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] This utility model belongs to the field of valve manufacturing technology, specifically relating to an improved large-diameter flat gate valve with guide holes. Background Technology

[0002] Flat gate valves are widely used in industries such as oil refining, chemical engineering, coal gasification, natural gas production, and liquefied petroleum gas (LPG). In the design of flat gate valves, a spring is installed at the rear of the valve seat. This serves two purposes: firstly, to maintain the pre-tightening pressure of the valve's sealing surface, and secondly, 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, while large-diameter (DN>100) flat gate valves use multiple cylindrical helical 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. The cylindrical helical spring has low vibration damping performance, is too tall, occupies a lot of space, and increases the size of the valve. Furthermore, when any flat gate valve has a fault in the valve seat and needs to be repaired, the valve cavity must be opened, the valve stem and gate must be removed first, and then the valve seat and other components must be removed before repair can be carried out. Utility Model Content

[0004] This utility model provides an improved large-diameter flat gate valve with a flow guide hole, which can be maintained online and has a small valve size.

[0005] The technical solution adopted in this utility model is as follows:

[0006] An improved large-diameter flat gate valve with a flow guide hole includes a valve body, with channel end caps installed at both ends to form an integral valve body; a butterfly spring seat is provided between the channel end caps and the valve body; the butterfly spring seat contains a plurality of butterfly spring assemblies; the butterfly spring seat includes a main body and protrusions extending from the upper and lower end faces of the main body; the outer wall of the upper protrusion is sealed to the inner wall of the channel end cap by a dustproof graphite rope, and the end face of the lower protrusion is sealed to the valve seat by a sealing ring; the end face of the channel end cap is connected to the valve body by a gasket.

[0007] The butterfly spring assembly includes a butterfly spring, a retaining ring, a pin, and a shaft elastic retaining ring; the small end of the pin is fitted with the butterfly spring and the retaining ring in sequence, and then the three are connected as one unit by the shaft elastic retaining ring.

[0008] This utility model features multiple sets of small butterfly spring assemblies at the rear of the valve seat, fully utilizing the advantages of butterfly springs such as small deformation, high load-bearing capacity, strong shock absorption, easy procurement, and space saving. Secondly, channel end caps are installed at both ends of the valve body, so that when a fault occurs in the valve seat and maintenance is required, the valve seat assembly can be repaired online without opening the valve cavity, which is convenient and quick. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0010] Figure 2 for Figure 1 Enlarged schematic diagram of Part I;

[0011] Figure 3 for Figure 2 Enlarged schematic diagram of Part II;

[0012] In the diagram: 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. Dustproof graphite rope 15. Gasket 16. Butterfly spring seat 17. Sealing ring 18. Valve seat 19. Shaft elastic retaining ring 20. Retaining ring 21. Butterfly spring 22. Pin. Detailed Implementation

[0013] The present invention will now be described in further detail with reference to the accompanying drawings.

[0014] Reference Figure 1 , Figure 2 An improved large-diameter flat gate valve with a flow guide hole includes a valve body 2, with channel end caps 3 installed at both ends to form an integral valve body; a butterfly spring seat ring 16 is provided between the channel end caps 3 and the valve body 2; the butterfly spring seat ring 16 contains a plurality of butterfly spring assemblies; the butterfly spring seat ring 16 includes a main body and protrusions extending from the upper and lower end faces of the main body; the outer wall of the upper protrusion is sealed to the inner wall of the channel end cap 3 by 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 to the valve seat 18 by 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 cap 3 is connected to the valve body 2 by a gasket 15 to ensure a strong seal between the channel end cap 3 and the valve body 2.

[0015] Several circular holes are designed in a ring on the disc spring seat 16. The diameter of the holes is the same as the outer diameter of the retaining ring 20 and the large end diameter of the pin 22, and positive tolerance is maintained. The disc spring assembly is then installed into the holes.

[0016] Reference Figure 3 The butterfly spring assembly includes a butterfly spring 21, a retaining ring 20, a pin 22, and a shaft elastic retaining ring 19. The small end of the pin 22 is fitted with the butterfly spring 21 and the retaining ring 20 in sequence, and then the three are connected into one body by the shaft elastic retaining ring 19 for easy installation.

[0017] The principle of this invention is as follows: When the channel end cover 3 is fastened to the valve body 2 by bolts 12 and nuts 13, the compression gasket 15 ensures a strong seal between the channel end cover 3 and the valve body 2, while simultaneously compressing the butterfly spring 21 to create a certain sealing pressure between the valve seat 18 and the sealing surface of the gate 4. When the valve operates at high temperatures, components such as the gate 4, valve seat 18, and butterfly spring seat 16 undergo thermal expansion, causing the butterfly spring 21 to deform under pressure and compensate for the expansion, thus eliminating damage to the sealing surface caused by increased sealing pressure due to expansion.

[0018] The valve body 2 has end caps 3 at both ends. When the butterfly spring assembly, sealing ring 17, and valve seat 18 need maintenance, it is not necessary to remove the bolts 5 and nuts 6, open the valve cover 8, or take out the valve stem 7 and gate 4.

[0019] By removing bolt 12, nut 13, and channel end cap 3, the butterfly spring assembly, sealing ring 17, and valve seat 18 can be repaired.

Claims

1. An improved large-diameter flat gate valve with a flow guide orifice, comprising a valve body, characterized in that, The valve body (2) is assembled into an integral valve body by installing channel end caps (3) at both ends; a butterfly spring seat (16) is provided between the channel end cap (3) and the valve body (2); the butterfly spring seat (16) is provided with several butterfly spring assemblies; the butterfly spring seat (16) includes a main body and protrusions extending from the upper and lower end faces of the main body. The outer wall of the upper protrusion is sealed to the inner wall of the channel end cap (3) by a dustproof graphite rope (14), and the end face of the lower protrusion is sealed to the valve seat (18) by a sealing ring (17); the end face of the channel end cap (3) is connected to the valve body (2) by a gasket (15).

2. An improved large-diameter flat gate valve with guide holes according to claim 1, characterized in that, The butterfly spring assembly includes a butterfly spring (21), a retaining ring (20), a pin (22), and a shaft elastic retaining ring (19); the small end of the pin (22) is fitted with the butterfly spring (21) and the retaining ring (20) in sequence, and then the three are connected together by the shaft elastic retaining ring (19).

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