Device for grinding sealing face of valve seat of high temperature and high pressure valve

Abstract

The invention relates to a sealing face grinding device for a valve seat of a high-temperature and high-pressure valve, which comprises a grinding rod, a main support positioning disk, a mounting seat and a grinding block, and is characterized in that the mounting seat the outer peripheral face of which has taper is connected to the grinding rod through a connecting piece; a plurality of grinding blocks are combined and arranged at the periphery of the mounting seat, the upper end and the lower end of the combined grinding blocks are conical surfaces, the outer peripheral surface of the grinding block is a curved surface and is fixed by an upper compaction disk and a lower compaction disk with matched conical surfaces; and the grinding rod is movably sleeved with the connecting piece which is connected with the main support positioning disk, four orientations of the main support positioning disk are connected with supporting plates through bolts, and the outer edges of the supporting plates are fixed and assembled on a flange mouth of the valve through compaction blocks. The sealing face grinding device has the advantages that a main bearing part can be adjusted, the grinding face of a grinding head can be adjusted according to requirements, the grinding block can be replaced quickly, and the sealing face grinding device can shorten the grinding period remarkably and is suitable for the technical requirement of quick maintenance for a power plant.

Description

technical field [0001] The invention belongs to a valve seat sealing surface grinding device for high-temperature and high-pressure valves, in particular to a valve seat sealing surface grinding device for overhauling and grinding the valve seat sealing surfaces of various valves in high-temperature and high-pressure pipelines of steam turbines in power plants. Background technique [0002] For all kinds of valves (especially high temperature and high pressure valves) in the steam turbine system and boiler system of the power plant, after a certain service period, the valve seat sealing surface of the valve will leak due to wear and erosion, and the valve seat sealing surface needs to be repaired. Inspection and grinding, the current problems are: (1) Since the flange size of the valve ranges from about φ100 to about φ1500, each diameter of the positioning plate installed on the flange used in the inspection and grinding device is Therefore, a large number of positioning dis...

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Problems solved by technology

[0002] For all kinds of valves (especially high temperature and high pressure valves) in the steam turbine system and boiler system of the power plant, after a certain service period, the valve seat sealing surface of the valve will leak due to wear and erosion, and the valve seat sealing surface needs to be repaired. Inspection and grinding, the current problems are: (1) Since the flange size of the valve ranges from about φ100 to about φ1500, each diameter of the positioning plate installed on the flange used in the inspection and grinding device is Therefore, a large number of positioning discs of various diameters are required for the maintenance and grinding of valves. At the same time, the maintenance and grinding time of power plants is generally a short few days. It is difficult, and it also brings difficulties to manufacturing and transportation.

(2) The grinding head used for maintenance and grinding has a one-to-one correspondence with the sealing surfaces of valve seats of different diameter models, and the diameter cannot be adjusted on site according to the needs of use.

As a result, the grinding period is long, so it cannot meet the technical requirements for quick maintenance of power plants

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