Assembly and disassembly tools and inspection and disassembly process of sealing components of isolation valve body

Abstract

The invention relates to a disassembling and assembling tool of an isolating valve body sealing assembly and an overhaul disassembling and assembling process. A supporting part is matched with a valve body, a lifting lead screw and a valve deck are connected, and the valve deck is evenly lifted under rotation action of a fastening nut until the valve deck is separated from the valve body. The disassembling and assembling tool of the isolating valve body sealing assembly and the overhaul disassembling and assembling process can ensure rapidness and convenience of the overhaul disassembling and assembling process, parts can be well protected in the process and prevented from being damaged, assembling consistency before and after disassembly and assembly is ensured, the disassembling and assembling efficiency is improved, the overhaul risk is reduced, and the overhaul cost is saved.

Description

technical field [0001] The invention relates to the inspection and maintenance of an isolation valve, and more specifically, to a disassembly tool and a maintenance and disassembly process for a sealing assembly of a valve body of an isolation valve. Background technique [0002] like figure 1 As shown, in the valve body assembly of the main steam isolation valve of a nuclear power plant, the valve cover sealing surface 613 on the valve body 61 is in contact with the pressure sealing ring 65 at the valve cover 62 to form a reverse seal to ensure that the steam does not leak. All sealing components on the valve body 61 shall be disassembled, including the bonnet 62, packing chamber, spring chamber, spacer ring 66, sealing ring 65, valve stem 67, sealing gate 63, spacer ring, three-in-one retaining ring 64, etc. . Wherein, the bonnet 62 is matched with the bonnet sealing surface 613 on the valve body 61, and the spacer ring 66 and the sealing ring 65 are sleeved on the outer...

AI Technical Summary

Problems solved by technology

After the VVP gate is severely scratched, it cannot be repaired, and the gate can only be replaced, and the cost of directly replacing the spare parts of the gate is very high, and the maintenance cost is relatively high

After the valve seat sealing surface 611 on the valve body 61 is damaged, it can only be polished, and the hidden danger cannot be completely eliminated.

Moreover, the wedge-shaped double-gate valve has angle requirements, and it is difficult to ensure the angle by grinding, which will cause the sealing failure of the sealing gate 63, and the consequences will be serious.

The value of the valve body 61 is huge, and the replacement of the valve body 61 involves cutting and welding of the main steam pipeline, the process is complicated and the cost is unbearable

[0005] After the valve body assembly is removed, due to the negative pressure of the nuclear island, the air flow is poured from the secondary side into the nuclear island

The overhaul of other valves in the nuclear island has brought a lot of inconvenience and potential safety hazards, and each overhaul has different feedbacks

Moreover, the backflow of air flow will cause foreign matter to be introduced. When foreign matter is found during maintenance of other valves and equipment, it is often suspected that foreign matter is introduced.

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