High temperature gas-cooled reactor main steam isolation valve

Abstract

A main steam isolation valve of a high-temperature gas cooled reactor comprises a valve body, a valve seat, a valve deck, a valve rod motion assembly, a support and an electric device. The valve rod motion assembly comprises a left gate plate, a right gate plate, a holder, a center ejecting ball, a gate plate fork and a valve rod; the valve seat is arranged in the valve body, the valve deck is arranged on the valve body, and the holder is located inside the valve body; the electric device is connected with the valve deck through the support, and is connected with the valve rod, and the lower end of the valve rod is connected with the upper portion of the holder; the upper portion of the holder is connected with the gate plate fork, and the left gate plate and the right gate plate are arranged between the gate plate fork and the lower portion of the holder; the center ejecting ball supports the left gate plate and the right gate plate, and is in spherical contact with the left gate plate and the right gate plate; and the left gate plate and the right gate plate are in spherical contact with the holder. A spherical contact adjustable wedge type double-gate-plate structure is adopted by the valve, and the structure can ensure that deformation generated by temperature and deformation, caused by pipe end loads, of the isolation valve can be compensated for under the high temperature.

Description

technical field [0001] The invention relates to a main steam isolation valve of a high-temperature gas-cooled reactor, which belongs to the field of valves for nuclear power, thermal power and the like. Background technique [0002] The high-temperature gas-cooled reactor is a type of reactor with good safety characteristics recognized by the international nuclear energy community, and it is one of the fourth-generation nuclear energy system technologies. When a tube failure accident occurs in the heat transfer tube of the steam generator, it is necessary to quickly shut off the main steam isolation valve to cut off the main steam pipeline, so as to ensure the safety of the reactor. The operating parameters of the high temperature gas-cooled reactor (design temperature is 576°C, design pressure is 15.7MPa, the medium is superheated steam) than the parameters of the pressurized water reactor nuclear power plant (design temperature is 300°C, design pressure is 8.6MPa, the medi...

Images