Improved large-caliber flat gate valve with flow guide hole

Abstract

An improved large-diameter flat gate valve with flow guide holes comprises a valve body, and channel end covers are installed at the two ends of the valve body to form the whole valve body. A belleville spring seat ring is arranged between the channel end cover and the valve body; a plurality of belleville spring assemblies are arranged in the belleville spring seat ring; the belleville spring seat ring comprises a body and protrusions extending out of the body from the upper end face and the lower end face of the body, the outer wall of the upper protrusion is in sealed connection with the inner wall of the channel end cover through a dustproof graphite rope, and the end face of the lower protrusion is in sealed connection with the valve seat through a sealing ring. The end face of the channel end cover is connected with the valve body through a gasket. The multiple sets of small belleville spring assemblies are arranged on the rear portion of the valve seat, and the advantages that belleville springs are small in deformation, high in bearing capacity, high in damping performance, easy to purchase and capable of saving space are brought into full play; the channel end covers are arranged at the two ends of the valve body, when the valve seat breaks down and needs to be maintained, the valve seat assembly can be maintained on line without opening the middle cavity of the valve, and convenience and rapidness are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of valve manufacturing, and in particular relates to an improved large-caliber flat gate valve with a guide hole. Background Art

[0002] Flat gate valves are widely used in oil refining, chemical industry, coal gasification, natural gas, liquefied petroleum gas and other industries. When designing flat gate valves, a spring is set at the rear of the valve seat, one is to maintain the pre-tightening specific pressure of the flat gate valve sealing surface, and the other is to compensate for the expansion and contraction of the valve caused by temperature changes. Generally, small-diameter (DN<100) flat gate valves use butterfly springs, and large-diameter (DN>100) flat gate valves use array cylindrical spiral springs.

[0003] However, when the diameter of the flat gate valve is ≥ DN700, the large-diameter valve is prone to vibration due to the flow of the medium during operation, and the cylindrical spiral spring has low shock absorption performance, is relatively large in height, occupies a large space, and increases the size of the valve; moreover, when all flat gate valves have a fault in the valve seat and need to be repaired, the valve cavity must be opened, the valve stem and gate plate must be taken out first, and then the valve seat and other components can be taken out before repair. Summary of the invention

[0004] The invention provides an improved large-caliber flat gate valve with a guide hole, which can be maintained online and has a small valve volume.

[0005] The technical solution adopted by the present invention is: An improved large-diameter flat gate valve with a guide hole comprises a valve body, both ends of which are equipped with channel end covers to form an integral valve body; a butterfly spring seat ring is arranged between the channel end cover and the valve body; a plurality of butterfly spring assemblies are arranged in the butterfly spring seat ring; the butterfly spring seat ring comprises a main body and protrusions extending out of the main body at the upper and lower end surfaces of the main body, the outer wall of the upper protrusion is sealed and connected to the inner wall of the channel end cover through a dustproof graphite rope, and the end face of the lower protrusion is sealed and connected to the valve seat through a sealing ring; the end face of the channel end cover is connected to the valve body through a gasket.

[0006] The butterfly spring assembly comprises a butterfly spring, a retaining ring, a pin shaft and an elastic retaining ring for an axis. The small end of the pin shaft is sequentially fitted with the butterfly spring and the retaining ring, and then the three are connected as a whole by using an elastic retaining ring for an axis.

[0007] The present invention arranges a plurality of groups of small butterfly spring assemblies at the rear of the valve seat, which gives full play to the advantages of the butterfly spring such as small deformation, high bearing capacity, strong shock absorption, easy procurement and space saving; secondly, channel end covers are arranged at both ends of the valve body. When the valve seat fails and needs maintenance, the valve seat assembly can be repaired online without opening the valve cavity, which is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1It is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 The enlarged schematic diagram of Part I in FIG. Figure 3 for Figure 2 The enlarged schematic diagram of part II in FIG. In the figure: 1. Lower valve cover 2. Valve body 3. Channel end cover 4. Gate 5. Bolt 6. Nut 7. Valve stem 8. Valve cover 9. Packing 10. Packing pressure plate 11. Bracket 12. Bolt 13. Nut 14. Dust-proof graphite rope 15. Gasket 16. Butterfly spring seat ring 17. Sealing ring 18. Valve seat 19. Elastic retaining ring for shaft 20. Retaining ring 21. Butterfly spring 22. Pin shaft. DETAILED DESCRIPTION

[0009] The present invention will be further described in detail below with reference to the accompanying drawings.

[0010] Reference Figure 1 , Figure 2 An improved large-caliber flat gate valve with a guide hole comprises a valve body, and channel end covers 3 are installed at both ends of the valve body 2 to form an integral valve body; a butterfly spring seat ring 16 is arranged between the channel end cover 3 and the valve body 2; a plurality of butterfly spring assemblies are arranged in the butterfly spring seat ring 16; the butterfly spring seat ring 16 comprises a main body and protrusions extending out of the main body on the upper and lower end surfaces of the main body, and the outer wall of the upper protrusion is sealed and connected to the inner wall of the channel end cover 3 through a dustproof graphite rope 14 to prevent impurities in the medium from entering the butterfly spring assembly; the end face of the lower protrusion is sealed and connected to the valve seat 18 through a sealing ring 17 to ensure radial sealing between the valve seat 18 and the channel of the valve body 2; the end face of the channel end cover 3 is connected to the valve body 2 through a gasket 15 to ensure the strength sealing between the channel end cover 3 and the valve body 2.

[0011] Several circular holes are designed in an annular distribution on the butterfly spring seat ring 16, and the hole diameter is the same as the outer diameter of the retaining ring 20 and the large end diameter of the pin shaft 22, and the positive tolerance is maintained, and the butterfly spring assembly is installed in the hole.

[0012] Reference Figure 3 The butterfly spring assembly includes a butterfly spring 21, a retaining ring 20, a pin shaft 22, and an elastic retaining ring 19 for the shaft; the small end of the pin shaft 22 is sequentially mounted with the butterfly spring 21 and the retaining ring 20, and then the three are connected as a whole with the elastic retaining ring 19 for the shaft, which is convenient for installation.

[0013] The principle of the present invention is that when the channel end cover 3 is fastened to the valve body 2 by bolts 12 and nuts 13, the compression gasket 15 ensures the strength seal between the channel end cover 3 and the valve body 2, and also compresses the butterfly spring 21 so that the valve seat 18 and the sealing surface of the gate 4 have a certain sealing pressure ratio. When the valve is working at high temperature, the gate 4, valve seat 18, butterfly spring seat ring 16 and other components will expand due to heat, so that the butterfly spring 21 is compressed and deformed to compensate for the expansion, eliminating the damage to the sealing surface caused by the increase of sealing pressure ratio due to expansion.

[0014] The valve body 2 is provided with channel end covers 3 at both ends. When the butterfly spring assembly, the sealing ring 17 and the valve seat 18 need to be repaired, it is not necessary to remove the bolts 5 and nuts 6, open the valve cover 8, take out the valve stem 7 and the gate 4, just The butterfly spring assembly, the sealing ring 17 and the valve seat 18 can be repaired by removing the bolts 12 and the nuts 13 and taking off the channel end cover 3.

Claims

1. An improved large-diameter flat gate valve with a guide hole, comprising a valve body, characterized in that: The valve body (2) is provided with channel end covers (3) at both ends to form an integral valve body; a butterfly spring seat ring (16) is provided between the channel end cover (3) and the valve body (2); a plurality of butterfly spring assemblies are provided in the butterfly spring seat ring (16); the butterfly spring seat ring (16) comprises a main body and protrusions extending out of the main body at the upper and lower end surfaces of the main body; the outer wall of the upper protrusion is sealedly connected to the inner wall of the channel end cover (3) via a dustproof graphite rope (14), and the end surface of the lower protrusion is sealedly connected to the valve seat (18) via a sealing ring (17); the end surface of the channel end cover (3) is connected to the valve body (2) via a gasket (15).

2. An improved large-diameter flat gate valve with diversion holes according to claim 1, characterized in that: The butterfly spring assembly comprises a butterfly spring (21), a retaining ring (20), a pin shaft (22), and a shaft elastic retaining ring (19); the small end of the pin shaft (22) is sequentially sleeved with the butterfly spring (21) and the retaining ring (20), and then the three are connected as one with the shaft elastic retaining ring (19).

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