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CN-224214736-U - Gate valve with stable gate structure

CN224214736UCN 224214736 UCN224214736 UCN 224214736UCN-224214736-U

Abstract

The utility model discloses a knife gate with a stable gate structure, which has the technical scheme that the knife gate comprises a valve body, a gate inserted in the valve body and a valve seat capable of forming hard seal with the gate, wherein a small flow passage and a large flow passage which are respectively positioned at two sides of the gate are arranged in the valve body, a top guide block positioned at the highest point of the inner wall of the large flow passage, two middle guide blocks which are respectively positioned at two sides of a vertical surface with the diameter of the large flow passage and are positioned at a height lower than the height of the top guide block, and two bottom guide blocks which are respectively positioned at two sides of the vertical surface with the diameter of the large flow passage and are positioned at a height lower than the height of the middle guide block positioned at the same side are sequentially contacted with the gate by the top guide block, so that the gate keeps a vertical state by propping the top guide block, the middle guide block and the bottom guide block, and the problem that the gate in the prior art is easy to deform under the pushing of a medium so that the sealing performance is reduced is solved.

Inventors

  • WANG XIAOPING
  • WU ZHIFA
  • WU ZHANGFU

Assignees

  • 浙江南辉阀门有限公司

Dates

Publication Date
20260508
Application Date
20250626

Claims (7)

  1. 1. The utility model provides a stable in structure's of flashboard knife gate, includes valve body (1), peg graft flashboard (2) in valve body (1) and can form sealed disk seat (3) firmly with flashboard (2), be provided with in valve body (1) respectively and be located small runner (4) and big runner (5) of flashboard (2) both sides, wherein be provided with one on the inner wall of big runner (5) and be located top guide block (6) of big runner (5) inner wall peak department, two respectively be located big runner (5) diameter place vertical face both sides and be located in high well guide block (7) and two respectively be located big runner (5) diameter place vertical face both sides and be located high bottom guide block (8) of being located high being less than in the same side of guide block (7) that make flashboard (2) keep vertical state through top guide block (6), well guide block (7) and bottom guide block (8) touch with flashboard (2) in succession.
  2. 2. The knife gate valve with the stable flashboard structure according to claim 1, wherein the lengths of the bottom guide block (8) and the top guide block (6) in the circumferential direction of the inner wall of the large flow passage (5) are smaller than the lengths of the middle guide block (7) in the circumferential direction of the inner wall of the large flow passage (5).
  3. 3. The knife gate valve with the stable flashboard structure according to claim 2, wherein the widths of the bottom guide block (8) and the top guide block (6) in the inner diameter direction of the large flow passage (5) are smaller than the width of the middle guide block (7) in the inner diameter direction of the large flow passage (5).
  4. 4. A knife gate with stable gate structure according to claim 2 or 3, characterized in that the middle guide block (7) is provided with a through hole (9) for medium flow.
  5. 5. A knife gate valve with stable gate structure according to claim 1, 2 or 3, characterized in that the surface of the middle guide block (7) facing the gate (2) is a cambered surface and protrudes towards the gate (2).
  6. 6. A knife gate with stable gate structure according to claim 1, 2 or 3 is characterized in that two middle guide blocks (7) are symmetrically arranged on the vertical plane where the diameter of the large runner (5) is located.
  7. 7. A knife gate with stable gate structure according to claim 1, 2 or 3, characterized in that the two bottom guide blocks (8) are symmetrically arranged relative to the vertical plane where the diameter of the large runner (5) is located.

Description

Gate valve with stable gate structure Technical Field The utility model relates to the technical field of knife gate valves, in particular to a knife gate valve with a stable flashboard structure. Background The knife gate valve belongs to a cut-off valve, has the advantages of small volume, small flow resistance and convenient disassembly and assembly, and is widely applied to industrial and urban life pipelines at present. When the knife gate valve needs to be opened or closed, the hand wheel is swung to rotate the nut so as to drive the valve rod and further drive the flashboard to move up and down. Most of the existing knife gate valves are one-way valves, namely, the medium flow direction flows from a large-caliber channel of a valve body to a small-caliber channel, a flashboard is pressed against a sealing surface of a valve seat by means of medium pressure to realize sealing, but under certain specific use environments, the medium flows bidirectionally or the knife gate valve needs to be reversely assembled, the medium flow direction flows from the small-caliber channel of the valve body to the large-caliber channel of the valve body, the flashboard is bent and deformed under the pushing of the medium and is partially separated from the sealing surface of the valve seat, and the result of medium leakage is caused, so that the existing knife gate valve has the problems of small application range and poor structural stability of the flashboard. Disclosure of utility model Aiming at the defects of the prior art, the utility model aims to provide a knife gate valve which can realize bidirectional flow, has a stable flashboard structure and has good sealing property. The utility model provides a knife gate with a stable flashboard structure, which comprises a valve body, a flashboard inserted in the valve body and a valve seat capable of forming hard seal with the flashboard, wherein a small flow channel and a large flow channel which are respectively positioned at two sides of the flashboard are arranged in the valve body, a top guide block positioned at the highest point of the inner wall of the large flow channel, two middle guide blocks which are respectively positioned at two sides of a vertical surface with the diameter of the large flow channel and are positioned at a height lower than the height of the top guide block, and two bottom guide blocks which are respectively positioned at two sides of the vertical surface with the diameter of the large flow channel and are positioned at a height lower than the height of the middle guide block at the same side are arranged on the inner wall of the large flow channel, so that the flashboard is kept in a vertical state by propping contact with the flashboard in sequence. As a further improvement of the utility model, the lengths of the bottom guide block and the top guide block in the circumferential direction of the inner wall of the large flow passage are smaller than the lengths of the middle guide block in the circumferential direction of the inner wall of the large flow passage. As a further improvement of the present utility model, the widths of the bottom guide block and the top guide block in the large flow passage inner diameter direction are smaller than the widths of the middle guide block in the large flow passage inner diameter direction. As a further improvement of the utility model, the middle guide block is provided with a through hole for medium circulation. As a further improvement of the utility model, the surface of the middle guide block facing the flashboard is an arc surface and protrudes towards the flashboard. As a further improvement of the utility model, the two middle guide blocks are symmetrically arranged on the vertical plane where the diameter of the large flow passage is located. As a further improvement of the utility model, the two bottom guide blocks are symmetrically arranged on the vertical plane where the diameter of the large flow channel is located. The utility model has the advantages that the top guide block, the middle guide block and the bottom guide block are contacted with the flashboard in sequence to enable the flashboard to keep a vertical state, compared with the prior art, the design of the top guide block and the middle guide block can meet the requirement of bidirectional flow of media, the application range is wider, the design of the top guide block and the middle guide block can provide different degrees of supporting effects when the medium flux is reduced to locally generate larger thrust on the flashboard, the bending resistance of the flashboard is indirectly improved, the flashboard is ensured to always keep the vertical state, the flashboard and a valve seat are beneficial to form effective hard sealing, the design of the bottom guide block can provide support for the edge of the bottom of the flashboard, the defect that the thickness of the bottom of the flashboard is thinner and is easy to de