Special check valve of safety level 3 for passive medium-pressure safety injection system

Abstract

The invention discloses a special check valve of the safety level 3 for a passive medium-pressure safety injection system. The check valve comprises a first valve body, a second valve body, a flow guide cover assembly, a spring, an adjusting screw, a locking nut, a spherical valve core and a valve rod, wherein the first valve body and the second valve body are welded, the spherical valve core is connected to the valve rod, the valve rod extends into the flow guide cover assembly, the rear end of the valve rod is connected to the adjusting screw and is provided with a spring in a sleeved mode, and the locking nut is arranged at the part, located at the rear end of the spring, of the adjusting screw in a rotated mode. All the movement parts are shielded in the first valve body and the second valve body, and therefore the check valve is protected against leakage. The check valve is of an axial flow structure in overall and is compact in structure, small in size, light in weight, flexible and reliable in movement and small in flow resistance. The flexible connection technology of a valve core assembly is adopted, and therefore the reliability of the special check valve is improved, and the sealing performance is improved. The streamline channel technology is adopted, and therefore the flow resistance of the valve is reduced, and the flow capacity is improved. The spherical sealing technology is adopted, and therefore reliable sealing can be guaranteed on any conditions.

Description

technical field [0001] The invention relates to safety protection technology in high-temperature and high-pressure systems such as nuclear power, petrochemical, and metallurgy, and in particular relates to a three-level safety special check valve for passive medium-pressure safety injection systems. Background technique [0002] The safety level 3 special check valve plays a very important role in the passive medium pressure safety injection system, and is used in the pipeline between the reactor coolant system and the medium pressure safety injection system. [0003] When the pipeline system is in normal operation, the valve is cut off, and it is required to have high sealing performance to reduce the impact of reactor coolant leakage on the passive medium pressure safety injection system. [0004] When a loss of water accident occurs in the piping system, when the pressure of the reactor coolant system drops below the pressure of the safety injection tank, the check valve ...

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Problems solved by technology

[0007] In the past, no matter in terms of product structure, or in terms of material selection and application, it was impossible to guarantee the long-term continuous use of products under the above-mentioned high-temperature and high-pressure system conditions and high-humidity, high-heat, and high-radiation environmental conditions, especially high-temperature and high-pressure conditions. The tightness between the inner parts of the lower valve and the sealing performance under continuous operating conditions, so this field has been monopolized by foreign countries

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