Plant stainless steel gate valve stainless steel gate valve distribution analysis of the causes of the leakage in the nuclear power plant control system of each circuit, play a very important role on the safety of nuclear power plant. At present, nuclear power plants use valve, ball valve, butterfly valve, cut-off valve, diaphragm valve and check valve valve base implementation localization, leakage prevention measures is more perfect. Gate diameter is larger, mainly used in the primary loop reactor system, the chemical and volume control system, safety injection system and the containment spray system, and other important system, most of the working medium is radioactive liquid, plays an indispensable role in nuclear power plants. Stainless steel gate is a kind of truncation, the movement direction of the opening and closing a gate, perpendicular to the direction of flow gate valves can only be fully open and close, not to adjust and throttling. A gate structure is relatively complex, generally by the valve body, valve cover, disc, seat, stem and packing, stud, nuts, washers and stop of the corresponding actuator. Plant stainless steel gate: analysis of the causes of the leakage of valve sealing parts mainly include the packing and the valve stem and cooperate with the stuffing box and the flange in the connection of the body and bonnet, mainly involves areas include valve body, valve cover, flange connection position and the Industrial Valves stem seal. The valve leakage, in which medium from leaking to the outside of the valve from the valve. Nuclear grade valve leakage occurs, the means have radioactive medium, which will be released into the environment, which is not allowed by the plant design. In nuclear power plant safety prevention, therefore, should as far as possible in the design of equipment to avoid the possibility of radioactive medium external leakage. The body is the main reason for the leakage Industrial Valves casting or forging defects in the production process, such as sand holes, porosity and crack, etc. In the process of design and production, mainly through selecting material and improve material inspection body leakage prevention. Plant material that is commonly used in the valve body material has a regulation, such as stainless steel castings, forgings, carbon steel castings, etc. Casting material can be chosen, but as a result of the casting defects in the process of production is more, some tiny cracks may happen during the operation of the plant creep deformation, etc. Forging body eliminates the internal defects, crack, and has better resistance to stress and intergranular corrosion resistant properties, material of intergranular uniform structure, high reliability. In the design of the plant, high temperature and high pressure gate valves should be chosen forging body. Used in nuclear power plant gate valve material needs through the use of advanced equipment and scientific methods for testing and found that the body and cover on the pressure components such as minor defects. At present, the test means for materials for radiographic testing, ultrasonic testing and liquid penetrant test, etc. , and with the inspection certificate of quality of personnel to operate. In the process of inspection, to examines the stainless steel Industrial Valves materials, rather than with the method of sampling. Stainless steel gate valve stem and valve cover seal packing need to calculate and determine the compaction force. Clamping force is too large or too small can't meet the requirements. When designing the valve stem seal structure should be reasonable packing layer, packing pressure and packing size, and the process of the scope of the size tolerance given strict and documented in the process of machining and be strictly implemented. Choose when packing, should not only consider the operating temperature, consider packing friction on the impact of the control process, medium radioactive impact on life of packing, etc. , and choose to meet the requirements of the nuclear power have aptitude and after test of special packing materials. Due to packing wear and heat loss, will appear the phenomenon of stress relaxation, the spring load is an effective method to compensate for the stress relaxation, such as the load on the packing gland disc spring. Can by disc spring, adjust the degree of compaction of filler, compensate the deformation of the packing, thus improve the packing seal self-adjusting ability, improve the sealing performance.
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