Steam turbine independent control high-pressure main steam regulating valve

Abstract

The invention relates to a steam turbine independent control high-pressure main steam regulating valve. The steam turbine independent control high-pressure main steam regulating valve comprises a valve body, wherein a valve A, a valve B and a valve C which are transversely arranged and are parallel to one another are mounted on the valve body, and the three valves have the same structure; the valve body is provided with a steam inlet, three guide holes for mounting the valves are formed in the upper side, corresponding to the steam inlet, of the valve body, and three steam outlet holes coaxially opposite to the guide holes are formed in the lower side, corresponding to the steam inlet, of the valve body; each valve comprises a guide valve sleeve, a valve rod and a valve seat, the guide valve sleeve is mounted in each guide hole, the valve rod is arranged in a central through hole of each guide valve sleeve in a penetrating manner, the valve tail of the valve rod extends upwards out ofeach guide valve sleeve and is connected with a hydraulic motor through a coupler, the valve head of the valve rod is assembled at the lower part of each guide valve sleeve and is matched with the hydraulic motor to enter and exit each guide valve sleeve, and the valve seat is correspondingly arranged below each valve head and is fixed at each steam outlet hole. According to the steam turbine independent control high-pressure main steam regulating valve provided by the invention, the function of coordinating steam flow is realized through the design of combined steam valves which are independent from one another and can work in a combined manner.

Description

technical field [0001] The invention relates to the technical field of steam turbine valve equipment, in particular to a steam turbine independent control high-pressure main steam regulating valve. Background technique [0002] The steam turbine is the main equipment of the thermal power plant. The steam intake and exhaust of the steam turbine are realized through the cooperation of various valves. The high-pressure main steam regulating valve is a valve to adjust the flow of the main steam. Generally, it is installed at the back end of the main steam valve, and the number of installations is 4. They are distributed and symmetrically installed on both sides of the steam turbine, and the steam entering the high-pressure cylinder to do work is adjusted separately. Each high-pressure main steam regulating valve is provided with its own oil motor, valve body, valve stem and valve seat. The existing conventional high-pressure main steam regulating valve has the following problem...

AI Technical Summary

Problems solved by technology

The valve sleeve structure is a long structure, and the inner hole is sprayed with Stellite alloy treatment or nitriding treatment to slide with the valve stem. Due to the long valve stem, the sprayed coating falls off after long-term operation, the straightness is out of tolerance, the scale is serious, and the valve is stuck. Hysteresis is frequent

[0005] 3. During the operation of the steam turbine unit, the valve stem and the valve head are required not to rotate relative to the valve seat. Usually, in the design structure of the high-pressure main steam regulating valve, the valve stem and the valve head are two parts, and the valve stem and the valve head are set between the valve stem and the valve head. The anti-rotation key and positioning pin realize the anti-rotation and connection and fixing functions respectively, but the structure design is complicated, and the connection position is seriously oxidized after long-term operation, which makes disassembly and maintenance difficult

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