Steam turbine steam extraction regulation valve

Abstract

The invention discloses a turbine extraction control valve which is provided with a plurality of valves connected in parallel, the valve body is a cylinder body of the turbine; the valve core is a disk valve core and comprises a valve disc and a disc set, the valve disc is connected with a valve rod, the disc set is in fixed connection with a valve cover, the valve disc is covered in the disc setand in longitudinal slide fit with the same; the valve disc is provided with a balance cavity which is communicated with a steam outlet cavity through a balance hole, the top surface of the valve discforms an upper pressure bearing surface, the bottom surface of the valve disc forms a lower pressure bearing surface, a circular boss is arranged on the peripheral surface of the lower end of the valve disc, which makes the pressure bearing area of the upper pressure bearing surface and the lower pressure bearing surface meet the relation formula: S1 / S2 is approximated to 0.78; a valve cover is asharing valve cover of the whole structure. The turbine extraction control valve has the advantages that: a valve core has self-balancing function, has no need to assemble a pre-start valve, simplifying the structure, reducing the size, weight greatly and so does the cost and also improving the flow regulation performances; the sharing valve is convenient to assemble and disassemble and can shorten the time for installation and maintenance.

Description

technical field [0001] The invention relates to a steam turbine regulating valve, in particular to a steam turbine extraction regulating valve. Background technique [0002] The steam turbine needs to provide steam for other users of the heating network while satisfying power generation. Usually, a steam extraction device needs to be added to the steam turbine to extract the steam. When extracting steam, it is necessary to dynamically regulate the steam parameters, so a regulating valve is provided. The valve is a valve group composed of multiple parallel regulating valves, which is the same structure as the cylinder, that is, the cylinder body of the cylinder is used as the valve body, the valve cover is directly connected with the cylinder body, and other parts of the valve are arranged in the valve cover. Compared with the regulating valve designed in the past, there are the following problems: [0003] (1) The unloading degree of the valve is 100% unloading, and the ad...

AI Technical Summary

Problems solved by technology

[0003] (1) The unloading degree of the valve is 100% unloading, and the adjustment stability is poor;

[0004] (2) For industrial steam extraction control valves, the traditional design generally adopts pre-opening valve unloading, which makes the valve structure complex, and the pre-opening valve itself is easy to jam and damage

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