wind curtains to achieve sealing. The air volume required for positive pressure ventilation with blowers is large, and it consumes electricity for a long time, so the energy consumption is very large. In addition, according to the requirements of national standards or departmental standards, when sealing air is used to achieve sealing, the sealing air needs to be heated to above 100℃, and the hot sealing air is blown away at any time, which consumes huge energy. This not only further increases energy consumption, but also the hot sealing air is equivalent to steam, which will form a large amount of water in the pipeline, which will corrode equipment and pipelines after reacting with harmful media, and form agglomeration, scaling and crystallization after mixing with dust, which will seriously affect the sealing and switching of valves. There are too many such examples to list. The applicant has entered several desulfurization flues and witnessed the above situation. The applicant has also studied various valves and used the studied valves in various different occasions, and has experienced many drawbacks.

[0016] For example, the Chinese patent "Smoke damper door and its sealing device, authorization announcement number CN201526980U" uses an inflatable sealing tube to achieve sealing. Its disadvantage is that the sealing material is made of rubber, which is not resistant to high temperatures and the sealing material is prone to aging. Another example is the sealing structure of the Chinese patent "Gate valve, application publication number CN104006176A" has the same problem.

[0017] Another example is the Chinese patent "An explosion-proof electric open-type gate valve, authorization announcement number CN204592362U", which has the advantage of good sealing performance. Its shortcomings are also quite prominent, including:

[0018] 1. Large pressure loss and increased energy consumption: In order to ensure that the sealing surface is not eroded, the valve diameter is reduced to protect the sealing surface, which will increase the pressure loss of the valve and thus increase energy consumption;

[0019] 2. Complex structure, high manufacturing cost, and affect the reliability of use: Compared with the conventional plug-in valve, it has an additional valve seat (piston valve seat) and a valve seat sleeve. According to common sense, it is necessary to lose the piston actuator, and even large-sized valves may require multiple sets. Such a complex structure increases the manufacturing cost: if used in high-temperature applications, high-alloy steel is required, and the cost of raw materials increases; and relative movement can occur between the valve seat and the valve seat sleeve; when the size of the valve seat and the valve seat sleeve is large or impurities enter between the valve seat and the valve seat sleeve, the two are easily stuck; and there is a valve cover 4 for accommodating the entry and exit of the plug-in 2. This valve The cover 4 is equivalent to a box, that is, there is one more box than the conventional plug valve, and the box not only increases the manufacturing cost, but also has a dead zone inside, which is easy to accumulate dust. If it is used for flue gas media such as sulfur, the cold and hot walls inside are prone to condensation. The water formed by condensation will react with the flue gas to form a corrosive medium to corrode the equipment. At the same time, the formed water will agglomerate, scale, and crystallize with the dust in the flue gas, seriously affecting the opening and closing and sealing of the valve. At this time, the valve seat and the valve seat sleeve are likely to get stuck due to agglomeration; for example, the valve seat below the valve body forms a groove, and the accumulation of dust in this groove affects the closing of the valve. After the condensed water enters this groove, it is easy to agglomerate, scale, crystallize, and even freeze with the dust in the medium; the above factors not only make its structure complex, difficult to manufacture, and increase the cost, but also naturally affect its reliability in use.

[0020] Another example is the Chinese patent "A two-way sealed knife gate valve, authorization announcement number CN203453505U", which has the advantages of novel conception, but its shortcomings are as follows:

[0021] 1. Various factors in the actual application process make it impossible to achieve truly effective sealing: First, when the gate valve is connected to the pipeline on site, if the movable elastic sealing sleeve is in the pipeline, the compression force of the sealing ring and cannot be adjusted. If the outer axial end face of the elastic sealing sleeve 3 is connected to the pipeline on site, due to the large deformation often caused during on-site installation, it is even more so for valves of large size (there is almost no on-site installation without deformation, and there are also deformations caused by the aforementioned various factors). This can easily displace the upper part of the movable elastic sleeve 3 axially outward, because this part on the upper side is the weakest, resulting in: the upper part of the sealing ring is very likely not to contact the valve plate, and the upper part of the sealing ring on the other side may also be the same. At this time, it is difficult to tighten the sealing ring through the elastic sealing sleeve by screws, especially after the valve body is torsionally deformed, and the sealing effect is out of the question; second, in high-temperature environments, rubber cannot be used for sealing fillers, and graphite packing is usually used, as stated in the instruction manual Figure 2 The sealing packing and the sealing ring 10 below the middle screw 9 are both made of graphite packing. When the sealing ring 10 is worn, if it is re-tightened by the elastic sealing sleeve, since the sealing packing below the screw 9 is not worn, interference problems will occur during re-tightening, and it is actually difficult to tighten, so the seal cannot be achieved; furthermore, the diameter of the valve stem 6 is usually several tens of millimeters, the diameter of the valve stem nut 11 is larger than the diameter of the valve stem 6, and the valve cover plate connected to the movable elastic sealing sleeve is thick, and the axial length of the movable elastic sealing sleeve is long, so that its axial rigidity is large and the elasticity is poor, which makes it difficult to ensure that the sealing ring 10 and the sealing ring 8 on the other side are tightened everywhere; similarly, practice has also proved that when the valve body is torsionally deformed, it is almost impossible to tighten it completely, and there is no way to talk about sealing.

[0022] 2. There are many machined parts, the structure is complex, the cost is high and the reliability of use is difficult to ensure: Similar to the previous patent, the dust accumulation in the groove under the valve body affects the closing of the valve, and the condensed water entering the groove is easy to agglomerate, scale, crystallize and even freeze with the dust in the medium, which seriously affects the reliability of use.

[0023] In fact, many gate valves at home and abroad are similar to the above structure, and the above technical problems are common.

[0024] A single-plate eye valve (open type) manufactured by Germany's ZMMERMANN & JANSEN Company, the United States' SchuF Company and Tianjin Tanggu Jinbin Valve Co., Ltd. Figure 1 As shown, an expansion joint is required for compression. The double plate eye valve (closed type) they manufacture has two similar boxes symmetrically fixed on both sides of the axis outside the valve body, such as Figure 2As shown, it has the same problems as the aforementioned Chinese patent "An explosion-proof electric open-type plug-in valve, authorization announcement number CN204592362U", such as complex structure, increased manufacturing cost and dust accumulation and condensation in the box; at the same time, the eye valve of this structure has sealed cavities on both sides, and when the size is large, a head must be used. There are N actuators outside the valve body that press the valve plate, and the whole is particularly bulky. Naturally, its manufacturing cost, transportation cost, installation and maintenance cost, etc. are correspondingly increased, and its reliability of use is inevitably reduced.

[0025] The American company SchuF also manufactures a double-plate eye valve that combines open and closed types. Figure 2 On the basis of the invention, a guide rail is fixed above the valve, and the sealing chambers on both sides are hung on the guide rails. The sealing chambers on both sides can be separated from the valve body. The advantages of this structure are: after the sealing chamber is opened, there will be no internal leakage, and external leakage can also be checked. Its disadvantages are: in addition to the problem of the above-mentioned eye valve, after the sealing chamber is opened, the space occupied is particularly large, which is equivalent to the width of 4-5 valve bodies, and the sealing surfaces and guide rails between the two valve bodies and the sealing chamber are added. When the valve is closed, in order to prevent internal leakage, the sealing chamber must be opened. If the medium in the chamber is toxic or flammable, there is a safety hazard, and more troublesome measures need to be taken. After the sealing chamber is opened, debris may enter the chamber or the sealing surface and the sealing surface with the valve body may freeze, which will affect the reliability of use and may damage the soft seal between the two.

[0026] In addition, other types of valves, such as the Chinese patent "Flue damper hinge four-link sealing mechanism, authorization announcement number CN201100649U" and "Four-link mechanism sealing door, authorization announcement number CN202165597U", take up less space, have a simple structure and good sealing effect compared to the existing flapper valve. However, there are the following shortcomings:

[0027] 1. The manufacturing accuracy and deformation caused by manufacturing, transportation, installation and use make it difficult to achieve zero leakage. When the size is large, the unavoidable deformation makes it even more difficult to achieve zero leakage. The position accuracy of the four-link rod is strictly required. In addition, the lengths of the four-link rod are different, and the different thermal deformations can easily cause displacement between the valve plate and the valve seat, which can easily cause a gap and affect the sealing effect.

[0028] 2. The four-bar linkage inside the flue has several friction pairs. When the medium in the flue contains dust, it is easy to get stuck, especially after condensation inside, the dust forms agglomerates and scales, which makes it easier for the friction pairs to get stuck or locked. Because it is located inside the flue, it cannot be lubricated. If it is stuck, it cannot be repaired without disassembly. If it needs to be repaired, it needs to be suspended from a high altitude, which is expensive and takes a long time to repair. This can easily cause production suspension and losses.

[0029] 3. When used in high temperature applications, the four-bar linkage must use expensive high alloy steel, which makes it expensive. In some high temperature applications, the valve body is required to have a heat-insulating and wear-resistant lining, such as: the medium temperature is 680°C, that is, the temperature of the valve trim is 680°C. With the heat-insulating lining, the temperature of the valve body is less than 200 degrees, and the expansion difference between the annular valve seat in the valve body and the valve body exceeds 1%, resulting in a collision between the valve plate and the valve body, which will produce yield or high temperature creep, thus affecting the seal.

[0030] A loose valve seal will result in non-compliance with environmental standards; and hot flue gas will flow back, which will corrode the fan and prevent people from entering the flue for construction.

[0031] It can be seen that the sealing problem of valves has always been a technical problem in this field, especially for large-sized valves. It includes processing and manufacturing accuracy, deformation caused by transportation and installation, deformation caused by medium temperature and pressure during use, and dust or impurities on the valve seat during use that affect the seal and particles in the medium erosion and wear of the sealing surface. When a valve with a thermal insulation lining and an annular valve seat in the valve body is used in high-temperature environments, the deformation of the valve seat and the high-temperature creep of the valve seat and the valve body will undoubtedly affect the effective sealing of the valve.

[0032] In many cases of solid materials, a large number of gate valves are used. It is difficult to achieve a tight seal between the gap between the gate and the valve seat and the sealing part of the valve plate in and out, resulting in problems of internal and external leakage of materials, which brings a lot of trouble. Summary of the invention

[0033] In view of the strict requirements on valve sealing performance in actual production and life and the various difficulties existing in valve sealing in the prior art, the present invention discloses a valve which, through a simple and reasonable structural design, can realize convenient and timely adjustment of the clamping force of corresponding parts of the sealing ring outside the valve and replacement of the sealing ring outside the valve.

[0034] The technical solution of the present invention is achieved in this way:

[0035] A valve comprises a valve body, a valve plate and an actuator; the valve body comprises two plates which are parallel and symmetrical to each other and on which medium inlet and outlet holes are correspondingly provided;

[0036] Sealing rings a are symmetrically arranged on the inner surfaces of the two plates of the valve body, and the medium inlet and outlet holes on the two plates of the valve body are completely located within the circumferentially closed holes of the sealing rings a;

[0037] The valve plate is tightly sandwiched between the sealing rings a when the valve is in a closed state;

[0038] The fastening structure surrounds the radial periphery of the sealing ring a and is arranged on the two plates of the valve body to clamp the two plates of the valve body and / or the sealing ring a; at least a part of the fastening structure can adjust its clamping degree along a direction perpendicular to the surface of the valve body.

[0039] Specifically, in order to ensure the sealing of the valve body, the fastening structure includes a screw connection structure and / or a valve body external connection structure;

[0040] The screw connection structure includes a through-type screw and nut structure, or further includes a top screw a;

[0041] The through-type screw nut structure is perpendicular to the two plate surfaces of the valve body and penetrates the two plates and is evenly installed on the periphery of the sealing ring a and at positions other than the port where the valve plate enters and exits the valve body;

[0042] The top screws a are evenly and symmetrically arranged on the channel steel a. The channel steel a is buckled in pairs on the outer surfaces of the two plates of the valve body corresponding to the ports where the valve plate enters and exits the valve body. The top screws a press the corresponding plates of the valve body from the outer side of the bottom plate of the channel steel a inward; both ends of the channel steel a protrude outside the valve body, and through-type screw nuts are installed at both ends of each pair of channel steels a; obviously, the arrangement of the channel steel and the top screws thereon more effectively guarantees and improves the sealing effect of the corresponding sealing ring parts where the valve plate enters and exits the valve body.

[0043] The valve body external connection structure includes a support ear and a through-type connection piece a;

[0044] The lugs are fixedly connected to the outer walls of the two pipe nipples on both sides of the valve body and are symmetrically arranged relative to the two plates of the valve body. The two pipe nipples are respectively fixedly connected to the medium inlet and outlet holes of the two plates of the valve body and have a diameter equivalent to that of the on-site pipeline, that is, the diameter of the pipe nipples is the same as or similar to that of the on-site pipeline; more than two lugs on each pipe nipple are evenly arranged around the pipe wall of the pipe nipples, the bottom plate of the lugs exceeds the side edge of the valve body, and the through-type connector a connects and clamps the two lugs symmetrically arranged on both sides of the valve body in a direction parallel to the axis of the pipe nipples;

[0045] The through-type connector a is a screw-nut structure or a steel section or a steel pipe; the screw-nut structure includes a screw that penetrates the two symmetrical lug bottom plates and nuts that are respectively tightened inward from the outside of the lug bottom plates, or also includes nuts located on the inside of the lug bottom plates; the steel section or steel pipe penetrates the two symmetrical lug bottom plates to form a fixed connection. When the through-type connector a is a screw-nut structure, the adjustable clamping effect of the two plates of the valve body and the valve plate and the sealing ring inside the valve body can be achieved only through the valve body outer connection structure;

[0046] Alternatively, the valve comprises a pipeline nipple and a positioning structure;

[0047] The two pipe nipples are respectively fixedly connected to the medium inlet and outlet holes of the two plates of the valve body and extend into the plates of the valve body; the two pipe nipples have a diameter equivalent to that of the on-site pipeline; the radial inner edge of the sealing ring a is attached to the outer wall of the pipe nipples;

[0048] The positioning structure is located radially outside the sealing ring a, fixed on the inner surface of the plate of the valve body and has no contact with the valve plate; the positioning structure has a positioning surface P1, which abuts against the radial outer edge of the sealing ring a; or the positioning structure also has a fixing surface P2 connected to the positioning surface P1 at a right angle or an obtuse angle, which lies on the inner surface of the plate of the valve body corresponding to the sealing ring a and is connected to the plate of the valve body;

[0049] The fastening structure includes a threaded structure and / or a valve body external connection structure;

[0050] The screw connection structure includes a top screw b, or also includes a through-type screw and nut structure;

[0051] The top screw b is evenly arranged corresponding to the sealing ring a, and is vertically screwed into the valve body from the outer surface of the plate of the valve body and pushes the gasket to tighten the sealing ring a and the valve plate. The gasket is arranged between the inner surface of the plate of the valve body and the sealing ring a corresponding to the sealing ring a; the through-type screw nut structure is evenly and symmetrically arranged outside the radial outer edge of the sealing ring a, connecting the plate of the valve body and the surface P2 of the positioning structure;

[0052] The valve body external connection structure includes a support ear and a through-type connection piece a;

[0053] The lugs (see Part 3 of the container support: Lug-type support JB / T-4712.3-2007) are fixedly connected to the outer walls of the two pipe nipples on both sides of the valve body and are symmetrically arranged relative to the two plates of the valve body. More than two lugs on each pipe nipple are evenly arranged around the pipe wall of the pipe nipple. The bottom plate of the lugs exceeds the side edge of the valve body. The through-type connector a connects and clamps the two lugs symmetrically arranged on both sides of the valve body in a direction parallel to the axis of the pipe nipple.

[0054] The through-type connecting piece a is a screw-nut structure or a steel section or a steel pipe; the screw-nut structure includes a screw that penetrates the two symmetrical lug base plates and nuts that are respectively tightened from the outside of the lug base plates to the inside, or also includes nuts located on the inside of the lug base plates; the steel section or steel pipe penetrates the two symmetrical lug base plates to form a fixed connection.

[0055] Furthermore, a rib a is provided in the pipeline nipple downstream of the valve plate and close to the valve plate. The rib a is usually in the shape of a long strip, and a plurality of ribs are provided perpendicular to the surface of the valve plate and parallel to each other. At least one end of each rib a is fixed to the inner wall of the pipeline nipple. The rib a is provided as a reinforcing structure to reduce the thickness of the valve plate to reduce the cost while improving and ensuring the ability of the valve plate to withstand the medium pressure.

[0056] Usually, in the absence of expansion difference, both ends of the rib plate a are fixed to the inner wall of the pipe nipple.

[0057] When used with a thermal insulation layer or a thermal insulation and wear-resistant lining and a pipeline, the valve body and the pipeline short section are also provided with a thermal insulation layer or a thermal insulation and wear-resistant lining. In this case, in order to overcome or avoid the problem of butt-locking caused by the large expansion difference between the rib plate a and the valve body and the pipeline short section, the rib plate a is provided with a fixed end and a non-fixed end, that is, one end of the rib plate a is fixed in the pipeline short section, and the other end does not contact the inner wall of the pipeline short section and there is a spacing Δs, and Δs is not less than the expansion difference between the rib plate a and the pipeline short section;

[0058] Furthermore, in order to ensure the rigidity of the rib a in this case, a limiting structure a is provided on the inner wall of the pipe short section adjacent to the non-fixed end corresponding to the position of the non-fixed end of the rib a, and the limiting structure a limits the displacement of the non-fixed end of the rib a from one or both sides of the non-fixed end. Specifically, the limiting structure a can be a support ear with a bottom plate: in terms of the flow direction of the medium, the bottom plate of the support ear is fixed near the downstream of the rib a, and the two ear plates on the support ear are located on both sides of the non-fixed end of the rib a, that is, the two ear plates on the support ear sandwich the rib a therebetween, and the two ear plates are parallel to the rib a.

[0059] Furthermore, in order to avoid excessive displacement of the sealing ring a, a limiting structure b is provided on the inner surfaces of the two plates of the valve body and adjacent to the sealing ring a, corresponding to the sealing ring a, to limit or prevent the displacement of the sealing ring a relative to the plates of the valve body; the limiting structure b has no contact with the valve plate to ensure the sealing effect between the sealing ring a and the valve plate.

[0060] Specifically, the limiting structure b is a groove; the sealing ring a is embedded in the groove and is higher than the groove, thereby avoiding contact between the valve plate and the groove, ensuring that the sealing ring a fits the valve plate to achieve a sealing effect.

[0061] Or, specifically, the limiting structure b includes an inner baffle (ring) and / or an outer baffle (ring); along the radial direction of the sealing ring a, the inner baffle (ring) is fixed to the inner side of the sealing ring a, and the outer baffle (ring) is fixed to the outer side of the sealing ring a. Similarly, in order to ensure the fit between the sealing ring a and the valve plate to obtain a sealing effect, the height of the inner baffle (ring) is lower than the sealing ring a; at the same time, the design of the outer baffle (ring) is intended to further improve the ability of the sealing ring a to withstand the medium pressure, prevent the displacement of the sealing ring a and the resulting poor sealing problem, and accordingly, the height of the outer baffle (ring) is usually lower than the sealing ring a; on the other hand, the height of the outer baffle (ring) can also be designed to be higher than the sealing ring a according to specific needs, and the outer edge size of the valve plate should be smaller than the inner edge size of the outer baffle (ring), that is, the outer baffle (ring) is not only used to limit the displacement of the sealing ring a, but also to limit the running track of the valve plate. Taking into account the convenience of replacement and maintenance of the sealing ring and in order to avoid the problems caused by welding deformation, the outer baffle plate (ring) can usually be made of angle steel, and the angle steel serving as the outer baffle plate (ring) is screwed to the plate of the valve body at one surface thereof that is in contact with the plate of the valve body using fasteners such as screws and nuts; when the height of the angle steel is higher than the sealing ring a, the angle steel not only limits the displacement of the sealing ring a, but also acts as a guide rail of the valve plate, thus killing two birds with one stone.

[0062] Since the inner baffle plate and the outer baffle plate are usually respectively surrounded on the inner side and the outer side of the sealing ring a along the radial direction of the sealing ring a, they can also be called inner baffle ring and outer baffle ring. The inner baffle plate and the outer baffle plate can be divided into several sections to surround the inner side and the outer side of the sealing ring a.

[0063] Specifically, taking into account the difference in expansion coefficients between the sealing ring a and the inner / outer baffle plates (rings) in a high temperature environment, in order to avoid damage to the sealing ring by the inner / outer baffle plates (rings) caused by thermal expansion, a gap of no less than the expansion difference between the inner baffle plate (ring) and the outer baffle plate (ring) and the sealing ring a is provided in the radial direction.

[0064] In order to reduce the influence of the stiffness of the inner / outer baffle plate (ring) on ​​the clamping force of the regulating sealing ring, the inner baffle plate (ring) and / or the outer baffle plate (ring) are provided with a fracture or cutout on the surface opposite to the sealing ring a, along a direction roughly perpendicular to the plate of the valve body.

[0065] Usually, in order to make the sealing ring bear force evenly and to facilitate replacement of the sealing ring or adjustment of its pressing force, the sealing ring a is set to be square or rectangular, which can be applicable to circular pipes as well as square or other shaped pipes;

[0066] In order to reduce the friction when the valve plate moves in and out and improve the sealing performance, the sealing ring a is usually made of packing, polytetrafluoroethylene plate, or a composite plate composed of a polytetrafluoroethylene plate and a rubber plate; the packing includes graphite packing, ceramic packing, etc.; in specific occasions, graphite packing containing carbon fiber, graphite packing with dynamic compensation function, etc. can be used.

[0067] Furthermore, the sealing ring a can be a combination of two or more sealing rings. In order to compensate for the wear of the sealing ring at any time, a spring is installed between the fastening structure on the valve body for compressing the seal, including the screw nut and the top screw, and the valve body.

[0068] In order to prevent the sealing ring from being damaged when the valve plate is switched, and to reduce the wear of the sealing ring when the valve plate enters and exits the valve body, it is more preferred that the inner surface of the hole on the valve plate gradually expands from the middle to both sides along its radial direction, or the transition from the inner and outer surfaces of the valve plate to the inner surface of the hole thereon is a smooth concave without edges. For example, the inner surface of the hole of the valve plate (whether it is a round hole or a square hole) can be in the shape of a sharp knife, or in the shape of a positive cone when viewed from the radial direction of the hole. Alternatively, the end t1 of the valve plate entering and exiting the valve body is in the shape of a knife edge.

[0069] In order to ensure the movement trajectory of the valve plate and reduce the use of guide rails when the valve plate is switched, the actuator includes an actuator, a fixed frame, a sprocket, a chain and a long axis; the fixed frame is connected to the valve body, and the four sprockets are respectively fixed at the four corners in the fixed frame, two of which are respectively fixed to the long axis, and the long axis is connected to the output end of the actuator, and the two chains are respectively connected to the valve plate through connecting parts b.

[0070] The actuator can be electric, pneumatic or hydraulic.

[0071] In order to eliminate the influence of scaling on the valve plate surface on the valve closing and sealing performance, it is more preferable to provide a scraper on the inner side of the two plates of the valve body corresponding to the end position of the valve plate entering and exiting the valve body; when the valve plate enters and exits the valve body, the scraper is in contact with the surface of the valve plate.

[0072] In some use cases, after the valve is closed, condensation, scaling or crystallization will inevitably occur on the cold and hot walls of the valve plate. In order to avoid this phenomenon, an electric heater is fixed in the pipe nipple to extend into the valve body for heating;

[0073] Furthermore, in order to prevent dust from accumulating on the surface of the electric heater and affecting its heating performance, a shield is also provided in the pipe nipple corresponding to the upstream adjacent position of the heater in terms of the medium flow direction.

[0074] Alternatively, the valve plate is a composite valve plate with a thermal insulation interlayer, that is, the valve plate is a composite structure formed by sandwiching a thermal insulation layer between the inner and outer surfaces.

[0075] Specifically, the valve may be a glasses valve.

[0076] As a glasses valve, the valve can further form the following double-plate glasses valve structure:

[0077] Specifically, the two plates of the valve body extend in the direction of opening the valve, and a circumferentially closed sealing ring b is sandwiched in the extended plate to form a sealed cavity;

[0078] The sealing ring b is in close contact with the sealing ring a on one side adjacent to the valve body and has a valve plate inlet and outlet A;

[0079] When the valve is in the open state, the valve plate is tightly sandwiched between the sealing rings b, and the internal space of the sealing cavity is sufficient to accommodate the opening of the valve plate inserted therein;

[0080] The fastening structure is arranged on the outer surface of the sealing cavity to uniformly surround and clamp the extension plate of the valve body and the sealing ring b therein along the radial periphery of the sealing ring b; at least a part of the fastening structure can adjust its clamping degree along a direction perpendicular to the surface of the extension section of the valve body;

[0081] Specifically, the fastening structure includes a through-type screw and nut structure or a fastener, or also includes a top screw a.

[0082] Furthermore, similar to the sealing ring a and its limiting structure b, a limiting structure b' is provided on the inner surface of the valve body extension plate corresponding to the sealing ring b to limit or prevent displacement of the sealing ring b relative to the valve body plate; the limiting structure b' has no contact with the valve plate.

[0083] Similar to the limiting structure b, the limiting structure b' is a groove; the sealing ring b is embedded in the groove and is higher than the groove; or, the limiting structure b' includes an inner retaining ring and / or an outer retaining ring; along the radial direction of the sealing ring b, the inner retaining ring is fixed to the inner side of the sealing ring b, and the outer retaining ring is fixed to the outer side of the sealing ring b; there is a radial gap between the inner retaining ring and the outer retaining ring and the sealing ring b that is not less than the expansion difference between the two.

[0084] Similarly, similar to the sealing ring a, the sealing ring b is usually square or rectangular, and is made of packing, polytetrafluoroethylene plate, or a composite plate composed of a polytetrafluoroethylene plate and a rubber plate; the packing includes graphite packing, ceramic packing, etc.; in specific occasions, graphite packing containing carbon fiber, graphite packing with dynamic compensation function, etc. can be used.

[0085] Compared with the prior art, the benefits of the present invention are as follows:

[0086] The present invention has a simple structure, is easy to manufacture, and is more convenient to install, use and maintain. Most importantly, because the clamping force of the valve body and the sealing ring can be monitored and adjusted in time from the outside at any time, the valve described in the present invention fully guarantees its safety and reliability including sealing performance during use, thereby effectively controlling its costs including raw materials, manufacturing, use and maintenance, and more realistically and effectively solving the valve sealing problem that has long plagued technicians in related fields; it can be widely used in valves of different varieties and specifications including eyeglass valves, plug-in valves, etc., and can be widely used in various environments and occasions including normal temperature and high temperature.

[0087] Specifically, compared with existing eyeglass valves, plug valves and other valves, the advantages of the eyeglass valve disclosed in the present invention include:

[0088] 1.1. The sealing performance of the valve described in the present invention can be monitored from outside the valve body, and the pressing force of the sealing ring can be adjusted in time from the outside, thereby ensuring the sealing performance of the valve during use. Even if the sealing ring is worn, the pressing force of various parts of the sealing ring can be adjusted from the outside at any time, and the two plates constituting the valve body at the parts pressing the sealing ring have small rigidity, large elasticity and high resilience. Therefore, the pressing force of various parts is easy to adjust, so the sealing performance can be always guaranteed, which is not available in various existing valves.

[0089] 1.2. The extended sections of the two plates of the valve body of the valve described in the present invention and the annular sealing ring form a sealed cavity. Only a small amount of medium enters this cavity when the valve is switched, or air with a pressure greater than the medium pressure can be introduced during the switch to prevent the medium from entering this cavity. For example, sulfur-containing flue gas will not exist in the cavity for a long time, so condensation, scaling, agglomeration, and crystallization can be effectively reduced or even avoided, ensuring flexible and reliable switching and sealing performance. At the same time, it is prevented that the water after condensation reacts with the medium to corrode the valve and pipeline or the insulation lining.

[0090] 1.3. For the valve of the present invention, since the sealing ring or sealing packing can be easily replaced on the outside of the valve, there is no need to disassemble the valve, thereby reducing the cost of inspection and maintenance, and avoiding the risk of maintenance personnel entering the pipeline for construction without disassembling the valve and various troubles and problems caused by this, including such as if entering the pipeline for construction, it is necessary to replace it with air, analyze the medium composition in the pipeline after replacement, and someone must be on guard during construction. The maintenance content of this valve is basically to replace the sealing ring or sealing packing.

[0091] 1.4. The valve described in the present invention has no valve seat in terms of structural design, compared with the existing plug-in valve, so there is no pressure loss and it is more energy-saving; there is no hidden danger of dust accumulation and wear at the corresponding valve seat position, and the valve is not closed tightly and the sealing is not good as a result; there is no guide rail, and no need for a precise valve plate track, so there is no risk of the track jamming the valve plate; there is no clamping mechanism between the valve plate and the valve seat, which naturally reduces the machining work, reduces the overall precision requirements, and is easier to manufacture. Furthermore, compared with the existing single-plate eye valve, the present invention eliminates the expansion joint and multiple sets of actuators for clamping the valve plate; compared with the existing double-plate eye valve, the present invention lacks the sealing cavity on both sides and the corresponding external reinforcement facilities or heads of the sealing cavity; in addition, the structural design of the present invention allows it to use a thinner valve plate, which reduces the cost, and at the same time allows the valve body to be made lighter, which naturally reduces the requirements for the valve support components. Similarly, the valve described in the present invention will not produce scaling, caking, or crystallization, ensuring flexible and reliable switching, and also ensuring sealing performance. For applications where a thermal insulation lining is required to be cast inside the valve body, the expansion difference between the annular valve seat in the valve body of a conventional valve and the valve body exceeds 1%, which will cause the valve body and the valve plate to yield or creep at high temperature, thereby affecting the seal; the valve described in the present invention does not have the above-mentioned annular valve seat, and the valve plate can expand freely, which fundamentally avoids the occurrence of this problem and solves this technical problem that has long plagued the field; and because the high-alloy steel used in high-temperature applications is usually very expensive in terms of raw material cost, such as 06Cr25Ni20 steel, which costs 40,000 to 80,000 yuan per ton, and the valve described in the present invention has a simpler structure, the use of raw materials is greatly reduced, and naturally the corresponding material and manufacturing costs are greatly reduced.

[0092] 1.5. The valve of the present invention does not need to be used with a blower or hot sealing air to achieve sealing. When necessary, an electric heater is used to prevent condensation, which greatly reduces energy consumption.

[0093] 1.6. Fewer parts reduce costs, improve reliability of use, and reduce maintenance costs.

[0094] In short, the present invention has an ingenious design, a simple structure, is easy to manufacture, convenient to use and maintain. In particular, the split-type structure of the valve body cleverly ensures good sealing performance, and solves all the technical problems that have long plagued the valve field due to poor sealing in the prior art. It saves energy and reduces consumption while ensuring safe and reliable performance even in high temperature environments. Accordingly, the overall cost, including raw materials, manufacturing, installation, use, maintenance and supporting facilities construction, is effectively controlled, which will surely gain the trust and welcome of the majority of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0095] Figure 1 This is a real photo of the commonly used single-plate eye valve;

[0096] Figure 2 This is a real photo of the commonly used double-plate eye valve;

[0097] Figure 3 2 is a schematic structural diagram of a single-plate eye valve according to Embodiment 1 of the present invention;

[0098] Figure 4 yes Figure 3 Left view of

[0099] Figure 5 2 is a schematic structural diagram of a double-plate eye valve according to Embodiment 2 of the present invention;

[0100] Figure 6 yes Figure 5 Left view of

[0101] Figure 7 yes Figure 5 BB cross-section view

[0102] Figure 8 to Figure 12 1 is a schematic diagram of the limiting structures b, b' of the sealing ring a and / or the sealing ring b according to the third embodiment of the present invention and the square sealing ring a and / or the sealing ring b; wherein,

[0103] Figure 8 is a schematic diagram of a sealing ring a according to Embodiment 3 of the present invention, in which the limiting structure b is a groove;

[0104] Fig. 9 yes Figure 8 CC section view;

[0105] Fig.10 It is a schematic diagram of the limiting structure b of the sealing ring a of the single-plate glasses valve or the plug-in valve described in Example 3 of the present invention, which is an inner baffle plate (ring) and an outer baffle plate (ring);

[0106] Fig.11 Schematic diagram of the limiting structure b of the sealing ring a and the sealing ring b of the double-plate glasses valve described in Example 3 of the present invention, wherein b' is an inner baffle plate (ring) and an outer baffle plate (ring);

[0107] Fig.12 yes Fig.11 DD cross-sectional view;

[0108] Fig.13 The through-type connecting member a of the valve body connecting structure of the valve described in the embodiment of the present invention is a schematic diagram of the structure of a steel pipe or steel section;

[0109] Figure 14-15 is a schematic structural diagram of a circular medium inlet and outlet hole on a valve plate and an inner surface of the hole according to an embodiment of the present invention, Fig.15 yes Fig.14 FF cross-section diagram;

[0110] Figure 16-17 is a schematic diagram of a structure of a medium inlet and outlet hole on a valve plate that is square and the hole according to an embodiment of the present invention, Fig.17 yes Fig.16 GG profile diagram;

[0111] Fig.18 It is a schematic structural diagram of an electric heater and a shield in a pipe nipple connected to a valve body according to the present invention;

[0112] Fig.19 A schematic diagram of a valve plate composite structure according to the present invention;

[0113] Figure 20-21 This is a schematic diagram of the structure of a valve body with a thermal insulation lining according to Example 4 of the present invention; Fig.21 yes Fig. 20 HH profile of;

[0114] Fig. 22 is a schematic structural diagram of Embodiment 5 of the present invention;

[0115] Figure 3 , 5 20 and 21 are schematic diagrams of a valve with a rib plate a and related structures described in Example 4 of the present invention;

[0116] In the figure:

[0117] 100. Actuator 101. Electric actuator 102. Actuator fixing frame 103. Chain 104. Sprocket 105. Long shaft

[0118] 200. Valve body 211, 212. Valve body plate 220. Sealing cavity 221, 222. Extension plate of valve body plate 230. Pipeline nipple

[0119] 311, 312. Sealing ring a 313 Sealing material a 314. Groove 315. Inner baffle (ring) 316. Outer baffle (ring) 317. Support plate 320. Sealing ring b

[0120] 410, 420. Valve plate 411 / 421, 412 / 422. Inner and outer plates of the valve plate 413 / 423. Insulation interlayer of the valve plate 421, 422. Long strip plate structure

[0121] 511, 512, 513, 514, 515, 516, 517. Fasteners

[0122] 521, 522, 522. Top wire b

[0123] 530. Valve body external connection structure 531. Lug 532. Screw nut 533. Steel or steel pipe

[0124] 540. Pull the ear

[0125] 551. Positioning angle steel 552. Pad

[0126] 560.Connectors

[0127] 610. Channel steel a

[0128] 710. Rib plate a 720. Limiting lug (a type of limiting structure a) 721. Limiting plate 722. Bottom plate 730. Rib plate

[0129] 910. Thermal insulation lining or thermal insulation and wear-resistant lining 920. Electric heater 921. Shield

[0130] End t1 of valve plate, end T1 of valve body

[0131] A. Valve plate inlet and outlet on sealing ring b

[0132] P1. Positioning surface of positioning angle steel 551

[0133] P2. Fixing surface of positioning angle steel 551 DETAILED DESCRIPTION

[0134] Example 1

[0135] A single plate glasses valve, such as Figure 3 and Figure 4 As shown, it includes a valve body 200, a valve plate 410 and an actuator 100; the valve body 200 includes two parallel and symmetrical square plates 211, 212, and the plates 211, 212 of the two valve bodies are respectively provided with medium inlet and outlet holes with a size similar to or the same as that of the on-site pipeline; sealing rings a311, 312 are symmetrically arranged on the inner surfaces of the two plates of the valve body, and the medium inlet and outlet holes on the two plates 211, 212 of the valve body are completely located in the circumferentially closed holes of the sealing rings a311, 312, and the axes of the holes on the sealing rings a311, 312 are coaxial with the axes of the holes on the two plates 211, 212 of the valve body;

[0136] The valve plate 410 is tightly sandwiched between the sealing rings a311 and 312 when the valve is closed;

[0137] In order to clamp the two plates 211, 212 of the valve body and the sealing rings a311, 312 therein, screw holes are evenly opened on the two plates 211, 212 of the valve body around the radial periphery of the sealing rings a311, 312, and screw fasteners such as screw nuts 511, 512 and top screws 521 are used to achieve an adjustable clamping effect;

[0138] The two plates 211, 212 and the sealing rings a311, 312 of the valve body are clamped by through-type fasteners 511 on both sides of the valve body along the direction in which the valve plate 410 enters and exits the valve body 200. The through-type fasteners 511 are screw nuts.

[0139] Corresponding to the ports of the valve plate 410 entering and exiting the valve body 200, channel steels a610 are arranged in pairs and buckled on the outer surfaces of the two plates 211, 212 of the valve body 200, and the corresponding plates 211, 212 of the valve body are pressed inward from the outer side of the bottom plate of the channel steel a610 by means of a top screw 521; both ends of the channel steel a610 protrude outside the valve body 200, and through-type fasteners 512 are arranged at both ends of each pair of channel steels a610, and the through-type fasteners 512 are screw nuts;

[0140] In order to reduce the impact of thermal expansion and contraction of on-site pipelines on the use of the valve and avoid the use of expansion joints, the valve can also be provided with a valve body external connection structure 530, which can only rely on the valve body external connection structure 530 to simultaneously solve the problem of adjustable clamping of the two plates 211, 212 of the valve body and the valve plate 410 and the sealing rings a311, 312 therein and the impact of thermal expansion and contraction of the pipeline on the use of the valve; the valve body external connection structure 530 includes a lug 531 and a through-type connection piece a;

[0141] The lugs 531 are fixedly connected to the outer walls of the two pipe nipples 230 on both sides of the valve body 200 and are symmetrically arranged relative to the two plates 211, 212 of the valve body. The two pipe nipples 230 are respectively fixedly connected to the medium inlet and outlet holes of the two plates 211, 212 of the valve body 200 and have a diameter equivalent to that of the on-site pipeline, that is, the diameter of the pipe nipples 230 is the same as or similar to that of the on-site pipeline; more than two lugs 531 on each pipe nipple 230 are evenly arranged around the pipe wall of the pipe nipples 230, and the bottom plate of the lugs 531 exceeds the side edge of the valve body 200. The through-type connector a connects and clamps the two lugs 531 symmetrically arranged on both sides of the valve body 200 in a direction parallel to the axis of the pipe nipples 230;

[0142] In order to facilitate the adjustment of the clamping force between the two plates 211, 212 of the valve body 200 and the sealing rings a311, 312 and the valve plate 410 sandwiched therein, the through-type connector a can adopt a screw-nut structure 532; the screw-nut structure 532 includes a screw that penetrates the bottom plates of the two symmetrical lugs 531 and nuts that are respectively tightened from the outside of the bottom plates of the lugs 531 to the inside, or in order to more conveniently adjust the clamping force and more effectively achieve clamping, the screw-nut structure 532 also includes an adjustable nut located inside the bottom plates of the lugs 531; when the screw-nut structure 532 is used as the through-type connector a, the above-mentioned fasteners 511, 512, top screw 521, channel steel a610, etc. can be omitted, and the screw-nut structure 532 can be used for adjustment. This simplifies the structure and solves the problem that the clamping and thermal expansion and contraction of the pipeline affect the use of the valve.

[0143] In some cases, in order to simplify the process, improve rigidity, reduce costs and ensure sealing performance, the through-type connector a can be made of profile steel or steel pipe 533, such as Fig.13 shown.

[0144] The actuator includes an electric actuator 101, an actuator fixing frame 102, a sprocket 104, a chain 103 and a long shaft 105; the fixing frame 102 is connected to the valve body 200, the long shaft 105 is connected to the output end of the actuator 101, and the four sprockets 104 are respectively fixed at the four corners in the fixing frame 102, of which two sprockets 104 are respectively fixed to the long shaft 105, and are connected to the valve plate 410 through the chain and the connecting piece b560.

[0145] The actuator 100 may use a pneumatic or hydraulic actuator in addition to the electric actuator 101 .

[0146] Example 2

[0147] A double-plate glasses valve, such as Figure 5 to Figure 7 As shown, a sealing cavity 220 is added on the basis of the single-plate eye valve described in Example 1: the two plates 211, 212 of the valve body extend along the opening direction of the valve, and a circumferentially closed sealing ring b320 is sandwiched in the extended plates 221, 222 to form a sealing cavity 220;

[0148] The sealing ring b320 is tightly attached to the sealing rings a311, 312 on one side adjacent to the valve body 200 and has an inlet and outlet A of the valve plate 220; when the valve is open, the valve plate 410 enters the sealing cavity 220 and is tightly sandwiched between the sealing rings b320, and the internal space of the sealing cavity 220 is sufficient to accommodate the opening of the valve plate 410 to be inserted therein;

[0149] Similar to the two plates 211, 212 of the valve body 200 clamping the sealing rings a311, 312, in order to ensure the sealing performance of the sealing cavity 220, the two extension plates 221, 222 of the valve body 200 are evenly provided with screw holes on the radial periphery surrounding the sealing ring b320 except for the inlet and outlet sides of the valve plate 410, and the fasteners 511 are used to achieve an adjustable clamping effect.

[0150] Example 3

[0151] For the valves described in the above-mentioned embodiments 1 to 2, in order to prevent the sealing rings a311, 312 from having excessive displacement and affecting the sealing performance of the valve, a limiting structure b is provided on the inner surfaces of the two plates 211, 212 of the valve body corresponding to the positions of the sealing rings a311, 312, and the limiting structure b is a groove 314, such as Figure 8 , 9 As shown; the sealing ring a311, 312 is embedded in the groove 314 and is higher than the groove 314, thereby avoiding the contact between the valve plate 410 or 420 and the groove 314, ensuring that the sealing ring a311, 312 fits the valve plate 410 or 420 to achieve a sealing effect.

[0152] Alternatively, the limiting structure b is an inner baffle (ring) 315 and / or an outer baffle (ring) 316, such as Fig.10 , 11As shown; along the radial direction of the sealing rings a311, 312, the inner baffle plate (ring) 315 is fixed to the inner side of the sealing rings a311, 312, and the outer baffle plate (ring) 316 is fixed to the outer side of the sealing rings a311, 312. Similarly, in order to ensure that the sealing rings a311, 312 fit closely with the valve plate to obtain a sealing effect, the height of the inner baffle plate (ring) 315 is lower than the sealing rings a311, 312; at the same time, the design of the outer baffle plate (ring) 316 aims to further improve the ability of the sealing rings a311, 312 to withstand medium pressure and prevent the displacement of the sealing rings a311, 312 and the resulting poor sealing problem. Accordingly, the height of the outer baffle plate (ring) 316 is usually lower than the sealing rings a311, 312; on the other hand, the height of the outer baffle plate (ring) 316 can also be designed to be higher than the sealing rings a311, 312 according to specific needs. Accordingly, the outer edge size of the valve plate 410 or 420 should be smaller than the inner edge size of the outer baffle plate (ring) 316, that is, the outer baffle plate (ring) 316 is not only used to limit the displacement of the sealing rings a311, 312, but also used to limit the running trajectory of the valve plates 410 and 420. Considering the convenience of replacement and maintenance of the sealing rings a311, 312, and in order to avoid the problems caused by welding deformation, the outer baffle plate (ring) 316 can usually be made of angle steel, and the angle steel used as the outer baffle plate (ring) 316 is screwed to the corresponding plates 211, 212 of the valve body by using fasteners 517 (such as screws and nuts); when the height of the angle steel is higher than the sealing rings a311, 312, the angle steel limits the displacement of the sealing rings a311, 312 while being equivalent to the guide rail of the valve plate 410 or 420, that is, the valve plate 410 or 420 is always attached to the sealing rings 311, 312, and when the valve plate 410 or 420 moves, it will not exceed the angle steel used as the outer baffle plate (ring) 316, thereby limiting the trajectory range of the valve plate 410 or 420. Fig.12 shown.

[0153] Taking into account the difference in expansion coefficients between the sealing rings a311, 312 and the inner / outer baffles (rings) 315, 316, the sealing rings usually have a small thermal expansion / contraction coefficient, while the metal used as the inner / outer baffles (rings) has a large thermal expansion / contraction coefficient. In a high temperature environment, in order to prevent the sealing rings a311, 312 from being broken or damaged due to excessive expansion difference between the two plates 211, 212 of the valve body and the inner / outer baffles (rings) 315, 316 thereon, a radial gap of no less than the expansion difference between the inner baffle (ring) 315 and the outer baffle (ring) 316 and the sealing rings a311, 312 is left.

[0154] In order to reduce the influence of the stiffness of the inner / outer baffle plate (ring) on ​​the clamping force of the adjusting sealing ring a, the inner baffle plate (ring) 315 and / or the outer baffle plate (ring) 316 are provided with a fracture or cutout (not shown in the figure) on the surface opposite to the sealing ring a311, 312, along the direction roughly perpendicular to the plate 211, 212 of the valve body.

[0155] Usually, in order to make the sealing ring bear force evenly and to facilitate replacement of the sealing ring or adjustment of its pressing force, the sealing ring a311, 312 can be configured as a square or a rectangle, such as Figure 8 , 10 As shown in 11, the sealing rings a311, 312 can be applied to circular pipes as well as square pipes or pipes of other shapes;

[0156] In order to reduce the friction when the valve plate 410 or 420 moves in and out and improve the sealing performance, the sealing rings a311, 312 are usually made of packing, polytetrafluoroethylene plate, or a composite plate composed of a polytetrafluoroethylene plate and a rubber plate; the packing includes graphite packing, ceramic packing, etc.; in specific occasions, graphite packing containing carbon fiber, graphite packing with dynamic compensation function, etc. can be used.

[0157] Furthermore, in order to improve the sealing performance and extend the service life and solve the leakage at the joint of the sealing ring, the sealing rings a311 and 312 can also be two or more sealing rings that are put together and clamped together for use. In order to compensate for the wear of the sealing ring at any time, the fastening structure on the valve body for pressing the seal, including the screw nut and the top screw, etc., is equipped with a spring (not shown in the figure) between the valve body. When two sealing rings are used, the outer diameter of one sealing ring is almost close to or equal to the inner diameter of the other sealing ring.

[0158] Similarly, for the double-plate glasses valve described in Example 2, the corresponding sealing ring b320 in the sealing cavity 220 can also adopt the same limiting structure b' as the sealing ring a, and the limiting structure b' can also adopt a groove structure, or an inner / outer baffle (ring) 315 / 316a structure, such as Fig.19 As shown;

[0159] Similarly, the sealing rings b320 and b' may also adopt similar or identical structures, designs and materials based on similar considerations as the sealing rings a311 and 312, which will not be described in detail.

[0160] Example 4

[0161] For cost saving considerations, the thickness of the valve plate 410 or 420 is appropriately reduced, but at the same time, the rigidity and strength of the valve plate 410, 420 must be ensured to be sufficient to withstand the medium pressure. Accordingly, on the basis of the above embodiment, the valve is provided with a rib plate a710.

[0162] like Figure 3 , Figure 5 As shown, a rib a710 is provided in the pipe nipple 230 at a position downstream of the valve plate 410 or 420 and close to the valve plate 410 or 420. Usually, a long strip rib a710 is adopted. A plurality of ribs a710 are provided perpendicular to the surface of the valve plate 410 or 420 and are parallel to each other. In the case of use without expansion difference, both ends of the rib a710 are fixed on the inner wall of the pipe nipple 230.

[0163] When used in pipes with insulation layer or with both insulation and wear-resistant lining and pipes, such as Fig. 20 , Fig.21 As shown, the valve body 200 and the pipe nipple 230 are also provided with a heat-insulating layer or a heat-insulating and wear-resistant lining. In this case, in order to overcome or avoid the problem of butt-locking caused by the large expansion difference between the rib plate a710 and the valve body 200 and the pipe nipple 230, the rib plate a710 is provided with a fixed end and a non-fixed end, that is, one end of the rib plate a710 is fixed in the pipe nipple 230, and the other end does not contact the inner wall of the pipe nipple 230 and there is a spacing Δs, and Δs is not less than the expansion difference between the rib plate a710 and the pipe nipple 230;

[0164] Furthermore, in order to ensure the rigidity of the rib a710 under this circumstance, a limiting structure a is provided on the inner wall of the pipe short section 230 adjacent to the non-fixed end corresponding to the position of the non-fixed end of the rib a710, and the limiting structure a adopts a limiting lug 720 structure, which includes two limiting plates 721 connected by a bottom plate 722; in terms of medium flow direction, the bottom plate 722 is fixed in the pipe short section 230 near the downstream of the rib a710, and the two limiting plates 721 are located on both sides of the non-fixed end of the rib a710, that is, the two limiting plates 721 clamp the non-fixed end of the rib a710 therebetween, and the two limiting plates 721 are parallel to the rib a710.

[0165] The rib plate a710 is provided to serve as a reinforcing structure for reducing the thickness of the valve plate to reduce costs while improving and ensuring the ability of the valve plate to withstand medium pressure.

[0166] Example 5

[0167] Based on the above embodiment, the difference from the above embodiment is that:

[0168] The valve, such as Fig. 22 As shown, the installation and positioning of the sealing rings a311, 312 on the valve body 200 are completed by the positioning structure 551;

[0169] The valve is provided with two pipe nipples 230, which are respectively fixedly connected to the medium inlet and outlet holes of the two plates 211, 212 of the valve body 200 and penetrate into the plates 211, 212 of the valve body 200; the two pipe nipples 230 have a diameter equivalent to that of the on-site pipeline;

[0170] The radial inner edges of the sealing rings a311, 312 are attached to the outer wall of the pipe nipple 230; at this time, the pipe nipple also has a limiting function for the sealing rings a311, 312.

[0171] The positioning structure adopts a positioning angle steel 551 structure, and the positioning angle steel 551 has a positioning surface P1 and a fixing surface P2, and the angle between the two surfaces is a right angle or an obtuse angle; the positioning surface P1 is against the radial outer edge of the sealing rings a311, 312 to position the sealing rings a311, 312 radially and tightly against the pipe nipple 230, and the fixing surface P2 is attached to the inner surface of the plates 211, 212 of the valve body corresponding to the sealing rings a311, 312 and is connected to the plates 211, 212 of the valve body through fasteners 517, and the fasteners 517 are generally screw nuts; the positioning angle steel 551 has no contact with the valve plate 410 or 420;

[0172] Screw holes are provided on the plates 211, 212 of the valve body at positions corresponding to the sealing rings a311, 312, and a gasket 552 is provided between the sealing rings a311, 312 and the corresponding plates 211, 212 of the valve body. When the valve plate 410 or 420 is closed, a top screw b522 is used to vertically screw into the valve body from the outer surface of the plates 211, 212 of the valve body and push the top screw b522 to press the sealing rings a311, 312 against the valve plate 410 or 420 to achieve sealing.

[0173] As in Example 1, the compression of the valve body plates 211, 212 and their corresponding sealing rings a311, 312 and the sealing after the valve plate is inserted can adopt the several fastening structures and forms listed in Example 1, and the valve body external connecting structure 530 can be further provided to strengthen or only the valve body external connecting structure 530 can be used as a fastening structure. The valve body external connecting structure 530 includes a support ear 531 and a through-type connecting piece a, which will not be repeated here.

[0174] When the through-type connection piece a of the valve body outer connection structure 530 adopts a screw nut structure 532, in some cases, the valve clamping effect can be adjusted only by the valve body outer connection structure 530 without using the above-mentioned top screw b522, pad 552 and other structures. At this time, the sealing rings a311, 312 are directly attached to the plates 211, 212 of the valve body and the valve plate 410 or 420 respectively.

[0175] On the basis of the various valves disclosed in the above embodiments, in order to obtain further technical effects, the present invention may also have the following technical solutions and technical features:

[0176] In order to prevent the sealing ring from being damaged when the valve plate is switched, and to reduce the friction of the valve plate 410 or 420 entering and exiting the valve body 200, it is more preferred that the inner surface of the hole on the valve plate 410 gradually expands from the middle to both sides along its radial direction, or the transition from the inner and outer surfaces of the valve plate to the inner surface of the hole thereon is a smooth concave without edges. For example, the inner surface of the hole of the valve plate 410 (whether it is a round hole or a square hole) can be in the shape of a sharp knife, or in the shape of a cone when viewed from the radial direction of the hole, such as Figure 14 to Figure 17 shown.

[0177] Similarly, in order to reduce damage to the sealing ring or sealing material at the corresponding position when the valve plate 420 enters and exits the valve body 200 or to reduce friction, the end t1 of the valve plate 420 entering and exiting the valve body is in a knife-edge shape (not shown in the figure).

[0178] In order to eliminate the influence of scaling on the surface of the valve plate 410 or 420 on the closing and sealing performance of the valve, it is more preferable to provide a scraper on the inner side of the two plates 211, 212 of the valve body corresponding to the end position of the valve plate 410 or 420 entering and exiting the valve body 200; when the valve plate 410 or 420 enters and exits the valve body, the scraper is in contact with the surface of the valve plate 410 or 420 (not shown in the figure).

[0179] In some use cases, after the valve is closed, condensation, scaling or crystallization will inevitably occur on the cold and hot walls of the valve plate 410 or 420. In order to avoid this phenomenon, an electric heater 920 is fixed in the pipe nipple 230 to extend into the valve body 200 for heating. Furthermore, in order to prevent dust from accumulating on the surface of the electric heater 920 and affecting its heating performance, a shield 921 is also provided in the pipe nipple 230 corresponding to the upstream adjacent position of the electric heater 920 in terms of the flow direction of the medium. Fig.18 The use of electric heating can also avoid the formation of a large amount of water in the pipeline due to the heat-sealing air and the series of hazards caused by it.

[0180] Alternatively, in order to reduce or avoid a series of problems caused by the hot and cold walls on the valve plate and reduce the energy consumption caused by the corresponding measures, the valve plate 410 or 420 is a composite valve plate with a thermal insulation interlayer, that is, the valve plate 410 or 420 is a composite structure, including two inner and outer plates 411, 412 or 421, 422, with a thermal insulation interlayer 413 or 423 sandwiched therebetween. Fig.19 shown.

[0181] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A valve, comprising a valve body, a valve plate and an actuator; characterized in that: The valve body comprises two plates which are parallel and symmetrical to each other, and medium inlet and outlet holes are correspondingly provided on the plates; Sealing rings a are symmetrically arranged on the inner surfaces of the two plates of the valve body, and the medium inlet and outlet holes on the two plates of the valve body are completely located within the circumferentially closed holes of the sealing rings a; The valve plate is tightly sandwiched between the sealing rings a when the valve is in a closed state; The fastening structure surrounds the radial periphery of the sealing ring a and is arranged on the two plates of the valve body to clamp the two plates of the valve body and / or the sealing ring a; at least a part of the fastening structure can adjust its clamping degree along a direction perpendicular to the surface of the valve body; The two plates of the valve body extend in the direction of opening the valve, and a circumferentially closed sealing ring b is sandwiched in the extended plate to form a sealed cavity; The sealing ring b is in close contact with the sealing ring a on one side adjacent to the valve body and has a valve plate inlet and outlet A; When the valve is in the open state, the valve plate is tightly sandwiched between the sealing rings b, and the internal space of the sealing cavity is sufficient to accommodate the opening of the valve plate inserted therein; The fastening structure is arranged on the outer surface of the sealing cavity to uniformly surround and clamp the extension plate of the valve body and the sealing ring b therein along the radial periphery of the sealing ring b; at least a part of the fastening structure can adjust its clamping degree along a direction perpendicular to the surface of the valve body extension section.

2. The valve according to claim 1, characterized in that: The fastening structure includes a threaded structure and / or a valve body external connection structure; The screw connection structure includes a through-type screw and nut structure, or further includes a top screw a; The through-type screw and nut structure is perpendicular to the two plate surfaces of the valve body and penetrates the two plates and is evenly installed on the periphery of the sealing ring a and at positions other than the port where the valve plate enters and exits the valve body; the top screw a is evenly and symmetrically arranged on the channel steel a, and the channel steel a is buckled in pairs on the outer surfaces of the two plates of the valve body corresponding to the ports where the valve plate enters and exits the valve body, and the top screw a presses the corresponding valve body plate inward from the outer side of the bottom plate of the channel steel a; the two ends of the channel steel a protrude outside the valve body, and through-type screw and nut are installed at the two ends of each pair of channel steels a; The valve body external connection structure includes a support ear and a through-type connection piece a; The lugs are fixedly connected to the outer walls of the two pipe nipples on both sides of the valve body and are symmetrically arranged relative to the two plates of the valve body. The two pipe nipples are respectively fixedly connected to the medium inlet and outlet holes of the two plates of the valve body and have a diameter equivalent to that of the on-site pipeline. More than two lugs are evenly arranged on each pipe nipple around the pipe wall of the pipe nipple, and the bottom plate of the lugs exceeds the side edge of the valve body. The through-type connector a connects and clamps the two lugs symmetrically arranged on both sides of the valve body in a direction parallel to the axis of the pipe nipples. The through-type connecting piece a is a screw-nut structure or a steel section or a steel pipe; the screw-nut structure includes a screw that penetrates the two symmetrical lug base plates and nuts that are respectively tightened from the outside of the lug base plates to the inside, or also includes nuts located on the inside of the lug base plates; the steel section or steel pipe penetrates the two symmetrical lug base plates to form a fixed connection.

3. The valve according to claim 1, characterized in that: Also included are pipe nipples and positioning structures; The two pipe nipples are respectively fixedly connected to the medium inlet and outlet holes of the two plates of the valve body and extend into the plates of the valve body; the pipe nipples have a diameter equivalent to that of the on-site pipes; The radial inner edge of the sealing ring a is attached to the outer wall of the pipe nipple; The positioning structure is located radially outside the sealing ring a, fixed on the inner surface of the plate of the valve body and has no contact with the valve plate; the positioning structure has a positioning surface P1, the positioning surface P1 abuts against the radial outer edge of the sealing ring a; or the positioning structure further has a fixing surface P2 connected to the positioning surface P1 at a right angle or an obtuse angle, the fixing surface P2 lies on the inner surface of the plate of the valve body corresponding to the sealing ring a and is connected to the plate of the valve body; The fastening structure includes a threaded structure and / or a valve body external connection structure; The screw connection structure includes a top screw b, or also includes a through-type screw and nut structure; The top screw b is evenly arranged corresponding to the sealing ring a, and is vertically screwed into the valve body from the outer surface of the plate of the valve body and pushes the gasket to press the sealing ring a against the valve plate, and the gasket is arranged between the inner surface of the plate of the valve body and the sealing ring a corresponding to the sealing ring a; The through-type screw and nut structure is evenly and symmetrically arranged outside the radial outer edge of the sealing ring a, connecting the plate of the valve body and the fixing surface P2 of the positioning structure; The valve body external connection structure includes a support ear and a through-type connection piece a; The lugs are symmetrically fixedly connected to the outer walls of the two pipe nipples, and at least two lugs are evenly arranged on each pipe nipple around the pipe wall of the pipe nipple. The bottom plate of the lugs exceeds the side edge of the valve body, and the through-type connector a connects and clamps the two lugs symmetrically arranged on both sides of the valve body in a direction parallel to the axis of the pipe nipple. The through-type connecting piece a is a screw-nut structure or a steel section or a steel pipe; the screw-nut structure includes a screw that penetrates the two symmetrical lug base plates and nuts that are respectively tightened from the outside of the lug base plates to the inside, or also includes nuts located on the inside of the lug base plates; the steel section or steel pipe penetrates the two symmetrical lug base plates to form a fixed connection.

4. The valve according to claim 2, characterized in that: A rib plate a is arranged in the pipeline short section at a position downstream of the valve plate, which is perpendicular to the surface of the valve plate and has at least one end fixed to the inner wall of the pipeline short section.

5. The valve according to claim 4, characterized in that: The rib a has a non-fixed end, which is not in contact with the inner wall of the pipe nipple and has a spacing Δs, and Δs is not less than the expansion difference between the rib a and the pipe nipple; Corresponding to the position of the non-fixed end of the rib plate a, a limiting structure a is provided on the inner wall of the pipe nipple adjacent to the non-fixed end, and the limiting structure a limits the displacement of the non-fixed end of the rib plate a from one side or both sides of the non-fixed end.

6. The valve according to claim 1, characterized in that: Corresponding to the sealing ring a, a limiting structure b is provided on the inner surfaces of the two plates of the valve body adjacent to the sealing ring a to limit or prevent displacement of the sealing ring a relative to the plates of the valve body; the limiting structure b has no contact with the valve plates.

7. The valve according to claim 6, characterized in that: The limiting structure b is a groove; the sealing ring a is embedded in the groove and is higher than the groove.

8. The valve according to claim 6, characterized in that: The limiting structure b includes an inner baffle plate and / or an outer baffle plate; along the radial direction of the sealing ring a, the inner baffle plate is fixed to the inner side of the sealing ring a, and the outer baffle plate is fixed to the outer side of the sealing ring a.

9. The valve according to claim 8, characterized in that: There is a gap between the inner baffle plate, the outer baffle plate and the sealing ring a in the radial direction that is not less than the expansion difference between the two.

10. The valve according to claim 8, characterized in that: The inner baffle plate and / or the outer baffle plate are provided with a break or cutout on the surface thereof opposite to the sealing ring a, along a direction substantially perpendicular to the plate of the valve body.

11. The valve according to claim 2, characterized in that: A heater is fixed in the pipeline nipple; Alternatively, a shield is further provided in the pipe nipple corresponding to the upstream adjacent position of the heater.

12. The valve according to claim 1, characterized in that: Corresponding to the sealing ring b, a limiting structure c is provided on the inner surface of the valve body extension plate to limit or prevent the displacement of the sealing ring b relative to the valve body plate; the limiting structure c has no contact with the valve plate.

13. The valve according to claim 12, characterized in that: The limiting structure c is a groove; the sealing ring b is embedded in the groove and is higher than the groove.

14. The valve according to claim 12, characterized in that: The limiting structure c includes an inner baffle and / or an outer baffle; along the radial direction of the sealing ring b, the inner baffle is fixed to the inner side of the sealing ring b, and the outer baffle is fixed to the outer side of the sealing ring b; There is a gap between the inner baffle plate, the outer baffle plate and the sealing ring b in the radial direction that is not less than the expansion difference between the two.

Images