High-pressure-resistant self-sealing main throttle valve

Abstract

The invention discloses a high-pressure-resistant self-sealing main throttle valve. The high-pressure-resistant self-sealing main throttle valve comprises a main throttle valve body, the main throttlevalve body is provided with a valve casing, a main valve seat is arranged in one side of the valve casing, and a main valve disc is installed in the main valve seat. A pilot valve is installed on themiddle portion of one end of the main valve disc, a pilot valve bush is installed on the outer side of one end of the pilot valve, and a main valve stem is installed in the other end of the pilot valve bush. A valve core and a pilot valve disc are installed at one end of the main valve stem, the valve core is located in the pilot valve disc, a sealing ring is installed on the outer side of one end of the main valve stem, and one end of the sealing ring is connected with the side end of the pilot valve disc. The high-pressure-resistant self-sealing main throttle valve has the beneficial effects that the main valve stem is pressed through the main valve stem, the sealing ring and the differential pressure inside and outside the main throttle valve, so that the sealing ring at one end is extruded, as the sealing ring is made of graphite, the movement of the main valve stem is not affected due to low friction on the main valve stem, the steam leakage of the main throttle valve is reduced,and the unit efficiency and operation safety are improved.

Description

technical field [0001] The invention relates to a high-pressure-resistant self-sealing main valve, belonging to the technical field of main valve. Background technique [0002] A steam turbine is a rotary power machine that converts the energy of steam into mechanical work, also known as a steam turbine. It is mainly used as the prime mover for power generation, and can also directly drive various pumps, fans, compressors and ship propellers. It has the advantages of high power, high efficiency and long life. In a steam turbine, the function of the high-pressure main valve is to urgently block the steam intake when needed; when the steam turbine unit is started, the high-pressure main valve has the function of adjusting the speed. The conventional main valve relies on the sealing ring and multi-stage pressure relief (usually the first stage of leakage is connected to the deaerator, and the second-stage leakage is connected to the shaft seal heater) to reduce the steam leak...

AI Technical Summary

Problems solved by technology

Conventional main steam valves rely on sealing rings and multi-stage pressure relief (usually one stage of leakage steam is connected to deaerator, and the second stage of leakage gas is connected to shaft seal heater) to reduce the leakage of main valve steam, and this part of the leaked steam is not used to do work Power generation, a serious waste of resources, reducing the efficiency and safety of unit operation

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