High-pressure main steam valve of steam turbine

Abstract

The invention relates to a high-pressure main steam valve of a steam turbine. The high-pressure main steam valve of the steam turbine comprises a valve body, a valve cover, a filter screen assembly, amain steam valve disc and a valve rod, the valve body is provided with a steam inlet, the filter screen assembly is arranged in the valve body corresponding to the steam inlet, the valve cover fixedly connected with the valve body is arranged at one end of the filter screen assembly, a valve sleeve is arranged in the valve body at the other end of the filter screen assembly, a valve rod penetrates through the valve sleeve, a valve head of the valve rod extends into the steam inlet side and is provided with the main steam valve disc, a main steam valve seat for limiting is arranged in the valve body corresponding to the steam outlet side of the main steam valve disc, the valve body on the steam outlet side of the main steam valve seat is provided with a steam outlet and a water drain opening, and the valve tail of the valve rod extends out of the valve sleeve and is connected with an oil motor through a coupler. The invention provides the high-pressure main steam valve of the steam turbine, through the design of main parts with ingenious structures, the valve not only meets the reciprocating movement function, but also realizes the pre-starting switch function through movement matching , and the stability is high.

Description

technical field [0001] The invention relates to the technical field of steam turbine valve equipment, in particular to a high-pressure main steam valve of a steam turbine. Background technique [0002] A steam turbine is a rotary prime mover that converts heat energy into mechanical energy with steam as a working medium, and is mainly used to drive a generator to produce electrical energy. The steam intake and exhaust of the steam turbine are mainly realized through the cooperation of various valves, among which the high-pressure main steam valve is a valve that allows the main steam to enter the steam turbine and can be quickly closed. The high-pressure main steam valve currently on the market is mainly composed of oil motor, valve body, main valve disc, pre-opening valve disc, valve stem and bushing. The bushing is fixed in the valve body, and the valve stem slides in the bushing hole. [0003] The existing main steam valve is designed and installed with a filter screen f...

AI Technical Summary

Problems solved by technology

The valve disc is often switched on and off, and the temperature inside the valve body is high. After long-term operation, the sliding mating surface is seriously oxidized, and jamming often occurs, resulting in the failure of the pre-opening valve action. It is necessary to stop the machine regularly to remove the scale and restore the original design. gap, increased workload

Images