Underground valve maintenance tool and maintenance method

Abstract

The invention provides an underground valve maintenance tool and method. The tool comprises a lifting jaw, a limiting sleeve, a lifting ring and a fixed plate. The lifting jaw is divided into three sections: a fixed connecting part, a sleeve part and a jaw connecting part; an internal thread hole is formed in the top surface center of the fixed connecting part; the radial and axial sizes of an inner cavity of the sleeve part are matched with a transmission rod of an underground valve; multiple limiting clamping bars are distributed in the peripheral direction of the limiting sleeve; the upperparts of the limiting clamping bars are connected as a whole, and the sizes and the positions are matched with plum blossom holes of a back pressing sleeve; the lifting ring is divided into a ring part and a rod part; an external thread matched with the internal thread hole of the fixed connecting part of the lifting jaw is arranged at the lower end of the rod part; the external thread is matchedwith an end screw hole of the transmission rod of the underground valve and an end screw hole of an operation rod; a strip hole is formed in the center direction of the fixed plate; and the closed endsize of the strip hole is matched with a front pressing sleeve of the underground valve. The maintenance tool is matched for use, facilitates maintainers to quickly maintain, and prevents long-time exposure in radioactive substance environments to improve the safety.

Description

technical field [0001] The invention belongs to the field of process pipeline inspection and maintenance, and in particular relates to an inspection tool and an inspection method for a ground-piercing valve. Background technique [0002] The ground penetrating valve is a special valve specially used in the spent fuel reprocessing system. Among them, the feeding method of the ground-piercing valve in the post-treatment process system is generally designed as "low in and high out". This feeding method will easily lead to the accumulation of material liquid in the low-end horizontal pipeline and block the pipeline. Since the flowing medium is a highly radioactive material, The pipeline is directly connected to the ground-piercing valve, so the spool of the ground-piercing valve is in a high radioactive area. [0003] The volume and weight of the valve are large, and it involves the isolation floor, so the disassembly and assembly link in the maintenance process is relatively c...

AI Technical Summary

Problems solved by technology

Among them, the feeding method of the ground-piercing valve in the post-treatment process system is generally designed as "low in and high out". This feeding method will easily lead to the accumulation of material liquid in the low-end horizontal pipeline and block the pipeline. Since the flowing medium is highly radioactive material, The pipeline is directly connected to the ground-piercing valve, so the spool of the ground-piercing valve is in a high radioactive area

[0003] The valve is large in size and weight, and involves the isolation floor, so the disassembly and assembly link in the maintenance process is relatively complicated. At this stage, there is no special maintenance tool suitable for the ground-piercing valve, which makes the maintenance of the valve difficult.

Images