Bidirectional sealing knife gate valve

Abstract

The utility model discloses a bidirectional sealing knife gate valve which comprises a valve body, the upper portion of the valve body is connected with an actuator, a gate plate is arranged in the valve body, lining valve seats are arranged on the side wall of the upper portion and the side wall of the lower portion in the valve body, and the gate plate is inserted into the valve body, passes through the lining valve seats and penetrates out of the bottom of the valve body. An upper filler and an upper filler pressing plate are arranged on the upper portion of the valve body, the upper filler pressing plate presses the upper filler, a lower filler and a lower filler pressing plate are arranged on the lower portion of the valve body, and the lower filler pressing plate presses the lower filler. Two-way sealing can be achieved, and material accumulation is avoided in the opening and closing process. And the device is especially suitable for liquid, powder and other pure medium working conditions.

Description

Technical Field

[0001] The utility model relates to a valve, in particular to a bidirectional sealing knife gate valve. Background Art

[0002] Knife-type gate valves are mainly used as regulating and intercepting devices in pipelines such as tap water, sewage, construction, petroleum, chemical industry, food, medicine, textile, electricity, shipbuilding, metallurgy, and energy systems. They are based on ordinary gate valves, with the flat valve disc replaced by a knife-shaped valve disc. Knife-type gate valves, with their advantages of small size, small flow resistance, light weight, easy installation and easy disassembly, solve the problems of large flow resistance, heavy weight, difficult installation, and large floor space occupied by ordinary gate valves, flat gate valves, ball valves, stop valves, regulating valves, butterfly valves, and other valves.

[0003] The knife-type gate valves currently on the market are one-way sealing valves. When pipeline pressure increases and a reverse pressure differential occurs, they cannot effectively seal. The cavity inside the valve is prone to material accumulation and agglomeration, which can increase valve torque and damage the gate. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a bidirectional sealing knife gate valve.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A two-way sealing knife gate valve includes a valve body, the upper part of the valve body is connected to the actuator, a gate is provided in the valve body, the upper side wall and the lower side wall of the valve body are provided with a lined valve seat, the gate is inserted into the valve body, passes through the lined valve seat and passes through the bottom of the valve body, an upper packing and an upper packing pressure plate are installed on the upper part of the valve body, the upper packing pressure plate presses the upper packing, and a lower packing and a lower packing pressure plate are installed on the lower part of the valve body, the lower packing pressure plate presses the lower packing.

[0007] As a further improvement, the lined valve seat is made of PTFE valve seat or rubber material.

[0008] As a further improvement, a groove is provided on the inner wall of the valve body, and the liner valve seat is embedded in the groove.

[0009] As a further improvement, the valve body includes a left valve body and a right valve body, and the left valve body and the right valve body are locked and connected by bolts.

[0010] As a further improvement, the left valve body passes through the liner valve seat and is connected to the right valve body via bolts.

[0011] As a further improvement, the gate plate is made of metal material.

[0012] As a further improvement, the upper packing and the lower packing are embedded in the valve body, the upper packing pressure plate is installed at the upper port of the valve body, and the lower packing pressure plate is fixedly installed at the lower port of the valve body.

[0013] Compared with the prior art, the present invention has the following beneficial technical effects:

[0014] By installing packing and packing pressure plates at the upper and lower parts of the valve body, and lengthening the gate so that it extends beyond the valve body, the lined valve seat remains in contact with the gate throughout the valve body's entire service life. The lined valve seats in the left and right valve bodies will not fall off or come into contact. During the valve's opening and closing, the lined valve seats will wear. When wear reaches a predetermined level, simply disassemble the left and right valve bodies and replace the lined valve seats. The lined valve seats are made of non-metallic material, while the gate is metal. The metal gate compresses the non-metallic lined valve seat, achieving a bidirectional seal and preventing material accumulation during opening and closing. This system is particularly suitable for working with pure media such as liquids and powders. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the cross-sectional structure of the utility model;

[0016] Figure 2 for Figure 1 A is an enlarged schematic diagram;

[0017] Figure 3 for Figure 1 Enlarged schematic diagram of point B in FIG. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0019] In the description of the present invention, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like are used to indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0020] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, removable connections, or integral connections. They may refer to mechanical connections or electrical connections. They may refer to direct connections or indirect connections through an intermediary, and they may refer to internal communication between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0021] like Figure 1-3 As shown, a two-way sealing knife gate valve includes a valve body, the upper portion of which is connected to an actuator 1. A gate 2 is provided within the valve body. The upper and lower side walls of the valve body are both provided with lined valve seats 3. The gate 2 is inserted into the valve body, passes through the lined valve seats 3, and exits from the bottom of the valve body. An upper packing 6 and an upper packing pressure plate 7 are installed on the upper portion of the valve body, which presses the upper packing 6. A lower packing 8 and a lower packing pressure plate 9 are installed on the lower portion of the valve body, which presses the lower packing 8. By providing upper and lower packing at the upper and lower portions of the valve body, respectively, a two-way seal is achieved at the upper and lower portions of the valve body. The gate is lengthened so that it extends through the exterior of the valve body.

[0022] The inner lining valve seat 3 is made of PTFE valve seat or rubber material, and the gate plate 2 is made of metal material. After assembly and tightening, the metal gate plate will press the inner lining valve seat to further improve the sealing performance.

[0023] The inner wall of the valve body is provided with a groove, and the lining valve seat is embedded in the groove to ensure the stability of the assembly. Moreover, after assembly, the outer side surface of the lining valve seat remains flat with the inner side wall of the valve body.

[0024] The valve body comprises a left valve body 4 and a right valve body 5 which are connected by bolt locking, a plurality of bolts in different positions are arranged, and a part of the bolts are locked through the inner lining valve seat.

[0025] The upper packing 6 and the lower packing 8 are embedded in the valve body, the upper packing pressing plate 7 is arranged at the upper port of the valve body, and the lower packing pressing plate 9 is fixedly arranged at the lower port of the valve body.

[0026] After assembly, the valve is in an open state. When the gate plate moves upward, the gate plate exposed outside the valve body is moved to the position of the flow passage hole of the valve body, and the valve is closed. The inner lining valve seat is made of non-metal material, and the gate plate is made of metal material. The metal gate plate compresses the non-metal inner lining valve seat to realize bidirectional sealing.

[0027] It should be noted that the above is only the preferred embodiment of the present application and is not used to limit the present application. Although the present application is described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or replace some of the technical features with equivalent ones, but any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A two-way sealing knife gate valve, comprising a valve body, characterized in that: The upper part of the valve body is connected to the actuator, and a gate is provided in the valve body. The upper side wall and the lower side wall of the valve body are both provided with lined valve seats. The gate is inserted into the interior of the valve body, passes through the lined valve seat and goes out from the bottom of the valve body. The upper part of the valve body is provided with an upper packing and an upper packing pressure plate, and the upper packing pressure plate presses the upper packing. The lower part of the valve body is provided with a lower packing and a lower packing pressure plate, and the lower packing pressure plate presses the lower packing.

2. The bidirectional sealing knife gate valve according to claim 1, characterized in that: The lined valve seat is made of PTFE valve seat or rubber material.

3. The bidirectional sealing knife gate valve according to claim 1, characterized in that: A groove is provided on the inner wall of the valve body, and the liner valve seat is embedded in the groove.

4. The bidirectional sealing knife gate valve according to claim 1, characterized in that: The valve body comprises a left valve body and a right valve body, and the left valve body and the right valve body are locked and connected by bolts.

5. The bidirectional sealing knife gate valve according to claim 4, characterized in that: The left valve body passes through the liner valve seat and is connected to the right valve body via bolts.

6. The bidirectional sealing knife gate valve according to claim 1, characterized in that: The gate plate is made of metal material.

7. The bidirectional sealing knife gate valve according to claim 1, characterized in that: The upper packing and the lower packing are embedded in the valve body, the upper packing pressure plate is installed at the upper port of the valve body, and the lower packing pressure plate is fixedly installed at the lower port of the valve body.

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