Valve capable of overhauling and replacing sealing and driving parts on line

Abstract

The utility model discloses a valve capable of overhauling and replacing sealing and driving parts on line. Operation cavities are formed in a mounting base, a valve plate body is connected with a valve plate driving mechanism, a valve body is connected to the lower portion of the mounting base, and a valve plate inlet and outlet is formed in the upper portion of the valve body and communicated with the operation cavities. The valve plate driving mechanism drives the valve plate body to enter and exit from the valve body through the valve plate inlet and outlet, so that the valve has an open state and a closed state, in the open state of the valve, the first sealing piece and the second sealing piece are located in the operation cavity, and a sealing interface is formed between the lower portion of the valve plate body and the third sealing piece; when the valve is in a closed state, a sealing interface is formed at the contact position of the first sealing piece and the valve plate body. A sealing interface is formed between the upper part of the valve plate body and the third sealing piece; a sealing interface is formed at the contact position of the second sealing piece and the valve plate body. The problems that a traditional valve is high in operation and maintenance cost, sealing and driving components cannot be overhauled and replaced online, and normal operation of the valve is affected are solved.

Description

Technical Field

[0001] The utility model relates to a valve capable of online repair and replacement of sealing and driving components, belonging to the technical field of valves. Background Art

[0002] At present, if traditional valves need to be repaired or the sealing device of the flow surface needs to be replaced, it must be done under the premise of the medium in the valve cavity.

[0003] Therefore, in the existing pipe network design, maintenance valves must be installed before and after the valves that need maintenance, or other measures must be taken to drain the medium in the valve cavity that needs maintenance, and ensure that there is no medium in the valve body during the maintenance period. This not only increases the cost of equipment investment, civil engineering investment, system control machine operation and maintenance, but also easily causes pipeline head loss, potential sealing leakage points and pipeline manufacturing costs, affecting the normal operation of the valve. It is necessary to develop a valve that can be used for online maintenance and replacement of sealing and driving components. Utility Model Content

[0004] The utility model aims to provide a valve capable of online repair and replacement of sealing and driving components, so as to solve the problems that traditional valves have high operation and maintenance costs and cannot be repaired and replaced online, thus affecting the normal operation of the valve.

[0005] The utility model solves the above technical problems with the following technical solutions: A valve capable of online repair and replacement of sealing and driving components, comprising a mounting seat, a valve plate driving mechanism, a valve plate body, a valve body, a first sealing member, a second sealing member and a third sealing member;

[0006] An operating cavity is formed inside the mounting seat, the valve plate driving mechanism is fixed to the upper end of the mounting seat, the valve plate body is connected to the valve plate driving mechanism, the valve body is connected to the lower part of the mounting seat, a valve plate inlet and outlet are formed on the upper part of the valve body, and the valve plate inlet and outlet are connected between the operating cavities;

[0007] The first sealing member is connected to the left side of the valve plate body, and the second sealing member is connected to the right side of the valve plate body; the third sealing member is arranged at the inlet and outlet of the valve plate;

[0008] The valve plate driving mechanism drives the valve plate body to enter and exit the valve body through the valve plate inlet and outlet, so that the valve has an open state and a closed state.

[0009] When the valve is in an open state, the first sealing member and the second sealing member are in the operating cavity, and a sealing interface is formed between the lower portion of the valve plate body and the third sealing member;

[0010] When the valve is in a closed state, a sealing interface is formed at the contact position between the first sealing member and the valve body; a sealing interface is formed between the upper part of the valve plate body and the third sealing member; and a sealing interface is formed at the contact position between the second sealing member and the valve body.

[0011] As a preferred solution for a valve capable of online repair and replacement of sealing and driving components, one end of the valve body is connected to a first flange, and the other end of the valve body is connected to a second flange.

[0012] As a preferred solution for a valve capable of online repair and replacement of sealing and driving components, a sealing notch is formed at the bottom of the valve body, and when the valve is closed, the valve plate body is placed inside the sealing notch.

[0013] As a preferred solution for a valve capable of online repair and replacement of sealing and driving components, the valve plate driving mechanism adopts a hydraulic driving device or a pneumatic driving device.

[0014] As a preferred solution for valves capable of online repair and replacement of sealing and driving components, the valve plate driving mechanism adopts an electric motor device.

[0015] As a preferred solution for valves capable of online repair and replacement of sealing and driving components, the valve plate driving mechanism adopts a driving hand wheel.

[0016] The utility model also provides a valve capable of online repair and replacement of sealing and driving components, comprising a mounting seat, a valve plate driving mechanism, a valve plate body, a valve body, a first sealing member, a second sealing member, a repair valve body, a repair valve plate and a third sealing member;

[0017] An operating cavity is formed inside the mounting seat, the valve plate driving mechanism is fixed to the upper end of the mounting seat, the valve plate body is connected to the valve plate driving mechanism, the valve body is connected to the lower part of the mounting seat, a valve plate inlet and outlet are formed on the upper part of the valve body, and the valve plate inlet and outlet are connected between the operating cavities;

[0018] The first sealing member is connected to the left side of the valve plate body, and the second sealing member is connected to the right side of the valve plate body; the inspection valve body is connected to the side of the mounting seat, and the inspection valve plate is connected to the inspection valve body; the third sealing member is connected to the bottom of the inspection valve plate;

[0019] The valve plate driving mechanism drives the valve plate body to enter and exit the valve body through the valve plate inlet and outlet, so that the valve has an open state, a closed state and an inspection state.

[0020] When the valve is in an open state, the first sealing member and the second sealing member are located in the operating cavity, and the inspection valve plate is located inside the inspection valve body;

[0021] When the valve is in a closed state, a sealing interface is formed at a contact position between the first sealing member and the valve body; a sealing interface is formed at a contact position between the second sealing member and the valve body, and the inspection valve plate is located inside the inspection valve body;

[0022] In the valve maintenance state, the first sealing member and the second sealing member are located in the operating cavity, and a sealing interface is formed between the third sealing member at the bottom of the maintenance valve plate and the inner wall of the operating cavity.

[0023] As a preferred solution for a valve capable of online repair and replacement of sealing and driving components, a sealing notch is formed at the bottom of the valve body, and when the valve is closed, the valve plate body is placed inside the sealing notch;

[0024] The top of the mounting seat is connected to an air valve; the side of the mounting seat is connected to a drain valve;

[0025] The drain valve is located above the inspection valve body.

[0026] As a preferred solution for valves capable of online repair and replacement of sealing and driving components, the valve plate driving mechanism adopts one of a hydraulic driving device, a pneumatic driving device, a motor device and a driving hand wheel.

[0027] As a preferred solution for valves capable of online repair and replacement of sealing and driving components, the repair valve plate is connected to a repair driving mechanism, and the repair driving mechanism adopts one of a hydraulic driving device, a pneumatic driving device, a motor device and a driving hand wheel;

[0028] The exterior of the inspection valve plate is also connected to a fourth sealing member, and in the valve inspection state, a sealing interface is formed between the fourth sealing member and the mounting seat.

[0029] The beneficial effects of the present invention are that the maintenance, inspection and replacement of equipment such as valve seals and drive components can be achieved very conveniently outside the pipe; there is no need to add special inspection valves, the pipe network design layout is effectively simplified, and the pipeline design and production is simpler; the inspection valve can be eliminated, thereby saving the direct investment cost of the equipment. Because many pipe networks are buried underground, it is necessary to build valve wells for installing valves. Since the present invention eliminates the inspection valves, the number of valve wells will naturally be reduced, saving the civil engineering investment cost; the workload of inspection, maintenance and replacement is greatly reduced, the work difficulty is reduced, and the maintenance and inspection costs are naturally reduced, because the inspection does not affect the normal operation of the pipe network, and no special operation control process is added, which naturally saves the operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0031] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0032] Figure 1 A schematic diagram of the structure of a valve in an open state that can perform online repair and replacement of sealing and driving components provided in Example 1 of the utility model;

[0033] Figure 2 A schematic diagram of the closed state structure of a valve capable of online repair and replacement of sealing and driving components provided in Example 1 of the utility model;

[0034] Figure 3 A schematic diagram of the structure of a valve in an open state that can perform online repair and replacement of sealing and driving components provided in Example 2 of the utility model;

[0035] Figure 4 A schematic diagram of the closed state structure of a valve capable of online repair and replacement of sealing and driving components provided in Example 2 of the utility model;

[0036] Figure 5 A schematic diagram of the structure of a valve in an open state that can perform online repair and replacement of sealing and driving components provided in Example 3 of the utility model;

[0037] Figure 6 A schematic diagram of the closed state structure of a valve capable of online repair and replacement of sealing and driving components provided in Example 3 of the utility model;

[0038] Figure 7 A schematic diagram of the structure of a valve in an open state that can perform online repair and replacement of sealing and driving components provided in Example 4 of the utility model;

[0039] Figure 8 A schematic diagram of the structure of a valve in a closed state that can perform online repair and replacement of sealing and driving components provided in Example 4 of the utility model;

[0040] Fig. 9A schematic diagram of the structure of a valve in an open state that can perform online repair and replacement of sealing and driving components provided in Example 5 of the utility model;

[0041] Fig.10 A schematic diagram of the structure of a valve in a closed state that can perform online repair and replacement of sealing and driving components provided in Example 5 of the utility model;

[0042] Fig.11 A schematic diagram of the structure of a valve in an open state that can perform online repair and replacement of sealing and driving components provided in Example 6 of the utility model;

[0043] Fig.12 This is a schematic diagram of the closed state structure of the valve that can be used for online maintenance and replacement of sealing and driving components provided in Example 6 of the utility model.

[0044] In the figure, 1. mounting seat; 2. valve plate driving mechanism; 3. valve plate body; 4. valve body; 5. first sealing member; 6. second sealing member; 7. third sealing member; 8. operating cavity; 9. valve plate inlet and outlet; 10. first flange; 11. second flange; 12. sealing groove; 13. maintenance valve body; 14. maintenance valve plate; 15. air valve; 16. drain valve; 17. maintenance driving mechanism; 18. fourth sealing member. DETAILED DESCRIPTION

[0045] 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.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0047] Example 1

[0048] See also Figure 1 and Figure 2 , Embodiment 1 of the utility model provides a valve capable of online repair and replacement of sealing and driving components, comprising a mounting seat 1, a valve plate driving mechanism 2, a valve plate body 3, a valve body 4, a first sealing member 5, a second sealing member 6 and a third sealing member 7;

[0049] The mounting seat 1 has an operating cavity 8 formed inside, the valve plate driving mechanism 2 is fixed to the upper end of the mounting seat 1, the valve plate body 3 is connected to the valve plate driving mechanism 2, the valve body 4 is connected to the lower part of the mounting seat 1, and a valve plate inlet and outlet 9 is formed on the upper part of the valve body 4, and the valve plate inlet and outlet 9 communicates with the operating cavity 8;

[0050] The first sealing member 5 is connected to the left side of the valve plate body 3, and the second sealing member 6 is connected to the right side of the valve plate body 3; the third sealing member 7 is arranged at the valve plate inlet and outlet 9;

[0051] The valve plate driving mechanism 2 drives the valve plate body 3 to enter and exit the valve body 4 through the valve plate inlet and outlet 9, so that the valve has an open state and a closed state:

[0052] When the valve is in the open state, the first sealing member 5 and the second sealing member 6 are in the operating cavity 8, and a sealing interface is formed between the lower part of the valve plate body 3 and the third sealing member 7;

[0053] When the valve is closed, a sealing interface is formed at the contact position between the first sealing member 5 and the valve body 4; a sealing interface is formed between the upper part of the valve plate body 3 and the third sealing member 7; and a sealing interface is formed at the contact position between the second sealing member 6 and the valve body 4.

[0054] In this embodiment, a sealing notch 12 is formed at the bottom of the valve body 4. When the valve is closed, the valve plate body 3 is placed inside the sealing notch 12, which can improve the sealing effect.

[0055] In this embodiment, one end of the valve body 4 is connected to a first flange 10, and the other end of the valve body 4 is connected to a second flange 11. The first flange 10 and the second flange 11 are used to realize flange connection between the valve and other equipment, and flanges may not be provided, and the valve may be connected to other equipment by welding.

[0056] In this embodiment, since the valve realizes the opening and closing functions by the valve body plate entering and exiting the pipeline in a direction perpendicular to the center of the pipeline of the valve body 4, a valve plate inlet and outlet 9 is opened on one side of the valve body 4 in a direction perpendicular to the center of the pipeline. In order to prevent the pipeline medium from flowing out of the pipeline from this gap, a third sealing member 7 is provided here. The third sealing member 7 is in close contact with the valve plate body 3 during the entire process of valve opening and closing.

[0057] In this embodiment, the valve plate driving mechanism 2 adopts a hydraulic driving device or a pneumatic driving device. The pneumatic driving device is mainly composed of a cylinder and a matching valve pipeline, and the expansion and contraction of the cylinder drives the valve plate body 3 to move up and down, thereby realizing the opening and closing of the valve. The hydraulic driving device is mainly composed of a hydraulic rod and a matching valve pipeline, and the expansion and contraction of the hydraulic rod drives the valve plate body 3 to move up and down, thereby realizing the opening and closing of the valve.

[0058] The working principle of the valve capable of online repair and replacement of sealing and driving components provided in Example 1 of the utility model is as follows:

[0059] The valve is provided with a valve plate body 3 for cutting off the flow of the medium in the pipe. The valve is switched by driving the valve plate body 3 to move up and down in the valve body 4 through the valve plate driving mechanism 2, thereby cutting off or connecting the medium in the pipe. The valve plate body 3 is provided with a first seal 5 and a second seal 6. When the valve is fully closed, the valve plate body 3 divides the inner cavity of the valve body 4 into two independent spaces. A sealing interface is formed between the first seal 5 and the inner wall of the contact position of the valve body 4; a sealing interface is formed between the upper part of the valve plate body 3 and the third seal 7; and a sealing interface is formed between the contact position of the second seal 6 and the valve body 4, thereby effectively preventing the medium in the independent space at the front end of the sealing structure in the pipeline from flowing to other spaces through the gap formed by the end face of the valve body 4 opening and the valve plate body 3, that is, preventing the medium from flowing in the valve body 4 and flowing from the valve body 4 opening to the outside of the pipe.

[0060] Among them, the inlet and outlet of the valve body 4 is provided with a third sealing member 7, which is in close contact with the valve plate body 3 during the process of opening and closing the valve and switching to form a closed sealing surface, which can independently prevent the pipeline medium flowing into the valve body 4 from flowing from the valve plate inlet and outlet 9 on the valve body 4 to the outside of the valve body 4. When the valve is fully closed, because the first sealing member 5 and the second sealing member 6 on the valve plate body 3 and the inner cavity of the valve body 4 work together, it can prevent the pipeline medium flowing into the valve body 4 from flowing from the valve plate inlet and outlet 9 on the valve body 4 to the outside of the valve body 4. Therefore, the valve plate inlet and outlet 9 on the valve body 4 is provided with a closed sealing surface formed by the close contact between the third sealing member 7 and the valve plate body 3, as a second sealing measure to prevent the pipeline medium flowing into the valve body 4 from flowing to the outside of the valve body 4 and causing leakage of the valve body 4.

[0061] When the valve is fully open and during the switching process, the first seal 5 and the second seal 6 on the valve plate body 3 do not have a sealing effect. At this time, the third seal 7 disposed at the valve plate inlet and outlet 9 is in close contact with the valve plate body 3 to form a sealing surface, which serves as the only sealing measure to prevent the pipeline medium flowing into the valve body 4 from flowing to the outside of the valve body 4 and causing leakage of the valve body 4. It is also a working sealing measure. Due to this sealing measure, when the first seal 5 and the second seal 6 on the valve plate body 3 have problems, the valve is fully open. At this time, the first seal 5 and the second seal 6 are on the outside of the valve body 4, and their sealing devices do not work. The first seal 5 and the second seal 6 can be inspected and replaced on the outside of the valve body 4. If there is a problem with the valve plate drive mechanism 2, it can also be inspected and replaced at this time.

[0062] If there is a problem with the third sealing member 7 at the valve plate inlet and outlet 9 on the valve body 4, the valve can be fully closed. At this time, the closed sealing surface formed by the contact surface between the first sealing member 5 and the second sealing member 6 on the valve plate body 3 and the inner cavity of the valve body 4 can prevent the pipeline medium flowing into the valve body 4 from flowing to the outside of the valve body 4 and causing the valve body 4 to leak. At this time, the third sealing member 7 at the valve plate inlet and outlet 9 on the valve body 13 can be inspected. Because the third sealing member 7 is on the outside of the valve body 4, it is very convenient to inspect and replace.

[0063] The utility model does not need to set up a maintenance valve, and during the maintenance period, it is not necessary to take other operation control measures to empty the flow medium in the pipelines before and after the valve body 4, so it is very convenient to realize online maintenance of the valve, replacement of the sealing device or the driving device, etc. This function is mainly achieved through the following design:

[0064] First, the movement of the valve plate during switching is similar to that of a traditional plug-in valve, and the switching of the valve is also achieved by pushing out and inserting the valve plate body 3 to control the flow of the medium in the valve body 4. However, the sealing device is not arranged in the inner cavity of the valve body 4, but is divided into two parts, one part is at the valve plate inlet and outlet 9 on the outside of the valve body 4, and the other part is on the valve plate body 3. This creates a physical space for the sealing device to be inspected and replaced outside the valve body 4.

[0065] Second, the mutual cooperation relationship between the valve plate body 3 of the utility model and the third sealing member 7 at the valve plate inlet and outlet 9 on the outer side of the valve body 4 is limited. The valve plate body 3 must be in close contact with the third sealing member 7 at the valve plate inlet and outlet 9 on the outer side of the valve body 4 to form an effective sealing surface during the process of opening and closing the valve and switching. Otherwise, leakage may occur during the operation of the valve. During the opening of the valve, the first sealing member 5 and the second sealing member 6 on the valve plate body 3 are partially or completely out of contact with the inner cavity of the valve body 4, or the sealing device on the valve plate is damaged when the valve is fully closed. At this time, the sealing device does not have a sealing effect. There is a flowing medium in the valve body 4. If the water level in the pipe is higher than the valve plate inlet and outlet 9 on the valve body 4, the closed sealing surface formed by the close contact between the third sealing member 7 arranged at the valve plate inlet and outlet 9 on the outer side of the valve body 4 and the valve plate body 3 is prevented from flowing to the outside of the valve body 4.

[0066] Third, the positional relationship between the first seal 5, the second seal 6 on the valve plate body 3 and the third seal 7 at the valve plate inlet and outlet 9 on the outer side of the valve body 4 is limited. When the valve is fully closed, the first seal 5, the second seal 6 on the valve plate body 3 should be below the third seal 7 at the valve plate inlet and outlet 9 and on the inner cavity side of the valve body 4. At this time, there is no flowing medium in the valve body 4, and the medium is prevented from flowing to the downstream and surrounding areas of the valve plate body 3 by the valve plate body 3 and the inner cavity of the valve body 4, as well as the first seal 5, the second seal 6 on the valve plate body 3 and the inner cavity wall of the valve body 4. At this time, the outer side of the valve plate outlet of the valve body 4 is inspected and replaced outside the valve body 4. The third sealing member 7 at the inlet 9 will not cause leakage of the medium in the valve body 4; when the valve is fully opened, the first sealing member 5 and the second sealing member 6 on the valve plate body 3 should be above the third sealing member 7 at the valve plate inlet and outlet 9 and on the outside of the valve body 4. When the valve is fully opened, although there is medium flowing in the valve body 4, the third sealing member 7 at the valve plate inlet and outlet 9 is in close contact with the valve plate body 3 to form a closed sealing surface, which can prevent the flowing medium flowing through the valve body 4 from flowing to the outside of the valve body 4 through the valve plate inlet and outlet 9. At this time, the first sealing member 5, the second sealing member 6 and the valve plate driving mechanism 2 on the valve plate body 3 can be inspected and replaced on the outside of the valve body 4.

[0067] Fourthly, due to the common factors of the above three items, the valve can be easily inspected online, and the sealing device or driving device can be replaced without installing a maintenance valve and taking other control measures to drain the flowing medium in the pipelines before and after the valve body 4 during the maintenance period.

[0068] Example 2

[0069] See also Figure 3 and Figure 4 , Embodiment 2 of the present utility model provides a valve that can be repaired and replaced online for sealing and driving components. The valve plate driving mechanism 2 adopts a motor device, which is mainly composed of a reduction motor and a screw rod, and converts electrical energy into a screw rod for linear or rotational motion, thereby driving the valve plate body 3 to move up and down linearly to realize the opening and closing of the valve. Other structures and principles are the same as those of Embodiment 1, and will not be repeated here.

[0070] Example 3

[0071] See also Figure 5 and Figure 6, Embodiment 3 of the utility model provides a valve that can be repaired and replaced online for sealing and driving components. The valve plate driving mechanism 2 adopts a driving hand wheel, which is mainly composed of a screw rod and a rotating wheel. The screw rod is rotated by manpower to make a linear or rotary motion. If the screw rod is in a linear motion, the screw rod drives the valve plate body 3 to move up and down, thereby realizing the opening and closing of the valve. This is called a rising stem valve; if the screw rod is in a rotary motion, the valve plate is driven by a nut matched with the screw rod to move up and down linearly, thereby realizing the opening and closing of the valve. This is called a concealed stem valve. Other structures and principles are the same as those in Embodiment 1, and will not be repeated here.

[0072] Example 4

[0073] See also Figure 7 and Figure 8 , Embodiment 4 of the utility model provides a valve capable of online repair and replacement of sealing and driving components, comprising a mounting seat 1, a valve plate driving mechanism 2, a valve plate body 3, a valve body 4, a first sealing member 5, a second sealing member 6, a repair valve body 13, a repair valve plate 14 and a third sealing member 7;

[0074] The mounting seat 1 has an operating cavity 8 formed inside, the valve plate driving mechanism 2 is fixed to the upper end of the mounting seat 1, the valve plate body 3 is connected to the valve plate driving mechanism 2, the valve body 4 is connected to the lower part of the mounting seat 1, and a valve plate inlet and outlet 9 is formed on the upper part of the valve body 4, and the valve plate inlet and outlet 9 communicates with the operating cavity 8;

[0075] Among them, the first sealing member 5 is connected to the left side of the valve plate body 3, and the second sealing member 6 is connected to the right side of the valve plate body 3; the inspection valve body 13 is connected to the side of the mounting seat 1, and the inspection valve plate 14 is connected to the inspection valve body 13; the third sealing member 7 is connected to the bottom of the inspection valve plate 14;

[0076] The valve plate driving mechanism 2 drives the valve plate body 3 to enter and exit the valve body 4 through the valve plate inlet and outlet 9, so that the valve has an open state, a closed state and an inspection state:

[0077] When the valve is in the open state, the first sealing member 5 and the second sealing member 6 are in the operating cavity 8, and the inspection valve plate 14 is in the interior of the inspection valve body 13;

[0078] When the valve is closed, a sealing interface is formed at the contact position between the first sealing member 5 and the valve body 4; a sealing interface is formed at the contact position between the second sealing member 6 and the valve body 4, and the inspection valve plate 14 is located inside the inspection valve body 13;

[0079] In the valve maintenance state, the first sealing member 5 and the second sealing member 6 are in the operating cavity 8 , and a sealing interface is formed between the third sealing member 7 at the bottom of the maintenance valve plate 14 and the inner wall of the operating cavity 8 .

[0080] In this embodiment, a sealing notch 12 is formed at the bottom of the valve body 4. When the valve is closed, the valve plate body 3 is placed inside the sealing notch 12, which can improve the sealing effect.

[0081] In this embodiment, the top of the mounting seat 1 is connected to an air valve 15; the side of the mounting seat 1 is connected to a drain valve 16; the drain valve 16 is located above the inspection valve body 13; the valve plate drive mechanism 2 adopts a hydraulic drive device. The inspection valve plate 14 is connected to an inspection drive mechanism 17, which adopts one of a hydraulic drive device, a pneumatic drive device, a motor device and a driving hand wheel; the outside of the inspection valve plate 14 is also connected to a fourth sealing member 18, and in the valve inspection state, a sealing interface is formed between the fourth sealing member 18 and the mounting seat 1.

[0082] The working principle of the valve capable of online repair and replacement of sealing and driving components provided in Example 4 of the utility model is as follows:

[0083] The valve is provided with a valve plate body 3 for cutting off the flow of the medium in the pipe, and the valve plate body 3 is provided with a first sealing member 5 and a second sealing member 6. The valve is switched by the valve plate driving mechanism 2 driving the valve plate body 3 to move up and down in the inner cavity of the valve body 4, thereby realizing the flow cutoff or connection in the valve body 4. The valve plate body 3 has three working positions, namely, a fully closed state, a fully open state and an inspection state.

[0084] When the valve is fully closed, the valve plate drive mechanism 2 drives the valve plate body 3 from the fully open position of the valve to completely isolate the water-containing part of the inner cavity of the valve body 4 from other spaces. At this time, the first seal 5 and the second seal 6 on the valve body 4 are in close contact with the end faces of the contact position of the valve body 4 to form a sealing surface, which will effectively prevent the medium in the pipeline valve body 4 from flowing to other spaces through the gap between the valve plate body 3 and the inner cavity of the valve body 4, thereby completely cutting off the flow of the medium in the inner cavity of the valve body 4. This position is the fully closed position of the working valve plate. When the valve is fully open, the valve plate drive mechanism 2 drives the valve plate body 3 to withdraw in the reverse direction to the inner cavity of the valve body 4 concentric with the center of the pipeline, so that the flow of the pipeline medium is not affected by the working valve plate of the valve body 4. At this time, the position of the valve body 4 is the fully open position. When the valve plate body 3 needs to be repaired and replaced, the valve plate body 3 can be directly withdrawn from the fully closed or fully open position to the maintenance position in the same direction of full opening movement. At this time, the flow of the medium in the valve body 4 is not affected. If the closing time requirement is not considered, the valve plate body 3 can also be set in two positions, that is, the full opening position and the maintenance position are combined into one.

[0085] Among them, a third sealing member 7 is arranged on the inspection valve plate 14, and the movement direction of the third sealing member 7 is at a certain angle or perpendicular to the movement direction of the valve plate body 3. The inspection valve plate 14 has only two working positions: working and waiting. When the valve plate body 3 moves to the uppermost inspection position and needs inspection, the inspection drive mechanism 17 pushes the inspection valve plate 14 forward to the fully closed position, and a sealing interface is formed between the fourth sealing member 18 and the mounting seat 1. At this time, the inspection valve plate 14 divides the operating cavity 8 into two parts, the part connected to the pipeline and the inspection position space where the valve plate body 3 is located. At this time, the movement of the medium in the part connected to the pipeline is not affected, and the third sealing member 7 on the inspection valve plate 14 is in close contact with the operating cavity 8 to form a closed sealing surface, which effectively prevents the flow of media between the two spaces. At this time, the opening Drain valve 16, drain the accumulated water in the inner cavity of valve body 4 at the maintenance position of the working valve, and then open the upper cover of mounting seat 1, so as to overhaul and replace the valve plate body 3 and the first seal 5, the second seal 6 and the valve plate drive mechanism 2 thereon. At this time, the position of the overhaul valve plate 14 is the working position of the overhaul valve plate 14; when the valve plate body 3 does not need to be overhauled, the overhaul valve plate 14 is always locked in the waiting position which does not interfere with the movement of the valve plate body 3. When the valve is fully closed and the valve plate body 3 is at the working position, the side cover plate can be opened to overhaul and replace the overhaul valve plate 14 and its overhaul drive mechanism 17.

[0086] Example 5

[0087] See also Fig. 9 and Fig.10 , Embodiment 5 of the utility model provides a valve that can be repaired and replaced online for sealing and driving components. The valve plate driving mechanism 2 adopts a motor device, which is mainly composed of a reduction motor and a screw rod, and converts electrical energy into a screw rod for linear or rotational motion, thereby driving the valve plate body 3 to move up and down linearly to realize the opening and closing of the valve. Other structures and principles are the same as those of Embodiment 4, and will not be repeated here.

[0088] Example 6

[0089] See also Fig.11 and Fig.12 , Embodiment 6 of the utility model provides a valve that can be repaired and replaced online for sealing and driving components. The valve plate driving mechanism 2 adopts a driving hand wheel, which is mainly composed of a screw rod and a rotating wheel. The screw rod is rotated by manpower to make a linear or rotary motion. If the screw rod is in a linear motion, the screw rod drives the valve plate body 3 to move up and down, thereby realizing the opening and closing of the valve. This is called a rising stem valve; if the screw rod is in a rotary motion, the valve plate is driven by a nut matched with the screw rod to move up and down linearly, thereby realizing the opening and closing of the valve. This is called a concealed stem valve. Other structures and principles are the same as those of Embodiment 4, and will not be repeated here.

[0090] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0091] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A valve capable of online maintenance and replacement of sealing and driving components, characterized in that: It comprises a mounting seat (1), a valve plate driving mechanism (2), a valve plate body (3), a valve body (4), a first sealing member (5), a second sealing member (6) and a third sealing member (7); An operating cavity (8) is formed inside the mounting seat (1), the valve plate driving mechanism (2) is fixed to the upper end of the mounting seat (1), the valve plate body (3) is connected to the valve plate driving mechanism (2), the valve body (4) is connected to the bottom of the mounting seat (1), and a valve plate inlet and outlet (9) is formed on the upper part of the valve body (4), and the valve plate inlet and outlet (9) are connected between the operating cavities (8); The first sealing member (5) is connected to the left side of the valve plate body (3), and the second sealing member (6) is connected to the right side of the valve plate body (3); the third sealing member (7) is arranged at the valve plate inlet and outlet (9); The valve plate driving mechanism (2) drives the valve plate body (3) to enter and exit the valve body (4) through the valve plate inlet and outlet (9), so that the valve has an open state and a closed state. When the valve is in an open state, the first sealing member (5) and the second sealing member (6) are located in the operating cavity (8), and a sealing interface is formed between the lower portion of the valve plate body (3) and the third sealing member (7); When the valve is in a closed state, a sealing interface is formed at the contact position between the first sealing member (5) and the valve body (4); a sealing interface is formed between the upper part of the valve plate body (3) and the third sealing member (7); and a sealing interface is formed at the contact position between the second sealing member (6) and the valve body (4).

2. A valve capable of online repair and replacement of sealing and driving components according to claim 1, characterized in that: One end of the valve body (4) is connected to a first flange (10), and the other end of the valve body (4) is connected to a second flange (11).

3. A valve capable of online repair and replacement of sealing and driving components according to claim 1, characterized in that: A sealing notch (12) is formed at the bottom of the valve body (4), and when the valve is in a closed state, the valve plate body (3) is placed inside the sealing notch (12).

4. A valve capable of online repair and replacement of sealing and driving components according to claim 1, characterized in that: The valve plate driving mechanism (2) adopts a hydraulic driving device or a pneumatic driving device.

5. A valve capable of online repair and replacement of sealing and driving components according to claim 1, characterized in that: The valve plate driving mechanism (2) adopts a motor device.

6. A valve capable of online repair and replacement of sealing and driving components according to claim 1, characterized in that: The valve plate driving mechanism (2) adopts a driving hand wheel.

7. A valve capable of online maintenance and replacement of sealing and driving components, characterized in that: It comprises a mounting seat (1), a valve plate driving mechanism (2), a valve plate body (3), a valve body (4), a first sealing member (5), a second sealing member (6), a maintenance valve body (13), a maintenance valve plate (14) and a third sealing member (7); An operating cavity (8) is formed inside the mounting seat (1), the valve plate driving mechanism (2) is fixed to the upper end of the mounting seat (1), the valve plate body (3) is connected to the valve plate driving mechanism (2), the valve body (4) is connected to the bottom of the mounting seat (1), and a valve plate inlet and outlet (9) is formed on the upper part of the valve body (4), and the valve plate inlet and outlet (9) are connected between the operating cavities (8); The first sealing member (5) is connected to the left side of the valve plate body (3), and the second sealing member (6) is connected to the right side of the valve plate body (3); the inspection valve body (13) is connected to the side of the mounting seat (1), and the inspection valve plate (14) is connected to the inspection valve body (13); the third sealing member (7) is connected to the bottom of the inspection valve plate (14); The valve plate driving mechanism (2) drives the valve plate body (3) to enter and exit the valve body (4) through the valve plate inlet and outlet (9), so that the valve has an open state, a closed state and an inspection state. When the valve is in an open state, the first sealing member (5) and the second sealing member (6) are located in the operating cavity (8), and the inspection valve plate (14) is located inside the inspection valve body (13); When the valve is in a closed state, a sealing interface is formed at a contact position between the first sealing member (5) and the valve body (4); a sealing interface is formed at a contact position between the second sealing member (6) and the valve body (4), and the inspection valve plate (14) is located inside the inspection valve body (13); In the valve maintenance state, the first sealing member (5) and the second sealing member (6) are located in the operating cavity (8), and a sealing interface is formed between the third sealing member (7) at the bottom of the maintenance valve plate (14) and the inner wall of the operating cavity (8).

8. A valve capable of online repair and replacement of sealing and driving components according to claim 7, characterized in that: A sealing notch (12) is formed at the bottom of the valve body (4), and when the valve is in a closed state, the valve plate body (3) is placed inside the sealing notch (12); The top of the mounting seat (1) is connected to an air valve (15); the side of the mounting seat (1) is connected to a drain valve (16); The drain valve (16) is located above the inspection valve body (13).

9. A valve capable of online repair and replacement of sealing and driving components according to claim 7, characterized in that: The valve plate driving mechanism (2) adopts one of a hydraulic driving device, a pneumatic driving device, a motor device and a driving hand wheel.

10. A valve capable of online repair and replacement of sealing and driving components according to claim 7, characterized in that: The inspection valve plate (14) is connected to an inspection drive mechanism (17), and the inspection drive mechanism (17) adopts one of a hydraulic drive device, a pneumatic drive device, a motor device and a drive hand wheel; The exterior of the inspection valve plate (14) is also connected to a fourth sealing member (18); in a valve inspection state, a sealing interface is formed between the fourth sealing member (18) and the mounting seat (1).

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