Valve with double valve plates

Abstract

The utility model relates to the technical field of chemical pipelines and valves, in particular to a double-valve-plate valve. The first valve rod is movably connected to the valve body so that the first valve rod can move relative to the valve body in the direction perpendicular to the valve channel. The first valve plate is connected with the first valve rod so as to move along with the first valve rod and cut off the valve channel. The second valve rod is movably connected to the valve body so that the second valve rod can move relative to the valve body in the direction perpendicular to the valve channel. The second valve plate is connected with the second valve rod so as to move along with the second valve rod and cut off the valve channel, a double-valve-plate structure is arranged, the valve leakage phenomenon can be reduced, and a series of safety problems caused by valve leakage can be effectively relieved to a certain extent.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical pipelines and valves, in particular to a double-valve plate valve. Background Art

[0002] A large number of valves are used in chemical plants, but many valves in key positions may not be closed tightly, which leaves many safety hazards for the operations behind the valves. Many chemical accidents are caused by this. The current practice is generally to install a blind plate behind the valve after the valve is closed. However, when installing and removing the blind plate, if the material contains toxic media or flammable and explosive materials, it often brings great difficulties to the operators. Utility Model Content

[0003] In view of the defects of the prior art, the utility model provides a double valve plate valve, which is provided with a double valve plate structure, can reduce valve leakage, and to a certain extent can effectively alleviate a series of safety problems caused by valve leakage.

[0004] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is a double valve plate valve, which includes a valve body, a first valve stem, a first valve plate, a second valve stem, and a second valve plate; the valve body has a valve channel; the first valve stem is movably connected to the valve body so that the first valve stem moves relative to the valve body in a direction perpendicular to the valve channel; the first valve plate is connected to the first valve stem to move with the first valve stem and cut off the valve channel; the second valve stem is movably connected to the valve body so that the second valve stem moves relative to the valve body in a direction perpendicular to the valve channel; the second valve plate is connected to the second valve stem to move with the second valve stem and cut off the valve channel.

[0005] Furthermore, the valve body is provided with a sewage outlet, and the sewage outlet is communicated with the valve channel between the first valve plate and the second valve plate.

[0006] Furthermore, the valve body is provided with an air filling port, and the air filling port is connected to the valve channel between the first valve plate and the second valve plate.

[0007] Furthermore, the inflation port is externally connected to a nitrogen pipeline.

[0008] Furthermore, the diameter of the sewage outlet is larger than the diameter of the inflation port.

[0009] Furthermore, the second valve plate is arranged downstream of the valve channel, and a accommodating groove is circumferentially provided on the side wall of the second valve plate. The valve body is provided with a grease injection port, and the grease injection port is connected to the accommodating groove to provide a channel for the lipid medium to be filled into the accommodating groove, and to provide a pre-tightening force for the sealing surface of the second valve plate and to seal the leakage points of the sealing surface of the second valve plate.

[0010] Furthermore, the accommodating groove comprises a U-shaped accommodating groove.

[0011] Furthermore, the grease injection port is externally connected to a grease injection pipeline, the grease injection pipeline is connected to an injection device, and the grease injection pipeline is provided with an isolation valve.

[0012] Furthermore, a plurality of grease injection ports are provided.

[0013] The beneficial effects of the utility model are as follows: a first valve plate and a second valve plate are provided, and a cavity is formed between the two valve plates after they are closed. When both valve plates have no internal leakage, it is the best working state; when only one of the two valve plates has an internal leakage, zero leakage can also be achieved. In this way, valve leakage can be reduced, and a series of safety problems caused by valve leakage can be effectively alleviated to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural schematic diagram of a double valve plate valve in one embodiment of the utility model;

[0015] In the figure:

[0016] 100, valve body, 110, valve channel, 120, sewage outlet, 130, air filling port, 140, grease injection port,

[0017] 200, first valve stem,

[0018] 300, first valve plate,

[0019] 400, second valve stem,

[0020] 500. A second valve plate. 510. A receiving groove. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0022] See also Figure 1, shows a double valve plate valve in an embodiment of the utility model, which includes a valve body 100, a first valve stem 200, a first valve plate 300, a second valve stem 400 and a second valve plate 500; the valve body 100 has a valve channel 110; the first valve stem 200 is movably connected to the valve body 100, so that the first valve stem 200 moves relative to the valve body 100 in a direction perpendicular to the valve channel; the first valve plate 300 is connected to the first valve stem 200, so as to move with the first valve stem 200 and cut off the valve channel 110; the second valve stem 400 is movably connected to the valve body 100, so that the second valve stem 400 moves relative to the valve body 100 in a direction perpendicular to the valve channel 110; the second valve plate 500 is connected to the second valve stem 400, so as to move with the second valve stem 400 and cut off the valve channel 110.

[0023] The above-mentioned double valve plate valve is provided with a first valve plate 300 and a second valve plate 500. A cavity is formed between the two valve plates after they are closed. When both valve plates have no internal leakage, it is the best working state; when only one of the two valve plates has internal leakage, zero leakage can also be achieved. In this way, valve leakage can be reduced, and a series of safety issues caused by valve leakage can be effectively alleviated to a certain extent. It should be noted that the connection method between the first valve stem 200 and the valve body 100 includes but is not limited to threaded connection. In addition to the threaded connection, a sliding bearing can also be provided to achieve relative movement between the two. The connection method between the second valve stem 400 and the valve body 100 is similar. In addition, it is necessary to provide a reasonable sealing structure between the first valve stem 200 and the valve body 100, and between the second valve stem 400 and the valve body 100, including but not limited to the provision of sealing packing.

[0024] In one embodiment, the valve body 100 is provided with a drain port 120 , and the drain port 120 is connected to the valve channel 110 between the first valve plate 300 and the second valve plate 500 .

[0025] In one embodiment, the valve body 100 is provided with an air filling port 130, which is connected to the valve channel 110 between the first valve plate 300 and the second valve plate 500. It should be noted that the air filling port 130 is used for cleaning when the sewage outlet 120 is blocked, and is generally not used; in addition, a pressure gauge or a vacuum gauge can be installed behind the isolation valve to assist in judging the leakage in the cavity.

[0026] In one embodiment, the gas charging port 130 is externally connected to a nitrogen pipeline.

[0027] In one embodiment, the diameter of the sewage outlet 120 is greater than the diameter of the inflation port.

[0028] In one embodiment, the second valve plate 500 is arranged downstream of the valve channel 110, and a receiving groove 510 is circumferentially opened on the side wall of the second valve plate 500. The valve body 100 is provided with a grease injection port 140, and the grease injection port 140 is connected to the receiving groove 510 to provide a channel for the lipid medium to be filled into the receiving groove 510, and to provide a pre-tightening force for the sealing surface of the second valve plate 500 and to seal the leakage points of the sealing surface of the second valve plate 500.

[0029] In one embodiment, the accommodating groove 510 includes a U-shaped accommodating groove. Such a configuration can increase the accommodating space of the accommodating groove 510 to a certain extent, so as to store more lipid medium, thereby achieving a better effect of providing pre-tightening force and plugging leaks. The U-shaped accommodating groove can be slightly deeper than the depth of a general valve plate to correspond to the grease injection port 140 opened in the valve body 100, so as to facilitate the injection of lipid substances when there is internal leakage in the second valve plate 500. The specific situation should consider the mutual influence of process media.

[0030] In one embodiment, the grease injection port 140 is externally connected to a grease injection pipeline, the grease injection pipeline is connected to an injection device, and an isolation valve is provided on the grease injection pipeline. When injection is required, the injection device (such as a grease gun) is first connected, then the isolation valve is opened, and then the injection device is started; when the pressure is reached, the isolation valve is first closed and then the injection device is disconnected.

[0031] In one embodiment, a plurality of grease injection ports 140 are provided. Specifically, the grease injection ports 140 can be evenly arranged around the valve body 100, and each grease injection port 140 is connected to a grease injection pipeline to speed up the injection rate of the lipid medium, which is beneficial to shorten the valve leakage time.

[0032] The above-mentioned double valve plate valve is provided with a first valve plate 300 and a second valve plate 500. A cavity is formed between the two valve plates after they are closed. When both valve plates have no internal leakage, it is the best working state. When only one of the two valve plates has internal leakage, zero leakage can be achieved. When both valve plates have internal leakage, as long as the sewage outlet 120 is opened and the inflation port 130 is closed at the same time, the fluid can basically prevent leakage downstream of the second valve plate 500. If there is still material leakage downstream, at this time, as long as a grease gun is used to inject lipid substances into the grease injection port 140, the sealing surface preload of the second valve plate 500 is increased while filling the defective leakage points of the sealing surface, the material leakage downstream can be cut off. The above-mentioned double valve plate valve can achieve multiple blocking to further reduce valve leakage.

[0033] It should be noted that the valve is manufactured in the factory and can be installed on site. Note that the front and rear directions of the first valve plate 300 and the second valve plate 500 cannot be reversed. After the valve is installed, the corresponding accessories and related process pipelines must be connected. After normal commissioning, the upstream valve plate is used as a cut-off first, and the downstream valve plate is in an open state and is not used; when the upstream valve plate has internal leakage, the downstream valve plate is activated for cutting, and the upstream valve plate can be used at this time; when both valve plates have internal leakage, the two valve plates can be closed at the same time, and the drainage is coordinated through the inflation port 130 and the sewage outlet 120, which can basically achieve zero leakage; if the material still cannot be cut off, finally activate the grease injection port 140 for sealing. When the injection of lipid materials still cannot be cut off, consider using a blind plate to cut off, and the leakage at this time should be very small.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

Claims

1. A double valve plate valve, characterized in that: include a valve body having a valve passage; a first valve stem movably connected to the valve body so that the first valve stem moves relative to the valve body in a direction perpendicular to the valve passage; a first valve plate connected to the first valve stem so as to move with the first valve stem and cut off the valve channel; a second valve stem movably connected to the valve body so that the second valve stem moves relative to the valve body in a direction perpendicular to the valve passage; and The second valve plate is connected to the second valve stem so as to move with the second valve stem and cut off the valve channel.

2. A double valve plate valve according to claim 1, characterized in that: The valve body is provided with a sewage outlet, and the sewage outlet is communicated with the valve channel between the first valve plate and the second valve plate.

3. A double valve plate valve according to claim 2, characterized in that: The valve body is provided with an air filling port, and the air filling port is connected to the valve channel between the first valve plate and the second valve plate.

4. A double valve plate valve according to claim 3, characterized in that: The inflation port is externally connected with a nitrogen pipeline.

5. The double valve plate valve according to claim 3, characterized in that: The diameter of the sewage outlet is greater than the diameter of the inflation port.

6. The double valve plate valve according to claim 1, characterized in that: The second valve plate is arranged downstream of the valve channel, and a accommodating groove is circumferentially provided on the side wall of the second valve plate. The valve body is provided with a grease injection port, and the grease injection port is connected to the accommodating groove to provide a channel for the lipid medium to be filled into the accommodating groove, provide a pre-tightening force for the sealing surface of the second valve plate, and seal the leakage points of the sealing surface of the second valve plate.

7. A double valve plate valve according to claim 6, characterized in that: The containing groove comprises a U-shaped containing groove.

8. The double valve plate valve according to claim 6, characterized in that: The grease injection port is externally connected to a grease injection pipeline, the grease injection pipeline is connected to an injection device, and the grease injection pipeline is provided with an isolation valve.

9. The double valve plate valve according to claim 6, characterized in that: The grease injection port is provided in plurality.

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