Forged steel knife type gate valve

Abstract

The utility model discloses a forged steel knife type gate valve which comprises a valve body and a power unit, the valve body comprises a gate portion and a cover cavity, the gate portion comprises a valve seat, a rubber strip, a scraping ring, a rubber seat and a flange gland, a rubber ring lining is further arranged in the valve seat, and the flange gland is fixed on the valve seat through a stud piece to press the rubber ring lining. A gate plate cavity is formed between the valve seats on the two sides and the rubber ring lining, a gate plate piece is arranged in the gate plate cavity, the width of the gate plate piece is larger than the diameter of the rubber ring lining, drain outlets are formed in the bottoms of the two valve seats, and a bottom cover used for sealing the drain outlets is arranged at the bottom end of the gate part. According to the knife-shaped gate valve, the symmetrical rubber ring bushes are arranged to comprehensively wrap the valve cavity, the problems that a medium enters the valve cavity to cause opening and closing difficulty and blockage are effectively prevented, a valve cavity medium flow channel formed by the symmetrical rubber ring bushes adopts a straight-through type medium, smooth circulation is easier, direct contact between the medium and the valve seat is reduced through full wrapping of the rubber ring bushes, and the service life of the valve seat is prolonged. And the flange glands at the two ends can be used for quickly replacing, cleaning and maintaining the device.

Description

Technical Field

[0001] The utility model relates to the technical field of gate valves, in particular to a forged steel knife gate valve. Background Art

[0002] A gate valve is a closing member, i.e., a gate plate. The moving direction of the gate plate is perpendicular to the fluid direction. The gate valve can only be fully opened and fully closed, and cannot be used for regulation and throttling. The gate valve is sealed by the contact between the valve seat and the gate plate. Usually, the sealing surface is surfacing welded with metal materials to increase wear resistance, such as surfacing welding 1Cr13, STL6, stainless steel, etc. The gate plate has a rigid gate plate and an elastic gate plate. According to the different gate plates, the gate valve is divided into a rigid gate valve and an elastic gate valve.

[0003] The forged steel knife gate valve is manufactured by forging process, which makes up for and overcomes the defect that the conventional knife gate valve cannot withstand medium and high pressures. The valve and key accessories are integrally treated by special strengthening, and can withstand various medium and high pressure working conditions. It is mainly used to control the fluid containing solid particles, fibers or viscous and easy-to-crystallize media.

[0004] The knife gate valve has a knife-shaped bevel cut at the bottom of the flat valve plate, which has the function of cutting off the medium, so that the closing of the valve is not blocked by the medium. It is mainly used as a valve inside the pipeline where the liquid flows to interrupt the liquid. It has a wide range of applications. When the common knife gate valve is in use, the problems that are likely to occur include the wear between the gate plate and the sealing structure, and the sealing structure of the knife gate valve is complex and not easy to disassemble and assemble, making its later maintenance relatively difficult. Summary of the Utility Model

[0005] In view of the prior art, the purpose of the utility model is to provide a knife gate valve with a simple structure and convenient maintenance.

[0006] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: a forged steel knife gate valve, including a valve body and a power unit. The valve body includes a gate part and a cover cavity. The gate part includes a valve seat, a rubber strip, a scraping ring, a rubber seat and a flange gland. A rubber ring bushing is also arranged in the valve seat. The flange gland is fixed on the valve seat through stud parts to compress the rubber ring bushing. A gate plate cavity is formed between the valve seats and the rubber ring bushings on both sides. A gate plate part is arranged in the gate plate cavity. The width of the gate plate part is greater than the diameter of the rubber ring bushing. Drain ports are arranged at the bottoms of the two valve seats. A bottom cover is arranged at the bottom end of the gate part for closing the drain ports.

[0007] As a further setting of the above scheme, the rubber strip is located on both sides of the rubber seat, and the valve seat is provided with a rubber groove matching the rubber strip. The scraping ring is arranged on the upper part of the valve seat and sleeved outside the gate plate part.

[0008] As a further setting of the above solution, a blade surface is provided at the front end of the gate member, and the rubber ring bushings provided in the inner holes of the two valve seats are abutted against each other. The abutting position of the two rubber ring bushings is on the moving stroke of the gate member, and the outer side of the rubber ring bushing is provided with an inclined surface to cooperate with the blade surface.

[0009] As a further setting of the above solution, the bottom cover is provided with a leak-proof gasket, and the bottom cover is fixedly installed with the valve seat by setting bolts.

[0010] As a further setting of the above solution, the power unit includes a valve stem and a handwheel, and one end of the valve stem is also fixed to the gate member.

[0011] As a further setting of the above solution, an indicating groove is provided on the outer shell of the cover cavity, and an indicating rod extending out of the indicating groove is fixed on the gate member.

[0012] Beneficial effects: The knife gate valve of the present utility model is provided with two fixed valve body seats, with a simple structure and scientific design, which is more convenient for disassembly and assembly. The sewage discharge port provided at the bottom of the valve body seat cavity can facilitate the sewage discharge of the valve body cavity. The gate member is provided with symmetric rubber ring bushings to fully wrap the valve cavity, effectively preventing the medium from entering the valve cavity and causing problems such as difficult and stuck opening and closing. The valve cavity medium flow channel formed by the symmetric rubber ring bushings adopts a straight-through design, making the valve cavity flow channel a straight-through flow channel without slag accumulation, residue retention, or slag jamming, and is particularly suitable for use with various media containing valve stem dust, solid particles, gas-liquid, or easily crystallized media. The full wrapping of the rubber ring bushings not only reduces the direct contact between the medium and the valve seat, but also can quickly replace and clean and maintain it through the flange gland at both ends. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the knife gate valve of the present utility model.

[0014] Figure 2 It is a schematic structural diagram of the knife gate valve assembly of the present utility model.

[0015] Figure 3 It is a schematic structural diagram of the knife gate valve from the side view of this embodiment.

[0016] Figure 4 It is a schematic cross-sectional structural diagram of the knife gate valve of this embodiment.

[0017] Reference numerals: 1, valve body; 2, power unit; 21, valve stem; 22, handwheel; 3, gate plate member; 31, cutting surface; 32, inclined surface; 4, cover cavity; 41, outer shell cover; 42, indicating groove; 43, indicating rod; 5, gate portion; 50, rubber groove; 51, valve seat; 52, rubber strip; 53, scraping ring; 54, rubber seat; 55, flange gland; 56, rubber ring bushing; 57, gate plate cavity; 58, drain port; 59, bottom cover; 591, anti-leakage gasket; 592, bolt. Detailed implementation manners

[0018] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0019] As Figures 1-4 shown, a forged steel knife gate valve includes a valve body 1 and a power unit 2. The valve body 1 includes a gate portion 5 and a cover cavity 4. The gate portion 5 includes a valve seat 51, a rubber strip 52, a scraping ring 53, a rubber seat 54 and a flange gland 55. A rubber ring bushing 56 is further provided in the valve seat 51. The flange gland 55 is fixed on the valve seat 51 through a stud member to compress the rubber ring bushing 56. A gate plate cavity 57 is formed between the valve seats 51 and the rubber ring bushings 56 on both sides. A gate plate member 3 is provided in the gate plate cavity 57. The width of the gate plate member 3 is greater than the diameter of the rubber ring bushing 56. During use, the gate plate member 3 is inserted between the two rubber ring bushings 56 by lifting and lowering. The rubber ring bushing 56 is compressed by the flange glands 55 at both ends. The deformation formed by excessive compression can improve the sealing performance. In this embodiment, the rubber strip 52 is located on both sides of the rubber seat 54, and a rubber groove 50 matching the rubber strip 52 is provided on the valve seat 51. The scraping ring 53 is arranged on the upper part of the valve seat 51 and sleeved outside the gate plate member 3. The scraping ring 53 is sleeved outside the gate plate member 3. When the gate plate member 3 is lifted and lowered, its surface is scraped. Before scraping, the gate plate member 3 actually passes through the inner ring of the rubber ring bushing 56 for scraping first. The residual medium after one scraping is scraped again by the scraping ring 53 to prevent the medium from being carried out of the inner cavity of the valve seat 51. And when the gate plate member 3 descends, it can scrape the gate plate member 3 to prevent some dust, stains and impurities in the non-fully sealed cover cavity 4 from being brought into the medium flow channel when rising and polluting the medium.

[0020] Referring to Figures 1-2 shown, the gate valve of the present invention is driven by the power unit 2, and the valve stem 21 is driven to lift and lower through the handwheel 22. As Figure 1 and Figure 2As shown, its principle is that the main shaft of the handwheel 22 is connected to a transmission structure meshing with the valve stem 21. When the handwheel 22 rotates forward and backward, the valve stem 21 is driven to rise and fall through the transmission structure. The rise and fall of the valve stem 21 drives the gate member 3 to rise and fall, and the gate member 3 is controlled by the handwheel 22 to open and close the medium flow passage of the gate valve.

[0021] Furthermore, in the above structure, the valve body 1 of this embodiment is divided into a cover cavity 4 and a gate part 5. The cover cavity 4 is used to isolate from the outside after the gate member 3 rises and falls. Although the cover cavity 4 formed by the outer shell cover 41 is not hermetically isolated, it also reduces the contact with the outside. In addition, an indicating groove 42 is provided on the outer shell cover 41, and an indicating rod 43 is fixed on the gate member 3. One end of the indicating rod 43 extends out of the indicating groove 42. During the rise and fall of the gate member 3, the indicating rod 43 moves in the indicating groove 42. Cooperating with the graduation scale provided on the outer shell cover 41, it is convenient for the staff to quickly determine the lifting height of the gate member 3 and the working state of the gate valve.

[0022] Furthermore, the gate part 5 of the valve body 1 of this embodiment includes Figure 2 as shown, two valve seats 51 connected and fixed relatively by screws. A rubber seat 54 and a rubber strip 52 are arranged between the two valve seats 51. The rubber strip 52 is embedded in the rubber groove 50 on the opposite surface of the valve seat 51. The gate part 5 of this embodiment constitutes the moving cavity of the gate member 3 through the valve seat 51, the rubber strip 52 and the rubber seat 54. As described above, the valve stem 21 is driven to rise and fall by the power unit 2, driving the gate member 3 to switch the opening and closing working state of the gate valve.

[0023] As a further setting of the above solution, a knife edge 31 is provided at the front end of the gate member 3. The rubber ring bushings 56 provided in the inner holes of the two valve seats 51 are abutted against each other. The abutting position of the two rubber ring bushings 56 is on the moving stroke of the gate member 3, and a slope 32 is provided on the outer side of the rubber ring bushing 56 to cooperate with the knife edge 31.

[0024] In the above structural setting, referring to Figure 4 of this embodiment, a knife edge 31 is provided at the lower end of the gate member 3, and a slope 32 is provided at the abutting position of the two rubber ring bushings 56. During use, the valve stem 21 drives the gate member 3 to descend, and the knife edge 31 at the lower end is just right against the slope 32 and is stuck between the rubber ring bushings 56. The concave surface formed by the two slopes 32 on both sides can facilitate the cutting-in of the knife edge 31 and avoid more wear on the rubber ring bushings 56.

[0025] As a further setting of the above solution, drain ports 58 are provided at the bottoms of the two valve seats 51. A bottom cover 59 for closing the drain ports 58 is provided at the bottom end of the gate portion 5. The bottom cover 59 is provided with a leak-proof gasket 591. The bottom cover 59 is fixedly installed on the valve seat 51 by means of bolts 592. The leak-proof gasket 591 is pressed against the bottom of the valve seat 51 by the bolts 592 passing through the bottom cover 59 for plugging the drain ports 58. The function of the drain ports 58 in this embodiment is to discharge the medium in the inner cavity of the valve body 1.

[0026] As a further setting of the above solution, the power unit 2 includes a valve stem 21 and a handwheel 22. One end of the valve stem 21 is also fixed to the gate plate member 3.

[0027] As a further setting of the above solution, an indicating groove 42 is provided on the outer housing 41 of the cover cavity 4. An indicating rod 43 extending out of the indicating groove 42 is fixed on the gate plate member 3.

[0028] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the present invention's solution and its equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A forged steel knife gate valve, characterized in that: It includes a valve body (1) and a power unit (2). The valve body (1) includes a gate part (5) and a cover cavity (4). The gate part (5) includes a valve seat (51), a rubber strip (52), a scraping ring (53), a rubber seat (54), and a flange gland (55). A rubber ring bushing (56) is further provided in the valve seat (51). The flange gland (55) is fixed on the valve seat (51) by a stud to compress the rubber ring bushing (56). A gate plate cavity (57) is formed between the valve seats (51) and the rubber ring bushings (56) on both sides. A gate plate member (3) is provided in the gate plate cavity (57). The width of the gate plate member (3) is greater than the diameter of the rubber ring bushing (56). Drain ports (58) are provided at the bottoms of the two valve seats (51). A bottom cover (59) for closing the drain port (58) is provided at the bottom end of the gate part (5).

2. The forged steel knife gate valve according to claim 1, wherein: The rubber strip (52) is located on both sides of the rubber seat (54), and a rubber groove (50) matching the rubber strip (52) is provided on the valve seat (51). The scraping ring (53) is arranged at the upper part of the valve seat (51) and sleeved outside the gate plate member (3).

3. The forged steel knife gate valve according to claim 1, characterized in that: A knife surface (31) is provided at the front end of the gate plate member (3). The rubber ring bushings (56) provided in the inner holes of the two valve seats (51) are abutted against each other. The abutting position of the two rubber ring bushings (56) is on the moving stroke of the gate plate member (3), and an inclined surface (32) is provided on the outer side of the rubber ring bushing (56) to cooperate with the knife surface (31).

4. A forged steel knife gate valve according to claim 1, characterized in that: The bottom cover (59) is provided with a leak-proof gasket (591), and the bottom cover (59) is fixedly installed with the valve seat (51) by setting bolts (592).

5. The forged steel knife gate valve according to claim 1, characterized in that: The power unit (2) includes a valve rod (21) and a handwheel (22). One end of the valve rod (21) is also fixed to the gate plate member (3).

6. The forged steel knife gate valve according to claim 1, characterized in that: An indicating groove (42) is provided on the outer shell cover (41) of the cover cavity (4). An indicating rod (43) extending out of the indicating groove (42) is fixed on the gate plate member (3).

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