Self-operated pressure reducing valve seat disassembling and assembling tool and method

Abstract

The invention belongs to the technical field of valve installation and maintenance and particularly relates to a self-operated pressure reducing valve seat disassembling and assembling tool and method. The tool comprises a clamping device, a bearing and a pressing device, wherein the clamping device is sleeved with the bearing, the pressing device presses above the bearing, and two ends of the pressing device are each provided with a through hole used for fixing the pressing device to a valve body through bolts. A tool only provided with a clamping jaw structure is used for fastening a valve seat, due to the fact that a valve seat groove is shallow, the tool is not axially positioned in the fastening process, and the tool can easily slip and disengage from the valve seat groove. When the tool is used, axial positioning of the clamping device can be achieved through the pressing device, a protruding part at the top of the clamping device is prevented from sliding out of the valve seat groove, friction between the clamping device and the pressing device can be reduced through a thrust bearing, the clamping device can be connected with a torque wrench, the tightening torque of the valve seat is quantitatively controlled, and thereby sealing between the valve seat and the valve body is guaranteed. The valve seat cannot be damaged, the tightening torque of the valve seat can be ensured, and operation convenience can be improved.

Description

technical field [0001] The invention belongs to the technical field of valve installation and maintenance, and in particular relates to a tool and method for disassembling and disassembling a valve seat of a self-operated pressure reducing valve. Background technique [0002] Self-operated pressure reducing valves in nuclear power plants are generally used in gaseous medium systems, such as nitrogen systems, compressed air systems, etc., to reduce the valve outlet medium to the pressure value required by the system. [0003] The sealing performance of the self-operated pressure reducing valve plays a decisive role in the realization of the valve function. The sealing parts of the valve are divided into: the seal between the valve disc and the valve seat, the seal between the valve seat and the valve body, and the seal between the valve stem and the packing. [0004] Among them, the sealing performance between the valve seat and the valve body is the most difficult to guaran...

AI Technical Summary

Problems solved by technology

[0005] The reason is that the valve seat and the valve body of the self-operated pressure reducing valve are connected by threads, and a sealing gasket is installed between the valve seat and the valve body, but it is difficult to ensure the effective sealing of the gasket through the method of quantitative torque tightening

[0006] Because the valve seat is installed in the valve cavity, and the shape of the valve seat is irregular, it is impossible to use a torque wrench to tighten the valve seat by conventional bolt fastening methods

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